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_IDLE(wxSplitterWindow::OnIdle)
  41     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  42
  43     EVT_SPLITTER_SASH_POS_CHANGED(-1, wxSplitterWindow::OnSashPosChanged)
  44     // NB: we borrow OnSashPosChanged for purposes of
  45     // EVT_SPLITTER_SASH_POS_CHANGING since default implementation is identical
  46     EVT_SPLITTER_SASH_POS_CHANGING(-1, wxSplitterWindow::OnSashPosChanged)
  47     EVT_SPLITTER_DCLICK(-1,           wxSplitterWindow::OnDoubleClick)
  48     EVT_SPLITTER_UNSPLIT(-1,          wxSplitterWindow::OnUnsplitEvent)
  49 END_EVENT_TABLE()
  50 #endif
  51
  52 wxSplitterWindow::wxSplitterWindow()
  53 {
  54     m_splitMode = wxSPLIT_VERTICAL;
  55     m_permitUnsplitAlways = FALSE;
  56     m_windowOne = (wxWindow *) NULL;
  57     m_windowTwo = (wxWindow *) NULL;
  58     m_dragMode = wxSPLIT_DRAG_NONE;
  59     m_oldX = 0;
  60     m_oldY = 0;
  61     m_firstX = 0;
  62     m_firstY = 0;
  63     m_sashSize = 7;
  64     m_borderSize = 2;
  65     m_sashPosition = 0;
  66     m_sashCursorWE = (wxCursor *) NULL;
  67     m_sashCursorNS = (wxCursor *) NULL;
  68     m_sashTrackerPen = (wxPen *) NULL;
  69     m_lightShadowPen = (wxPen *) NULL;
  70     m_mediumShadowPen = (wxPen *) NULL;
  71     m_darkShadowPen = (wxPen *) NULL;
  72     m_faceBrush = (wxBrush *) NULL;
  73     m_facePen = (wxPen *) NULL;
  74     m_hilightPen = (wxPen *) NULL;
  75     m_minimumPaneSize = 0;
  76     m_needUpdating = FALSE;
  77 }
  78
  79 wxSplitterWindow::wxSplitterWindow(wxWindow *parent, wxWindowID id,
  80                                    const wxPoint& pos,
  81                                    const wxSize& size,
  82                                    long style,
  83                                    const wxString& name)
  84                 : wxWindow(parent, id, pos, size, style, name)
  85 {
  86     m_splitMode = wxSPLIT_VERTICAL;
  87     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  88     m_windowOne = (wxWindow *) NULL;
  89     m_windowTwo = (wxWindow *) NULL;
  90     m_dragMode = wxSPLIT_DRAG_NONE;
  91     m_oldX = 0;
  92     m_oldY = 0;
  93     m_firstX = 0;
  94     m_firstY = 0;
  95     m_sashSize = 7;
  96     m_borderSize = 2;
  97     m_sashPosition = 0;
  98     m_minimumPaneSize = 0;
  99     m_sashCursorWE = new wxCursor(wxCURSOR_SIZEWE);
 100     m_sashCursorNS = new wxCursor(wxCURSOR_SIZENS);
 101     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
 102     m_lightShadowPen = (wxPen *) NULL;
 103     m_mediumShadowPen = (wxPen *) NULL;
 104     m_darkShadowPen = (wxPen *) NULL;
 105     m_faceBrush = (wxBrush *) NULL;
 106     m_facePen = (wxPen *) NULL;
 107     m_hilightPen = (wxPen *) NULL;
 108
 109     if ( style & wxSP_3D )
 110     {
 111         m_borderSize = 2;
 112         m_sashSize = 7;
 113     }
 114     else if ( style & wxSP_BORDER )
 115     {
 116         m_borderSize = 1;
 117         m_sashSize = 3;
 118     }
 119     else
 120     {
 121         m_borderSize = 0;
 122         m_sashSize = 3;
 123     }
 124
 125     // Eventually, we'll respond to colour change messages
 126     InitColours();
 127
 128     // For debugging purposes, to see the background.
 129 //    SetBackground(wxBLUE_BRUSH);
 130
 131     m_needUpdating = FALSE;
 132 }
 133
 134 wxSplitterWindow::~wxSplitterWindow()
 135 {
 136     delete m_sashCursorWE;
 137     delete m_sashCursorNS;
 138     delete m_sashTrackerPen;
 139     delete m_lightShadowPen;
 140     delete m_darkShadowPen;
 141     delete m_mediumShadowPen;
 142     delete m_hilightPen;
 143     delete m_facePen;
 144     delete m_faceBrush;
 145 }
 146
 147 void wxSplitterWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 148 {
 149     wxPaintDC dc(this);
 150
 151     if ( m_borderSize > 0 )
 152         DrawBorders(dc);
 153     DrawSash(dc);
 154 }
 155
 156 void wxSplitterWindow::OnIdle(wxIdleEvent& WXUNUSED(event))
 157 {
 158     if (m_needUpdating)
 159         SizeWindows();
 160 }
 161
 162 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 163 {
 164     long x = event.GetX();
 165     long y = event.GetY();
 166
 167     // reset the cursor
 168 #ifdef __WXMOTIF__
 169     SetCursor(* wxSTANDARD_CURSOR);
 170 #endif
 171 #ifdef __WXMSW__
 172     SetCursor(wxCursor());
 173 #endif
 174
 175
 176     if (event.LeftDown())
 177     {
 178         if ( SashHitTest(x, y) )
 179         {
 180             CaptureMouse();
 181
 182             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 183
 184             if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 185             {
 186                 DrawSashTracker(x, y);
 187             }
 188
 189             m_oldX = x;
 190             m_oldY = y;
 191             return;
 192         }
 193     }
 194     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 195     {
 196         // We can stop dragging now and see what we've got.
 197         m_dragMode = wxSPLIT_DRAG_NONE;
 198         ReleaseMouse();
 199
 200         // Erase old tracker
 201         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 202         {
 203             DrawSashTracker(m_oldX, m_oldY);
 204         }
 205
 206         // Obtain window size. We are only interested in the dimension the sash
 207         // splits up
 208         int w, h;
 209         GetClientSize(&w, &h);
 210         int window_size = (m_splitMode == wxSPLIT_VERTICAL ? w : h );
 211         int new_sash_position =
 212             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 213
 214         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED,
 215                                       this);
 216         eventSplitter.m_data.pos = new_sash_position;
 217         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 218         {
 219             new_sash_position = eventSplitter.GetSashPosition();
 220             if ( new_sash_position == -1 )
 221             {
 222                 // change not allowed
 223                 return;
 224             }
 225         }
 226
 227         if ( m_permitUnsplitAlways
 228                 || m_minimumPaneSize == 0 )
 229         {
 230             // Deal with possible unsplit scenarios
 231             if ( new_sash_position == 0 )
 232             {
 233                 // We remove the first window from the view
 234                 wxWindow *removedWindow = m_windowOne;
 235                 m_windowOne = m_windowTwo;
 236                 m_windowTwo = (wxWindow *) NULL;
 237                 SendUnsplitEvent(removedWindow);
 238                 m_sashPosition = 0;
 239             }
 240             else if ( new_sash_position == window_size )
 241             {
 242                 // We remove the second window from the view
 243                 wxWindow *removedWindow = m_windowTwo;
 244                 m_windowTwo = (wxWindow *) NULL;
 245                 SendUnsplitEvent(removedWindow);
 246                 m_sashPosition = 0;
 247             }
 248             else
 249             {
 250                 m_sashPosition = new_sash_position;
 251             }
 252         }
 253         else
 254         {
 255             m_sashPosition = new_sash_position;
 256         }
 257
 258         SizeWindows();
 259     }  // left up && dragging
 260     else if (event.Moving() && !event.Dragging())
 261     {
 262         // Just change the cursor if required
 263         if ( SashHitTest(x, y) )
 264         {
 265                 if ( m_splitMode == wxSPLIT_VERTICAL )
 266                 {
 267                     SetCursor(*m_sashCursorWE);
 268                 }
 269                 else
 270                 {
 271                     SetCursor(*m_sashCursorNS);
 272                 }
 273         }
 274 #ifdef __WXGTK__
 275         else
 276         {
 277             // where else do we unset the cursor?
 278             SetCursor(* wxSTANDARD_CURSOR);
 279         }
 280 #endif // __WXGTK__
 281     }
 282     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 283     {
 284         // Obtain window size. We are only interested in the dimension the sash
 285         // splits up
 286         int new_sash_position =
 287             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 288
 289         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING,
 290                                       this);
 291         eventSplitter.m_data.pos = new_sash_position;
 292         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 293         {
 294             new_sash_position = eventSplitter.GetSashPosition();
 295             if ( new_sash_position == -1 )
 296             {
 297                 // change not allowed
 298                 return;
 299             }
 300         }
 301
 302         // Erase old tracker
 303         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 304         {
 305             DrawSashTracker(m_oldX, m_oldY);
 306         }
 307
 308         if (m_splitMode == wxSPLIT_VERTICAL)
 309             x = new_sash_position;
 310         else
 311             y = new_sash_position;
 312
 313         if (new_sash_position != -1)
 314         {
 315             // Only modify if permitted
 316             m_oldX = x;
 317             m_oldY = y;
 318         }
 319
 320 #ifdef __WXMSW__
 321         // As we captured the mouse, we may get the mouse events from outside
 322         // our window - for example, negative values in x, y. This has a weird
 323         // consequence under MSW where we use unsigned values sometimes and
 324         // signed ones other times: the coordinates turn as big positive
 325         // numbers and so the sash is drawn on the *right* side of the window
 326         // instead of the left (or bottom instead of top). Correct this.
 327         if ( (short)m_oldX < 0 )
 328             m_oldX = 0;
 329         if ( (short)m_oldY < 0 )
 330             m_oldY = 0;
 331 #endif // __WXMSW__
 332
 333         // Draw new one
 334         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 335         {
 336             DrawSashTracker(m_oldX, m_oldY);
 337         }
 338         else
 339         {
 340             m_sashPosition = new_sash_position;
 341             m_needUpdating = TRUE;
 342         }
 343     }
 344     else if ( event.LeftDClick() )
 345     {
 346         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,
 347                                       this);
 348         eventSplitter.m_data.pt.x = x;
 349         eventSplitter.m_data.pt.y = y;
 350
 351         (void)GetEventHandler()->ProcessEvent(eventSplitter);
 352     }
 353 }
 354
 355 void wxSplitterWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 356 {
 357     int cw, ch;
 358     GetClientSize( &cw, &ch );
 359     if ( m_windowTwo )
 360     {
 361         if ( m_splitMode == wxSPLIT_VERTICAL )
 362         {
 363             if ( m_sashPosition >= (cw - 5) )
 364                 m_sashPosition = wxMax(10, cw - 40);
 365         }
 366         if ( m_splitMode == wxSPLIT_HORIZONTAL )
 367         {
 368             if ( m_sashPosition >= (ch - 5) )
 369                 m_sashPosition = wxMax(10, ch - 40);
 370         }
 371     }
 372     SizeWindows();
 373 }
 374
 375 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 376 {
 377     if ( m_windowTwo == NULL || m_sashPosition == 0)
 378         return FALSE; // No sash
 379
 380     if ( m_splitMode == wxSPLIT_VERTICAL )
 381     {
 382         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 383             return TRUE;
 384         else
 385             return FALSE;
 386     }
 387     else
 388     {
 389         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 390             return TRUE;
 391         else
 392             return FALSE;
 393     }
 394
 395     return FALSE;
 396 }
 397
 398 // Draw 3D effect borders
 399 void wxSplitterWindow::DrawBorders(wxDC& dc)
 400 {
 401     int w, h;
 402     GetClientSize(&w, &h);
 403
 404     if ( GetWindowStyleFlag() & wxSP_3D )
 405     {
 406         dc.SetPen(*m_mediumShadowPen);
 407         dc.DrawLine(0, 0, w-1, 0);
 408         dc.DrawLine(0, 0, 0, h - 1);
 409
 410         dc.SetPen(*m_darkShadowPen);
 411         dc.DrawLine(1, 1, w-2, 1);
 412         dc.DrawLine(1, 1, 1, h-2);
 413
 414         dc.SetPen(*m_hilightPen);
 415         dc.DrawLine(0, h-1, w-1, h-1);
 416         dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
 417                                      /// Anyway, h is required for MSW.
 418
 419         dc.SetPen(*m_lightShadowPen);
 420         dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
 421         dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
 422     }
 423     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 424     {
 425         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 426         dc.SetPen(*wxBLACK_PEN);
 427         dc.DrawRectangle(0, 0, w-1, h-1);
 428     }
 429
 430     dc.SetPen(wxNullPen);
 431     dc.SetBrush(wxNullBrush);
 432 }
 433
 434 // Draw the sash
 435 void wxSplitterWindow::DrawSash(wxDC& dc)
 436 {
 437     if ( m_sashPosition == 0 || !m_windowTwo)
 438         return;
 439
 440     int w, h;
 441     GetClientSize(&w, &h);
 442
 443     if ( GetWindowStyleFlag() & wxSP_3D )
 444     {
 445         if ( m_splitMode == wxSPLIT_VERTICAL )
 446         {
 447             dc.SetPen(*m_facePen);
 448             dc.SetBrush(*m_faceBrush);
 449             dc.DrawRectangle(m_sashPosition + 2, 0, m_sashSize - 4, h);
 450
 451             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 452
 453             dc.SetPen(*m_lightShadowPen);
 454             dc.DrawLine(m_sashPosition, 1, m_sashPosition, h-2);
 455
 456             dc.SetPen(*m_hilightPen);
 457             dc.DrawLine(m_sashPosition+1, 0, m_sashPosition+1, h);
 458
 459             dc.SetPen(*m_mediumShadowPen);
 460             dc.DrawLine(m_sashPosition+m_sashSize-2, 1, m_sashPosition+m_sashSize-2, h-1);
 461
 462             dc.SetPen(*m_darkShadowPen);
 463             dc.DrawLine(m_sashPosition+m_sashSize-1, 2, m_sashPosition+m_sashSize-1, h-2);
 464         }
 465         else
 466         {
 467             dc.SetPen(*m_facePen);
 468             dc.SetBrush(*m_faceBrush);
 469             dc.DrawRectangle(0, m_sashPosition + 2, w, m_sashSize - 4);
 470
 471             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 472
 473             dc.SetPen(*m_lightShadowPen);
 474             dc.DrawLine(1, m_sashPosition, w-2, m_sashPosition);
 475
 476             dc.SetPen(*m_hilightPen);
 477             dc.DrawLine(0, m_sashPosition+1, w, m_sashPosition+1);
 478
 479             dc.SetPen(*m_mediumShadowPen);
 480             dc.DrawLine(1, m_sashPosition+m_sashSize-2, w-1, m_sashPosition+m_sashSize-2);
 481
 482             dc.SetPen(*m_darkShadowPen);
 483             dc.DrawLine(2, m_sashPosition+m_sashSize-1, w-2, m_sashPosition+m_sashSize-1);
 484         }
 485     }
 486     else
 487     {
 488         if ( m_splitMode == wxSPLIT_VERTICAL )
 489         {
 490             dc.SetPen(*wxBLACK_PEN);
 491             dc.SetBrush(*wxBLACK_BRUSH);
 492             int h1 = h-1;
 493             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 494                 h1 += 1; // Not sure why this is necessary...
 495             dc.DrawRectangle(m_sashPosition, 0, m_sashSize, h1);
 496         }
 497         else
 498         {
 499             dc.SetPen(*wxBLACK_PEN);
 500             dc.SetBrush(*wxBLACK_BRUSH);
 501             int w1 = w-1;
 502             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 503                 w1 ++;
 504
 505             dc.DrawRectangle(0, m_sashPosition, w1, m_sashSize);
 506         }
 507
 508     }
 509
 510     dc.SetPen(wxNullPen);
 511     dc.SetBrush(wxNullBrush);
 512 }
 513
 514 // Draw the sash tracker (for whilst moving the sash)
 515 void wxSplitterWindow::DrawSashTracker(int x, int y)
 516 {
 517     int w, h;
 518     GetClientSize(&w, &h);
 519
 520     wxScreenDC screenDC;
 521     int x1, y1;
 522     int x2, y2;
 523
 524     if ( m_splitMode == wxSPLIT_VERTICAL )
 525     {
 526         x1 = x; y1 = 2;
 527         x2 = x; y2 = h-2;
 528
 529         if ( x1 > w )
 530         {
 531             x1 = w; x2 = w;
 532         }
 533         else if ( x1 < 0 )
 534         {
 535             x1 = 0; x2 = 0;
 536         }
 537     }
 538     else
 539     {
 540         x1 = 2; y1 = y;
 541         x2 = w-2; y2 = y;
 542
 543         if ( y1 > h )
 544         {
 545             y1 = h;
 546             y2 = h;
 547         }
 548         else if ( y1 < 0 )
 549         {
 550             y1 = 0;
 551             y2 = 0;
 552         }
 553     }
 554
 555     ClientToScreen(&x1, &y1);
 556     ClientToScreen(&x2, &y2);
 557
 558     screenDC.SetLogicalFunction(wxINVERT);
 559     screenDC.SetPen(*m_sashTrackerPen);
 560     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 561
 562     screenDC.DrawLine(x1, y1, x2, y2);
 563
 564     screenDC.SetLogicalFunction(wxCOPY);
 565
 566     screenDC.SetPen(wxNullPen);
 567     screenDC.SetBrush(wxNullBrush);
 568 }
 569
 570 // Position and size subwindows.
 571 // Note that the border size applies to each subwindow, not
 572 // including the edges next to the sash.
 573 void wxSplitterWindow::SizeWindows()
 574 {
 575     int w, h;
 576     GetClientSize(&w, &h);
 577
 578     if ( m_windowOne && !m_windowTwo )
 579     {
 580         m_windowOne->SetSize(m_borderSize, m_borderSize, w - 2*m_borderSize, h - 2*m_borderSize);
 581
 582         if (m_windowOne->GetAutoLayout())
 583             m_windowOne->Layout();
 584     }
 585     else if ( m_windowOne && m_windowTwo )
 586     {
 587         if (m_splitMode == wxSPLIT_VERTICAL)
 588         {
 589             int x1 = m_borderSize;
 590             int y1 = m_borderSize;
 591             int w1 = m_sashPosition - m_borderSize;
 592             int h1 = h - 2*m_borderSize;
 593
 594             int x2 = m_sashPosition + m_sashSize;
 595             int y2 = m_borderSize;
 596             int w2 = w - 2*m_borderSize - m_sashSize - w1;
 597             int h2 = h - 2*m_borderSize;
 598
 599             m_windowOne->SetSize(x1, y1, w1, h1);
 600             m_windowTwo->SetSize(x2, y2, w2, h2);
 601
 602             if (m_windowOne->GetAutoLayout())
 603                 m_windowOne->Layout();
 604             if (m_windowTwo->GetAutoLayout())
 605                 m_windowTwo->Layout();
 606         }
 607         else
 608         {
 609             m_windowOne->SetSize(m_borderSize, m_borderSize,
 610                 w - 2*m_borderSize, m_sashPosition - m_borderSize);
 611             m_windowTwo->SetSize(m_borderSize, m_sashPosition + m_sashSize,
 612                 w - 2*m_borderSize, h - 2*m_borderSize - m_sashSize - (m_sashPosition - m_borderSize));
 613
 614             if (m_windowOne->GetAutoLayout())
 615                 m_windowOne->Layout();
 616             if (m_windowTwo->GetAutoLayout())
 617                 m_windowTwo->Layout();
 618         }
 619     }
 620     wxClientDC dc(this);
 621     DrawBorders(dc);
 622     DrawSash(dc);
 623 }
 624
 625 // Set pane for unsplit window
 626 void wxSplitterWindow::Initialize(wxWindow *window)
 627 {
 628     m_windowOne = window;
 629     m_windowTwo = (wxWindow *) NULL;
 630     m_sashPosition = 0;
 631 }
 632
 633 // Associates the given window with window 2, drawing the appropriate sash
 634 // and changing the split mode.
 635 // Does nothing and returns FALSE if the window is already split.
 636 bool wxSplitterWindow::SplitVertically(wxWindow *window1, wxWindow *window2, int sashPosition)
 637 {
 638     if ( IsSplit() )
 639         return FALSE;
 640
 641     int w, h;
 642     GetClientSize(&w, &h);
 643
 644     m_splitMode = wxSPLIT_VERTICAL;
 645     m_windowOne = window1;
 646     m_windowTwo = window2;
 647     if ( sashPosition > 0 )
 648         m_sashPosition = sashPosition;
 649     else if ( sashPosition < 0 )
 650         m_sashPosition = w - sashPosition;
 651     else    // default
 652         m_sashPosition = w/2;
 653
 654     SizeWindows();
 655
 656     return TRUE;
 657 }
 658
 659 bool wxSplitterWindow::SplitHorizontally(wxWindow *window1, wxWindow *window2, int sashPosition)
 660 {
 661     if ( IsSplit() )
 662         return FALSE;
 663
 664     int w, h;
 665     GetClientSize(&w, &h);
 666
 667     m_splitMode = wxSPLIT_HORIZONTAL;
 668     m_windowOne = window1;
 669     m_windowTwo = window2;
 670     if ( sashPosition > 0 )
 671         m_sashPosition = sashPosition;
 672     else if ( sashPosition < 0 )
 673         m_sashPosition = h - sashPosition;
 674     else    // default
 675         m_sashPosition = h/2;
 676
 677     SizeWindows();
 678
 679     return TRUE;
 680 }
 681
 682
 683 // Remove the specified (or second) window from the view
 684 // Doesn't actually delete the window.
 685 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 686 {
 687     if ( ! IsSplit() )
 688         return FALSE;
 689
 690     wxWindow *win = NULL;
 691     if ( toRemove == NULL || toRemove == m_windowTwo)
 692     {
 693         win = m_windowTwo ;
 694         m_windowTwo = (wxWindow *) NULL;
 695     }
 696     else if ( toRemove == m_windowOne )
 697     {
 698         win = m_windowOne ;
 699         m_windowOne = m_windowTwo;
 700         m_windowTwo = (wxWindow *) NULL;
 701     }
 702     else
 703     {
 704         wxFAIL_MSG(_T("splitter: attempt to remove a non-existent window"));
 705
 706         return FALSE;
 707     }
 708
 709     SendUnsplitEvent(win);
 710     m_sashPosition = 0;
 711     SizeWindows();
 712
 713     return TRUE;
 714 }
 715
 716 // Replace a window with another one
 717 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 718 {
 719     wxCHECK_MSG( winOld, FALSE, _T("use one of Split() functions instead") );
 720     wxCHECK_MSG( winNew, FALSE, _T("use Unsplit() functions instead") );
 721
 722     if ( winOld == m_windowTwo )
 723     {
 724         m_windowTwo = winNew;
 725     }
 726     else if ( winOld == m_windowOne )
 727     {
 728         m_windowOne = winNew;
 729     }
 730     else
 731     {
 732         wxFAIL_MSG(_T("splitter: attempt to replace a non-existent window"));
 733
 734         return FALSE;
 735     }
 736
 737     SizeWindows();
 738
 739     return TRUE;
 740 }
 741
 742 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 743 {
 744     m_sashPosition = position;
 745
 746     if ( redraw )
 747     {
 748         SizeWindows();
 749     }
 750 }
 751
 752 // Initialize colours
 753 void wxSplitterWindow::InitColours()
 754 {
 755     wxDELETE( m_facePen );
 756     wxDELETE( m_faceBrush );
 757     wxDELETE( m_mediumShadowPen );
 758     wxDELETE( m_darkShadowPen );
 759     wxDELETE( m_lightShadowPen );
 760     wxDELETE( m_hilightPen );
 761
 762     // Shadow colours
 763 #if defined(__WIN95__)
 764     wxColour faceColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 765     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 766     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 767
 768     wxColour mediumShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW));
 769     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 770
 771     wxColour darkShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW));
 772     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 773
 774     wxColour lightShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT));
 775     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 776
 777     wxColour hilightColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT));
 778     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 779 #else // !Win32
 780     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 781     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 782     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 783     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 784     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 785     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 786 #endif // Win32/!Win32
 787 }
 788
 789 void wxSplitterWindow::SendUnsplitEvent(wxWindow *winRemoved)
 790 {
 791     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 792     event.m_data.win = winRemoved;
 793
 794     (void)GetEventHandler()->ProcessEvent(event);
 795 }
 796
 797 // ---------------------------------------------------------------------------
 798 // splitter event handlers
 799 // ---------------------------------------------------------------------------
 800
 801 void wxSplitterWindow::OnSashPosChanged(wxSplitterEvent& event)
 802 {
 803     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 804     const int UNSPLIT_THRESHOLD = 4;
 805
 806     int newSashPosition = event.GetSashPosition();
 807
 808     // Obtain relevant window dimension for bottom / right threshold check
 809     int w, h;
 810     GetClientSize(&w, &h);
 811     int window_size = (m_splitMode == wxSPLIT_VERTICAL) ? w : h ;
 812
 813     bool unsplit_scenario = FALSE;
 814     if ( m_permitUnsplitAlways
 815             || m_minimumPaneSize == 0 )
 816     {
 817         // Do edge detection if unsplit premitted
 818         if ( newSashPosition <= UNSPLIT_THRESHOLD )
 819         {
 820             // threshold top / left check
 821             newSashPosition = 0;
 822             unsplit_scenario = TRUE;
 823         }
 824         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
 825         {
 826             // threshold bottom/right check
 827             newSashPosition = window_size;
 828             unsplit_scenario = TRUE;
 829         }
 830     }
 831
 832     if ( !unsplit_scenario )
 833     {
 834         // If resultant pane would be too small, enlarge it
 835         if ( newSashPosition < m_minimumPaneSize )
 836             newSashPosition = m_minimumPaneSize;
 837         if ( newSashPosition > window_size - m_minimumPaneSize )
 838             newSashPosition = window_size - m_minimumPaneSize;
 839     }
 840
 841     // If the result is out of bounds it means minimum size is too big,
 842     // so split window in half as best compromise.
 843     if ( newSashPosition < 0 || newSashPosition > window_size )
 844         newSashPosition = window_size / 2;
 845
 846     // for compatibility, call the virtual function
 847     if ( !OnSashPositionChange(newSashPosition) )
 848     {
 849         newSashPosition = -1;
 850     }
 851
 852     event.SetSashPosition(newSashPosition);
 853 }
 854
 855 // Called when the sash is double-clicked. The default behaviour is to remove
 856 // the sash if the minimum pane size is zero.
 857 void wxSplitterWindow::OnDoubleClick(wxSplitterEvent& event)
 858 {
 859     // for compatibility, call the virtual function
 860     OnDoubleClickSash(event.GetX(), event.GetY());
 861
 862     if ( GetMinimumPaneSize() == 0
 863         || m_permitUnsplitAlways)
 864     {
 865         Unsplit();
 866     }
 867 }
 868
 869 void wxSplitterWindow::OnUnsplitEvent(wxSplitterEvent& event)
 870 {
 871     wxWindow *win = event.GetWindowBeingRemoved();
 872
 873     // for compatibility, call the virtual function
 874     OnUnsplit(win);
 875
 876     win->Show(FALSE);
 877 }