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
  58 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
  59
  60 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
  61
  62 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
  63     EVT_PAINT(wxRichTextCtrl::OnPaint)
  64     EVT_ERASE_BACKGROUND(wxRichTextCtrl::OnEraseBackground)
  65     EVT_IDLE(wxRichTextCtrl::OnIdle)
  66     EVT_SCROLLWIN(wxRichTextCtrl::OnScroll)
  67     EVT_LEFT_DOWN(wxRichTextCtrl::OnLeftClick)
  68     EVT_MOTION(wxRichTextCtrl::OnMoveMouse)
  69     EVT_LEFT_UP(wxRichTextCtrl::OnLeftUp)
  70     EVT_RIGHT_DOWN(wxRichTextCtrl::OnRightClick)
  71     EVT_MIDDLE_DOWN(wxRichTextCtrl::OnMiddleClick)
  72     EVT_LEFT_DCLICK(wxRichTextCtrl::OnLeftDClick)
  73     EVT_CHAR(wxRichTextCtrl::OnChar)
  74     EVT_SIZE(wxRichTextCtrl::OnSize)
  75     EVT_SET_FOCUS(wxRichTextCtrl::OnSetFocus)
  76     EVT_KILL_FOCUS(wxRichTextCtrl::OnKillFocus)
  77     EVT_MOUSE_CAPTURE_LOST(wxRichTextCtrl::OnCaptureLost)
  78     EVT_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
  79
  80     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
  81     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
  82
  83     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
  84     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
  85
  86     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
  87     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
  88
  89     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
  90     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
  91
  92     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
  93     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
  94
  95     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
  96     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
  97
  98     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
  99     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
 100 END_EVENT_TABLE()
 101
 102 /*!
 103  * wxRichTextCtrl
 104  */
 105
 106 wxArrayString wxRichTextCtrl::sm_availableFontNames;
 107
 108 wxRichTextCtrl::wxRichTextCtrl()
 109               : wxScrollHelper(this)
 110 {
 111     Init();
 112 }
 113
 114 wxRichTextCtrl::wxRichTextCtrl(wxWindow* parent,
 115                                wxWindowID id,
 116                                const wxString& value,
 117                                const wxPoint& pos,
 118                                const wxSize& size,
 119                                long style,
 120                                const wxValidator& validator,
 121                                const wxString& name)
 122               : wxScrollHelper(this)
 123 {
 124     Init();
 125     Create(parent, id, value, pos, size, style, validator, name);
 126 }
 127
 128 /// Creation
 129 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style,
 130                              const wxValidator& validator, const wxString& name)
 131 {
 132     if (!wxTextCtrlBase::Create(parent, id, pos, size,
 133                                 style|wxFULL_REPAINT_ON_RESIZE,
 134                                 validator, name))
 135         return false;
 136
 137     if (!GetFont().Ok())
 138     {
 139         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 140     }
 141
 142     GetBuffer().Reset();
 143     GetBuffer().SetRichTextCtrl(this);
 144
 145     SetCaret(new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16));
 146     GetCaret()->Show();
 147
 148     if (style & wxTE_READONLY)
 149         SetEditable(false);
 150
 151     // The base attributes must all have default values
 152     wxTextAttrEx attributes;
 153     attributes.SetFont(GetFont());
 154     attributes.SetTextColour(*wxBLACK);
 155     attributes.SetBackgroundColour(*wxWHITE);
 156     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 157     attributes.SetLineSpacing(10);
 158     attributes.SetParagraphSpacingAfter(10);
 159     attributes.SetParagraphSpacingBefore(0);
 160     attributes.SetTextEffects(0);
 161     attributes.SetTextEffectFlags(wxTEXT_ATTR_EFFECT_STRIKETHROUGH|wxTEXT_ATTR_EFFECT_CAPITALS);
 162
 163     SetBasicStyle(attributes);
 164
 165     // The default attributes will be merged with base attributes, so
 166     // can be empty to begin with
 167     wxTextAttrEx defaultAttributes;
 168     SetDefaultStyle(defaultAttributes);
 169
 170     SetBackgroundColour(*wxWHITE);
 171     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 172
 173     // Tell the sizers to use the given or best size
 174     SetInitialSize(size);
 175
 176 #if wxRICHTEXT_BUFFERED_PAINTING
 177     // Create a buffer
 178     RecreateBuffer(size);
 179 #endif
 180
 181     m_textCursor = wxCursor(wxCURSOR_IBEAM);
 182     m_urlCursor = wxCursor(wxCURSOR_HAND);
 183
 184     SetCursor(m_textCursor);
 185
 186     if (!value.IsEmpty())
 187         SetValue(value);
 188
 189     GetBuffer().AddEventHandler(this);
 190
 191     return true;
 192 }
 193
 194 wxRichTextCtrl::~wxRichTextCtrl()
 195 {
 196     GetBuffer().RemoveEventHandler(this);
 197
 198     delete m_contextMenu;
 199 }
 200
 201 /// Member initialisation
 202 void wxRichTextCtrl::Init()
 203 {
 204     m_freezeCount = 0;
 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 /// Call Freeze to prevent refresh
 221 void wxRichTextCtrl::Freeze()
 222 {
 223     m_freezeCount ++;
 224 }
 225
 226 /// Call Thaw to refresh
 227 void wxRichTextCtrl::Thaw()
 228 {
 229     m_freezeCount --;
 230
 231     if (m_freezeCount == 0)
 232     {
 233         SetupScrollbars();
 234         Refresh(false);
 235     }
 236 }
 237
 238 /// Clear all text
 239 void wxRichTextCtrl::Clear()
 240 {
 241     m_buffer.ResetAndClearCommands();
 242     m_buffer.SetDirty(true);
 243     m_caretPosition = -1;
 244     m_caretPositionForDefaultStyle = -2;
 245     m_caretAtLineStart = false;
 246     m_selectionRange.SetRange(-2, -2);
 247
 248     SetScrollbars(0, 0, 0, 0, 0, 0);
 249
 250     if (m_freezeCount == 0)
 251     {
 252         SetupScrollbars();
 253         Refresh(false);
 254     }
 255     SendTextUpdatedEvent();
 256 }
 257
 258 /// Painting
 259 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 260 {
 261     if (GetCaret() && GetCaret()->IsVisible())
 262         GetCaret()->Hide();
 263
 264     {
 265 #if wxRICHTEXT_BUFFERED_PAINTING
 266         wxBufferedPaintDC dc(this, m_bufferBitmap);
 267 #else
 268         wxPaintDC dc(this);
 269 #endif
 270         PrepareDC(dc);
 271
 272         if (m_freezeCount > 0)
 273             return;
 274
 275         dc.SetFont(GetFont());
 276
 277         // Paint the background
 278         PaintBackground(dc);
 279
 280         // wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 281
 282         wxRect drawingArea(GetUpdateRegion().GetBox());
 283         drawingArea.SetPosition(GetLogicalPoint(drawingArea.GetPosition()));
 284
 285         wxRect availableSpace(GetClientSize());
 286         if (GetBuffer().GetDirty())
 287         {
 288             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 289             GetBuffer().SetDirty(false);
 290             SetupScrollbars();
 291         }
 292
 293         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetInternalSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 294     }
 295
 296     if (GetCaret() && !GetCaret()->IsVisible())
 297         GetCaret()->Show();
 298
 299     PositionCaret();
 300 }
 301
 302 // Empty implementation, to prevent flicker
 303 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 304 {
 305 }
 306
 307 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 308 {
 309     if (GetCaret())
 310     {
 311         if (!GetCaret()->IsVisible())
 312             GetCaret()->Show();
 313         PositionCaret();
 314     }
 315
 316     // if (!IsFrozen())
 317     //    Refresh(false);
 318 }
 319
 320 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 321 {
 322     if (GetCaret() && GetCaret()->IsVisible())
 323         GetCaret()->Hide();
 324
 325     // if (!IsFrozen())
 326     //    Refresh(false);
 327 }
 328
 329 void wxRichTextCtrl::OnCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
 330 {
 331     m_dragging = false;
 332 }
 333
 334 /// Left-click
 335 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 336 {
 337     SetFocus();
 338
 339     wxClientDC dc(this);
 340     PrepareDC(dc);
 341     dc.SetFont(GetFont());
 342
 343     long position = 0;
 344     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 345
 346     if (hit != wxRICHTEXT_HITTEST_NONE)
 347     {
 348         m_dragStart = event.GetLogicalPosition(dc);
 349         m_dragging = true;
 350         CaptureMouse();
 351
 352         SelectNone();
 353
 354         bool caretAtLineStart = false;
 355
 356         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 357         {
 358             // If we're at the start of a line (but not first in para)
 359             // then we should keep the caret showing at the start of the line
 360             // by showing the m_caretAtLineStart flag.
 361             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 362             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 363
 364             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 365                 caretAtLineStart = true;
 366             position --;
 367         }
 368
 369         MoveCaret(position, caretAtLineStart);
 370         SetDefaultStyleToCursorStyle();
 371     }
 372
 373     event.Skip();
 374 }
 375
 376 /// Left-up
 377 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& event)
 378 {
 379     if (m_dragging)
 380     {
 381         m_dragging = false;
 382         if (GetCapture() == this)
 383             ReleaseMouse();
 384
 385         // See if we clicked on a URL
 386         wxClientDC dc(this);
 387         PrepareDC(dc);
 388         dc.SetFont(GetFont());
 389
 390         long position = 0;
 391         wxPoint logicalPt = event.GetLogicalPosition(dc);
 392         int hit = GetBuffer().HitTest(dc, logicalPt, position);
 393
 394         if (hit != wxRICHTEXT_HITTEST_NONE)
 395         {
 396             wxTextAttrEx attr;
 397             if (GetStyle(position, attr))
 398             {
 399                 if (attr.HasFlag(wxTEXT_ATTR_URL))
 400                 {
 401                     wxString urlTarget = attr.GetURL();
 402                     if (!urlTarget.IsEmpty())
 403                     {
 404                         wxMouseEvent mouseEvent(event);
 405
 406                         long startPos = 0, endPos = 0;
 407                         wxRichTextObject* obj = GetBuffer().GetLeafObjectAtPosition(position);
 408                         if (obj)
 409                         {
 410                             startPos = obj->GetRange().GetStart();
 411                             endPos = obj->GetRange().GetEnd();
 412                         }
 413
 414                         wxTextUrlEvent urlEvent(GetId(), mouseEvent, startPos, endPos);
 415                         InitCommandEvent(urlEvent);
 416
 417                         urlEvent.SetString(urlTarget);
 418
 419                         GetEventHandler()->ProcessEvent(urlEvent);
 420                     }
 421                 }
 422             }
 423         }
 424     }
 425 }
 426
 427 /// Left-click
 428 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 429 {
 430     wxClientDC dc(this);
 431     PrepareDC(dc);
 432     dc.SetFont(GetFont());
 433
 434     long position = 0;
 435     wxPoint logicalPt = event.GetLogicalPosition(dc);
 436     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 437
 438     // See if we need to change the cursor
 439
 440     {
 441         if (hit != wxRICHTEXT_HITTEST_NONE && !(hit & wxRICHTEXT_HITTEST_OUTSIDE))
 442         {
 443             wxTextAttrEx attr;
 444             if (GetStyle(position, attr))
 445             {
 446                 if (attr.HasFlag(wxTEXT_ATTR_URL))
 447                 {
 448                     SetCursor(m_urlCursor);
 449                 }
 450                 else if (!attr.HasFlag(wxTEXT_ATTR_URL))
 451                 {
 452                     SetCursor(m_textCursor);
 453                 }
 454             }
 455         }
 456         else
 457             SetCursor(m_textCursor);
 458     }
 459
 460     if (!event.Dragging())
 461     {
 462         event.Skip();
 463         return;
 464     }
 465
 466     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 467     {
 468         // TODO: test closeness
 469
 470         bool caretAtLineStart = false;
 471
 472         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 473         {
 474             // If we're at the start of a line (but not first in para)
 475             // then we should keep the caret showing at the start of the line
 476             // by showing the m_caretAtLineStart flag.
 477             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 478             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 479
 480             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 481                 caretAtLineStart = true;
 482             position --;
 483         }
 484
 485         if (m_caretPosition != position)
 486         {
 487             bool extendSel = ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 488
 489             MoveCaret(position, caretAtLineStart);
 490             SetDefaultStyleToCursorStyle();
 491
 492             if (extendSel)
 493                 Refresh(false);
 494         }
 495     }
 496 }
 497
 498 /// Right-click
 499 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 500 {
 501     SetFocus();
 502     event.Skip();
 503 }
 504
 505 /// Left-double-click
 506 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& event)
 507 {
 508     SelectWord(GetCaretPosition()+1);
 509     event.Skip();
 510 }
 511
 512 /// Middle-click
 513 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 514 {
 515     event.Skip();
 516 }
 517
 518 /// Key press
 519 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 520 {
 521     int flags = 0;
 522     if (event.CmdDown())
 523         flags |= wxRICHTEXT_CTRL_DOWN;
 524     if (event.ShiftDown())
 525         flags |= wxRICHTEXT_SHIFT_DOWN;
 526     if (event.AltDown())
 527         flags |= wxRICHTEXT_ALT_DOWN;
 528
 529     if (event.GetKeyCode() == WXK_LEFT ||
 530         event.GetKeyCode() == WXK_RIGHT ||
 531         event.GetKeyCode() == WXK_UP ||
 532         event.GetKeyCode() == WXK_DOWN ||
 533         event.GetKeyCode() == WXK_HOME ||
 534         event.GetKeyCode() == WXK_PAGEUP ||
 535         event.GetKeyCode() == WXK_PAGEDOWN ||
 536         event.GetKeyCode() == WXK_END ||
 537
 538         event.GetKeyCode() == WXK_NUMPAD_LEFT ||
 539         event.GetKeyCode() == WXK_NUMPAD_RIGHT ||
 540         event.GetKeyCode() == WXK_NUMPAD_UP ||
 541         event.GetKeyCode() == WXK_NUMPAD_DOWN ||
 542         event.GetKeyCode() == WXK_NUMPAD_HOME ||
 543         event.GetKeyCode() == WXK_NUMPAD_PAGEUP ||
 544         event.GetKeyCode() == WXK_NUMPAD_PAGEDOWN ||
 545         event.GetKeyCode() == WXK_NUMPAD_END)
 546     {
 547         KeyboardNavigate(event.GetKeyCode(), flags);
 548         return;
 549     }
 550
 551     // all the other keys modify the controls contents which shouldn't be
 552     // possible if we're read-only
 553     if ( !IsEditable() )
 554     {
 555         event.Skip();
 556         return;
 557     }
 558
 559     if (event.GetKeyCode() == WXK_RETURN)
 560     {
 561         BeginBatchUndo(_("Insert Text"));
 562
 563         long newPos = m_caretPosition;
 564
 565         DeleteSelectedContent(& newPos);
 566
 567         if (event.ShiftDown())
 568         {
 569             wxString text;
 570             text = wxRichTextLineBreakChar;
 571             GetBuffer().InsertTextWithUndo(newPos+1, text, this);
 572         }
 573         else
 574             GetBuffer().InsertNewlineWithUndo(newPos+1, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
 575
 576         EndBatchUndo();
 577         SetDefaultStyleToCursorStyle();
 578
 579         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 580
 581         wxRichTextEvent cmdEvent(
 582             wxEVT_COMMAND_RICHTEXT_RETURN,
 583             GetId());
 584         cmdEvent.SetEventObject(this);
 585         cmdEvent.SetFlags(flags);
 586         cmdEvent.SetPosition(newPos+1);
 587
 588         if (!GetEventHandler()->ProcessEvent(cmdEvent))
 589         {
 590             // Generate conventional event
 591             wxCommandEvent textEvent(wxEVT_COMMAND_TEXT_ENTER, GetId());
 592             InitCommandEvent(textEvent);
 593
 594             GetEventHandler()->ProcessEvent(textEvent);
 595         }
 596         Update();
 597     }
 598     else if (event.GetKeyCode() == WXK_BACK)
 599     {
 600         BeginBatchUndo(_("Delete Text"));
 601
 602         // Submit range in character positions, which are greater than caret positions,
 603         // so subtract 1 for deleted character and add 1 for conversion to character position.
 604         if (m_caretPosition > -1 && !HasSelection())
 605         {
 606             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition, m_caretPosition), this);
 607         }
 608         else
 609             DeleteSelectedContent();
 610
 611         EndBatchUndo();
 612
 613         if (GetLastPosition() == -1)
 614         {
 615             GetBuffer().Reset();
 616
 617             m_caretPosition = -1;
 618             PositionCaret();
 619             SetDefaultStyleToCursorStyle();
 620         }
 621
 622         ScrollIntoView(m_caretPosition, WXK_LEFT);
 623
 624         wxRichTextEvent cmdEvent(
 625             wxEVT_COMMAND_RICHTEXT_DELETE,
 626             GetId());
 627         cmdEvent.SetEventObject(this);
 628         cmdEvent.SetFlags(flags);
 629         cmdEvent.SetPosition(m_caretPosition+1);
 630         GetEventHandler()->ProcessEvent(cmdEvent);
 631
 632         Update();
 633     }
 634     else if (event.GetKeyCode() == WXK_DELETE)
 635     {
 636         BeginBatchUndo(_("Delete Text"));
 637
 638         // Submit range in character positions, which are greater than caret positions,
 639         if (m_caretPosition < GetBuffer().GetRange().GetEnd()+1 && !HasSelection())
 640         {
 641             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition+1, m_caretPosition+1), this);
 642         }
 643         else
 644             DeleteSelectedContent();
 645
 646         EndBatchUndo();
 647
 648         if (GetLastPosition() == -1)
 649         {
 650             GetBuffer().Reset();
 651
 652             m_caretPosition = -1;
 653             PositionCaret();
 654             SetDefaultStyleToCursorStyle();
 655         }
 656
 657         wxRichTextEvent cmdEvent(
 658             wxEVT_COMMAND_RICHTEXT_DELETE,
 659             GetId());
 660         cmdEvent.SetEventObject(this);
 661         cmdEvent.SetFlags(flags);
 662         cmdEvent.SetPosition(m_caretPosition+1);
 663         GetEventHandler()->ProcessEvent(cmdEvent);
 664
 665         Update();
 666     }
 667     else
 668     {
 669         long keycode = event.GetKeyCode();
 670         switch ( keycode )
 671         {
 672             case WXK_ESCAPE:
 673             case WXK_DELETE:
 674             case WXK_START:
 675             case WXK_LBUTTON:
 676             case WXK_RBUTTON:
 677             case WXK_CANCEL:
 678             case WXK_MBUTTON:
 679             case WXK_CLEAR:
 680             case WXK_SHIFT:
 681             case WXK_ALT:
 682             case WXK_CONTROL:
 683             case WXK_MENU:
 684             case WXK_PAUSE:
 685             case WXK_CAPITAL:
 686             case WXK_END:
 687             case WXK_HOME:
 688             case WXK_LEFT:
 689             case WXK_UP:
 690             case WXK_RIGHT:
 691             case WXK_DOWN:
 692             case WXK_SELECT:
 693             case WXK_PRINT:
 694             case WXK_EXECUTE:
 695             case WXK_SNAPSHOT:
 696             case WXK_INSERT:
 697             case WXK_HELP:
 698             case WXK_NUMPAD0:
 699             case WXK_NUMPAD1:
 700             case WXK_NUMPAD2:
 701             case WXK_NUMPAD3:
 702             case WXK_NUMPAD4:
 703             case WXK_NUMPAD5:
 704             case WXK_NUMPAD6:
 705             case WXK_NUMPAD7:
 706             case WXK_NUMPAD8:
 707             case WXK_NUMPAD9:
 708             case WXK_MULTIPLY:
 709             case WXK_ADD:
 710             case WXK_SEPARATOR:
 711             case WXK_SUBTRACT:
 712             case WXK_DECIMAL:
 713             case WXK_DIVIDE:
 714             case WXK_F1:
 715             case WXK_F2:
 716             case WXK_F3:
 717             case WXK_F4:
 718             case WXK_F5:
 719             case WXK_F6:
 720             case WXK_F7:
 721             case WXK_F8:
 722             case WXK_F9:
 723             case WXK_F10:
 724             case WXK_F11:
 725             case WXK_F12:
 726             case WXK_F13:
 727             case WXK_F14:
 728             case WXK_F15:
 729             case WXK_F16:
 730             case WXK_F17:
 731             case WXK_F18:
 732             case WXK_F19:
 733             case WXK_F20:
 734             case WXK_F21:
 735             case WXK_F22:
 736             case WXK_F23:
 737             case WXK_F24:
 738             case WXK_NUMLOCK:
 739             case WXK_SCROLL:
 740             case WXK_PAGEUP:
 741             case WXK_PAGEDOWN:
 742             case WXK_NUMPAD_SPACE:
 743             case WXK_NUMPAD_TAB:
 744             case WXK_NUMPAD_ENTER:
 745             case WXK_NUMPAD_F1:
 746             case WXK_NUMPAD_F2:
 747             case WXK_NUMPAD_F3:
 748             case WXK_NUMPAD_F4:
 749             case WXK_NUMPAD_HOME:
 750             case WXK_NUMPAD_LEFT:
 751             case WXK_NUMPAD_UP:
 752             case WXK_NUMPAD_RIGHT:
 753             case WXK_NUMPAD_DOWN:
 754             case WXK_NUMPAD_PAGEUP:
 755             case WXK_NUMPAD_PAGEDOWN:
 756             case WXK_NUMPAD_END:
 757             case WXK_NUMPAD_BEGIN:
 758             case WXK_NUMPAD_INSERT:
 759             case WXK_NUMPAD_DELETE:
 760             case WXK_NUMPAD_EQUAL:
 761             case WXK_NUMPAD_MULTIPLY:
 762             case WXK_NUMPAD_ADD:
 763             case WXK_NUMPAD_SEPARATOR:
 764             case WXK_NUMPAD_SUBTRACT:
 765             case WXK_NUMPAD_DECIMAL:
 766             case WXK_WINDOWS_LEFT:
 767             {
 768                 event.Skip();
 769                 return;
 770             }
 771
 772             default:
 773             {
 774                 if (event.CmdDown() || event.AltDown())
 775                 {
 776                     event.Skip();
 777                     return;
 778                 }
 779
 780                 wxRichTextEvent cmdEvent(
 781                     wxEVT_COMMAND_RICHTEXT_CHARACTER,
 782                     GetId());
 783                 cmdEvent.SetEventObject(this);
 784                 cmdEvent.SetFlags(flags);
 785                 cmdEvent.SetCharacter((wxChar) keycode);
 786                 cmdEvent.SetPosition(m_caretPosition+1);
 787
 788                 if (keycode == wxT('\t'))
 789                 {
 790                     // See if we need to promote or demote the selection or paragraph at the cursor
 791                     // position, instead of inserting a tab.
 792                     long pos = GetAdjustedCaretPosition(GetCaretPosition());
 793                     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos);
 794                     if (para && para->GetRange().GetStart() == pos && para->GetAttributes().HasListStyleName())
 795                     {
 796                         wxRichTextRange range;
 797                         if (HasSelection())
 798                             range = GetSelectionRange();
 799                         else
 800                             range = para->GetRange().FromInternal();
 801
 802                         int promoteBy = event.ShiftDown() ? 1 : -1;
 803
 804                         PromoteList(promoteBy, range, NULL);
 805
 806                         GetEventHandler()->ProcessEvent(cmdEvent);
 807
 808                         return;
 809                     }
 810                 }
 811
 812                 BeginBatchUndo(_("Insert Text"));
 813
 814                 long newPos = m_caretPosition;
 815                 DeleteSelectedContent(& newPos);
 816
 817                 wxString str = (wxChar) event.GetKeyCode();
 818                 GetBuffer().InsertTextWithUndo(newPos+1, str, this, 0);
 819
 820                 EndBatchUndo();
 821
 822                 SetDefaultStyleToCursorStyle();
 823                 ScrollIntoView(m_caretPosition, WXK_RIGHT);
 824
 825                 GetEventHandler()->ProcessEvent(cmdEvent);
 826
 827                 Update();
 828             }
 829         }
 830     }
 831 }
 832
 833 /// Delete content if there is a selection, e.g. when pressing a key.
 834 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
 835 {
 836     if (HasSelection())
 837     {
 838         long pos = m_selectionRange.GetStart();
 839         GetBuffer().DeleteRangeWithUndo(m_selectionRange, this);
 840         m_selectionRange.SetRange(-2, -2);
 841
 842         if (newPos)
 843             *newPos = pos-1;
 844         return true;
 845     }
 846     else
 847         return false;
 848 }
 849
 850 /// Keyboard navigation
 851
 852 /*
 853
 854 Left:       left one character
 855 Right:      right one character
 856 Up:         up one line
 857 Down:       down one line
 858 Ctrl-Left:  left one word
 859 Ctrl-Right: right one word
 860 Ctrl-Up:    previous paragraph start
 861 Ctrl-Down:  next start of paragraph
 862 Home:       start of line
 863 End:        end of line
 864 Ctrl-Home:  start of document
 865 Ctrl-End:   end of document
 866 Page-Up:    Up a screen
 867 Page-Down:  Down a screen
 868
 869 Maybe:
 870
 871 Ctrl-Alt-PgUp: Start of window
 872 Ctrl-Alt-PgDn: End of window
 873 F8:         Start selection mode
 874 Esc:        End selection mode
 875
 876 Adding Shift does the above but starts/extends selection.
 877
 878
 879  */
 880
 881 bool wxRichTextCtrl::KeyboardNavigate(int keyCode, int flags)
 882 {
 883     bool success = false;
 884
 885     if (keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_RIGHT)
 886     {
 887         if (flags & wxRICHTEXT_CTRL_DOWN)
 888             success = WordRight(1, flags);
 889         else
 890             success = MoveRight(1, flags);
 891     }
 892     else if (keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT)
 893     {
 894         if (flags & wxRICHTEXT_CTRL_DOWN)
 895             success = WordLeft(1, flags);
 896         else
 897             success = MoveLeft(1, flags);
 898     }
 899     else if (keyCode == WXK_UP || keyCode == WXK_NUMPAD_UP)
 900     {
 901         if (flags & wxRICHTEXT_CTRL_DOWN)
 902             success = MoveToParagraphStart(flags);
 903         else
 904             success = MoveUp(1, flags);
 905     }
 906     else if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN)
 907     {
 908         if (flags & wxRICHTEXT_CTRL_DOWN)
 909             success = MoveToParagraphEnd(flags);
 910         else
 911             success = MoveDown(1, flags);
 912     }
 913     else if (keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP)
 914     {
 915         success = PageUp(1, flags);
 916     }
 917     else if (keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
 918     {
 919         success = PageDown(1, flags);
 920     }
 921     else if (keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME)
 922     {
 923         if (flags & wxRICHTEXT_CTRL_DOWN)
 924             success = MoveHome(flags);
 925         else
 926             success = MoveToLineStart(flags);
 927     }
 928     else if (keyCode == WXK_END || keyCode == WXK_NUMPAD_END)
 929     {
 930         if (flags & wxRICHTEXT_CTRL_DOWN)
 931             success = MoveEnd(flags);
 932         else
 933             success = MoveToLineEnd(flags);
 934     }
 935
 936     if (success)
 937     {
 938         ScrollIntoView(m_caretPosition, keyCode);
 939         SetDefaultStyleToCursorStyle();
 940     }
 941
 942     return success;
 943 }
 944
 945 /// Extend the selection. Selections are in caret positions.
 946 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
 947 {
 948     if (flags & wxRICHTEXT_SHIFT_DOWN)
 949     {
 950         // If not currently selecting, start selecting
 951         if (m_selectionRange.GetStart() == -2)
 952         {
 953             m_selectionAnchor = oldPos;
 954
 955             if (oldPos > newPos)
 956                 m_selectionRange.SetRange(newPos+1, oldPos);
 957             else
 958                 m_selectionRange.SetRange(oldPos+1, newPos);
 959         }
 960         else
 961         {
 962             // Always ensure that the selection range start is greater than
 963             // the end.
 964             if (newPos > m_selectionAnchor)
 965                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
 966             else
 967                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
 968         }
 969
 970         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
 971         {
 972             wxLogDebug(wxT("Strange selection range"));
 973         }
 974
 975         return true;
 976     }
 977     else
 978         return false;
 979 }
 980
 981 /// Scroll into view, returning true if we scrolled.
 982 /// This takes a _caret_ position.
 983 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
 984 {
 985     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
 986
 987     if (!line)
 988         return false;
 989
 990     int ppuX, ppuY;
 991     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 992
 993     int startXUnits, startYUnits;
 994     GetViewStart(& startXUnits, & startYUnits);
 995     int startY = startYUnits * ppuY;
 996
 997     int sx = 0, sy = 0;
 998     GetVirtualSize(& sx, & sy);
 999     int sxUnits = 0;
1000     int syUnits = 0;
1001     if (ppuY != 0)
1002         syUnits = sy/ppuY;
1003
1004     wxRect rect = line->GetRect();
1005
1006     bool scrolled = false;
1007
1008     wxSize clientSize = GetClientSize();
1009
1010     // Going down
1011     if (keyCode == WXK_DOWN || keyCode == WXK_NUMPAD_DOWN ||
1012         keyCode == WXK_RIGHT || keyCode == WXK_NUMPAD_DOWN ||
1013         keyCode == WXK_END || keyCode == WXK_NUMPAD_END ||
1014         keyCode == WXK_PAGEDOWN || keyCode == WXK_NUMPAD_PAGEDOWN)
1015     {
1016         if ((rect.y + rect.height) > (clientSize.y + startY))
1017         {
1018             // Make it scroll so this item is at the bottom
1019             // of the window
1020             int y = rect.y - (clientSize.y - rect.height);
1021             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1022
1023             // If we're still off the screen, scroll another line down
1024             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1025                 yUnits ++;
1026
1027             if (startYUnits != yUnits)
1028             {
1029                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1030                 scrolled = true;
1031             }
1032         }
1033         else if (rect.y < startY)
1034         {
1035             // Make it scroll so this item is at the top
1036             // of the window
1037             int y = rect.y ;
1038             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1039
1040             if (startYUnits != yUnits)
1041             {
1042                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1043                 scrolled = true;
1044             }
1045         }
1046     }
1047     // Going up
1048     else if (keyCode == WXK_UP  || keyCode == WXK_NUMPAD_UP ||
1049              keyCode == WXK_LEFT || keyCode == WXK_NUMPAD_LEFT ||
1050              keyCode == WXK_HOME || keyCode == WXK_NUMPAD_HOME ||
1051              keyCode == WXK_PAGEUP || keyCode == WXK_NUMPAD_PAGEUP )
1052     {
1053         if (rect.y < startY)
1054         {
1055             // Make it scroll so this item is at the top
1056             // of the window
1057             int y = rect.y ;
1058             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1059
1060             if (startYUnits != yUnits)
1061             {
1062                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1063                 scrolled = true;
1064             }
1065         }
1066         else if ((rect.y + rect.height) > (clientSize.y + startY))
1067         {
1068             // Make it scroll so this item is at the bottom
1069             // of the window
1070             int y = rect.y - (clientSize.y - rect.height);
1071             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
1072
1073             // If we're still off the screen, scroll another line down
1074             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
1075                 yUnits ++;
1076
1077             if (startYUnits != yUnits)
1078             {
1079                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
1080                 scrolled = true;
1081             }
1082         }
1083     }
1084     PositionCaret();
1085
1086     return scrolled;
1087 }
1088
1089 /// Is the given position visible on the screen?
1090 bool wxRichTextCtrl::IsPositionVisible(long pos) const
1091 {
1092     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
1093
1094     if (!line)
1095         return false;
1096
1097     int ppuX, ppuY;
1098     GetScrollPixelsPerUnit(& ppuX, & ppuY);
1099
1100     int startX, startY;
1101     GetViewStart(& startX, & startY);
1102     startX = 0;
1103     startY = startY * ppuY;
1104
1105     int sx = 0, sy = 0;
1106     GetVirtualSize(& sx, & sy);
1107     sx = 0;
1108     if (ppuY != 0)
1109         sy = sy/ppuY;
1110
1111     wxRect rect = line->GetRect();
1112
1113     wxSize clientSize = GetClientSize();
1114
1115     return !(((rect.y + rect.height) > (clientSize.y + startY)) || rect.y < startY);
1116 }
1117
1118 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
1119 {
1120     m_caretPosition = position;
1121     m_caretAtLineStart = showAtLineStart;
1122 }
1123
1124 /// Move caret one visual step forward: this may mean setting a flag
1125 /// and keeping the same position if we're going from the end of one line
1126 /// to the start of the next, which may be the exact same caret position.
1127 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
1128 {
1129     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1130
1131     // Only do the check if we're not at the end of the paragraph (where things work OK
1132     // anyway)
1133     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
1134     {
1135         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1136
1137         if (line)
1138         {
1139             wxRichTextRange lineRange = line->GetAbsoluteRange();
1140
1141             // We're at the end of a line. See whether we need to
1142             // stay at the same actual caret position but change visual
1143             // position, or not.
1144             if (oldPosition == lineRange.GetEnd())
1145             {
1146                 if (m_caretAtLineStart)
1147                 {
1148                     // We're already at the start of the line, so actually move on now.
1149                     m_caretPosition = oldPosition + 1;
1150                     m_caretAtLineStart = false;
1151                 }
1152                 else
1153                 {
1154                     // We're showing at the end of the line, so keep to
1155                     // the same position but indicate that we're to show
1156                     // at the start of the next line.
1157                     m_caretPosition = oldPosition;
1158                     m_caretAtLineStart = true;
1159                 }
1160                 SetDefaultStyleToCursorStyle();
1161                 return;
1162             }
1163         }
1164     }
1165     m_caretPosition ++;
1166     SetDefaultStyleToCursorStyle();
1167 }
1168
1169 /// Move caret one visual step backward: this may mean setting a flag
1170 /// and keeping the same position if we're going from the end of one line
1171 /// to the start of the next, which may be the exact same caret position.
1172 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
1173 {
1174     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
1175
1176     // Only do the check if we're not at the start of the paragraph (where things work OK
1177     // anyway)
1178     if (para && (oldPosition != para->GetRange().GetStart()))
1179     {
1180         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
1181
1182         if (line)
1183         {
1184             wxRichTextRange lineRange = line->GetAbsoluteRange();
1185
1186             // We're at the start of a line. See whether we need to
1187             // stay at the same actual caret position but change visual
1188             // position, or not.
1189             if (oldPosition == lineRange.GetStart())
1190             {
1191                 m_caretPosition = oldPosition-1;
1192                 m_caretAtLineStart = true;
1193                 return;
1194             }
1195             else if (oldPosition == lineRange.GetEnd())
1196             {
1197                 if (m_caretAtLineStart)
1198                 {
1199                     // We're at the start of the line, so keep the same caret position
1200                     // but clear the start-of-line flag.
1201                     m_caretPosition = oldPosition;
1202                     m_caretAtLineStart = false;
1203                 }
1204                 else
1205                 {
1206                     // We're showing at the end of the line, so go back
1207                     // to the previous character position.
1208                     m_caretPosition = oldPosition - 1;
1209                 }
1210                 SetDefaultStyleToCursorStyle();
1211                 return;
1212             }
1213         }
1214     }
1215     m_caretPosition --;
1216     SetDefaultStyleToCursorStyle();
1217 }
1218
1219 /// Move right
1220 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
1221 {
1222     long endPos = GetBuffer().GetRange().GetEnd();
1223
1224     if (m_caretPosition + noPositions < endPos)
1225     {
1226         long oldPos = m_caretPosition;
1227         long newPos = m_caretPosition + noPositions;
1228
1229         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1230         if (!extendSel)
1231             SelectNone();
1232
1233         // Determine by looking at oldPos and m_caretPosition whether
1234         // we moved from the end of a line to the start of the next line, in which case
1235         // we want to adjust the caret position such that it is positioned at the
1236         // start of the next line, rather than jumping past the first character of the
1237         // line.
1238         if (noPositions == 1 && !extendSel)
1239             MoveCaretForward(oldPos);
1240         else
1241             SetCaretPosition(newPos);
1242
1243         PositionCaret();
1244         SetDefaultStyleToCursorStyle();
1245
1246         if (extendSel)
1247             Refresh(false);
1248         return true;
1249     }
1250     else
1251         return false;
1252 }
1253
1254 /// Move left
1255 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
1256 {
1257     long startPos = -1;
1258
1259     if (m_caretPosition > startPos - noPositions + 1)
1260     {
1261         long oldPos = m_caretPosition;
1262         long newPos = m_caretPosition - noPositions;
1263         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1264         if (!extendSel)
1265             SelectNone();
1266
1267         if (noPositions == 1 && !extendSel)
1268             MoveCaretBack(oldPos);
1269         else
1270             SetCaretPosition(newPos);
1271
1272         PositionCaret();
1273         SetDefaultStyleToCursorStyle();
1274
1275         if (extendSel)
1276             Refresh(false);
1277         return true;
1278     }
1279     else
1280         return false;
1281 }
1282
1283 /// Move up
1284 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
1285 {
1286     return MoveDown(- noLines, flags);
1287 }
1288
1289 /// Move up
1290 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
1291 {
1292     if (!GetCaret())
1293         return false;
1294
1295     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
1296     wxPoint pt = GetCaret()->GetPosition();
1297     long newLine = lineNumber + noLines;
1298
1299     if (lineNumber != -1)
1300     {
1301         if (noLines > 0)
1302         {
1303             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
1304
1305             if (newLine > lastLine)
1306                 return false;
1307         }
1308         else
1309         {
1310             if (newLine < 0)
1311                 return false;
1312         }
1313     }
1314
1315     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1316     if (lineObj)
1317     {
1318         pt.y = lineObj->GetAbsolutePosition().y + 2;
1319     }
1320     else
1321         return false;
1322
1323     long newPos = 0;
1324     wxClientDC dc(this);
1325     PrepareDC(dc);
1326     dc.SetFont(GetFont());
1327
1328     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1329
1330     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1331     {
1332         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1333         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1334         // so we view the caret at the start of the line.
1335         bool caretLineStart = false;
1336         if (hitTest & wxRICHTEXT_HITTEST_BEFORE)
1337         {
1338             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1339             wxRichTextRange lineRange;
1340             if (thisLine)
1341                 lineRange = thisLine->GetAbsoluteRange();
1342
1343             if (thisLine && (newPos-1) == lineRange.GetEnd())
1344             {
1345                 newPos --;
1346                 caretLineStart = true;
1347             }
1348             else
1349             {
1350                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1351                 if (para && para->GetRange().GetStart() == newPos)
1352                     newPos --;
1353             }
1354         }
1355
1356         long newSelEnd = newPos;
1357
1358         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1359         if (!extendSel)
1360             SelectNone();
1361
1362         SetCaretPosition(newPos, caretLineStart);
1363         PositionCaret();
1364         SetDefaultStyleToCursorStyle();
1365
1366         if (extendSel)
1367             Refresh(false);
1368         return true;
1369     }
1370
1371     return false;
1372 }
1373
1374 /// Move to the end of the paragraph
1375 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1376 {
1377     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1378     if (para)
1379     {
1380         long newPos = para->GetRange().GetEnd() - 1;
1381         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1382         if (!extendSel)
1383             SelectNone();
1384
1385         SetCaretPosition(newPos);
1386         PositionCaret();
1387         SetDefaultStyleToCursorStyle();
1388
1389         if (extendSel)
1390             Refresh(false);
1391         return true;
1392     }
1393
1394     return false;
1395 }
1396
1397 /// Move to the start of the paragraph
1398 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1399 {
1400     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1401     if (para)
1402     {
1403         long newPos = para->GetRange().GetStart() - 1;
1404         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1405         if (!extendSel)
1406             SelectNone();
1407
1408         SetCaretPosition(newPos);
1409         PositionCaret();
1410         SetDefaultStyleToCursorStyle();
1411
1412         if (extendSel)
1413             Refresh(false);
1414         return true;
1415     }
1416
1417     return false;
1418 }
1419
1420 /// Move to the end of the line
1421 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1422 {
1423     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1424
1425     if (line)
1426     {
1427         wxRichTextRange lineRange = line->GetAbsoluteRange();
1428         long newPos = lineRange.GetEnd();
1429         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1430         if (!extendSel)
1431             SelectNone();
1432
1433         SetCaretPosition(newPos);
1434         PositionCaret();
1435         SetDefaultStyleToCursorStyle();
1436
1437         if (extendSel)
1438             Refresh(false);
1439         return true;
1440     }
1441
1442     return false;
1443 }
1444
1445 /// Move to the start of the line
1446 bool wxRichTextCtrl::MoveToLineStart(int flags)
1447 {
1448     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1449     if (line)
1450     {
1451         wxRichTextRange lineRange = line->GetAbsoluteRange();
1452         long newPos = lineRange.GetStart()-1;
1453
1454         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1455         if (!extendSel)
1456             SelectNone();
1457
1458         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1459
1460         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1461         PositionCaret();
1462         SetDefaultStyleToCursorStyle();
1463
1464         if (extendSel)
1465             Refresh(false);
1466         return true;
1467     }
1468
1469     return false;
1470 }
1471
1472 /// Move to the start of the buffer
1473 bool wxRichTextCtrl::MoveHome(int flags)
1474 {
1475     if (m_caretPosition != -1)
1476     {
1477         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1478         if (!extendSel)
1479             SelectNone();
1480
1481         SetCaretPosition(-1);
1482         PositionCaret();
1483         SetDefaultStyleToCursorStyle();
1484
1485         if (extendSel)
1486             Refresh(false);
1487         return true;
1488     }
1489     else
1490         return false;
1491 }
1492
1493 /// Move to the end of the buffer
1494 bool wxRichTextCtrl::MoveEnd(int flags)
1495 {
1496     long endPos = GetBuffer().GetRange().GetEnd()-1;
1497
1498     if (m_caretPosition != endPos)
1499     {
1500         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1501         if (!extendSel)
1502             SelectNone();
1503
1504         SetCaretPosition(endPos);
1505         PositionCaret();
1506         SetDefaultStyleToCursorStyle();
1507
1508         if (extendSel)
1509             Refresh(false);
1510         return true;
1511     }
1512     else
1513         return false;
1514 }
1515
1516 /// Move noPages pages up
1517 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1518 {
1519     return PageDown(- noPages, flags);
1520 }
1521
1522 /// Move noPages pages down
1523 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1524 {
1525     // Calculate which line occurs noPages * screen height further down.
1526     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1527     if (line)
1528     {
1529         wxSize clientSize = GetClientSize();
1530         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1531
1532         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1533         if (newLine)
1534         {
1535             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1536             long pos = lineRange.GetStart()-1;
1537             if (pos != m_caretPosition)
1538             {
1539                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1540
1541                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1542                 if (!extendSel)
1543                     SelectNone();
1544
1545                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1546                 PositionCaret();
1547                 SetDefaultStyleToCursorStyle();
1548
1549                 if (extendSel)
1550                     Refresh(false);
1551                 return true;
1552             }
1553         }
1554     }
1555
1556     return false;
1557 }
1558
1559 static bool wxRichTextCtrlIsWhitespace(const wxString& str)
1560 {
1561     return str == wxT(" ") || str == wxT("\t");
1562 }
1563
1564 // Finds the caret position for the next word
1565 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1566 {
1567     long endPos = GetBuffer().GetRange().GetEnd();
1568
1569     if (direction > 0)
1570     {
1571         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1572
1573         // First skip current text to space
1574         while (i < endPos && i > -1)
1575         {
1576             // i is in character, not caret positions
1577             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1578             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1579             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1580             {
1581                 break;
1582             }
1583             else if (!wxRichTextCtrlIsWhitespace(text) && !text.empty())
1584                 i += direction;
1585             else
1586             {
1587                 break;
1588             }
1589         }
1590         while (i < endPos && i > -1)
1591         {
1592             // i is in character, not caret positions
1593             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1594             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1595             if (line && (i == line->GetAbsoluteRange().GetEnd()))
1596                 return wxMax(-1, i);
1597
1598             if (text.empty()) // End of paragraph, or maybe an image
1599                 return wxMax(-1, i - 1);
1600             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1601                 i += direction;
1602             else
1603             {
1604                 // Convert to caret position
1605                 return wxMax(-1, i - 1);
1606             }
1607         }
1608         if (i >= endPos)
1609             return endPos-1;
1610         return i-1;
1611     }
1612     else
1613     {
1614         long i = m_caretPosition;
1615
1616         // First skip white space
1617         while (i < endPos && i > -1)
1618         {
1619             // i is in character, not caret positions
1620             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1621             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1622
1623             if (text.empty() || (line && (i == line->GetAbsoluteRange().GetStart()))) // End of paragraph, or maybe an image
1624                 break;
1625             else if (wxRichTextCtrlIsWhitespace(text) || text.empty())
1626                 i += direction;
1627             else
1628                 break;
1629         }
1630         // Next skip current text to space
1631         while (i < endPos && i > -1)
1632         {
1633             // i is in character, not caret positions
1634             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1635             wxRichTextLine* line = GetBuffer().GetLineAtPosition(i, false);
1636             if (line && line->GetAbsoluteRange().GetStart() == i)
1637                 return i-1;
1638
1639             if (!wxRichTextCtrlIsWhitespace(text) /* && !text.empty() */)
1640                 i += direction;
1641             else
1642             {
1643                 return i;
1644             }
1645         }
1646         if (i < -1)
1647             return -1;
1648         return i;
1649     }
1650 }
1651
1652 /// Move n words left
1653 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1654 {
1655     long pos = FindNextWordPosition(-1);
1656     if (pos != m_caretPosition)
1657     {
1658         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1659
1660         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1661         if (!extendSel)
1662             SelectNone();
1663
1664         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1665         PositionCaret();
1666         SetDefaultStyleToCursorStyle();
1667
1668         if (extendSel)
1669             Refresh(false);
1670         return true;
1671     }
1672
1673     return false;
1674 }
1675
1676 /// Move n words right
1677 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1678 {
1679     long pos = FindNextWordPosition(1);
1680     if (pos != m_caretPosition)
1681     {
1682         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1683
1684         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1685         if (!extendSel)
1686             SelectNone();
1687
1688         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1689         PositionCaret();
1690         SetDefaultStyleToCursorStyle();
1691
1692         if (extendSel)
1693             Refresh(false);
1694         return true;
1695     }
1696
1697     return false;
1698 }
1699
1700 /// Sizing
1701 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1702 {
1703     // Only do sizing optimization for large buffers
1704     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1705     {
1706         m_fullLayoutRequired = true;
1707         m_fullLayoutTime = wxGetLocalTimeMillis();
1708         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1709         LayoutContent(true /* onlyVisibleRect */);
1710     }
1711     else
1712         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1713
1714 #if wxRICHTEXT_BUFFERED_PAINTING
1715     RecreateBuffer();
1716 #endif
1717
1718     event.Skip();
1719 }
1720
1721
1722 /// Idle-time processing
1723 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1724 {
1725     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1726
1727     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1728     {
1729         m_fullLayoutRequired = false;
1730         m_fullLayoutTime = 0;
1731         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1732         ShowPosition(m_fullLayoutSavedPosition);
1733         Refresh(false);
1734     }
1735
1736     if (m_caretPositionForDefaultStyle != -2)
1737     {
1738         // If the caret position has changed, no longer reflect the default style
1739         // in the UI.
1740         if (GetCaretPosition() != m_caretPositionForDefaultStyle)
1741             m_caretPositionForDefaultStyle = -2;
1742     }
1743
1744     event.Skip();
1745 }
1746
1747 /// Scrolling
1748 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1749 {
1750     // Not used
1751     event.Skip();
1752 }
1753
1754 /// Set up scrollbars, e.g. after a resize
1755 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1756 {
1757     if (m_freezeCount)
1758         return;
1759
1760     if (GetBuffer().IsEmpty())
1761     {
1762         SetScrollbars(0, 0, 0, 0, 0, 0);
1763         return;
1764     }
1765
1766     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1767     // of pixels. See e.g. wxVScrolledWindow for ideas.
1768     int pixelsPerUnit = 5;
1769     wxSize clientSize = GetClientSize();
1770
1771     int maxHeight = GetBuffer().GetCachedSize().y;
1772
1773     // Round up so we have at least maxHeight pixels
1774     int unitsY = (int) (((float)maxHeight/(float)pixelsPerUnit) + 0.5);
1775
1776     int startX = 0, startY = 0;
1777     if (!atTop)
1778         GetViewStart(& startX, & startY);
1779
1780     int maxPositionX = 0; // wxMax(sz.x - clientSize.x, 0);
1781     int maxPositionY = (int) ((((float)(wxMax((unitsY*pixelsPerUnit) - clientSize.y, 0)))/((float)pixelsPerUnit)) + 0.5);
1782
1783     // Move to previous scroll position if
1784     // possible
1785     SetScrollbars(0, pixelsPerUnit,
1786         0, unitsY,
1787         wxMin(maxPositionX, startX), wxMin(maxPositionY, startY));
1788 }
1789
1790 /// Paint the background
1791 void wxRichTextCtrl::PaintBackground(wxDC& dc)
1792 {
1793     wxColour backgroundColour = GetBackgroundColour();
1794     if (!backgroundColour.Ok())
1795         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
1796
1797     // Clear the background
1798     dc.SetBrush(wxBrush(backgroundColour));
1799     dc.SetPen(*wxTRANSPARENT_PEN);
1800     wxRect windowRect(GetClientSize());
1801     windowRect.x -= 2; windowRect.y -= 2;
1802     windowRect.width += 4; windowRect.height += 4;
1803
1804     // We need to shift the rectangle to take into account
1805     // scrolling. Converting device to logical coordinates.
1806     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
1807     dc.DrawRectangle(windowRect);
1808 }
1809
1810 #if wxRICHTEXT_BUFFERED_PAINTING
1811 /// Recreate buffer bitmap if necessary
1812 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
1813 {
1814     wxSize sz = size;
1815     if (sz == wxDefaultSize)
1816         sz = GetClientSize();
1817
1818     if (sz.x < 1 || sz.y < 1)
1819         return false;
1820
1821     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
1822         m_bufferBitmap = wxBitmap(sz.x, sz.y);
1823     return m_bufferBitmap.Ok();
1824 }
1825 #endif
1826
1827 // ----------------------------------------------------------------------------
1828 // file IO functions
1829 // ----------------------------------------------------------------------------
1830
1831 bool wxRichTextCtrl::DoLoadFile(const wxString& filename, int fileType)
1832 {
1833     bool success = GetBuffer().LoadFile(filename, fileType);
1834     if (success)
1835         m_filename = filename;
1836
1837     DiscardEdits();
1838     SetInsertionPoint(0);
1839     LayoutContent();
1840     PositionCaret();
1841     SetupScrollbars(true);
1842     Refresh(false);
1843     SendTextUpdatedEvent();
1844
1845     if (success)
1846         return true;
1847     else
1848     {
1849         wxLogError(_("File couldn't be loaded."));
1850
1851         return false;
1852     }
1853 }
1854
1855 bool wxRichTextCtrl::DoSaveFile(const wxString& filename, int fileType)
1856 {
1857     if (GetBuffer().SaveFile(filename, fileType))
1858     {
1859         m_filename = filename;
1860
1861         DiscardEdits();
1862
1863         return true;
1864     }
1865
1866     wxLogError(_("The text couldn't be saved."));
1867
1868     return false;
1869 }
1870
1871 // ----------------------------------------------------------------------------
1872 // wxRichTextCtrl specific functionality
1873 // ----------------------------------------------------------------------------
1874
1875 /// Add a new paragraph of text to the end of the buffer
1876 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
1877 {
1878     return GetBuffer().AddParagraph(text);
1879 }
1880
1881 /// Add an image
1882 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
1883 {
1884     return GetBuffer().AddImage(image);
1885 }
1886
1887 // ----------------------------------------------------------------------------
1888 // selection and ranges
1889 // ----------------------------------------------------------------------------
1890
1891 void wxRichTextCtrl::SelectAll()
1892 {
1893     SetSelection(0, GetLastPosition()+1);
1894     m_selectionAnchor = -1;
1895 }
1896
1897 /// Select none
1898 void wxRichTextCtrl::SelectNone()
1899 {
1900     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
1901         SetSelection(-2, -2);
1902     m_selectionAnchor = -2;
1903 }
1904
1905 static bool wxIsWordDelimiter(const wxString& text)
1906 {
1907     return !text.IsEmpty() && !wxIsalnum(text[0]);
1908 }
1909
1910 /// Select the word at the given character position
1911 bool wxRichTextCtrl::SelectWord(long position)
1912 {
1913     if (position < 0 || position > GetBuffer().GetRange().GetEnd())
1914         return false;
1915
1916     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
1917     if (!para)
1918         return false;
1919
1920     long positionStart = position;
1921     long positionEnd = position;
1922
1923     for (positionStart = position; positionStart >= para->GetRange().GetStart(); positionStart --)
1924     {
1925         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionStart, positionStart));
1926         if (wxIsWordDelimiter(text))
1927         {
1928             positionStart ++;
1929             break;
1930         }
1931     }
1932     if (positionStart < para->GetRange().GetStart())
1933         positionStart = para->GetRange().GetStart();
1934
1935     for (positionEnd = position; positionEnd < para->GetRange().GetEnd(); positionEnd ++)
1936     {
1937         wxString text = GetBuffer().GetTextForRange(wxRichTextRange(positionEnd, positionEnd));
1938         if (wxIsWordDelimiter(text))
1939         {
1940             positionEnd --;
1941             break;
1942         }
1943     }
1944     if (positionEnd >= para->GetRange().GetEnd())
1945         positionEnd = para->GetRange().GetEnd();
1946
1947     SetSelection(positionStart, positionEnd+1);
1948
1949     if (positionStart >= 0)
1950     {
1951         MoveCaret(positionStart-1, true);
1952         SetDefaultStyleToCursorStyle();
1953     }
1954
1955     return true;
1956 }
1957
1958 wxString wxRichTextCtrl::GetStringSelection() const
1959 {
1960     long from, to;
1961     GetSelection(&from, &to);
1962
1963     return GetRange(from, to);
1964 }
1965
1966 // ----------------------------------------------------------------------------
1967 // hit testing
1968 // ----------------------------------------------------------------------------
1969
1970 wxTextCtrlHitTestResult
1971 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
1972 {
1973     // implement in terms of the other overload as the native ports typically
1974     // can get the position and not (x, y) pair directly (although wxUniv
1975     // directly gets x and y -- and so overrides this method as well)
1976     long pos;
1977     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
1978
1979     if ( rc != wxTE_HT_UNKNOWN )
1980     {
1981         PositionToXY(pos, x, y);
1982     }
1983
1984     return rc;
1985 }
1986
1987 wxTextCtrlHitTestResult
1988 wxRichTextCtrl::HitTest(const wxPoint& pt,
1989                         long * pos) const
1990 {
1991     wxClientDC dc((wxRichTextCtrl*) this);
1992     ((wxRichTextCtrl*)this)->PrepareDC(dc);
1993
1994     // Buffer uses logical position (relative to start of buffer)
1995     // so convert
1996     wxPoint pt2 = GetLogicalPoint(pt);
1997
1998     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt2, *pos);
1999
2000     if ((hit & wxRICHTEXT_HITTEST_BEFORE) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2001         return wxTE_HT_BEFORE;
2002     else if ((hit & wxRICHTEXT_HITTEST_AFTER) && (hit & wxRICHTEXT_HITTEST_OUTSIDE))
2003         return wxTE_HT_BEYOND;
2004     else if (hit & wxRICHTEXT_HITTEST_BEFORE|wxRICHTEXT_HITTEST_AFTER)
2005         return wxTE_HT_ON_TEXT;
2006
2007     return wxTE_HT_UNKNOWN;
2008 }
2009
2010 // ----------------------------------------------------------------------------
2011 // set/get the controls text
2012 // ----------------------------------------------------------------------------
2013
2014 wxString wxRichTextCtrl::GetValue() const
2015 {
2016     return GetBuffer().GetText();
2017 }
2018
2019 wxString wxRichTextCtrl::GetRange(long from, long to) const
2020 {
2021     // Public API for range is different from internals
2022     return GetBuffer().GetTextForRange(wxRichTextRange(from, to-1));
2023 }
2024
2025 void wxRichTextCtrl::DoSetValue(const wxString& value, int flags)
2026 {
2027     Clear();
2028
2029     // if the text is long enough, it's faster to just set it instead of first
2030     // comparing it with the old one (chances are that it will be different
2031     // anyhow, this comparison is there to avoid flicker for small single-line
2032     // edit controls mostly)
2033     if ( (value.length() > 0x400) || (value != GetValue()) )
2034     {
2035         DoWriteText(value);
2036
2037         // for compatibility, don't move the cursor when doing SetValue()
2038         SetInsertionPoint(0);
2039     }
2040     else // same text
2041     {
2042         if ( flags & SetValue_SendEvent )
2043         {
2044             // still send an event for consistency
2045             SendTextUpdatedEvent();
2046         }
2047     }
2048
2049     // we should reset the modified flag even if the value didn't really change
2050
2051     // mark the control as being not dirty - we changed its text, not the
2052     // user
2053     DiscardEdits();
2054 }
2055
2056 void wxRichTextCtrl::WriteText(const wxString& value)
2057 {
2058     DoWriteText(value);
2059 }
2060
2061 void wxRichTextCtrl::DoWriteText(const wxString& value, int flags)
2062 {
2063     wxString valueUnix = wxTextFile::Translate(value, wxTextFileType_Unix);
2064
2065     GetBuffer().InsertTextWithUndo(m_caretPosition+1, valueUnix, this, wxRICHTEXT_INSERT_WITH_PREVIOUS_PARAGRAPH_STYLE);
2066
2067     if ( flags & SetValue_SendEvent )
2068         SendTextUpdatedEvent();
2069 }
2070
2071 void wxRichTextCtrl::AppendText(const wxString& text)
2072 {
2073     SetInsertionPointEnd();
2074
2075     WriteText(text);
2076 }
2077
2078 /// Write an image at the current insertion point
2079 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
2080 {
2081     wxRichTextImageBlock imageBlock;
2082
2083     wxImage image2 = image;
2084     if (imageBlock.MakeImageBlock(image2, bitmapType))
2085         return WriteImage(imageBlock);
2086
2087     return false;
2088 }
2089
2090 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
2091 {
2092     wxRichTextImageBlock imageBlock;
2093
2094     wxImage image;
2095     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
2096         return WriteImage(imageBlock);
2097
2098     return false;
2099 }
2100
2101 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
2102 {
2103     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
2104 }
2105
2106 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
2107 {
2108     if (bitmap.Ok())
2109     {
2110         wxRichTextImageBlock imageBlock;
2111
2112         wxImage image = bitmap.ConvertToImage();
2113         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
2114             return WriteImage(imageBlock);
2115     }
2116
2117     return false;
2118 }
2119
2120 /// Insert a newline (actually paragraph) at the current insertion point.
2121 bool wxRichTextCtrl::Newline()
2122 {
2123     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
2124 }
2125
2126 /// Insert a line break at the current insertion point.
2127 bool wxRichTextCtrl::LineBreak()
2128 {
2129     wxString text;
2130     text = wxRichTextLineBreakChar;
2131     return GetBuffer().InsertTextWithUndo(m_caretPosition+1, text, this);
2132 }
2133
2134 // ----------------------------------------------------------------------------
2135 // Clipboard operations
2136 // ----------------------------------------------------------------------------
2137
2138 void wxRichTextCtrl::Copy()
2139 {
2140     if (CanCopy())
2141     {
2142         wxRichTextRange range = GetInternalSelectionRange();
2143         GetBuffer().CopyToClipboard(range);
2144     }
2145 }
2146
2147 void wxRichTextCtrl::Cut()
2148 {
2149     if (CanCut())
2150     {
2151         wxRichTextRange range = GetInternalSelectionRange();
2152         GetBuffer().CopyToClipboard(range);
2153
2154         DeleteSelectedContent();
2155         LayoutContent();
2156         Refresh(false);
2157     }
2158 }
2159
2160 void wxRichTextCtrl::Paste()
2161 {
2162     if (CanPaste())
2163     {
2164         BeginBatchUndo(_("Paste"));
2165
2166         long newPos = m_caretPosition;
2167         DeleteSelectedContent(& newPos);
2168
2169         GetBuffer().PasteFromClipboard(newPos);
2170
2171         EndBatchUndo();
2172     }
2173 }
2174
2175 void wxRichTextCtrl::DeleteSelection()
2176 {
2177     if (CanDeleteSelection())
2178     {
2179         DeleteSelectedContent();
2180     }
2181 }
2182
2183 bool wxRichTextCtrl::HasSelection() const
2184 {
2185     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
2186 }
2187
2188 bool wxRichTextCtrl::CanCopy() const
2189 {
2190     // Can copy if there's a selection
2191     return HasSelection();
2192 }
2193
2194 bool wxRichTextCtrl::CanCut() const
2195 {
2196     return HasSelection() && IsEditable();
2197 }
2198
2199 bool wxRichTextCtrl::CanPaste() const
2200 {
2201     if ( !IsEditable() )
2202         return false;
2203
2204     return GetBuffer().CanPasteFromClipboard();
2205 }
2206
2207 bool wxRichTextCtrl::CanDeleteSelection() const
2208 {
2209     return HasSelection() && IsEditable();
2210 }
2211
2212
2213 // ----------------------------------------------------------------------------
2214 // Accessors
2215 // ----------------------------------------------------------------------------
2216
2217 void wxRichTextCtrl::SetEditable(bool editable)
2218 {
2219     m_editable = editable;
2220 }
2221
2222 void wxRichTextCtrl::SetInsertionPoint(long pos)
2223 {
2224     SelectNone();
2225
2226     m_caretPosition = pos - 1;
2227 }
2228
2229 void wxRichTextCtrl::SetInsertionPointEnd()
2230 {
2231     long pos = GetLastPosition();
2232     SetInsertionPoint(pos);
2233 }
2234
2235 long wxRichTextCtrl::GetInsertionPoint() const
2236 {
2237     return m_caretPosition+1;
2238 }
2239
2240 wxTextPos wxRichTextCtrl::GetLastPosition() const
2241 {
2242     return GetBuffer().GetRange().GetEnd();
2243 }
2244
2245 // If the return values from and to are the same, there is no
2246 // selection.
2247 void wxRichTextCtrl::GetSelection(long* from, long* to) const
2248 {
2249     *from = m_selectionRange.GetStart();
2250     *to = m_selectionRange.GetEnd();
2251     if ((*to) != -1 && (*to) != -2)
2252         (*to) ++;
2253 }
2254
2255 bool wxRichTextCtrl::IsEditable() const
2256 {
2257     return m_editable;
2258 }
2259
2260 // ----------------------------------------------------------------------------
2261 // selection
2262 // ----------------------------------------------------------------------------
2263
2264 void wxRichTextCtrl::SetSelection(long from, long to)
2265 {
2266     // if from and to are both -1, it means (in wxWidgets) that all text should
2267     // be selected.
2268     if ( (from == -1) && (to == -1) )
2269     {
2270         from = 0;
2271         to = GetLastPosition()+1;
2272     }
2273
2274     DoSetSelection(from, to);
2275 }
2276
2277 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
2278 {
2279     m_selectionAnchor = from;
2280     m_selectionRange.SetRange(from, to-1);
2281     if (from > -2)
2282         m_caretPosition = from-1;
2283
2284     Refresh(false);
2285     PositionCaret();
2286 }
2287
2288 // ----------------------------------------------------------------------------
2289 // Editing
2290 // ----------------------------------------------------------------------------
2291
2292 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to),
2293                              const wxString& value)
2294 {
2295     BeginBatchUndo(_("Replace"));
2296
2297     DeleteSelectedContent();
2298
2299     DoWriteText(value, SetValue_SelectionOnly);
2300
2301     EndBatchUndo();
2302 }
2303
2304 void wxRichTextCtrl::Remove(long from, long to)
2305 {
2306     SelectNone();
2307
2308     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to), this);
2309
2310     LayoutContent();
2311     if (!IsFrozen())
2312         Refresh(false);
2313 }
2314
2315 bool wxRichTextCtrl::IsModified() const
2316 {
2317     return m_buffer.IsModified();
2318 }
2319
2320 void wxRichTextCtrl::MarkDirty()
2321 {
2322     m_buffer.Modify(true);
2323 }
2324
2325 void wxRichTextCtrl::DiscardEdits()
2326 {
2327     m_caretPositionForDefaultStyle = -2;
2328     m_buffer.Modify(false);
2329     m_buffer.GetCommandProcessor()->ClearCommands();
2330 }
2331
2332 int wxRichTextCtrl::GetNumberOfLines() const
2333 {
2334     return GetBuffer().GetParagraphCount();
2335 }
2336
2337 // ----------------------------------------------------------------------------
2338 // Positions <-> coords
2339 // ----------------------------------------------------------------------------
2340
2341 long wxRichTextCtrl::XYToPosition(long x, long y) const
2342 {
2343     return GetBuffer().XYToPosition(x, y);
2344 }
2345
2346 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2347 {
2348     return GetBuffer().PositionToXY(pos, x, y);
2349 }
2350
2351 // ----------------------------------------------------------------------------
2352 //
2353 // ----------------------------------------------------------------------------
2354
2355 void wxRichTextCtrl::ShowPosition(long pos)
2356 {
2357     if (!IsPositionVisible(pos))
2358         ScrollIntoView(pos-1, WXK_DOWN);
2359 }
2360
2361 int wxRichTextCtrl::GetLineLength(long lineNo) const
2362 {
2363     return GetBuffer().GetParagraphLength(lineNo);
2364 }
2365
2366 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2367 {
2368     return GetBuffer().GetParagraphText(lineNo);
2369 }
2370
2371 // ----------------------------------------------------------------------------
2372 // Undo/redo
2373 // ----------------------------------------------------------------------------
2374
2375 void wxRichTextCtrl::Undo()
2376 {
2377     if (CanUndo())
2378     {
2379         GetCommandProcessor()->Undo();
2380     }
2381 }
2382
2383 void wxRichTextCtrl::Redo()
2384 {
2385     if (CanRedo())
2386     {
2387         GetCommandProcessor()->Redo();
2388     }
2389 }
2390
2391 bool wxRichTextCtrl::CanUndo() const
2392 {
2393     return GetCommandProcessor()->CanUndo();
2394 }
2395
2396 bool wxRichTextCtrl::CanRedo() const
2397 {
2398     return GetCommandProcessor()->CanRedo();
2399 }
2400
2401 // ----------------------------------------------------------------------------
2402 // implementation details
2403 // ----------------------------------------------------------------------------
2404
2405 void wxRichTextCtrl::Command(wxCommandEvent& event)
2406 {
2407     SetValue(event.GetString());
2408     GetEventHandler()->ProcessEvent(event);
2409 }
2410
2411 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2412 {
2413     // By default, load the first file into the text window.
2414     if (event.GetNumberOfFiles() > 0)
2415     {
2416         LoadFile(event.GetFiles()[0]);
2417     }
2418 }
2419
2420 wxSize wxRichTextCtrl::DoGetBestSize() const
2421 {
2422     return wxSize(10, 10);
2423 }
2424
2425 // ----------------------------------------------------------------------------
2426 // standard handlers for standard edit menu events
2427 // ----------------------------------------------------------------------------
2428
2429 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2430 {
2431     Cut();
2432 }
2433
2434 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2435 {
2436     DeleteSelection();
2437 }
2438
2439 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2440 {
2441     Copy();
2442 }
2443
2444 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2445 {
2446     Paste();
2447 }
2448
2449 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2450 {
2451     Undo();
2452 }
2453
2454 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2455 {
2456     Redo();
2457 }
2458
2459 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2460 {
2461     event.Enable( CanCut() );
2462 }
2463
2464 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2465 {
2466     event.Enable( CanCopy() );
2467 }
2468
2469 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2470 {
2471     event.Enable( CanDeleteSelection() );
2472 }
2473
2474 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2475 {
2476     event.Enable( CanPaste() );
2477 }
2478
2479 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2480 {
2481     event.Enable( CanUndo() );
2482     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2483 }
2484
2485 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2486 {
2487     event.Enable( CanRedo() );
2488     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2489 }
2490
2491 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2492 {
2493     SelectAll();
2494 }
2495
2496 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2497 {
2498     event.Enable(GetLastPosition() > 0);
2499 }
2500
2501 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& WXUNUSED(event))
2502 {
2503     if (!m_contextMenu)
2504     {
2505         m_contextMenu = new wxMenu;
2506         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2507         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2508         m_contextMenu->AppendSeparator();
2509         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2510         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2511         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2512         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2513         m_contextMenu->AppendSeparator();
2514         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2515     }
2516     PopupMenu(m_contextMenu);
2517     return;
2518 }
2519
2520 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttrEx& style)
2521 {
2522     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), style);
2523 }
2524
2525 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2526 {
2527     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), wxTextAttrEx(style));
2528 }
2529
2530 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxRichTextAttr& style)
2531 {
2532     return GetBuffer().SetStyle(range.ToInternal(), style);
2533 }
2534
2535 // extended style setting operation with flags including:
2536 // wxRICHTEXT_SETSTYLE_WITH_UNDO, wxRICHTEXT_SETSTYLE_OPTIMIZE, wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY.
2537 // see richtextbuffer.h for more details.
2538 bool wxRichTextCtrl::SetStyleEx(long start, long end, const wxTextAttrEx& style, int flags)
2539 {
2540     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), style, flags);
2541 }
2542
2543 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxTextAttrEx& style, int flags)
2544 {
2545     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2546 }
2547
2548 bool wxRichTextCtrl::SetStyleEx(const wxRichTextRange& range, const wxRichTextAttr& style, int flags)
2549 {
2550     return GetBuffer().SetStyle(range.ToInternal(), style, flags);
2551 }
2552
2553 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttrEx& style)
2554 {
2555     return GetBuffer().SetDefaultStyle(style);
2556 }
2557
2558 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2559 {
2560     return GetBuffer().SetDefaultStyle(wxTextAttrEx(style));
2561 }
2562
2563 const wxTextAttrEx& wxRichTextCtrl::GetDefaultStyleEx() const
2564 {
2565     return GetBuffer().GetDefaultStyle();
2566 }
2567
2568 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2569 {
2570     return GetBuffer().GetDefaultStyle();
2571 }
2572
2573 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style)
2574 {
2575     wxTextAttrEx attr(style);
2576     if (GetBuffer().GetStyle(position, attr))
2577     {
2578         style = attr;
2579         return true;
2580     }
2581     else
2582         return false;
2583 }
2584
2585 bool wxRichTextCtrl::GetStyle(long position, wxTextAttrEx& style)
2586 {
2587     return GetBuffer().GetStyle(position, style);
2588 }
2589
2590 bool wxRichTextCtrl::GetStyle(long position, wxRichTextAttr& style)
2591 {
2592     return GetBuffer().GetStyle(position, style);
2593 }
2594
2595 // get the common set of styles for the range
2596 bool wxRichTextCtrl::GetStyleForRange(const wxRichTextRange& range, wxRichTextAttr& style)
2597 {
2598     wxTextAttrEx styleEx;
2599     if (GetBuffer().GetStyleForRange(range.ToInternal(), styleEx))
2600     {
2601         style = styleEx;
2602         return true;
2603     }
2604     else
2605         return false;
2606 }
2607
2608 bool wxRichTextCtrl::GetStyleForRange(const wxRichTextRange& range, wxTextAttrEx& style)
2609 {
2610     return GetBuffer().GetStyleForRange(range.ToInternal(), style);
2611 }
2612
2613 /// Get the content (uncombined) attributes for this position.
2614
2615 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttr& style)
2616 {
2617     wxTextAttrEx attr(style);
2618     if (GetBuffer().GetUncombinedStyle(position, attr))
2619     {
2620         style = attr;
2621         return true;
2622     }
2623     else
2624         return false;
2625 }
2626
2627 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxTextAttrEx& style)
2628 {
2629     return GetBuffer().GetUncombinedStyle(position, style);
2630 }
2631
2632 bool wxRichTextCtrl::GetUncombinedStyle(long position, wxRichTextAttr& style)
2633 {
2634     return GetBuffer().GetUncombinedStyle(position, style);
2635 }
2636
2637 /// Set font, and also the buffer attributes
2638 bool wxRichTextCtrl::SetFont(const wxFont& font)
2639 {
2640     wxControl::SetFont(font);
2641
2642     wxTextAttrEx attr = GetBuffer().GetAttributes();
2643     attr.SetFont(font);
2644     GetBuffer().SetBasicStyle(attr);
2645
2646     GetBuffer().Invalidate(wxRICHTEXT_ALL);
2647     Refresh(false);
2648
2649     return true;
2650 }
2651
2652 /// Transform logical to physical
2653 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2654 {
2655     wxPoint pt;
2656     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2657
2658     return pt;
2659 }
2660
2661 /// Transform physical to logical
2662 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2663 {
2664     wxPoint pt;
2665     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2666
2667     return pt;
2668 }
2669
2670 /// Position the caret
2671 void wxRichTextCtrl::PositionCaret()
2672 {
2673     if (!GetCaret())
2674         return;
2675
2676     //wxLogDebug(wxT("PositionCaret"));
2677
2678     wxRect caretRect;
2679     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2680     {
2681         wxPoint originalPt = caretRect.GetPosition();
2682         wxPoint pt = GetPhysicalPoint(originalPt);
2683         if (GetCaret()->GetPosition() != pt)
2684         {
2685             GetCaret()->Move(pt);
2686             GetCaret()->SetSize(caretRect.GetSize());
2687         }
2688     }
2689 }
2690
2691 /// Get the caret height and position for the given character position
2692 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2693 {
2694     wxClientDC dc(this);
2695     dc.SetFont(GetFont());
2696
2697     PrepareDC(dc);
2698
2699     wxPoint pt;
2700     int height = 0;
2701
2702     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2703     {
2704         // Caret height can't be zero
2705         if (height == 0)
2706             height = dc.GetCharHeight();
2707
2708         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2709         return true;
2710     }
2711
2712     return false;
2713 }
2714
2715 /// Gets the line for the visible caret position. If the caret is
2716 /// shown at the very end of the line, it means the next character is actually
2717 /// on the following line. So let's get the line we're expecting to find
2718 /// if this is the case.
2719 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2720 {
2721     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2722     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2723     if (line)
2724     {
2725         wxRichTextRange lineRange = line->GetAbsoluteRange();
2726         if (caretPosition == lineRange.GetStart()-1 &&
2727             (para->GetRange().GetStart() != lineRange.GetStart()))
2728         {
2729             if (!m_caretAtLineStart)
2730                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2731         }
2732     }
2733     return line;
2734 }
2735
2736
2737 /// Move the caret to the given character position
2738 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2739 {
2740     if (GetBuffer().GetDirty())
2741         LayoutContent();
2742
2743     if (pos <= GetBuffer().GetRange().GetEnd())
2744     {
2745         SetCaretPosition(pos, showAtLineStart);
2746
2747         PositionCaret();
2748
2749         return true;
2750     }
2751     else
2752         return false;
2753 }
2754
2755 /// Layout the buffer: which we must do before certain operations, such as
2756 /// setting the caret position.
2757 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2758 {
2759     if (GetBuffer().GetDirty() || onlyVisibleRect)
2760     {
2761         wxRect availableSpace(GetClientSize());
2762         if (availableSpace.width == 0)
2763             availableSpace.width = 10;
2764         if (availableSpace.height == 0)
2765             availableSpace.height = 10;
2766
2767         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2768         if (onlyVisibleRect)
2769         {
2770             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2771             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2772         }
2773
2774         wxClientDC dc(this);
2775         dc.SetFont(GetFont());
2776
2777         PrepareDC(dc);
2778
2779         GetBuffer().Defragment();
2780         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2781         GetBuffer().Layout(dc, availableSpace, flags);
2782         GetBuffer().SetDirty(false);
2783
2784         if (!IsFrozen())
2785             SetupScrollbars();
2786     }
2787
2788     return true;
2789 }
2790
2791 /// Is all of the selection bold?
2792 bool wxRichTextCtrl::IsSelectionBold()
2793 {
2794     if (HasSelection())
2795     {
2796         wxRichTextAttr attr;
2797         wxRichTextRange range = GetSelectionRange();
2798         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2799         attr.SetFontWeight(wxBOLD);
2800
2801         return HasCharacterAttributes(range, attr);
2802     }
2803     else
2804     {
2805         // If no selection, then we need to combine current style with default style
2806         // to see what the effect would be if we started typing.
2807         wxRichTextAttr attr;
2808         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2809
2810         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2811         if (GetStyle(pos, attr))
2812         {
2813             if (IsDefaultStyleShowing())
2814                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2815             return attr.GetFontWeight() == wxBOLD;
2816         }
2817     }
2818     return false;
2819 }
2820
2821 /// Is all of the selection italics?
2822 bool wxRichTextCtrl::IsSelectionItalics()
2823 {
2824     if (HasSelection())
2825     {
2826         wxRichTextRange range = GetSelectionRange();
2827         wxRichTextAttr attr;
2828         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2829         attr.SetFontStyle(wxITALIC);
2830
2831         return HasCharacterAttributes(range, attr);
2832     }
2833     else
2834     {
2835         // If no selection, then we need to combine current style with default style
2836         // to see what the effect would be if we started typing.
2837         wxRichTextAttr attr;
2838         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2839
2840         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2841         if (GetStyle(pos, attr))
2842         {
2843             if (IsDefaultStyleShowing())
2844                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2845             return attr.GetFontStyle() == wxITALIC;
2846         }
2847     }
2848     return false;
2849 }
2850
2851 /// Is all of the selection underlined?
2852 bool wxRichTextCtrl::IsSelectionUnderlined()
2853 {
2854     if (HasSelection())
2855     {
2856         wxRichTextRange range = GetSelectionRange();
2857         wxRichTextAttr attr;
2858         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2859         attr.SetFontUnderlined(true);
2860
2861         return HasCharacterAttributes(range, attr);
2862     }
2863     else
2864     {
2865         // If no selection, then we need to combine current style with default style
2866         // to see what the effect would be if we started typing.
2867         wxRichTextAttr attr;
2868         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2869         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2870
2871         if (GetStyle(pos, attr))
2872         {
2873             if (IsDefaultStyleShowing())
2874                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2875             return attr.GetFontUnderlined();
2876         }
2877     }
2878     return false;
2879 }
2880
2881 /// Apply bold to the selection
2882 bool wxRichTextCtrl::ApplyBoldToSelection()
2883 {
2884     wxRichTextAttr attr;
2885     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2886     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2887
2888     if (HasSelection())
2889         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2890     else
2891         SetAndShowDefaultStyle(attr);
2892     return true;
2893 }
2894
2895 /// Apply italic to the selection
2896 bool wxRichTextCtrl::ApplyItalicToSelection()
2897 {
2898     wxRichTextAttr attr;
2899     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2900     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2901
2902     if (HasSelection())
2903         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2904     else
2905         SetAndShowDefaultStyle(attr);
2906     return true;
2907 }
2908
2909 /// Apply underline to the selection
2910 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2911 {
2912     wxRichTextAttr attr;
2913     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2914     attr.SetFontUnderlined(!IsSelectionUnderlined());
2915
2916     if (HasSelection())
2917         return SetStyleEx(GetSelectionRange(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_CHARACTERS_ONLY);
2918     else
2919         SetAndShowDefaultStyle(attr);
2920     return true;
2921 }
2922
2923 /// Is all of the selection aligned according to the specified flag?
2924 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment)
2925 {
2926     wxRichTextRange range;
2927     if (HasSelection())
2928         range = GetSelectionRange();
2929     else
2930         range = wxRichTextRange(GetCaretPosition()+1, GetCaretPosition()+2);
2931
2932     wxRichTextAttr attr;
2933     attr.SetAlignment(alignment);
2934
2935     return HasParagraphAttributes(range, attr);
2936 }
2937
2938 /// Apply alignment to the selection
2939 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2940 {
2941     wxRichTextAttr attr;
2942     attr.SetAlignment(alignment);
2943     if (HasSelection())
2944         return SetStyle(GetSelectionRange(), attr);
2945     else
2946     {
2947         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2948         if (para)
2949             return SetStyleEx(para->GetRange().FromInternal(), attr, wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE|wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY);
2950     }
2951     return true;
2952 }
2953
2954 /// Apply a named style to the selection
2955 bool wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
2956 {
2957     // Flags are defined within each definition, so only certain
2958     // attributes are applied.
2959     wxRichTextAttr attr(GetStyleSheet() ? def->GetStyleMergedWithBase(GetStyleSheet()) : def->GetStyle());
2960
2961     int flags = wxRICHTEXT_SETSTYLE_WITH_UNDO|wxRICHTEXT_SETSTYLE_OPTIMIZE;
2962
2963     if (def->IsKindOf(CLASSINFO(wxRichTextListStyleDefinition)))
2964     {
2965         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
2966
2967         wxRichTextRange range;
2968
2969         if (HasSelection())
2970             range = GetSelectionRange();
2971         else
2972         {
2973             long pos = GetAdjustedCaretPosition(GetCaretPosition());
2974             range = wxRichTextRange(pos, pos+1);
2975         }
2976
2977         return SetListStyle(range, (wxRichTextListStyleDefinition*) def, flags);
2978     }
2979
2980     // Make sure the attr has the style name
2981     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
2982     {
2983         attr.SetParagraphStyleName(def->GetName());
2984
2985         // If applying a paragraph style, we only want the paragraph nodes to adopt these
2986         // attributes, and not the leaf nodes. This will allow the content (e.g. text)
2987         // to change its style independently.
2988         flags |= wxRICHTEXT_SETSTYLE_PARAGRAPHS_ONLY;
2989     }
2990     else
2991         attr.SetCharacterStyleName(def->GetName());
2992
2993     if (HasSelection())
2994         return SetStyleEx(GetSelectionRange(), attr, flags);
2995     else
2996     {
2997         SetAndShowDefaultStyle(attr);
2998         return true;
2999     }
3000 }
3001
3002 /// Apply the style sheet to the buffer, for example if the styles have changed.
3003 bool wxRichTextCtrl::ApplyStyleSheet(wxRichTextStyleSheet* styleSheet)
3004 {
3005     if (!styleSheet)
3006         styleSheet = GetBuffer().GetStyleSheet();
3007     if (!styleSheet)
3008         return false;
3009
3010     if (GetBuffer().ApplyStyleSheet(styleSheet))
3011     {
3012         GetBuffer().Invalidate(wxRICHTEXT_ALL);
3013         Refresh(false);
3014         return true;
3015     }
3016     else
3017         return false;
3018 }
3019
3020 /// Sets the default style to the style under the cursor
3021 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
3022 {
3023     wxTextAttrEx attr;
3024     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
3025
3026     // If at the start of a paragraph, use the next position.
3027     long pos = GetAdjustedCaretPosition(GetCaretPosition());
3028
3029     if (GetUncombinedStyle(pos, attr))
3030     {
3031         SetDefaultStyle(attr);
3032         return true;
3033     }
3034
3035     return false;
3036 }
3037
3038 /// Returns the first visible position in the current view
3039 long wxRichTextCtrl::GetFirstVisiblePosition() const
3040 {
3041     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
3042     if (line)
3043         return line->GetAbsoluteRange().GetStart();
3044     else
3045         return 0;
3046 }
3047
3048 /// Get the first visible point in the window
3049 wxPoint wxRichTextCtrl::GetFirstVisiblePoint() const
3050 {
3051     int ppuX, ppuY;
3052     int startXUnits, startYUnits;
3053
3054     GetScrollPixelsPerUnit(& ppuX, & ppuY);
3055     GetViewStart(& startXUnits, & startYUnits);
3056
3057     return wxPoint(startXUnits * ppuX, startYUnits * ppuY);
3058 }
3059
3060 /// The adjusted caret position is the character position adjusted to take
3061 /// into account whether we're at the start of a paragraph, in which case
3062 /// style information should be taken from the next position, not current one.
3063 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
3064 {
3065     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
3066
3067     if (para && (caretPos+1 == para->GetRange().GetStart()))
3068         caretPos ++;
3069     return caretPos;
3070 }
3071
3072 /// Get/set the selection range in character positions. -1, -1 means no selection.
3073 /// The range is in API convention, i.e. a single character selection is denoted
3074 /// by (n, n+1)
3075 wxRichTextRange wxRichTextCtrl::GetSelectionRange() const
3076 {
3077     wxRichTextRange range = GetInternalSelectionRange();
3078     if (range != wxRichTextRange(-2,-2) && range != wxRichTextRange(-1,-1))
3079         range.SetEnd(range.GetEnd() + 1);
3080     return range;
3081 }
3082
3083 void wxRichTextCtrl::SetSelectionRange(const wxRichTextRange& range)
3084 {
3085     wxRichTextRange range1(range);
3086     if (range1 != wxRichTextRange(-2,-2) && range1 != wxRichTextRange(-1,-1) )
3087         range1.SetEnd(range1.GetEnd() - 1);
3088
3089     wxASSERT( range1.GetStart() > range1.GetEnd() );
3090
3091     SetInternalSelectionRange(range1);
3092 }
3093
3094 /// Set list style
3095 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3096 {
3097     return GetBuffer().SetListStyle(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3098 }
3099
3100 bool wxRichTextCtrl::SetListStyle(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3101 {
3102     return GetBuffer().SetListStyle(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3103 }
3104
3105 /// Clear list for given range
3106 bool wxRichTextCtrl::ClearListStyle(const wxRichTextRange& range, int flags)
3107 {
3108     return GetBuffer().ClearListStyle(range.ToInternal(), flags);
3109 }
3110
3111 /// Number/renumber any list elements in the given range
3112 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int startFrom, int specifiedLevel)
3113 {
3114     return GetBuffer().NumberList(range.ToInternal(), def, flags, startFrom, specifiedLevel);
3115 }
3116
3117 bool wxRichTextCtrl::NumberList(const wxRichTextRange& range, const wxString& defName, int flags, int startFrom, int specifiedLevel)
3118 {
3119     return GetBuffer().NumberList(range.ToInternal(), defName, flags, startFrom, specifiedLevel);
3120 }
3121
3122 /// Promote the list items within the given range. promoteBy can be a positive or negative number, e.g. 1 or -1
3123 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, wxRichTextListStyleDefinition* def, int flags, int specifiedLevel)
3124 {
3125     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), def, flags, specifiedLevel);
3126 }
3127
3128 bool wxRichTextCtrl::PromoteList(int promoteBy, const wxRichTextRange& range, const wxString& defName, int flags, int specifiedLevel)
3129 {
3130     return GetBuffer().PromoteList(promoteBy, range.ToInternal(), defName, flags, specifiedLevel);
3131 }
3132
3133 /// Deletes the content in the given range
3134 bool wxRichTextCtrl::Delete(const wxRichTextRange& range)
3135 {
3136     return GetBuffer().DeleteRangeWithUndo(range.ToInternal(), this);
3137 }
3138
3139 const wxArrayString& wxRichTextCtrl::GetAvailableFontNames()
3140 {
3141     if (sm_availableFontNames.GetCount() == 0)
3142     {
3143         sm_availableFontNames = wxFontEnumerator::GetFacenames();
3144         sm_availableFontNames.Sort();
3145     }
3146     return sm_availableFontNames;
3147 }
3148
3149 void wxRichTextCtrl::ClearAvailableFontNames()
3150 {
3151     sm_availableFontNames.Clear();
3152 }
3153
3154 #endif
3155     // wxUSE_RICHTEXT