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
  36 // DLL options compatibility check:
  37 #include "wx/app.h"
  38 WX_CHECK_BUILD_OPTIONS("wxRichTextCtrl")
  39
  40 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_CLICK)
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK)
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RETURN)
  45 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CHARACTER)
  46 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_DELETE)
  47
  48 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_REPLACING)
  49 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_REPLACED)
  50 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_CHANGING)
  51 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLESHEET_CHANGED)
  52
  53 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CONTENT_INSERTED)
  54 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_CONTENT_DELETED)
  55 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_STYLE_CHANGED)
  56 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_SELECTION_CHANGED)
  57 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_BUFFER_RESET)
  58
  59 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
  60
  61 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
  62
  63 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
  64     EVT_PAINT(wxRichTextCtrl::OnPaint)
  65     EVT_ERASE_BACKGROUND(wxRichTextCtrl::OnEraseBackground)
  66     EVT_IDLE(wxRichTextCtrl::OnIdle)
  67     EVT_SCROLLWIN(wxRichTextCtrl::OnScroll)
  68     EVT_LEFT_DOWN(wxRichTextCtrl::OnLeftClick)
  69     EVT_MOTION(wxRichTextCtrl::OnMoveMouse)
  70     EVT_LEFT_UP(wxRichTextCtrl::OnLeftUp)
  71     EVT_RIGHT_DOWN(wxRichTextCtrl::OnRightClick)
  72     EVT_MIDDLE_DOWN(wxRichTextCtrl::OnMiddleClick)
  73     EVT_LEFT_DCLICK(wxRichTextCtrl::OnLeftDClick)
  74     EVT_CHAR(wxRichTextCtrl::OnChar)
  75     EVT_SIZE(wxRichTextCtrl::OnSize)
  76     EVT_SET_FOCUS(wxRichTextCtrl::OnSetFocus)
  77     EVT_KILL_FOCUS(wxRichTextCtrl::OnKillFocus)
  78     EVT_MOUSE_CAPTURE_LOST(wxRichTextCtrl::OnCaptureLost)
  79     EVT_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
  80     EVT_SYS_COLOUR_CHANGED(wxRichTextCtrl::OnSysColourChanged)
  81
  82     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
  83     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
  84
  85     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
  86     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
  87
  88     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
  89     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
  90
  91     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
  92     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
  93
  94     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
  95     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
  96
  97     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
  98     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
  99
 100     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
 101     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
 102 END_EVENT_TABLE()
 103
 104 /*!
 105  * wxRichTextCtrl
 106  */
 107
 108 wxArrayString wxRichTextCtrl::sm_availableFontNames;
 109
 110 wxRichTextCtrl::wxRichTextCtrl()
 111               : wxScrollHelper(this)
 112 {
 113     Init();
 114 }
 115
 116 wxRichTextCtrl::wxRichTextCtrl(wxWindow* parent,
 117                                wxWindowID id,
 118                                const wxString& value,
 119                                const wxPoint& pos,
 120                                const wxSize& size,
 121                                long style,
 122                                const wxValidator& validator,
 123                                const wxString& name)
 124               : wxScrollHelper(this)
 125 {
 126     Init();
 127     Create(parent, id, value, pos, size, style, validator, name);
 128 }
 129
 130 /// Creation
 131 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style,
 132                              const wxValidator& validator, const wxString& name)
 133 {
 134     if (!wxControl::Create(parent, id, pos, size,
 135                            style|wxFULL_REPAINT_ON_RESIZE,
 136                            validator, name))
 137         return false;
 138
 139     if (!GetFont().Ok())
 140     {
 141         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 142     }
 143
 144     if (style & wxTE_READONLY)
 145         SetEditable(false);
 146
 147     // The base attributes must all have default values
 148     wxTextAttr attributes;
 149     attributes.SetFont(GetFont());
 150     attributes.SetTextColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
 151     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 152     attributes.SetLineSpacing(10);
 153     attributes.SetParagraphSpacingAfter(10);
 154     attributes.SetParagraphSpacingBefore(0);
 155     attributes.SetTextEffects(0);
 156     attributes.SetTextEffectFlags(wxTEXT_ATTR_EFFECT_STRIKETHROUGH|wxTEXT_ATTR_EFFECT_CAPITALS);
 157
 158     SetBasicStyle(attributes);
 159
 160     // The default attributes will be merged with base attributes, so
 161     // can be empty to begin with
 162     wxTextAttr defaultAttributes;
 163     SetDefaultStyle(defaultAttributes);
 164
 165     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 166     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 167
 168     GetBuffer().Reset();
 169     GetBuffer().SetRichTextCtrl(this);
 170
 171     SetCaret(new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16));
 172     GetCaret()->Show();
 173
 174     // Tell the sizers to use the given or best size
 175     SetInitialSize(size);
 176
 177 #if wxRICHTEXT_BUFFERED_PAINTING
 178     // Create a buffer
 179     RecreateBuffer(size);
 180 #endif
 181
 182     m_textCursor = wxCursor(wxCURSOR_IBEAM);
 183     m_urlCursor = wxCursor(wxCURSOR_HAND);
 184
 185     SetCursor(m_textCursor);
 186
 187     if (!value.IsEmpty())
 188         SetValue(value);
 189
 190     GetBuffer().AddEventHandler(this);
 191
 192     return true;
 193 }
 194
 195 wxRichTextCtrl::~wxRichTextCtrl()
 196 {
 197     GetBuffer().RemoveEventHandler(this);
 198
 199     delete m_contextMenu;
 200 }
 201
 202 /// Member initialisation
 203 void wxRichTextCtrl::Init()
 204 {
 205     m_contextMenu = NULL;
 206     m_caret = NULL;
 207     m_caretPosition = -1;
 208     m_selectionRange.SetRange(-2, -2);
 209     m_selectionAnchor = -2;
 210     m_editable = true;
 211     m_caretAtLineStart = false;
 212     m_dragging = false;
 213     m_fullLayoutRequired = false;
 214     m_fullLayoutTime = 0;
 215     m_fullLayoutSavedPosition = 0;
 216     m_delayedLayoutThreshold = wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD;
 217     m_caretPositionForDefaultStyle = -2;
 218 }
 219
 220 void wxRichTextCtrl::DoThaw()
 221 {
 222     if (GetBuffer().GetDirty())
 223         LayoutContent();
 224     else
 225         SetupScrollbars();
 226     Refresh(false);
 227 }
 228
 229 /// Clear all text
 230 void wxRichTextCtrl::Clear()
 231 {
 232     m_buffer.ResetAndClearCommands();
 233     m_buffer.SetDirty(true);
 234     m_caretPosition = -1;
 235     m_caretPositionForDefaultStyle = -2;
 236     m_caretAtLineStart = false;
 237     m_selectionRange.SetRange(-2, -2);
 238
 239     Scroll(0,0);
 240
 241     if (!IsFrozen())
 242     {
 243         LayoutContent();
 244         Refresh(false);
 245     }
 246
 247     wxTextCtrl::SendTextUpdatedEvent(this);
 248 }
 249
 250 /// Painting
 251 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 252 {
 253     if (GetCaret() && GetCaret()->IsVisible())
 254         GetCaret()->Hide();
 255
 256     {
 257 #if wxRICHTEXT_BUFFERED_PAINTING
 258         wxBufferedPaintDC dc(this, m_bufferBitmap);
 259 #else
 260         wxPaintDC dc(this);
 261 #endif
 262
 263         if (IsFrozen())
 264             return;
 265
 266         PrepareDC(dc);
 267
 268         dc.SetFont(GetFont());
 269
 270         // Paint the background
 271         PaintBackground(dc);
 272
 273         // wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 274
 275         wxRect drawingArea(GetUpdateRegion().GetBox());
 276         drawingArea.SetPosition(GetLogicalPoint(drawingArea.GetPosition()));
 277
 278         wxRect availableSpace(GetClientSize());
 279         if (GetBuffer().GetDirty())
 280         {
 281             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 282             GetBuffer().SetDirty(false);
 283             SetupScrollbars();
 284         }
 285
 286         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetInternalSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 287     }
 288
 289     if (GetCaret() && !GetCaret()->IsVisible())
 290         GetCaret()->Show();
 291
 292     PositionCaret();
 293 }
 294
 295 // Empty implementation, to prevent flicker
 296 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 297 {
 298 }
 299
 300 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 301 {
 302     if (GetCaret())
 303     {
 304         if (!GetCaret()->IsVisible())
 305             GetCaret()->Show();
 306         PositionCaret();
 307     }
 308
 309     // if (!IsFrozen())
 310     //    Refresh(false);
 311 }
 312
 313 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 314 {
 315     if (GetCaret() && GetCaret()->IsVisible())
 316         GetCaret()->Hide();
 317
 318     // if (!IsFrozen())
 319     //    Refresh(false);
 320 }
 321
 322 void wxRichTextCtrl::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
 323 {
 324     m_dragging = false;
 325 }
 326
 327 /// Left-click
 328 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 329 {
 330     SetFocus();
 331
 332     wxClientDC dc(this);
 333     PrepareDC(dc);
 334     dc.SetFont(GetFont());
 335
 336     long position = 0;
 337     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 338
 339     if (hit != wxRICHTEXT_HITTEST_NONE)
 340     {
 341         m_dragStart = event.GetLogicalPosition(dc);
 342         m_dragging = true;
 343         CaptureMouse();
 344
 345         bool caretAtLineStart = false;
 346
 347         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 348         {
 349             // If we're at the start of a line (but not first in para)
 350             // then we should keep the caret showing at the start of the line
 351             // by showing the m_caretAtLineStart flag.
 352             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 353             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 354
 355             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 356                 caretAtLineStart = true;
 357             position --;
 358         }
 359
 360         long oldCaretPos = m_caretPosition;
 361
 362         MoveCaret(position, caretAtLineStart);
 363         SetDefaultStyleToCursorStyle();
 364
 365         if (event.ShiftDown())
 366         {
 367             if (m_selectionRange.GetStart() == -2)
 368                 ExtendSelection(oldCaretPos, m_caretPosition, wxRICHTEXT_SHIFT_DOWN);
 369             else
 370                 ExtendSelection(m_caretPosition, m_caretPosition, wxRICHTEXT_SHIFT_DOWN);
 371         }
 372         else
 373             SelectNone();
 374     }
 375
 376     event.Skip();
 377 }
 378
 379 /// Left-up
 380 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& event)
 381 {
 382     if (m_dragging)
 383     {
 384         m_dragging = false;
 385         if (GetCapture() == this)
 386             ReleaseMouse();
 387
 388         // See if we clicked on a URL
 389         wxClientDC dc(this);
 390         PrepareDC(dc);
 391         dc.SetFont(GetFont());
 392
 393         long position = 0;
 394         wxPoint logicalPt = event.GetLogicalPosition(dc);
 395         int hit = GetBuffer().HitTest(dc, logicalPt, position);
 396
 397         if ((hit != wxRICHTEXT_HITTEST_NONE) && !(hit & wxRICHTEXT_HITTEST_OUTSIDE))
 398         {
 399             wxRichTextEvent cmdEvent(
 400                 wxEVT_COMMAND_RICHTEXT_LEFT_CLICK,
 401                 GetId());
 402             cmdEvent.SetEventObject(this);
 403             cmdEvent.SetPosition(m_caretPosition+1);
 404
 405             if (!GetEventHandler()->ProcessEvent(cmdEvent))
 406             {
 407                 wxTextAttr attr;
 408                 if (GetStyle(position, attr))
 409                 {
 410                     if (attr.HasFlag(wxTEXT_ATTR_URL))
 411                     {
 412                         wxString urlTarget = attr.GetURL();
 413                         if (!urlTarget.IsEmpty())
 414                         {
 415                             wxMouseEvent mouseEvent(event);
 416
 417                             long startPos = 0, endPos = 0;
 418                             wxRichTextObject* obj = GetBuffer().GetLeafObjectAtPosition(position);
 419                             if (obj)
 420                             {
 421                                 startPos = obj->GetRange().GetStart();
 422                                 endPos = obj->GetRange().GetEnd();
 423                             }
 424
 425                             wxTextUrlEvent urlEvent(GetId(), mouseEvent, startPos, endPos);
 426                             InitCommandEvent(urlEvent);
 427
 428                             urlEvent.SetString(urlTarget);
 429
 430                             GetEventHandler()->ProcessEvent(urlEvent);
 431                         }
 432                     }
 433                 }
 434             }
 435         }
 436     }
 437 }
 438
 439 /// Left-click
 440 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 441 {
 442     wxClientDC dc(this);
 443     PrepareDC(dc);
 444     dc.SetFont(GetFont());
 445
 446     long position = 0;
 447     wxPoint logicalPt = event.GetLogicalPosition(dc);
 448     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 449
 450     // See if we need to change the cursor
 451
 452     {
 453         if (hit != wxRICHTEXT_HITTEST_NONE && !(hit & wxRICHTEXT_HITTEST_OUTSIDE))
 454         {
 455             wxTextAttr attr;
 456             if (GetStyle(position, attr))
 457             {
 458                 if (attr.HasFlag(wxTEXT_ATTR_URL))
 459                 {
 460                     SetCursor(m_urlCursor);
 461                 }
 462                 else if (!attr.HasFlag(wxTEXT_ATTR_URL))
 463                 {
 464                     SetCursor(m_textCursor);
 465                 }
 466             }
 467         }
 468         else
 469             SetCursor(m_textCursor);
 470     }
 471
 472     if (!event.Dragging())
 473     {
 474         event.Skip();
 475         return;
 476     }
 477
 478     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 479     {
 480         // TODO: test closeness
 481
 482         bool caretAtLineStart = false;
 483
 484         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 485         {
 486             // If we're at the start of a line (but not first in para)
 487             // then we should keep the caret showing at the start of the line
 488             // by showing the m_caretAtLineStart flag.
 489             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 490             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 491
 492             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 493                 caretAtLineStart = true;
 494             position --;
 495         }
 496
 497         if (m_caretPosition != position)
 498         {
 499             ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 500
 501             MoveCaret(position, caretAtLineStart);
 502             SetDefaultStyleToCursorStyle();
 503         }
 504     }
 505 }
 506
 507 /// Right-click
 508 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 509 {
 510     SetFocus();
 511
 512     wxRichTextEvent cmdEvent(
 513         wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK,
 514         GetId());
 515     cmdEvent.SetEventObject(this);
 516     cmdEvent.SetPosition(m_caretPosition+1);
 517
 518     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 519         event.Skip();
 520 }
 521
 522 /// Left-double-click
 523 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& WXUNUSED(event))
 524 {
 525     wxRichTextEvent cmdEvent(
 526         wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK,
 527         GetId());
 528     cmdEvent.SetEventObject(this);
 529     cmdEvent.SetPosition(m_caretPosition+1);
 530
 531     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 532     {
 533         SelectWord(GetCaretPosition()+1);
 534     }
 535 }
 536
 537 /// Middle-click
 538 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 539 {
 540     wxRichTextEvent cmdEvent(
 541         wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK,
 542         GetId());
 543     cmdEvent.SetEventObject(this);
 544     cmdEvent.SetPosition(m_caretPosition+1);
 545
 546     if (!GetEventHandler()->ProcessEvent(cmdEvent))
 547         event.Skip();
 548 }
 549
 550 /// Key press
 551 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 552 {
 553     int flags = 0;
 554     if (event.CmdDown())
 555         flags |= wxRICHTEXT_CTRL_DOWN;
 556     if (event.ShiftDown())
 557         flags |= wxRICHTEXT_SHIFT_DOWN;
 558     if (event.AltDown())
 559         flags |= wxRICHTEXT_ALT_DOWN;
 560
 561     if (event.GetKeyCode() == WXK_LEFT ||
 562         event.GetKeyCode() == WXK_RIGHT ||
 563         event.GetKeyCode() == WXK_UP ||
 564         event.GetKeyCode() == WXK_DOWN ||
 565         event.GetKeyCode() == WXK_HOME ||
 566         event.GetKeyCode() == WXK_PAGEUP ||
 567         event.GetKeyCode() == WXK_PAGEDOWN ||
 568         event.GetKeyCode() == WXK_END ||
 569
 570         event.GetKeyCode() == WXK_NUMPAD_LEFT ||
 571         event.GetKeyCode() == WXK_NUMPAD_RIGHT ||
 572         event.GetKeyCode() == WXK_NUMPAD_UP ||
 573         event.GetKeyCode() == WXK_NUMPAD_DOWN ||
 574         event.GetKeyCode() == WXK_NUMPAD_HOME ||
 575         event.GetKeyCode() == WXK_NUMPAD_PAGEUP ||
 576         event.GetKeyCode() == WXK_NUMPAD_PAGEDOWN ||
 577         event.GetKeyCode() == WXK_NUMPAD_END)
 578     {
 579         KeyboardNavigate(event.GetKeyCode(), flags);
 580         return;
 581     }
 582
 583     // all the other keys modify the controls contents which shouldn't be
 584     // possible if we're read-only
 585     if ( !IsEditable() )
 586     {
 587         event.Skip();
 588         return;
 589     }
 590
 591     if (event.GetKeyCode() == WXK_RETURN)
 592     {
 593         BeginBatchUndo(_("Insert Text"));
 594
 595         long newPos = m_caretPosition;
 596
 597         DeleteSelectedContent(& newPos);
 598
 599         if (event.ShiftDown())
 600         {
 601             wxString text;
 602             text = wxRichTextLineBreakChar;
 603             GetBuffer().InsertTextWithUndo(newPos+1, text, this);
 604         }
 605         else
 606             GetBuffer().InsertNewlineWithUndo(newPos+1, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE|wxRICHTEXT_INSERT_INTERACTIVE);
 607
 608         EndBatchUndo();
 609         SetDefaultStyleToCursorStyle();
 610
 611         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 612
 613         wxRichTextEvent cmdEvent(
 614             wxEVT_COMMAND_RICHTEXT_RETURN,
 615             GetId());
 616         cmdEvent.SetEventObject(this);
 617         cmdEvent.SetFlags(flags);
 618         cmdEvent.SetPosition(newPos+1);
 619
 620         if (!GetEventHandler()->ProcessEvent(cmdEvent))
 621         {
 622             // Generate conventional event
 623             wxCommandEvent textEvent(wxEVT_COMMAND_TEXT_ENTER, GetId());
 624             InitCommandEvent(textEvent);
 625
 626             GetEventHandler()->ProcessEvent(textEvent);
 627         }
 628         Update();
 629     }
 630     else if (event.GetKeyCode() == WXK_BACK)
 631     {
 632         BeginBatchUndo(_("Delete Text"));
 633
 634         // Submit range in character positions, which are greater than caret positions,
 635         // so subtract 1 for deleted character and add 1 for conversion to character position.
 636         if (m_caretPosition > -1 && !HasSelection())
 637         {
 638             bool processed = false;
 639             if (event.CmdDown())
 640             {
 641                 long pos = wxRichTextCtrl::FindNextWordPosition(-1);
 642                 if (pos != -1 && (pos < m_caretPosition))
 643                 {
 644                     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(pos+1, m_caretPosition), this);
 645                     processed = true;
 646                 }
 647             }
 648
 649             if (!processed)
 650                 GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition, m_caretPosition), this);
 651         }
 652         else
 653             DeleteSelectedContent();
 654
 655         EndBatchUndo();
 656
 657         if (GetLastPosition() == -1)
 658         {
 659             GetBuffer().Reset();
 660
 661             m_caretPosition = -1;
 662             PositionCaret();
 663             SetDefaultStyleToCursorStyle();
 664         }
 665
 666         ScrollIntoView(m_caretPosition, WXK_LEFT);
 667
 668         wxRichTextEvent cmdEvent(
 669             wxEVT_COMMAND_RICHTEXT_DELETE,
 670             GetId());
 671         cmdEvent.SetEventObject(this);
 672         cmdEvent.SetFlags(flags);
 673         cmdEvent.SetPosition(m_caretPosition+1);
 674         GetEventHandler()->ProcessEvent(cmdEvent);
 675
 676         Update();
 677     }
 678     else if (event.GetKeyCode() == WXK_DELETE)
 679     {
 680         BeginBatchUndo(_("Delete Text"));
 681
 682         // Submit range in character positions, which are greater than caret positions,
 683         if (m_caretPosition < GetBuffer().GetRange().GetEnd()+1 && !HasSelection())
 684         {
 685             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition+1, m_caretPosition+1), this);
 686         }
 687         else
 688             DeleteSelectedContent();
 689
 690         EndBatchUndo();
 691
 692         if (GetLastPosition() == -1)
 693         {
 694             GetBuffer().Reset();
 695
 696             m_caretPosition = -1;
 697             PositionCaret();
 698             SetDefaultStyleToCursorStyle();
 699         }
 700
 701         wxRichTextEvent cmdEvent(
 702             wxEVT_COMMAND_RICHTEXT_DELETE,
 703             GetId());
 704         cmdEvent.SetEventObject(this);
 705         cmdEvent.SetFlags(flags);
 706         cmdEvent.SetPosition(m_caretPosition+1);
 707         GetEventHandler()->ProcessEvent(cmdEvent);
 708
 709         Update();
 710     }
 711     else
 712     {
 713         long keycode = event.GetKeyCode();
 714         switch ( keycode )
 715         {
 716             case WXK_ESCAPE:
 717             case WXK_DELETE:
 718             case WXK_START:
 719             case WXK_LBUTTON:
 720             case WXK_RBUTTON:
 721             case WXK_CANCEL:
 722             case WXK_MBUTTON:
 723             case WXK_CLEAR:
 724             case WXK_SHIFT:
 725             case WXK_ALT:
 726             case WXK_CONTROL:
 727             case WXK_MENU:
 728             case WXK_PAUSE:
 729             case WXK_CAPITAL:
 730             case WXK_END:
 731             case WXK_HOME:
 732             case WXK_LEFT:
 733             case WXK_UP:
 734             case WXK_RIGHT:
 735             case WXK_DOWN:
 736             case WXK_SELECT:
 737             case WXK_PRINT:
 738             case WXK_EXECUTE:
 739             case WXK_SNAPSHOT:
 740             case WXK_INSERT:
 741             case WXK_HELP:
 742             case WXK_NUMPAD0:
 743             case WXK_NUMPAD1:
 744             case WXK_NUMPAD2:
 745             case WXK_NUMPAD3:
 746             case WXK_NUMPAD4:
 747             case WXK_NUMPAD5:
 748             case WXK_NUMPAD6:
 749             case WXK_NUMPAD7:
 750             case WXK_NUMPAD8:
 751             case WXK_NUMPAD9:
 752             case WXK_MULTIPLY:
 753             case WXK_ADD:
 754             case WXK_SEPARATOR:
 755             case WXK_SUBTRACT:
 756             case WXK_DECIMAL:
 757             case WXK_DIVIDE:
 758             case WXK_F1:
 759             case WXK_F2:
 760             case WXK_F3:
 761             case WXK_F4:
 762             case WXK_F5:
 763             case WXK_F6:
 764             case WXK_F7:
 765             case WXK_F8:
 766             case WXK_F9:
 767             case WXK_F10:
 768             case WXK_F11:
 769             case WXK_F12:
 770             case WXK_F13:
 771             case WXK_F14:
 772             case WXK_F15:
 773             case WXK_F16:
 774             case WXK_F17:
 775             case WXK_F18:
 776             case WXK_F19:
 777             case WXK_F20:
 778             case WXK_F21:
 779             case WXK_F22:
 780             case WXK_F23:
 781             case WXK_F24:
 782             case WXK_NUMLOCK:
 783             case WXK_SCROLL:
 784             case WXK_PAGEUP:
 785             case WXK_PAGEDOWN:
 786             case WXK_NUMPAD_SPACE:
 787             case WXK_NUMPAD_TAB:
 788             case WXK_NUMPAD_ENTER:
 789             case WXK_NUMPAD_F1:
 790             case WXK_NUMPAD_F2:
 791             case WXK_NUMPAD_F3:
 792             case WXK_NUMPAD_F4:
 793             case WXK_NUMPAD_HOME:
 794             case WXK_NUMPAD_LEFT:
 795             case WXK_NUMPAD_UP:
 796             case WXK_NUMPAD_RIGHT:
 797             case WXK_NUMPAD_DOWN:
 798             case WXK_NUMPAD_PAGEUP:
 799             case WXK_NUMPAD_PAGEDOWN:
 800             case WXK_NUMPAD_END:
 801             case WXK_NUMPAD_BEGIN:
 802             case WXK_NUMPAD_INSERT:
 803             case WXK_NUMPAD_DELETE:
 804             case WXK_NUMPAD_EQUAL:
 805             case WXK_NUMPAD_MULTIPLY:
 806             case WXK_NUMPAD_ADD:
 807             case WXK_NUMPAD_SEPARATOR:
 808             case WXK_NUMPAD_SUBTRACT:
 809             case WXK_NUMPAD_DECIMAL:
 810             case WXK_WINDOWS_LEFT:
 811             {
 812                 event.Skip();
 813                 return;
 814             }
 815
 816             default:
 817             {
 818                 if (event.CmdDown() || event.AltDown())
 819                 {
 820                     event.Skip();
 821                     return;
 822                 }
 823
 824                 wxRichTextEvent cmdEvent(
 825                     wxEVT_COMMAND_RICHTEXT_CHARACTER,
 826                     GetId());
 827                 cmdEvent.SetEventObject(this);
 828                 cmdEvent.SetFlags(flags);
 829 #if wxUSE_UNICODE
 830                 cmdEvent.SetCharacter(event.GetUnicodeKey());
 831 #else
 832                 cmdEvent.SetCharacter((wxChar) keycode);
 833 #endif
 834                 cmdEvent.SetPosition(m_caretPosition+1);
 835
 836                 if (keycode == wxT('\t'))
 837                 {
 838                     // See if we need to promote or demote the selection or paragraph at the cursor
 839                     // position, instead of inserting a tab.
 840                     long pos = GetAdjustedCaretPosition(GetCaretPosition());
 841                     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos);
 842                     if (para && para->GetRange().GetStart() == pos && para->GetAttributes().HasListStyleName())
 843                     {
 844                         wxRichTextRange range;
 845                         if (HasSelection())
 846                             range = GetSelectionRange();
 847                         else
 848                             range = para->GetRange().FromInternal();
 849
 850                         int promoteBy = event.ShiftDown() ? 1 : -1;
 851
 852                         PromoteList(promoteBy, range, NULL);
 853
 854                         GetEventHandler()->ProcessEvent(cmdEvent);
 855
 856                         return;
 857                     }
 858                 }
 859
 860                 BeginBatchUndo(_("Insert Text"));
 861
 862                 long newPos = m_caretPosition;
 863                 DeleteSelectedContent(& newPos);
 864
 865 #if wxUSE_UNICODE
 866                 wxString str = event.GetUnicodeKey();
 867 #else
 868                 wxString str = (wxChar) event.GetKeyCode();
 869 #endif
 870                 GetBuffer().InsertTextWithUndo(newPos+1, str, this, 0);
 871
 872                 EndBatchUndo();
 873
 874                 SetDefaultStyleToCursorStyle();
 875                 ScrollIntoView(m_caretPosition, WXK_RIGHT);
 876
 877                 GetEventHandler()->ProcessEvent(cmdEvent);
 878
 879                 Update();
 880             }
 881         }
 882     }
 883 }
 884
 885 /// Delete content if there is a selection, e.g. when pressing a key.
 886 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
 887 {
 888     if (HasSelection())
 889     {
 890         long pos = m_selectionRange.GetStart();
 891         GetBuffer().DeleteRangeWithUndo(m_selectionRange, this);
 892         m_selectionRange.SetRange(-2, -2);
 893
 894         if (newPos)
 895             *newPos = pos-1;
 896         return true;
 897     }
 898     else
 899         return false;
 900 }
 901
 902 /// Keyboard navigation
 903
 904 /*
 905
 906 Left:       left one character
 907 Right:      right one character
 908 Up:         up one line
 909 Down:       down one line
 910 Ctrl-Left:  left one word
 911 Ctrl-Right: right one word
 912 Ctrl-Up:    previous paragraph start
 913 Ctrl-Down:  next start of paragraph
 914 Home:       start of line
 915 End:        end of line
 916 Ctrl-Home:  start of document
 917 Ctrl-End:   end of document
 918 Page-Up:    Up a screen
 919 Page-Down:  Down a screen
 920
 921 Maybe:
 922
 923 Ctrl-Alt-PgUp: Start of window
 924 Ctrl-Alt-PgDn: End of window
 925 F8:         Start selection mode
 926 Esc:        End selection mode
 927
 928 Adding Shift does the above but starts/extends selection.
 929
 930
 931  */
 932
 933 bool wxRichTextCtrl::KeyboardNavigate(int keyCode, int flags)
 934 {
 935     bool success = false;
 936
 937     if (keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT)
 938     {
 939         if (flags & wxRICHTEXT_CTRL_DOWN)
 940             success = WordRight(1, flags);
 941         else
 942             success = MoveRight(1, flags);
 943     }
 944     else if (keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT)
 945     {
 946         if (flags & wxRICHTEXT_CTRL_DOWN)
 947             success = WordLeft(1, flags);
 948         else
 949             success = MoveLeft(1, flags);
 950     }
 951     else if (keyCode == WXK_UP || keyCode == WXK_NUMPAD_UP)
 952     {
 953         if (flags & wxRICHTEXT_CTRL_DOWN)
 954             success = MoveToParagraphStart(flags);
 955         else
 956             success = MoveUp(1, flags);
 957     }
 958     else if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN)
 959     {
 960         if (flags & wxRICHTEXT_CTRL_DOWN)
 961             success = MoveToParagraphEnd(flags);
 962         else
 963             success = MoveDown(1, flags);
 964     }
 965     else if (keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP)
 966     {
 967         success = PageUp(1, flags);
 968     }
 969     else if (keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
 970     {
 971         success = PageDown(1, flags);
 972     }
 973     else if (keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME)
 974     {
 975         if (flags & wxRICHTEXT_CTRL_DOWN)
 976             success = MoveHome(flags);
 977         else
 978             success = MoveToLineStart(flags);
 979     }
 980     else if (keyCode == WXK_END || keyCode == WXK_NUMPAD_END)
 981     {
 982         if (flags & wxRICHTEXT_CTRL_DOWN)
 983             success = MoveEnd(flags);
 984         else
 985             success = MoveToLineEnd(flags);
 986     }
 987
 988     if (success)
 989     {
 990         ScrollIntoView(m_caretPosition, keyCode);
 991         SetDefaultStyleToCursorStyle();
 992     }
 993
 994     return success;
 995 }
 996
 997 /// Extend the selection. Selections are in caret positions.
 998 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
 999 {
1000     if (flags & wxRICHTEXT_SHIFT_DOWN)
1001     {
1002         wxRichTextRange oldSelection = m_selectionRange;
1003
1004         // If not currently selecting, start selecting
1005         if (m_selectionRange.GetStart() == -2)
1006         {
1007             m_selectionAnchor = oldPos;
1008
1009             if (oldPos > newPos)
1010                 m_selectionRange.SetRange(newPos+1, oldPos);
1011             else
1012                 m_selectionRange.SetRange(oldPos+1, newPos);
1013         }
1014         else
1015         {
1016             // Always ensure that the selection range start is greater than
1017             // the end.
1018             if (newPos > m_selectionAnchor)
1019                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
1020             else
1021                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
1022         }
1023
1024         RefreshForSelectionChange(oldSelection, m_selectionRange);
1025
1026         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
1027         {
1028             wxLogDebug(wxT("Strange selection range"));
1029         }
1030
1031         return true;
1032     }
1033     else
1034         return false;
1035 }
1036
1037 /// Scroll into view, returning true if we scrolled.
1038 /// This takes a _caret_ position.
1039 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
1040 {
1041     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
1042
1043     if (!line)
1044         return false;
1045
1046     int ppuX, ppuY;
1047     GetScrollPixelsPerUnit(& ppuX, & ppuY);
1048
1049     int startXUnits, startYUnits;
1050     GetViewStart(& startXUnits, & startYUnits);
1051     int startY = startYUnits * ppuY;
1052
1053     int sx = 0, sy = 0;
1054     GetVirtualSize(& sx, & sy);
1055     int sxUnits = 0;
1056     int syUnits = 0;
1057     if (ppuY != 0)
1058         syUnits = sy/ppuY;
1059
1060     wxRect rect = line->GetRect();
1061
1062     bool scrolled = false;
1063
1064     wxSize clientSize = GetClientSize();
1065
1066     // Going down
1067     if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN ||
1068         keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT ||
1069         keyCode == WXK_END || keyCode == WXK_NUMPAD_END ||
1070         keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
1071     {
1072         if ((rect.y + rect.height) > (clientSize.y + startY))
1073         {
1074             // Make it scroll so this item is at the bottom
1075             // of the window
1076             int y = rect.y - (clientSize.y - rect.height);
1077             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1078
1079             // If we're still off the screen, scroll another line down
1080             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1081                 yUnits ++;
1082
1083             if (startYUnits != yUnits)
1084             {
1085                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1086                 scrolled = true;
1087             }
1088         }
1089         else if (rect.y < startY)
1090         {
1091             // Make it scroll so this item is at the top
1092             // of the window
1093             int y = rect.y ;
1094             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1095
1096             if (startYUnits != yUnits)
1097             {
1098                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1099                 scrolled = true;
1100             }
1101         }
1102     }
1103     // Going up
1104     else if (keyCode == WXK_UP  || keyCode == WXK_NUMPAD_UP ||
1105              keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT ||
1106              keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME ||
1107              keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP )
1108     {
1109         if (rect.y < startY)
1110         {
1111             // Make it scroll so this item is at the top
1112             // of the window
1113             int y = rect.y ;
1114             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1115
1116             if (startYUnits != yUnits)
1117             {
1118                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1119                 scrolled = true;
1120             }
1121         }
1122         else if ((rect.y + rect.height) > (clientSize.y + startY))
1123         {
1124             // Make it scroll so this item is at the bottom
1125             // of the window
1126             int y = rect.y - (clientSize.y - rect.height);
1127             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1128
1129             // If we're still off the screen, scroll another line down
1130             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1131                 yUnits ++;
1132
1133             if (startYUnits != yUnits)
1134             {
1135                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1136                 scrolled = true;
1137             }
1138         }
1139     }
1140
1141     if (scrolled)
1142         PositionCaret();
1143
1144     return scrolled;
1145 }
1146
1147 /// Is the given position visible on the screen?
1148 bool wxRichTextCtrl::IsPositionVisible(long pos) const
1149 {
1150     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
1151
1152     if (!line)
1153         return false;
1154
1155     int ppuX, ppuY;
1156     GetScrollPixelsPerUnit(& ppuX, & ppuY);
1157
1158     int startX, startY;
1159     GetViewStart(& startX, & startY);
1160     startX = 0;
1161     startY = startY * ppuY;
1162
1163     wxRect rect = line->GetRect();
1164     wxSize clientSize = GetClientSize();
1165
1166     return (rect.GetBottom() > startY) && (rect.GetTop() < (startY + clientSize.y));
1167 }
1168
1169 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
1170 {
1171     m_caretPosition = position;
1172     m_caretAtLineStart = showAtLineStart;
1173 }
1174
1175 /// Move caret one visual step forward: this may mean setting a flag
1176 /// and keeping the same position if we're going from the end of one line
1177 /// to the start of the next, which may be the exact same caret position.
1178 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
1179 {
1180     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1181
1182     // Only do the check if we're not at the end of the paragraph (where things work OK
1183     // anyway)
1184     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
1185     {
1186         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1187
1188         if (line)
1189         {
1190             wxRichTextRange lineRange = line->GetAbsoluteRange();
1191
1192             // We're at the end of a line. See whether we need to
1193             // stay at the same actual caret position but change visual
1194             // position, or not.
1195             if (oldPosition == lineRange.GetEnd())
1196             {
1197                 if (m_caretAtLineStart)
1198                 {
1199                     // We're already at the start of the line, so actually move on now.
1200                     m_caretPosition = oldPosition + 1;
1201                     m_caretAtLineStart = false;
1202                 }
1203                 else
1204                 {
1205                     // We're showing at the end of the line, so keep to
1206                     // the same position but indicate that we're to show
1207                     // at the start of the next line.
1208                     m_caretPosition = oldPosition;
1209                     m_caretAtLineStart = true;
1210                 }
1211                 SetDefaultStyleToCursorStyle();
1212                 return;
1213             }
1214         }
1215     }
1216     m_caretPosition ++;
1217     SetDefaultStyleToCursorStyle();
1218 }
1219
1220 /// Move caret one visual step backward: this may mean setting a flag
1221 /// and keeping the same position if we're going from the end of one line
1222 /// to the start of the next, which may be the exact same caret position.
1223 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
1224 {
1225     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1226
1227     // Only do the check if we're not at the start of the paragraph (where things work OK
1228     // anyway)
1229     if (para && (oldPosition != para->GetRange().GetStart()))
1230     {
1231         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1232
1233         if (line)
1234         {
1235             wxRichTextRange lineRange = line->GetAbsoluteRange();
1236
1237             // We're at the start of a line. See whether we need to
1238             // stay at the same actual caret position but change visual
1239             // position, or not.
1240             if (oldPosition == lineRange.GetStart())
1241             {
1242                 m_caretPosition = oldPosition-1;
1243                 m_caretAtLineStart = true;
1244                 return;
1245             }
1246             else if (oldPosition == lineRange.GetEnd())
1247             {
1248                 if (m_caretAtLineStart)
1249                 {
1250                     // We're at the start of the line, so keep the same caret position
1251                     // but clear the start-of-line flag.
1252                     m_caretPosition = oldPosition;
1253                     m_caretAtLineStart = false;
1254                 }
1255                 else
1256                 {
1257                     // We're showing at the end of the line, so go back
1258                     // to the previous character position.
1259                     m_caretPosition = oldPosition - 1;
1260                 }
1261                 SetDefaultStyleToCursorStyle();
1262                 return;
1263             }
1264         }
1265     }
1266     m_caretPosition --;
1267     SetDefaultStyleToCursorStyle();
1268 }
1269
1270 /// Move right
1271 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
1272 {
1273     long endPos = GetBuffer().GetRange().GetEnd();
1274
1275     if (m_caretPosition + noPositions < endPos)
1276     {
1277         long oldPos = m_caretPosition;
1278         long newPos = m_caretPosition + noPositions;
1279
1280         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1281         if (!extendSel)
1282             SelectNone();
1283
1284         // Determine by looking at oldPos and m_caretPosition whether
1285         // we moved from the end of a line to the start of the next line, in which case
1286         // we want to adjust the caret position such that it is positioned at the
1287         // start of the next line, rather than jumping past the first character of the
1288         // line.
1289         if (noPositions == 1 && !extendSel)
1290             MoveCaretForward(oldPos);
1291         else
1292             SetCaretPosition(newPos);
1293
1294         PositionCaret();
1295         SetDefaultStyleToCursorStyle();
1296
1297         return true;
1298     }
1299     else
1300         return false;
1301 }
1302
1303 /// Move left
1304 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
1305 {
1306     long startPos = -1;
1307
1308     if (m_caretPosition > startPos - noPositions + 1)
1309     {
1310         long oldPos = m_caretPosition;
1311         long newPos = m_caretPosition - noPositions;
1312         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1313         if (!extendSel)
1314             SelectNone();
1315
1316         if (noPositions == 1 && !extendSel)
1317             MoveCaretBack(oldPos);
1318         else
1319             SetCaretPosition(newPos);
1320
1321         PositionCaret();
1322         SetDefaultStyleToCursorStyle();
1323
1324         return true;
1325     }
1326     else
1327         return false;
1328 }
1329
1330 /// Move up
1331 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
1332 {
1333     return MoveDown(- noLines, flags);
1334 }
1335
1336 /// Move up
1337 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
1338 {
1339     if (!GetCaret())
1340         return false;
1341
1342     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
1343     wxPoint pt = GetCaret()->GetPosition();
1344     long newLine = lineNumber + noLines;
1345
1346     if (lineNumber != -1)
1347     {
1348         if (noLines > 0)
1349         {
1350             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
1351
1352             if (newLine > lastLine)
1353                 return false;
1354         }
1355         else
1356         {
1357             if (newLine < 0)
1358                 return false;
1359         }
1360     }
1361
1362     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1363     if (lineObj)
1364     {
1365         pt.y = lineObj->GetAbsolutePosition().y + 2;
1366     }
1367     else
1368         return false;
1369
1370     long newPos = 0;
1371     wxClientDC dc(this);
1372     PrepareDC(dc);
1373     dc.SetFont(GetFont());
1374
1375     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1376
1377     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1378     {
1379         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1380         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1381         // so we view the caret at the start of the line.
1382         bool caretLineStart = false;
1383         if (hitTest & wxRICHTEXT_HITTEST_BEFORE)
1384         {
1385             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1386             wxRichTextRange lineRange;
1387             if (thisLine)
1388                 lineRange = thisLine->GetAbsoluteRange();
1389
1390             if (thisLine && (newPos-1) == lineRange.GetEnd())
1391             {
1392                 newPos --;
1393                 caretLineStart = true;
1394             }
1395             else
1396             {
1397                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1398                 if (para && para->GetRange().GetStart() == newPos)
1399                     newPos --;
1400             }
1401         }
1402
1403         long newSelEnd = newPos;
1404
1405         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1406         if (!extendSel)
1407             SelectNone();
1408
1409         SetCaretPosition(newPos, caretLineStart);
1410         PositionCaret();
1411         SetDefaultStyleToCursorStyle();
1412
1413         return true;
1414     }
1415
1416     return false;
1417 }
1418
1419 /// Move to the end of the paragraph
1420 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1421 {
1422     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1423     if (para)
1424     {
1425         long newPos = para->GetRange().GetEnd() - 1;
1426         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1427         if (!extendSel)
1428             SelectNone();
1429
1430         SetCaretPosition(newPos);
1431         PositionCaret();
1432         SetDefaultStyleToCursorStyle();
1433
1434         return true;
1435     }
1436
1437     return false;
1438 }
1439
1440 /// Move to the start of the paragraph
1441 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1442 {
1443     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1444     if (para)
1445     {
1446         long newPos = para->GetRange().GetStart() - 1;
1447         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1448         if (!extendSel)
1449             SelectNone();
1450
1451         SetCaretPosition(newPos);
1452         PositionCaret();
1453         SetDefaultStyleToCursorStyle();
1454
1455         return true;
1456     }
1457
1458     return false;
1459 }
1460
1461 /// Move to the end of the line
1462 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1463 {
1464     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1465
1466     if (line)
1467     {
1468         wxRichTextRange lineRange = line->GetAbsoluteRange();
1469         long newPos = lineRange.GetEnd();
1470         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1471         if (!extendSel)
1472             SelectNone();
1473
1474         SetCaretPosition(newPos);
1475         PositionCaret();
1476         SetDefaultStyleToCursorStyle();
1477
1478         return true;
1479     }
1480
1481     return false;
1482 }
1483
1484 /// Move to the start of the line
1485 bool wxRichTextCtrl::MoveToLineStart(int flags)
1486 {
1487     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1488     if (line)
1489     {
1490         wxRichTextRange lineRange = line->GetAbsoluteRange();
1491         long newPos = lineRange.GetStart()-1;
1492
1493         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1494         if (!extendSel)
1495             SelectNone();
1496
1497         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1498
1499         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1500         PositionCaret();
1501         SetDefaultStyleToCursorStyle();
1502
1503         return true;
1504     }
1505
1506     return false;
1507 }
1508
1509 /// Move to the start of the buffer
1510 bool wxRichTextCtrl::MoveHome(int flags)
1511 {
1512     if (m_caretPosition != -1)
1513     {
1514         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1515         if (!extendSel)
1516             SelectNone();
1517
1518         SetCaretPosition(-1);
1519         PositionCaret();
1520         SetDefaultStyleToCursorStyle();
1521
1522         return true;
1523     }
1524     else
1525         return false;
1526 }
1527
1528 /// Move to the end of the buffer
1529 bool wxRichTextCtrl::MoveEnd(int flags)
1530 {
1531     long endPos = GetBuffer().GetRange().GetEnd()-1;
1532
1533     if (m_caretPosition != endPos)
1534     {
1535         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1536         if (!extendSel)
1537             SelectNone();
1538
1539         SetCaretPosition(endPos);
1540         PositionCaret();
1541         SetDefaultStyleToCursorStyle();
1542
1543         return true;
1544     }
1545     else
1546         return false;
1547 }
1548
1549 /// Move noPages pages up
1550 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1551 {
1552     return PageDown(- noPages, flags);
1553 }
1554
1555 /// Move noPages pages down
1556 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1557 {
1558     // Calculate which line occurs noPages * screen height further down.
1559     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1560     if (line)
1561     {
1562         wxSize clientSize = GetClientSize();
1563         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1564
1565         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1566         if (newLine)
1567         {
1568             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1569             long pos = lineRange.GetStart()-1;
1570             if (pos != m_caretPosition)
1571             {
1572                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1573
1574                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1575                 if (!extendSel)
1576                     SelectNone();
1577
1578                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1579                 PositionCaret();
1580                 SetDefaultStyleToCursorStyle();
1581
1582                 return true;
1583             }
1584         }
1585     }
1586
1587     return false;
1588 }
1589
1590 static bool wxRichTextCtrlIsWhitespace(const wxString& str)
1591 {
1592     return str == wxT(" ") || str == wxT("\t");
1593 }
1594
1595 // Finds the caret position for the next word
1596 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1597 {
1598     long endPos = GetBuffer().GetRange().GetEnd();
1599
1600     if (direction > 0)
1601     {
1602         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1603
1604         // First skip current text to space
1605         while (i < endPos && i > -1)
1606         {
1607             // i is in character, not caret positions
1608             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1609             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1610             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1611             {
1612                 break;
1613             }
1614             else if (!wxRichTextCtrlIsWhitespace(text) && !text.empty())
1615                 i += direction;
1616             else
1617             {
1618                 break;
1619             }
1620         }
1621         while (i < endPos && i > -1)
1622         {
1623             // i is in character, not caret positions
1624             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1625             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1626             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1627                 return wxMax(-1, i);
1628
1629             if (text.empty()) // End of paragraph, or maybe an image
1630                 return wxMax(-1, i - 1);
1631             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1632                 i += direction;
1633             else
1634             {
1635                 // Convert to caret position
1636                 return wxMax(-1, i - 1);
1637             }
1638         }
1639         if (i >= endPos)
1640             return endPos-1;
1641         return i-1;
1642     }
1643     else
1644     {
1645         long i = m_caretPosition;
1646
1647         // First skip white space
1648         while (i < endPos && i > -1)
1649         {
1650             // i is in character, not caret positions
1651             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1652             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1653
1654             if (text.empty() || (line && (i == line->GetAbsoluteRange().GetStart()))) // End of paragraph, or maybe an image
1655                 break;
1656             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1657                 i += direction;
1658             else
1659                 break;
1660         }
1661         // Next skip current text to space
1662         while (i < endPos && i > -1)
1663         {
1664             // i is in character, not caret positions
1665             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1666             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1667             if (line && line->GetAbsoluteRange().GetStart() == i)
1668                 return i-1;
1669
1670             if (!wxRichTextCtrlIsWhitespace(text) /* && !text.empty() */)
1671                 i += direction;
1672             else
1673             {
1674                 return i;
1675             }
1676         }
1677         if (i < -1)
1678             return -1;
1679         return i;
1680     }
1681 }
1682
1683 /// Move n words left
1684 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1685 {
1686     long pos = FindNextWordPosition(-1);
1687     if (pos != m_caretPosition)
1688     {
1689         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1690
1691         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1692         if (!extendSel)
1693             SelectNone();
1694
1695         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1696         PositionCaret();
1697         SetDefaultStyleToCursorStyle();
1698
1699         return true;
1700     }
1701
1702     return false;
1703 }
1704
1705 /// Move n words right
1706 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1707 {
1708     long pos = FindNextWordPosition(1);
1709     if (pos != m_caretPosition)
1710     {
1711         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1712
1713         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1714         if (!extendSel)
1715             SelectNone();
1716
1717         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1718         PositionCaret();
1719         SetDefaultStyleToCursorStyle();
1720
1721         return true;
1722     }
1723
1724     return false;
1725 }
1726
1727 /// Sizing
1728 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1729 {
1730     // Only do sizing optimization for large buffers
1731     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1732     {
1733         m_fullLayoutRequired = true;
1734         m_fullLayoutTime = wxGetLocalTimeMillis();
1735         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1736         LayoutContent(true /* onlyVisibleRect */);
1737     }
1738     else
1739         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1740
1741 #if wxRICHTEXT_BUFFERED_PAINTING
1742     RecreateBuffer();
1743 #endif
1744
1745     event.Skip();
1746 }
1747
1748
1749 /// Idle-time processing
1750 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1751 {
1752     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1753
1754     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1755     {
1756         m_fullLayoutRequired = false;
1757         m_fullLayoutTime = 0;
1758         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1759         ShowPosition(m_fullLayoutSavedPosition);
1760         Refresh(false);
1761     }
1762
1763     if (m_caretPositionForDefaultStyle != -2)
1764     {
1765         // If the caret position has changed, no longer reflect the default style
1766         // in the UI.
1767         if (GetCaretPosition() != m_caretPositionForDefaultStyle)
1768             m_caretPositionForDefaultStyle = -2;
1769     }
1770
1771     event.Skip();
1772 }
1773
1774 /// Scrolling
1775 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1776 {
1777     // Not used
1778     event.Skip();
1779 }
1780
1781 /// Set up scrollbars, e.g. after a resize
1782 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1783 {
1784     if (IsFrozen())
1785         return;
1786
1787     if (GetBuffer().IsEmpty())
1788     {
1789         SetScrollbars(0, 0, 0, 0, 0, 0);
1790         return;
1791     }
1792
1793     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1794     // of pixels. See e.g. wxVScrolledWindow for ideas.
1795     int pixelsPerUnit = 5;
1796     wxSize clientSize = GetClientSize();
1797
1798     int maxHeight = GetBuffer().GetCachedSize().y;
1799
1800     // Round up so we have at least maxHeight pixels
1801     int unitsY = (int) (((float)maxHeight/(float)pixelsPerUnit) + 0.5);
1802
1803     int startX = 0, startY = 0;
1804     if (!atTop)
1805         GetViewStart(& startX, & startY);
1806
1807     int maxPositionX = 0;
1808     int maxPositionY = (int) ((((float)(wxMax((unitsY*pixelsPerUnit) - clientSize.y, 0)))/((float)pixelsPerUnit)) + 0.5);
1809
1810     int newStartX = wxMin(maxPositionX, startX);
1811     int newStartY = wxMin(maxPositionY, startY);
1812
1813     int oldPPUX, oldPPUY;
1814     int oldStartX, oldStartY;
1815     int oldVirtualSizeX = 0, oldVirtualSizeY = 0;
1816     GetScrollPixelsPerUnit(& oldPPUX, & oldPPUY);
1817     GetViewStart(& oldStartX, & oldStartY);
1818     GetVirtualSize(& oldVirtualSizeX, & oldVirtualSizeY);
1819     if (oldPPUY > 0)
1820         oldVirtualSizeY /= oldPPUY;
1821
1822     if (oldPPUX == 0 && oldPPUY == pixelsPerUnit && oldVirtualSizeY == unitsY && oldStartX == newStartX && oldStartY == newStartY)
1823         return;
1824
1825     // Don't set scrollbars if there were none before, and there will be none now.
1826     if (oldPPUY != 0 && (oldVirtualSizeY < clientSize.y) && (unitsY*pixelsPerUnit < clientSize.y))
1827         return;
1828
1829     // Move to previous scroll position if
1830     // possible
1831     SetScrollbars(0, pixelsPerUnit, 0, unitsY, newStartX, newStartY);
1832 }
1833
1834 /// Paint the background
1835 void wxRichTextCtrl::PaintBackground(wxDC& dc)
1836 {
1837     wxColour backgroundColour = GetBackgroundColour();
1838     if (!backgroundColour.Ok())
1839         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
1840
1841     // Clear the background
1842     dc.SetBrush(wxBrush(backgroundColour));
1843     dc.SetPen(*wxTRANSPARENT_PEN);
1844     wxRect windowRect(GetClientSize());
1845     windowRect.x -= 2; windowRect.y -= 2;
1846     windowRect.width += 4; windowRect.height += 4;
1847
1848     // We need to shift the rectangle to take into account
1849     // scrolling. Converting device to logical coordinates.
1850     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
1851     dc.DrawRectangle(windowRect);
1852 }
1853
1854 #if wxRICHTEXT_BUFFERED_PAINTING
1855 /// Recreate buffer bitmap if necessary
1856 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
1857 {
1858     wxSize sz = size;
1859     if (sz == wxDefaultSize)
1860         sz = GetClientSize();
1861
1862     if (sz.x < 1 || sz.y < 1)
1863         return false;
1864
1865     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
1866         m_bufferBitmap = wxBitmap(sz.x, sz.y);
1867     return m_bufferBitmap.Ok();
1868 }
1869 #endif
1870
1871 // ----------------------------------------------------------------------------
1872 // file IO functions
1873 // ----------------------------------------------------------------------------
1874
1875 bool wxRichTextCtrl::DoLoadFile(const wxString& filename, int fileType)
1876 {
1877     bool success = GetBuffer().LoadFile(filename, fileType);
1878     if (success)
1879         m_filename = filename;
1880
1881     DiscardEdits();
1882     SetInsertionPoint(0);
1883     LayoutContent();
1884     PositionCaret();
1885     SetupScrollbars(true);
1886     Refresh(false);
1887     wxTextCtrl::SendTextUpdatedEvent(this);
1888
1889     if (success)
1890         return true;
1891     else
1892     {
1893         wxLogError(_("File couldn't be loaded."));
1894
1895         return false;
1896     }
1897 }
1898
1899 bool wxRichTextCtrl::DoSaveFile(const wxString& filename, int fileType)
1900 {
1901     if (GetBuffer().SaveFile(filename, fileType))
1902     {
1903         m_filename = filename;
1904
1905         DiscardEdits();
1906
1907         return true;
1908     }
1909
1910     wxLogError(_("The text couldn't be saved."));
1911
1912     return false;
1913 }
1914
1915 // ----------------------------------------------------------------------------
1916 // wxRichTextCtrl specific functionality
1917 // ----------------------------------------------------------------------------
1918
1919 /// Add a new paragraph of text to the end of the buffer
1920 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
1921 {
1922     wxRichTextRange range = GetBuffer().AddParagraph(text);
1923     LayoutContent();
1924     return range;
1925 }
1926
1927 /// Add an image
1928 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
1929 {
1930     wxRichTextRange range = GetBuffer().AddImage(image);
1931     LayoutContent();
1932     return range;
1933 }
1934
1935 // ----------------------------------------------------------------------------
1936 // selection and ranges
1937 // ----------------------------------------------------------------------------
1938
1939 void wxRichTextCtrl::SelectAll()
1940 {
1941     SetSelection(0, GetLastPosition()+1);
1942     m_selectionAnchor = -1;
1943 }
1944
1945 /// Select none
1946 void wxRichTextCtrl::SelectNone()
1947 {
1948     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
1949     {
1950         wxRichTextRange oldSelection = m_selectionRange;
1951
1952         m_selectionRange = wxRichTextRange(-2, -2);
1953
1954         RefreshForSelectionChange(oldSelection, m_selectionRange);
1955     }
1956     m_selectionAnchor = -2;
1957 }
1958
1959 static bool wxIsWordDelimiter(const wxString& text)
1960 {
1961     return !text.IsEmpty() && !wxIsalnum(text[0]);
1962 }
1963
1964 /// Select the word at the given character position
1965 bool wxRichTextCtrl::SelectWord(long position)
1966 {
1967     if (position < 0 || position > GetBuffer().GetRange().GetEnd())
1968         return false;
1969
1970     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
1971     if (!para)
1972         return false;
1973
1974     if (position == para->GetRange().GetEnd())
1975         position --;
1976
1977     long positionStart = position;
1978     long positionEnd = position;
1979
1980     for (positionStart = position; positionStart >= para->GetRange().GetStart(); positionStart --)
1981     {
1982         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionStart, positionStart));
1983         if (wxIsWordDelimiter(text))
1984         {
1985             positionStart ++;
1986             break;
1987         }
1988     }
1989     if (positionStart < para->GetRange().GetStart())
1990         positionStart = para->GetRange().GetStart();
1991
1992     for (positionEnd = position; positionEnd < para->GetRange().GetEnd(); positionEnd ++)
1993     {
1994         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionEnd, positionEnd));
1995         if (wxIsWordDelimiter(text))
1996         {
1997             positionEnd --;
1998             break;
1999         }
2000     }
2001     if (positionEnd >= para->GetRange().GetEnd())
2002         positionEnd = para->GetRange().GetEnd();
2003
2004     if (positionEnd < positionStart)
2005         return false;
2006
2007     SetSelection(positionStart, positionEnd+1);
2008
2009     if (positionStart >= 0)
2010     {
2011         MoveCaret(positionStart-1, true);
2012         SetDefaultStyleToCursorStyle();
2013     }
2014
2015     return true;
2016 }
2017
2018 wxString wxRichTextCtrl::GetStringSelection() const
2019 {
2020     long from, to;
2021     GetSelection(&from, &to);
2022
2023     return GetRange(from, to);
2024 }
2025
2026 // ----------------------------------------------------------------------------
2027 // hit testing
2028 // ----------------------------------------------------------------------------
2029
2030 wxTextCtrlHitTestResult
2031 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
2032 {
2033     // implement in terms of the other overload as the native ports typically
2034     // can get the position and not (x, y) pair directly (although wxUniv
2035     // directly gets x and y -- and so overrides this method as well)
2036     long pos;
2037     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
2038
2039     if ( rc != wxTE_HT_UNKNOWN )
2040     {
2041         PositionToXY(pos, x, y);
2042     }
2043
2044     return rc;
2045 }
2046
2047 wxTextCtrlHitTestResult
2048 wxRichTextCtrl::HitTest(const wxPoint& pt,
2049                         long * pos) const
2050 {
2051     wxClientDC dc((wxRichTextCtrl*) this);
2052     ((wxRichTextCtrl*)this)->PrepareDC(dc);
2053
2054     // Buffer uses logical position (relative to start of buffer)
2055     // so convert
2056     wxPoint pt2 = GetLogicalPoint(pt);
2057
2058     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt2, *pos);
2059
2060     if ((hit & wxRICHTEXT_HITTEST_BEFORE) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2061         return wxTE_HT_BEFORE;
2062     else if ((hit & wxRICHTEXT_HITTEST_AFTER) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2063         return wxTE_HT_BEYOND;
2064     else if (hit & (wxRICHTEXT_HITTEST_BEFORE|wxRICHTEXT_HITTEST_AFTER))
2065         return wxTE_HT_ON_TEXT;
2066
2067     return wxTE_HT_UNKNOWN;
2068 }
2069
2070 // ----------------------------------------------------------------------------
2071 // set/get the controls text
2072 // ----------------------------------------------------------------------------
2073
2074 wxString wxRichTextCtrl::GetValue() const
2075 {
2076     return GetBuffer().GetText();
2077 }
2078
2079 wxString wxRichTextCtrl::GetRange(long from, long to) const
2080 {
2081     // Public API for range is different from internals
2082     return GetBuffer().GetTextForRange(wxRichTextRange(from, to-1));
2083 }
2084
2085 void wxRichTextCtrl::DoSetValue(const wxString& value, int flags)
2086 {
2087     // Don't call Clear here, since it always sends a text updated event
2088     m_buffer.ResetAndClearCommands();
2089     m_buffer.SetDirty(true);
2090     m_caretPosition = -1;
2091     m_caretPositionForDefaultStyle = -2;
2092     m_caretAtLineStart = false;
2093     m_selectionRange.SetRange(-2, -2);
2094
2095     Scroll(0,0);
2096
2097     if (!IsFrozen())
2098     {
2099         LayoutContent();
2100         Refresh(false);
2101     }
2102
2103     if (!value.IsEmpty())
2104     {
2105         // Remove empty paragraph
2106         GetBuffer().Clear();
2107         DoWriteText(value, flags);
2108
2109         // for compatibility, don't move the cursor when doing SetValue()
2110         SetInsertionPoint(0);
2111     }
2112     else
2113     {
2114         // still send an event for consistency
2115         if (flags & SetValue_SendEvent)
2116             wxTextCtrl::SendTextUpdatedEvent(this);
2117     }
2118     DiscardEdits();
2119 }
2120
2121 void wxRichTextCtrl::WriteText(const wxString& value)
2122 {
2123     DoWriteText(value);
2124 }
2125
2126 void wxRichTextCtrl::DoWriteText(const wxString& value, int flags)
2127 {
2128     wxString valueUnix = wxTextFile::Translate(value, wxTextFileType_Unix);
2129
2130     GetBuffer().InsertTextWithUndo(m_caretPosition+1, valueUnix, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
2131
2132     if ( flags & SetValue_SendEvent )
2133         wxTextCtrl::SendTextUpdatedEvent(this);
2134 }
2135
2136 void wxRichTextCtrl::AppendText(const wxString& text)
2137 {
2138     SetInsertionPointEnd();
2139
2140     WriteText(text);
2141 }
2142
2143 /// Write an image at the current insertion point
2144 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
2145 {
2146     wxRichTextImageBlock imageBlock;
2147
2148     wxImage image2 = image;
2149     if (imageBlock.MakeImageBlock(image2, bitmapType))
2150         return WriteImage(imageBlock);
2151
2152     return false;
2153 }
2154
2155 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
2156 {
2157     wxRichTextImageBlock imageBlock;
2158
2159     wxImage image;
2160     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
2161         return WriteImage(imageBlock);
2162
2163     return false;
2164 }
2165
2166 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
2167 {
2168     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
2169 }
2170
2171 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
2172 {
2173     if (bitmap.Ok())
2174     {
2175         wxRichTextImageBlock imageBlock;
2176
2177         wxImage image = bitmap.ConvertToImage();
2178         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
2179             return WriteImage(imageBlock);
2180     }
2181
2182     return false;
2183 }
2184
2185 /// Insert a newline (actually paragraph) at the current insertion point.
2186 bool wxRichTextCtrl::Newline()
2187 {
2188     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
2189 }
2190
2191 /// Insert a line break at the current insertion point.
2192 bool wxRichTextCtrl::LineBreak()
2193 {
2194     wxString text;
2195     text = wxRichTextLineBreakChar;
2196     return GetBuffer().InsertTextWithUndo(m_caretPosition+1, text, this);
2197 }
2198
2199 // ----------------------------------------------------------------------------
2200 // Clipboard operations
2201 // ----------------------------------------------------------------------------
2202
2203 void wxRichTextCtrl::Copy()
2204 {
2205     if (CanCopy())
2206     {
2207         wxRichTextRange range = GetInternalSelectionRange();
2208         GetBuffer().CopyToClipboard(range);
2209     }
2210 }
2211
2212 void wxRichTextCtrl::Cut()
2213 {
2214     if (CanCut())
2215     {
2216         wxRichTextRange range = GetInternalSelectionRange();
2217         GetBuffer().CopyToClipboard(range);
2218
2219         DeleteSelectedContent();
2220         LayoutContent();
2221         Refresh(false);
2222     }
2223 }
2224
2225 void wxRichTextCtrl::Paste()
2226 {
2227     if (CanPaste())
2228     {
2229         BeginBatchUndo(_("Paste"));
2230
2231         long newPos = m_caretPosition;
2232         DeleteSelectedContent(& newPos);
2233
2234         GetBuffer().PasteFromClipboard(newPos);
2235
2236         EndBatchUndo();
2237     }
2238 }
2239
2240 void wxRichTextCtrl::DeleteSelection()
2241 {
2242     if (CanDeleteSelection())
2243     {
2244         DeleteSelectedContent();
2245     }
2246 }
2247
2248 bool wxRichTextCtrl::HasSelection() const
2249 {
2250     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
2251 }
2252
2253 bool wxRichTextCtrl::CanCopy() const
2254 {
2255     // Can copy if there's a selection
2256     return HasSelection();
2257 }
2258
2259 bool wxRichTextCtrl::CanCut() const
2260 {
2261     return HasSelection() && IsEditable();
2262 }
2263
2264 bool wxRichTextCtrl::CanPaste() const
2265 {
2266     if ( !IsEditable() )
2267         return false;
2268
2269     return GetBuffer().CanPasteFromClipboard();
2270 }
2271
2272 bool wxRichTextCtrl::CanDeleteSelection() const
2273 {
2274     return HasSelection() && IsEditable();
2275 }
2276
2277
2278 // ----------------------------------------------------------------------------
2279 // Accessors
2280 // ----------------------------------------------------------------------------
2281
2282 void wxRichTextCtrl::SetEditable(bool editable)
2283 {
2284     m_editable = editable;
2285 }
2286
2287 void wxRichTextCtrl::SetInsertionPoint(long pos)
2288 {
2289     SelectNone();
2290
2291     m_caretPosition = pos - 1;
2292
2293     PositionCaret();
2294 }
2295
2296 void wxRichTextCtrl::SetInsertionPointEnd()
2297 {
2298     long pos = GetLastPosition();
2299     SetInsertionPoint(pos);
2300 }
2301
2302 long wxRichTextCtrl::GetInsertionPoint() const
2303 {
2304     return m_caretPosition+1;
2305 }
2306
2307 wxTextPos wxRichTextCtrl::GetLastPosition() const
2308 {
2309     return GetBuffer().GetRange().GetEnd();
2310 }
2311
2312 // If the return values from and to are the same, there is no
2313 // selection.
2314 void wxRichTextCtrl::GetSelection(long* from, long* to) const
2315 {
2316     *from = m_selectionRange.GetStart();
2317     *to = m_selectionRange.GetEnd();
2318     if ((*to) != -1 && (*to) != -2)
2319         (*to) ++;
2320 }
2321
2322 bool wxRichTextCtrl::IsEditable() const
2323 {
2324     return m_editable;
2325 }
2326
2327 // ----------------------------------------------------------------------------
2328 // selection
2329 // ----------------------------------------------------------------------------
2330
2331 void wxRichTextCtrl::SetSelection(long from, long to)
2332 {
2333     // if from and to are both -1, it means (in wxWidgets) that all text should
2334     // be selected.
2335     if ( (from == -1) && (to == -1) )
2336     {
2337         from = 0;
2338         to = GetLastPosition()+1;
2339     }
2340
2341     DoSetSelection(from, to);
2342     SetDefaultStyleToCursorStyle();
2343 }
2344
2345 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
2346 {
2347     if (from == to)
2348     {
2349         SelectNone();
2350     }
2351     else
2352     {
2353         wxRichTextRange oldSelection = m_selectionRange;
2354         m_selectionAnchor = from;
2355         m_selectionRange.SetRange(from, to-1);
2356         if (from > -2)
2357             m_caretPosition = from-1;
2358
2359         RefreshForSelectionChange(oldSelection, m_selectionRange);
2360         PositionCaret();
2361     }
2362 }
2363
2364 // ----------------------------------------------------------------------------
2365 // Editing
2366 // ----------------------------------------------------------------------------
2367
2368 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to),
2369                              const wxString& value)
2370 {
2371     BeginBatchUndo(_("Replace"));
2372
2373     DeleteSelectedContent();
2374
2375     DoWriteText(value, SetValue_SelectionOnly);
2376
2377     EndBatchUndo();
2378 }
2379
2380 void wxRichTextCtrl::Remove(long from, long to)
2381 {
2382     SelectNone();
2383
2384     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to-1), this);
2385
2386     LayoutContent();
2387     if (!IsFrozen())
2388         Refresh(false);
2389 }
2390
2391 bool wxRichTextCtrl::IsModified() const
2392 {
2393     return m_buffer.IsModified();
2394 }
2395
2396 void wxRichTextCtrl::MarkDirty()
2397 {
2398     m_buffer.Modify(true);
2399 }
2400
2401 void wxRichTextCtrl::DiscardEdits()
2402 {
2403     m_caretPositionForDefaultStyle = -2;
2404     m_buffer.Modify(false);
2405     m_buffer.GetCommandProcessor()->ClearCommands();
2406 }
2407
2408 int wxRichTextCtrl::GetNumberOfLines() const
2409 {
2410     return GetBuffer().GetParagraphCount();
2411 }
2412
2413 // ----------------------------------------------------------------------------
2414 // Positions <-> coords
2415 // ----------------------------------------------------------------------------
2416
2417 long wxRichTextCtrl::XYToPosition(long x, long y) const
2418 {
2419     return GetBuffer().XYToPosition(x, y);
2420 }
2421
2422 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2423 {
2424     return GetBuffer().PositionToXY(pos, x, y);
2425 }
2426
2427 // ----------------------------------------------------------------------------
2428 //
2429 // ----------------------------------------------------------------------------
2430
2431 void wxRichTextCtrl::ShowPosition(long pos)
2432 {
2433     if (!IsPositionVisible(pos))
2434         ScrollIntoView(pos-1, WXK_DOWN);
2435 }
2436
2437 int wxRichTextCtrl::GetLineLength(long lineNo) const
2438 {
2439     return GetBuffer().GetParagraphLength(lineNo);
2440 }
2441
2442 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2443 {
2444     return GetBuffer().GetParagraphText(lineNo);
2445 }
2446
2447 // ----------------------------------------------------------------------------
2448 // Undo/redo
2449 // ----------------------------------------------------------------------------
2450
2451 void wxRichTextCtrl::Undo()
2452 {
2453     if (CanUndo())
2454     {
2455         GetCommandProcessor()->Undo();
2456     }
2457 }
2458
2459 void wxRichTextCtrl::Redo()
2460 {
2461     if (CanRedo())
2462     {
2463         GetCommandProcessor()->Redo();
2464     }
2465 }
2466
2467 bool wxRichTextCtrl::CanUndo() const
2468 {
2469     return GetCommandProcessor()->CanUndo();
2470 }
2471
2472 bool wxRichTextCtrl::CanRedo() const
2473 {
2474     return GetCommandProcessor()->CanRedo();
2475 }
2476
2477 // ----------------------------------------------------------------------------
2478 // implementation details
2479 // ----------------------------------------------------------------------------
2480
2481 void wxRichTextCtrl::Command(wxCommandEvent& event)
2482 {
2483     SetValue(event.GetString());
2484     GetEventHandler()->ProcessEvent(event);
2485 }
2486
2487 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2488 {
2489     // By default, load the first file into the text window.
2490     if (event.GetNumberOfFiles() > 0)
2491     {
2492         LoadFile(event.GetFiles()[0]);
2493     }
2494 }
2495
2496 wxSize wxRichTextCtrl::DoGetBestSize() const
2497 {
2498     return wxSize(10, 10);
2499 }
2500
2501 // ----------------------------------------------------------------------------
2502 // standard handlers for standard edit menu events
2503 // ----------------------------------------------------------------------------
2504
2505 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2506 {
2507     Cut();
2508 }
2509
2510 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2511 {
2512     DeleteSelection();
2513 }
2514
2515 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2516 {
2517     Copy();
2518 }
2519
2520 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2521 {
2522     Paste();
2523 }
2524
2525 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2526 {
2527     Undo();
2528 }
2529
2530 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2531 {
2532     Redo();
2533 }
2534
2535 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2536 {
2537     event.Enable( CanCut() );
2538 }
2539
2540 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2541 {
2542     event.Enable( CanCopy() );
2543 }
2544
2545 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2546 {
2547     event.Enable( CanDeleteSelection() );
2548 }
2549
2550 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2551 {
2552     event.Enable( CanPaste() );
2553 }
2554
2555 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2556 {
2557     event.Enable( CanUndo() );
2558     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2559 }
2560
2561 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2562 {
2563     event.Enable( CanRedo() );
2564     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2565 }
2566
2567 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2568 {
2569     SelectAll();
2570 }
2571
2572 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2573 {
2574     event.Enable(GetLastPosition() > 0);
2575 }
2576
2577 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& event)
2578 {
2579     if (event.GetEventObject() != this)
2580     {
2581         event.Skip();
2582         return;
2583     }
2584
2585     if (!m_contextMenu)
2586     {
2587         m_contextMenu = new wxMenu;
2588         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2589         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2590         m_contextMenu->AppendSeparator();
2591         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2592         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2593         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2594         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2595         m_contextMenu->AppendSeparator();
2596         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2597     }
2598     PopupMenu(m_contextMenu);
2599     return;
2600 }
2601
2602 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2603 {
2604     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), wxTextAttr(style));
2605 }
2606
2607 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxTextAttr& style)
2608 {
2609     return GetBuffer().SetStyle(range.ToInternal(), style);
2610 }
2611
2612 // extended style setting operation with flags including:
2613 // wxRICHTEXT_SETSTYLE_WITH_UNDO, wxRICHTEXT_SETSTYLE_OPTIMIZE, wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY.
2614 // see richtextbuffer.h for more details.
2615
2616 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxTextAttr& style, int flags)
2617 {
2618     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2619 }
2620
2621 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2622 {
2623     return GetBuffer().SetDefaultStyle(wxTextAttr(style));
2624 }
2625
2626 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2627 {
2628     return GetBuffer().GetDefaultStyle();
2629 }
2630
2631 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style)
2632 {
2633     return GetBuffer().GetStyle(position, style);
2634 }
2635
2636 // get the common set of styles for the range
2637 bool wxRichTextCtrl::GetStyleForRange(const wxRichTextRange& range, wxTextAttr& style)
2638 {
2639     return GetBuffer().GetStyleForRange(range.ToInternal(), style);
2640 }
2641
2642 /// Get the content (uncombined) attributes for this position.
2643 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttr& style)
2644 {
2645     return GetBuffer().GetUncombinedStyle(position, style);
2646 }
2647
2648 /// Set font, and also the buffer attributes
2649 bool wxRichTextCtrl::SetFont(const wxFont& font)
2650 {
2651     wxControl::SetFont(font);
2652
2653     wxTextAttr attr = GetBuffer().GetAttributes();
2654     attr.SetFont(font);
2655     GetBuffer().SetBasicStyle(attr);
2656
2657     GetBuffer().Invalidate(wxRICHTEXT_ALL);
2658     Refresh(false);
2659
2660     return true;
2661 }
2662
2663 /// Transform logical to physical
2664 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2665 {
2666     wxPoint pt;
2667     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2668
2669     return pt;
2670 }
2671
2672 /// Transform physical to logical
2673 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2674 {
2675     wxPoint pt;
2676     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2677
2678     return pt;
2679 }
2680
2681 /// Position the caret
2682 void wxRichTextCtrl::PositionCaret()
2683 {
2684     if (!GetCaret())
2685         return;
2686
2687     //wxLogDebug(wxT("PositionCaret"));
2688
2689     wxRect caretRect;
2690     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2691     {
2692         wxPoint newPt = caretRect.GetPosition();
2693         wxSize newSz = caretRect.GetSize();
2694         wxPoint pt = GetPhysicalPoint(newPt);
2695         if (GetCaret()->GetPosition() != pt || GetCaret()->GetSize() != newSz)
2696         {
2697             GetCaret()->Move(pt);
2698             GetCaret()->SetSize(newSz);
2699         }
2700     }
2701 }
2702
2703 /// Get the caret height and position for the given character position
2704 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2705 {
2706     wxClientDC dc(this);
2707     dc.SetFont(GetFont());
2708
2709     PrepareDC(dc);
2710
2711     wxPoint pt;
2712     int height = 0;
2713
2714     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2715     {
2716         // Caret height can't be zero
2717         if (height == 0)
2718             height = dc.GetCharHeight();
2719
2720         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2721         return true;
2722     }
2723
2724     return false;
2725 }
2726
2727 /// Gets the line for the visible caret position. If the caret is
2728 /// shown at the very end of the line, it means the next character is actually
2729 /// on the following line. So let's get the line we're expecting to find
2730 /// if this is the case.
2731 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2732 {
2733     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2734     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2735     if (line)
2736     {
2737         wxRichTextRange lineRange = line->GetAbsoluteRange();
2738         if (caretPosition == lineRange.GetStart()-1 &&
2739             (para->GetRange().GetStart() != lineRange.GetStart()))
2740         {
2741             if (!m_caretAtLineStart)
2742                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2743         }
2744     }
2745     return line;
2746 }
2747
2748
2749 /// Move the caret to the given character position
2750 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2751 {
2752     if (GetBuffer().GetDirty())
2753         LayoutContent();
2754
2755     if (pos <= GetBuffer().GetRange().GetEnd())
2756     {
2757         SetCaretPosition(pos, showAtLineStart);
2758
2759         PositionCaret();
2760
2761         return true;
2762     }
2763     else
2764         return false;
2765 }
2766
2767 /// Layout the buffer: which we must do before certain operations, such as
2768 /// setting the caret position.
2769 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2770 {
2771     if (GetBuffer().GetDirty() || onlyVisibleRect)
2772     {
2773         wxRect availableSpace(GetClientSize());
2774         if (availableSpace.width == 0)
2775             availableSpace.width = 10;
2776         if (availableSpace.height == 0)
2777             availableSpace.height = 10;
2778
2779         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2780         if (onlyVisibleRect)
2781         {
2782             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2783             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2784         }
2785
2786         wxClientDC dc(this);
2787         dc.SetFont(GetFont());
2788
2789         PrepareDC(dc);
2790
2791         GetBuffer().Defragment();
2792         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2793         GetBuffer().Layout(dc, availableSpace, flags);
2794         GetBuffer().SetDirty(false);
2795
2796         if (!IsFrozen())
2797             SetupScrollbars();
2798     }
2799
2800     return true;
2801 }
2802
2803 /// Is all of the selection bold?
2804 bool wxRichTextCtrl::IsSelectionBold()
2805 {
2806     if (HasSelection())
2807     {
2808         wxTextAttr attr;
2809         wxRichTextRange range = GetSelectionRange();
2810         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2811         attr.SetFontWeight(wxBOLD);
2812
2813         return HasCharacterAttributes(range, attr);
2814     }
2815     else
2816     {
2817         // If no selection, then we need to combine current style with default style
2818         // to see what the effect would be if we started typing.
2819         wxTextAttr attr;
2820         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2821
2822         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2823         if (GetStyle(pos, attr))
2824         {
2825             if (IsDefaultStyleShowing())
2826                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2827             return attr.GetFontWeight() == wxBOLD;
2828         }
2829     }
2830     return false;
2831 }
2832
2833 /// Is all of the selection italics?
2834 bool wxRichTextCtrl::IsSelectionItalics()
2835 {
2836     if (HasSelection())
2837     {
2838         wxRichTextRange range = GetSelectionRange();
2839         wxTextAttr attr;
2840         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2841         attr.SetFontStyle(wxITALIC);
2842
2843         return HasCharacterAttributes(range, attr);
2844     }
2845     else
2846     {
2847         // If no selection, then we need to combine current style with default style
2848         // to see what the effect would be if we started typing.
2849         wxTextAttr attr;
2850         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2851
2852         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2853         if (GetStyle(pos, attr))
2854         {
2855             if (IsDefaultStyleShowing())
2856                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2857             return attr.GetFontStyle() == wxITALIC;
2858         }
2859     }
2860     return false;
2861 }
2862
2863 /// Is all of the selection underlined?
2864 bool wxRichTextCtrl::IsSelectionUnderlined()
2865 {
2866     if (HasSelection())
2867     {
2868         wxRichTextRange range = GetSelectionRange();
2869         wxTextAttr attr;
2870         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2871         attr.SetFontUnderlined(true);
2872
2873         return HasCharacterAttributes(range, attr);
2874     }
2875     else
2876     {
2877         // If no selection, then we need to combine current style with default style
2878         // to see what the effect would be if we started typing.
2879         wxTextAttr attr;
2880         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2881         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2882
2883         if (GetStyle(pos, attr))
2884         {
2885             if (IsDefaultStyleShowing())
2886                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2887             return attr.GetFontUnderlined();
2888         }
2889     }
2890     return false;
2891 }
2892
2893 /// Apply bold to the selection
2894 bool wxRichTextCtrl::ApplyBoldToSelection()
2895 {
2896     wxTextAttr attr;
2897     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2898     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2899
2900     if (HasSelection())
2901         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2902     else
2903     {
2904         wxRichTextAttr current = GetDefaultStyleEx();
2905         current.Apply(attr);
2906         SetAndShowDefaultStyle(current);
2907     }
2908     return true;
2909 }
2910
2911 /// Apply italic to the selection
2912 bool wxRichTextCtrl::ApplyItalicToSelection()
2913 {
2914     wxTextAttr attr;
2915     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2916     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2917
2918     if (HasSelection())
2919         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2920     else
2921     {
2922         wxRichTextAttr current = GetDefaultStyleEx();
2923         current.Apply(attr);
2924         SetAndShowDefaultStyle(current);
2925     }
2926     return true;
2927 }
2928
2929 /// Apply underline to the selection
2930 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2931 {
2932     wxTextAttr attr;
2933     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2934     attr.SetFontUnderlined(!IsSelectionUnderlined());
2935
2936     if (HasSelection())
2937         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2938     else
2939     {
2940         wxRichTextAttr current = GetDefaultStyleEx();
2941         current.Apply(attr);
2942         SetAndShowDefaultStyle(current);
2943     }
2944     return true;
2945 }
2946
2947 /// Is all of the selection aligned according to the specified flag?
2948 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment)
2949 {
2950     wxRichTextRange range;
2951     if (HasSelection())
2952         range = GetSelectionRange();
2953     else
2954         range = wxRichTextRange(GetCaretPosition()+1, GetCaretPosition()+2);
2955
2956     wxTextAttr attr;
2957     attr.SetAlignment(alignment);
2958
2959     return HasParagraphAttributes(range, attr);
2960 }
2961
2962 /// Apply alignment to the selection
2963 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2964 {
2965     wxTextAttr attr;
2966     attr.SetAlignment(alignment);
2967     if (HasSelection())
2968         return SetStyle(GetSelectionRange(), attr);
2969     else
2970     {
2971         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2972         if (para)
2973             return SetStyleEx(para->GetRange().FromInternal(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY);
2974     }
2975     return true;
2976 }
2977
2978 /// Apply a named style to the selection
2979 bool wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
2980 {
2981     // Flags are defined within each definition, so only certain
2982     // attributes are applied.
2983     wxTextAttr attr(GetStyleSheet() ? def->GetStyleMergedWithBase(GetStyleSheet()) : def->GetStyle());
2984
2985     int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_RESET;
2986
2987     if (def->IsKindOf(CLASSINFO(wxRichTextListStyleDefinition)))
2988     {
2989         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
2990
2991         wxRichTextRange range;
2992
2993         if (HasSelection())
2994             range = GetSelectionRange();
2995         else
2996         {
2997             long pos = GetAdjustedCaretPosition(GetCaretPosition());
2998             range = wxRichTextRange(pos, pos+1);
2999         }
3000
3001         return SetListStyle(range, (wxRichTextListStyleDefinition*) def, flags);
3002     }
3003
3004     // Make sure the attr has the style name
3005     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
3006     {
3007         attr.SetParagraphStyleName(def->GetName());
3008
3009         // If applying a paragraph style, we only want the paragraph nodes to adopt these
3010         // attributes, and not the leaf nodes. This will allow the content (e.g. text)
3011         // to change its style independently.
3012         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
3013     }
3014     else
3015         attr.SetCharacterStyleName(def->GetName());
3016
3017     if (HasSelection())
3018         return SetStyleEx(GetSelectionRange(), attr, flags);
3019     else
3020     {
3021         wxRichTextAttr current = GetDefaultStyleEx();
3022         current.Apply(attr);
3023         SetAndShowDefaultStyle(current);
3024         return true;
3025     }
3026 }
3027
3028 /// Apply the style sheet to the buffer, for example if the styles have changed.
3029 bool wxRichTextCtrl::ApplyStyleSheet(wxRichTextStyleSheet* styleSheet)
3030 {
3031     if (!styleSheet)
3032         styleSheet = GetBuffer().GetStyleSheet();
3033     if (!styleSheet)
3034         return false;
3035
3036     if (GetBuffer().ApplyStyleSheet(styleSheet))
3037     {
3038         GetBuffer().Invalidate(wxRICHTEXT_ALL);
3039         Refresh(false);
3040         return true;
3041     }
3042     else
3043         return false;
3044 }
3045
3046 /// Sets the default style to the style under the cursor
3047 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
3048 {
3049     wxTextAttr attr;
3050     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
3051
3052     // If at the start of a paragraph, use the next position.
3053     long pos = GetAdjustedCaretPosition(GetCaretPosition());
3054
3055     if (GetUncombinedStyle(pos, attr))
3056     {
3057         SetDefaultStyle(attr);
3058         return true;
3059     }
3060
3061     return false;
3062 }
3063
3064 /// Returns the first visible position in the current view
3065 long wxRichTextCtrl::GetFirstVisiblePosition() const
3066 {
3067     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
3068     if (line)
3069         return line->GetAbsoluteRange().GetStart();
3070     else
3071         return 0;
3072 }
3073
3074 /// Get the first visible point in the window
3075 wxPoint wxRichTextCtrl::GetFirstVisiblePoint() const
3076 {
3077     int ppuX, ppuY;
3078     int startXUnits, startYUnits;
3079
3080     GetScrollPixelsPerUnit(& ppuX, & ppuY);
3081     GetViewStart(& startXUnits, & startYUnits);
3082
3083     return wxPoint(startXUnits * ppuX, startYUnits * ppuY);
3084 }
3085
3086 /// The adjusted caret position is the character position adjusted to take
3087 /// into account whether we're at the start of a paragraph, in which case
3088 /// style information should be taken from the next position, not current one.
3089 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
3090 {
3091     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
3092
3093     if (para && (caretPos+1 == para->GetRange().GetStart()))
3094         caretPos ++;
3095     return caretPos;
3096 }
3097
3098 /// Get/set the selection range in character positions. -1, -1 means no selection.
3099 /// The range is in API convention, i.e. a single character selection is denoted
3100 /// by (n, n+1)
3101 wxRichTextRange wxRichTextCtrl::GetSelectionRange() const
3102 {
3103     wxRichTextRange range = GetInternalSelectionRange();
3104     if (range != wxRichTextRange(-2,-2) && range != wxRichTextRange(-1,-1))
3105         range.SetEnd(range.GetEnd() + 1);
3106     return range;
3107 }
3108
3109 void wxRichTextCtrl::SetSelectionRange(const wxRichTextRange& range)
3110 {
3111     wxRichTextRange range1(range);
3112     if (range1 != wxRichTextRange(-2,-2) && range1 != wxRichTextRange(-1,-1) )
3113         range1.SetEnd(range1.GetEnd() - 1);
3114
3115     wxASSERT( range1.GetStart() > range1.GetEnd() );
3116
3117     SetInternalSelectionRange(range1);
3118 }
3119
3120 /// Set list style
3121 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3122 {
3123     return GetBuffer().SetListStyle(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3124 }
3125
3126 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3127 {
3128     return GetBuffer().SetListStyle(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3129 }
3130
3131 /// Clear list for given range
3132 bool wxRichTextCtrl::ClearListStyle(const wxRichTextRange& range, int flags)
3133 {
3134     return GetBuffer().ClearListStyle(range.ToInternal(), flags);
3135 }
3136
3137 /// Number/renumber any list elements in the given range
3138 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3139 {
3140     return GetBuffer().NumberList(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3141 }
3142
3143 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3144 {
3145     return GetBuffer().NumberList(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3146 }
3147
3148 /// Promote the list items within the given range. promoteBy can be a positive or negative number, e.g. 1 or -1
3149 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int specifiedLevel)
3150 {
3151     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), def, flags, specifiedLevel);
3152 }
3153
3154 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, const wxString& defName, int flags, int specifiedLevel)
3155 {
3156     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), defName, flags, specifiedLevel);
3157 }
3158
3159 /// Deletes the content in the given range
3160 bool wxRichTextCtrl::Delete(const wxRichTextRange& range)
3161 {
3162     return GetBuffer().DeleteRangeWithUndo(range.ToInternal(), this);
3163 }
3164
3165 const wxArrayString& wxRichTextCtrl::GetAvailableFontNames()
3166 {
3167     if (sm_availableFontNames.GetCount() == 0)
3168     {
3169         sm_availableFontNames = wxFontEnumerator::GetFacenames();
3170         sm_availableFontNames.Sort();
3171     }
3172     return sm_availableFontNames;
3173 }
3174
3175 void wxRichTextCtrl::ClearAvailableFontNames()
3176 {
3177     sm_availableFontNames.Clear();
3178 }
3179
3180 void wxRichTextCtrl::OnSysColourChanged(wxSysColourChangedEvent& WXUNUSED(event))
3181 {
3182     //wxLogDebug(wxT("wxRichTextCtrl::OnSysColourChanged"));
3183
3184     wxTextAttrEx basicStyle = GetBasicStyle();
3185     basicStyle.SetTextColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
3186     SetBasicStyle(basicStyle);
3187     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
3188
3189     Refresh();
3190 }
3191
3192 // Refresh the area affected by a selection change
3193 bool wxRichTextCtrl::RefreshForSelectionChange(const wxRichTextRange& oldSelection, const wxRichTextRange& newSelection)
3194 {
3195     // Calculate the refresh rectangle - just the affected lines
3196     long firstPos, lastPos;
3197     if (oldSelection.GetStart() == -2 && newSelection.GetStart() != -2)
3198     {
3199         firstPos = newSelection.GetStart();
3200         lastPos = newSelection.GetEnd();
3201     }
3202     else if (oldSelection.GetStart() != -2 && newSelection.GetStart() == -2)
3203     {
3204         firstPos = oldSelection.GetStart();
3205         lastPos = oldSelection.GetEnd();
3206     }
3207     else if (oldSelection.GetStart() == -2 && newSelection.GetStart() == -2)
3208     {
3209         return false;
3210     }
3211     else
3212     {
3213         firstPos = wxMin(oldSelection.GetStart(), newSelection.GetStart());
3214         lastPos = wxMax(oldSelection.GetEnd(), newSelection.GetEnd());
3215     }
3216
3217     wxRichTextLine* firstLine = GetBuffer().GetLineAtPosition(firstPos);
3218     wxRichTextLine* lastLine = GetBuffer().GetLineAtPosition(lastPos);
3219
3220     if (firstLine && lastLine)
3221     {
3222         wxSize clientSize = GetClientSize();
3223         wxPoint pt1 = GetPhysicalPoint(firstLine->GetAbsolutePosition());
3224         wxPoint pt2 = GetPhysicalPoint(lastLine->GetAbsolutePosition()) + wxPoint(0, lastLine->GetSize().y);
3225
3226         pt1.x = 0;
3227         pt1.y = wxMax(0, pt1.y);
3228         pt2.x = 0;
3229         pt2.y = wxMin(clientSize.y, pt2.y);
3230
3231         wxRect rect(pt1, wxSize(clientSize.x, pt2.y - pt1.y));
3232         RefreshRect(rect, false);
3233     }
3234     else
3235         Refresh(false);
3236
3237     return true;
3238 }
3239
3240 #endif
3241     // wxUSE_RICHTEXT