src/generic/splitter.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        splitter.cpp
   3 // Purpose:     wxSplitterWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "splitter.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/wx.h"
  25 #endif
  26
  27 #include <stdlib.h>
  28
  29 #include "wx/string.h"
  30 #include "wx/splitter.h"
  31 #include "wx/dcscreen.h"
  32
  33 #if !USE_SHARED_LIBRARY
  34 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  35 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxCommandEvent)
  36
  37 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  38     EVT_PAINT(wxSplitterWindow::OnPaint)
  39     EVT_SIZE(wxSplitterWindow::OnSize)
  40     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  41
  42     EVT_SPLITTER_SASH_POS_CHANGED(-1, wxSplitterWindow::OnSashPosChanged)
  43     EVT_SPLITTER_DCLICK(-1,           wxSplitterWindow::OnDoubleClick)
  44     EVT_SPLITTER_UNSPLIT(-1,          wxSplitterWindow::OnUnsplitEvent)
  45 END_EVENT_TABLE()
  46 #endif
  47
  48 wxSplitterWindow::wxSplitterWindow()
  49 {
  50     m_splitMode = wxSPLIT_VERTICAL;
  51     m_windowOne = (wxWindow *) NULL;
  52     m_windowTwo = (wxWindow *) NULL;
  53     m_dragMode = wxSPLIT_DRAG_NONE;
  54     m_oldX = 0;
  55     m_oldY = 0;
  56     m_firstX = 0;
  57     m_firstY = 0;
  58     m_sashSize = 7;
  59     m_borderSize = 2;
  60     m_sashPosition = 0;
  61     m_sashCursorWE = (wxCursor *) NULL;
  62     m_sashCursorNS = (wxCursor *) NULL;
  63     m_sashTrackerPen = (wxPen *) NULL;
  64     m_lightShadowPen = (wxPen *) NULL;
  65     m_mediumShadowPen = (wxPen *) NULL;
  66     m_darkShadowPen = (wxPen *) NULL;
  67     m_faceBrush = (wxBrush *) NULL;
  68     m_facePen = (wxPen *) NULL;
  69     m_hilightPen = (wxPen *) NULL;
  70     m_minimumPaneSize = 0;
  71 }
  72
  73 wxSplitterWindow::wxSplitterWindow(wxWindow *parent, wxWindowID id,
  74                                    const wxPoint& pos,
  75                                    const wxSize& size,
  76                                    long style,
  77                                    const wxString& name)
  78                 : wxWindow(parent, id, pos, size, style, name)
  79 {
  80     m_splitMode = wxSPLIT_VERTICAL;
  81     m_windowOne = (wxWindow *) NULL;
  82     m_windowTwo = (wxWindow *) NULL;
  83     m_dragMode = wxSPLIT_DRAG_NONE;
  84     m_oldX = 0;
  85     m_oldY = 0;
  86     m_firstX = 0;
  87     m_firstY = 0;
  88     m_sashSize = 7;
  89     m_borderSize = 2;
  90     m_sashPosition = 0;
  91     m_minimumPaneSize = 0;
  92     m_sashCursorWE = new wxCursor(wxCURSOR_SIZEWE);
  93     m_sashCursorNS = new wxCursor(wxCURSOR_SIZENS);
  94     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
  95     m_lightShadowPen = (wxPen *) NULL;
  96     m_mediumShadowPen = (wxPen *) NULL;
  97     m_darkShadowPen = (wxPen *) NULL;
  98     m_faceBrush = (wxBrush *) NULL;
  99     m_facePen = (wxPen *) NULL;
 100     m_hilightPen = (wxPen *) NULL;
 101
 102     if ( style & wxSP_3D )
 103     {
 104         m_borderSize = 2;
 105         m_sashSize = 7;
 106     }
 107     else if ( style & wxSP_BORDER )
 108     {
 109         m_borderSize = 1;
 110         m_sashSize = 3;
 111     }
 112     else
 113     {
 114         m_borderSize = 0;
 115         m_sashSize = 3;
 116     }
 117
 118     // Eventually, we'll respond to colour change messages
 119     InitColours();
 120
 121     // For debugging purposes, to see the background.
 122 //    SetBackground(wxBLUE_BRUSH);
 123 }
 124
 125 wxSplitterWindow::~wxSplitterWindow()
 126 {
 127     delete m_sashCursorWE;
 128     delete m_sashCursorNS;
 129     delete m_sashTrackerPen;
 130     delete m_lightShadowPen;
 131     delete m_darkShadowPen;
 132     delete m_mediumShadowPen;
 133     delete m_hilightPen;
 134     delete m_facePen;
 135     delete m_faceBrush;
 136 }
 137
 138 void wxSplitterWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 139 {
 140     wxPaintDC dc(this);
 141
 142     if ( m_borderSize > 0 )
 143         DrawBorders(dc);
 144     DrawSash(dc);
 145 }
 146
 147
 148 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 149 {
 150     long x = event.GetX();
 151     long y = event.GetY();
 152
 153     // reset the cursor
 154 #ifdef __WXMOTIF__
 155     SetCursor(* wxSTANDARD_CURSOR);
 156 #endif
 157 #ifdef __WXMSW__
 158     SetCursor(wxCursor());
 159 #endif
 160
 161     // under wxGTK the method above causes the mouse
 162     // to flicker so we set the standard cursor only
 163     // when leaving the window and when moving over
 164     // non-sash parts of the window. this should work
 165     // on the other platforms as well, but who knows.
 166 #ifdef __WXGTK__
 167     if (event.Leaving())
 168         SetCursor(* wxSTANDARD_CURSOR);
 169 #endif
 170
 171     if (event.LeftDown())
 172     {
 173         if ( SashHitTest(x, y) )
 174         {
 175             CaptureMouse();
 176
 177             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 178
 179             DrawSashTracker(x, y);
 180             m_oldX = x;
 181             m_oldY = y;
 182             return;
 183         }
 184     }
 185     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 186     {
 187         // We can stop dragging now and see what we've got.
 188         m_dragMode = wxSPLIT_DRAG_NONE;
 189         ReleaseMouse();
 190
 191         // Erase old tracker
 192         DrawSashTracker(m_oldX, m_oldY);
 193
 194         // Obtain window size. We are only interested in the dimension the sash
 195         // splits up
 196         int w, h;
 197         GetClientSize(&w, &h);
 198         int window_size = (m_splitMode == wxSPLIT_VERTICAL ? w : h );
 199         int new_sash_position =
 200             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 201
 202         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED,
 203                                       this);
 204         eventSplitter.m_data.pos = new_sash_position;
 205         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 206         {
 207             new_sash_position = eventSplitter.GetSashPosition();
 208             if ( new_sash_position == -1 )
 209             {
 210                 // change not allowed
 211                 return;
 212             }
 213         }
 214
 215         if ( new_sash_position == 0 )
 216         {
 217             // We remove the first window from the view
 218             wxWindow *removedWindow = m_windowOne;
 219             m_windowOne = m_windowTwo;
 220             m_windowTwo = (wxWindow *) NULL;
 221             SendUnsplitEvent(removedWindow);
 222             m_sashPosition = 0;
 223         }
 224         else if ( new_sash_position == window_size )
 225         {
 226             // We remove the second window from the view
 227             wxWindow *removedWindow = m_windowTwo;
 228             m_windowTwo = (wxWindow *) NULL;
 229             SendUnsplitEvent(removedWindow);
 230             m_sashPosition = 0;
 231         }
 232         else
 233         {
 234             m_sashPosition = new_sash_position;
 235         }
 236
 237         SizeWindows();
 238     }  // left up && dragging
 239     else if (event.Moving() && !event.Dragging())
 240     {
 241         // Just change the cursor if required
 242         if ( SashHitTest(x, y) )
 243         {
 244                 if ( m_splitMode == wxSPLIT_VERTICAL )
 245                 {
 246                     SetCursor(*m_sashCursorWE);
 247                 }
 248                 else
 249                 {
 250                     SetCursor(*m_sashCursorNS);
 251                 }
 252         }
 253 #ifdef __WXGTK__
 254         else
 255         {
 256             // where else do we unset the cursor?
 257             SetCursor(* wxSTANDARD_CURSOR);
 258         }
 259 #endif // __WXGTK__
 260     }
 261     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 262     {
 263         // Erase old tracker
 264         DrawSashTracker(m_oldX, m_oldY);
 265
 266         // Draw new one
 267         DrawSashTracker(x, y);
 268
 269         m_oldX = x;
 270         m_oldY = y;
 271     }
 272     else if ( event.LeftDClick() )
 273     {
 274         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,
 275                                       this);
 276         eventSplitter.m_data.pt.x = x;
 277         eventSplitter.m_data.pt.y = y;
 278
 279         (void)GetEventHandler()->ProcessEvent(eventSplitter);
 280     }
 281 }
 282
 283 void wxSplitterWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 284 {
 285     int cw, ch;
 286     GetClientSize( &cw, &ch );
 287     if ( m_windowTwo )
 288     {
 289         if ( m_splitMode == wxSPLIT_VERTICAL )
 290         {
 291             if ( m_sashPosition >= (cw - 5) )
 292                 m_sashPosition = wxMax(10, cw - 40);
 293         }
 294         if ( m_splitMode == wxSPLIT_HORIZONTAL )
 295         {
 296             if ( m_sashPosition >= (ch - 5) )
 297                 m_sashPosition = wxMax(10, ch - 40);
 298         }
 299     }
 300     SizeWindows();
 301 }
 302
 303 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 304 {
 305     if ( m_windowTwo == NULL || m_sashPosition == 0)
 306         return FALSE; // No sash
 307
 308     if ( m_splitMode == wxSPLIT_VERTICAL )
 309     {
 310         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 311             return TRUE;
 312         else
 313             return FALSE;
 314     }
 315     else
 316     {
 317         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 318             return TRUE;
 319         else
 320             return FALSE;
 321     }
 322
 323     return FALSE;
 324 }
 325
 326 // Draw 3D effect borders
 327 void wxSplitterWindow::DrawBorders(wxDC& dc)
 328 {
 329     int w, h;
 330     GetClientSize(&w, &h);
 331
 332     if ( GetWindowStyleFlag() & wxSP_3D )
 333     {
 334         dc.SetPen(*m_mediumShadowPen);
 335         dc.DrawLine(0, 0, w-1, 0);
 336         dc.DrawLine(0, 0, 0, h - 1);
 337
 338         dc.SetPen(*m_darkShadowPen);
 339         dc.DrawLine(1, 1, w-2, 1);
 340         dc.DrawLine(1, 1, 1, h-2);
 341
 342         dc.SetPen(*m_hilightPen);
 343         dc.DrawLine(0, h-1, w-1, h-1);
 344         dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
 345                                      /// Anyway, h is required for MSW.
 346
 347         dc.SetPen(*m_lightShadowPen);
 348         dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
 349         dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
 350     }
 351     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 352     {
 353         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 354         dc.SetPen(*wxBLACK_PEN);
 355         dc.DrawRectangle(0, 0, w-1, h-1);
 356     }
 357
 358     dc.SetPen(wxNullPen);
 359     dc.SetBrush(wxNullBrush);
 360 }
 361
 362 // Draw the sash
 363 void wxSplitterWindow::DrawSash(wxDC& dc)
 364 {
 365     if ( m_sashPosition == 0 || !m_windowTwo)
 366         return;
 367
 368     int w, h;
 369     GetClientSize(&w, &h);
 370
 371     if ( GetWindowStyleFlag() & wxSP_3D )
 372     {
 373         if ( m_splitMode == wxSPLIT_VERTICAL )
 374         {
 375             dc.SetPen(*m_facePen);
 376             dc.SetBrush(*m_faceBrush);
 377             dc.DrawRectangle(m_sashPosition + 2, 0, m_sashSize - 4, h);
 378
 379             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 380
 381             dc.SetPen(*m_lightShadowPen);
 382             dc.DrawLine(m_sashPosition, 1, m_sashPosition, h-2);
 383
 384             dc.SetPen(*m_hilightPen);
 385             dc.DrawLine(m_sashPosition+1, 0, m_sashPosition+1, h);
 386
 387             dc.SetPen(*m_mediumShadowPen);
 388             dc.DrawLine(m_sashPosition+m_sashSize-2, 1, m_sashPosition+m_sashSize-2, h-1);
 389
 390             dc.SetPen(*m_darkShadowPen);
 391             dc.DrawLine(m_sashPosition+m_sashSize-1, 2, m_sashPosition+m_sashSize-1, h-2);
 392         }
 393         else
 394         {
 395             dc.SetPen(*m_facePen);
 396             dc.SetBrush(*m_faceBrush);
 397             dc.DrawRectangle(0, m_sashPosition + 2, w, m_sashSize - 4);
 398
 399             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 400
 401             dc.SetPen(*m_lightShadowPen);
 402             dc.DrawLine(1, m_sashPosition, w-2, m_sashPosition);
 403
 404             dc.SetPen(*m_hilightPen);
 405             dc.DrawLine(0, m_sashPosition+1, w, m_sashPosition+1);
 406
 407             dc.SetPen(*m_mediumShadowPen);
 408             dc.DrawLine(1, m_sashPosition+m_sashSize-2, w-1, m_sashPosition+m_sashSize-2);
 409
 410             dc.SetPen(*m_darkShadowPen);
 411             dc.DrawLine(2, m_sashPosition+m_sashSize-1, w-2, m_sashPosition+m_sashSize-1);
 412         }
 413     }
 414     else
 415     {
 416         if ( m_splitMode == wxSPLIT_VERTICAL )
 417         {
 418             dc.SetPen(*wxBLACK_PEN);
 419             dc.SetBrush(*wxBLACK_BRUSH);
 420             int h1 = h-1;
 421             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 422                 h1 += 1; // Not sure why this is necessary...
 423             dc.DrawRectangle(m_sashPosition, 0, m_sashSize, h1);
 424         }
 425         else
 426         {
 427             dc.SetPen(*wxBLACK_PEN);
 428             dc.SetBrush(*wxBLACK_BRUSH);
 429             int w1 = w-1;
 430             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 431                 w1 ++;
 432
 433             dc.DrawRectangle(0, m_sashPosition, w1, m_sashSize);
 434         }
 435
 436     }
 437
 438     dc.SetPen(wxNullPen);
 439     dc.SetBrush(wxNullBrush);
 440 }
 441
 442 // Draw the sash tracker (for whilst moving the sash)
 443 void wxSplitterWindow::DrawSashTracker(int x, int y)
 444 {
 445     int w, h;
 446     GetClientSize(&w, &h);
 447
 448     wxScreenDC screenDC;
 449     int x1, y1;
 450     int x2, y2;
 451
 452     if ( m_splitMode == wxSPLIT_VERTICAL )
 453     {
 454         x1 = x; y1 = 2;
 455         x2 = x; y2 = h-2;
 456
 457         if ( x1 > w )
 458         {
 459             x1 = w; x2 = w;
 460         }
 461         else if ( x1 < 0 )
 462         {
 463             x1 = 0; x2 = 0;
 464         }
 465     }
 466     else
 467     {
 468         x1 = 2; y1 = y;
 469         x2 = w-2; y2 = y;
 470
 471         if ( y1 > h )
 472         {
 473             y1 = h;
 474             y2 = h;
 475         }
 476         else if ( y1 < 0 )
 477         {
 478             y1 = 0;
 479             y2 = 0;
 480         }
 481     }
 482
 483     ClientToScreen(&x1, &y1);
 484     ClientToScreen(&x2, &y2);
 485
 486     screenDC.SetLogicalFunction(wxXOR);
 487     screenDC.SetPen(*m_sashTrackerPen);
 488     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 489
 490     screenDC.DrawLine(x1, y1, x2, y2);
 491
 492     screenDC.SetLogicalFunction(wxCOPY);
 493
 494     screenDC.SetPen(wxNullPen);
 495     screenDC.SetBrush(wxNullBrush);
 496 }
 497
 498 // Position and size subwindows.
 499 // Note that the border size applies to each subwindow, not
 500 // including the edges next to the sash.
 501 void wxSplitterWindow::SizeWindows()
 502 {
 503     int w, h;
 504     GetClientSize(&w, &h);
 505
 506     if ( m_windowOne && !m_windowTwo )
 507     {
 508         m_windowOne->SetSize(m_borderSize, m_borderSize, w - 2*m_borderSize, h - 2*m_borderSize);
 509
 510         if (m_windowOne->GetAutoLayout())
 511             m_windowOne->Layout();
 512     }
 513     else if ( m_windowOne && m_windowTwo )
 514     {
 515         if (m_splitMode == wxSPLIT_VERTICAL)
 516         {
 517             int x1 = m_borderSize;
 518             int y1 = m_borderSize;
 519             int w1 = m_sashPosition - m_borderSize;
 520             int h1 = h - 2*m_borderSize;
 521
 522             int x2 = m_sashPosition + m_sashSize;
 523             int y2 = m_borderSize;
 524             int w2 = w - 2*m_borderSize - m_sashSize - w1;
 525             int h2 = h - 2*m_borderSize;
 526
 527             m_windowOne->SetSize(x1, y1, w1, h1);
 528             m_windowTwo->SetSize(x2, y2, w2, h2);
 529
 530             if (m_windowOne->GetAutoLayout())
 531                 m_windowOne->Layout();
 532             if (m_windowTwo->GetAutoLayout())
 533                 m_windowTwo->Layout();
 534         }
 535         else
 536         {
 537             m_windowOne->SetSize(m_borderSize, m_borderSize,
 538                 w - 2*m_borderSize, m_sashPosition - m_borderSize);
 539             m_windowTwo->SetSize(m_borderSize, m_sashPosition + m_sashSize,
 540                 w - 2*m_borderSize, h - 2*m_borderSize - m_sashSize - (m_sashPosition - m_borderSize));
 541
 542             if (m_windowOne->GetAutoLayout())
 543                 m_windowOne->Layout();
 544             if (m_windowTwo->GetAutoLayout())
 545                 m_windowTwo->Layout();
 546         }
 547     }
 548     wxClientDC dc(this);
 549     DrawBorders(dc);
 550     DrawSash(dc);
 551 }
 552
 553 // Set pane for unsplit window
 554 void wxSplitterWindow::Initialize(wxWindow *window)
 555 {
 556     m_windowOne = window;
 557     m_windowTwo = (wxWindow *) NULL;
 558     m_sashPosition = 0;
 559 }
 560
 561 // Associates the given window with window 2, drawing the appropriate sash
 562 // and changing the split mode.
 563 // Does nothing and returns FALSE if the window is already split.
 564 bool wxSplitterWindow::SplitVertically(wxWindow *window1, wxWindow *window2, int sashPosition)
 565 {
 566     if ( IsSplit() )
 567         return FALSE;
 568
 569     int w, h;
 570     GetClientSize(&w, &h);
 571
 572     m_splitMode = wxSPLIT_VERTICAL;
 573     m_windowOne = window1;
 574     m_windowTwo = window2;
 575     if ( sashPosition > 0 )
 576         m_sashPosition = sashPosition;
 577     else if ( sashPosition < 0 )
 578         m_sashPosition = w - sashPosition;
 579     else    // default
 580         m_sashPosition = w/2;
 581
 582     SizeWindows();
 583
 584     return TRUE;
 585 }
 586
 587 bool wxSplitterWindow::SplitHorizontally(wxWindow *window1, wxWindow *window2, int sashPosition)
 588 {
 589     if ( IsSplit() )
 590         return FALSE;
 591
 592     int w, h;
 593     GetClientSize(&w, &h);
 594
 595     m_splitMode = wxSPLIT_HORIZONTAL;
 596     m_windowOne = window1;
 597     m_windowTwo = window2;
 598     if ( sashPosition > 0 )
 599         m_sashPosition = sashPosition;
 600     else if ( sashPosition < 0 )
 601         m_sashPosition = h - sashPosition;
 602     else    // default
 603         m_sashPosition = h/2;
 604
 605     SizeWindows();
 606
 607     return TRUE;
 608 }
 609
 610
 611 // Remove the specified (or second) window from the view
 612 // Doesn't actually delete the window.
 613 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 614 {
 615     if ( ! IsSplit() )
 616         return FALSE;
 617
 618     wxWindow *win = NULL;
 619     if ( toRemove == NULL || toRemove == m_windowTwo)
 620     {
 621         win = m_windowTwo ;
 622         m_windowTwo = (wxWindow *) NULL;
 623     }
 624     else if ( toRemove == m_windowOne )
 625     {
 626         win = m_windowOne ;
 627         m_windowOne = m_windowTwo;
 628         m_windowTwo = (wxWindow *) NULL;
 629     }
 630     else
 631     {
 632         wxFAIL_MSG(_T("splitter: attempt to remove a non-existent window"));
 633
 634         return FALSE;
 635     }
 636
 637     SendUnsplitEvent(win);
 638     m_sashPosition = 0;
 639     SizeWindows();
 640
 641     return TRUE;
 642 }
 643
 644 // Replace a window with another one
 645 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 646 {
 647     wxCHECK_MSG( winOld, FALSE, _T("use one of Split() functions instead") );
 648     wxCHECK_MSG( winNew, FALSE, _T("use Unsplit() functions instead") );
 649
 650     if ( winOld == m_windowTwo )
 651     {
 652         m_windowTwo = winNew;
 653     }
 654     else if ( winOld == m_windowOne )
 655     {
 656         m_windowOne = winNew;
 657     }
 658     else
 659     {
 660         wxFAIL_MSG(_T("splitter: attempt to replace a non-existent window"));
 661
 662         return FALSE;
 663     }
 664
 665     SizeWindows();
 666
 667     return TRUE;
 668 }
 669
 670 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 671 {
 672     m_sashPosition = position;
 673
 674     if ( redraw )
 675     {
 676         SizeWindows();
 677     }
 678 }
 679
 680 // Initialize colours
 681 void wxSplitterWindow::InitColours()
 682 {
 683     wxDELETE( m_facePen );
 684     wxDELETE( m_faceBrush );
 685     wxDELETE( m_mediumShadowPen );
 686     wxDELETE( m_darkShadowPen );
 687     wxDELETE( m_lightShadowPen );
 688     wxDELETE( m_hilightPen );
 689
 690     // Shadow colours
 691 #if defined(__WIN95__)
 692     wxColour faceColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 693     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 694     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 695
 696     wxColour mediumShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW));
 697     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 698
 699     wxColour darkShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW));
 700     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 701
 702     wxColour lightShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT));
 703     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 704
 705     wxColour hilightColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT));
 706     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 707 #else // !Win32
 708     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 709     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 710     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 711     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 712     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 713     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 714 #endif // Win32/!Win32
 715 }
 716
 717 void wxSplitterWindow::SendUnsplitEvent(wxWindow *winRemoved)
 718 {
 719     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 720     event.m_data.win = winRemoved;
 721
 722     (void)GetEventHandler()->ProcessEvent(event);
 723 }
 724
 725 // ---------------------------------------------------------------------------
 726 // splitter event handlers
 727 // ---------------------------------------------------------------------------
 728
 729 void wxSplitterWindow::OnSashPosChanged(wxSplitterEvent& event)
 730 {
 731     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 732     const int UNSPLIT_THRESHOLD = 4;
 733
 734     int newSashPosition = event.GetSashPosition();
 735
 736     // Obtain relevant window dimension for bottom / right threshold check
 737     int w, h;
 738     GetClientSize(&w, &h);
 739     int window_size = (m_splitMode == wxSPLIT_VERTICAL) ? w : h ;
 740
 741     if ( newSashPosition <= UNSPLIT_THRESHOLD )
 742     {
 743         // threshold top / left check
 744         newSashPosition = 0;
 745     }
 746     else if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
 747     {
 748         // threshold bottom/right check
 749         newSashPosition = window_size;
 750     }
 751
 752     // If resultant pane would be too small, enlarge it.
 753
 754     // Check upper / left pane
 755     if ( newSashPosition < m_minimumPaneSize )
 756         newSashPosition = m_minimumPaneSize;
 757
 758     // Check lower / right pane (check even if sash was just adjusted)
 759     if ( newSashPosition > window_size - m_minimumPaneSize )
 760         newSashPosition = window_size - m_minimumPaneSize;
 761
 762     // If the result is out of bounds it means minimum size is too big,
 763     // so split window in half as best compromise.
 764     if ( newSashPosition < 0 || newSashPosition > window_size )
 765         newSashPosition = window_size / 2;
 766
 767     // for compatibility, call the virtual function
 768     if ( !OnSashPositionChange(newSashPosition) )
 769     {
 770         newSashPosition = -1;
 771     }
 772
 773     event.SetSashPosition(newSashPosition);
 774 }
 775
 776 // Called when the sash is double-clicked. The default behaviour is to remove
 777 // the sash if the minimum pane size is zero.
 778 void wxSplitterWindow::OnDoubleClick(wxSplitterEvent& event)
 779 {
 780     // for compatibility, call the virtual function
 781     OnDoubleClickSash(event.GetX(), event.GetY());
 782
 783     if ( GetMinimumPaneSize() == 0 )
 784     {
 785         Unsplit();
 786     }
 787 }
 788
 789 void wxSplitterWindow::OnUnsplitEvent(wxSplitterEvent& event)
 790 {
 791     wxWindow *win = event.GetWindowBeingRemoved();
 792
 793     // for compatibility, call the virtual function
 794     OnUnsplit(win);
 795
 796     win->Show(FALSE);
 797 }