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(), GetInternalSelectionRange(), 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()+1);
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     // Public API for range is different from internals
1697     return GetBuffer().GetTextForRange(wxRichTextRange(from, to-1));
1698 }
1699
1700 void wxRichTextCtrl::SetValue(const wxString& value)
1701 {
1702     Clear();
1703
1704     // if the text is long enough, it's faster to just set it instead of first
1705     // comparing it with the old one (chances are that it will be different
1706     // anyhow, this comparison is there to avoid flicker for small single-line
1707     // edit controls mostly)
1708     if ( (value.length() > 0x400) || (value != GetValue()) )
1709     {
1710         DoWriteText(value, false /* not selection only */);
1711
1712         // for compatibility, don't move the cursor when doing SetValue()
1713         SetInsertionPoint(0);
1714     }
1715     else // same text
1716     {
1717         // still send an event for consistency
1718         SendUpdateEvent();
1719     }
1720
1721     // we should reset the modified flag even if the value didn't really change
1722
1723     // mark the control as being not dirty - we changed its text, not the
1724     // user
1725     DiscardEdits();
1726 }
1727
1728 void wxRichTextCtrl::WriteText(const wxString& value)
1729 {
1730     DoWriteText(value);
1731 }
1732
1733 void wxRichTextCtrl::DoWriteText(const wxString& value, bool WXUNUSED(selectionOnly))
1734 {
1735     GetBuffer().InsertTextWithUndo(m_caretPosition+1, value, this);
1736 }
1737
1738 void wxRichTextCtrl::AppendText(const wxString& text)
1739 {
1740     SetInsertionPointEnd();
1741
1742     WriteText(text);
1743 }
1744
1745 /// Write an image at the current insertion point
1746 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
1747 {
1748     wxRichTextImageBlock imageBlock;
1749
1750     wxImage image2 = image;
1751     if (imageBlock.MakeImageBlock(image2, bitmapType))
1752         return WriteImage(imageBlock);
1753
1754     return false;
1755 }
1756
1757 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
1758 {
1759     wxRichTextImageBlock imageBlock;
1760
1761     wxImage image;
1762     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
1763         return WriteImage(imageBlock);
1764
1765     return false;
1766 }
1767
1768 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
1769 {
1770     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
1771 }
1772
1773 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
1774 {
1775     if (bitmap.Ok())
1776     {
1777         wxRichTextImageBlock imageBlock;
1778
1779         wxImage image = bitmap.ConvertToImage();
1780         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
1781             return WriteImage(imageBlock);
1782     }
1783
1784     return false;
1785 }
1786
1787 /// Insert a newline (actually paragraph) at the current insertion point.
1788 bool wxRichTextCtrl::Newline()
1789 {
1790     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
1791 }
1792
1793
1794 // ----------------------------------------------------------------------------
1795 // Clipboard operations
1796 // ----------------------------------------------------------------------------
1797
1798 void wxRichTextCtrl::Copy()
1799 {
1800     if (CanCopy())
1801     {
1802         wxRichTextRange range = GetSelectionRange();
1803         GetBuffer().CopyToClipboard(range);
1804     }
1805 }
1806
1807 void wxRichTextCtrl::Cut()
1808 {
1809     if (CanCut())
1810     {
1811         wxRichTextRange range = GetSelectionRange();
1812         GetBuffer().CopyToClipboard(range);
1813
1814         DeleteSelectedContent();
1815         LayoutContent();
1816         Refresh(false);
1817     }
1818 }
1819
1820 void wxRichTextCtrl::Paste()
1821 {
1822     if (CanPaste())
1823     {
1824         BeginBatchUndo(_("Paste"));
1825
1826         long newPos = m_caretPosition;
1827         DeleteSelectedContent(& newPos);
1828
1829         GetBuffer().PasteFromClipboard(newPos);
1830
1831         EndBatchUndo();
1832     }
1833 }
1834
1835 void wxRichTextCtrl::DeleteSelection()
1836 {
1837     if (CanDeleteSelection())
1838     {
1839         DeleteSelectedContent();
1840     }
1841 }
1842
1843 bool wxRichTextCtrl::HasSelection() const
1844 {
1845     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
1846 }
1847
1848 bool wxRichTextCtrl::CanCopy() const
1849 {
1850     // Can copy if there's a selection
1851     return HasSelection();
1852 }
1853
1854 bool wxRichTextCtrl::CanCut() const
1855 {
1856     return HasSelection() && IsEditable();
1857 }
1858
1859 bool wxRichTextCtrl::CanPaste() const
1860 {
1861     if ( !IsEditable() )
1862         return false;
1863
1864     return GetBuffer().CanPasteFromClipboard();
1865 }
1866
1867 bool wxRichTextCtrl::CanDeleteSelection() const
1868 {
1869     return HasSelection() && IsEditable();
1870 }
1871
1872
1873 // ----------------------------------------------------------------------------
1874 // Accessors
1875 // ----------------------------------------------------------------------------
1876
1877 void wxRichTextCtrl::SetEditable(bool editable)
1878 {
1879     m_editable = editable;
1880 }
1881
1882 void wxRichTextCtrl::SetInsertionPoint(long pos)
1883 {
1884     SelectNone();
1885
1886     m_caretPosition = pos - 1;
1887 }
1888
1889 void wxRichTextCtrl::SetInsertionPointEnd()
1890 {
1891     long pos = GetLastPosition();
1892     SetInsertionPoint(pos);
1893 }
1894
1895 long wxRichTextCtrl::GetInsertionPoint() const
1896 {
1897     return m_caretPosition+1;
1898 }
1899
1900 wxTextPos wxRichTextCtrl::GetLastPosition() const
1901 {
1902     return GetBuffer().GetRange().GetEnd();
1903 }
1904
1905 // If the return values from and to are the same, there is no
1906 // selection.
1907 void wxRichTextCtrl::GetSelection(long* from, long* to) const
1908 {
1909     *from = m_selectionRange.GetStart();
1910     *to = m_selectionRange.GetEnd();
1911     if ((*to) != -1 && (*to) != -2)
1912         (*to) ++;
1913 }
1914
1915 bool wxRichTextCtrl::IsEditable() const
1916 {
1917     return m_editable;
1918 }
1919
1920 // ----------------------------------------------------------------------------
1921 // selection
1922 // ----------------------------------------------------------------------------
1923
1924 void wxRichTextCtrl::SetSelection(long from, long to)
1925 {
1926     // if from and to are both -1, it means (in wxWidgets) that all text should
1927     // be selected.
1928     if ( (from == -1) && (to == -1) )
1929     {
1930         from = 0;
1931         to = GetLastPosition()+1;
1932     }
1933
1934     DoSetSelection(from, to);
1935 }
1936
1937 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
1938 {
1939     m_selectionAnchor = from;
1940     m_selectionRange.SetRange(from, to-1);
1941     Refresh(false);
1942     PositionCaret();
1943 }
1944
1945 // ----------------------------------------------------------------------------
1946 // Editing
1947 // ----------------------------------------------------------------------------
1948
1949 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to), const wxString& value)
1950 {
1951     BeginBatchUndo(_("Replace"));
1952
1953     DeleteSelectedContent();
1954
1955     DoWriteText(value, true /* selection only */);
1956
1957     EndBatchUndo();
1958 }
1959
1960 void wxRichTextCtrl::Remove(long from, long to)
1961 {
1962     SelectNone();
1963
1964     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to),
1965         m_caretPosition,       // Current caret position
1966         from,                           // New caret position
1967         this);
1968
1969     LayoutContent();
1970     if (!IsFrozen())
1971         Refresh(false);
1972 }
1973
1974 bool wxRichTextCtrl::IsModified() const
1975 {
1976     return m_buffer.IsModified();
1977 }
1978
1979 void wxRichTextCtrl::MarkDirty()
1980 {
1981     m_buffer.Modify(true);
1982 }
1983
1984 void wxRichTextCtrl::DiscardEdits()
1985 {
1986     m_caretPositionForDefaultStyle = -2;
1987     m_buffer.Modify(false);
1988     m_buffer.GetCommandProcessor()->ClearCommands();
1989 }
1990
1991 int wxRichTextCtrl::GetNumberOfLines() const
1992 {
1993     return GetBuffer().GetParagraphCount();
1994 }
1995
1996 // ----------------------------------------------------------------------------
1997 // Positions <-> coords
1998 // ----------------------------------------------------------------------------
1999
2000 long wxRichTextCtrl::XYToPosition(long x, long y) const
2001 {
2002     return GetBuffer().XYToPosition(x, y);
2003 }
2004
2005 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
2006 {
2007     return GetBuffer().PositionToXY(pos, x, y);
2008 }
2009
2010 // ----------------------------------------------------------------------------
2011 //
2012 // ----------------------------------------------------------------------------
2013
2014 void wxRichTextCtrl::ShowPosition(long pos)
2015 {
2016     if (!IsPositionVisible(pos))
2017         ScrollIntoView(pos-1, WXK_DOWN);
2018 }
2019
2020 int wxRichTextCtrl::GetLineLength(long lineNo) const
2021 {
2022     return GetBuffer().GetParagraphLength(lineNo);
2023 }
2024
2025 wxString wxRichTextCtrl::GetLineText(long lineNo) const
2026 {
2027     return GetBuffer().GetParagraphText(lineNo);
2028 }
2029
2030 // ----------------------------------------------------------------------------
2031 // Undo/redo
2032 // ----------------------------------------------------------------------------
2033
2034 void wxRichTextCtrl::Undo()
2035 {
2036     if (CanUndo())
2037     {
2038         GetCommandProcessor()->Undo();
2039     }
2040 }
2041
2042 void wxRichTextCtrl::Redo()
2043 {
2044     if (CanRedo())
2045     {
2046         GetCommandProcessor()->Redo();
2047     }
2048 }
2049
2050 bool wxRichTextCtrl::CanUndo() const
2051 {
2052     return GetCommandProcessor()->CanUndo();
2053 }
2054
2055 bool wxRichTextCtrl::CanRedo() const
2056 {
2057     return GetCommandProcessor()->CanRedo();
2058 }
2059
2060 // ----------------------------------------------------------------------------
2061 // implementation details
2062 // ----------------------------------------------------------------------------
2063
2064 void wxRichTextCtrl::Command(wxCommandEvent& event)
2065 {
2066     SetValue(event.GetString());
2067     GetEventHandler()->ProcessEvent(event);
2068 }
2069
2070 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2071 {
2072     // By default, load the first file into the text window.
2073     if (event.GetNumberOfFiles() > 0)
2074     {
2075         LoadFile(event.GetFiles()[0]);
2076     }
2077 }
2078
2079 // ----------------------------------------------------------------------------
2080 // text control event processing
2081 // ----------------------------------------------------------------------------
2082
2083 bool wxRichTextCtrl::SendUpdateEvent()
2084 {
2085     wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
2086     InitCommandEvent(event);
2087
2088     return GetEventHandler()->ProcessEvent(event);
2089 }
2090
2091 void wxRichTextCtrl::InitCommandEvent(wxCommandEvent& event) const
2092 {
2093     event.SetEventObject((wxControlBase *)this);    // const_cast
2094
2095     switch ( m_clientDataType )
2096     {
2097         case wxClientData_Void:
2098             event.SetClientData(GetClientData());
2099             break;
2100
2101         case wxClientData_Object:
2102             event.SetClientObject(GetClientObject());
2103             break;
2104
2105         case wxClientData_None:
2106             // nothing to do
2107             ;
2108     }
2109 }
2110
2111
2112 wxSize wxRichTextCtrl::DoGetBestSize() const
2113 {
2114     return wxSize(10, 10);
2115 }
2116
2117 // ----------------------------------------------------------------------------
2118 // standard handlers for standard edit menu events
2119 // ----------------------------------------------------------------------------
2120
2121 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2122 {
2123     Cut();
2124 }
2125
2126 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2127 {
2128     DeleteSelection();
2129 }
2130
2131 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2132 {
2133     Copy();
2134 }
2135
2136 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2137 {
2138     Paste();
2139 }
2140
2141 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2142 {
2143     Undo();
2144 }
2145
2146 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2147 {
2148     Redo();
2149 }
2150
2151 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2152 {
2153     event.Enable( CanCut() );
2154 }
2155
2156 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2157 {
2158     event.Enable( CanCopy() );
2159 }
2160
2161 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2162 {
2163     event.Enable( CanDeleteSelection() );
2164 }
2165
2166 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2167 {
2168     event.Enable( CanPaste() );
2169 }
2170
2171 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2172 {
2173     event.Enable( CanUndo() );
2174     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2175 }
2176
2177 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2178 {
2179     event.Enable( CanRedo() );
2180     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2181 }
2182
2183 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2184 {
2185     SelectAll();
2186 }
2187
2188 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2189 {
2190     event.Enable(GetLastPosition() > 0);
2191 }
2192
2193 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& WXUNUSED(event))
2194 {
2195     if (!m_contextMenu)
2196     {
2197         m_contextMenu = new wxMenu;
2198         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2199         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2200         m_contextMenu->AppendSeparator();
2201         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2202         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2203         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2204         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2205         m_contextMenu->AppendSeparator();
2206         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2207     }
2208     PopupMenu(m_contextMenu);
2209     return;
2210 }
2211
2212 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttrEx& style)
2213 {
2214     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), style);
2215 }
2216
2217 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttr& style)
2218 {
2219     return GetBuffer().SetStyle(wxRichTextRange(start, end-1), wxTextAttrEx(style));
2220 }
2221
2222 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxRichTextAttr& style)
2223 {
2224     return GetBuffer().SetStyle(range.ToInternal(), style);
2225 }
2226
2227 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttrEx& style)
2228 {
2229     return GetBuffer().SetDefaultStyle(style);
2230 }
2231
2232 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttr& style)
2233 {
2234     return GetBuffer().SetDefaultStyle(wxTextAttrEx(style));
2235 }
2236
2237 const wxTextAttrEx& wxRichTextCtrl::GetDefaultStyleEx() const
2238 {
2239     return GetBuffer().GetDefaultStyle();
2240 }
2241
2242 const wxTextAttr& wxRichTextCtrl::GetDefaultStyle() const
2243 {
2244     return GetBuffer().GetDefaultStyle();
2245 }
2246
2247 bool wxRichTextCtrl::GetStyle(long position, wxTextAttr& style)
2248 {
2249     wxTextAttrEx attr;
2250     if (GetBuffer().GetStyle(position, attr))
2251     {
2252         style = attr;
2253         return true;
2254     }
2255     else
2256         return false;
2257 }
2258
2259 bool wxRichTextCtrl::GetStyle(long position, wxTextAttrEx& style)
2260 {
2261     return GetBuffer().GetStyle(position, style);
2262 }
2263
2264 bool wxRichTextCtrl::GetStyle(long position, wxRichTextAttr& style)
2265 {
2266     return GetBuffer().GetStyle(position, style);
2267 }
2268
2269 /// Set font, and also the buffer attributes
2270 bool wxRichTextCtrl::SetFont(const wxFont& font)
2271 {
2272 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
2273     wxControl::SetFont(font);
2274 #else
2275     wxScrolledWindow::SetFont(font);
2276 #endif
2277
2278     wxTextAttrEx attr = GetBuffer().GetAttributes();
2279     attr.SetFont(font);
2280     GetBuffer().SetBasicStyle(attr);
2281     GetBuffer().SetDefaultStyle(attr);
2282
2283     return true;
2284 }
2285
2286 /// Transform logical to physical
2287 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2288 {
2289     wxPoint pt;
2290     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2291
2292     return pt;
2293 }
2294
2295 /// Transform physical to logical
2296 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2297 {
2298     wxPoint pt;
2299     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2300
2301     return pt;
2302 }
2303
2304 /// Position the caret
2305 void wxRichTextCtrl::PositionCaret()
2306 {
2307     if (!GetCaret())
2308         return;
2309
2310     //wxLogDebug(wxT("PositionCaret"));
2311
2312     wxRect caretRect;
2313     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2314     {
2315         wxPoint originalPt = caretRect.GetPosition();
2316         wxPoint pt = GetPhysicalPoint(originalPt);
2317         if (GetCaret()->GetPosition() != pt)
2318         {
2319             GetCaret()->Move(pt);
2320             GetCaret()->SetSize(caretRect.GetSize());
2321         }
2322     }
2323 }
2324
2325 /// Get the caret height and position for the given character position
2326 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2327 {
2328     wxClientDC dc(this);
2329     dc.SetFont(GetFont());
2330
2331     PrepareDC(dc);
2332
2333     wxPoint pt;
2334     int height = 0;
2335
2336     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2337     {
2338         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2339         return true;
2340     }
2341
2342     return false;
2343 }
2344
2345 /// Gets the line for the visible caret position. If the caret is
2346 /// shown at the very end of the line, it means the next character is actually
2347 /// on the following line. So let's get the line we're expecting to find
2348 /// if this is the case.
2349 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2350 {
2351     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2352     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2353     if (line)
2354     {
2355         wxRichTextRange lineRange = line->GetAbsoluteRange();
2356         if (caretPosition == lineRange.GetStart()-1 &&
2357             (para->GetRange().GetStart() != lineRange.GetStart()))
2358         {
2359             if (!m_caretAtLineStart)
2360                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2361         }
2362     }
2363     return line;
2364 }
2365
2366
2367 /// Move the caret to the given character position
2368 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2369 {
2370     if (GetBuffer().GetDirty())
2371         LayoutContent();
2372
2373     if (pos <= GetBuffer().GetRange().GetEnd())
2374     {
2375         SetCaretPosition(pos, showAtLineStart);
2376
2377         PositionCaret();
2378
2379         return true;
2380     }
2381     else
2382         return false;
2383 }
2384
2385 /// Layout the buffer: which we must do before certain operations, such as
2386 /// setting the caret position.
2387 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2388 {
2389     if (GetBuffer().GetDirty() || onlyVisibleRect)
2390     {
2391         wxRect availableSpace(GetClientSize());
2392         if (availableSpace.width == 0)
2393             availableSpace.width = 10;
2394         if (availableSpace.height == 0)
2395             availableSpace.height = 10;
2396
2397         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2398         if (onlyVisibleRect)
2399         {
2400             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2401             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2402         }
2403
2404         wxClientDC dc(this);
2405         dc.SetFont(GetFont());
2406
2407         PrepareDC(dc);
2408
2409         GetBuffer().Defragment();
2410         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2411         GetBuffer().Layout(dc, availableSpace, flags);
2412         GetBuffer().SetDirty(false);
2413
2414         if (!IsFrozen())
2415             SetupScrollbars();
2416     }
2417
2418     return true;
2419 }
2420
2421 /// Is all of the selection bold?
2422 bool wxRichTextCtrl::IsSelectionBold()
2423 {
2424     if (HasSelection())
2425     {
2426         wxRichTextAttr attr;
2427         wxRichTextRange range = GetInternalSelectionRange();
2428         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2429         attr.SetFontWeight(wxBOLD);
2430
2431         return HasCharacterAttributes(range, attr);
2432     }
2433     else
2434     {
2435         // If no selection, then we need to combine current style with default style
2436         // to see what the effect would be if we started typing.
2437         wxRichTextAttr attr;
2438         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2439
2440         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2441         if (GetStyle(pos, attr))
2442         {
2443             if (IsDefaultStyleShowing())
2444                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2445             return attr.GetFontWeight() == wxBOLD;
2446         }
2447     }
2448     return false;
2449 }
2450
2451 /// Is all of the selection italics?
2452 bool wxRichTextCtrl::IsSelectionItalics()
2453 {
2454     if (HasSelection())
2455     {
2456         wxRichTextRange range = GetInternalSelectionRange();
2457         wxRichTextAttr attr;
2458         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2459         attr.SetFontStyle(wxITALIC);
2460
2461         return HasCharacterAttributes(range, attr);
2462     }
2463     else
2464     {
2465         // If no selection, then we need to combine current style with default style
2466         // to see what the effect would be if we started typing.
2467         wxRichTextAttr attr;
2468         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2469
2470         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2471         if (GetStyle(pos, attr))
2472         {
2473             if (IsDefaultStyleShowing())
2474                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2475             return attr.GetFontStyle() == wxITALIC;
2476         }
2477     }
2478     return false;
2479 }
2480
2481 /// Is all of the selection underlined?
2482 bool wxRichTextCtrl::IsSelectionUnderlined()
2483 {
2484     if (HasSelection())
2485     {
2486         wxRichTextRange range = GetInternalSelectionRange();
2487         wxRichTextAttr attr;
2488         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2489         attr.SetFontUnderlined(true);
2490
2491         return HasCharacterAttributes(range, attr);
2492     }
2493     else
2494     {
2495         // If no selection, then we need to combine current style with default style
2496         // to see what the effect would be if we started typing.
2497         wxRichTextAttr attr;
2498         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2499
2500         long pos = GetAdjustedCaretPosition(GetCaretPosition());
2501         if (GetStyle(pos, attr))
2502         {
2503             if (IsDefaultStyleShowing())
2504                 wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2505             return attr.GetFontUnderlined();
2506         }
2507     }
2508     return false;
2509 }
2510
2511 /// Apply bold to the selection
2512 bool wxRichTextCtrl::ApplyBoldToSelection()
2513 {
2514     wxRichTextAttr attr;
2515     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2516     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2517
2518     if (HasSelection())
2519         return SetStyle(GetSelectionRange(), attr);
2520     else
2521         SetAndShowDefaultStyle(attr);
2522     return true;
2523 }
2524
2525 /// Apply italic to the selection
2526 bool wxRichTextCtrl::ApplyItalicToSelection()
2527 {
2528     wxRichTextAttr attr;
2529     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2530     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2531
2532     if (HasSelection())
2533         return SetStyle(GetSelectionRange(), attr);
2534     else
2535         SetAndShowDefaultStyle(attr);
2536     return true;
2537 }
2538
2539 /// Apply underline to the selection
2540 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2541 {
2542     wxRichTextAttr attr;
2543     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2544     attr.SetFontUnderlined(!IsSelectionUnderlined());
2545
2546     if (HasSelection())
2547         return SetStyle(GetSelectionRange(), attr);
2548     else
2549         SetAndShowDefaultStyle(attr);
2550     return true;
2551 }
2552
2553 /// Is all of the selection aligned according to the specified flag?
2554 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment)
2555 {
2556     if (HasSelection())
2557     {
2558         wxRichTextRange range = GetInternalSelectionRange();
2559         wxRichTextAttr attr;
2560         attr.SetAlignment(alignment);
2561
2562         return HasParagraphAttributes(range, attr);
2563     }
2564     else
2565     {
2566         // If no selection, then we need to get information from the current paragraph.
2567         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2568         if (para)
2569             return para->GetAttributes().GetAlignment() == alignment;
2570     }
2571     return false;
2572 }
2573
2574 /// Apply alignment to the selection
2575 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2576 {
2577     wxRichTextAttr attr;
2578     attr.SetAlignment(alignment);
2579     if (HasSelection())
2580         return SetStyle(GetSelectionRange(), attr);
2581     else
2582     {
2583         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2584         if (para)
2585             return SetStyle(para->GetRange().FromInternal(), attr);
2586     }
2587     return true;
2588 }
2589
2590 /// Apply a named style to the selection
2591 void wxRichTextCtrl::ApplyStyle(wxRichTextStyleDefinition* def)
2592 {
2593     // Flags are defined within each definition, so only certain
2594     // attributes are applied.
2595     wxRichTextAttr attr(def->GetStyle());
2596
2597     // Make sure the attr has the style name
2598     if (def->IsKindOf(CLASSINFO(wxRichTextParagraphStyleDefinition)))
2599         attr.SetParagraphStyleName(def->GetName());
2600     else
2601         attr.SetCharacterStyleName(def->GetName());
2602
2603     if (HasSelection())
2604         SetStyle(GetSelectionRange(), attr);
2605     else
2606         SetAndShowDefaultStyle(attr);
2607 }
2608
2609 /// Sets the default style to the style under the cursor
2610 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
2611 {
2612     wxTextAttrEx attr;
2613     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
2614
2615     // If at the start of a paragraph, use the next position.
2616     long pos = GetAdjustedCaretPosition(GetCaretPosition());
2617
2618     if (GetStyle(pos, attr))
2619     {
2620         SetDefaultStyle(attr);
2621         return true;
2622     }
2623
2624     return false;
2625 }
2626
2627 /// Returns the first visible position in the current view
2628 long wxRichTextCtrl::GetFirstVisiblePosition() const
2629 {
2630     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
2631     if (line)
2632         return line->GetAbsoluteRange().GetStart();
2633     else
2634         return 0;
2635 }
2636
2637 /// The adjusted caret position is the character position adjusted to take
2638 /// into account whether we're at the start of a paragraph, in which case
2639 /// style information should be taken from the next position, not current one.
2640 long wxRichTextCtrl::GetAdjustedCaretPosition(long caretPos) const
2641 {
2642     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPos+1);
2643
2644     if (para && (caretPos+1 == para->GetRange().GetStart()))
2645         caretPos ++;
2646     return caretPos;
2647 }
2648
2649 /// Get/set the selection range in character positions. -1, -1 means no selection.
2650 /// The range is in API convention, i.e. a single character selection is denoted
2651 /// by (n, n+1)
2652 wxRichTextRange wxRichTextCtrl::GetSelectionRange() const
2653 {
2654     wxRichTextRange range = GetInternalSelectionRange();
2655     if (range != wxRichTextRange(-2,-2) && range != wxRichTextRange(-1,-1))
2656         range.SetEnd(range.GetEnd() + 1);
2657     return range;
2658 }
2659
2660 void wxRichTextCtrl::SetSelectionRange(const wxRichTextRange& range)
2661 {
2662     wxRichTextRange range1(range);
2663     if (range1 != wxRichTextRange(-2,-2) && range1 != wxRichTextRange(-1,-1) )
2664         range1.SetEnd(range1.GetEnd() - 1);
2665
2666     wxASSERT( range1.GetStart() > range1.GetEnd() );
2667
2668     SetInternalSelectionRange(range1);
2669 }
2670
2671 #endif
2672     // wxUSE_RICHTEXT