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