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/settings.h"
  26     #include "wx/menu.h"
  27     #include "wx/intl.h"
  28     #include "wx/log.h"
  29     #include "wx/stopwatch.h"
  30 #endif
  31
  32 #include "wx/textfile.h"
  33 #include "wx/ffile.h"
  34 #include "wx/filename.h"
  35 #include "wx/dcbuffer.h"
  36 #include "wx/arrimpl.cpp"
  37
  38 // DLL options compatibility check:
  39 #include "wx/app.h"
  40 WX_CHECK_BUILD_OPTIONS("wxRichTextCtrl")
  41
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_SELECTED)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_DESELECTED)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_CLICK)
  45 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK)
  46 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK)
  47 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK)
  48 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RETURN)
  49
  50 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
  51 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
  52 #else
  53 IMPLEMENT_CLASS( wxRichTextCtrl, wxScrolledWindow )
  54 #endif
  55
  56 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
  57
  58 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
  59 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
  60 #else
  61 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxScrolledWindow )
  62 #endif
  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_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
  78
  79     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
  80     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
  81
  82     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
  83     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
  84
  85     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
  86     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
  87
  88     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
  89     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
  90
  91     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
  92     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
  93
  94     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
  95     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
  96
  97     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
  98     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
  99 END_EVENT_TABLE()
 100
 101 /*!
 102  * wxRichTextCtrl
 103  */
 104
 105 wxRichTextCtrl::wxRichTextCtrl()
 106 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 107     : wxScrollHelper(this)
 108 #endif
 109 {
 110     Init();
 111 }
 112
 113 wxRichTextCtrl::wxRichTextCtrl( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style)
 114 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 115     : wxScrollHelper(this)
 116 #endif
 117 {
 118     Init();
 119     Create(parent, id, value, pos, size, style);
 120 }
 121
 122 /// Creation
 123 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxString& value, const wxPoint& pos, const wxSize& size, long style)
 124 {
 125 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 126     if (!wxTextCtrlBase::Create(parent, id, pos, size, style|wxFULL_REPAINT_ON_RESIZE
 127         ))
 128         return false;
 129 #else
 130     if (!wxScrolledWindow::Create(parent, id, pos, size, style|wxFULL_REPAINT_ON_RESIZE
 131         ))
 132         return false;
 133 #endif
 134
 135     if (!GetFont().Ok())
 136     {
 137         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 138     }
 139
 140     GetBuffer().SetRichTextCtrl(this);
 141
 142     wxTextAttrEx attributes;
 143     attributes.SetFont(GetFont());
 144     attributes.SetTextColour(*wxBLACK);
 145     attributes.SetBackgroundColour(*wxWHITE);
 146     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 147     attributes.SetFlags(wxTEXT_ATTR_ALL);
 148
 149     SetDefaultStyle(attributes);
 150     SetBasicStyle(attributes);
 151
 152     SetBackgroundColour(*wxWHITE);
 153     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 154
 155     // Tell the sizers to use the given or best size
 156     SetBestFittingSize(size);
 157
 158     // Create a buffer
 159     RecreateBuffer(size);
 160
 161     SetCursor(wxCursor(wxCURSOR_IBEAM));
 162
 163     if (!value.IsEmpty())
 164         SetValue(value);
 165
 166     return true;
 167 }
 168
 169 wxRichTextCtrl::~wxRichTextCtrl()
 170 {
 171     delete m_contextMenu;
 172 }
 173
 174 /// Member initialisation
 175 void wxRichTextCtrl::Init()
 176 {
 177     m_freezeCount = 0;
 178     m_contextMenu = NULL;
 179     m_caret = NULL;
 180     m_caretPosition = -1;
 181     m_selectionRange.SetRange(-2, -2);
 182     m_selectionAnchor = -2;
 183     m_editable = true;
 184     m_caretAtLineStart = false;
 185     m_dragging = false;
 186     m_fullLayoutRequired = false;
 187     m_fullLayoutTime = 0;
 188     m_fullLayoutSavedPosition = 0;
 189     m_delayedLayoutThreshold = wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD;
 190     m_caretPositionForDefaultStyle = -2;
 191 }
 192
 193 /// Call Freeze to prevent refresh
 194 void wxRichTextCtrl::Freeze()
 195 {
 196     m_freezeCount ++;
 197 }
 198
 199 /// Call Thaw to refresh
 200 void wxRichTextCtrl::Thaw()
 201 {
 202     m_freezeCount --;
 203
 204     if (m_freezeCount == 0)
 205     {
 206         SetupScrollbars();
 207         Refresh(false);
 208     }
 209 }
 210
 211 /// Clear all text
 212 void wxRichTextCtrl::Clear()
 213 {
 214     m_buffer.Reset();
 215     m_buffer.SetDirty(true);
 216     m_caretPosition = -1;
 217     m_caretPositionForDefaultStyle = -2;
 218     m_caretAtLineStart = false;
 219     m_selectionRange.SetRange(-2, -2);
 220
 221     SetScrollbars(0, 0, 0, 0, 0, 0);
 222
 223     if (m_freezeCount == 0)
 224     {
 225         SetupScrollbars();
 226         Refresh(false);
 227     }
 228     SendUpdateEvent();
 229 }
 230
 231 /// Painting
 232 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 233 {
 234     if (GetCaret())
 235         GetCaret()->Hide();
 236
 237     {
 238         wxBufferedPaintDC dc(this, m_bufferBitmap);
 239         //wxLogDebug(wxT("OnPaint"));
 240
 241         PrepareDC(dc);
 242
 243         if (m_freezeCount > 0)
 244             return;
 245
 246         dc.SetFont(GetFont());
 247
 248         // Paint the background
 249         PaintBackground(dc);
 250
 251         wxRegion dirtyRegion = GetUpdateRegion();
 252
 253         wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 254         wxRect availableSpace(GetClientSize());
 255         if (GetBuffer().GetDirty())
 256         {
 257             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 258             GetBuffer().SetDirty(false);
 259             SetupScrollbars();
 260         }
 261
 262         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 263     }
 264
 265     if (GetCaret())
 266         GetCaret()->Show();
 267
 268     PositionCaret();
 269 }
 270
 271 // Empty implementation, to prevent flicker
 272 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 273 {
 274 }
 275
 276 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 277 {
 278     wxCaret* caret = new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16);
 279     SetCaret(caret);
 280     caret->Show();
 281     PositionCaret();
 282
 283     if (!IsFrozen())
 284         Refresh(false);
 285 }
 286
 287 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 288 {
 289     SetCaret(NULL);
 290
 291     if (!IsFrozen())
 292         Refresh(false);
 293 }
 294
 295 /// Left-click
 296 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 297 {
 298     SetFocus();
 299
 300     wxClientDC dc(this);
 301     PrepareDC(dc);
 302     dc.SetFont(GetFont());
 303
 304     long position = 0;
 305     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 306
 307     if (hit != wxRICHTEXT_HITTEST_NONE)
 308     {
 309         m_dragStart = event.GetLogicalPosition(dc);
 310         m_dragging = true;
 311         CaptureMouse();
 312
 313         SelectNone();
 314
 315         bool caretAtLineStart = false;
 316
 317         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 318         {
 319             // If we're at the start of a line (but not first in para)
 320             // then we should keep the caret showing at the start of the line
 321             // by showing the m_caretAtLineStart flag.
 322             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 323             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 324
 325             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 326                 caretAtLineStart = true;
 327             position --;
 328         }
 329
 330         MoveCaret(position, caretAtLineStart);
 331         SetDefaultStyleToCursorStyle();
 332
 333 #if 0
 334         wxWindow* p = GetParent();
 335         while (p && !p->IsKindOf(CLASSINFO(wxFrame)))
 336             p = p->GetParent();
 337
 338         wxFrame* frame = wxDynamicCast(p, wxFrame);
 339         if (frame)
 340         {
 341             wxString msg = wxString::Format(wxT("Found position %ld"), position);
 342             frame->SetStatusText(msg, 1);
 343         }
 344 #endif
 345     }
 346
 347     event.Skip();
 348 }
 349
 350 /// Left-up
 351 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& WXUNUSED(event))
 352 {
 353     if (m_dragging)
 354     {
 355         m_dragging = false;
 356         if (GetCapture() == this)
 357             ReleaseMouse();
 358     }
 359 }
 360
 361 /// Left-click
 362 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 363 {
 364     if (!event.Dragging())
 365     {
 366         event.Skip();
 367         return;
 368     }
 369
 370     wxClientDC dc(this);
 371     PrepareDC(dc);
 372     dc.SetFont(GetFont());
 373
 374     long position = 0;
 375     wxPoint logicalPt = event.GetLogicalPosition(dc);
 376     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 377
 378     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 379     {
 380         // TODO: test closeness
 381
 382         bool caretAtLineStart = false;
 383
 384         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 385         {
 386             // If we're at the start of a line (but not first in para)
 387             // then we should keep the caret showing at the start of the line
 388             // by showing the m_caretAtLineStart flag.
 389             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 390             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 391
 392             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 393                 caretAtLineStart = true;
 394             position --;
 395         }
 396
 397         if (m_caretPosition != position)
 398         {
 399             bool extendSel = ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 400
 401             MoveCaret(position, caretAtLineStart);
 402             SetDefaultStyleToCursorStyle();
 403
 404             if (extendSel)
 405                 Refresh(false);
 406         }
 407     }
 408 }
 409
 410 /// Right-click
 411 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 412 {
 413     SetFocus();
 414     event.Skip();
 415 }
 416
 417 /// Left-double-click
 418 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& event)
 419 {
 420     event.Skip();
 421 }
 422
 423 /// Middle-click
 424 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 425 {
 426     event.Skip();
 427 }
 428
 429 /// Key press
 430 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 431 {
 432     int flags = 0;
 433     if (event.ControlDown())
 434         flags |= wxRICHTEXT_CTRL_DOWN;
 435     if (event.ShiftDown())
 436         flags |= wxRICHTEXT_SHIFT_DOWN;
 437     if (event.AltDown())
 438         flags |= wxRICHTEXT_ALT_DOWN;
 439
 440     if (event.GetKeyCode() == WXK_LEFT ||
 441         event.GetKeyCode() == WXK_RIGHT ||
 442         event.GetKeyCode() == WXK_UP ||
 443         event.GetKeyCode() == WXK_DOWN ||
 444         event.GetKeyCode() == WXK_HOME ||
 445         event.GetKeyCode() == WXK_PAGEUP ||
 446         event.GetKeyCode() == WXK_PAGEDOWN ||
 447         event.GetKeyCode() == WXK_END)
 448     {
 449         KeyboardNavigate(event.GetKeyCode(), flags);
 450         return;
 451     }
 452
 453     // all the other keys modify the controls contents which shouldn't be
 454     // possible if we're read-only
 455     if ( !IsEditable() )
 456     {
 457         event.Skip();
 458         return;
 459     }
 460
 461     if (event.GetKeyCode() == WXK_RETURN)
 462     {
 463         BeginBatchUndo(_("Insert Text"));
 464
 465         long newPos = m_caretPosition;
 466
 467         DeleteSelectedContent(& newPos);
 468
 469         GetBuffer().InsertNewlineWithUndo(newPos+1, this);
 470
 471         wxRichTextEvent cmdEvent(
 472             wxEVT_COMMAND_RICHTEXT_RETURN,
 473             GetId());
 474         cmdEvent.SetEventObject(this);
 475         cmdEvent.SetFlags(flags);
 476         GetEventHandler()->ProcessEvent(cmdEvent);
 477
 478         EndBatchUndo();
 479         SetDefaultStyleToCursorStyle();
 480
 481         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 482     }
 483     else if (event.GetKeyCode() == WXK_BACK)
 484     {
 485         BeginBatchUndo(_("Delete Text"));
 486
 487         // Submit range in character positions, which are greater than caret positions,
 488         // so subtract 1 for deleted character and add 1 for conversion to character position.
 489         if (m_caretPosition > -1 && !HasSelection())
 490         {
 491             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition, m_caretPosition),
 492                 m_caretPosition,   // Current caret position
 493                 m_caretPosition-1, // New caret position
 494                 this);
 495         }
 496         else
 497             DeleteSelectedContent();
 498
 499         EndBatchUndo();
 500
 501         // Shouldn't this be in Do()?
 502         if (GetLastPosition() == -1)
 503         {
 504             GetBuffer().Reset();
 505
 506             m_caretPosition = -1;
 507             PositionCaret();
 508             SetDefaultStyleToCursorStyle();
 509         }
 510
 511         ScrollIntoView(m_caretPosition, WXK_LEFT);
 512     }
 513     else if (event.GetKeyCode() == WXK_DELETE)
 514     {
 515         BeginBatchUndo(_("Delete Text"));
 516
 517         // Submit range in character positions, which are greater than caret positions,
 518         if (m_caretPosition < GetBuffer().GetRange().GetEnd()+1 && !HasSelection())
 519         {
 520             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition+1, m_caretPosition+1),
 521                 m_caretPosition,   // Current caret position
 522                 m_caretPosition+1, // New caret position
 523                 this);
 524         }
 525         else
 526             DeleteSelectedContent();
 527
 528         EndBatchUndo();
 529
 530         // Shouldn't this be in Do()?
 531         if (GetLastPosition() == -1)
 532         {
 533             GetBuffer().Reset();
 534
 535             m_caretPosition = -1;
 536             PositionCaret();
 537             SetDefaultStyleToCursorStyle();
 538         }
 539     }
 540     else
 541     {
 542         BeginBatchUndo(_("Insert Text"));
 543
 544         long newPos = m_caretPosition;
 545         DeleteSelectedContent(& newPos);
 546
 547         wxString str = (wxChar) event.GetKeyCode();
 548         GetBuffer().InsertTextWithUndo(newPos+1, str, this);
 549
 550         EndBatchUndo();
 551
 552         SetDefaultStyleToCursorStyle();
 553         ScrollIntoView(m_caretPosition, WXK_RIGHT);
 554     }
 555 }
 556
 557 /// Delete content if there is a selection, e.g. when pressing a key.
 558 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
 559 {
 560     if (HasSelection())
 561     {
 562         long pos = m_selectionRange.GetStart();
 563         GetBuffer().DeleteRangeWithUndo(m_selectionRange,
 564             m_caretPosition,       // Current caret position
 565             pos,    // New caret position
 566             this);
 567         m_selectionRange.SetRange(-2, -2);
 568
 569         if (newPos)
 570             *newPos = pos-1;
 571         return true;
 572     }
 573     else
 574         return false;
 575 }
 576
 577 /// Keyboard navigation
 578
 579 /*
 580
 581 Left:       left one character
 582 Right:      right one character
 583 Up:         up one line
 584 Down:       down one line
 585 Ctrl-Left:  left one word
 586 Ctrl-Right: right one word
 587 Ctrl-Up:    previous paragraph start
 588 Ctrl-Down:  next start of paragraph
 589 Home:       start of line
 590 End:        end of line
 591 Ctrl-Home:  start of document
 592 Ctrl-End:   end of document
 593 Page-Up:    Up a screen
 594 Page-Down:  Down a screen
 595
 596 Maybe:
 597
 598 Ctrl-Alt-PgUp: Start of window
 599 Ctrl-Alt-PgDn: End of window
 600 F8:         Start selection mode
 601 Esc:        End selection mode
 602
 603 Adding Shift does the above but starts/extends selection.
 604
 605
 606  */
 607
 608 bool wxRichTextCtrl::KeyboardNavigate(int keyCode, int flags)
 609 {
 610     bool success = false;
 611
 612     if (keyCode == WXK_RIGHT)
 613     {
 614         if (flags & wxRICHTEXT_CTRL_DOWN)
 615             success = WordRight(1, flags);
 616         else
 617             success = MoveRight(1, flags);
 618     }
 619     else if (keyCode == WXK_LEFT)
 620     {
 621         if (flags & wxRICHTEXT_CTRL_DOWN)
 622             success = WordLeft(1, flags);
 623         else
 624             success = MoveLeft(1, flags);
 625     }
 626     else if (keyCode == WXK_UP)
 627     {
 628         if (flags & wxRICHTEXT_CTRL_DOWN)
 629             success = MoveToParagraphStart(flags);
 630         else
 631             success = MoveUp(1, flags);
 632     }
 633     else if (keyCode == WXK_DOWN)
 634     {
 635         if (flags & wxRICHTEXT_CTRL_DOWN)
 636             success = MoveToParagraphEnd(flags);
 637         else
 638             success = MoveDown(1, flags);
 639     }
 640     else if (keyCode == WXK_PAGEUP)
 641     {
 642         success = PageUp(1, flags);
 643     }
 644     else if (keyCode == WXK_PAGEDOWN)
 645     {
 646         success = PageDown(1, flags);
 647     }
 648     else if (keyCode == WXK_HOME)
 649     {
 650         if (flags & wxRICHTEXT_CTRL_DOWN)
 651             success = MoveHome(flags);
 652         else
 653             success = MoveToLineStart(flags);
 654     }
 655     else if (keyCode == WXK_END)
 656     {
 657         if (flags & wxRICHTEXT_CTRL_DOWN)
 658             success = MoveEnd(flags);
 659         else
 660             success = MoveToLineEnd(flags);
 661     }
 662
 663     if (success)
 664     {
 665         ScrollIntoView(m_caretPosition, keyCode);
 666         SetDefaultStyleToCursorStyle();
 667     }
 668
 669     return success;
 670 }
 671
 672 /// Extend the selection. Selections are in caret positions.
 673 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
 674 {
 675     if (flags & wxRICHTEXT_SHIFT_DOWN)
 676     {
 677         // If not currently selecting, start selecting
 678         if (m_selectionRange.GetStart() == -2)
 679         {
 680             m_selectionAnchor = oldPos;
 681
 682             if (oldPos > newPos)
 683                 m_selectionRange.SetRange(newPos+1, oldPos);
 684             else
 685                 m_selectionRange.SetRange(oldPos+1, newPos);
 686         }
 687         else
 688         {
 689             // Always ensure that the selection range start is greater than
 690             // the end.
 691             if (newPos > m_selectionAnchor)
 692                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
 693             else
 694                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
 695         }
 696
 697         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
 698         {
 699             wxLogDebug(wxT("Strange selection range"));
 700         }
 701
 702         return true;
 703     }
 704     else
 705         return false;
 706 }
 707
 708 /// Scroll into view, returning true if we scrolled.
 709 /// This takes a _caret_ position.
 710 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
 711 {
 712     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
 713
 714     if (!line)
 715         return false;
 716
 717     int ppuX, ppuY;
 718     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 719
 720     int startXUnits, startYUnits;
 721     GetViewStart(& startXUnits, & startYUnits);
 722     int startY = startYUnits * ppuY;
 723
 724     int sx = 0, sy = 0;
 725     GetVirtualSize(& sx, & sy);
 726     int sxUnits = 0;
 727     int syUnits = 0;
 728     if (ppuY != 0)
 729         syUnits = sy/ppuY;
 730
 731     wxRect rect = line->GetRect();
 732
 733     bool scrolled = false;
 734
 735     wxSize clientSize = GetClientSize();
 736
 737     // Going down
 738     if (keyCode == WXK_DOWN || keyCode == WXK_RIGHT || keyCode == WXK_END || keyCode == WXK_PAGEDOWN)
 739     {
 740         if ((rect.y + rect.height) > (clientSize.y + startY))
 741         {
 742             // Make it scroll so this item is at the bottom
 743             // of the window
 744             int y = rect.y - (clientSize.y - rect.height);
 745             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 746
 747             // If we're still off the screen, scroll another line down
 748             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
 749                 yUnits ++;
 750
 751             if (startYUnits != yUnits)
 752             {
 753                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 754                 scrolled = true;
 755             }
 756         }
 757         else if (rect.y < startY)
 758         {
 759             // Make it scroll so this item is at the top
 760             // of the window
 761             int y = rect.y ;
 762             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 763
 764             if (startYUnits != yUnits)
 765             {
 766                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 767                 scrolled = true;
 768             }
 769         }
 770     }
 771     // Going up
 772     else if (keyCode == WXK_UP || keyCode == WXK_LEFT || keyCode == WXK_HOME || keyCode == WXK_PAGEUP )
 773     {
 774         if (rect.y < startY)
 775         {
 776             // Make it scroll so this item is at the top
 777             // of the window
 778             int y = rect.y ;
 779             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 780
 781             if (startYUnits != yUnits)
 782             {
 783                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 784                 scrolled = true;
 785             }
 786         }
 787         else if ((rect.y + rect.height) > (clientSize.y + startY))
 788         {
 789             // Make it scroll so this item is at the bottom
 790             // of the window
 791             int y = rect.y - (clientSize.y - rect.height);
 792             int yUnits = (int) (0.5 + ((float) y)/(float) ppuY);
 793
 794             // If we're still off the screen, scroll another line down
 795             if ((rect.y + rect.height) > (clientSize.y + (yUnits*ppuY)))
 796                 yUnits ++;
 797
 798             if (startYUnits != yUnits)
 799             {
 800                 SetScrollbars(ppuX, ppuY, sxUnits, syUnits, 0, yUnits);
 801                 scrolled = true;
 802             }
 803         }
 804     }
 805     PositionCaret();
 806
 807     return scrolled;
 808 }
 809
 810 /// Is the given position visible on the screen?
 811 bool wxRichTextCtrl::IsPositionVisible(long pos) const
 812 {
 813     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
 814
 815     if (!line)
 816         return false;
 817
 818     int ppuX, ppuY;
 819     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 820
 821     int startX, startY;
 822     GetViewStart(& startX, & startY);
 823     startX = 0;
 824     startY = startY * ppuY;
 825
 826     int sx = 0, sy = 0;
 827     GetVirtualSize(& sx, & sy);
 828     sx = 0;
 829     if (ppuY != 0)
 830         sy = sy/ppuY;
 831
 832     wxRect rect = line->GetRect();
 833
 834     wxSize clientSize = GetClientSize();
 835
 836     return !(((rect.y + rect.height) > (clientSize.y + startY)) || rect.y < startY);
 837 }
 838
 839 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
 840 {
 841     m_caretPosition = position;
 842     m_caretAtLineStart = showAtLineStart;
 843 }
 844
 845 /// Move caret one visual step forward: this may mean setting a flag
 846 /// and keeping the same position if we're going from the end of one line
 847 /// to the start of the next, which may be the exact same caret position.
 848 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
 849 {
 850     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
 851
 852     // Only do the check if we're not at the end of the paragraph (where things work OK
 853     // anyway)
 854     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
 855     {
 856         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
 857
 858         if (line)
 859         {
 860             wxRichTextRange lineRange = line->GetAbsoluteRange();
 861
 862             // We're at the end of a line. See whether we need to
 863             // stay at the same actual caret position but change visual
 864             // position, or not.
 865             if (oldPosition == lineRange.GetEnd())
 866             {
 867                 if (m_caretAtLineStart)
 868                 {
 869                     // We're already at the start of the line, so actually move on now.
 870                     m_caretPosition = oldPosition + 1;
 871                     m_caretAtLineStart = false;
 872                 }
 873                 else
 874                 {
 875                     // We're showing at the end of the line, so keep to
 876                     // the same position but indicate that we're to show
 877                     // at the start of the next line.
 878                     m_caretPosition = oldPosition;
 879                     m_caretAtLineStart = true;
 880                 }
 881                 SetDefaultStyleToCursorStyle();
 882                 return;
 883             }
 884         }
 885     }
 886     m_caretPosition ++;
 887     SetDefaultStyleToCursorStyle();
 888 }
 889
 890 /// Move caret one visual step backward: this may mean setting a flag
 891 /// and keeping the same position if we're going from the end of one line
 892 /// to the start of the next, which may be the exact same caret position.
 893 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
 894 {
 895     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
 896
 897     // Only do the check if we're not at the start of the paragraph (where things work OK
 898     // anyway)
 899     if (para && (oldPosition != para->GetRange().GetStart()))
 900     {
 901         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
 902
 903         if (line)
 904         {
 905             wxRichTextRange lineRange = line->GetAbsoluteRange();
 906
 907             // We're at the start of a line. See whether we need to
 908             // stay at the same actual caret position but change visual
 909             // position, or not.
 910             if (oldPosition == lineRange.GetStart())
 911             {
 912                 m_caretPosition = oldPosition-1;
 913                 m_caretAtLineStart = true;
 914                 return;
 915             }
 916             else if (oldPosition == lineRange.GetEnd())
 917             {
 918                 if (m_caretAtLineStart)
 919                 {
 920                     // We're at the start of the line, so keep the same caret position
 921                     // but clear the start-of-line flag.
 922                     m_caretPosition = oldPosition;
 923                     m_caretAtLineStart = false;
 924                 }
 925                 else
 926                 {
 927                     // We're showing at the end of the line, so go back
 928                     // to the previous character position.
 929                     m_caretPosition = oldPosition - 1;
 930                 }
 931                 SetDefaultStyleToCursorStyle();
 932                 return;
 933             }
 934         }
 935     }
 936     m_caretPosition --;
 937     SetDefaultStyleToCursorStyle();
 938 }
 939
 940 /// Move right
 941 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
 942 {
 943     long endPos = GetBuffer().GetRange().GetEnd();
 944
 945     if (m_caretPosition + noPositions < endPos)
 946     {
 947         long oldPos = m_caretPosition;
 948         long newPos = m_caretPosition + noPositions;
 949
 950         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
 951         if (!extendSel)
 952             SelectNone();
 953
 954         // Determine by looking at oldPos and m_caretPosition whether
 955         // we moved from the end of a line to the start of the next line, in which case
 956         // we want to adjust the caret position such that it is positioned at the
 957         // start of the next line, rather than jumping past the first character of the
 958         // line.
 959         if (noPositions == 1 && !extendSel)
 960             MoveCaretForward(oldPos);
 961         else
 962             SetCaretPosition(newPos);
 963
 964         PositionCaret();
 965         SetDefaultStyleToCursorStyle();
 966
 967         if (extendSel)
 968             Refresh(false);
 969         return true;
 970     }
 971     else
 972         return false;
 973 }
 974
 975 /// Move left
 976 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
 977 {
 978     long startPos = -1;
 979
 980     if (m_caretPosition > startPos - noPositions + 1)
 981     {
 982         long oldPos = m_caretPosition;
 983         long newPos = m_caretPosition - noPositions;
 984         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
 985         if (!extendSel)
 986             SelectNone();
 987
 988         if (noPositions == 1 && !extendSel)
 989             MoveCaretBack(oldPos);
 990         else
 991             SetCaretPosition(newPos);
 992
 993         PositionCaret();
 994         SetDefaultStyleToCursorStyle();
 995
 996         if (extendSel)
 997             Refresh(false);
 998         return true;
 999     }
1000     else
1001         return false;
1002 }
1003
1004 /// Move up
1005 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
1006 {
1007     return MoveDown(- noLines, flags);
1008 }
1009
1010 /// Move up
1011 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
1012 {
1013     if (!GetCaret())
1014         return false;
1015
1016     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
1017     wxPoint pt = GetCaret()->GetPosition();
1018     long newLine = lineNumber + noLines;
1019
1020     if (lineNumber != -1)
1021     {
1022         if (noLines > 0)
1023         {
1024             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
1025
1026             if (newLine > lastLine)
1027                 return false;
1028         }
1029         else
1030         {
1031             if (newLine < 0)
1032                 return false;
1033         }
1034     }
1035
1036     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1037     if (lineObj)
1038     {
1039         pt.y = lineObj->GetAbsolutePosition().y + 2;
1040     }
1041     else
1042         return false;
1043
1044     long newPos = 0;
1045     wxClientDC dc(this);
1046     PrepareDC(dc);
1047     dc.SetFont(GetFont());
1048
1049     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1050
1051     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1052     {
1053         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1054         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1055         // so we view the caret at the start of the line.
1056         bool caretLineStart = false;
1057         if (hitTest == wxRICHTEXT_HITTEST_BEFORE)
1058         {
1059             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1060             wxRichTextRange lineRange;
1061             if (thisLine)
1062                 lineRange = thisLine->GetAbsoluteRange();
1063
1064             if (thisLine && (newPos-1) == lineRange.GetEnd())
1065             {
1066                 newPos --;
1067                 caretLineStart = true;
1068             }
1069             else
1070             {
1071                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1072                 if (para && para->GetRange().GetStart() == newPos)
1073                     newPos --;
1074             }
1075         }
1076
1077         long newSelEnd = newPos;
1078
1079         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1080         if (!extendSel)
1081             SelectNone();
1082
1083         SetCaretPosition(newPos, caretLineStart);
1084         PositionCaret();
1085         SetDefaultStyleToCursorStyle();
1086
1087         if (extendSel)
1088             Refresh(false);
1089         return true;
1090     }
1091
1092     return false;
1093 }
1094
1095 /// Move to the end of the paragraph
1096 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1097 {
1098     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1099     if (para)
1100     {
1101         long newPos = para->GetRange().GetEnd() - 1;
1102         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1103         if (!extendSel)
1104             SelectNone();
1105
1106         SetCaretPosition(newPos);
1107         PositionCaret();
1108         SetDefaultStyleToCursorStyle();
1109
1110         if (extendSel)
1111             Refresh(false);
1112         return true;
1113     }
1114
1115     return false;
1116 }
1117
1118 /// Move to the start of the paragraph
1119 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1120 {
1121     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1122     if (para)
1123     {
1124         long newPos = para->GetRange().GetStart() - 1;
1125         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1126         if (!extendSel)
1127             SelectNone();
1128
1129         SetCaretPosition(newPos);
1130         PositionCaret();
1131         SetDefaultStyleToCursorStyle();
1132
1133         if (extendSel)
1134             Refresh(false);
1135         return true;
1136     }
1137
1138     return false;
1139 }
1140
1141 /// Move to the end of the line
1142 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1143 {
1144     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1145
1146     if (line)
1147     {
1148         wxRichTextRange lineRange = line->GetAbsoluteRange();
1149         long newPos = lineRange.GetEnd();
1150         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1151         if (!extendSel)
1152             SelectNone();
1153
1154         SetCaretPosition(newPos);
1155         PositionCaret();
1156         SetDefaultStyleToCursorStyle();
1157
1158         if (extendSel)
1159             Refresh(false);
1160         return true;
1161     }
1162
1163     return false;
1164 }
1165
1166 /// Move to the start of the line
1167 bool wxRichTextCtrl::MoveToLineStart(int flags)
1168 {
1169     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1170     if (line)
1171     {
1172         wxRichTextRange lineRange = line->GetAbsoluteRange();
1173         long newPos = lineRange.GetStart()-1;
1174
1175         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1176         if (!extendSel)
1177             SelectNone();
1178
1179         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1180
1181         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1182         PositionCaret();
1183         SetDefaultStyleToCursorStyle();
1184
1185         if (extendSel)
1186             Refresh(false);
1187         return true;
1188     }
1189
1190     return false;
1191 }
1192
1193 /// Move to the start of the buffer
1194 bool wxRichTextCtrl::MoveHome(int flags)
1195 {
1196     if (m_caretPosition != -1)
1197     {
1198         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1199         if (!extendSel)
1200             SelectNone();
1201
1202         SetCaretPosition(-1);
1203         PositionCaret();
1204         SetDefaultStyleToCursorStyle();
1205
1206         if (extendSel)
1207             Refresh(false);
1208         return true;
1209     }
1210     else
1211         return false;
1212 }
1213
1214 /// Move to the end of the buffer
1215 bool wxRichTextCtrl::MoveEnd(int flags)
1216 {
1217     long endPos = GetBuffer().GetRange().GetEnd()-1;
1218
1219     if (m_caretPosition != endPos)
1220     {
1221         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1222         if (!extendSel)
1223             SelectNone();
1224
1225         SetCaretPosition(endPos);
1226         PositionCaret();
1227         SetDefaultStyleToCursorStyle();
1228
1229         if (extendSel)
1230             Refresh(false);
1231         return true;
1232     }
1233     else
1234         return false;
1235 }
1236
1237 /// Move noPages pages up
1238 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1239 {
1240     return PageDown(- noPages, flags);
1241 }
1242
1243 /// Move noPages pages down
1244 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1245 {
1246     // Calculate which line occurs noPages * screen height further down.
1247     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1248     if (line)
1249     {
1250         wxSize clientSize = GetClientSize();
1251         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1252
1253         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1254         if (newLine)
1255         {
1256             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1257             long pos = lineRange.GetStart()-1;
1258             if (pos != m_caretPosition)
1259             {
1260                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1261
1262                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1263                 if (!extendSel)
1264                     SelectNone();
1265
1266                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1267                 PositionCaret();
1268                 SetDefaultStyleToCursorStyle();
1269
1270                 if (extendSel)
1271                     Refresh(false);
1272                 return true;
1273             }
1274         }
1275     }
1276
1277     return false;
1278 }
1279
1280 // Finds the caret position for the next word
1281 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1282 {
1283     long endPos = GetBuffer().GetRange().GetEnd();
1284
1285     if (direction > 0)
1286     {
1287         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1288
1289         // First skip current text to space
1290         while (i < endPos && i > -1)
1291         {
1292             // i is in character, not caret positions
1293             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1294             if (text != wxT(" ") && !text.empty())
1295                 i += direction;
1296             else
1297             {
1298                 break;
1299             }
1300         }
1301         while (i < endPos && i > -1)
1302         {
1303             // i is in character, not caret positions
1304             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1305             if (text.empty()) // End of paragraph, or maybe an image
1306                 return wxMax(-1, i - 1);
1307             else if (text == wxT(" ") || text.empty())
1308                 i += direction;
1309             else
1310             {
1311                 // Convert to caret position
1312                 return wxMax(-1, i - 1);
1313             }
1314         }
1315         if (i >= endPos)
1316             return endPos-1;
1317         return i-1;
1318     }
1319     else
1320     {
1321         long i = m_caretPosition;
1322
1323         // First skip white space
1324         while (i < endPos && i > -1)
1325         {
1326             // i is in character, not caret positions
1327             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1328             if (text.empty()) // End of paragraph, or maybe an image
1329                 break;
1330             else if (text == wxT(" ") || text.empty())
1331                 i += direction;
1332             else
1333                 break;
1334         }
1335         // Next skip current text to space
1336         while (i < endPos && i > -1)
1337         {
1338             // i is in character, not caret positions
1339             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1340             if (text != wxT(" ") /* && !text.empty() */)
1341                 i += direction;
1342             else
1343             {
1344                 return i;
1345             }
1346         }
1347         if (i < -1)
1348             return -1;
1349         return i;
1350     }
1351 }
1352
1353 /// Move n words left
1354 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1355 {
1356     long pos = FindNextWordPosition(-1);
1357     if (pos != m_caretPosition)
1358     {
1359         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1360
1361         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1362         if (!extendSel)
1363             SelectNone();
1364
1365         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1366         PositionCaret();
1367         SetDefaultStyleToCursorStyle();
1368
1369         if (extendSel)
1370             Refresh(false);
1371         return true;
1372     }
1373
1374     return false;
1375 }
1376
1377 /// Move n words right
1378 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1379 {
1380     long pos = FindNextWordPosition(1);
1381     if (pos != m_caretPosition)
1382     {
1383         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1384
1385         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1386         if (!extendSel)
1387             SelectNone();
1388
1389         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1390         PositionCaret();
1391         SetDefaultStyleToCursorStyle();
1392
1393         if (extendSel)
1394             Refresh(false);
1395         return true;
1396     }
1397
1398     return false;
1399 }
1400
1401 /// Sizing
1402 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1403 {
1404     // Only do sizing optimization for large buffers
1405     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1406     {
1407         m_fullLayoutRequired = true;
1408         m_fullLayoutTime = wxGetLocalTimeMillis();
1409         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1410         LayoutContent(true /* onlyVisibleRect */);
1411     }
1412     else
1413         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1414
1415     RecreateBuffer();
1416
1417     event.Skip();
1418 }
1419
1420
1421 /// Idle-time processing
1422 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1423 {
1424     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1425
1426     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1427     {
1428         m_fullLayoutRequired = false;
1429         m_fullLayoutTime = 0;
1430         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1431         ShowPosition(m_fullLayoutSavedPosition);
1432         Refresh(false);
1433     }
1434
1435     if (m_caretPositionForDefaultStyle != -2)
1436     {
1437         // If the caret position has changed, no longer reflect the default style
1438         // in the UI.
1439         if (GetCaretPosition() != m_caretPositionForDefaultStyle)
1440             m_caretPositionForDefaultStyle = -2;
1441     }
1442
1443     event.Skip();
1444 }
1445
1446 /// Scrolling
1447 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1448 {
1449     // Not used
1450     event.Skip();
1451 }
1452
1453 /// Set up scrollbars, e.g. after a resize
1454 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1455 {
1456     if (m_freezeCount)
1457         return;
1458
1459     if (GetBuffer().IsEmpty())
1460     {
1461         SetScrollbars(0, 0, 0, 0, 0, 0);
1462         return;
1463     }
1464
1465     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1466     // of pixels. See e.g. wxVScrolledWindow for ideas.
1467     int pixelsPerUnit = 5;
1468     wxSize clientSize = GetClientSize();
1469
1470     int maxHeight = GetBuffer().GetCachedSize().y;
1471
1472     // Round up so we have at least maxHeight pixels
1473     int unitsY = (int) (((float)maxHeight/(float)pixelsPerUnit) + 0.5);
1474
1475     int startX = 0, startY = 0;
1476     if (!atTop)
1477         GetViewStart(& startX, & startY);
1478
1479     int maxPositionX = 0; // wxMax(sz.x - clientSize.x, 0);
1480     int maxPositionY = (int) ((((float)(wxMax((unitsY*pixelsPerUnit) - clientSize.y, 0)))/((float)pixelsPerUnit)) + 0.5);
1481
1482     // Move to previous scroll position if
1483     // possible
1484     SetScrollbars(0, pixelsPerUnit,
1485         0, unitsY,
1486         wxMin(maxPositionX, startX), wxMin(maxPositionY, startY));
1487 }
1488
1489 /// Paint the background
1490 void wxRichTextCtrl::PaintBackground(wxDC& dc)
1491 {
1492     wxColour backgroundColour = GetBackgroundColour();
1493     if (!backgroundColour.Ok())
1494         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
1495
1496     // Clear the background
1497     dc.SetBrush(wxBrush(backgroundColour));
1498     dc.SetPen(*wxTRANSPARENT_PEN);
1499     wxRect windowRect(GetClientSize());
1500     windowRect.x -= 2; windowRect.y -= 2;
1501     windowRect.width += 4; windowRect.height += 4;
1502
1503     // We need to shift the rectangle to take into account
1504     // scrolling. Converting device to logical coordinates.
1505     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
1506     dc.DrawRectangle(windowRect);
1507 }
1508
1509 /// Recreate buffer bitmap if necessary
1510 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
1511 {
1512     wxSize sz = size;
1513     if (sz == wxDefaultSize)
1514         sz = GetClientSize();
1515
1516     if (sz.x < 1 || sz.y < 1)
1517         return false;
1518
1519     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
1520         m_bufferBitmap = wxBitmap(sz.x, sz.y);
1521     return m_bufferBitmap.Ok();
1522 }
1523
1524 // ----------------------------------------------------------------------------
1525 // file IO functions
1526 // ----------------------------------------------------------------------------
1527
1528 bool wxRichTextCtrl::LoadFile(const wxString& filename, int type)
1529 {
1530     bool success = GetBuffer().LoadFile(filename, type);
1531     if (success)
1532         m_filename = filename;
1533
1534     DiscardEdits();
1535     SetInsertionPoint(0);
1536     LayoutContent();
1537     PositionCaret();
1538     SetupScrollbars(true);
1539     Refresh(false);
1540     SendUpdateEvent();
1541
1542     if (success)
1543         return true;
1544     else
1545     {
1546         wxLogError(_("File couldn't be loaded."));
1547
1548         return false;
1549     }
1550 }
1551
1552 bool wxRichTextCtrl::SaveFile(const wxString& filename, int type)
1553 {
1554     wxString filenameToUse = filename.empty() ? m_filename : filename;
1555     if ( filenameToUse.empty() )
1556     {
1557         // what kind of message to give? is it an error or a program bug?
1558         wxLogDebug(wxT("Can't save textctrl to file without filename."));
1559
1560         return false;
1561     }
1562
1563     if (GetBuffer().SaveFile(filenameToUse, type))
1564     {
1565         m_filename = filenameToUse;
1566
1567         DiscardEdits();
1568
1569         return true;
1570
1571     }
1572
1573     wxLogError(_("The text couldn't be saved."));
1574
1575     return false;
1576 }
1577
1578 // ----------------------------------------------------------------------------
1579 // wxRichTextCtrl specific functionality
1580 // ----------------------------------------------------------------------------
1581
1582 /// Add a new paragraph of text to the end of the buffer
1583 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
1584 {
1585     return GetBuffer().AddParagraph(text);
1586 }
1587
1588 /// Add an image
1589 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
1590 {
1591     return GetBuffer().AddImage(image);
1592 }
1593
1594 // ----------------------------------------------------------------------------
1595 // selection and ranges
1596 // ----------------------------------------------------------------------------
1597
1598 void wxRichTextCtrl::SelectAll()
1599 {
1600     SetSelection(0, GetLastPosition());
1601     m_selectionAnchor = -1;
1602 }
1603
1604 /// Select none
1605 void wxRichTextCtrl::SelectNone()
1606 {
1607     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
1608         SetSelection(-2, -2);
1609     m_selectionAnchor = -2;
1610 }
1611
1612 wxString wxRichTextCtrl::GetStringSelection() const
1613 {
1614     long from, to;
1615     GetSelection(&from, &to);
1616
1617     return GetRange(from, to);
1618 }
1619
1620 // do the window-specific processing after processing the update event
1621 #if !wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
1622 void wxRichTextCtrl::DoUpdateWindowUI(wxUpdateUIEvent& event)
1623 {
1624     // call inherited
1625     wxWindowBase::DoUpdateWindowUI(event);
1626
1627     // update text
1628     if ( event.GetSetText() )
1629     {
1630         if ( event.GetText() != GetValue() )
1631             SetValue(event.GetText());
1632     }
1633 }
1634 #endif // !wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
1635
1636 // ----------------------------------------------------------------------------
1637 // hit testing
1638 // ----------------------------------------------------------------------------
1639
1640 wxTextCtrlHitTestResult
1641 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
1642 {
1643     // implement in terms of the other overload as the native ports typically
1644     // can get the position and not (x, y) pair directly (although wxUniv
1645     // directly gets x and y -- and so overrides this method as well)
1646     long pos;
1647     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
1648
1649     if ( rc != wxTE_HT_UNKNOWN )
1650     {
1651         PositionToXY(pos, x, y);
1652     }
1653
1654     return rc;
1655 }
1656
1657 wxTextCtrlHitTestResult
1658 wxRichTextCtrl::HitTest(const wxPoint& pt,
1659                         long * pos) const
1660 {
1661     wxClientDC dc((wxRichTextCtrl*) this);
1662     ((wxRichTextCtrl*)this)->PrepareDC(dc);
1663
1664     // Buffer uses logical position (relative to start of buffer)
1665     // so convert
1666     wxPoint pt2 = GetLogicalPoint(pt);
1667
1668     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt2, *pos);
1669
1670     switch ( hit )
1671     {
1672         case wxRICHTEXT_HITTEST_BEFORE:
1673             return wxTE_HT_BEFORE;
1674
1675         case wxRICHTEXT_HITTEST_AFTER:
1676             return wxTE_HT_BEYOND;
1677
1678         case wxRICHTEXT_HITTEST_ON:
1679             return wxTE_HT_ON_TEXT;
1680     }
1681
1682     return wxTE_HT_UNKNOWN;
1683 }
1684
1685 // ----------------------------------------------------------------------------
1686 // set/get the controls text
1687 // ----------------------------------------------------------------------------
1688
1689 wxString wxRichTextCtrl::GetValue() const
1690 {
1691     return GetBuffer().GetText();
1692 }
1693
1694 wxString wxRichTextCtrl::GetRange(long from, long to) const
1695 {
1696     return GetBuffer().GetTextForRange(wxRichTextRange(from, to));
1697 }
1698
1699 void wxRichTextCtrl::SetValue(const wxString& value)
1700 {
1701     Clear();
1702
1703     // if the text is long enough, it's faster to just set it instead of first
1704     // comparing it with the old one (chances are that it will be different
1705     // anyhow, this comparison is there to avoid flicker for small single-line
1706     // edit controls mostly)
1707     if ( (value.length() > 0x400) || (value != GetValue()) )
1708     {
1709         DoWriteText(value, false /* not selection only */);
1710
1711         // for compatibility, don't move the cursor when doing SetValue()
1712         SetInsertionPoint(0);
1713     }
1714     else // same text
1715     {
1716         // still send an event for consistency
1717         SendUpdateEvent();
1718     }
1719
1720     // we should reset the modified flag even if the value didn't really change
1721
1722     // mark the control as being not dirty - we changed its text, not the
1723     // user
1724     DiscardEdits();
1725 }
1726
1727 void wxRichTextCtrl::WriteText(const wxString& value)
1728 {
1729     DoWriteText(value);
1730 }
1731
1732 void wxRichTextCtrl::DoWriteText(const wxString& value, bool WXUNUSED(selectionOnly))
1733 {
1734     GetBuffer().InsertTextWithUndo(m_caretPosition+1, value, this);
1735 }
1736
1737 void wxRichTextCtrl::AppendText(const wxString& text)
1738 {
1739     SetInsertionPointEnd();
1740
1741     WriteText(text);
1742 }
1743
1744 /// Write an image at the current insertion point
1745 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
1746 {
1747     wxRichTextImageBlock imageBlock;
1748
1749     wxImage image2 = image;
1750     if (imageBlock.MakeImageBlock(image2, bitmapType))
1751         return WriteImage(imageBlock);
1752
1753     return false;
1754 }
1755
1756 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
1757 {
1758     wxRichTextImageBlock imageBlock;
1759
1760     wxImage image;
1761     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
1762         return WriteImage(imageBlock);
1763
1764     return false;
1765 }
1766
1767 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
1768 {
1769     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
1770 }
1771
1772 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
1773 {
1774     if (bitmap.Ok())
1775     {
1776         wxRichTextImageBlock imageBlock;
1777
1778         wxImage image = bitmap.ConvertToImage();
1779         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
1780             return WriteImage(imageBlock);
1781     }
1782
1783     return false;
1784 }
1785
1786 /// Insert a newline (actually paragraph) at the current insertion point.
1787 bool wxRichTextCtrl::Newline()
1788 {
1789     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
1790 }
1791
1792
1793 // ----------------------------------------------------------------------------
1794 // Clipboard operations
1795 // ----------------------------------------------------------------------------
1796
1797 void wxRichTextCtrl::Copy()
1798 {
1799     if (CanCopy())
1800     {
1801         wxRichTextRange range = GetSelectionRange();
1802         GetBuffer().CopyToClipboard(range);
1803     }
1804 }
1805
1806 void wxRichTextCtrl::Cut()
1807 {
1808     if (CanCut())
1809     {
1810         wxRichTextRange range = GetSelectionRange();
1811         GetBuffer().CopyToClipboard(range);
1812
1813         DeleteSelectedContent();
1814         LayoutContent();
1815         Refresh(false);
1816     }
1817 }
1818
1819 void wxRichTextCtrl::Paste()
1820 {
1821     if (CanPaste())
1822     {
1823         BeginBatchUndo(_("Paste"));
1824
1825         long newPos = m_caretPosition;
1826         DeleteSelectedContent(& newPos);
1827
1828         GetBuffer().PasteFromClipboard(newPos);
1829
1830         EndBatchUndo();
1831     }
1832 }
1833
1834 void wxRichTextCtrl::DeleteSelection()
1835 {
1836     if (CanDeleteSelection())
1837     {
1838         DeleteSelectedContent();
1839     }
1840 }
1841
1842 bool wxRichTextCtrl::HasSelection() const
1843 {
1844     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
1845 }
1846
1847 bool wxRichTextCtrl::CanCopy() const
1848 {
1849     // Can copy if there's a selection
1850     return HasSelection();
1851 }
1852
1853 bool wxRichTextCtrl::CanCut() const
1854 {
1855     return HasSelection() && IsEditable();
1856 }
1857
1858 bool wxRichTextCtrl::CanPaste() const
1859 {
1860     if ( !IsEditable() )
1861         return false;
1862
1863     return GetBuffer().CanPasteFromClipboard();
1864 }
1865
1866 bool wxRichTextCtrl::CanDeleteSelection() const
1867 {
1868     return HasSelection() && IsEditable();
1869 }
1870
1871
1872 // ----------------------------------------------------------------------------
1873 // Accessors
1874 // ----------------------------------------------------------------------------
1875
1876 void wxRichTextCtrl::SetEditable(bool editable)
1877 {
1878     m_editable = editable;
1879 }
1880
1881 void wxRichTextCtrl::SetInsertionPoint(long pos)
1882 {
1883     SelectNone();
1884
1885     m_caretPosition = pos - 1;
1886 }
1887
1888 void wxRichTextCtrl::SetInsertionPointEnd()
1889 {
1890     long pos = GetLastPosition();
1891     SetInsertionPoint(pos);
1892 }
1893
1894 long wxRichTextCtrl::GetInsertionPoint() const
1895 {
1896     return m_caretPosition+1;
1897 }
1898
1899 wxTextPos wxRichTextCtrl::GetLastPosition() const
1900 {
1901     return GetBuffer().GetRange().GetEnd();
1902 }
1903
1904 // If the return values from and to are the same, there is no
1905 // selection.
1906 void wxRichTextCtrl::GetSelection(long* from, long* to) const
1907 {
1908     *from = m_selectionRange.GetStart();
1909     *to = m_selectionRange.GetEnd();
1910 }
1911
1912 bool wxRichTextCtrl::IsEditable() const
1913 {
1914     return m_editable;
1915 }
1916
1917 // ----------------------------------------------------------------------------
1918 // selection
1919 // ----------------------------------------------------------------------------
1920
1921 void wxRichTextCtrl::SetSelection(long from, long to)
1922 {
1923     // if from and to are both -1, it means (in wxWidgets) that all text should
1924     // be selected.
1925     if ( (from == -1) && (to == -1) )
1926     {
1927         from = 0;
1928         to = GetLastPosition();
1929     }
1930
1931     DoSetSelection(from, to);
1932 }
1933
1934 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
1935 {
1936     m_selectionAnchor = from;
1937     m_selectionRange.SetRange(from, to);
1938     Refresh(false);
1939     PositionCaret();
1940 }
1941
1942 // ----------------------------------------------------------------------------
1943 // Editing
1944 // ----------------------------------------------------------------------------
1945
1946 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to), const wxString& value)
1947 {
1948     BeginBatchUndo(_("Replace"));
1949
1950     DeleteSelectedContent();
1951
1952     DoWriteText(value, true /* selection only */);
1953
1954     EndBatchUndo();
1955 }
1956
1957 void wxRichTextCtrl::Remove(long from, long to)
1958 {
1959     SelectNone();
1960
1961     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to),
1962         m_caretPosition,       // Current caret position
1963         from,                           // New caret position
1964         this);
1965
1966     LayoutContent();
1967     if (!IsFrozen())
1968         Refresh(false);
1969 }
1970
1971 bool wxRichTextCtrl::IsModified() const
1972 {
1973     return m_buffer.IsModified();
1974 }
1975
1976 void wxRichTextCtrl::MarkDirty()
1977 {
1978     m_buffer.Modify(true);
1979 }
1980
1981 void wxRichTextCtrl::DiscardEdits()
1982 {
1983     m_caretPositionForDefaultStyle = -2;
1984     m_buffer.Modify(false);
1985     m_buffer.GetCommandProcessor()->ClearCommands();
1986 }
1987
1988 int wxRichTextCtrl::GetNumberOfLines() const
1989 {
1990     return GetBuffer().GetParagraphCount();
1991 }
1992
1993 // ----------------------------------------------------------------------------
1994 // Positions <-> coords
1995 // ----------------------------------------------------------------------------
1996
1997 long wxRichTextCtrl::XYToPosition(long x, long y) const
1998 {
1999     return GetBuffer().XYToPosition(x, y);
2000 }
2001
2002 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2003 {
2004     return GetBuffer().PositionToXY(pos, x, y);
2005 }
2006
2007 // ----------------------------------------------------------------------------
2008 //
2009 // ----------------------------------------------------------------------------
2010
2011 void wxRichTextCtrl::ShowPosition(long pos)
2012 {
2013     if (!IsPositionVisible(pos))
2014         ScrollIntoView(pos-1, WXK_DOWN);
2015 }
2016
2017 int wxRichTextCtrl::GetLineLength(long lineNo) const
2018 {
2019     return GetBuffer().GetParagraphLength(lineNo);
2020 }
2021
2022 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2023 {
2024     return GetBuffer().GetParagraphText(lineNo);
2025 }
2026
2027 // ----------------------------------------------------------------------------
2028 // Undo/redo
2029 // ----------------------------------------------------------------------------
2030
2031 void wxRichTextCtrl::Undo()
2032 {
2033     if (CanUndo())
2034     {
2035         GetCommandProcessor()->Undo();
2036     }
2037 }
2038
2039 void wxRichTextCtrl::Redo()
2040 {
2041     if (CanRedo())
2042     {
2043         GetCommandProcessor()->Redo();
2044     }
2045 }
2046
2047 bool wxRichTextCtrl::CanUndo() const
2048 {
2049     return GetCommandProcessor()->CanUndo();
2050 }
2051
2052 bool wxRichTextCtrl::CanRedo() const
2053 {
2054     return GetCommandProcessor()->CanRedo();
2055 }
2056
2057 // ----------------------------------------------------------------------------
2058 // implementation details
2059 // ----------------------------------------------------------------------------
2060
2061 void wxRichTextCtrl::Command(wxCommandEvent& event)
2062 {
2063     SetValue(event.GetString());
2064     GetEventHandler()->ProcessEvent(event);
2065 }
2066
2067 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2068 {
2069     // By default, load the first file into the text window.
2070     if (event.GetNumberOfFiles() > 0)
2071     {
2072         LoadFile(event.GetFiles()[0]);
2073     }
2074 }
2075
2076 // ----------------------------------------------------------------------------
2077 // text control event processing
2078 // ----------------------------------------------------------------------------
2079
2080 bool wxRichTextCtrl::SendUpdateEvent()
2081 {
2082     wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
2083     InitCommandEvent(event);
2084
2085     return GetEventHandler()->ProcessEvent(event);
2086 }
2087
2088 void wxRichTextCtrl::InitCommandEvent(wxCommandEvent& event) const
2089 {
2090     event.SetEventObject((wxControlBase *)this);    // const_cast
2091
2092     switch ( m_clientDataType )
2093     {
2094         case wxClientData_Void:
2095             event.SetClientData(GetClientData());
2096             break;
2097
2098         case wxClientData_Object:
2099             event.SetClientObject(GetClientObject());
2100             break;
2101
2102         case wxClientData_None:
2103             // nothing to do
2104             ;
2105     }
2106 }
2107
2108
2109 wxSize wxRichTextCtrl::DoGetBestSize() const
2110 {
2111     return wxSize(10, 10);
2112 }
2113
2114 // ----------------------------------------------------------------------------
2115 // standard handlers for standard edit menu events
2116 // ----------------------------------------------------------------------------
2117
2118 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2119 {
2120     Cut();
2121 }
2122
2123 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2124 {
2125     DeleteSelection();
2126 }
2127
2128 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2129 {
2130     Copy();
2131 }
2132
2133 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2134 {
2135     Paste();
2136 }
2137
2138 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2139 {
2140     Undo();
2141 }
2142
2143 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2144 {
2145     Redo();
2146 }
2147
2148 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2149 {
2150     event.Enable( CanCut() );
2151 }
2152
2153 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2154 {
2155     event.Enable( CanCopy() );
2156 }
2157
2158 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2159 {
2160     event.Enable( CanDeleteSelection() );
2161 }
2162
2163 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2164 {
2165     event.Enable( CanPaste() );
2166 }
2167
2168 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2169 {
2170     event.Enable( CanUndo() );
2171     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2172 }
2173
2174 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2175 {
2176     event.Enable( CanRedo() );
2177     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2178 }
2179
2180 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2181 {
2182     SelectAll();
2183 }
2184
2185 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2186 {
2187     event.Enable(GetLastPosition() > 0);
2188 }
2189
2190 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& WXUNUSED(event))
2191 {
2192     if (!m_contextMenu)
2193     {
2194         m_contextMenu = new wxMenu;
2195         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2196         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2197         m_contextMenu->AppendSeparator();
2198         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2199         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2200         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2201         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2202         m_contextMenu->AppendSeparator();
2203         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2204     }
2205     PopupMenu(m_contextMenu);
2206     return;
2207 }
2208
2209 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttrEx& style)
2210 {
2211     return GetBuffer().SetStyle(wxRichTextRange(start, end), style);
2212 }
2213
2214 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2215 {
2216     return GetBuffer().SetStyle(wxRichTextRange(start, end), wxTextAttrEx(style));
2217 }
2218
2219 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxRichTextAttr& style)
2220 {
2221     return GetBuffer().SetStyle(range, style);
2222 }
2223
2224 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttrEx& style)
2225 {
2226     return GetBuffer().SetDefaultStyle(style);
2227 }
2228
2229 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2230 {
2231     return GetBuffer().SetDefaultStyle(wxTextAttrEx(style));
2232 }
2233
2234 const wxTextAttrEx& wxRichTextCtrl::GetDefaultStyleEx() const
2235 {
2236     return GetBuffer().GetDefaultStyle();
2237 }
2238
2239 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2240 {
2241     return GetBuffer().GetDefaultStyle();
2242 }
2243
2244 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style) const
2245 {
2246     wxTextAttrEx attr;
2247     if (GetBuffer().GetStyle(position, attr))
2248     {
2249         style = attr;
2250         return true;
2251     }
2252     else
2253         return false;
2254 }
2255
2256 bool wxRichTextCtrl::GetStyle(long position, wxTextAttrEx& style) const
2257 {
2258     return GetBuffer().GetStyle(position, style);
2259 }
2260
2261 bool wxRichTextCtrl::GetStyle(long position, wxRichTextAttr& style) const
2262 {
2263     return GetBuffer().GetStyle(position, style);
2264 }
2265
2266 /// Set font, and also the buffer attributes
2267 bool wxRichTextCtrl::SetFont(const wxFont& font)
2268 {
2269 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
2270     wxControl::SetFont(font);
2271 #else
2272     wxScrolledWindow::SetFont(font);
2273 #endif
2274
2275     wxTextAttrEx attr = GetBuffer().GetAttributes();
2276     attr.SetFont(font);
2277     GetBuffer().SetBasicStyle(attr);
2278     GetBuffer().SetDefaultStyle(attr);
2279
2280     return true;
2281 }
2282
2283 /// Transform logical to physical
2284 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2285 {
2286     wxPoint pt;
2287     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2288
2289     return pt;
2290 }
2291
2292 /// Transform physical to logical
2293 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2294 {
2295     wxPoint pt;
2296     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2297
2298     return pt;
2299 }
2300
2301 /// Position the caret
2302 void wxRichTextCtrl::PositionCaret()
2303 {
2304     if (!GetCaret())
2305         return;
2306
2307     //wxLogDebug(wxT("PositionCaret"));
2308
2309     wxRect caretRect;
2310     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2311     {
2312         wxPoint originalPt = caretRect.GetPosition();
2313         wxPoint pt = GetPhysicalPoint(originalPt);
2314         if (GetCaret()->GetPosition() != pt)
2315         {
2316             GetCaret()->Move(pt);
2317             GetCaret()->SetSize(caretRect.GetSize());
2318         }
2319     }
2320 }
2321
2322 /// Get the caret height and position for the given character position
2323 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2324 {
2325     wxClientDC dc(this);
2326     dc.SetFont(GetFont());
2327
2328     PrepareDC(dc);
2329
2330     wxPoint pt;
2331     int height = 0;
2332
2333     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2334     {
2335         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2336         return true;
2337     }
2338
2339     return false;
2340 }
2341
2342 /// Gets the line for the visible caret position. If the caret is
2343 /// shown at the very end of the line, it means the next character is actually
2344 /// on the following line. So let's get the line we're expecting to find
2345 /// if this is the case.
2346 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2347 {
2348     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2349     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2350     if (line)
2351     {
2352         wxRichTextRange lineRange = line->GetAbsoluteRange();
2353         if (caretPosition == lineRange.GetStart()-1 &&
2354             (para->GetRange().GetStart() != lineRange.GetStart()))
2355         {
2356             if (!m_caretAtLineStart)
2357                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2358         }
2359     }
2360     return line;
2361 }
2362
2363
2364 /// Move the caret to the given character position
2365 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2366 {
2367     if (GetBuffer().GetDirty())
2368         LayoutContent();
2369
2370     if (pos <= GetBuffer().GetRange().GetEnd())
2371     {
2372         SetCaretPosition(pos, showAtLineStart);
2373
2374         PositionCaret();
2375
2376         return true;
2377     }
2378     else
2379         return false;
2380 }
2381
2382 /// Layout the buffer: which we must do before certain operations, such as
2383 /// setting the caret position.
2384 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2385 {
2386     if (GetBuffer().GetDirty() || onlyVisibleRect)
2387     {
2388         wxRect availableSpace(GetClientSize());
2389         if (availableSpace.width == 0)
2390             availableSpace.width = 10;
2391         if (availableSpace.height == 0)
2392             availableSpace.height = 10;
2393
2394         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2395         if (onlyVisibleRect)
2396         {
2397             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2398             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2399         }
2400
2401         wxClientDC dc(this);
2402         dc.SetFont(GetFont());
2403
2404         PrepareDC(dc);
2405
2406         GetBuffer().Defragment();
2407         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2408         GetBuffer().Layout(dc, availableSpace, flags);
2409         GetBuffer().SetDirty(false);
2410
2411         if (!IsFrozen())
2412             SetupScrollbars();
2413     }
2414
2415     return true;
2416 }
2417
2418 /// Is all of the selection bold?
2419 bool wxRichTextCtrl::IsSelectionBold() const
2420 {
2421     if (HasSelection())
2422     {
2423         wxRichTextAttr attr;
2424         wxRichTextRange range = GetSelectionRange();
2425         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2426         attr.SetFontWeight(wxBOLD);
2427
2428         return HasCharacterAttributes(range, attr);
2429     }
2430     else
2431     {
2432         // If no selection, then we need to combine current style with default style
2433         // to see what the effect would be if we started typing.
2434         wxRichTextAttr attr;
2435         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2436
2437         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2438         if (GetStyle(pos, attr))
2439         {
2440             if (IsDefaultStyleShowing())
2441                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2442             return attr.GetFontWeight() == wxBOLD;
2443         }
2444     }
2445     return false;
2446 }
2447
2448 /// Is all of the selection italics?
2449 bool wxRichTextCtrl::IsSelectionItalics() const
2450 {
2451     if (HasSelection())
2452     {
2453         wxRichTextRange range = GetSelectionRange();
2454         wxRichTextAttr attr;
2455         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2456         attr.SetFontStyle(wxITALIC);
2457
2458         return HasCharacterAttributes(range, attr);
2459     }
2460     else
2461     {
2462         // If no selection, then we need to combine current style with default style
2463         // to see what the effect would be if we started typing.
2464         wxRichTextAttr attr;
2465         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2466
2467         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2468         if (GetStyle(pos, attr))
2469         {
2470             if (IsDefaultStyleShowing())
2471                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2472             return attr.GetFontStyle() == wxITALIC;
2473         }
2474     }
2475     return false;
2476 }
2477
2478 /// Is all of the selection underlined?
2479 bool wxRichTextCtrl::IsSelectionUnderlined() const
2480 {
2481     if (HasSelection())
2482     {
2483         wxRichTextRange range = GetSelectionRange();
2484         wxRichTextAttr attr;
2485         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2486         attr.SetFontUnderlined(true);
2487
2488         return HasCharacterAttributes(range, attr);
2489     }
2490     else
2491     {
2492         // If no selection, then we need to combine current style with default style
2493         // to see what the effect would be if we started typing.
2494         wxRichTextAttr attr;
2495         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2496
2497         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2498         if (GetStyle(pos, attr))
2499         {
2500             if (IsDefaultStyleShowing())
2501                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2502             return attr.GetFontUnderlined();
2503         }
2504     }
2505     return false;
2506 }
2507
2508 /// Apply bold to the selection
2509 bool wxRichTextCtrl::ApplyBoldToSelection()
2510 {
2511     wxRichTextAttr attr;
2512     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2513     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2514
2515     if (HasSelection())
2516         return SetStyle(GetSelectionRange(), attr);
2517     else
2518         SetAndShowDefaultStyle(attr);
2519     return true;
2520 }
2521
2522 /// Apply italic to the selection
2523 bool wxRichTextCtrl::ApplyItalicToSelection()
2524 {
2525     wxRichTextAttr attr;
2526     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2527     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2528
2529     if (HasSelection())
2530         return SetStyle(GetSelectionRange(), attr);
2531     else
2532         SetAndShowDefaultStyle(attr);
2533     return true;
2534 }
2535
2536 /// Apply underline to the selection
2537 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2538 {
2539     wxRichTextAttr attr;
2540     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2541     attr.SetFontUnderlined(!IsSelectionUnderlined());
2542
2543     if (HasSelection())
2544         return SetStyle(GetSelectionRange(), attr);
2545     else
2546         SetAndShowDefaultStyle(attr);
2547     return true;
2548 }
2549
2550 /// Is all of the selection aligned according to the specified flag?
2551 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment) const
2552 {
2553     if (HasSelection())
2554     {
2555         wxRichTextRange range = GetSelectionRange();
2556         wxRichTextAttr attr;
2557         attr.SetAlignment(alignment);
2558
2559         return HasParagraphAttributes(range, attr);
2560     }
2561     else
2562     {
2563         // If no selection, then we need to get information from the current paragraph.
2564         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2565         if (para)
2566             return para->GetAttributes().GetAlignment() == alignment;
2567     }
2568     return false;
2569 }
2570
2571 /// Apply alignment to the selection
2572 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2573 {
2574     wxRichTextAttr attr;
2575     attr.SetAlignment(alignment);
2576     if (HasSelection())
2577         return SetStyle(GetSelectionRange(), attr);
2578     else
2579     {
2580         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2581         if (para)
2582             return SetStyle(para->GetRange(), attr);
2583     }
2584     return true;
2585 }
2586
2587 /// Apply a named style to the selection
2588 void wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
2589 {
2590     // Flags are defined within each definition, so only certain
2591     // attributes are applied.
2592     wxRichTextAttr attr(def->GetStyle());
2593
2594     // Make sure the attr has the style name
2595     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
2596         attr.SetParagraphStyleName(def->GetName());
2597     else
2598         attr.SetCharacterStyleName(def->GetName());
2599
2600     if (HasSelection())
2601         SetStyle(GetSelectionRange(), attr);
2602     else
2603         SetAndShowDefaultStyle(attr);
2604 }
2605
2606 /// Sets the default style to the style under the cursor
2607 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
2608 {
2609     wxTextAttrEx attr;
2610     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
2611
2612     // If at the start of a paragraph, use the next position.
2613     long pos = GetAdjustedCaretPosition(GetCaretPosition());
2614
2615     if (GetStyle(pos, attr))
2616     {
2617         SetDefaultStyle(attr);
2618         return true;
2619     }
2620
2621     return false;
2622 }
2623
2624 /// Returns the first visible position in the current view
2625 long wxRichTextCtrl::GetFirstVisiblePosition() const
2626 {
2627     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
2628     if (line)
2629         return line->GetAbsoluteRange().GetStart();
2630     else
2631         return 0;
2632 }
2633
2634 /// The adjusted caret position is the character position adjusted to take
2635 /// into account whether we're at the start of a paragraph, in which case
2636 /// style information should be taken from the next position, not current one.
2637 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
2638 {
2639     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
2640
2641     if (para && (caretPos+1 == para->GetRange().GetStart()))
2642         caretPos ++;
2643     return caretPos;
2644 }
2645
2646 #endif
2647     // wxUSE_RICHTEXT