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 #ifdef __WXMSW__
 267         // As we captured the mouse, we may get the mouse events from outside
 268         // our window - for example, negative values in x, y. This has a weird
 269         // consequence under MSW where we use unsigned values sometimes and
 270         // signed ones other times: the coordinates turn as big positive
 271         // numbers and so the sash is drawn on the *right* side of the window
 272         // instead of the left (or bottom instead of top). Correct this.
 273         m_oldX = x;
 274         m_oldY = y;
 275
 276         if ( (short)m_oldX < 0 )
 277             m_oldX = 0;
 278         if ( (short)m_oldY < 0 )
 279             m_oldY = 0;
 280 #endif // __WXMSW__
 281
 282         // Draw new one
 283         DrawSashTracker(m_oldX, m_oldY);
 284     }
 285     else if ( event.LeftDClick() )
 286     {
 287         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,
 288                                       this);
 289         eventSplitter.m_data.pt.x = x;
 290         eventSplitter.m_data.pt.y = y;
 291
 292         (void)GetEventHandler()->ProcessEvent(eventSplitter);
 293     }
 294 }
 295
 296 void wxSplitterWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 297 {
 298     int cw, ch;
 299     GetClientSize( &cw, &ch );
 300     if ( m_windowTwo )
 301     {
 302         if ( m_splitMode == wxSPLIT_VERTICAL )
 303         {
 304             if ( m_sashPosition >= (cw - 5) )
 305                 m_sashPosition = wxMax(10, cw - 40);
 306         }
 307         if ( m_splitMode == wxSPLIT_HORIZONTAL )
 308         {
 309             if ( m_sashPosition >= (ch - 5) )
 310                 m_sashPosition = wxMax(10, ch - 40);
 311         }
 312     }
 313     SizeWindows();
 314 }
 315
 316 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 317 {
 318     if ( m_windowTwo == NULL || m_sashPosition == 0)
 319         return FALSE; // No sash
 320
 321     if ( m_splitMode == wxSPLIT_VERTICAL )
 322     {
 323         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 324             return TRUE;
 325         else
 326             return FALSE;
 327     }
 328     else
 329     {
 330         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 331             return TRUE;
 332         else
 333             return FALSE;
 334     }
 335
 336     return FALSE;
 337 }
 338
 339 // Draw 3D effect borders
 340 void wxSplitterWindow::DrawBorders(wxDC& dc)
 341 {
 342     int w, h;
 343     GetClientSize(&w, &h);
 344
 345     if ( GetWindowStyleFlag() & wxSP_3D )
 346     {
 347         dc.SetPen(*m_mediumShadowPen);
 348         dc.DrawLine(0, 0, w-1, 0);
 349         dc.DrawLine(0, 0, 0, h - 1);
 350
 351         dc.SetPen(*m_darkShadowPen);
 352         dc.DrawLine(1, 1, w-2, 1);
 353         dc.DrawLine(1, 1, 1, h-2);
 354
 355         dc.SetPen(*m_hilightPen);
 356         dc.DrawLine(0, h-1, w-1, h-1);
 357         dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
 358                                      /// Anyway, h is required for MSW.
 359
 360         dc.SetPen(*m_lightShadowPen);
 361         dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
 362         dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
 363     }
 364     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 365     {
 366         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 367         dc.SetPen(*wxBLACK_PEN);
 368         dc.DrawRectangle(0, 0, w-1, h-1);
 369     }
 370
 371     dc.SetPen(wxNullPen);
 372     dc.SetBrush(wxNullBrush);
 373 }
 374
 375 // Draw the sash
 376 void wxSplitterWindow::DrawSash(wxDC& dc)
 377 {
 378     if ( m_sashPosition == 0 || !m_windowTwo)
 379         return;
 380
 381     int w, h;
 382     GetClientSize(&w, &h);
 383
 384     if ( GetWindowStyleFlag() & wxSP_3D )
 385     {
 386         if ( m_splitMode == wxSPLIT_VERTICAL )
 387         {
 388             dc.SetPen(*m_facePen);
 389             dc.SetBrush(*m_faceBrush);
 390             dc.DrawRectangle(m_sashPosition + 2, 0, m_sashSize - 4, h);
 391
 392             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 393
 394             dc.SetPen(*m_lightShadowPen);
 395             dc.DrawLine(m_sashPosition, 1, m_sashPosition, h-2);
 396
 397             dc.SetPen(*m_hilightPen);
 398             dc.DrawLine(m_sashPosition+1, 0, m_sashPosition+1, h);
 399
 400             dc.SetPen(*m_mediumShadowPen);
 401             dc.DrawLine(m_sashPosition+m_sashSize-2, 1, m_sashPosition+m_sashSize-2, h-1);
 402
 403             dc.SetPen(*m_darkShadowPen);
 404             dc.DrawLine(m_sashPosition+m_sashSize-1, 2, m_sashPosition+m_sashSize-1, h-2);
 405         }
 406         else
 407         {
 408             dc.SetPen(*m_facePen);
 409             dc.SetBrush(*m_faceBrush);
 410             dc.DrawRectangle(0, m_sashPosition + 2, w, m_sashSize - 4);
 411
 412             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 413
 414             dc.SetPen(*m_lightShadowPen);
 415             dc.DrawLine(1, m_sashPosition, w-2, m_sashPosition);
 416
 417             dc.SetPen(*m_hilightPen);
 418             dc.DrawLine(0, m_sashPosition+1, w, m_sashPosition+1);
 419
 420             dc.SetPen(*m_mediumShadowPen);
 421             dc.DrawLine(1, m_sashPosition+m_sashSize-2, w-1, m_sashPosition+m_sashSize-2);
 422
 423             dc.SetPen(*m_darkShadowPen);
 424             dc.DrawLine(2, m_sashPosition+m_sashSize-1, w-2, m_sashPosition+m_sashSize-1);
 425         }
 426     }
 427     else
 428     {
 429         if ( m_splitMode == wxSPLIT_VERTICAL )
 430         {
 431             dc.SetPen(*wxBLACK_PEN);
 432             dc.SetBrush(*wxBLACK_BRUSH);
 433             int h1 = h-1;
 434             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 435                 h1 += 1; // Not sure why this is necessary...
 436             dc.DrawRectangle(m_sashPosition, 0, m_sashSize, h1);
 437         }
 438         else
 439         {
 440             dc.SetPen(*wxBLACK_PEN);
 441             dc.SetBrush(*wxBLACK_BRUSH);
 442             int w1 = w-1;
 443             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 444                 w1 ++;
 445
 446             dc.DrawRectangle(0, m_sashPosition, w1, m_sashSize);
 447         }
 448
 449     }
 450
 451     dc.SetPen(wxNullPen);
 452     dc.SetBrush(wxNullBrush);
 453 }
 454
 455 // Draw the sash tracker (for whilst moving the sash)
 456 void wxSplitterWindow::DrawSashTracker(int x, int y)
 457 {
 458     int w, h;
 459     GetClientSize(&w, &h);
 460
 461     wxScreenDC screenDC;
 462     int x1, y1;
 463     int x2, y2;
 464
 465     if ( m_splitMode == wxSPLIT_VERTICAL )
 466     {
 467         x1 = x; y1 = 2;
 468         x2 = x; y2 = h-2;
 469
 470         if ( x1 > w )
 471         {
 472             x1 = w; x2 = w;
 473         }
 474         else if ( x1 < 0 )
 475         {
 476             x1 = 0; x2 = 0;
 477         }
 478     }
 479     else
 480     {
 481         x1 = 2; y1 = y;
 482         x2 = w-2; y2 = y;
 483
 484         if ( y1 > h )
 485         {
 486             y1 = h;
 487             y2 = h;
 488         }
 489         else if ( y1 < 0 )
 490         {
 491             y1 = 0;
 492             y2 = 0;
 493         }
 494     }
 495
 496     ClientToScreen(&x1, &y1);
 497     ClientToScreen(&x2, &y2);
 498
 499     screenDC.SetLogicalFunction(wxXOR);
 500     screenDC.SetPen(*m_sashTrackerPen);
 501     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 502
 503     screenDC.DrawLine(x1, y1, x2, y2);
 504
 505     screenDC.SetLogicalFunction(wxCOPY);
 506
 507     screenDC.SetPen(wxNullPen);
 508     screenDC.SetBrush(wxNullBrush);
 509 }
 510
 511 // Position and size subwindows.
 512 // Note that the border size applies to each subwindow, not
 513 // including the edges next to the sash.
 514 void wxSplitterWindow::SizeWindows()
 515 {
 516     int w, h;
 517     GetClientSize(&w, &h);
 518
 519     if ( m_windowOne && !m_windowTwo )
 520     {
 521         m_windowOne->SetSize(m_borderSize, m_borderSize, w - 2*m_borderSize, h - 2*m_borderSize);
 522
 523         if (m_windowOne->GetAutoLayout())
 524             m_windowOne->Layout();
 525     }
 526     else if ( m_windowOne && m_windowTwo )
 527     {
 528         if (m_splitMode == wxSPLIT_VERTICAL)
 529         {
 530             int x1 = m_borderSize;
 531             int y1 = m_borderSize;
 532             int w1 = m_sashPosition - m_borderSize;
 533             int h1 = h - 2*m_borderSize;
 534
 535             int x2 = m_sashPosition + m_sashSize;
 536             int y2 = m_borderSize;
 537             int w2 = w - 2*m_borderSize - m_sashSize - w1;
 538             int h2 = h - 2*m_borderSize;
 539
 540             m_windowOne->SetSize(x1, y1, w1, h1);
 541             m_windowTwo->SetSize(x2, y2, w2, h2);
 542
 543             if (m_windowOne->GetAutoLayout())
 544                 m_windowOne->Layout();
 545             if (m_windowTwo->GetAutoLayout())
 546                 m_windowTwo->Layout();
 547         }
 548         else
 549         {
 550             m_windowOne->SetSize(m_borderSize, m_borderSize,
 551                 w - 2*m_borderSize, m_sashPosition - m_borderSize);
 552             m_windowTwo->SetSize(m_borderSize, m_sashPosition + m_sashSize,
 553                 w - 2*m_borderSize, h - 2*m_borderSize - m_sashSize - (m_sashPosition - m_borderSize));
 554
 555             if (m_windowOne->GetAutoLayout())
 556                 m_windowOne->Layout();
 557             if (m_windowTwo->GetAutoLayout())
 558                 m_windowTwo->Layout();
 559         }
 560     }
 561     wxClientDC dc(this);
 562     DrawBorders(dc);
 563     DrawSash(dc);
 564 }
 565
 566 // Set pane for unsplit window
 567 void wxSplitterWindow::Initialize(wxWindow *window)
 568 {
 569     m_windowOne = window;
 570     m_windowTwo = (wxWindow *) NULL;
 571     m_sashPosition = 0;
 572 }
 573
 574 // Associates the given window with window 2, drawing the appropriate sash
 575 // and changing the split mode.
 576 // Does nothing and returns FALSE if the window is already split.
 577 bool wxSplitterWindow::SplitVertically(wxWindow *window1, wxWindow *window2, int sashPosition)
 578 {
 579     if ( IsSplit() )
 580         return FALSE;
 581
 582     int w, h;
 583     GetClientSize(&w, &h);
 584
 585     m_splitMode = wxSPLIT_VERTICAL;
 586     m_windowOne = window1;
 587     m_windowTwo = window2;
 588     if ( sashPosition > 0 )
 589         m_sashPosition = sashPosition;
 590     else if ( sashPosition < 0 )
 591         m_sashPosition = w - sashPosition;
 592     else    // default
 593         m_sashPosition = w/2;
 594
 595     SizeWindows();
 596
 597     return TRUE;
 598 }
 599
 600 bool wxSplitterWindow::SplitHorizontally(wxWindow *window1, wxWindow *window2, int sashPosition)
 601 {
 602     if ( IsSplit() )
 603         return FALSE;
 604
 605     int w, h;
 606     GetClientSize(&w, &h);
 607
 608     m_splitMode = wxSPLIT_HORIZONTAL;
 609     m_windowOne = window1;
 610     m_windowTwo = window2;
 611     if ( sashPosition > 0 )
 612         m_sashPosition = sashPosition;
 613     else if ( sashPosition < 0 )
 614         m_sashPosition = h - sashPosition;
 615     else    // default
 616         m_sashPosition = h/2;
 617
 618     SizeWindows();
 619
 620     return TRUE;
 621 }
 622
 623
 624 // Remove the specified (or second) window from the view
 625 // Doesn't actually delete the window.
 626 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 627 {
 628     if ( ! IsSplit() )
 629         return FALSE;
 630
 631     wxWindow *win = NULL;
 632     if ( toRemove == NULL || toRemove == m_windowTwo)
 633     {
 634         win = m_windowTwo ;
 635         m_windowTwo = (wxWindow *) NULL;
 636     }
 637     else if ( toRemove == m_windowOne )
 638     {
 639         win = m_windowOne ;
 640         m_windowOne = m_windowTwo;
 641         m_windowTwo = (wxWindow *) NULL;
 642     }
 643     else
 644     {
 645         wxFAIL_MSG(_T("splitter: attempt to remove a non-existent window"));
 646
 647         return FALSE;
 648     }
 649
 650     SendUnsplitEvent(win);
 651     m_sashPosition = 0;
 652     SizeWindows();
 653
 654     return TRUE;
 655 }
 656
 657 // Replace a window with another one
 658 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 659 {
 660     wxCHECK_MSG( winOld, FALSE, _T("use one of Split() functions instead") );
 661     wxCHECK_MSG( winNew, FALSE, _T("use Unsplit() functions instead") );
 662
 663     if ( winOld == m_windowTwo )
 664     {
 665         m_windowTwo = winNew;
 666     }
 667     else if ( winOld == m_windowOne )
 668     {
 669         m_windowOne = winNew;
 670     }
 671     else
 672     {
 673         wxFAIL_MSG(_T("splitter: attempt to replace a non-existent window"));
 674
 675         return FALSE;
 676     }
 677
 678     SizeWindows();
 679
 680     return TRUE;
 681 }
 682
 683 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 684 {
 685     m_sashPosition = position;
 686
 687     if ( redraw )
 688     {
 689         SizeWindows();
 690     }
 691 }
 692
 693 // Initialize colours
 694 void wxSplitterWindow::InitColours()
 695 {
 696     wxDELETE( m_facePen );
 697     wxDELETE( m_faceBrush );
 698     wxDELETE( m_mediumShadowPen );
 699     wxDELETE( m_darkShadowPen );
 700     wxDELETE( m_lightShadowPen );
 701     wxDELETE( m_hilightPen );
 702
 703     // Shadow colours
 704 #if defined(__WIN95__)
 705     wxColour faceColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 706     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 707     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 708
 709     wxColour mediumShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW));
 710     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 711
 712     wxColour darkShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW));
 713     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 714
 715     wxColour lightShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT));
 716     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 717
 718     wxColour hilightColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT));
 719     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 720 #else // !Win32
 721     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 722     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 723     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 724     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 725     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 726     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 727 #endif // Win32/!Win32
 728 }
 729
 730 void wxSplitterWindow::SendUnsplitEvent(wxWindow *winRemoved)
 731 {
 732     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 733     event.m_data.win = winRemoved;
 734
 735     (void)GetEventHandler()->ProcessEvent(event);
 736 }
 737
 738 // ---------------------------------------------------------------------------
 739 // splitter event handlers
 740 // ---------------------------------------------------------------------------
 741
 742 void wxSplitterWindow::OnSashPosChanged(wxSplitterEvent& event)
 743 {
 744     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 745     const int UNSPLIT_THRESHOLD = 4;
 746
 747     int newSashPosition = event.GetSashPosition();
 748
 749     // Obtain relevant window dimension for bottom / right threshold check
 750     int w, h;
 751     GetClientSize(&w, &h);
 752     int window_size = (m_splitMode == wxSPLIT_VERTICAL) ? w : h ;
 753
 754     if ( newSashPosition <= UNSPLIT_THRESHOLD )
 755     {
 756         // threshold top / left check
 757         newSashPosition = 0;
 758     }
 759     else if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
 760     {
 761         // threshold bottom/right check
 762         newSashPosition = window_size;
 763     }
 764
 765     // If resultant pane would be too small, enlarge it.
 766
 767     // Check upper / left pane
 768     if ( newSashPosition < m_minimumPaneSize )
 769         newSashPosition = m_minimumPaneSize;
 770
 771     // Check lower / right pane (check even if sash was just adjusted)
 772     if ( newSashPosition > window_size - m_minimumPaneSize )
 773         newSashPosition = window_size - m_minimumPaneSize;
 774
 775     // If the result is out of bounds it means minimum size is too big,
 776     // so split window in half as best compromise.
 777     if ( newSashPosition < 0 || newSashPosition > window_size )
 778         newSashPosition = window_size / 2;
 779
 780     // for compatibility, call the virtual function
 781     if ( !OnSashPositionChange(newSashPosition) )
 782     {
 783         newSashPosition = -1;
 784     }
 785
 786     event.SetSashPosition(newSashPosition);
 787 }
 788
 789 // Called when the sash is double-clicked. The default behaviour is to remove
 790 // the sash if the minimum pane size is zero.
 791 void wxSplitterWindow::OnDoubleClick(wxSplitterEvent& event)
 792 {
 793     // for compatibility, call the virtual function
 794     OnDoubleClickSash(event.GetX(), event.GetY());
 795
 796     if ( GetMinimumPaneSize() == 0 )
 797     {
 798         Unsplit();
 799     }
 800 }
 801
 802 void wxSplitterWindow::OnUnsplitEvent(wxSplitterEvent& event)
 803 {
 804     wxWindow *win = event.GetWindowBeingRemoved();
 805
 806     // for compatibility, call the virtual function
 807     OnUnsplit(win);
 808
 809     win->Show(FALSE);
 810 }