src/richtext/richtextctrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifndef WX_PRECOMP
  20   #include "wx/wx.h"
  21 #endif
  22
  23 #include "wx/image.h"
  24
  25 #if wxUSE_RICHTEXT
  26
  27 #include "wx/textfile.h"
  28 #include "wx/ffile.h"
  29 #include "wx/settings.h"
  30 #include "wx/filename.h"
  31 #include "wx/dcbuffer.h"
  32
  33 #include "wx/richtext/richtextctrl.h"
  34 #include "wx/arrimpl.cpp"
  35
  36 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_SELECTED)
  37 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_ITEM_DESELECTED)
  38 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_CLICK)
  39 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_MIDDLE_CLICK)
  40 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RIGHT_CLICK)
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_LEFT_DCLICK)
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_RICHTEXT_RETURN)
  43
  44 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
  45 IMPLEMENT_CLASS( wxRichTextCtrl, wxControl )
  46 #else
  47 IMPLEMENT_CLASS( wxRichTextCtrl, wxScrolledWindow )
  48 #endif
  49
  50 IMPLEMENT_CLASS( wxRichTextEvent, wxNotifyEvent )
  51
  52 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
  53 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxControl )
  54 #else
  55 BEGIN_EVENT_TABLE( wxRichTextCtrl, wxScrolledWindow )
  56 #endif
  57     EVT_PAINT(wxRichTextCtrl::OnPaint)
  58     EVT_ERASE_BACKGROUND(wxRichTextCtrl::OnEraseBackground)
  59     EVT_IDLE(wxRichTextCtrl::OnIdle)
  60     EVT_SCROLLWIN(wxRichTextCtrl::OnScroll)
  61     EVT_LEFT_DOWN(wxRichTextCtrl::OnLeftClick)
  62     EVT_MOTION(wxRichTextCtrl::OnMoveMouse)
  63     EVT_LEFT_UP(wxRichTextCtrl::OnLeftUp)
  64     EVT_RIGHT_DOWN(wxRichTextCtrl::OnRightClick)
  65     EVT_MIDDLE_DOWN(wxRichTextCtrl::OnMiddleClick)
  66     EVT_LEFT_DCLICK(wxRichTextCtrl::OnLeftDClick)
  67     EVT_CHAR(wxRichTextCtrl::OnChar)
  68     EVT_SIZE(wxRichTextCtrl::OnSize)
  69     EVT_SET_FOCUS(wxRichTextCtrl::OnSetFocus)
  70     EVT_KILL_FOCUS(wxRichTextCtrl::OnKillFocus)
  71     EVT_CONTEXT_MENU(wxRichTextCtrl::OnContextMenu)
  72
  73     EVT_MENU(wxID_UNDO, wxRichTextCtrl::OnUndo)
  74     EVT_UPDATE_UI(wxID_UNDO, wxRichTextCtrl::OnUpdateUndo)
  75
  76     EVT_MENU(wxID_REDO, wxRichTextCtrl::OnRedo)
  77     EVT_UPDATE_UI(wxID_REDO, wxRichTextCtrl::OnUpdateRedo)
  78
  79     EVT_MENU(wxID_COPY, wxRichTextCtrl::OnCopy)
  80     EVT_UPDATE_UI(wxID_COPY, wxRichTextCtrl::OnUpdateCopy)
  81
  82     EVT_MENU(wxID_PASTE, wxRichTextCtrl::OnPaste)
  83     EVT_UPDATE_UI(wxID_PASTE, wxRichTextCtrl::OnUpdatePaste)
  84
  85     EVT_MENU(wxID_CUT, wxRichTextCtrl::OnCut)
  86     EVT_UPDATE_UI(wxID_CUT, wxRichTextCtrl::OnUpdateCut)
  87
  88     EVT_MENU(wxID_CLEAR, wxRichTextCtrl::OnClear)
  89     EVT_UPDATE_UI(wxID_CLEAR, wxRichTextCtrl::OnUpdateClear)
  90
  91     EVT_MENU(wxID_SELECTALL, wxRichTextCtrl::OnSelectAll)
  92     EVT_UPDATE_UI(wxID_SELECTALL, wxRichTextCtrl::OnUpdateSelectAll)
  93 END_EVENT_TABLE()
  94
  95 /*!
  96  * wxRichTextCtrl
  97  */
  98
  99 wxRichTextCtrl::wxRichTextCtrl()
 100 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 101     : wxScrollHelper(this)
 102 #endif
 103 {
 104     Init();
 105 }
 106
 107 wxRichTextCtrl::wxRichTextCtrl( wxWindow* parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style)
 108 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 109     : wxScrollHelper(this)
 110 #endif
 111 {
 112     Init();
 113     Create(parent, id, pos, size, style);
 114 }
 115
 116 /// Creation
 117 bool wxRichTextCtrl::Create( wxWindow* parent, wxWindowID id, const wxPoint& pos, const wxSize& size, long style)
 118 {
 119 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
 120     if (!wxTextCtrlBase::Create(parent, id, pos, size, style|wxFULL_REPAINT_ON_RESIZE
 121         ))
 122         return false;
 123 #else
 124     if (!wxScrolledWindow::Create(parent, id, pos, size, style|wxFULL_REPAINT_ON_RESIZE
 125         ))
 126         return false;
 127 #endif
 128
 129     if (!GetFont().Ok())
 130     {
 131         SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 132     }
 133
 134     GetBuffer().SetRichTextCtrl(this);
 135
 136     wxTextAttrEx attributes;
 137     attributes.SetFont(GetFont());
 138     attributes.SetTextColour(*wxBLACK);
 139     attributes.SetBackgroundColour(*wxWHITE);
 140     attributes.SetAlignment(wxTEXT_ALIGNMENT_LEFT);
 141     attributes.SetFlags(wxTEXT_ATTR_ALL);
 142
 143     SetDefaultStyle(attributes);
 144     SetBasicStyle(attributes);
 145
 146     SetBackgroundColour(*wxWHITE);
 147     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 148
 149     // Tell the sizers to use the given or best size
 150     SetBestFittingSize(size);
 151
 152     // Create a buffer
 153     RecreateBuffer(size);
 154
 155     SetCursor(wxCursor(wxCURSOR_IBEAM));
 156
 157     return true;
 158 }
 159
 160 wxRichTextCtrl::~wxRichTextCtrl()
 161 {
 162     delete m_contextMenu;
 163 }
 164
 165 /// Member initialisation
 166 void wxRichTextCtrl::Init()
 167 {
 168     m_freezeCount = 0;
 169     m_contextMenu = NULL;
 170     m_caret = NULL;
 171     m_caretPosition = -1;
 172     m_selectionRange.SetRange(-2, -2);
 173     m_selectionAnchor = -2;
 174     m_editable = true;
 175     m_caretAtLineStart = false;
 176     m_dragging = false;
 177     m_fullLayoutRequired = false;
 178     m_fullLayoutTime = 0;
 179     m_fullLayoutSavedPosition = 0;
 180     m_delayedLayoutThreshold = wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD;
 181 }
 182
 183 /// Call Freeze to prevent refresh
 184 void wxRichTextCtrl::Freeze()
 185 {
 186     m_freezeCount ++;
 187 }
 188
 189 /// Call Thaw to refresh
 190 void wxRichTextCtrl::Thaw(bool refresh)
 191 {
 192     m_freezeCount --;
 193
 194     if (m_freezeCount == 0 && refresh)
 195     {
 196         SetupScrollbars();
 197         Refresh();
 198     }
 199 }
 200
 201 /// Clear all text
 202 void wxRichTextCtrl::Clear()
 203 {
 204     m_buffer.Reset();
 205     m_buffer.SetDirty(true);
 206     m_caretPosition = -1;
 207     m_caretAtLineStart = false;
 208     m_selectionRange.SetRange(-2, -2);
 209
 210     if (m_freezeCount == 0)
 211     {
 212         SetupScrollbars();
 213         Refresh();
 214     }
 215     SendUpdateEvent();
 216 }
 217
 218 /// Painting
 219 void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 220 {
 221     if (GetCaret())
 222         GetCaret()->Hide();
 223
 224     {
 225         wxBufferedPaintDC dc(this, m_bufferBitmap);
 226         //wxLogDebug(wxT("OnPaint"));
 227
 228         PrepareDC(dc);
 229
 230         if (m_freezeCount > 0)
 231             return;
 232
 233         dc.SetFont(GetFont());
 234
 235         // Paint the background
 236         PaintBackground(dc);
 237
 238         wxRegion dirtyRegion = GetUpdateRegion();
 239
 240         wxRect drawingArea(GetLogicalPoint(wxPoint(0, 0)), GetClientSize());
 241         wxRect availableSpace(GetClientSize());
 242         if (GetBuffer().GetDirty())
 243         {
 244             GetBuffer().Layout(dc, availableSpace, wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT);
 245             GetBuffer().SetDirty(false);
 246             SetupScrollbars();
 247         }
 248
 249         GetBuffer().Draw(dc, GetBuffer().GetRange(), GetSelectionRange(), drawingArea, 0 /* descent */, 0 /* flags */);
 250     }
 251
 252     if (GetCaret())
 253         GetCaret()->Show();
 254
 255     PositionCaret();
 256 }
 257
 258 // Empty implementation, to prevent flicker
 259 void wxRichTextCtrl::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 260 {
 261 }
 262
 263 void wxRichTextCtrl::OnSetFocus(wxFocusEvent& WXUNUSED(event))
 264 {
 265     wxCaret* caret = new wxCaret(this, wxRICHTEXT_DEFAULT_CARET_WIDTH, 16);
 266     SetCaret(caret);
 267     caret->Show();
 268     PositionCaret();
 269
 270     if (!IsFrozen())
 271         Refresh();
 272 }
 273
 274 void wxRichTextCtrl::OnKillFocus(wxFocusEvent& WXUNUSED(event))
 275 {
 276     SetCaret(NULL);
 277
 278     if (!IsFrozen())
 279         Refresh();
 280 }
 281
 282 /// Left-click
 283 void wxRichTextCtrl::OnLeftClick(wxMouseEvent& event)
 284 {
 285     SetFocus();
 286
 287     wxClientDC dc(this);
 288     PrepareDC(dc);
 289     dc.SetFont(GetFont());
 290
 291     long position = 0;
 292     int hit = GetBuffer().HitTest(dc, event.GetLogicalPosition(dc), position);
 293
 294     if (hit != wxRICHTEXT_HITTEST_NONE)
 295     {
 296         m_dragStart = event.GetLogicalPosition(dc);
 297         m_dragging = true;
 298         CaptureMouse();
 299
 300         SelectNone();
 301
 302         bool caretAtLineStart = false;
 303
 304         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 305         {
 306             // If we're at the start of a line (but not first in para)
 307             // then we should keep the caret showing at the start of the line
 308             // by showing the m_caretAtLineStart flag.
 309             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 310             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 311
 312             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 313                 caretAtLineStart = true;
 314             position --;
 315         }
 316
 317         MoveCaret(position, caretAtLineStart);
 318         SetDefaultStyleToCursorStyle();
 319
 320 #if 0
 321         wxWindow* p = GetParent();
 322         while (p && !p->IsKindOf(CLASSINFO(wxFrame)))
 323             p = p->GetParent();
 324
 325         wxFrame* frame = wxDynamicCast(p, wxFrame);
 326         if (frame)
 327         {
 328             wxString msg = wxString::Format(wxT("Found position %ld"), position);
 329             frame->SetStatusText(msg, 1);
 330         }
 331 #endif
 332     }
 333
 334     event.Skip();
 335 }
 336
 337 /// Left-up
 338 void wxRichTextCtrl::OnLeftUp(wxMouseEvent& WXUNUSED(event))
 339 {
 340     if (m_dragging)
 341     {
 342         m_dragging = false;
 343         if (GetCapture() == this)
 344             ReleaseMouse();
 345     }
 346 }
 347
 348 /// Left-click
 349 void wxRichTextCtrl::OnMoveMouse(wxMouseEvent& event)
 350 {
 351     if (!event.Dragging())
 352     {
 353         event.Skip();
 354         return;
 355     }
 356
 357     wxClientDC dc(this);
 358     PrepareDC(dc);
 359     dc.SetFont(GetFont());
 360
 361     long position = 0;
 362     wxPoint logicalPt = event.GetLogicalPosition(dc);
 363     int hit = GetBuffer().HitTest(dc, logicalPt, position);
 364
 365     if (m_dragging && hit != wxRICHTEXT_HITTEST_NONE)
 366     {
 367         // TODO: test closeness
 368
 369         bool caretAtLineStart = false;
 370
 371         if (hit & wxRICHTEXT_HITTEST_BEFORE)
 372         {
 373             // If we're at the start of a line (but not first in para)
 374             // then we should keep the caret showing at the start of the line
 375             // by showing the m_caretAtLineStart flag.
 376             wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(position);
 377             wxRichTextLine* line = GetBuffer().GetLineAtPosition(position);
 378
 379             if (line && para && line->GetAbsoluteRange().GetStart() == position && para->GetRange().GetStart() != position)
 380                 caretAtLineStart = true;
 381             position --;
 382         }
 383
 384         if (m_caretPosition != position)
 385         {
 386             bool extendSel = ExtendSelection(m_caretPosition, position, wxRICHTEXT_SHIFT_DOWN);
 387
 388             MoveCaret(position, caretAtLineStart);
 389             SetDefaultStyleToCursorStyle();
 390
 391             if (extendSel)
 392                 Refresh();
 393         }
 394     }
 395 }
 396
 397 /// Right-click
 398 void wxRichTextCtrl::OnRightClick(wxMouseEvent& event)
 399 {
 400     SetFocus();
 401     event.Skip();
 402 }
 403
 404 /// Left-double-click
 405 void wxRichTextCtrl::OnLeftDClick(wxMouseEvent& event)
 406 {
 407     event.Skip();
 408 }
 409
 410 /// Middle-click
 411 void wxRichTextCtrl::OnMiddleClick(wxMouseEvent& event)
 412 {
 413     event.Skip();
 414 }
 415
 416 /// Key press
 417 void wxRichTextCtrl::OnChar(wxKeyEvent& event)
 418 {
 419     int flags = 0;
 420     if (event.ControlDown())
 421         flags |= wxRICHTEXT_CTRL_DOWN;
 422     if (event.ShiftDown())
 423         flags |= wxRICHTEXT_SHIFT_DOWN;
 424     if (event.AltDown())
 425         flags |= wxRICHTEXT_ALT_DOWN;
 426
 427     if (event.GetKeyCode() == WXK_LEFT ||
 428         event.GetKeyCode() == WXK_RIGHT ||
 429         event.GetKeyCode() == WXK_UP ||
 430         event.GetKeyCode() == WXK_DOWN ||
 431         event.GetKeyCode() == WXK_HOME ||
 432         event.GetKeyCode() == WXK_PAGEUP ||
 433         event.GetKeyCode() == WXK_PAGEDOWN ||
 434         event.GetKeyCode() == WXK_PRIOR ||
 435         event.GetKeyCode() == WXK_NEXT ||
 436         event.GetKeyCode() == WXK_END)
 437     {
 438         Navigate(event.GetKeyCode(), flags);
 439     }
 440     else if (event.GetKeyCode() == WXK_RETURN)
 441     {
 442         BeginBatchUndo(_("Insert Text"));
 443
 444         long newPos = m_caretPosition;
 445
 446         DeleteSelectedContent(& newPos);
 447
 448         GetBuffer().InsertNewlineWithUndo(newPos+1, this);
 449
 450         wxRichTextEvent cmdEvent(
 451             wxEVT_COMMAND_RICHTEXT_RETURN,
 452             GetId());
 453         cmdEvent.SetEventObject(this);
 454         cmdEvent.SetFlags(flags);
 455         GetEventHandler()->ProcessEvent(cmdEvent);
 456
 457         EndBatchUndo();
 458         SetDefaultStyleToCursorStyle();
 459     }
 460     else if (event.GetKeyCode() == WXK_BACK)
 461     {
 462         BeginBatchUndo(_("Delete Text"));
 463
 464         // Submit range in character positions, which are greater than caret positions,
 465         // so subtract 1 for deleted character and add 1 for conversion to character position.
 466         if (m_caretPosition > -1 && !HasSelection())
 467         {
 468             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition, m_caretPosition),
 469                 m_caretPosition,   // Current caret position
 470                 m_caretPosition-1, // New caret position
 471                 this);
 472         }
 473         else
 474             DeleteSelectedContent();
 475
 476         EndBatchUndo();
 477
 478         // Shouldn't this be in Do()?
 479         if (GetLastPosition() == -1)
 480         {
 481             GetBuffer().Reset();
 482
 483             m_caretPosition = -1;
 484             PositionCaret();
 485             SetDefaultStyleToCursorStyle();
 486         }
 487
 488     }
 489     else if (event.GetKeyCode() == WXK_DELETE)
 490     {
 491         BeginBatchUndo(_("Delete Text"));
 492
 493         // Submit range in character positions, which are greater than caret positions,
 494         if (m_caretPosition < GetBuffer().GetRange().GetEnd()+1 && !HasSelection())
 495         {
 496             GetBuffer().DeleteRangeWithUndo(wxRichTextRange(m_caretPosition+1, m_caretPosition+1),
 497                 m_caretPosition,   // Current caret position
 498                 m_caretPosition+1, // New caret position
 499                 this);
 500         }
 501         else
 502             DeleteSelectedContent();
 503
 504         EndBatchUndo();
 505
 506         // Shouldn't this be in Do()?
 507         if (GetLastPosition() == -1)
 508         {
 509             GetBuffer().Reset();
 510
 511             m_caretPosition = -1;
 512             PositionCaret();
 513             SetDefaultStyleToCursorStyle();
 514         }
 515     }
 516     else
 517     {
 518         BeginBatchUndo(_("Insert Text"));
 519
 520         long newPos = m_caretPosition;
 521         DeleteSelectedContent(& newPos);
 522
 523         wxString str = (wxChar) event.GetKeyCode();
 524         GetBuffer().InsertTextWithUndo(newPos+1, str, this);
 525
 526         EndBatchUndo();
 527
 528         SetDefaultStyleToCursorStyle();
 529     }
 530 #if 0
 531     else
 532         event.Skip();
 533 #endif
 534 }
 535
 536 /// Delete content if there is a selection, e.g. when pressing a key.
 537 bool wxRichTextCtrl::DeleteSelectedContent(long* newPos)
 538 {
 539     if (HasSelection())
 540     {
 541         long pos = m_selectionRange.GetStart();
 542         GetBuffer().DeleteRangeWithUndo(m_selectionRange,
 543             m_caretPosition,       // Current caret position
 544             pos,    // New caret position
 545             this);
 546         m_selectionRange.SetRange(-2, -2);
 547
 548         if (newPos)
 549             *newPos = pos-1;
 550         return true;
 551     }
 552     else
 553         return false;
 554 }
 555
 556 /// Keyboard navigation
 557
 558 /*
 559
 560 Left:       left one character
 561 Right:      right one character
 562 Up:         up one line
 563 Down:       down one line
 564 Ctrl-Left:  left one word
 565 Ctrl-Right: right one word
 566 Ctrl-Up:    previous paragraph start
 567 Ctrl-Down:  next start of paragraph
 568 Home:       start of line
 569 End:        end of line
 570 Ctrl-Home:  start of document
 571 Ctrl-End:   end of document
 572 Page-Up:    Up a screen
 573 Page-Down:  Down a screen
 574
 575 Maybe:
 576
 577 Ctrl-Alt-PgUp: Start of window
 578 Ctrl-Alt-PgDn: End of window
 579 F8:         Start selection mode
 580 Esc:        End selection mode
 581
 582 Adding Shift does the above but starts/extends selection.
 583
 584
 585  */
 586
 587 bool wxRichTextCtrl::Navigate(int keyCode, int flags)
 588 {
 589     bool success = false;
 590     Freeze();
 591
 592     if (keyCode == WXK_RIGHT)
 593     {
 594         if (flags & wxRICHTEXT_CTRL_DOWN)
 595             success = WordRight(1, flags);
 596         else
 597             success = MoveRight(1, flags);
 598     }
 599     else if (keyCode == WXK_LEFT)
 600     {
 601         if (flags & wxRICHTEXT_CTRL_DOWN)
 602             success = WordLeft(1, flags);
 603         else
 604             success = MoveLeft(1, flags);
 605     }
 606     else if (keyCode == WXK_UP)
 607     {
 608         if (flags & wxRICHTEXT_CTRL_DOWN)
 609             success = MoveToParagraphStart(flags);
 610         else
 611             success = MoveUp(1, flags);
 612     }
 613     else if (keyCode == WXK_DOWN)
 614     {
 615         if (flags & wxRICHTEXT_CTRL_DOWN)
 616             success = MoveToParagraphEnd(flags);
 617         else
 618             success = MoveDown(1, flags);
 619     }
 620     else if (keyCode == WXK_PAGEUP || keyCode == WXK_PRIOR)
 621     {
 622         success = PageUp(1, flags);
 623     }
 624     else if (keyCode == WXK_PAGEDOWN || keyCode == WXK_NEXT)
 625     {
 626         success = PageDown(1, flags);
 627     }
 628     else if (keyCode == WXK_HOME)
 629     {
 630         if (flags & wxRICHTEXT_CTRL_DOWN)
 631             success = MoveHome(flags);
 632         else
 633             success = MoveToLineStart(flags);
 634     }
 635     else if (keyCode == WXK_END)
 636     {
 637         if (flags & wxRICHTEXT_CTRL_DOWN)
 638             success = MoveEnd(flags);
 639         else
 640             success = MoveToLineEnd(flags);
 641     }
 642
 643     if (success)
 644     {
 645         ScrollIntoView(m_caretPosition, keyCode);
 646         SetDefaultStyleToCursorStyle();
 647     }
 648
 649     Thaw(false);
 650
 651     return success;
 652 }
 653
 654 /// Extend the selection. Selections are in caret positions.
 655 bool wxRichTextCtrl::ExtendSelection(long oldPos, long newPos, int flags)
 656 {
 657     if (flags & wxRICHTEXT_SHIFT_DOWN)
 658     {
 659         // If not currently selecting, start selecting
 660         if (m_selectionRange.GetStart() == -2)
 661         {
 662             m_selectionAnchor = oldPos;
 663
 664             if (oldPos > newPos)
 665                 m_selectionRange.SetRange(newPos+1, oldPos);
 666             else
 667                 m_selectionRange.SetRange(oldPos+1, newPos);
 668         }
 669         else
 670         {
 671             // Always ensure that the selection range start is greater than
 672             // the end.
 673             if (newPos > m_selectionAnchor)
 674                 m_selectionRange.SetRange(m_selectionAnchor+1, newPos);
 675             else
 676                 m_selectionRange.SetRange(newPos+1, m_selectionAnchor);
 677         }
 678
 679         if (m_selectionRange.GetStart() > m_selectionRange.GetEnd())
 680         {
 681             wxLogDebug(wxT("Strange selection range"));
 682         }
 683
 684         return true;
 685     }
 686     else
 687         return false;
 688 }
 689
 690 /// Scroll into view, returning true if we scrolled.
 691 /// This takes a _caret_ position.
 692 bool wxRichTextCtrl::ScrollIntoView(long position, int keyCode)
 693 {
 694     wxRichTextLine* line = GetVisibleLineForCaretPosition(position);
 695
 696     if (!line)
 697         return false;
 698
 699     int ppuX, ppuY;
 700     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 701
 702     int startX, startY;
 703     GetViewStart(& startX, & startY);
 704     startX = 0;
 705     startY = startY * ppuY;
 706
 707     int sx, sy;
 708     GetVirtualSize(& sx, & sy);
 709     sx = 0;
 710     if (ppuY != 0)
 711         sy = sy/ppuY;
 712
 713     wxRect rect = line->GetRect();
 714
 715     bool scrolled = false;
 716
 717     wxSize clientSize = GetClientSize();
 718
 719     // Going down
 720     if (keyCode == WXK_DOWN || keyCode == WXK_RIGHT || keyCode == WXK_END || keyCode == WXK_NEXT || keyCode == WXK_PAGEDOWN)
 721     {
 722         if ((rect.y + rect.height) > (clientSize.y + startY))
 723         {
 724             // Make it scroll so this item is at the bottom
 725             // of the window
 726             int y = rect.y - (clientSize.y - rect.height);
 727             y = (int) (0.5 + y/ppuY);
 728
 729             if (startY != y)
 730             {
 731                 SetScrollbars(ppuX, ppuY, sx, sy, 0, y);
 732                 scrolled = true;
 733             }
 734         }
 735         else if (rect.y < startY)
 736         {
 737             // Make it scroll so this item is at the top
 738             // of the window
 739             int y = rect.y ;
 740             y = (int) (0.5 + y/ppuY);
 741
 742             if (startY != y)
 743             {
 744                 SetScrollbars(ppuX, ppuY, sx, sy, 0, y);
 745                 scrolled = true;
 746             }
 747         }
 748     }
 749     // Going up
 750     else if (keyCode == WXK_UP || keyCode == WXK_LEFT || keyCode == WXK_HOME || keyCode == WXK_PRIOR || keyCode == WXK_PAGEUP)
 751     {
 752         if (rect.y < startY)
 753         {
 754             // Make it scroll so this item is at the top
 755             // of the window
 756             int y = rect.y ;
 757             y = (int) (0.5 + y/ppuY);
 758
 759             if (startY != y)
 760             {
 761                 SetScrollbars(ppuX, ppuY, sx, sy, 0, y);
 762                 scrolled = true;
 763             }
 764         }
 765         else if ((rect.y + rect.height) > (clientSize.y + startY))
 766         {
 767             // Make it scroll so this item is at the bottom
 768             // of the window
 769             int y = rect.y - (clientSize.y - rect.height);
 770             y = (int) (0.5 + y/ppuY);
 771
 772             if (startY != y)
 773             {
 774                 SetScrollbars(ppuX, ppuY, sx, sy, 0, y);
 775                 scrolled = true;
 776             }
 777         }
 778     }
 779     PositionCaret();
 780
 781     return scrolled;
 782 }
 783
 784 /// Is the given position visible on the screen?
 785 bool wxRichTextCtrl::IsPositionVisible(long pos) const
 786 {
 787     wxRichTextLine* line = GetVisibleLineForCaretPosition(pos-1);
 788
 789     if (!line)
 790         return false;
 791
 792     int ppuX, ppuY;
 793     GetScrollPixelsPerUnit(& ppuX, & ppuY);
 794
 795     int startX, startY;
 796     GetViewStart(& startX, & startY);
 797     startX = 0;
 798     startY = startY * ppuY;
 799
 800     int sx, sy;
 801     GetVirtualSize(& sx, & sy);
 802     sx = 0;
 803     if (ppuY != 0)
 804         sy = sy/ppuY;
 805
 806     wxRect rect = line->GetRect();
 807
 808     wxSize clientSize = GetClientSize();
 809
 810     return !(((rect.y + rect.height) > (clientSize.y + startY)) || rect.y < startY);
 811 }
 812
 813 void wxRichTextCtrl::SetCaretPosition(long position, bool showAtLineStart)
 814 {
 815     m_caretPosition = position;
 816     m_caretAtLineStart = showAtLineStart;
 817 }
 818
 819 /// Move caret one visual step forward: this may mean setting a flag
 820 /// and keeping the same position if we're going from the end of one line
 821 /// to the start of the next, which may be the exact same caret position.
 822 void wxRichTextCtrl::MoveCaretForward(long oldPosition)
 823 {
 824     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
 825
 826     // Only do the check if we're not at the end of the paragraph (where things work OK
 827     // anyway)
 828     if (para && (oldPosition != para->GetRange().GetEnd() - 1))
 829     {
 830         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
 831
 832         if (line)
 833         {
 834             wxRichTextRange lineRange = line->GetAbsoluteRange();
 835
 836             // We're at the end of a line. See whether we need to
 837             // stay at the same actual caret position but change visual
 838             // position, or not.
 839             if (oldPosition == lineRange.GetEnd())
 840             {
 841                 if (m_caretAtLineStart)
 842                 {
 843                     // We're already at the start of the line, so actually move on now.
 844                     m_caretPosition = oldPosition + 1;
 845                     m_caretAtLineStart = false;
 846                 }
 847                 else
 848                 {
 849                     // We're showing at the end of the line, so keep to
 850                     // the same position but indicate that we're to show
 851                     // at the start of the next line.
 852                     m_caretPosition = oldPosition;
 853                     m_caretAtLineStart = true;
 854                 }
 855                 SetDefaultStyleToCursorStyle();
 856                 return;
 857             }
 858         }
 859     }
 860     m_caretPosition ++;
 861     SetDefaultStyleToCursorStyle();
 862 }
 863
 864 /// Move caret one visual step backward: this may mean setting a flag
 865 /// and keeping the same position if we're going from the end of one line
 866 /// to the start of the next, which may be the exact same caret position.
 867 void wxRichTextCtrl::MoveCaretBack(long oldPosition)
 868 {
 869     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(oldPosition);
 870
 871     // Only do the check if we're not at the start of the paragraph (where things work OK
 872     // anyway)
 873     if (para && (oldPosition != para->GetRange().GetStart()))
 874     {
 875         wxRichTextLine* line = GetBuffer().GetLineAtPosition(oldPosition);
 876
 877         if (line)
 878         {
 879             wxRichTextRange lineRange = line->GetAbsoluteRange();
 880
 881             // We're at the start of a line. See whether we need to
 882             // stay at the same actual caret position but change visual
 883             // position, or not.
 884             if (oldPosition == lineRange.GetStart())
 885             {
 886                 m_caretPosition = oldPosition-1;
 887                 m_caretAtLineStart = true;
 888                 return;
 889             }
 890             else if (oldPosition == lineRange.GetEnd())
 891             {
 892                 if (m_caretAtLineStart)
 893                 {
 894                     // We're at the start of the line, so keep the same caret position
 895                     // but clear the start-of-line flag.
 896                     m_caretPosition = oldPosition;
 897                     m_caretAtLineStart = false;
 898                 }
 899                 else
 900                 {
 901                     // We're showing at the end of the line, so go back
 902                     // to the previous character position.
 903                     m_caretPosition = oldPosition - 1;
 904                 }
 905                 SetDefaultStyleToCursorStyle();
 906                 return;
 907             }
 908         }
 909     }
 910     m_caretPosition --;
 911     SetDefaultStyleToCursorStyle();
 912 }
 913
 914 /// Move right
 915 bool wxRichTextCtrl::MoveRight(int noPositions, int flags)
 916 {
 917     long endPos = GetBuffer().GetRange().GetEnd();
 918
 919     if (m_caretPosition + noPositions < endPos)
 920     {
 921         long oldPos = m_caretPosition;
 922         long newPos = m_caretPosition + noPositions;
 923
 924         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
 925         if (!extendSel)
 926             SelectNone();
 927
 928         // Determine by looking at oldPos and m_caretPosition whether
 929         // we moved from the end of a line to the start of the next line, in which case
 930         // we want to adjust the caret position such that it is positioned at the
 931         // start of the next line, rather than jumping past the first character of the
 932         // line.
 933         if (noPositions == 1 && !extendSel)
 934             MoveCaretForward(oldPos);
 935         else
 936             SetCaretPosition(newPos);
 937
 938         PositionCaret();
 939         SetDefaultStyleToCursorStyle();
 940
 941         if (extendSel)
 942             Refresh();
 943         return true;
 944     }
 945     else
 946         return false;
 947 }
 948
 949 /// Move left
 950 bool wxRichTextCtrl::MoveLeft(int noPositions, int flags)
 951 {
 952     long startPos = -1;
 953
 954     if (m_caretPosition > startPos - noPositions + 1)
 955     {
 956         long oldPos = m_caretPosition;
 957         long newPos = m_caretPosition - noPositions;
 958         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
 959         if (!extendSel)
 960             SelectNone();
 961
 962         if (noPositions == 1 && !extendSel)
 963             MoveCaretBack(oldPos);
 964         else
 965             SetCaretPosition(newPos);
 966
 967         PositionCaret();
 968         SetDefaultStyleToCursorStyle();
 969
 970         if (extendSel)
 971             Refresh();
 972         return true;
 973     }
 974     else
 975         return false;
 976 }
 977
 978 /// Move up
 979 bool wxRichTextCtrl::MoveUp(int noLines, int flags)
 980 {
 981     return MoveDown(- noLines, flags);
 982 }
 983
 984 /// Move up
 985 bool wxRichTextCtrl::MoveDown(int noLines, int flags)
 986 {
 987     if (!GetCaret())
 988         return false;
 989
 990     long lineNumber = GetBuffer().GetVisibleLineNumber(m_caretPosition, true, m_caretAtLineStart);
 991     wxPoint pt = GetCaret()->GetPosition();
 992     long newLine = lineNumber + noLines;
 993
 994     if (lineNumber != -1)
 995     {
 996         if (noLines > 0)
 997         {
 998             long lastLine = GetBuffer().GetVisibleLineNumber(GetBuffer().GetRange().GetEnd());
 999
1000             if (newLine > lastLine)
1001                 return false;
1002         }
1003         else
1004         {
1005             if (newLine < 0)
1006                 return false;
1007         }
1008     }
1009
1010     wxRichTextLine* lineObj = GetBuffer().GetLineForVisibleLineNumber(newLine);
1011     if (lineObj)
1012     {
1013         pt.y = lineObj->GetAbsolutePosition().y + 2;
1014     }
1015     else
1016         return false;
1017
1018     long newPos = 0;
1019     wxClientDC dc(this);
1020     PrepareDC(dc);
1021     dc.SetFont(GetFont());
1022
1023     int hitTest = GetBuffer().HitTest(dc, pt, newPos);
1024
1025     if (hitTest != wxRICHTEXT_HITTEST_NONE)
1026     {
1027         // If end of previous line, and hitTest is wxRICHTEXT_HITTEST_BEFORE,
1028         // we want to be at the end of the last line but with m_caretAtLineStart set to true,
1029         // so we view the caret at the start of the line.
1030         bool caretLineStart = false;
1031         if (hitTest == wxRICHTEXT_HITTEST_BEFORE)
1032         {
1033             wxRichTextLine* thisLine = GetBuffer().GetLineAtPosition(newPos-1);
1034             wxRichTextRange lineRange;
1035             if (thisLine)
1036                 lineRange = thisLine->GetAbsoluteRange();
1037
1038             if (thisLine && (newPos-1) == lineRange.GetEnd())
1039             {
1040                 newPos --;
1041                 caretLineStart = true;
1042             }
1043             else
1044             {
1045                 wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(newPos);
1046                 if (para && para->GetRange().GetStart() == newPos)
1047                     newPos --;
1048             }
1049         }
1050
1051         long newSelEnd = newPos;
1052
1053         bool extendSel = ExtendSelection(m_caretPosition, newSelEnd, flags);
1054         if (!extendSel)
1055             SelectNone();
1056
1057         SetCaretPosition(newPos, caretLineStart);
1058         PositionCaret();
1059         SetDefaultStyleToCursorStyle();
1060
1061         if (extendSel)
1062             Refresh();
1063         return true;
1064     }
1065     else
1066         return false;
1067 }
1068
1069 /// Move to the end of the paragraph
1070 bool wxRichTextCtrl::MoveToParagraphEnd(int flags)
1071 {
1072     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1073     if (para)
1074     {
1075         long newPos = para->GetRange().GetEnd() - 1;
1076         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1077         if (!extendSel)
1078             SelectNone();
1079
1080         SetCaretPosition(newPos);
1081         PositionCaret();
1082         SetDefaultStyleToCursorStyle();
1083
1084         if (extendSel)
1085             Refresh();
1086         return true;
1087     }
1088
1089     return false;
1090 }
1091
1092 /// Move to the start of the paragraph
1093 bool wxRichTextCtrl::MoveToParagraphStart(int flags)
1094 {
1095     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(m_caretPosition, true);
1096     if (para)
1097     {
1098         long newPos = para->GetRange().GetStart() - 1;
1099         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1100         if (!extendSel)
1101             SelectNone();
1102
1103         SetCaretPosition(newPos);
1104         PositionCaret();
1105         SetDefaultStyleToCursorStyle();
1106
1107         if (extendSel)
1108             Refresh();
1109         return true;
1110     }
1111
1112     return false;
1113 }
1114
1115 /// Move to the end of the line
1116 bool wxRichTextCtrl::MoveToLineEnd(int flags)
1117 {
1118     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1119
1120     if (line)
1121     {
1122         wxRichTextRange lineRange = line->GetAbsoluteRange();
1123         long newPos = lineRange.GetEnd();
1124         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1125         if (!extendSel)
1126             SelectNone();
1127
1128         SetCaretPosition(newPos);
1129         PositionCaret();
1130         SetDefaultStyleToCursorStyle();
1131
1132         if (extendSel)
1133             Refresh();
1134         return true;
1135     }
1136
1137     return false;
1138 }
1139
1140 /// Move to the start of the line
1141 bool wxRichTextCtrl::MoveToLineStart(int flags)
1142 {
1143     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1144     if (line)
1145     {
1146         wxRichTextRange lineRange = line->GetAbsoluteRange();
1147         long newPos = lineRange.GetStart()-1;
1148
1149         bool extendSel = ExtendSelection(m_caretPosition, newPos, flags);
1150         if (!extendSel)
1151             SelectNone();
1152
1153         wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(line);
1154
1155         SetCaretPosition(newPos, para->GetRange().GetStart() != lineRange.GetStart());
1156         PositionCaret();
1157         SetDefaultStyleToCursorStyle();
1158
1159         if (extendSel)
1160             Refresh();
1161         return true;
1162     }
1163
1164     return false;
1165 }
1166
1167 /// Move to the start of the buffer
1168 bool wxRichTextCtrl::MoveHome(int flags)
1169 {
1170     if (m_caretPosition != -1)
1171     {
1172         bool extendSel = ExtendSelection(m_caretPosition, -1, flags);
1173         if (!extendSel)
1174             SelectNone();
1175
1176         SetCaretPosition(-1);
1177         PositionCaret();
1178         SetDefaultStyleToCursorStyle();
1179
1180         if (extendSel)
1181             Refresh();
1182         return true;
1183     }
1184     else
1185         return false;
1186 }
1187
1188 /// Move to the end of the buffer
1189 bool wxRichTextCtrl::MoveEnd(int flags)
1190 {
1191     long endPos = GetBuffer().GetRange().GetEnd()-1;
1192
1193     if (m_caretPosition != endPos)
1194     {
1195         bool extendSel = ExtendSelection(m_caretPosition, endPos, flags);
1196         if (!extendSel)
1197             SelectNone();
1198
1199         SetCaretPosition(endPos);
1200         PositionCaret();
1201         SetDefaultStyleToCursorStyle();
1202
1203         if (extendSel)
1204             Refresh();
1205         return true;
1206     }
1207     else
1208         return false;
1209 }
1210
1211 /// Move noPages pages up
1212 bool wxRichTextCtrl::PageUp(int noPages, int flags)
1213 {
1214     return PageDown(- noPages, flags);
1215 }
1216
1217 /// Move noPages pages down
1218 bool wxRichTextCtrl::PageDown(int noPages, int flags)
1219 {
1220     // Calculate which line occurs noPages * screen height further down.
1221     wxRichTextLine* line = GetVisibleLineForCaretPosition(m_caretPosition);
1222     if (line)
1223     {
1224         wxSize clientSize = GetClientSize();
1225         int newY = line->GetAbsolutePosition().y + noPages*clientSize.y;
1226
1227         wxRichTextLine* newLine = GetBuffer().GetLineAtYPosition(newY);
1228         if (newLine)
1229         {
1230             wxRichTextRange lineRange = newLine->GetAbsoluteRange();
1231             long pos = lineRange.GetStart()-1;
1232             if (pos != m_caretPosition)
1233             {
1234                 wxRichTextParagraph* para = GetBuffer().GetParagraphForLine(newLine);
1235
1236                 bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1237                 if (!extendSel)
1238                     SelectNone();
1239
1240                 SetCaretPosition(pos, para->GetRange().GetStart() != lineRange.GetStart());
1241                 PositionCaret();
1242                 SetDefaultStyleToCursorStyle();
1243
1244                 if (extendSel)
1245                     Refresh();
1246                 return true;
1247             }
1248         }
1249     }
1250
1251     return false;
1252 }
1253
1254 // Finds the caret position for the next word
1255 long wxRichTextCtrl::FindNextWordPosition(int direction) const
1256 {
1257     long endPos = GetBuffer().GetRange().GetEnd();
1258
1259     if (direction > 0)
1260     {
1261         long i = m_caretPosition+1+direction; // +1 for conversion to character pos
1262
1263         // First skip current text to space
1264         while (i < endPos && i > -1)
1265         {
1266             // i is in character, not caret positions
1267             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1268             if (text != wxT(" ") && !text.empty())
1269                 i += direction;
1270             else
1271             {
1272                 break;
1273             }
1274         }
1275         while (i < endPos && i > -1)
1276         {
1277             // i is in character, not caret positions
1278             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1279             if (text.empty()) // End of paragraph, or maybe an image
1280                 return wxMax(-1, i - 1);
1281             else if (text == wxT(" ") || text.empty())
1282                 i += direction;
1283             else
1284             {
1285                 // Convert to caret position
1286                 return wxMax(-1, i - 1);
1287             }
1288         }
1289         if (i >= endPos)
1290             return endPos-1;
1291         return i-1;
1292     }
1293     else
1294     {
1295         long i = m_caretPosition;
1296
1297         // First skip white space
1298         while (i < endPos && i > -1)
1299         {
1300             // i is in character, not caret positions
1301             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1302             if (text.empty()) // End of paragraph, or maybe an image
1303                 break;
1304             else if (text == wxT(" ") || text.empty())
1305                 i += direction;
1306             else
1307                 break;
1308         }
1309         // Next skip current text to space
1310         while (i < endPos && i > -1)
1311         {
1312             // i is in character, not caret positions
1313             wxString text = GetBuffer().GetTextForRange(wxRichTextRange(i, i));
1314             if (text != wxT(" ") /* && !text.empty() */)
1315                 i += direction;
1316             else
1317             {
1318                 return i;
1319             }
1320         }
1321         if (i < -1)
1322             return -1;
1323         return i;
1324     }
1325 }
1326
1327 /// Move n words left
1328 bool wxRichTextCtrl::WordLeft(int WXUNUSED(n), int flags)
1329 {
1330     long pos = FindNextWordPosition(-1);
1331     if (pos != m_caretPosition)
1332     {
1333         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1334
1335         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1336         if (!extendSel)
1337             SelectNone();
1338
1339         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1340         PositionCaret();
1341         SetDefaultStyleToCursorStyle();
1342
1343         if (extendSel)
1344             Refresh();
1345         return true;
1346     }
1347
1348     return false;
1349 }
1350
1351 /// Move n words right
1352 bool wxRichTextCtrl::WordRight(int WXUNUSED(n), int flags)
1353 {
1354     long pos = FindNextWordPosition(1);
1355     if (pos != m_caretPosition)
1356     {
1357         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(pos, true);
1358
1359         bool extendSel = ExtendSelection(m_caretPosition, pos, flags);
1360         if (!extendSel)
1361             SelectNone();
1362
1363         SetCaretPosition(pos, para->GetRange().GetStart() != pos);
1364         PositionCaret();
1365         SetDefaultStyleToCursorStyle();
1366
1367         if (extendSel)
1368             Refresh();
1369         return true;
1370     }
1371
1372     return false;
1373 }
1374
1375 /// Sizing
1376 void wxRichTextCtrl::OnSize(wxSizeEvent& event)
1377 {
1378     // Only do sizing optimization for large buffers
1379     if (GetBuffer().GetRange().GetEnd() > m_delayedLayoutThreshold)
1380     {
1381         m_fullLayoutRequired = true;
1382         m_fullLayoutTime = wxGetLocalTimeMillis();
1383         m_fullLayoutSavedPosition = GetFirstVisiblePosition();
1384         LayoutContent(true /* onlyVisibleRect */);
1385     }
1386     else
1387         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1388
1389     RecreateBuffer();
1390
1391     event.Skip();
1392 }
1393
1394
1395 /// Idle-time processing
1396 void wxRichTextCtrl::OnIdle(wxIdleEvent& event)
1397 {
1398     const int layoutInterval = wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL;
1399
1400     if (m_fullLayoutRequired && (wxGetLocalTimeMillis() > (m_fullLayoutTime + layoutInterval)))
1401     {
1402         m_fullLayoutRequired = false;
1403         m_fullLayoutTime = 0;
1404         GetBuffer().Invalidate(wxRICHTEXT_ALL);
1405         ShowPosition(m_fullLayoutSavedPosition);
1406         Refresh();
1407     }
1408     event.Skip();
1409 }
1410
1411 /// Scrolling
1412 void wxRichTextCtrl::OnScroll(wxScrollWinEvent& event)
1413 {
1414     // Not used
1415     event.Skip();
1416 }
1417
1418 /// Set up scrollbars, e.g. after a resize
1419 void wxRichTextCtrl::SetupScrollbars(bool atTop)
1420 {
1421     if (m_freezeCount)
1422         return;
1423
1424     if (GetBuffer().IsEmpty())
1425     {
1426         SetScrollbars(0, 0, 0, 0, 0, 0);
1427         return;
1428     }
1429
1430     // TODO: reimplement scrolling so we scroll by line, not by fixed number
1431     // of pixels. See e.g. wxVScrolledWindow for ideas.
1432     int pixelsPerUnit = 5; // 10;
1433     wxSize clientSize = GetClientSize();
1434
1435     int maxHeight = GetBuffer().GetCachedSize().y;
1436
1437     int unitsY = maxHeight/pixelsPerUnit;
1438
1439     int startX = 0, startY = 0;
1440     if (!atTop)
1441         GetViewStart(& startX, & startY);
1442
1443     int maxPositionX = 0; // wxMax(sz.x - clientSize.x, 0);
1444     int maxPositionY = (wxMax(maxHeight - clientSize.y, 0))/pixelsPerUnit;
1445
1446     // Move to previous scroll position if
1447     // possible
1448     SetScrollbars(0, pixelsPerUnit,
1449         0, unitsY,
1450         wxMin(maxPositionX, startX), wxMin(maxPositionY, startY));
1451 }
1452
1453 /// Paint the background
1454 void wxRichTextCtrl::PaintBackground(wxDC& dc)
1455 {
1456     wxColour backgroundColour = GetBackgroundColour();
1457     if (!backgroundColour.Ok())
1458         backgroundColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
1459
1460     // Clear the background
1461     dc.SetBrush(wxBrush(backgroundColour));
1462     dc.SetPen(*wxTRANSPARENT_PEN);
1463     wxRect windowRect(GetClientSize());
1464     windowRect.x -= 2; windowRect.y -= 2;
1465     windowRect.width += 4; windowRect.height += 4;
1466
1467     // We need to shift the rectangle to take into account
1468     // scrolling. Converting device to logical coordinates.
1469     CalcUnscrolledPosition(windowRect.x, windowRect.y, & windowRect.x, & windowRect.y);
1470     dc.DrawRectangle(windowRect);
1471 }
1472
1473 /// Recreate buffer bitmap if necessary
1474 bool wxRichTextCtrl::RecreateBuffer(const wxSize& size)
1475 {
1476     wxSize sz = size;
1477     if (sz == wxDefaultSize)
1478         sz = GetClientSize();
1479
1480     if (sz.x < 1 || sz.y < 1)
1481         return false;
1482
1483     if (!m_bufferBitmap.Ok() || m_bufferBitmap.GetWidth() < sz.x || m_bufferBitmap.GetHeight() < sz.y)
1484         m_bufferBitmap = wxBitmap(sz.x, sz.y);
1485     return m_bufferBitmap.Ok();
1486 }
1487
1488 // ----------------------------------------------------------------------------
1489 // file IO functions
1490 // ----------------------------------------------------------------------------
1491
1492 bool wxRichTextCtrl::LoadFile(const wxString& filename, int type)
1493 {
1494     bool success = GetBuffer().LoadFile(filename, type);
1495     if (success)
1496         m_filename = filename;
1497
1498     DiscardEdits();
1499     SetInsertionPoint(0);
1500     LayoutContent();
1501     PositionCaret();
1502     SetupScrollbars(true);
1503     Refresh();
1504     SendUpdateEvent();
1505
1506     if (success)
1507         return true;
1508     else
1509     {
1510         wxLogError(_("File couldn't be loaded."));
1511
1512         return false;
1513     }
1514 }
1515
1516 bool wxRichTextCtrl::SaveFile(const wxString& filename, int type)
1517 {
1518     wxString filenameToUse = filename.empty() ? m_filename : filename;
1519     if ( filenameToUse.empty() )
1520     {
1521         // what kind of message to give? is it an error or a program bug?
1522         wxLogDebug(wxT("Can't save textctrl to file without filename."));
1523
1524         return false;
1525     }
1526
1527     if (GetBuffer().SaveFile(filenameToUse, type))
1528     {
1529         m_filename = filenameToUse;
1530
1531         DiscardEdits();
1532
1533         return true;
1534
1535     }
1536
1537     wxLogError(_("The text couldn't be saved."));
1538
1539     return false;
1540 }
1541
1542 // ----------------------------------------------------------------------------
1543 // wxRichTextCtrl specific functionality
1544 // ----------------------------------------------------------------------------
1545
1546 /// Add a new paragraph of text to the end of the buffer
1547 wxRichTextRange wxRichTextCtrl::AddParagraph(const wxString& text)
1548 {
1549     return GetBuffer().AddParagraph(text);
1550 }
1551
1552 /// Add an image
1553 wxRichTextRange wxRichTextCtrl::AddImage(const wxImage& image)
1554 {
1555     return GetBuffer().AddImage(image);
1556 }
1557
1558 // ----------------------------------------------------------------------------
1559 // selection and ranges
1560 // ----------------------------------------------------------------------------
1561
1562 void wxRichTextCtrl::SelectAll()
1563 {
1564     SetSelection(0, GetLastPosition());
1565     m_selectionAnchor = -1;
1566 }
1567
1568 /// Select none
1569 void wxRichTextCtrl::SelectNone()
1570 {
1571     if (!(GetSelectionRange() == wxRichTextRange(-2, -2)))
1572         SetSelection(-2, -2);
1573     m_selectionAnchor = -2;
1574 }
1575
1576 wxString wxRichTextCtrl::GetStringSelection() const
1577 {
1578     long from, to;
1579     GetSelection(&from, &to);
1580
1581     return GetRange(from, to);
1582 }
1583
1584 // do the window-specific processing after processing the update event
1585 void wxRichTextCtrl::DoUpdateWindowUI(wxUpdateUIEvent& event)
1586 {
1587     if ( event.GetSetEnabled() )
1588         Enable(event.GetEnabled());
1589
1590     if ( event.GetSetText() )
1591     {
1592         if ( event.GetText() != GetValue() )
1593             SetValue(event.GetText());
1594     }
1595 }
1596
1597 // ----------------------------------------------------------------------------
1598 // hit testing
1599 // ----------------------------------------------------------------------------
1600
1601 wxTextCtrlHitTestResult
1602 wxRichTextCtrl::HitTest(const wxPoint& pt, wxTextCoord *x, wxTextCoord *y) const
1603 {
1604     // implement in terms of the other overload as the native ports typically
1605     // can get the position and not (x, y) pair directly (although wxUniv
1606     // directly gets x and y -- and so overrides this method as well)
1607     long pos;
1608     wxTextCtrlHitTestResult rc = HitTest(pt, &pos);
1609
1610     if ( rc != wxTE_HT_UNKNOWN )
1611     {
1612         PositionToXY(pos, x, y);
1613     }
1614
1615     return rc;
1616 }
1617
1618 wxTextCtrlHitTestResult
1619 wxRichTextCtrl::HitTest(const wxPoint& pt,
1620                         long * pos) const
1621 {
1622     wxClientDC dc((wxRichTextCtrl*) this);
1623     ((wxRichTextCtrl*)this)->PrepareDC(dc);
1624
1625     int hit = ((wxRichTextCtrl*)this)->GetBuffer().HitTest(dc, pt, *pos);
1626     if (hit == wxRICHTEXT_HITTEST_BEFORE)
1627         return wxTE_HT_BEFORE;
1628     else if (hit == wxRICHTEXT_HITTEST_AFTER)
1629         return wxTE_HT_BEYOND;
1630     else if (hit == wxRICHTEXT_HITTEST_ON)
1631         return wxTE_HT_ON_TEXT;
1632     else
1633         return wxTE_HT_UNKNOWN;
1634 }
1635
1636 // ----------------------------------------------------------------------------
1637 // set/get the controls text
1638 // ----------------------------------------------------------------------------
1639
1640 wxString wxRichTextCtrl::GetValue() const
1641 {
1642     return GetBuffer().GetText();
1643 }
1644
1645 wxString wxRichTextCtrl::GetRange(long from, long to) const
1646 {
1647     return GetBuffer().GetTextForRange(wxRichTextRange(from, to));
1648 }
1649
1650 void wxRichTextCtrl::SetValue(const wxString& value)
1651 {
1652     Clear();
1653
1654     // if the text is long enough, it's faster to just set it instead of first
1655     // comparing it with the old one (chances are that it will be different
1656     // anyhow, this comparison is there to avoid flicker for small single-line
1657     // edit controls mostly)
1658     if ( (value.length() > 0x400) || (value != GetValue()) )
1659     {
1660         DoWriteText(value, false /* not selection only */);
1661
1662         // for compatibility, don't move the cursor when doing SetValue()
1663         SetInsertionPoint(0);
1664     }
1665     else // same text
1666     {
1667         // still send an event for consistency
1668         SendUpdateEvent();
1669     }
1670
1671     // we should reset the modified flag even if the value didn't really change
1672
1673     // mark the control as being not dirty - we changed its text, not the
1674     // user
1675     DiscardEdits();
1676 }
1677
1678 void wxRichTextCtrl::WriteText(const wxString& value)
1679 {
1680     DoWriteText(value);
1681 }
1682
1683 void wxRichTextCtrl::DoWriteText(const wxString& value, bool WXUNUSED(selectionOnly))
1684 {
1685     GetBuffer().InsertTextWithUndo(m_caretPosition+1, value, this);
1686 }
1687
1688 void wxRichTextCtrl::AppendText(const wxString& text)
1689 {
1690     SetInsertionPointEnd();
1691
1692     WriteText(text);
1693 }
1694
1695 /// Write an image at the current insertion point
1696 bool wxRichTextCtrl::WriteImage(const wxImage& image, int bitmapType)
1697 {
1698     wxRichTextImageBlock imageBlock;
1699
1700     wxImage image2 = image;
1701     if (imageBlock.MakeImageBlock(image2, bitmapType))
1702         return WriteImage(imageBlock);
1703     else
1704         return false;
1705 }
1706
1707 bool wxRichTextCtrl::WriteImage(const wxString& filename, int bitmapType)
1708 {
1709     wxRichTextImageBlock imageBlock;
1710
1711     wxImage image;
1712     if (imageBlock.MakeImageBlock(filename, bitmapType, image, false))
1713         return WriteImage(imageBlock);
1714     else
1715         return false;
1716 }
1717
1718 bool wxRichTextCtrl::WriteImage(const wxRichTextImageBlock& imageBlock)
1719 {
1720     return GetBuffer().InsertImageWithUndo(m_caretPosition+1, imageBlock, this);
1721 }
1722
1723 bool wxRichTextCtrl::WriteImage(const wxBitmap& bitmap, int bitmapType)
1724 {
1725     if (bitmap.Ok())
1726     {
1727         wxRichTextImageBlock imageBlock;
1728
1729         wxImage image = bitmap.ConvertToImage();
1730         if (image.Ok() && imageBlock.MakeImageBlock(image, bitmapType))
1731             return WriteImage(imageBlock);
1732         else
1733             return false;
1734     }
1735     return false;
1736 }
1737
1738 /// Insert a newline (actually paragraph) at the current insertion point.
1739 bool wxRichTextCtrl::Newline()
1740 {
1741     return GetBuffer().InsertNewlineWithUndo(m_caretPosition+1, this);
1742 }
1743
1744
1745 // ----------------------------------------------------------------------------
1746 // Clipboard operations
1747 // ----------------------------------------------------------------------------
1748
1749 void wxRichTextCtrl::Copy()
1750 {
1751     if (CanCopy())
1752     {
1753         wxRichTextRange range = GetSelectionRange();
1754         GetBuffer().CopyToClipboard(range);
1755     }
1756 }
1757
1758 void wxRichTextCtrl::Cut()
1759 {
1760     if (CanCut())
1761     {
1762         wxRichTextRange range = GetSelectionRange();
1763         GetBuffer().CopyToClipboard(range);
1764
1765         DeleteSelectedContent();
1766         LayoutContent();
1767         Refresh();
1768     }
1769 }
1770
1771 void wxRichTextCtrl::Paste()
1772 {
1773     if (CanPaste())
1774     {
1775         BeginBatchUndo(_("Paste"));
1776
1777         long newPos = m_caretPosition;
1778         DeleteSelectedContent(& newPos);
1779
1780         GetBuffer().PasteFromClipboard(newPos);
1781
1782         EndBatchUndo();
1783     }
1784 }
1785
1786 void wxRichTextCtrl::DeleteSelection()
1787 {
1788     if (CanDeleteSelection())
1789     {
1790         DeleteSelectedContent();
1791     }
1792 }
1793
1794 bool wxRichTextCtrl::HasSelection() const
1795 {
1796     return m_selectionRange.GetStart() != -2 && m_selectionRange.GetEnd() != -2;
1797 }
1798
1799 bool wxRichTextCtrl::CanCopy() const
1800 {
1801     // Can copy if there's a selection
1802     return HasSelection();
1803 }
1804
1805 bool wxRichTextCtrl::CanCut() const
1806 {
1807     return HasSelection() && IsEditable();
1808 }
1809
1810 bool wxRichTextCtrl::CanPaste() const
1811 {
1812     if ( !IsEditable() )
1813         return false;
1814
1815     return GetBuffer().CanPasteFromClipboard();
1816 }
1817
1818 bool wxRichTextCtrl::CanDeleteSelection() const
1819 {
1820     return HasSelection() && IsEditable();
1821 }
1822
1823
1824 // ----------------------------------------------------------------------------
1825 // Accessors
1826 // ----------------------------------------------------------------------------
1827
1828 void wxRichTextCtrl::SetEditable(bool editable)
1829 {
1830     m_editable = editable;
1831 }
1832
1833 void wxRichTextCtrl::SetInsertionPoint(long pos)
1834 {
1835     SelectNone();
1836
1837     m_caretPosition = pos - 1;
1838 }
1839
1840 void wxRichTextCtrl::SetInsertionPointEnd()
1841 {
1842     long pos = GetLastPosition();
1843     SetInsertionPoint(pos);
1844 }
1845
1846 long wxRichTextCtrl::GetInsertionPoint() const
1847 {
1848     return m_caretPosition+1;
1849 }
1850
1851 wxTextPos wxRichTextCtrl::GetLastPosition() const
1852 {
1853     return GetBuffer().GetRange().GetEnd();
1854 }
1855
1856 // If the return values from and to are the same, there is no
1857 // selection.
1858 void wxRichTextCtrl::GetSelection(long* from, long* to) const
1859 {
1860     *from = m_selectionRange.GetStart();
1861     *to = m_selectionRange.GetEnd();
1862 }
1863
1864 bool wxRichTextCtrl::IsEditable() const
1865 {
1866     return m_editable;
1867 }
1868
1869 // ----------------------------------------------------------------------------
1870 // selection
1871 // ----------------------------------------------------------------------------
1872
1873 void wxRichTextCtrl::SetSelection(long from, long to)
1874 {
1875     // if from and to are both -1, it means (in wxWidgets) that all text should
1876     // be selected.
1877     if ( (from == -1) && (to == -1) )
1878     {
1879         from = 0;
1880         to = GetLastPosition();
1881     }
1882
1883     DoSetSelection(from, to);
1884 }
1885
1886 void wxRichTextCtrl::DoSetSelection(long from, long to, bool WXUNUSED(scrollCaret))
1887 {
1888     m_selectionAnchor = from;
1889     m_selectionRange.SetRange(from, to);
1890     Refresh();
1891     PositionCaret();
1892 }
1893
1894 // ----------------------------------------------------------------------------
1895 // Editing
1896 // ----------------------------------------------------------------------------
1897
1898 void wxRichTextCtrl::Replace(long WXUNUSED(from), long WXUNUSED(to), const wxString& value)
1899 {
1900     BeginBatchUndo(_("Replace"));
1901
1902     DeleteSelectedContent();
1903
1904     DoWriteText(value, true /* selection only */);
1905
1906     EndBatchUndo();
1907 }
1908
1909 void wxRichTextCtrl::Remove(long from, long to)
1910 {
1911     SelectNone();
1912
1913     GetBuffer().DeleteRangeWithUndo(wxRichTextRange(from, to),
1914         m_caretPosition,       // Current caret position
1915         from,                           // New caret position
1916         this);
1917
1918     LayoutContent();
1919     if (!IsFrozen())
1920         Refresh();
1921 }
1922
1923 bool wxRichTextCtrl::IsModified() const
1924 {
1925     return m_buffer.IsModified();
1926 }
1927
1928 void wxRichTextCtrl::MarkDirty()
1929 {
1930     m_buffer.Modify(true);
1931 }
1932
1933 void wxRichTextCtrl::DiscardEdits()
1934 {
1935     m_buffer.Modify(false);
1936     m_buffer.GetCommandProcessor()->ClearCommands();
1937 }
1938
1939 int wxRichTextCtrl::GetNumberOfLines() const
1940 {
1941     return GetBuffer().GetParagraphCount();
1942 }
1943
1944 // ----------------------------------------------------------------------------
1945 // Positions <-> coords
1946 // ----------------------------------------------------------------------------
1947
1948 long wxRichTextCtrl::XYToPosition(long x, long y) const
1949 {
1950     return GetBuffer().XYToPosition(x, y);
1951 }
1952
1953 bool wxRichTextCtrl::PositionToXY(long pos, long *x, long *y) const
1954 {
1955     return GetBuffer().PositionToXY(pos, x, y);
1956 }
1957
1958 // ----------------------------------------------------------------------------
1959 //
1960 // ----------------------------------------------------------------------------
1961
1962 void wxRichTextCtrl::ShowPosition(long pos)
1963 {
1964     if (!IsPositionVisible(pos))
1965         ScrollIntoView(pos-1, WXK_DOWN);
1966 }
1967
1968 int wxRichTextCtrl::GetLineLength(long lineNo) const
1969 {
1970     return GetBuffer().GetParagraphLength(lineNo);
1971 }
1972
1973 wxString wxRichTextCtrl::GetLineText(long lineNo) const
1974 {
1975     return GetBuffer().GetParagraphText(lineNo);
1976 }
1977
1978 // ----------------------------------------------------------------------------
1979 // Undo/redo
1980 // ----------------------------------------------------------------------------
1981
1982 void wxRichTextCtrl::Undo()
1983 {
1984     if (CanUndo())
1985     {
1986         GetCommandProcessor()->Undo();
1987     }
1988 }
1989
1990 void wxRichTextCtrl::Redo()
1991 {
1992     if (CanRedo())
1993     {
1994         GetCommandProcessor()->Redo();
1995     }
1996 }
1997
1998 bool wxRichTextCtrl::CanUndo() const
1999 {
2000     return GetCommandProcessor()->CanUndo();
2001 }
2002
2003 bool wxRichTextCtrl::CanRedo() const
2004 {
2005     return GetCommandProcessor()->CanRedo();
2006 }
2007
2008 // ----------------------------------------------------------------------------
2009 // implemenation details
2010 // ----------------------------------------------------------------------------
2011
2012 void wxRichTextCtrl::Command(wxCommandEvent & event)
2013 {
2014     SetValue(event.GetString());
2015     GetEventHandler()->ProcessEvent(event);
2016 }
2017
2018 void wxRichTextCtrl::OnDropFiles(wxDropFilesEvent& event)
2019 {
2020     // By default, load the first file into the text window.
2021     if (event.GetNumberOfFiles() > 0)
2022     {
2023         LoadFile(event.GetFiles()[0]);
2024     }
2025 }
2026
2027 // ----------------------------------------------------------------------------
2028 // text control event processing
2029 // ----------------------------------------------------------------------------
2030
2031 bool wxRichTextCtrl::SendUpdateEvent()
2032 {
2033     wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
2034     InitCommandEvent(event);
2035
2036     return GetEventHandler()->ProcessEvent(event);
2037 }
2038
2039 void wxRichTextCtrl::InitCommandEvent(wxCommandEvent& event) const
2040 {
2041     event.SetEventObject((wxControlBase *)this);    // const_cast
2042
2043     switch ( m_clientDataType )
2044     {
2045         case wxClientData_Void:
2046             event.SetClientData(GetClientData());
2047             break;
2048
2049         case wxClientData_Object:
2050             event.SetClientObject(GetClientObject());
2051             break;
2052
2053         case wxClientData_None:
2054             // nothing to do
2055             ;
2056     }
2057 }
2058
2059
2060 wxSize wxRichTextCtrl::DoGetBestSize() const
2061 {
2062     return wxSize(10, 10);
2063 }
2064
2065 // ----------------------------------------------------------------------------
2066 // standard handlers for standard edit menu events
2067 // ----------------------------------------------------------------------------
2068
2069 void wxRichTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
2070 {
2071     Cut();
2072 }
2073
2074 void wxRichTextCtrl::OnClear(wxCommandEvent& WXUNUSED(event))
2075 {
2076     DeleteSelection();
2077 }
2078
2079 void wxRichTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
2080 {
2081     Copy();
2082 }
2083
2084 void wxRichTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
2085 {
2086     Paste();
2087 }
2088
2089 void wxRichTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
2090 {
2091     Undo();
2092 }
2093
2094 void wxRichTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
2095 {
2096     Redo();
2097 }
2098
2099 void wxRichTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
2100 {
2101     event.Enable( CanCut() );
2102 }
2103
2104 void wxRichTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
2105 {
2106     event.Enable( CanCopy() );
2107 }
2108
2109 void wxRichTextCtrl::OnUpdateClear(wxUpdateUIEvent& event)
2110 {
2111     event.Enable( CanDeleteSelection() );
2112 }
2113
2114 void wxRichTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
2115 {
2116     event.Enable( CanPaste() );
2117 }
2118
2119 void wxRichTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
2120 {
2121     event.Enable( CanUndo() );
2122     event.SetText( GetCommandProcessor()->GetUndoMenuLabel() );
2123 }
2124
2125 void wxRichTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
2126 {
2127     event.Enable( CanRedo() );
2128     event.SetText( GetCommandProcessor()->GetRedoMenuLabel() );
2129 }
2130
2131 void wxRichTextCtrl::OnSelectAll(wxCommandEvent& WXUNUSED(event))
2132 {
2133     SelectAll();
2134 }
2135
2136 void wxRichTextCtrl::OnUpdateSelectAll(wxUpdateUIEvent& event)
2137 {
2138     event.Enable(GetLastPosition() > 0);
2139 }
2140
2141 void wxRichTextCtrl::OnContextMenu(wxContextMenuEvent& WXUNUSED(event))
2142 {
2143     if (!m_contextMenu)
2144     {
2145         m_contextMenu = new wxMenu;
2146         m_contextMenu->Append(wxID_UNDO, _("&Undo"));
2147         m_contextMenu->Append(wxID_REDO, _("&Redo"));
2148         m_contextMenu->AppendSeparator();
2149         m_contextMenu->Append(wxID_CUT, _("Cu&t"));
2150         m_contextMenu->Append(wxID_COPY, _("&Copy"));
2151         m_contextMenu->Append(wxID_PASTE, _("&Paste"));
2152         m_contextMenu->Append(wxID_CLEAR, _("&Delete"));
2153         m_contextMenu->AppendSeparator();
2154         m_contextMenu->Append(wxID_SELECTALL, _("Select &All"));
2155     }
2156     PopupMenu(m_contextMenu);
2157     return;
2158 }
2159
2160 bool wxRichTextCtrl::SetStyle(long start, long end, const wxTextAttrEx& style)
2161 {
2162     return GetBuffer().SetStyle(wxRichTextRange(start, end), style);
2163 }
2164
2165 bool wxRichTextCtrl::SetStyle(const wxRichTextRange& range, const wxRichTextAttr& style)
2166 {
2167     return GetBuffer().SetStyle(range, style);
2168 }
2169
2170 bool wxRichTextCtrl::SetDefaultStyle(const wxTextAttrEx& style)
2171 {
2172     return GetBuffer().SetDefaultStyle(style);
2173 }
2174
2175 const wxTextAttrEx& wxRichTextCtrl::GetDefaultStyleEx() const
2176 {
2177     return GetBuffer().GetDefaultStyle();
2178 }
2179
2180 bool wxRichTextCtrl::GetStyle(long position, wxTextAttrEx& style) const
2181 {
2182     return GetBuffer().GetStyle(position, style);
2183 }
2184
2185 bool wxRichTextCtrl::GetStyle(long position, wxRichTextAttr& style) const
2186 {
2187     return GetBuffer().GetStyle(position, style);
2188 }
2189
2190 /// Set font, and also the buffer attributes
2191 bool wxRichTextCtrl::SetFont(const wxFont& font)
2192 {
2193 #if wxRICHTEXT_DERIVES_FROM_TEXTCTRLBASE
2194     wxControl::SetFont(font);
2195 #else
2196     wxScrolledWindow::SetFont(font);
2197 #endif
2198
2199     wxTextAttrEx attr = GetBuffer().GetAttributes();
2200     attr.SetFont(font);
2201     GetBuffer().SetBasicStyle(attr);
2202     GetBuffer().SetDefaultStyle(attr);
2203
2204     return true;
2205 }
2206
2207 /// Transform logical to physical
2208 wxPoint wxRichTextCtrl::GetPhysicalPoint(const wxPoint& ptLogical) const
2209 {
2210     wxPoint pt;
2211     CalcScrolledPosition(ptLogical.x, ptLogical.y, & pt.x, & pt.y);
2212
2213     return pt;
2214 }
2215
2216 /// Transform physical to logical
2217 wxPoint wxRichTextCtrl::GetLogicalPoint(const wxPoint& ptPhysical) const
2218 {
2219     wxPoint pt;
2220     CalcUnscrolledPosition(ptPhysical.x, ptPhysical.y, & pt.x, & pt.y);
2221
2222     return pt;
2223 }
2224
2225 /// Position the caret
2226 void wxRichTextCtrl::PositionCaret()
2227 {
2228     if (!GetCaret())
2229         return;
2230
2231     //wxLogDebug(wxT("PositionCaret"));
2232
2233     wxRect caretRect;
2234     if (GetCaretPositionForIndex(GetCaretPosition(), caretRect))
2235     {
2236         wxPoint originalPt = caretRect.GetPosition();
2237         wxPoint pt = GetPhysicalPoint(originalPt);
2238         if (GetCaret()->GetPosition() != pt)
2239         {
2240             GetCaret()->Move(pt);
2241             GetCaret()->SetSize(caretRect.GetSize());
2242         }
2243     }
2244 }
2245
2246 /// Get the caret height and position for the given character position
2247 bool wxRichTextCtrl::GetCaretPositionForIndex(long position, wxRect& rect)
2248 {
2249     wxClientDC dc(this);
2250     dc.SetFont(GetFont());
2251
2252     PrepareDC(dc);
2253
2254     wxPoint pt;
2255     int height = 0;
2256
2257     if (GetBuffer().FindPosition(dc, position, pt, & height, m_caretAtLineStart))
2258     {
2259         rect = wxRect(pt, wxSize(wxRICHTEXT_DEFAULT_CARET_WIDTH, height));
2260         return true;
2261     }
2262     else
2263         return false;
2264 }
2265
2266 /// Gets the line for the visible caret position. If the caret is
2267 /// shown at the very end of the line, it means the next character is actually
2268 /// on the following line. So let's get the line we're expecting to find
2269 /// if this is the case.
2270 wxRichTextLine* wxRichTextCtrl::GetVisibleLineForCaretPosition(long caretPosition) const
2271 {
2272     wxRichTextLine* line = GetBuffer().GetLineAtPosition(caretPosition, true);
2273     wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(caretPosition, true);
2274     if (line)
2275     {
2276         wxRichTextRange lineRange = line->GetAbsoluteRange();
2277         if (caretPosition == lineRange.GetStart()-1 &&
2278             (para->GetRange().GetStart() != lineRange.GetStart()))
2279         {
2280             if (!m_caretAtLineStart)
2281                 line = GetBuffer().GetLineAtPosition(caretPosition-1, true);
2282         }
2283     }
2284     return line;
2285 }
2286
2287
2288 /// Move the caret to the given character position
2289 bool wxRichTextCtrl::MoveCaret(long pos, bool showAtLineStart)
2290 {
2291     if (GetBuffer().GetDirty())
2292         LayoutContent();
2293
2294     if (pos <= GetBuffer().GetRange().GetEnd())
2295     {
2296         SetCaretPosition(pos, showAtLineStart);
2297
2298         PositionCaret();
2299
2300         return true;
2301     }
2302     else
2303         return false;
2304 }
2305
2306 /// Layout the buffer: which we must do before certain operations, such as
2307 /// setting the caret position.
2308 bool wxRichTextCtrl::LayoutContent(bool onlyVisibleRect)
2309 {
2310     if (GetBuffer().GetDirty() || onlyVisibleRect)
2311     {
2312         wxRect availableSpace(GetClientSize());
2313         if (availableSpace.width == 0)
2314             availableSpace.width = 10;
2315         if (availableSpace.height == 0)
2316             availableSpace.height = 10;
2317
2318         int flags = wxRICHTEXT_FIXED_WIDTH|wxRICHTEXT_VARIABLE_HEIGHT;
2319         if (onlyVisibleRect)
2320         {
2321             flags |= wxRICHTEXT_LAYOUT_SPECIFIED_RECT;
2322             availableSpace.SetPosition(GetLogicalPoint(wxPoint(0, 0)));
2323         }
2324
2325         wxClientDC dc(this);
2326         dc.SetFont(GetFont());
2327
2328         PrepareDC(dc);
2329
2330         GetBuffer().Defragment();
2331         GetBuffer().UpdateRanges();     // If items were deleted, ranges need recalculation
2332         GetBuffer().Layout(dc, availableSpace, flags);
2333         GetBuffer().SetDirty(false);
2334
2335         if (!IsFrozen())
2336             SetupScrollbars();
2337     }
2338
2339     return true;
2340 }
2341
2342 /// Is all of the selection bold?
2343 bool wxRichTextCtrl::IsSelectionBold() const
2344 {
2345     if (HasSelection())
2346     {
2347         wxRichTextAttr attr;
2348         wxRichTextRange range = GetSelectionRange();
2349         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2350         attr.SetFontWeight(wxBOLD);
2351
2352         return HasCharacterAttributes(range, attr);
2353     }
2354     else
2355     {
2356         // If no selection, then we need to combine current style with default style
2357         // to see what the effect would be if we started typing.
2358         wxRichTextAttr attr;
2359         attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2360         if (GetStyle(GetCaretPosition()+1, attr))
2361         {
2362             wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2363             return attr.GetFontWeight() == wxBOLD;
2364         }
2365     }
2366     return false;
2367 }
2368
2369 /// Is all of the selection italics?
2370 bool wxRichTextCtrl::IsSelectionItalics() const
2371 {
2372     if (HasSelection())
2373     {
2374         wxRichTextRange range = GetSelectionRange();
2375         wxRichTextAttr attr;
2376         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2377         attr.SetFontStyle(wxITALIC);
2378
2379         return HasCharacterAttributes(range, attr);
2380     }
2381     else
2382     {
2383         // If no selection, then we need to combine current style with default style
2384         // to see what the effect would be if we started typing.
2385         wxRichTextAttr attr;
2386         attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2387         if (GetStyle(GetCaretPosition()+1, attr))
2388         {
2389             wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2390             return attr.GetFontStyle() == wxITALIC;
2391         }
2392     }
2393     return false;
2394 }
2395
2396 /// Is all of the selection underlined?
2397 bool wxRichTextCtrl::IsSelectionUnderlined() const
2398 {
2399     if (HasSelection())
2400     {
2401         wxRichTextRange range = GetSelectionRange();
2402         wxRichTextAttr attr;
2403         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2404         attr.SetFontUnderlined(true);
2405
2406         return HasCharacterAttributes(range, attr);
2407     }
2408     else
2409     {
2410         // If no selection, then we need to combine current style with default style
2411         // to see what the effect would be if we started typing.
2412         wxRichTextAttr attr;
2413         attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2414         if (GetStyle(GetCaretPosition()+1, attr))
2415         {
2416             wxRichTextApplyStyle(attr, GetDefaultStyleEx());
2417             return attr.GetFontUnderlined();
2418         }
2419     }
2420     return false;
2421 }
2422
2423 /// Apply bold to the selection
2424 bool wxRichTextCtrl::ApplyBoldToSelection()
2425 {
2426     wxRichTextAttr attr;
2427     attr.SetFlags(wxTEXT_ATTR_FONT_WEIGHT);
2428     attr.SetFontWeight(IsSelectionBold() ? wxNORMAL : wxBOLD);
2429
2430     if (HasSelection())
2431         return SetStyle(GetSelectionRange(), attr);
2432     else
2433         SetDefaultStyle(attr);
2434     return true;
2435 }
2436
2437 /// Apply italic to the selection
2438 bool wxRichTextCtrl::ApplyItalicToSelection()
2439 {
2440     wxRichTextAttr attr;
2441     attr.SetFlags(wxTEXT_ATTR_FONT_ITALIC);
2442     attr.SetFontStyle(IsSelectionItalics() ? wxNORMAL : wxITALIC);
2443
2444     if (HasSelection())
2445         return SetStyle(GetSelectionRange(), attr);
2446     else
2447         SetDefaultStyle(attr);
2448     return true;
2449 }
2450
2451 /// Apply underline to the selection
2452 bool wxRichTextCtrl::ApplyUnderlineToSelection()
2453 {
2454     wxRichTextAttr attr;
2455     attr.SetFlags(wxTEXT_ATTR_FONT_UNDERLINE);
2456     attr.SetFontUnderlined(!IsSelectionUnderlined());
2457
2458     if (HasSelection())
2459         return SetStyle(GetSelectionRange(), attr);
2460     else
2461         SetDefaultStyle(attr);
2462     return true;
2463 }
2464
2465 /// Is all of the selection aligned according to the specified flag?
2466 bool wxRichTextCtrl::IsSelectionAligned(wxTextAttrAlignment alignment) const
2467 {
2468     if (HasSelection())
2469     {
2470         wxRichTextRange range = GetSelectionRange();
2471         wxRichTextAttr attr;
2472         attr.SetAlignment(alignment);
2473
2474         return HasParagraphAttributes(range, attr);
2475     }
2476     else
2477     {
2478         // If no selection, then we need to get information from the current paragraph.
2479         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2480         if (para)
2481             return para->GetAttributes().GetAlignment() == alignment;
2482     }
2483     return false;
2484 }
2485
2486 /// Apply alignment to the selection
2487 bool wxRichTextCtrl::ApplyAlignmentToSelection(wxTextAttrAlignment alignment)
2488 {
2489     wxRichTextAttr attr;
2490     attr.SetAlignment(alignment);
2491     if (HasSelection())
2492         return SetStyle(GetSelectionRange(), attr);
2493     else
2494     {
2495         wxRichTextParagraph* para = GetBuffer().GetParagraphAtPosition(GetCaretPosition()+1);
2496         if (para)
2497             return SetStyle(para->GetRange(), attr);
2498     }
2499     return true;
2500 }
2501
2502 /// Sets the default style to the style under the cursor
2503 bool wxRichTextCtrl::SetDefaultStyleToCursorStyle()
2504 {
2505     wxTextAttrEx attr;
2506     attr.SetFlags(wxTEXT_ATTR_CHARACTER);
2507
2508     if (GetStyle(GetCaretPosition(), attr))
2509     {
2510         SetDefaultStyle(attr);
2511         return true;
2512     }
2513     else
2514         return false;
2515 }
2516
2517 /// Returns the first visible position in the current view
2518 long wxRichTextCtrl::GetFirstVisiblePosition() const
2519 {
2520     wxRichTextLine* line = GetBuffer().GetLineAtYPosition(GetLogicalPoint(wxPoint(0, 0)).y);
2521     if (line)
2522         return line->GetAbsoluteRange().GetStart();
2523     else
2524         return 0;
2525 }
2526
2527 #endif
2528     // wxUSE_RICHTEXT
2529