src/richtext/richtextctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/richtext/richeditctrl.cpp
   3 // Purpose:     A rich edit control
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     2005-09-30
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_RICHTEXT
  20
  21 #include "wx/richtext/richtextctrl.h"
  22 #include "wx/richtext/richtextstyles.h"
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/wx.h"
  26     #include "wx/settings.h"
  27 #endif
  28
  29 #include "wx/textfile.h"
  30 #include "wx/ffile.h"
  31 #include "wx/filename.h"
  32 #include "wx/dcbuffer.h"
  33 #include "wx/arrimpl.cpp"
  34 #include "wx/fontenum.h"
  35 #include "wx/accel.h"
  36
  37 // DLL options compatibility check:
  38 #include "wx/app.h"
  39 WX_CHECK_BUILD_OPTIONS("wxRichTextCtrl")
  40
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_CLICK)
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK)
  45 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RETURN)
  46 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CHARACTER)
  47 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_DELETE)
  48
  49 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_REPLACING)
  50 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_REPLACED)
  51 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_CHANGING)
  52 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_CHANGED)
  53
  54 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CONTENT_INSERTED)
  55 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CONTENT_DELETED)
  56 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLE_CHANGED)
  57 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_SELECTION_CHANGED)
  58 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_BUFFER_RESET)
  59
  60 #if wxRICHTEXT_USE_OWN_CARET
  61
  62 /*!
  63  * wxRichTextCaret
  64  *
  65  * This implements a non-flashing cursor in case there
  66  * are platform-specific problems with the generic caret.
  67  * wxRICHTEXT_USE_OWN_CARET is set in richtextbuffer.h.
  68  */
  69
  70 class wxRichTextCaret: public wxCaret
  71 {
  72 public:
  73     // ctors
  74     // -----
  75         // default - use Create()
  76     wxRichTextCaret() { Init(); }
  77         // creates a block caret associated with the given window
  78     wxRichTextCaret(wxRichTextCtrl *window, int width, int height)
  79         : wxCaret(window, width, height) { Init(); m_richTextCtrl = window; }
  80     wxRichTextCaret(wxRichTextCtrl *window, const wxSize& size)
  81         : wxCaret(window, size) { Init(); m_richTextCtrl = window; }
  82
  83     virtual ~wxRichTextCaret();
  84
  85     // implementation
  86     // --------------
  87
  88     // called by wxWindow (not using the event tables)
  89     virtual void OnSetFocus();
  90     virtual void OnKillFocus();
  91
  92     // draw the caret on the given DC
  93     void DoDraw(wxDC *dc);
  94
  95     // get the visible count
  96     int GetVisibleCount() const { return m_countVisible; }
  97
  98     // delay repositioning
  99     bool GetNeedsUpdate() const { return m_needsUpdate; }
 100     void SetNeedsUpdate(bool needsUpdate = true ) { m_needsUpdate = needsUpdate; }
 101
 102 protected:
 103     virtual void DoShow();
 104     virtual void DoHide();
 105     virtual void DoMove();
 106     virtual void DoSize();
 107
 108     // refresh the caret
 109     void Refresh();
 110
 111 private:
 112     void Init();
 113
 114     int           m_xOld,
 115                   m_yOld;
 116     bool          m_hasFocus;       // true => our window has focus
 117     bool          m_needsUpdate;    // must be repositioned
 118
 119     wxRichTextCtrl* m_richTextCtrl;
 120 };
 121 #endif
 122
 123 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
 124
 125 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
 126
 127 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
 128     EVT_PAINT(wxRichTextCtrl::OnPaint)
 129     EVT_ERASE_BACKGROUND(wxRichTextCtrl::OnEraseBackground)
 130     EVT_IDLE(wxRichTextCtrl::OnIdle)
 131     EVT_SCROLLWIN(wxRichTextCtrl::OnScroll)
 132     EVT_LEFT_DOWN(wxRichTextCtrl::OnLeftClick)
 133     EVT_MOTION(wxRichTextCtrl::OnMoveMouse)
 134     EVT_LEFT_UP(wxRichTextCtrl::OnLeftUp)
 135     EVT_RIGHT_DOWN(wxRichTextCtrl::OnRightClick)
 136     EVT_MIDDLE_DOWN(wxRichTextCtrl::OnMiddleClick)
 137     EVT_LEFT_DCLICK(wxRichTextCtrl::OnLeftDClick)
 138     EVT_CHAR(wxRichTextCtrl::OnChar)
 139     EVT_KEY_DOWN(wxRichTextCtrl::OnChar)
 140     EVT_SIZE(wxRichTextCtrl::OnSize)
 141     EVT_SET_FOCUS(wxRichTextCtrl::OnSetFocus)
 142     EVT_KILL_FOCUS(wxRichTextCtrl::OnKillFocus)
 143     EVT_MOUSE_CAPTURE_LOST(wxRichTextCtrl::OnCaptureLost)
 144     EVT_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
 145     EVT_SYS_COLOUR_CHANGED(wxRichTextCtrl::OnSysColourChanged)
 146
 147     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
 148     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
 149
 150     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
 151     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
 152
 153     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
 154     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
 155
 156     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
 157     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
 158
 159     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
 160     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
 161
 162     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
 163     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
 164
 165     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
 166     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
 167 END_EVENT_TABLE()
 168
 169 /*!
 170  * wxRichTextCtrl
 171  */
 172
 173 wxArrayString wxRichTextCtrl::sm_availableFontNames;
 174
 175 wxRichTextCtrl::wxRichTextCtrl()
 176               : wxScrollHelper(this)
 177 {
 178     Init();
 179 }
 180
 181 wxRichTextCtrl::wxRichTextCtrl(wxWindow* parent,
 182                                wxWindowID id,
 183                                const wxString& value,
 184                                const wxPoint& pos,
 185                                const wxSize& size,
 186                                long style,
 187                                const wxValidator& validator,
 188                                const wxString& name)
 189               : wxScrollHelper(this)
 190 {
 191     Init();
 192     Create(parent, id, value, pos, size, style, validator, name);
 193 }
 194
 195 /// Creation
 196 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style,
 197                              const wxValidator& validator, const wxString& name)
 198 {
 199     if (!wxControl::Create(parent, id, pos, size,
 200                            style|wxFULL_REPAINT_ON_RESIZE,
 201                            validator, name))
 202         return false;
 203
 204     if (!GetFont().Ok())
 205     {
 206         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 207     }
 208
 209     if (style & wxTE_READONLY)
 210         SetEditable(false);
 211
 212     // The base attributes must all have default values
 213     wxTextAttr attributes;
 214     attributes.SetFont(GetFont());
 215     attributes.SetTextColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
 216     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 217     attributes.SetLineSpacing(10);
 218     attributes.SetParagraphSpacingAfter(10);
 219     attributes.SetParagraphSpacingBefore(0);
 220
 221     SetBasicStyle(attributes);
 222
 223     // The default attributes will be merged with base attributes, so
 224     // can be empty to begin with
 225     wxTextAttr defaultAttributes;
 226     SetDefaultStyle(defaultAttributes);
 227
 228     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 229     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 230
 231     GetBuffer().Reset();
 232     GetBuffer().SetRichTextCtrl(this);
 233
 234 #if wxRICHTEXT_USE_OWN_CARET
 235     SetCaret(new wxRichTextCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16));
 236 #else
 237     SetCaret(new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16));
 238 #endif
 239
 240     // Tell the sizers to use the given or best size
 241     SetInitialSize(size);
 242
 243 #if wxRICHTEXT_BUFFERED_PAINTING
 244     // Create a buffer
 245     RecreateBuffer(size);
 246 #endif
 247
 248     m_textCursor = wxCursor(wxCURSOR_IBEAM);
 249     m_urlCursor = wxCursor(wxCURSOR_HAND);
 250
 251     SetCursor(m_textCursor);
 252
 253     if (!value.IsEmpty())
 254         SetValue(value);
 255
 256     GetBuffer().AddEventHandler(this);
 257
 258     // Accelerators
 259     wxAcceleratorEntry entries[4];
 260
 261     entries[0].Set(wxACCEL_CMD,   (int) 'C',       wxID_COPY);
 262     entries[1].Set(wxACCEL_CMD,   (int) 'X',       wxID_CUT);
 263     entries[2].Set(wxACCEL_CMD,   (int) 'V',       wxID_PASTE);
 264     entries[3].Set(wxACCEL_CMD,   (int) 'A',       wxID_SELECTALL);
 265
 266     wxAcceleratorTable accel(4, entries);
 267     SetAcceleratorTable(accel);
 268
 269     return true;
 270 }
 271
 272 wxRichTextCtrl::~wxRichTextCtrl()
 273 {
 274     GetBuffer().RemoveEventHandler(this);
 275
 276     delete m_contextMenu;
 277 }
 278
 279 /// Member initialisation
 280 void wxRichTextCtrl::Init()
 281 {
 282     m_contextMenu = NULL;
 283     m_caret = NULL;
 284     m_caretPosition = -1;
 285     m_selectionRange.SetRange(-2, -2);
 286     m_selectionAnchor = -2;
 287     m_editable = true;
 288     m_caretAtLineStart = false;
 289     m_dragging = false;
 290     m_fullLayoutRequired = false;
 291     m_fullLayoutTime = 0;
 292     m_fullLayoutSavedPosition = 0;
 293     m_delayedLayoutThreshold = wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD;
 294     m_caretPositionForDefaultStyle = -2;
 295 }
 296
 297 void wxRichTextCtrl::DoThaw()
 298 {
 299     if (GetBuffer().GetDirty())
 300         LayoutContent();
 301     else
 302         SetupScrollbars();
 303
 304     wxWindow::DoThaw();
 305 }
 306
 307 /// Clear all text
 308 void wxRichTextCtrl::Clear()
 309 {
 310     m_buffer.ResetAndClearCommands();
 311     m_buffer.SetDirty(true);
 312     m_caretPosition = -1;
 313     m_caretPositionForDefaultStyle = -2;
 314     m_caretAtLineStart = false;
 315     m_selectionRange.SetRange(-2, -2);
 316
 317     Scroll(0,0);
 318
 319     if (!IsFrozen())
 320     {
 321         LayoutContent();
 322         Refresh(false);
 323     }
 324
 325     wxTextCtrl::SendTextUpdatedEvent(this);
 326 }
 327
 328 /// Painting
 329 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 330 {
 331 #if !wxRICHTEXT_USE_OWN_CARET
 332     if (GetCaret() && !IsFrozen())
 333         GetCaret()->Hide();
 334 #endif
 335
 336     {
 337 #if wxRICHTEXT_BUFFERED_PAINTING
 338         wxBufferedPaintDC dc(this, m_bufferBitmap);
 339 #else
 340         wxPaintDC dc(this);
 341 #endif
 342
 343         if (IsFrozen())
 344             return;
 345
 346         PrepareDC(dc);
 347
 348         dc.SetFont(GetFont());
 349
 350         // Paint the background
 351         PaintBackground(dc);
 352
 353         // wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 354
 355         wxRect drawingArea(GetUpdateRegion().GetBox());
 356         drawingArea.SetPosition(GetLogicalPoint(drawingArea.GetPosition()));
 357
 358         wxRect availableSpace(GetClientSize());
 359         if (GetBuffer().GetDirty())
 360         {
 361             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 362             GetBuffer().SetDirty(false);
 363             SetupScrollbars();
 364         }
 365
 366         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetInternalSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 367 #if wxRICHTEXT_USE_OWN_CARET
 368         if (GetCaret()->IsVisible())
 369         {
 370             ((wxRichTextCaret*) GetCaret())->DoDraw(& dc);
 371         }
 372 #endif
 373     }
 374
 375 #if !wxRICHTEXT_USE_OWN_CARET
 376     if (GetCaret())
 377         GetCaret()->Show();
 378     PositionCaret();
 379 #endif
 380 }
 381
 382 // Empty implementation, to prevent flicker
 383 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 384 {
 385 }
 386
 387 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 388 {
 389     if (GetCaret())
 390     {
 391 #if !wxRICHTEXT_USE_OWN_CARET
 392         PositionCaret();
 393 #endif
 394         GetCaret()->Show();
 395     }
 396
 397 #if defined(__WXGTK__) && !wxRICHTEXT_USE_OWN_CARET
 398     // Work around dropouts when control is focused
 399     if (!IsFrozen())
 400     {
 401         Refresh(false);
 402     }
 403 #endif
 404 }
 405
 406 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 407 {
 408     if (GetCaret())
 409         GetCaret()->Hide();
 410
 411 #if defined(__WXGTK__) && !wxRICHTEXT_USE_OWN_CARET
 412     // Work around dropouts when control is focused
 413     if (!IsFrozen())
 414     {
 415         Refresh(false);
 416     }
 417 #endif
 418 }
 419
 420 void wxRichTextCtrl::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
 421 {
 422     m_dragging = false;
 423 }
 424
 425 /// Left-click
 426 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 427 {
 428     SetFocus();
 429
 430     wxClientDC dc(this);
 431     PrepareDC(dc);
 432     dc.SetFont(GetFont());
 433
 434     long position = 0;
 435     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 436
 437     if (hit != wxRICHTEXT_HITTEST_NONE)
 438     {
 439         m_dragStart = event.GetLogicalPosition(dc);
 440         m_dragging = true;
 441         CaptureMouse();
 442
 443         bool caretAtLineStart = false;
 444
 445         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 446         {
 447             // If we're at the start of a line (but not first in para)
 448             // then we should keep the caret showing at the start of the line
 449             // by showing the m_caretAtLineStart flag.
 450             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 451             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 452
 453             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 454                 caretAtLineStart = true;
 455             position --;
 456         }
 457
 458         long oldCaretPos = m_caretPosition;
 459
 460         MoveCaret(position, caretAtLineStart);
 461         SetDefaultStyleToCursorStyle();
 462
 463         if (event.ShiftDown())
 464         {
 465             if (m_selectionRange.GetStart() == -2)
 466                 ExtendSelection(oldCaretPos, m_caretPosition, wxRICHTEXT_SHIFT_DOWN);
 467             else
 468                 ExtendSelection(m_caretPosition, m_caretPosition, wxRICHTEXT_SHIFT_DOWN);
 469         }
 470         else
 471             SelectNone();
 472     }
 473
 474     event.Skip();
 475 }
 476
 477 /// Left-up
 478 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& event)
 479 {
 480     if (m_dragging)
 481     {
 482         m_dragging = false;
 483         if (GetCapture() == this)
 484             ReleaseMouse();
 485
 486         // See if we clicked on a URL
 487         wxClientDC dc(this);
 488         PrepareDC(dc);
 489         dc.SetFont(GetFont());
 490
 491         long position = 0;
 492         wxPoint logicalPt = event.GetLogicalPosition(dc);
 493         int hit = GetBuffer().HitTest(dc, logicalPt, position);
 494
 495         if ((hit != wxRICHTEXT_HITTEST_NONE) && !(hit & wxRICHTEXT_HITTEST_OUTSIDE))
 496         {
 497             wxRichTextEvent cmdEvent(
 498                 wxEVT_COMMAND_RICHTEXT_LEFT_CLICK,
 499                 GetId());
 500             cmdEvent.SetEventObject(this);
 501             cmdEvent.SetPosition(m_caretPosition+1);
 502
 503             if (!GetEventHandler()->ProcessEvent(cmdEvent))
 504             {
 505                 wxTextAttr attr;
 506                 if (GetStyle(position, attr))
 507                 {
 508                     if (attr.HasFlag(wxTEXT_ATTR_URL))
 509                     {
 510                         wxString urlTarget = attr.GetURL();
 511                         if (!urlTarget.IsEmpty())
 512                         {
 513                             wxMouseEvent mouseEvent(event);
 514
 515                             long startPos = 0, endPos = 0;
 516                             wxRichTextObject* obj = GetBuffer().GetLeafObjectAtPosition(position);
 517                             if (obj)
 518                             {
 519                                 startPos = obj->GetRange().GetStart();
 520                                 endPos = obj->GetRange().GetEnd();
 521                             }
 522
 523                             wxTextUrlEvent urlEvent(GetId(), mouseEvent, startPos, endPos);
 524                             InitCommandEvent(urlEvent);
 525
 526                             urlEvent.SetString(urlTarget);
 527
 528                             GetEventHandler()->ProcessEvent(urlEvent);
 529                         }
 530                     }
 531                 }
 532             }
 533         }
 534     }
 535 }
 536
 537 /// Left-click
 538 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 539 {
 540     wxClientDC dc(this);
 541     PrepareDC(dc);
 542     dc.SetFont(GetFont());
 543
 544     long position = 0;
 545     wxPoint logicalPt = event.GetLogicalPosition(dc);
 546     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 547
 548     // See if we need to change the cursor
 549
 550     {
 551         if (hit != wxRICHTEXT_HITTEST_NONE && !(hit & wxRICHTEXT_HITTEST_OUTSIDE))
 552         {
 553             wxTextAttr attr;
 554             if (GetStyle(position, attr))
 555             {
 556                 if (attr.HasFlag(wxTEXT_ATTR_URL))
 557                 {
 558                     SetCursor(m_urlCursor);
 559                 }
 560                 else if (!attr.HasFlag(wxTEXT_ATTR_URL))
 561                 {
 562                     SetCursor(m_textCursor);
 563                 }
 564             }
 565         }
 566         else
 567             SetCursor(m_textCursor);
 568     }
 569
 570     if (!event.Dragging())
 571     {
 572         event.Skip();
 573         return;
 574     }
 575
 576     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 577     {
 578         // TODO: test closeness
 579
 580         bool caretAtLineStart = false;
 581
 582         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 583         {
 584             // If we're at the start of a line (but not first in para)
 585             // then we should keep the caret showing at the start of the line
 586             // by showing the m_caretAtLineStart flag.
 587             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 588             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 589
 590             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 591                 caretAtLineStart = true;
 592             position --;
 593         }
 594
 595         if (m_caretPosition != position)
 596         {
 597             ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 598
 599             MoveCaret(position, caretAtLineStart);
 600             SetDefaultStyleToCursorStyle();
 601         }
 602     }
 603 }
 604
 605 /// Right-click
 606 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 607 {
 608     SetFocus();
 609
 610     wxRichTextEvent cmdEvent(
 611         wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK,
 612         GetId());
 613     cmdEvent.SetEventObject(this);
 614     cmdEvent.SetPosition(m_caretPosition+1);
 615
 616     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 617         event.Skip();
 618 }
 619
 620 /// Left-double-click
 621 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& WXUNUSED(event))
 622 {
 623     wxRichTextEvent cmdEvent(
 624         wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK,
 625         GetId());
 626     cmdEvent.SetEventObject(this);
 627     cmdEvent.SetPosition(m_caretPosition+1);
 628
 629     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 630     {
 631         SelectWord(GetCaretPosition()+1);
 632     }
 633 }
 634
 635 /// Middle-click
 636 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 637 {
 638     wxRichTextEvent cmdEvent(
 639         wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK,
 640         GetId());
 641     cmdEvent.SetEventObject(this);
 642     cmdEvent.SetPosition(m_caretPosition+1);
 643
 644     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 645         event.Skip();
 646 }
 647
 648 /// Key press
 649 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 650 {
 651     int flags = 0;
 652     if (event.CmdDown())
 653         flags |= wxRICHTEXT_CTRL_DOWN;
 654     if (event.ShiftDown())
 655         flags |= wxRICHTEXT_SHIFT_DOWN;
 656     if (event.AltDown())
 657         flags |= wxRICHTEXT_ALT_DOWN;
 658
 659     if (event.GetEventType() == wxEVT_KEY_DOWN)
 660     {
 661         if (event.GetKeyCode() == WXK_LEFT ||
 662             event.GetKeyCode() == WXK_RIGHT ||
 663             event.GetKeyCode() == WXK_UP ||
 664             event.GetKeyCode() == WXK_DOWN ||
 665             event.GetKeyCode() == WXK_HOME ||
 666             event.GetKeyCode() == WXK_PAGEUP ||
 667             event.GetKeyCode() == WXK_PAGEDOWN ||
 668             event.GetKeyCode() == WXK_END ||
 669
 670             event.GetKeyCode() == WXK_NUMPAD_LEFT ||
 671             event.GetKeyCode() == WXK_NUMPAD_RIGHT ||
 672             event.GetKeyCode() == WXK_NUMPAD_UP ||
 673             event.GetKeyCode() == WXK_NUMPAD_DOWN ||
 674             event.GetKeyCode() == WXK_NUMPAD_HOME ||
 675             event.GetKeyCode() == WXK_NUMPAD_PAGEUP ||
 676             event.GetKeyCode() == WXK_NUMPAD_PAGEDOWN ||
 677             event.GetKeyCode() == WXK_NUMPAD_END)
 678         {
 679             KeyboardNavigate(event.GetKeyCode(), flags);
 680             return;
 681         }
 682
 683         long keycode = event.GetKeyCode();
 684         switch ( keycode )
 685         {
 686             case WXK_ESCAPE:
 687             case WXK_START:
 688             case WXK_LBUTTON:
 689             case WXK_RBUTTON:
 690             case WXK_CANCEL:
 691             case WXK_MBUTTON:
 692             case WXK_CLEAR:
 693             case WXK_SHIFT:
 694             case WXK_ALT:
 695             case WXK_CONTROL:
 696             case WXK_MENU:
 697             case WXK_PAUSE:
 698             case WXK_CAPITAL:
 699             case WXK_END:
 700             case WXK_HOME:
 701             case WXK_LEFT:
 702             case WXK_UP:
 703             case WXK_RIGHT:
 704             case WXK_DOWN:
 705             case WXK_SELECT:
 706             case WXK_PRINT:
 707             case WXK_EXECUTE:
 708             case WXK_SNAPSHOT:
 709             case WXK_INSERT:
 710             case WXK_HELP:
 711             case WXK_F1:
 712             case WXK_F2:
 713             case WXK_F3:
 714             case WXK_F4:
 715             case WXK_F5:
 716             case WXK_F6:
 717             case WXK_F7:
 718             case WXK_F8:
 719             case WXK_F9:
 720             case WXK_F10:
 721             case WXK_F11:
 722             case WXK_F12:
 723             case WXK_F13:
 724             case WXK_F14:
 725             case WXK_F15:
 726             case WXK_F16:
 727             case WXK_F17:
 728             case WXK_F18:
 729             case WXK_F19:
 730             case WXK_F20:
 731             case WXK_F21:
 732             case WXK_F22:
 733             case WXK_F23:
 734             case WXK_F24:
 735             case WXK_NUMLOCK:
 736             case WXK_SCROLL:
 737             case WXK_PAGEUP:
 738             case WXK_PAGEDOWN:
 739             case WXK_NUMPAD_F1:
 740             case WXK_NUMPAD_F2:
 741             case WXK_NUMPAD_F3:
 742             case WXK_NUMPAD_F4:
 743             case WXK_NUMPAD_HOME:
 744             case WXK_NUMPAD_LEFT:
 745             case WXK_NUMPAD_UP:
 746             case WXK_NUMPAD_RIGHT:
 747             case WXK_NUMPAD_DOWN:
 748             case WXK_NUMPAD_PAGEUP:
 749             case WXK_NUMPAD_PAGEDOWN:
 750             case WXK_NUMPAD_END:
 751             case WXK_NUMPAD_BEGIN:
 752             case WXK_NUMPAD_INSERT:
 753             case WXK_NUMPAD_DELETE:
 754             case WXK_WINDOWS_LEFT:
 755             {
 756                 return;
 757             }
 758             default:
 759             {
 760             }
 761         }
 762
 763         // Must process this before translation, otherwise it's translated into a WXK_DELETE event.
 764         if (event.CmdDown() && event.GetKeyCode() == WXK_BACK)
 765         {
 766             BeginBatchUndo(_("Delete Text"));
 767
 768             long newPos = m_caretPosition;
 769
 770             DeleteSelectedContent(& newPos);
 771
 772             // Submit range in character positions, which are greater than caret positions,
 773             // so subtract 1 for deleted character and add 1 for conversion to character position.
 774             if (newPos > -1)
 775             {
 776                 bool processed = false;
 777                 if (event.CmdDown())
 778                 {
 779                     long pos = wxRichTextCtrl::FindNextWordPosition(-1);
 780                     if (pos < newPos)
 781                     {
 782                         GetBuffer().DeleteRangeWithUndo(wxRichTextRange(pos+1, newPos), this);
 783                         processed = true;
 784                     }
 785                 }
 786
 787                 if (!processed)
 788                     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(newPos, newPos), this);
 789             }
 790
 791             EndBatchUndo();
 792
 793             if (GetLastPosition() == -1)
 794             {
 795                 GetBuffer().Reset();
 796
 797                 m_caretPosition = -1;
 798                 PositionCaret();
 799                 SetDefaultStyleToCursorStyle();
 800             }
 801
 802             ScrollIntoView(m_caretPosition, WXK_LEFT);
 803
 804             wxRichTextEvent cmdEvent(
 805                 wxEVT_COMMAND_RICHTEXT_DELETE,
 806                 GetId());
 807             cmdEvent.SetEventObject(this);
 808             cmdEvent.SetFlags(flags);
 809             cmdEvent.SetPosition(m_caretPosition+1);
 810             GetEventHandler()->ProcessEvent(cmdEvent);
 811
 812             Update();
 813         }
 814         else
 815             event.Skip();
 816
 817         return;
 818     }
 819
 820     // all the other keys modify the controls contents which shouldn't be
 821     // possible if we're read-only
 822     if ( !IsEditable() )
 823     {
 824         event.Skip();
 825         return;
 826     }
 827
 828     if (event.GetKeyCode() == WXK_RETURN)
 829     {
 830         BeginBatchUndo(_("Insert Text"));
 831
 832         long newPos = m_caretPosition;
 833
 834         DeleteSelectedContent(& newPos);
 835
 836         if (event.ShiftDown())
 837         {
 838             wxString text;
 839             text = wxRichTextLineBreakChar;
 840             GetBuffer().InsertTextWithUndo(newPos+1, text, this);
 841             m_caretAtLineStart = true;
 842             PositionCaret();
 843         }
 844         else
 845             GetBuffer().InsertNewlineWithUndo(newPos+1, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE|wxRICHTEXT_INSERT_INTERACTIVE);
 846
 847         EndBatchUndo();
 848         SetDefaultStyleToCursorStyle();
 849
 850         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 851
 852         wxRichTextEvent cmdEvent(
 853             wxEVT_COMMAND_RICHTEXT_RETURN,
 854             GetId());
 855         cmdEvent.SetEventObject(this);
 856         cmdEvent.SetFlags(flags);
 857         cmdEvent.SetPosition(newPos+1);
 858
 859         if (!GetEventHandler()->ProcessEvent(cmdEvent))
 860         {
 861             // Generate conventional event
 862             wxCommandEvent textEvent(wxEVT_COMMAND_TEXT_ENTER, GetId());
 863             InitCommandEvent(textEvent);
 864
 865             GetEventHandler()->ProcessEvent(textEvent);
 866         }
 867         Update();
 868     }
 869     else if (event.GetKeyCode() == WXK_BACK)
 870     {
 871         BeginBatchUndo(_("Delete Text"));
 872
 873         long newPos = m_caretPosition;
 874
 875         bool processed = DeleteSelectedContent(& newPos);
 876
 877         // Submit range in character positions, which are greater than caret positions,
 878         // so subtract 1 for deleted character and add 1 for conversion to character position.
 879         if (newPos > -1)
 880         {
 881             if (event.CmdDown())
 882             {
 883                 long pos = wxRichTextCtrl::FindNextWordPosition(-1);
 884                 if (pos < newPos)
 885                 {
 886                     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(pos+1, newPos), this);
 887                     processed = true;
 888                 }
 889             }
 890
 891             if (!processed)
 892                 GetBuffer().DeleteRangeWithUndo(wxRichTextRange(newPos, newPos), this);
 893         }
 894
 895         EndBatchUndo();
 896
 897         if (GetLastPosition() == -1)
 898         {
 899             GetBuffer().Reset();
 900
 901             m_caretPosition = -1;
 902             PositionCaret();
 903             SetDefaultStyleToCursorStyle();
 904         }
 905
 906         ScrollIntoView(m_caretPosition, WXK_LEFT);
 907
 908         wxRichTextEvent cmdEvent(
 909             wxEVT_COMMAND_RICHTEXT_DELETE,
 910             GetId());
 911         cmdEvent.SetEventObject(this);
 912         cmdEvent.SetFlags(flags);
 913         cmdEvent.SetPosition(m_caretPosition+1);
 914         GetEventHandler()->ProcessEvent(cmdEvent);
 915
 916         Update();
 917     }
 918     else if (event.GetKeyCode() == WXK_DELETE)
 919     {
 920         BeginBatchUndo(_("Delete Text"));
 921
 922         long newPos = m_caretPosition;
 923
 924         bool processed = DeleteSelectedContent(& newPos);
 925
 926         // Submit range in character positions, which are greater than caret positions,
 927         if (newPos < GetBuffer().GetRange().GetEnd()+1)
 928         {
 929             if (event.CmdDown())
 930             {
 931                 long pos = wxRichTextCtrl::FindNextWordPosition(1);
 932                 if (pos != -1 && (pos > newPos))
 933                 {
 934                     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(newPos+1, pos), this);
 935                     processed = true;
 936                 }
 937             }
 938
 939             if (!processed)
 940                 GetBuffer().DeleteRangeWithUndo(wxRichTextRange(newPos+1, newPos+1), this);
 941         }
 942
 943         EndBatchUndo();
 944
 945         if (GetLastPosition() == -1)
 946         {
 947             GetBuffer().Reset();
 948
 949             m_caretPosition = -1;
 950             PositionCaret();
 951             SetDefaultStyleToCursorStyle();
 952         }
 953
 954         wxRichTextEvent cmdEvent(
 955             wxEVT_COMMAND_RICHTEXT_DELETE,
 956             GetId());
 957         cmdEvent.SetEventObject(this);
 958         cmdEvent.SetFlags(flags);
 959         cmdEvent.SetPosition(m_caretPosition+1);
 960         GetEventHandler()->ProcessEvent(cmdEvent);
 961
 962         Update();
 963     }
 964     else
 965     {
 966         long keycode = event.GetKeyCode();
 967         switch ( keycode )
 968         {
 969             case WXK_ESCAPE:
 970             {
 971                 event.Skip();
 972                 return;
 973             }
 974
 975             default:
 976             {
 977 #ifdef __WXMAC__
 978                 if (event.CmdDown())
 979 #else
 980                 if (event.CmdDown() || event.AltDown())
 981 #endif
 982                 {
 983                     event.Skip();
 984                     return;
 985                 }
 986
 987                 wxRichTextEvent cmdEvent(
 988                     wxEVT_COMMAND_RICHTEXT_CHARACTER,
 989                     GetId());
 990                 cmdEvent.SetEventObject(this);
 991                 cmdEvent.SetFlags(flags);
 992 #if wxUSE_UNICODE
 993                 cmdEvent.SetCharacter(event.GetUnicodeKey());
 994 #else
 995                 cmdEvent.SetCharacter((wxChar) keycode);
 996 #endif
 997                 cmdEvent.SetPosition(m_caretPosition+1);
 998
 999                 if (keycode == wxT('\t'))
1000                 {
1001                     // See if we need to promote or demote the selection or paragraph at the cursor
1002                     // position, instead of inserting a tab.
1003                     long pos = GetAdjustedCaretPosition(GetCaretPosition());
1004                     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos);
1005                     if (para && para->GetRange().GetStart() == pos && para->GetAttributes().HasListStyleName())
1006                     {
1007                         wxRichTextRange range;
1008                         if (HasSelection())
1009                             range = GetSelectionRange();
1010                         else
1011                             range = para->GetRange().FromInternal();
1012
1013                         int promoteBy = event.ShiftDown() ? 1 : -1;
1014
1015                         PromoteList(promoteBy, range, NULL);
1016
1017                         GetEventHandler()->ProcessEvent(cmdEvent);
1018
1019                         return;
1020                     }
1021                 }
1022
1023                 BeginBatchUndo(_("Insert Text"));
1024
1025                 long newPos = m_caretPosition;
1026                 DeleteSelectedContent(& newPos);
1027
1028 #if wxUSE_UNICODE
1029                 wxString str = event.GetUnicodeKey();
1030 #else
1031                 wxString str = (wxChar) event.GetKeyCode();
1032 #endif
1033                 GetBuffer().InsertTextWithUndo(newPos+1, str, this, 0);
1034
1035                 EndBatchUndo();
1036
1037                 SetDefaultStyleToCursorStyle();
1038                 ScrollIntoView(m_caretPosition, WXK_RIGHT);
1039
1040                 GetEventHandler()->ProcessEvent(cmdEvent);
1041
1042                 Update();
1043             }
1044         }
1045     }
1046 }
1047
1048 /// Delete content if there is a selection, e.g. when pressing a key.
1049 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
1050 {
1051     if (HasSelection())
1052     {
1053         long pos = m_selectionRange.GetStart();
1054         GetBuffer().DeleteRangeWithUndo(m_selectionRange, this);
1055         m_selectionRange.SetRange(-2, -2);
1056
1057         if (newPos)
1058             *newPos = pos-1;
1059         return true;
1060     }
1061     else
1062         return false;
1063 }
1064
1065 /// Keyboard navigation
1066
1067 /*
1068
1069 Left:       left one character
1070 Right:      right one character
1071 Up:         up one line
1072 Down:       down one line
1073 Ctrl-Left:  left one word
1074 Ctrl-Right: right one word
1075 Ctrl-Up:    previous paragraph start
1076 Ctrl-Down:  next start of paragraph
1077 Home:       start of line
1078 End:        end of line
1079 Ctrl-Home:  start of document
1080 Ctrl-End:   end of document
1081 Page-Up:    Up a screen
1082 Page-Down:  Down a screen
1083
1084 Maybe:
1085
1086 Ctrl-Alt-PgUp: Start of window
1087 Ctrl-Alt-PgDn: End of window
1088 F8:         Start selection mode
1089 Esc:        End selection mode
1090
1091 Adding Shift does the above but starts/extends selection.
1092
1093
1094  */
1095
1096 bool wxRichTextCtrl::KeyboardNavigate(int keyCode, int flags)
1097 {
1098     bool success = false;
1099
1100     if (keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT)
1101     {
1102         if (flags & wxRICHTEXT_CTRL_DOWN)
1103             success = WordRight(1, flags);
1104         else
1105             success = MoveRight(1, flags);
1106     }
1107     else if (keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT)
1108     {
1109         if (flags & wxRICHTEXT_CTRL_DOWN)
1110             success = WordLeft(1, flags);
1111         else
1112             success = MoveLeft(1, flags);
1113     }
1114     else if (keyCode == WXK_UP || keyCode == WXK_NUMPAD_UP)
1115     {
1116         if (flags & wxRICHTEXT_CTRL_DOWN)
1117             success = MoveToParagraphStart(flags);
1118         else
1119             success = MoveUp(1, flags);
1120     }
1121     else if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN)
1122     {
1123         if (flags & wxRICHTEXT_CTRL_DOWN)
1124             success = MoveToParagraphEnd(flags);
1125         else
1126             success = MoveDown(1, flags);
1127     }
1128     else if (keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP)
1129     {
1130         success = PageUp(1, flags);
1131     }
1132     else if (keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
1133     {
1134         success = PageDown(1, flags);
1135     }
1136     else if (keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME)
1137     {
1138         if (flags & wxRICHTEXT_CTRL_DOWN)
1139             success = MoveHome(flags);
1140         else
1141             success = MoveToLineStart(flags);
1142     }
1143     else if (keyCode == WXK_END || keyCode == WXK_NUMPAD_END)
1144     {
1145         if (flags & wxRICHTEXT_CTRL_DOWN)
1146             success = MoveEnd(flags);
1147         else
1148             success = MoveToLineEnd(flags);
1149     }
1150
1151     if (success)
1152     {
1153         ScrollIntoView(m_caretPosition, keyCode);
1154         SetDefaultStyleToCursorStyle();
1155     }
1156
1157     return success;
1158 }
1159
1160 /// Extend the selection. Selections are in caret positions.
1161 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
1162 {
1163     if (flags & wxRICHTEXT_SHIFT_DOWN)
1164     {
1165         if (oldPos == newPos)
1166             return false;
1167
1168         wxRichTextRange oldSelection = m_selectionRange;
1169
1170         // If not currently selecting, start selecting
1171         if (m_selectionRange.GetStart() == -2)
1172         {
1173             m_selectionAnchor = oldPos;
1174
1175             if (oldPos > newPos)
1176                 m_selectionRange.SetRange(newPos+1, oldPos);
1177             else
1178                 m_selectionRange.SetRange(oldPos+1, newPos);
1179         }
1180         else
1181         {
1182             // Always ensure that the selection range start is greater than
1183             // the end.
1184             if (newPos > m_selectionAnchor)
1185                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
1186             else if (newPos == m_selectionAnchor)
1187                 m_selectionRange = wxRichTextRange(-2, -2);
1188             else
1189                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
1190         }
1191
1192         RefreshForSelectionChange(oldSelection, m_selectionRange);
1193
1194         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
1195         {
1196             wxLogDebug(wxT("Strange selection range"));
1197         }
1198
1199         return true;
1200     }
1201     else
1202         return false;
1203 }
1204
1205 /// Scroll into view, returning true if we scrolled.
1206 /// This takes a _caret_ position.
1207 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
1208 {
1209     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
1210
1211     if (!line)
1212         return false;
1213
1214     int ppuX, ppuY;
1215     GetScrollPixelsPerUnit(& ppuX, & ppuY);
1216
1217     int startXUnits, startYUnits;
1218     GetViewStart(& startXUnits, & startYUnits);
1219     int startY = startYUnits * ppuY;
1220
1221     int sx = 0, sy = 0;
1222     GetVirtualSize(& sx, & sy);
1223     int sxUnits = 0;
1224     int syUnits = 0;
1225     if (ppuY != 0)
1226         syUnits = sy/ppuY;
1227
1228     wxRect rect = line->GetRect();
1229
1230     bool scrolled = false;
1231
1232     wxSize clientSize = GetClientSize();
1233
1234     // Going down
1235     if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN ||
1236         keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT ||
1237         keyCode == WXK_END || keyCode == WXK_NUMPAD_END ||
1238         keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
1239     {
1240         if ((rect.y + rect.height) > (clientSize.y + startY))
1241         {
1242             // Make it scroll so this item is at the bottom
1243             // of the window
1244             int y = rect.y - (clientSize.y - rect.height);
1245             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1246
1247             // If we're still off the screen, scroll another line down
1248             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1249                 yUnits ++;
1250
1251             if (startYUnits != yUnits)
1252             {
1253                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1254                 scrolled = true;
1255             }
1256         }
1257         else if (rect.y < startY)
1258         {
1259             // Make it scroll so this item is at the top
1260             // of the window
1261             int y = rect.y ;
1262             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1263
1264             if (startYUnits != yUnits)
1265             {
1266                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1267                 scrolled = true;
1268             }
1269         }
1270     }
1271     // Going up
1272     else if (keyCode == WXK_UP  || keyCode == WXK_NUMPAD_UP ||
1273              keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT ||
1274              keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME ||
1275              keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP )
1276     {
1277         if (rect.y < startY)
1278         {
1279             // Make it scroll so this item is at the top
1280             // of the window
1281             int y = rect.y ;
1282             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1283
1284             if (startYUnits != yUnits)
1285             {
1286                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1287                 scrolled = true;
1288             }
1289         }
1290         else if ((rect.y + rect.height) > (clientSize.y + startY))
1291         {
1292             // Make it scroll so this item is at the bottom
1293             // of the window
1294             int y = rect.y - (clientSize.y - rect.height);
1295             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1296
1297             // If we're still off the screen, scroll another line down
1298             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1299                 yUnits ++;
1300
1301             if (startYUnits != yUnits)
1302             {
1303                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1304                 scrolled = true;
1305             }
1306         }
1307     }
1308
1309 #if !wxRICHTEXT_USE_OWN_CARET
1310     if (scrolled)
1311 #endif
1312         PositionCaret();
1313
1314     return scrolled;
1315 }
1316
1317 /// Is the given position visible on the screen?
1318 bool wxRichTextCtrl::IsPositionVisible(long pos) const
1319 {
1320     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
1321
1322     if (!line)
1323         return false;
1324
1325     int ppuX, ppuY;
1326     GetScrollPixelsPerUnit(& ppuX, & ppuY);
1327
1328     int startX, startY;
1329     GetViewStart(& startX, & startY);
1330     startX = 0;
1331     startY = startY * ppuY;
1332
1333     wxRect rect = line->GetRect();
1334     wxSize clientSize = GetClientSize();
1335
1336     return (rect.GetBottom() > startY) && (rect.GetTop() < (startY + clientSize.y));
1337 }
1338
1339 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
1340 {
1341     m_caretPosition = position;
1342     m_caretAtLineStart = showAtLineStart;
1343 }
1344
1345 /// Move caret one visual step forward: this may mean setting a flag
1346 /// and keeping the same position if we're going from the end of one line
1347 /// to the start of the next, which may be the exact same caret position.
1348 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
1349 {
1350     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1351
1352     // Only do the check if we're not at the end of the paragraph (where things work OK
1353     // anyway)
1354     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
1355     {
1356         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1357
1358         if (line)
1359         {
1360             wxRichTextRange lineRange = line->GetAbsoluteRange();
1361
1362             // We're at the end of a line. See whether we need to
1363             // stay at the same actual caret position but change visual
1364             // position, or not.
1365             if (oldPosition == lineRange.GetEnd())
1366             {
1367                 if (m_caretAtLineStart)
1368                 {
1369                     // We're already at the start of the line, so actually move on now.
1370                     m_caretPosition = oldPosition + 1;
1371                     m_caretAtLineStart = false;
1372                 }
1373                 else
1374                 {
1375                     // We're showing at the end of the line, so keep to
1376                     // the same position but indicate that we're to show
1377                     // at the start of the next line.
1378                     m_caretPosition = oldPosition;
1379                     m_caretAtLineStart = true;
1380                 }
1381                 SetDefaultStyleToCursorStyle();
1382                 return;
1383             }
1384         }
1385     }
1386     m_caretPosition ++;
1387     SetDefaultStyleToCursorStyle();
1388 }
1389
1390 /// Move caret one visual step backward: this may mean setting a flag
1391 /// and keeping the same position if we're going from the end of one line
1392 /// to the start of the next, which may be the exact same caret position.
1393 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
1394 {
1395     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1396
1397     // Only do the check if we're not at the start of the paragraph (where things work OK
1398     // anyway)
1399     if (para && (oldPosition != para->GetRange().GetStart()))
1400     {
1401         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1402
1403         if (line)
1404         {
1405             wxRichTextRange lineRange = line->GetAbsoluteRange();
1406
1407             // We're at the start of a line. See whether we need to
1408             // stay at the same actual caret position but change visual
1409             // position, or not.
1410             if (oldPosition == lineRange.GetStart())
1411             {
1412                 m_caretPosition = oldPosition-1;
1413                 m_caretAtLineStart = true;
1414                 return;
1415             }
1416             else if (oldPosition == lineRange.GetEnd())
1417             {
1418                 if (m_caretAtLineStart)
1419                 {
1420                     // We're at the start of the line, so keep the same caret position
1421                     // but clear the start-of-line flag.
1422                     m_caretPosition = oldPosition;
1423                     m_caretAtLineStart = false;
1424                 }
1425                 else
1426                 {
1427                     // We're showing at the end of the line, so go back
1428                     // to the previous character position.
1429                     m_caretPosition = oldPosition - 1;
1430                 }
1431                 SetDefaultStyleToCursorStyle();
1432                 return;
1433             }
1434         }
1435     }
1436     m_caretPosition --;
1437     SetDefaultStyleToCursorStyle();
1438 }
1439
1440 /// Move right
1441 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
1442 {
1443     long endPos = GetBuffer().GetRange().GetEnd();
1444
1445     if (m_caretPosition + noPositions < endPos)
1446     {
1447         long oldPos = m_caretPosition;
1448         long newPos = m_caretPosition + noPositions;
1449
1450         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1451         if (!extendSel)
1452             SelectNone();
1453
1454         // Determine by looking at oldPos and m_caretPosition whether
1455         // we moved from the end of a line to the start of the next line, in which case
1456         // we want to adjust the caret position such that it is positioned at the
1457         // start of the next line, rather than jumping past the first character of the
1458         // line.
1459         if (noPositions == 1 && !extendSel)
1460             MoveCaretForward(oldPos);
1461         else
1462             SetCaretPosition(newPos);
1463
1464         PositionCaret();
1465         SetDefaultStyleToCursorStyle();
1466
1467         return true;
1468     }
1469     else
1470         return false;
1471 }
1472
1473 /// Move left
1474 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
1475 {
1476     long startPos = -1;
1477
1478     if (m_caretPosition > startPos - noPositions + 1)
1479     {
1480         long oldPos = m_caretPosition;
1481         long newPos = m_caretPosition - noPositions;
1482         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1483         if (!extendSel)
1484             SelectNone();
1485
1486         if (noPositions == 1 && !extendSel)
1487             MoveCaretBack(oldPos);
1488         else
1489             SetCaretPosition(newPos);
1490
1491         PositionCaret();
1492         SetDefaultStyleToCursorStyle();
1493
1494         return true;
1495     }
1496     else
1497         return false;
1498 }
1499
1500 /// Move up
1501 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
1502 {
1503     return MoveDown(- noLines, flags);
1504 }
1505
1506 /// Move up
1507 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
1508 {
1509     if (!GetCaret())
1510         return false;
1511
1512     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
1513     wxPoint pt = GetCaret()->GetPosition();
1514     long newLine = lineNumber + noLines;
1515
1516     if (lineNumber != -1)
1517     {
1518         if (noLines > 0)
1519         {
1520             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
1521
1522             if (newLine > lastLine)
1523                 return false;
1524         }
1525         else
1526         {
1527             if (newLine < 0)
1528                 return false;
1529         }
1530     }
1531
1532     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1533     if (lineObj)
1534     {
1535         pt.y = lineObj->GetAbsolutePosition().y + 2;
1536     }
1537     else
1538         return false;
1539
1540     long newPos = 0;
1541     wxClientDC dc(this);
1542     PrepareDC(dc);
1543     dc.SetFont(GetFont());
1544
1545     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1546
1547     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1548     {
1549         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1550         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1551         // so we view the caret at the start of the line.
1552         bool caretLineStart = false;
1553         if (hitTest & wxRICHTEXT_HITTEST_BEFORE)
1554         {
1555             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1556             wxRichTextRange lineRange;
1557             if (thisLine)
1558                 lineRange = thisLine->GetAbsoluteRange();
1559
1560             if (thisLine && (newPos-1) == lineRange.GetEnd())
1561             {
1562                 newPos --;
1563                 caretLineStart = true;
1564             }
1565             else
1566             {
1567                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1568                 if (para && para->GetRange().GetStart() == newPos)
1569                     newPos --;
1570             }
1571         }
1572
1573         long newSelEnd = newPos;
1574
1575         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1576         if (!extendSel)
1577             SelectNone();
1578
1579         SetCaretPosition(newPos, caretLineStart);
1580         PositionCaret();
1581         SetDefaultStyleToCursorStyle();
1582
1583         return true;
1584     }
1585
1586     return false;
1587 }
1588
1589 /// Move to the end of the paragraph
1590 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1591 {
1592     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1593     if (para)
1594     {
1595         long newPos = para->GetRange().GetEnd() - 1;
1596         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1597         if (!extendSel)
1598             SelectNone();
1599
1600         SetCaretPosition(newPos);
1601         PositionCaret();
1602         SetDefaultStyleToCursorStyle();
1603
1604         return true;
1605     }
1606
1607     return false;
1608 }
1609
1610 /// Move to the start of the paragraph
1611 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1612 {
1613     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1614     if (para)
1615     {
1616         long newPos = para->GetRange().GetStart() - 1;
1617         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1618         if (!extendSel)
1619             SelectNone();
1620
1621         SetCaretPosition(newPos);
1622         PositionCaret();
1623         SetDefaultStyleToCursorStyle();
1624
1625         return true;
1626     }
1627
1628     return false;
1629 }
1630
1631 /// Move to the end of the line
1632 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1633 {
1634     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1635
1636     if (line)
1637     {
1638         wxRichTextRange lineRange = line->GetAbsoluteRange();
1639         long newPos = lineRange.GetEnd();
1640         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1641         if (!extendSel)
1642             SelectNone();
1643
1644         SetCaretPosition(newPos);
1645         PositionCaret();
1646         SetDefaultStyleToCursorStyle();
1647
1648         return true;
1649     }
1650
1651     return false;
1652 }
1653
1654 /// Move to the start of the line
1655 bool wxRichTextCtrl::MoveToLineStart(int flags)
1656 {
1657     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1658     if (line)
1659     {
1660         wxRichTextRange lineRange = line->GetAbsoluteRange();
1661         long newPos = lineRange.GetStart()-1;
1662
1663         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1664         if (!extendSel)
1665             SelectNone();
1666
1667         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1668
1669         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1670         PositionCaret();
1671         SetDefaultStyleToCursorStyle();
1672
1673         return true;
1674     }
1675
1676     return false;
1677 }
1678
1679 /// Move to the start of the buffer
1680 bool wxRichTextCtrl::MoveHome(int flags)
1681 {
1682     if (m_caretPosition != -1)
1683     {
1684         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1685         if (!extendSel)
1686             SelectNone();
1687
1688         SetCaretPosition(-1);
1689         PositionCaret();
1690         SetDefaultStyleToCursorStyle();
1691
1692         return true;
1693     }
1694     else
1695         return false;
1696 }
1697
1698 /// Move to the end of the buffer
1699 bool wxRichTextCtrl::MoveEnd(int flags)
1700 {
1701     long endPos = GetBuffer().GetRange().GetEnd()-1;
1702
1703     if (m_caretPosition != endPos)
1704     {
1705         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1706         if (!extendSel)
1707             SelectNone();
1708
1709         SetCaretPosition(endPos);
1710         PositionCaret();
1711         SetDefaultStyleToCursorStyle();
1712
1713         return true;
1714     }
1715     else
1716         return false;
1717 }
1718
1719 /// Move noPages pages up
1720 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1721 {
1722     return PageDown(- noPages, flags);
1723 }
1724
1725 /// Move noPages pages down
1726 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1727 {
1728     // Calculate which line occurs noPages * screen height further down.
1729     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1730     if (line)
1731     {
1732         wxSize clientSize = GetClientSize();
1733         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1734
1735         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1736         if (newLine)
1737         {
1738             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1739             long pos = lineRange.GetStart()-1;
1740             if (pos != m_caretPosition)
1741             {
1742                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1743
1744                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1745                 if (!extendSel)
1746                     SelectNone();
1747
1748                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1749                 PositionCaret();
1750                 SetDefaultStyleToCursorStyle();
1751
1752                 return true;
1753             }
1754         }
1755     }
1756
1757     return false;
1758 }
1759
1760 static bool wxRichTextCtrlIsWhitespace(const wxString& str)
1761 {
1762     return str == wxT(" ") || str == wxT("\t");
1763 }
1764
1765 // Finds the caret position for the next word
1766 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1767 {
1768     long endPos = GetBuffer().GetRange().GetEnd();
1769
1770     if (direction > 0)
1771     {
1772         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1773
1774         // First skip current text to space
1775         while (i < endPos && i > -1)
1776         {
1777             // i is in character, not caret positions
1778             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1779             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1780             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1781             {
1782                 break;
1783             }
1784             else if (!wxRichTextCtrlIsWhitespace(text) && !text.empty())
1785                 i += direction;
1786             else
1787             {
1788                 break;
1789             }
1790         }
1791         while (i < endPos && i > -1)
1792         {
1793             // i is in character, not caret positions
1794             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1795             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1796             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1797                 return wxMax(-1, i);
1798
1799             if (text.empty()) // End of paragraph, or maybe an image
1800                 return wxMax(-1, i - 1);
1801             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1802                 i += direction;
1803             else
1804             {
1805                 // Convert to caret position
1806                 return wxMax(-1, i - 1);
1807             }
1808         }
1809         if (i >= endPos)
1810             return endPos-1;
1811         return i-1;
1812     }
1813     else
1814     {
1815         long i = m_caretPosition;
1816
1817         // First skip white space
1818         while (i < endPos && i > -1)
1819         {
1820             // i is in character, not caret positions
1821             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1822             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1823
1824             if (text.empty() || (line && (i == line->GetAbsoluteRange().GetStart()))) // End of paragraph, or maybe an image
1825                 break;
1826             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1827                 i += direction;
1828             else
1829                 break;
1830         }
1831         // Next skip current text to space
1832         while (i < endPos && i > -1)
1833         {
1834             // i is in character, not caret positions
1835             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1836             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1837             if (line && line->GetAbsoluteRange().GetStart() == i)
1838                 return i-1;
1839
1840             if (!wxRichTextCtrlIsWhitespace(text) /* && !text.empty() */)
1841                 i += direction;
1842             else
1843             {
1844                 return i;
1845             }
1846         }
1847         if (i < -1)
1848             return -1;
1849         return i;
1850     }
1851 }
1852
1853 /// Move n words left
1854 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1855 {
1856     long pos = FindNextWordPosition(-1);
1857     if (pos != m_caretPosition)
1858     {
1859         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1860
1861         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1862         if (!extendSel)
1863             SelectNone();
1864
1865         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1866         PositionCaret();
1867         SetDefaultStyleToCursorStyle();
1868
1869         return true;
1870     }
1871
1872     return false;
1873 }
1874
1875 /// Move n words right
1876 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1877 {
1878     long pos = FindNextWordPosition(1);
1879     if (pos != m_caretPosition)
1880     {
1881         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1882
1883         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1884         if (!extendSel)
1885             SelectNone();
1886
1887         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1888         PositionCaret();
1889         SetDefaultStyleToCursorStyle();
1890
1891         return true;
1892     }
1893
1894     return false;
1895 }
1896
1897 /// Sizing
1898 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1899 {
1900     // Only do sizing optimization for large buffers
1901     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1902     {
1903         m_fullLayoutRequired = true;
1904         m_fullLayoutTime = wxGetLocalTimeMillis();
1905         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1906         LayoutContent(true /* onlyVisibleRect */);
1907     }
1908     else
1909         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1910
1911 #if wxRICHTEXT_BUFFERED_PAINTING
1912     RecreateBuffer();
1913 #endif
1914
1915     event.Skip();
1916 }
1917
1918
1919 /// Idle-time processing
1920 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1921 {
1922 #if wxRICHTEXT_USE_OWN_CARET
1923     if (((wxRichTextCaret*) GetCaret())->GetNeedsUpdate())
1924     {
1925         ((wxRichTextCaret*) GetCaret())->SetNeedsUpdate(false);
1926         PositionCaret();
1927         GetCaret()->Show();
1928     }
1929 #endif
1930
1931     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1932
1933     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1934     {
1935         m_fullLayoutRequired = false;
1936         m_fullLayoutTime = 0;
1937         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1938         ShowPosition(m_fullLayoutSavedPosition);
1939         Refresh(false);
1940     }
1941
1942     if (m_caretPositionForDefaultStyle != -2)
1943     {
1944         // If the caret position has changed, no longer reflect the default style
1945         // in the UI.
1946         if (GetCaretPosition() != m_caretPositionForDefaultStyle)
1947             m_caretPositionForDefaultStyle = -2;
1948     }
1949
1950     event.Skip();
1951 }
1952
1953 /// Scrolling
1954 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1955 {
1956 #if wxRICHTEXT_USE_OWN_CARET
1957     if (!((wxRichTextCaret*) GetCaret())->GetNeedsUpdate())
1958     {
1959         GetCaret()->Hide();
1960         ((wxRichTextCaret*) GetCaret())->SetNeedsUpdate();
1961     }
1962 #endif
1963
1964     event.Skip();
1965 }
1966
1967 /// Set up scrollbars, e.g. after a resize
1968 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1969 {
1970     if (IsFrozen())
1971         return;
1972
1973     if (GetBuffer().IsEmpty())
1974     {
1975         SetScrollbars(0, 0, 0, 0, 0, 0);
1976         return;
1977     }
1978
1979     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1980     // of pixels. See e.g. wxVScrolledWindow for ideas.
1981     int pixelsPerUnit = 5;
1982     wxSize clientSize = GetClientSize();
1983
1984     int maxHeight = GetBuffer().GetCachedSize().y;
1985
1986     // Round up so we have at least maxHeight pixels
1987     int unitsY = (int) (((float)maxHeight/(float)pixelsPerUnit) + 0.5);
1988
1989     int startX = 0, startY = 0;
1990     if (!atTop)
1991         GetViewStart(& startX, & startY);
1992
1993     int maxPositionX = 0;
1994     int maxPositionY = (int) ((((float)(wxMax((unitsY*pixelsPerUnit) - clientSize.y, 0)))/((float)pixelsPerUnit)) + 0.5);
1995
1996     int newStartX = wxMin(maxPositionX, startX);
1997     int newStartY = wxMin(maxPositionY, startY);
1998
1999     int oldPPUX, oldPPUY;
2000     int oldStartX, oldStartY;
2001     int oldVirtualSizeX = 0, oldVirtualSizeY = 0;
2002     GetScrollPixelsPerUnit(& oldPPUX, & oldPPUY);
2003     GetViewStart(& oldStartX, & oldStartY);
2004     GetVirtualSize(& oldVirtualSizeX, & oldVirtualSizeY);
2005     if (oldPPUY > 0)
2006         oldVirtualSizeY /= oldPPUY;
2007
2008     if (oldPPUX == 0 && oldPPUY == pixelsPerUnit && oldVirtualSizeY == unitsY && oldStartX == newStartX && oldStartY == newStartY)
2009         return;
2010
2011     // Don't set scrollbars if there were none before, and there will be none now.
2012     if (oldPPUY != 0 && (oldVirtualSizeY < clientSize.y) && (unitsY*pixelsPerUnit < clientSize.y))
2013         return;
2014
2015     // Move to previous scroll position if
2016     // possible
2017     SetScrollbars(0, pixelsPerUnit, 0, unitsY, newStartX, newStartY);
2018 }
2019
2020 /// Paint the background
2021 void wxRichTextCtrl::PaintBackground(wxDC& dc)
2022 {
2023     wxColour backgroundColour = GetBackgroundColour();
2024     if (!backgroundColour.Ok())
2025         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
2026
2027     // Clear the background
2028     dc.SetBrush(wxBrush(backgroundColour));
2029     dc.SetPen(*wxTRANSPARENT_PEN);
2030     wxRect windowRect(GetClientSize());
2031     windowRect.x -= 2; windowRect.y -= 2;
2032     windowRect.width += 4; windowRect.height += 4;
2033
2034     // We need to shift the rectangle to take into account
2035     // scrolling. Converting device to logical coordinates.
2036     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
2037     dc.DrawRectangle(windowRect);
2038 }
2039
2040 #if wxRICHTEXT_BUFFERED_PAINTING
2041 /// Recreate buffer bitmap if necessary
2042 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
2043 {
2044     wxSize sz = size;
2045     if (sz == wxDefaultSize)
2046         sz = GetClientSize();
2047
2048     if (sz.x < 1 || sz.y < 1)
2049         return false;
2050
2051     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
2052         m_bufferBitmap = wxBitmap(sz.x, sz.y);
2053     return m_bufferBitmap.Ok();
2054 }
2055 #endif
2056
2057 // ----------------------------------------------------------------------------
2058 // file IO functions
2059 // ----------------------------------------------------------------------------
2060
2061 bool wxRichTextCtrl::DoLoadFile(const wxString& filename, int fileType)
2062 {
2063     bool success = GetBuffer().LoadFile(filename, (wxRichTextFileType)fileType);
2064     if (success)
2065         m_filename = filename;
2066
2067     DiscardEdits();
2068     SetInsertionPoint(0);
2069     LayoutContent();
2070     PositionCaret();
2071     SetupScrollbars(true);
2072     Refresh(false);
2073     wxTextCtrl::SendTextUpdatedEvent(this);
2074
2075     if (success)
2076         return true;
2077     else
2078     {
2079         wxLogError(_("File couldn't be loaded."));
2080
2081         return false;
2082     }
2083 }
2084
2085 bool wxRichTextCtrl::DoSaveFile(const wxString& filename, int fileType)
2086 {
2087     if (GetBuffer().SaveFile(filename, (wxRichTextFileType)fileType))
2088     {
2089         m_filename = filename;
2090
2091         DiscardEdits();
2092
2093         return true;
2094     }
2095
2096     wxLogError(_("The text couldn't be saved."));
2097
2098     return false;
2099 }
2100
2101 // ----------------------------------------------------------------------------
2102 // wxRichTextCtrl specific functionality
2103 // ----------------------------------------------------------------------------
2104
2105 /// Add a new paragraph of text to the end of the buffer
2106 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
2107 {
2108     wxRichTextRange range = GetBuffer().AddParagraph(text);
2109     LayoutContent();
2110     return range;
2111 }
2112
2113 /// Add an image
2114 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
2115 {
2116     wxRichTextRange range = GetBuffer().AddImage(image);
2117     LayoutContent();
2118     return range;
2119 }
2120
2121 // ----------------------------------------------------------------------------
2122 // selection and ranges
2123 // ----------------------------------------------------------------------------
2124
2125 void wxRichTextCtrl::SelectAll()
2126 {
2127     SetSelection(0, GetLastPosition()+1);
2128     m_selectionAnchor = -1;
2129 }
2130
2131 /// Select none
2132 void wxRichTextCtrl::SelectNone()
2133 {
2134     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
2135     {
2136         wxRichTextRange oldSelection = m_selectionRange;
2137
2138         m_selectionRange = wxRichTextRange(-2, -2);
2139
2140         RefreshForSelectionChange(oldSelection, m_selectionRange);
2141     }
2142     m_selectionAnchor = -2;
2143 }
2144
2145 static bool wxIsWordDelimiter(const wxString& text)
2146 {
2147     return !text.IsEmpty() && !wxIsalnum(text[0]);
2148 }
2149
2150 /// Select the word at the given character position
2151 bool wxRichTextCtrl::SelectWord(long position)
2152 {
2153     if (position < 0 || position > GetBuffer().GetRange().GetEnd())
2154         return false;
2155
2156     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
2157     if (!para)
2158         return false;
2159
2160     if (position == para->GetRange().GetEnd())
2161         position --;
2162
2163     long positionStart = position;
2164     long positionEnd = position;
2165
2166     for (positionStart = position; positionStart >= para->GetRange().GetStart(); positionStart --)
2167     {
2168         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionStart, positionStart));
2169         if (wxIsWordDelimiter(text))
2170         {
2171             positionStart ++;
2172             break;
2173         }
2174     }
2175     if (positionStart < para->GetRange().GetStart())
2176         positionStart = para->GetRange().GetStart();
2177
2178     for (positionEnd = position; positionEnd < para->GetRange().GetEnd(); positionEnd ++)
2179     {
2180         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionEnd, positionEnd));
2181         if (wxIsWordDelimiter(text))
2182         {
2183             positionEnd --;
2184             break;
2185         }
2186     }
2187     if (positionEnd >= para->GetRange().GetEnd())
2188         positionEnd = para->GetRange().GetEnd();
2189
2190     if (positionEnd < positionStart)
2191         return false;
2192
2193     SetSelection(positionStart, positionEnd+1);
2194
2195     if (positionStart >= 0)
2196     {
2197         MoveCaret(positionStart-1, true);
2198         SetDefaultStyleToCursorStyle();
2199     }
2200
2201     return true;
2202 }
2203
2204 wxString wxRichTextCtrl::GetStringSelection() const
2205 {
2206     long from, to;
2207     GetSelection(&from, &to);
2208
2209     return GetRange(from, to);
2210 }
2211
2212 // ----------------------------------------------------------------------------
2213 // hit testing
2214 // ----------------------------------------------------------------------------
2215
2216 wxTextCtrlHitTestResult
2217 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
2218 {
2219     // implement in terms of the other overload as the native ports typically
2220     // can get the position and not (x, y) pair directly (although wxUniv
2221     // directly gets x and y -- and so overrides this method as well)
2222     long pos;
2223     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
2224
2225     if ( rc != wxTE_HT_UNKNOWN )
2226     {
2227         PositionToXY(pos, x, y);
2228     }
2229
2230     return rc;
2231 }
2232
2233 wxTextCtrlHitTestResult
2234 wxRichTextCtrl::HitTest(const wxPoint& pt,
2235                         long * pos) const
2236 {
2237     wxClientDC dc((wxRichTextCtrl*) this);
2238     ((wxRichTextCtrl*)this)->PrepareDC(dc);
2239
2240     // Buffer uses logical position (relative to start of buffer)
2241     // so convert
2242     wxPoint pt2 = GetLogicalPoint(pt);
2243
2244     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt2, *pos);
2245
2246     if ((hit & wxRICHTEXT_HITTEST_BEFORE) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2247         return wxTE_HT_BEFORE;
2248     else if ((hit & wxRICHTEXT_HITTEST_AFTER) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2249         return wxTE_HT_BEYOND;
2250     else if (hit & (wxRICHTEXT_HITTEST_BEFORE|wxRICHTEXT_HITTEST_AFTER))
2251         return wxTE_HT_ON_TEXT;
2252
2253     return wxTE_HT_UNKNOWN;
2254 }
2255
2256 // ----------------------------------------------------------------------------
2257 // set/get the controls text
2258 // ----------------------------------------------------------------------------
2259
2260 wxString wxRichTextCtrl::GetValue() const
2261 {
2262     return GetBuffer().GetText();
2263 }
2264
2265 wxString wxRichTextCtrl::GetRange(long from, long to) const
2266 {
2267     // Public API for range is different from internals
2268     return GetBuffer().GetTextForRange(wxRichTextRange(from, to-1));
2269 }
2270
2271 void wxRichTextCtrl::DoSetValue(const wxString& value, int flags)
2272 {
2273     // Don't call Clear here, since it always sends a text updated event
2274     m_buffer.ResetAndClearCommands();
2275     m_buffer.SetDirty(true);
2276     m_caretPosition = -1;
2277     m_caretPositionForDefaultStyle = -2;
2278     m_caretAtLineStart = false;
2279     m_selectionRange.SetRange(-2, -2);
2280
2281     Scroll(0,0);
2282
2283     if (!IsFrozen())
2284     {
2285         LayoutContent();
2286         Refresh(false);
2287     }
2288
2289     if (!value.IsEmpty())
2290     {
2291         // Remove empty paragraph
2292         GetBuffer().Clear();
2293         DoWriteText(value, flags);
2294
2295         // for compatibility, don't move the cursor when doing SetValue()
2296         SetInsertionPoint(0);
2297     }
2298     else
2299     {
2300         // still send an event for consistency
2301         if (flags & SetValue_SendEvent)
2302             wxTextCtrl::SendTextUpdatedEvent(this);
2303     }
2304     DiscardEdits();
2305 }
2306
2307 void wxRichTextCtrl::WriteText(const wxString& value)
2308 {
2309     DoWriteText(value);
2310 }
2311
2312 void wxRichTextCtrl::DoWriteText(const wxString& value, int flags)
2313 {
2314     wxString valueUnix = wxTextFile::Translate(value, wxTextFileType_Unix);
2315
2316     GetBuffer().InsertTextWithUndo(m_caretPosition+1, valueUnix, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
2317
2318     if ( flags & SetValue_SendEvent )
2319         wxTextCtrl::SendTextUpdatedEvent(this);
2320 }
2321
2322 void wxRichTextCtrl::AppendText(const wxString& text)
2323 {
2324     SetInsertionPointEnd();
2325
2326     WriteText(text);
2327 }
2328
2329 /// Write an image at the current insertion point
2330 bool wxRichTextCtrl::WriteImage(const wxImage& image, wxBitmapType bitmapType)
2331 {
2332     wxRichTextImageBlock imageBlock;
2333
2334     wxImage image2 = image;
2335     if (imageBlock.MakeImageBlock(image2, bitmapType))
2336         return WriteImage(imageBlock);
2337
2338     return false;
2339 }
2340
2341 bool wxRichTextCtrl::WriteImage(const wxString& filename, wxBitmapType bitmapType)
2342 {
2343     wxRichTextImageBlock imageBlock;
2344
2345     wxImage image;
2346     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
2347         return WriteImage(imageBlock);
2348
2349     return false;
2350 }
2351
2352 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
2353 {
2354     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
2355 }
2356
2357 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, wxBitmapType bitmapType)
2358 {
2359     if (bitmap.Ok())
2360     {
2361         wxRichTextImageBlock imageBlock;
2362
2363         wxImage image = bitmap.ConvertToImage();
2364         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
2365             return WriteImage(imageBlock);
2366     }
2367
2368     return false;
2369 }
2370
2371 /// Insert a newline (actually paragraph) at the current insertion point.
2372 bool wxRichTextCtrl::Newline()
2373 {
2374     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
2375 }
2376
2377 /// Insert a line break at the current insertion point.
2378 bool wxRichTextCtrl::LineBreak()
2379 {
2380     wxString text;
2381     text = wxRichTextLineBreakChar;
2382     return GetBuffer().InsertTextWithUndo(m_caretPosition+1, text, this);
2383 }
2384
2385 // ----------------------------------------------------------------------------
2386 // Clipboard operations
2387 // ----------------------------------------------------------------------------
2388
2389 void wxRichTextCtrl::Copy()
2390 {
2391     if (CanCopy())
2392     {
2393         wxRichTextRange range = GetInternalSelectionRange();
2394         GetBuffer().CopyToClipboard(range);
2395     }
2396 }
2397
2398 void wxRichTextCtrl::Cut()
2399 {
2400     if (CanCut())
2401     {
2402         wxRichTextRange range = GetInternalSelectionRange();
2403         GetBuffer().CopyToClipboard(range);
2404
2405         DeleteSelectedContent();
2406         LayoutContent();
2407         Refresh(false);
2408     }
2409 }
2410
2411 void wxRichTextCtrl::Paste()
2412 {
2413     if (CanPaste())
2414     {
2415         BeginBatchUndo(_("Paste"));
2416
2417         long newPos = m_caretPosition;
2418         DeleteSelectedContent(& newPos);
2419
2420         GetBuffer().PasteFromClipboard(newPos);
2421
2422         EndBatchUndo();
2423     }
2424 }
2425
2426 void wxRichTextCtrl::DeleteSelection()
2427 {
2428     if (CanDeleteSelection())
2429     {
2430         DeleteSelectedContent();
2431     }
2432 }
2433
2434 bool wxRichTextCtrl::HasSelection() const
2435 {
2436     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
2437 }
2438
2439 bool wxRichTextCtrl::CanCopy() const
2440 {
2441     // Can copy if there's a selection
2442     return HasSelection();
2443 }
2444
2445 bool wxRichTextCtrl::CanCut() const
2446 {
2447     return HasSelection() && IsEditable();
2448 }
2449
2450 bool wxRichTextCtrl::CanPaste() const
2451 {
2452     if ( !IsEditable() )
2453         return false;
2454
2455     return GetBuffer().CanPasteFromClipboard();
2456 }
2457
2458 bool wxRichTextCtrl::CanDeleteSelection() const
2459 {
2460     return HasSelection() && IsEditable();
2461 }
2462
2463
2464 // ----------------------------------------------------------------------------
2465 // Accessors
2466 // ----------------------------------------------------------------------------
2467
2468 void wxRichTextCtrl::SetEditable(bool editable)
2469 {
2470     m_editable = editable;
2471 }
2472
2473 void wxRichTextCtrl::SetInsertionPoint(long pos)
2474 {
2475     SelectNone();
2476
2477     m_caretPosition = pos - 1;
2478
2479     PositionCaret();
2480 }
2481
2482 void wxRichTextCtrl::SetInsertionPointEnd()
2483 {
2484     long pos = GetLastPosition();
2485     SetInsertionPoint(pos);
2486 }
2487
2488 long wxRichTextCtrl::GetInsertionPoint() const
2489 {
2490     return m_caretPosition+1;
2491 }
2492
2493 wxTextPos wxRichTextCtrl::GetLastPosition() const
2494 {
2495     return GetBuffer().GetRange().GetEnd();
2496 }
2497
2498 // If the return values from and to are the same, there is no
2499 // selection.
2500 void wxRichTextCtrl::GetSelection(long* from, long* to) const
2501 {
2502     *from = m_selectionRange.GetStart();
2503     *to = m_selectionRange.GetEnd();
2504     if ((*to) != -1 && (*to) != -2)
2505         (*to) ++;
2506 }
2507
2508 bool wxRichTextCtrl::IsEditable() const
2509 {
2510     return m_editable;
2511 }
2512
2513 // ----------------------------------------------------------------------------
2514 // selection
2515 // ----------------------------------------------------------------------------
2516
2517 void wxRichTextCtrl::SetSelection(long from, long to)
2518 {
2519     // if from and to are both -1, it means (in wxWidgets) that all text should
2520     // be selected.
2521     if ( (from == -1) && (to == -1) )
2522     {
2523         from = 0;
2524         to = GetLastPosition()+1;
2525     }
2526
2527     DoSetSelection(from, to);
2528 }
2529
2530 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
2531 {
2532     if (from == to)
2533     {
2534         SelectNone();
2535     }
2536     else
2537     {
2538         wxRichTextRange oldSelection = m_selectionRange;
2539         m_selectionAnchor = from;
2540         m_selectionRange.SetRange(from, to-1);
2541         if (from > -2)
2542             m_caretPosition = from-1;
2543
2544         RefreshForSelectionChange(oldSelection, m_selectionRange);
2545         PositionCaret();
2546     }
2547 }
2548
2549 // ----------------------------------------------------------------------------
2550 // Editing
2551 // ----------------------------------------------------------------------------
2552
2553 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to),
2554                              const wxString& value)
2555 {
2556     BeginBatchUndo(_("Replace"));
2557
2558     DeleteSelectedContent();
2559
2560     DoWriteText(value, SetValue_SelectionOnly);
2561
2562     EndBatchUndo();
2563 }
2564
2565 void wxRichTextCtrl::Remove(long from, long to)
2566 {
2567     SelectNone();
2568
2569     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to-1), this);
2570
2571     LayoutContent();
2572     if (!IsFrozen())
2573         Refresh(false);
2574 }
2575
2576 bool wxRichTextCtrl::IsModified() const
2577 {
2578     return m_buffer.IsModified();
2579 }
2580
2581 void wxRichTextCtrl::MarkDirty()
2582 {
2583     m_buffer.Modify(true);
2584 }
2585
2586 void wxRichTextCtrl::DiscardEdits()
2587 {
2588     m_caretPositionForDefaultStyle = -2;
2589     m_buffer.Modify(false);
2590     m_buffer.GetCommandProcessor()->ClearCommands();
2591 }
2592
2593 int wxRichTextCtrl::GetNumberOfLines() const
2594 {
2595     return GetBuffer().GetParagraphCount();
2596 }
2597
2598 // ----------------------------------------------------------------------------
2599 // Positions <-> coords
2600 // ----------------------------------------------------------------------------
2601
2602 long wxRichTextCtrl::XYToPosition(long x, long y) const
2603 {
2604     return GetBuffer().XYToPosition(x, y);
2605 }
2606
2607 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2608 {
2609     return GetBuffer().PositionToXY(pos, x, y);
2610 }
2611
2612 // ----------------------------------------------------------------------------
2613 //
2614 // ----------------------------------------------------------------------------
2615
2616 void wxRichTextCtrl::ShowPosition(long pos)
2617 {
2618     if (!IsPositionVisible(pos))
2619         ScrollIntoView(pos-1, WXK_DOWN);
2620 }
2621
2622 int wxRichTextCtrl::GetLineLength(long lineNo) const
2623 {
2624     return GetBuffer().GetParagraphLength(lineNo);
2625 }
2626
2627 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2628 {
2629     return GetBuffer().GetParagraphText(lineNo);
2630 }
2631
2632 // ----------------------------------------------------------------------------
2633 // Undo/redo
2634 // ----------------------------------------------------------------------------
2635
2636 void wxRichTextCtrl::Undo()
2637 {
2638     if (CanUndo())
2639     {
2640         GetCommandProcessor()->Undo();
2641     }
2642 }
2643
2644 void wxRichTextCtrl::Redo()
2645 {
2646     if (CanRedo())
2647     {
2648         GetCommandProcessor()->Redo();
2649     }
2650 }
2651
2652 bool wxRichTextCtrl::CanUndo() const
2653 {
2654     return GetCommandProcessor()->CanUndo();
2655 }
2656
2657 bool wxRichTextCtrl::CanRedo() const
2658 {
2659     return GetCommandProcessor()->CanRedo();
2660 }
2661
2662 // ----------------------------------------------------------------------------
2663 // implementation details
2664 // ----------------------------------------------------------------------------
2665
2666 void wxRichTextCtrl::Command(wxCommandEvent& event)
2667 {
2668     SetValue(event.GetString());
2669     GetEventHandler()->ProcessEvent(event);
2670 }
2671
2672 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2673 {
2674     // By default, load the first file into the text window.
2675     if (event.GetNumberOfFiles() > 0)
2676     {
2677         LoadFile(event.GetFiles()[0]);
2678     }
2679 }
2680
2681 wxSize wxRichTextCtrl::DoGetBestSize() const
2682 {
2683     return wxSize(10, 10);
2684 }
2685
2686 // ----------------------------------------------------------------------------
2687 // standard handlers for standard edit menu events
2688 // ----------------------------------------------------------------------------
2689
2690 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2691 {
2692     Cut();
2693 }
2694
2695 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2696 {
2697     DeleteSelection();
2698 }
2699
2700 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2701 {
2702     Copy();
2703 }
2704
2705 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2706 {
2707     Paste();
2708 }
2709
2710 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2711 {
2712     Undo();
2713 }
2714
2715 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2716 {
2717     Redo();
2718 }
2719
2720 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2721 {
2722     event.Enable( CanCut() );
2723 }
2724
2725 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2726 {
2727     event.Enable( CanCopy() );
2728 }
2729
2730 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2731 {
2732     event.Enable( CanDeleteSelection() );
2733 }
2734
2735 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2736 {
2737     event.Enable( CanPaste() );
2738 }
2739
2740 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2741 {
2742     event.Enable( CanUndo() );
2743     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2744 }
2745
2746 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2747 {
2748     event.Enable( CanRedo() );
2749     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2750 }
2751
2752 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2753 {
2754     SelectAll();
2755 }
2756
2757 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2758 {
2759     event.Enable(GetLastPosition() > 0);
2760 }
2761
2762 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& event)
2763 {
2764     if (event.GetEventObject() != this)
2765     {
2766         event.Skip();
2767         return;
2768     }
2769
2770     if (!m_contextMenu)
2771     {
2772         m_contextMenu = new wxMenu;
2773         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2774         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2775         m_contextMenu->AppendSeparator();
2776         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2777         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2778         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2779         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2780         m_contextMenu->AppendSeparator();
2781         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2782     }
2783     PopupMenu(m_contextMenu);
2784     return;
2785 }
2786
2787 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2788 {
2789     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), wxTextAttr(style));
2790 }
2791
2792 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxTextAttr& style)
2793 {
2794     return GetBuffer().SetStyle(range.ToInternal(), style);
2795 }
2796
2797 // extended style setting operation with flags including:
2798 // wxRICHTEXT_SETSTYLE_WITH_UNDO, wxRICHTEXT_SETSTYLE_OPTIMIZE, wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY.
2799 // see richtextbuffer.h for more details.
2800
2801 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxTextAttr& style, int flags)
2802 {
2803     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2804 }
2805
2806 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2807 {
2808     return GetBuffer().SetDefaultStyle(wxTextAttr(style));
2809 }
2810
2811 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2812 {
2813     return GetBuffer().GetDefaultStyle();
2814 }
2815
2816 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style)
2817 {
2818     return GetBuffer().GetStyle(position, style);
2819 }
2820
2821 // get the common set of styles for the range
2822 bool wxRichTextCtrl::GetStyleForRange(const wxRichTextRange& range, wxTextAttr& style)
2823 {
2824     return GetBuffer().GetStyleForRange(range.ToInternal(), style);
2825 }
2826
2827 /// Get the content (uncombined) attributes for this position.
2828 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttr& style)
2829 {
2830     return GetBuffer().GetUncombinedStyle(position, style);
2831 }
2832
2833 /// Set font, and also the buffer attributes
2834 bool wxRichTextCtrl::SetFont(const wxFont& font)
2835 {
2836     wxControl::SetFont(font);
2837
2838     wxTextAttr attr = GetBuffer().GetAttributes();
2839     attr.SetFont(font);
2840     GetBuffer().SetBasicStyle(attr);
2841
2842     GetBuffer().Invalidate(wxRICHTEXT_ALL);
2843     Refresh(false);
2844
2845     return true;
2846 }
2847
2848 /// Transform logical to physical
2849 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2850 {
2851     wxPoint pt;
2852     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2853
2854     return pt;
2855 }
2856
2857 /// Transform physical to logical
2858 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2859 {
2860     wxPoint pt;
2861     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2862
2863     return pt;
2864 }
2865
2866 /// Position the caret
2867 void wxRichTextCtrl::PositionCaret()
2868 {
2869     if (!GetCaret())
2870         return;
2871
2872     //wxLogDebug(wxT("PositionCaret"));
2873
2874     wxRect caretRect;
2875     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2876     {
2877         wxPoint newPt = caretRect.GetPosition();
2878         wxSize newSz = caretRect.GetSize();
2879         wxPoint pt = GetPhysicalPoint(newPt);
2880         if (GetCaret()->GetPosition() != pt || GetCaret()->GetSize() != newSz)
2881         {
2882             GetCaret()->Hide();
2883             if (GetCaret()->GetSize() != newSz)
2884                 GetCaret()->SetSize(newSz);
2885             GetCaret()->Move(pt);
2886             GetCaret()->Show();
2887         }
2888     }
2889 }
2890
2891 /// Get the caret height and position for the given character position
2892 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2893 {
2894     wxClientDC dc(this);
2895     dc.SetFont(GetFont());
2896
2897     PrepareDC(dc);
2898
2899     wxPoint pt;
2900     int height = 0;
2901
2902     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2903     {
2904         // Caret height can't be zero
2905         if (height == 0)
2906             height = dc.GetCharHeight();
2907
2908         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2909         return true;
2910     }
2911
2912     return false;
2913 }
2914
2915 /// Gets the line for the visible caret position. If the caret is
2916 /// shown at the very end of the line, it means the next character is actually
2917 /// on the following line. So let's get the line we're expecting to find
2918 /// if this is the case.
2919 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2920 {
2921     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2922     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2923     if (line)
2924     {
2925         wxRichTextRange lineRange = line->GetAbsoluteRange();
2926         if (caretPosition == lineRange.GetStart()-1 &&
2927             (para->GetRange().GetStart() != lineRange.GetStart()))
2928         {
2929             if (!m_caretAtLineStart)
2930                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2931         }
2932     }
2933     return line;
2934 }
2935
2936
2937 /// Move the caret to the given character position
2938 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2939 {
2940     if (GetBuffer().GetDirty())
2941         LayoutContent();
2942
2943     if (pos <= GetBuffer().GetRange().GetEnd())
2944     {
2945         SetCaretPosition(pos, showAtLineStart);
2946
2947         PositionCaret();
2948
2949         return true;
2950     }
2951     else
2952         return false;
2953 }
2954
2955 /// Layout the buffer: which we must do before certain operations, such as
2956 /// setting the caret position.
2957 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2958 {
2959     if (GetBuffer().GetDirty() || onlyVisibleRect)
2960     {
2961         wxRect availableSpace(GetClientSize());
2962         if (availableSpace.width == 0)
2963             availableSpace.width = 10;
2964         if (availableSpace.height == 0)
2965             availableSpace.height = 10;
2966
2967         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2968         if (onlyVisibleRect)
2969         {
2970             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2971             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2972         }
2973
2974         wxClientDC dc(this);
2975         dc.SetFont(GetFont());
2976
2977         PrepareDC(dc);
2978
2979         GetBuffer().Defragment();
2980         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2981         GetBuffer().Layout(dc, availableSpace, flags);
2982         GetBuffer().SetDirty(false);
2983
2984         if (!IsFrozen())
2985             SetupScrollbars();
2986     }
2987
2988     return true;
2989 }
2990
2991 /// Is all of the selection bold?
2992 bool wxRichTextCtrl::IsSelectionBold()
2993 {
2994     if (HasSelection())
2995     {
2996         wxTextAttr attr;
2997         wxRichTextRange range = GetSelectionRange();
2998         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2999         attr.SetFontWeight(wxBOLD);
3000
3001         return HasCharacterAttributes(range, attr);
3002     }
3003     else
3004     {
3005         // If no selection, then we need to combine current style with default style
3006         // to see what the effect would be if we started typing.
3007         wxTextAttr attr;
3008         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
3009
3010         long pos = GetAdjustedCaretPosition(GetCaretPosition());
3011         if (GetStyle(pos, attr))
3012         {
3013             if (IsDefaultStyleShowing())
3014                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
3015             return attr.GetFontWeight() == wxBOLD;
3016         }
3017     }
3018     return false;
3019 }
3020
3021 /// Is all of the selection italics?
3022 bool wxRichTextCtrl::IsSelectionItalics()
3023 {
3024     if (HasSelection())
3025     {
3026         wxRichTextRange range = GetSelectionRange();
3027         wxTextAttr attr;
3028         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
3029         attr.SetFontStyle(wxITALIC);
3030
3031         return HasCharacterAttributes(range, attr);
3032     }
3033     else
3034     {
3035         // If no selection, then we need to combine current style with default style
3036         // to see what the effect would be if we started typing.
3037         wxTextAttr attr;
3038         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
3039
3040         long pos = GetAdjustedCaretPosition(GetCaretPosition());
3041         if (GetStyle(pos, attr))
3042         {
3043             if (IsDefaultStyleShowing())
3044                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
3045             return attr.GetFontStyle() == wxITALIC;
3046         }
3047     }
3048     return false;
3049 }
3050
3051 /// Is all of the selection underlined?
3052 bool wxRichTextCtrl::IsSelectionUnderlined()
3053 {
3054     if (HasSelection())
3055     {
3056         wxRichTextRange range = GetSelectionRange();
3057         wxTextAttr attr;
3058         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
3059         attr.SetFontUnderlined(true);
3060
3061         return HasCharacterAttributes(range, attr);
3062     }
3063     else
3064     {
3065         // If no selection, then we need to combine current style with default style
3066         // to see what the effect would be if we started typing.
3067         wxTextAttr attr;
3068         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
3069         long pos = GetAdjustedCaretPosition(GetCaretPosition());
3070
3071         if (GetStyle(pos, attr))
3072         {
3073             if (IsDefaultStyleShowing())
3074                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
3075             return attr.GetFontUnderlined();
3076         }
3077     }
3078     return false;
3079 }
3080
3081 /// Apply bold to the selection
3082 bool wxRichTextCtrl::ApplyBoldToSelection()
3083 {
3084     wxTextAttr attr;
3085     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
3086     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
3087
3088     if (HasSelection())
3089         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
3090     else
3091     {
3092         wxRichTextAttr current = GetDefaultStyleEx();
3093         current.Apply(attr);
3094         SetAndShowDefaultStyle(current);
3095     }
3096     return true;
3097 }
3098
3099 /// Apply italic to the selection
3100 bool wxRichTextCtrl::ApplyItalicToSelection()
3101 {
3102     wxTextAttr attr;
3103     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
3104     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
3105
3106     if (HasSelection())
3107         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
3108     else
3109     {
3110         wxRichTextAttr current = GetDefaultStyleEx();
3111         current.Apply(attr);
3112         SetAndShowDefaultStyle(current);
3113     }
3114     return true;
3115 }
3116
3117 /// Apply underline to the selection
3118 bool wxRichTextCtrl::ApplyUnderlineToSelection()
3119 {
3120     wxTextAttr attr;
3121     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
3122     attr.SetFontUnderlined(!IsSelectionUnderlined());
3123
3124     if (HasSelection())
3125         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
3126     else
3127     {
3128         wxRichTextAttr current = GetDefaultStyleEx();
3129         current.Apply(attr);
3130         SetAndShowDefaultStyle(current);
3131     }
3132     return true;
3133 }
3134
3135 /// Is all of the selection aligned according to the specified flag?
3136 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment)
3137 {
3138     wxRichTextRange range;
3139     if (HasSelection())
3140         range = GetSelectionRange();
3141     else
3142         range = wxRichTextRange(GetCaretPosition()+1, GetCaretPosition()+2);
3143
3144     wxTextAttr attr;
3145     attr.SetAlignment(alignment);
3146
3147     return HasParagraphAttributes(range, attr);
3148 }
3149
3150 /// Apply alignment to the selection
3151 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
3152 {
3153     wxTextAttr attr;
3154     attr.SetAlignment(alignment);
3155     if (HasSelection())
3156         return SetStyle(GetSelectionRange(), attr);
3157     else
3158     {
3159         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
3160         if (para)
3161             return SetStyleEx(para->GetRange().FromInternal(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY);
3162     }
3163     return true;
3164 }
3165
3166 /// Apply a named style to the selection
3167 bool wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
3168 {
3169     // Flags are defined within each definition, so only certain
3170     // attributes are applied.
3171     wxTextAttr attr(GetStyleSheet() ? def->GetStyleMergedWithBase(GetStyleSheet()) : def->GetStyle());
3172
3173     int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_RESET;
3174
3175     if (def->IsKindOf(CLASSINFO(wxRichTextListStyleDefinition)))
3176     {
3177         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
3178
3179         wxRichTextRange range;
3180
3181         if (HasSelection())
3182             range = GetSelectionRange();
3183         else
3184         {
3185             long pos = GetAdjustedCaretPosition(GetCaretPosition());
3186             range = wxRichTextRange(pos, pos+1);
3187         }
3188
3189         return SetListStyle(range, (wxRichTextListStyleDefinition*) def, flags);
3190     }
3191
3192     // Make sure the attr has the style name
3193     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
3194     {
3195         attr.SetParagraphStyleName(def->GetName());
3196
3197         // If applying a paragraph style, we only want the paragraph nodes to adopt these
3198         // attributes, and not the leaf nodes. This will allow the content (e.g. text)
3199         // to change its style independently.
3200         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
3201     }
3202     else
3203         attr.SetCharacterStyleName(def->GetName());
3204
3205     if (HasSelection())
3206         return SetStyleEx(GetSelectionRange(), attr, flags);
3207     else
3208     {
3209         wxRichTextAttr current = GetDefaultStyleEx();
3210         current.Apply(attr);
3211         SetAndShowDefaultStyle(current);
3212         return true;
3213     }
3214 }
3215
3216 /// Apply the style sheet to the buffer, for example if the styles have changed.
3217 bool wxRichTextCtrl::ApplyStyleSheet(wxRichTextStyleSheet* styleSheet)
3218 {
3219     if (!styleSheet)
3220         styleSheet = GetBuffer().GetStyleSheet();
3221     if (!styleSheet)
3222         return false;
3223
3224     if (GetBuffer().ApplyStyleSheet(styleSheet))
3225     {
3226         GetBuffer().Invalidate(wxRICHTEXT_ALL);
3227         Refresh(false);
3228         return true;
3229     }
3230     else
3231         return false;
3232 }
3233
3234 /// Sets the default style to the style under the cursor
3235 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
3236 {
3237     wxTextAttr attr;
3238     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
3239
3240     // If at the start of a paragraph, use the next position.
3241     long pos = GetAdjustedCaretPosition(GetCaretPosition());
3242
3243     if (GetUncombinedStyle(pos, attr))
3244     {
3245         SetDefaultStyle(attr);
3246         return true;
3247     }
3248
3249     return false;
3250 }
3251
3252 /// Returns the first visible position in the current view
3253 long wxRichTextCtrl::GetFirstVisiblePosition() const
3254 {
3255     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
3256     if (line)
3257         return line->GetAbsoluteRange().GetStart();
3258     else
3259         return 0;
3260 }
3261
3262 /// Get the first visible point in the window
3263 wxPoint wxRichTextCtrl::GetFirstVisiblePoint() const
3264 {
3265     int ppuX, ppuY;
3266     int startXUnits, startYUnits;
3267
3268     GetScrollPixelsPerUnit(& ppuX, & ppuY);
3269     GetViewStart(& startXUnits, & startYUnits);
3270
3271     return wxPoint(startXUnits * ppuX, startYUnits * ppuY);
3272 }
3273
3274 /// The adjusted caret position is the character position adjusted to take
3275 /// into account whether we're at the start of a paragraph, in which case
3276 /// style information should be taken from the next position, not current one.
3277 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
3278 {
3279     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
3280
3281     if (para && (caretPos+1 == para->GetRange().GetStart()))
3282         caretPos ++;
3283     return caretPos;
3284 }
3285
3286 /// Get/set the selection range in character positions. -1, -1 means no selection.
3287 /// The range is in API convention, i.e. a single character selection is denoted
3288 /// by (n, n+1)
3289 wxRichTextRange wxRichTextCtrl::GetSelectionRange() const
3290 {
3291     wxRichTextRange range = GetInternalSelectionRange();
3292     if (range != wxRichTextRange(-2,-2) && range != wxRichTextRange(-1,-1))
3293         range.SetEnd(range.GetEnd() + 1);
3294     return range;
3295 }
3296
3297 void wxRichTextCtrl::SetSelectionRange(const wxRichTextRange& range)
3298 {
3299     wxRichTextRange range1(range);
3300     if (range1 != wxRichTextRange(-2,-2) && range1 != wxRichTextRange(-1,-1) )
3301         range1.SetEnd(range1.GetEnd() - 1);
3302
3303     wxASSERT( range1.GetStart() > range1.GetEnd() );
3304
3305     SetInternalSelectionRange(range1);
3306 }
3307
3308 /// Set list style
3309 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3310 {
3311     return GetBuffer().SetListStyle(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3312 }
3313
3314 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3315 {
3316     return GetBuffer().SetListStyle(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3317 }
3318
3319 /// Clear list for given range
3320 bool wxRichTextCtrl::ClearListStyle(const wxRichTextRange& range, int flags)
3321 {
3322     return GetBuffer().ClearListStyle(range.ToInternal(), flags);
3323 }
3324
3325 /// Number/renumber any list elements in the given range
3326 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3327 {
3328     return GetBuffer().NumberList(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3329 }
3330
3331 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3332 {
3333     return GetBuffer().NumberList(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3334 }
3335
3336 /// Promote the list items within the given range. promoteBy can be a positive or negative number, e.g. 1 or -1
3337 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int specifiedLevel)
3338 {
3339     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), def, flags, specifiedLevel);
3340 }
3341
3342 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, const wxString& defName, int flags, int specifiedLevel)
3343 {
3344     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), defName, flags, specifiedLevel);
3345 }
3346
3347 /// Deletes the content in the given range
3348 bool wxRichTextCtrl::Delete(const wxRichTextRange& range)
3349 {
3350     return GetBuffer().DeleteRangeWithUndo(range.ToInternal(), this);
3351 }
3352
3353 const wxArrayString& wxRichTextCtrl::GetAvailableFontNames()
3354 {
3355     if (sm_availableFontNames.GetCount() == 0)
3356     {
3357         sm_availableFontNames = wxFontEnumerator::GetFacenames();
3358         sm_availableFontNames.Sort();
3359     }
3360     return sm_availableFontNames;
3361 }
3362
3363 void wxRichTextCtrl::ClearAvailableFontNames()
3364 {
3365     sm_availableFontNames.Clear();
3366 }
3367
3368 void wxRichTextCtrl::OnSysColourChanged(wxSysColourChangedEvent& WXUNUSED(event))
3369 {
3370     //wxLogDebug(wxT("wxRichTextCtrl::OnSysColourChanged"));
3371
3372     wxTextAttrEx basicStyle = GetBasicStyle();
3373     basicStyle.SetTextColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
3374     SetBasicStyle(basicStyle);
3375     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
3376
3377     Refresh();
3378 }
3379
3380 // Refresh the area affected by a selection change
3381 bool wxRichTextCtrl::RefreshForSelectionChange(const wxRichTextRange& oldSelection, const wxRichTextRange& newSelection)
3382 {
3383     // Calculate the refresh rectangle - just the affected lines
3384     long firstPos, lastPos;
3385     if (oldSelection.GetStart() == -2 && newSelection.GetStart() != -2)
3386     {
3387         firstPos = newSelection.GetStart();
3388         lastPos = newSelection.GetEnd();
3389     }
3390     else if (oldSelection.GetStart() != -2 && newSelection.GetStart() == -2)
3391     {
3392         firstPos = oldSelection.GetStart();
3393         lastPos = oldSelection.GetEnd();
3394     }
3395     else if (oldSelection.GetStart() == -2 && newSelection.GetStart() == -2)
3396     {
3397         return false;
3398     }
3399     else
3400     {
3401         firstPos = wxMin(oldSelection.GetStart(), newSelection.GetStart());
3402         lastPos = wxMax(oldSelection.GetEnd(), newSelection.GetEnd());
3403     }
3404
3405     wxRichTextLine* firstLine = GetBuffer().GetLineAtPosition(firstPos);
3406     wxRichTextLine* lastLine = GetBuffer().GetLineAtPosition(lastPos);
3407
3408     if (firstLine && lastLine)
3409     {
3410         wxSize clientSize = GetClientSize();
3411         wxPoint pt1 = GetPhysicalPoint(firstLine->GetAbsolutePosition());
3412         wxPoint pt2 = GetPhysicalPoint(lastLine->GetAbsolutePosition()) + wxPoint(0, lastLine->GetSize().y);
3413
3414         pt1.x = 0;
3415         pt1.y = wxMax(0, pt1.y);
3416         pt2.x = 0;
3417         pt2.y = wxMin(clientSize.y, pt2.y);
3418
3419         wxRect rect(pt1, wxSize(clientSize.x, pt2.y - pt1.y));
3420         RefreshRect(rect, false);
3421     }
3422     else
3423         Refresh(false);
3424
3425     return true;
3426 }
3427
3428 #if wxRICHTEXT_USE_OWN_CARET
3429
3430 // ----------------------------------------------------------------------------
3431 // initialization and destruction
3432 // ----------------------------------------------------------------------------
3433
3434 void wxRichTextCaret::Init()
3435 {
3436     m_hasFocus = true;
3437
3438     m_xOld =
3439     m_yOld = -1;
3440     m_richTextCtrl = NULL;
3441     m_needsUpdate = false;
3442 }
3443
3444 wxRichTextCaret::~wxRichTextCaret()
3445 {
3446 }
3447
3448 // ----------------------------------------------------------------------------
3449 // showing/hiding/moving the caret (base class interface)
3450 // ----------------------------------------------------------------------------
3451
3452 void wxRichTextCaret::DoShow()
3453 {
3454     Refresh();
3455 }
3456
3457 void wxRichTextCaret::DoHide()
3458 {
3459     Refresh();
3460 }
3461
3462 void wxRichTextCaret::DoMove()
3463 {
3464     if (IsVisible())
3465     {
3466         Refresh();
3467
3468         if (m_xOld != -1 && m_yOld != -1)
3469         {
3470             if (m_richTextCtrl)
3471             {
3472                 wxRect rect(GetPosition(), GetSize());
3473                 m_richTextCtrl->RefreshRect(rect, false);
3474             }
3475         }
3476     }
3477
3478     m_xOld = m_x;
3479     m_yOld = m_y;
3480 }
3481
3482 void wxRichTextCaret::DoSize()
3483 {
3484     int countVisible = m_countVisible;
3485     if (countVisible > 0)
3486     {
3487         m_countVisible = 0;
3488         DoHide();
3489     }
3490
3491     if (countVisible > 0)
3492     {
3493         m_countVisible = countVisible;
3494         DoShow();
3495     }
3496 }
3497
3498 // ----------------------------------------------------------------------------
3499 // handling the focus
3500 // ----------------------------------------------------------------------------
3501
3502 void wxRichTextCaret::OnSetFocus()
3503 {
3504     m_hasFocus = true;
3505
3506     if ( IsVisible() )
3507         Refresh();
3508 }
3509
3510 void wxRichTextCaret::OnKillFocus()
3511 {
3512     m_hasFocus = false;
3513 }
3514
3515 // ----------------------------------------------------------------------------
3516 // drawing the caret
3517 // ----------------------------------------------------------------------------
3518
3519 void wxRichTextCaret::Refresh()
3520 {
3521     if (m_richTextCtrl)
3522     {
3523         wxRect rect(GetPosition(), GetSize());
3524         m_richTextCtrl->RefreshRect(rect, false);
3525     }
3526 }
3527
3528 void wxRichTextCaret::DoDraw(wxDC *dc)
3529 {
3530     dc->SetPen( *wxBLACK_PEN );
3531
3532     dc->SetBrush(*(m_hasFocus ? wxBLACK_BRUSH : wxTRANSPARENT_BRUSH));
3533     dc->SetPen(*wxBLACK_PEN);
3534
3535     // VZ: unfortunately, the rectangle comes out a pixel smaller when this is
3536     //     done under wxGTK - no idea why
3537     //dc->SetLogicalFunction(wxINVERT);
3538
3539     wxPoint pt(m_x, m_y);
3540
3541     if (m_richTextCtrl)
3542     {
3543         pt = m_richTextCtrl->GetLogicalPoint(pt);
3544     }
3545     dc->DrawRectangle(pt.x, pt.y, m_width, m_height);
3546 }
3547 #endif
3548     // wxRICHTEXT_USE_OWN_CARET
3549
3550 #endif
3551     // wxUSE_RICHTEXT