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/window.h"
  25     #include "wx/dialog.h"
  26     #include "wx/frame.h"
  27 #endif
  28
  29 #include <stdlib.h>
  30
  31 #include "wx/string.h"
  32 #include "wx/splitter.h"
  33 #include "wx/dcscreen.h"
  34 #include "wx/settings.h"
  35 #include "wx/log.h"
  36
  37 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  38 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxCommandEvent)
  39
  40 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  41     EVT_PAINT(wxSplitterWindow::OnPaint)
  42     EVT_SIZE(wxSplitterWindow::OnSize)
  43     EVT_IDLE(wxSplitterWindow::OnIdle)
  44     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  45
  46     EVT_SET_CURSOR(wxSplitterWindow::OnSetCursor)
  47
  48     EVT_SPLITTER_SASH_POS_CHANGED(-1, wxSplitterWindow::OnSashPosChanged)
  49     // NB: we borrow OnSashPosChanged for purposes of
  50     // EVT_SPLITTER_SASH_POS_CHANGING since default implementation is identical
  51     EVT_SPLITTER_SASH_POS_CHANGING(-1, wxSplitterWindow::OnSashPosChanged)
  52     EVT_SPLITTER_DCLICK(-1,           wxSplitterWindow::OnDoubleClick)
  53     EVT_SPLITTER_UNSPLIT(-1,          wxSplitterWindow::OnUnsplitEvent)
  54 END_EVENT_TABLE()
  55
  56 bool wxSplitterWindow::Create(wxWindow *parent, wxWindowID id,
  57                                    const wxPoint& pos,
  58                                    const wxSize& size,
  59                                    long style,
  60                                    const wxString& name)
  61 {
  62     if (!wxWindow::Create(parent, id, pos, size, style, name))
  63         return FALSE;
  64
  65     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  66
  67     if ( style & wxSP_3DSASH )
  68         m_sashSize = 7;
  69     else
  70         m_sashSize = 3;
  71
  72     if ( style & wxSP_3DBORDER )
  73         m_borderSize = 2;
  74     else if ( style & wxSP_BORDER )
  75         m_borderSize = 1;
  76     else
  77         m_borderSize = 0;
  78
  79     return TRUE;
  80 }
  81
  82 void wxSplitterWindow::Init()
  83 {
  84     m_splitMode = wxSPLIT_VERTICAL;
  85     m_permitUnsplitAlways = TRUE;
  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     m_borderSize = 0;
 108     m_sashSize = 3;
 109
 110     InitColours();
 111
 112     m_needUpdating = FALSE;
 113 }
 114
 115 wxSplitterWindow::~wxSplitterWindow()
 116 {
 117     delete m_sashCursorWE;
 118     delete m_sashCursorNS;
 119     delete m_sashTrackerPen;
 120     delete m_lightShadowPen;
 121     delete m_darkShadowPen;
 122     delete m_mediumShadowPen;
 123     delete m_hilightPen;
 124     delete m_facePen;
 125     delete m_faceBrush;
 126 }
 127
 128 void wxSplitterWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 129 {
 130     wxPaintDC dc(this);
 131
 132     if ( m_borderSize > 0 )
 133         DrawBorders(dc);
 134     DrawSash(dc);
 135 }
 136
 137 void wxSplitterWindow::OnIdle(wxIdleEvent& event)
 138 {
 139     if (m_needUpdating)
 140         SizeWindows();
 141
 142     event.Skip();
 143 }
 144
 145 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 146 {
 147     wxCoord x = (wxCoord)event.GetX(),
 148             y = (wxCoord)event.GetY();
 149
 150     // reset the cursor
 151 #ifdef __WXMOTIF__
 152     SetCursor(* wxSTANDARD_CURSOR);
 153 #endif
 154 #ifdef __WXMSW__
 155     SetCursor(wxCursor());
 156 #endif
 157
 158     if (GetWindowStyle() & wxSP_NOSASH)
 159         return;
 160
 161     if (event.LeftDown())
 162     {
 163         if ( SashHitTest(x, y) )
 164         {
 165             CaptureMouse();
 166
 167             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 168
 169             if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 170             {
 171                 DrawSashTracker(x, y);
 172             }
 173
 174             m_oldX = x;
 175             m_oldY = y;
 176
 177             if ( m_splitMode == wxSPLIT_VERTICAL )
 178             {
 179                 SetCursor(*m_sashCursorWE);
 180             }
 181             else
 182             {
 183                 SetCursor(*m_sashCursorNS);
 184             }
 185             return;
 186         }
 187     }
 188     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 189     {
 190         // We can stop dragging now and see what we've got.
 191         m_dragMode = wxSPLIT_DRAG_NONE;
 192         ReleaseMouse();
 193
 194         // Erase old tracker
 195         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 196         {
 197             DrawSashTracker(m_oldX, m_oldY);
 198         }
 199
 200         // Obtain window size. We are only interested in the dimension the sash
 201         // splits up
 202         int w, h;
 203         GetClientSize(&w, &h);
 204         int window_size = (m_splitMode == wxSPLIT_VERTICAL ? w : h );
 205         int new_sash_position =
 206             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 207
 208         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED,
 209                                       this);
 210         eventSplitter.m_data.pos = new_sash_position;
 211         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 212         {
 213             new_sash_position = eventSplitter.GetSashPosition();
 214             if ( new_sash_position == -1 )
 215             {
 216                 // change not allowed
 217                 return;
 218             }
 219         }
 220
 221         if ( m_permitUnsplitAlways || 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 #if defined(__WXGTK__) || defined(__WXMSW__)
 268         else
 269         {
 270             // We must set the normal cursor in MSW, because
 271             // if the child window doesn't have a cursor, the
 272             // parent's (splitter window) will be used, and this
 273             // must be the standard cursor.
 274
 275             // where else do we unset the cursor?
 276             SetCursor(* wxSTANDARD_CURSOR);
 277         }
 278 #endif // __WXGTK__
 279     }
 280     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 281     {
 282 #ifdef __WXMSW__
 283         // Otherwise, the cursor sometimes reverts to the normal cursor
 284         // during dragging.
 285         if ( m_splitMode == wxSPLIT_VERTICAL )
 286         {
 287             SetCursor(*m_sashCursorWE);
 288         }
 289         else
 290         {
 291             SetCursor(*m_sashCursorNS);
 292         }
 293 #endif
 294
 295         // Obtain window size. We are only interested in the dimension the sash
 296         // splits up
 297         int new_sash_position =
 298             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 299
 300         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING,
 301                                       this);
 302         eventSplitter.m_data.pos = new_sash_position;
 303         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 304         {
 305             new_sash_position = eventSplitter.GetSashPosition();
 306             if ( new_sash_position == -1 )
 307             {
 308                 // change not allowed
 309                 return;
 310             }
 311         }
 312
 313         if (new_sash_position == m_sashPosition)
 314             return;
 315
 316         // Erase old tracker
 317         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 318         {
 319             DrawSashTracker(m_oldX, m_oldY);
 320         }
 321
 322         if (m_splitMode == wxSPLIT_VERTICAL)
 323             x = new_sash_position;
 324         else
 325             y = new_sash_position;
 326
 327         // Remember old positions
 328         m_oldX = x;
 329         m_oldY = y;
 330
 331 #ifdef __WXMSW__
 332         // As we captured the mouse, we may get the mouse events from outside
 333         // our window - for example, negative values in x, y. This has a weird
 334         // consequence under MSW where we use unsigned values sometimes and
 335         // signed ones other times: the coordinates turn as big positive
 336         // numbers and so the sash is drawn on the *right* side of the window
 337         // instead of the left (or bottom instead of top). Correct this.
 338         if ( (short)m_oldX < 0 )
 339             m_oldX = 0;
 340         if ( (short)m_oldY < 0 )
 341             m_oldY = 0;
 342 #endif // __WXMSW__
 343
 344         // Draw new one
 345         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 346         {
 347             DrawSashTracker(m_oldX, m_oldY);
 348         }
 349         else
 350         {
 351             m_sashPosition = new_sash_position;
 352             m_needUpdating = TRUE;
 353         }
 354     }
 355     else if ( event.LeftDClick() )
 356     {
 357         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,
 358                                       this);
 359         eventSplitter.m_data.pt.x = x;
 360         eventSplitter.m_data.pt.y = y;
 361
 362         (void)GetEventHandler()->ProcessEvent(eventSplitter);
 363     }
 364 }
 365
 366 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 367 {
 368     // only process this message if we're not iconized - otherwise iconizing
 369     // and restoring a window containing the splitter has a funny side effect
 370     // of changing the splitter position!
 371     wxWindow *parent = GetParent();
 372     while ( parent && !parent->IsTopLevel() )
 373     {
 374         parent = parent->GetParent();
 375     }
 376
 377     bool iconized = FALSE;
 378     wxFrame *frame = wxDynamicCast(parent, wxFrame);
 379     if ( frame )
 380         iconized = frame->IsIconized();
 381     else
 382     {
 383         wxDialog *dialog = wxDynamicCast(parent, wxDialog);
 384         if ( dialog )
 385             iconized = dialog->IsIconized();
 386         else
 387             wxFAIL_MSG(wxT("should have a top level frame or dialog parent!"));
 388     }
 389
 390     if ( iconized )
 391     {
 392         event.Skip();
 393     }
 394     else
 395     {
 396         int cw, ch;
 397         GetClientSize( &cw, &ch );
 398         if ( m_windowTwo )
 399         {
 400             if ( m_splitMode == wxSPLIT_VERTICAL )
 401             {
 402                 if ( m_sashPosition >= (cw - 5) )
 403                     m_sashPosition = wxMax(10, cw - 40);
 404             }
 405             if ( m_splitMode == wxSPLIT_HORIZONTAL )
 406             {
 407                 if ( m_sashPosition >= (ch - 5) )
 408                     m_sashPosition = wxMax(10, ch - 40);
 409             }
 410         }
 411
 412         SizeWindows();
 413     }
 414 }
 415
 416 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 417 {
 418     if ( m_windowTwo == NULL || m_sashPosition == 0)
 419         return FALSE; // No sash
 420
 421     if ( m_splitMode == wxSPLIT_VERTICAL )
 422     {
 423         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 424             return TRUE;
 425         else
 426             return FALSE;
 427     }
 428     else
 429     {
 430         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 431             return TRUE;
 432         else
 433             return FALSE;
 434     }
 435 }
 436
 437 // Draw 3D effect borders
 438 void wxSplitterWindow::DrawBorders(wxDC& dc)
 439 {
 440     int w, h;
 441     GetClientSize(&w, &h);
 442
 443     if ( GetWindowStyleFlag() & wxSP_3DBORDER )
 444     {
 445
 446         dc.SetPen(*m_facePen);
 447         dc.SetBrush(*m_faceBrush);
 448         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 449         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 450         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 451         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 452
 453         dc.SetPen(*m_mediumShadowPen);
 454         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 455         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 456
 457         dc.SetPen(*m_darkShadowPen);
 458         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 459         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 460
 461         dc.SetPen(*m_hilightPen);
 462         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 463         dc.DrawLine(w-m_borderSize+1, m_borderSize - 2, w-m_borderSize+1, h-m_borderSize+2); // Surely the maximum y pos. should be h - 1.
 464                                      /// Anyway, h is required for MSW.
 465
 466         dc.SetPen(*m_lightShadowPen);
 467         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 468         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 469     }
 470     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 471     {
 472         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 473         dc.SetPen(*wxBLACK_PEN);
 474         dc.DrawRectangle(0, 0, w-1, h-1);
 475     }
 476
 477     dc.SetPen(wxNullPen);
 478     dc.SetBrush(wxNullBrush);
 479 }
 480
 481 // Draw the sash
 482 void wxSplitterWindow::DrawSash(wxDC& dc)
 483 {
 484     if ( m_sashPosition == 0 || !m_windowTwo)
 485         return;
 486     if (GetWindowStyle() & wxSP_NOSASH)
 487         return;
 488
 489     int w, h;
 490     GetClientSize(&w, &h);
 491
 492     if ( GetWindowStyleFlag() & wxSP_3DSASH )
 493     {
 494         if ( m_splitMode == wxSPLIT_VERTICAL )
 495         {
 496             dc.SetPen(*m_facePen);
 497             dc.SetBrush(*m_faceBrush);
 498             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 499
 500             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 501
 502             dc.SetPen(*m_lightShadowPen);
 503             int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 504             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 505
 506             dc.SetPen(*m_hilightPen);
 507             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 508
 509             dc.SetPen(*m_mediumShadowPen);
 510                         int yMedium = m_borderSize ? h-m_borderSize+1 : h ;
 511             dc.DrawLine(m_sashPosition+m_sashSize-2, xShadow, m_sashPosition+m_sashSize-2, yMedium);
 512
 513             dc.SetPen(*m_darkShadowPen);
 514             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 515
 516             // Draw the top and bottom edges of the sash, if requested
 517             if (GetWindowStyle() & wxSP_FULLSASH)
 518             {
 519                 // Top
 520                 dc.SetPen(*m_hilightPen);
 521                 dc.DrawLine(m_sashPosition+1, m_borderSize, m_sashPosition+m_sashSize-1, m_borderSize);
 522
 523                 // Bottom
 524                 dc.SetPen(*m_darkShadowPen);
 525                 dc.DrawLine(m_sashPosition+1, h-m_borderSize-1, m_sashPosition+m_sashSize-1, h-m_borderSize-1);
 526             }
 527         }
 528         else
 529         {
 530             dc.SetPen(*m_facePen);
 531             dc.SetBrush(*m_faceBrush);
 532             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 533
 534             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 535
 536             dc.SetPen(*m_lightShadowPen);
 537             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 538
 539             dc.SetPen(*m_hilightPen);
 540             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 541
 542             dc.SetPen(*m_mediumShadowPen);
 543             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 544
 545             dc.SetPen(*m_darkShadowPen);
 546             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 547
 548             // Draw the left and right edges of the sash, if requested
 549             if (GetWindowStyle() & wxSP_FULLSASH)
 550             {
 551                 // Left
 552                 dc.SetPen(*m_hilightPen);
 553                 dc.DrawLine(m_borderSize, m_sashPosition, m_borderSize, m_sashPosition+m_sashSize);
 554
 555                 // Right
 556                 dc.SetPen(*m_darkShadowPen);
 557                 dc.DrawLine(w-m_borderSize-1, m_sashPosition+1, w-m_borderSize-1, m_sashPosition+m_sashSize-1);
 558             }
 559         }
 560     }
 561     else
 562     {
 563         if ( m_splitMode == wxSPLIT_VERTICAL )
 564         {
 565             dc.SetPen(*wxBLACK_PEN);
 566             dc.SetBrush(*wxBLACK_BRUSH);
 567             int h1 = h-1;
 568             int y1 = 0;
 569             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 570                 h1 += 1; // Not sure why this is necessary...
 571             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 572             {
 573                 y1 = 2; h1 -= 3;
 574             }
 575             dc.DrawRectangle(m_sashPosition, y1, m_sashSize, h1);
 576         }
 577         else
 578         {
 579             dc.SetPen(*wxBLACK_PEN);
 580             dc.SetBrush(*wxBLACK_BRUSH);
 581             int w1 = w-1;
 582             int x1 = 0;
 583             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 584                 w1 ++;
 585             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 586             {
 587                 x1 = 2; w1 -= 3;
 588             }
 589             dc.DrawRectangle(x1, m_sashPosition, w1, m_sashSize);
 590         }
 591
 592     }
 593
 594     dc.SetPen(wxNullPen);
 595     dc.SetBrush(wxNullBrush);
 596 }
 597
 598 // Draw the sash tracker (for whilst moving the sash)
 599 void wxSplitterWindow::DrawSashTracker(int x, int y)
 600 {
 601     int w, h;
 602     GetClientSize(&w, &h);
 603
 604     wxScreenDC screenDC;
 605     int x1, y1;
 606     int x2, y2;
 607
 608     if ( m_splitMode == wxSPLIT_VERTICAL )
 609     {
 610         x1 = x; y1 = 2;
 611         x2 = x; y2 = h-2;
 612
 613         if ( x1 > w )
 614         {
 615             x1 = w; x2 = w;
 616         }
 617         else if ( x1 < 0 )
 618         {
 619             x1 = 0; x2 = 0;
 620         }
 621     }
 622     else
 623     {
 624         x1 = 2; y1 = y;
 625         x2 = w-2; y2 = y;
 626
 627         if ( y1 > h )
 628         {
 629             y1 = h;
 630             y2 = h;
 631         }
 632         else if ( y1 < 0 )
 633         {
 634             y1 = 0;
 635             y2 = 0;
 636         }
 637     }
 638
 639     ClientToScreen(&x1, &y1);
 640     ClientToScreen(&x2, &y2);
 641
 642     screenDC.SetLogicalFunction(wxINVERT);
 643     screenDC.SetPen(*m_sashTrackerPen);
 644     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 645
 646     screenDC.DrawLine(x1, y1, x2, y2);
 647
 648     screenDC.SetLogicalFunction(wxCOPY);
 649
 650     screenDC.SetPen(wxNullPen);
 651     screenDC.SetBrush(wxNullBrush);
 652 }
 653
 654 // Position and size subwindows.
 655 // Note that the border size applies to each subwindow, not
 656 // including the edges next to the sash.
 657 void wxSplitterWindow::SizeWindows()
 658 {
 659     int w, h;
 660     GetClientSize(&w, &h);
 661
 662     if ( GetWindow1() && !GetWindow2() )
 663     {
 664         GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(), w - 2*GetBorderSize(), h - 2*GetBorderSize());
 665
 666     }
 667     else if ( GetWindow1() && GetWindow2() )
 668     {
 669         if (GetSplitMode() == wxSPLIT_VERTICAL)
 670         {
 671             int x1 = GetBorderSize();
 672             int y1 = GetBorderSize();
 673             int w1 = GetSashPosition() - GetBorderSize();
 674             int h1 = h - 2*GetBorderSize();
 675
 676             int x2 = GetSashPosition() + GetSashSize();
 677             int y2 = GetBorderSize();
 678             int w2 = w - 2*GetBorderSize() - GetSashSize() - w1;
 679             int h2 = h - 2*GetBorderSize();
 680
 681             GetWindow1()->SetSize(x1, y1, w1, h1);
 682             GetWindow2()->SetSize(x2, y2, w2, h2);
 683         }
 684         else
 685         {
 686             GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 687                 w - 2*GetBorderSize(), GetSashPosition() - GetBorderSize());
 688             GetWindow2()->SetSize(GetBorderSize(), GetSashPosition() + GetSashSize(),
 689                 w - 2*GetBorderSize(), h - 2*GetBorderSize() - GetSashSize() - (GetSashPosition() - GetBorderSize()));
 690         }
 691     }
 692     wxClientDC dc(this);
 693     if ( GetBorderSize() > 0 )
 694         DrawBorders(dc);
 695     DrawSash(dc);
 696
 697     SetNeedUpdating(FALSE);
 698 }
 699
 700 // Set pane for unsplit window
 701 void wxSplitterWindow::Initialize(wxWindow *window)
 702 {
 703     m_windowOne = window;
 704     m_windowTwo = (wxWindow *) NULL;
 705     m_sashPosition = 0;
 706 }
 707
 708 // Associates the given window with window 2, drawing the appropriate sash
 709 // and changing the split mode.
 710 // Does nothing and returns FALSE if the window is already split.
 711 bool wxSplitterWindow::SplitVertically(wxWindow *window1, wxWindow *window2, int sashPosition)
 712 {
 713     if ( IsSplit() )
 714         return FALSE;
 715
 716     int w, h;
 717     GetClientSize(&w, &h);
 718
 719     m_splitMode = wxSPLIT_VERTICAL;
 720     m_windowOne = window1;
 721     m_windowTwo = window2;
 722     if ( sashPosition > 0 )
 723         m_sashPosition = sashPosition;
 724     else if ( sashPosition < 0 )
 725         m_sashPosition = w - sashPosition;
 726     else    // default
 727         m_sashPosition = w/2;
 728
 729     SizeWindows();
 730
 731     return TRUE;
 732 }
 733
 734 bool wxSplitterWindow::SplitHorizontally(wxWindow *window1, wxWindow *window2, int sashPosition)
 735 {
 736     if ( IsSplit() )
 737         return FALSE;
 738
 739     int w, h;
 740     GetClientSize(&w, &h);
 741
 742     m_splitMode = wxSPLIT_HORIZONTAL;
 743     m_windowOne = window1;
 744     m_windowTwo = window2;
 745     if ( sashPosition > 0 )
 746         m_sashPosition = sashPosition;
 747     else if ( sashPosition < 0 )
 748         m_sashPosition = h - sashPosition;
 749     else    // default
 750         m_sashPosition = h/2;
 751
 752     SizeWindows();
 753
 754     return TRUE;
 755 }
 756
 757
 758 // Remove the specified (or second) window from the view
 759 // Doesn't actually delete the window.
 760 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 761 {
 762     if ( ! IsSplit() )
 763         return FALSE;
 764
 765     wxWindow *win = NULL;
 766     if ( toRemove == NULL || toRemove == m_windowTwo)
 767     {
 768         win = m_windowTwo ;
 769         m_windowTwo = (wxWindow *) NULL;
 770     }
 771     else if ( toRemove == m_windowOne )
 772     {
 773         win = m_windowOne ;
 774         m_windowOne = m_windowTwo;
 775         m_windowTwo = (wxWindow *) NULL;
 776     }
 777     else
 778     {
 779         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 780
 781         return FALSE;
 782     }
 783
 784     SendUnsplitEvent(win);
 785     m_sashPosition = 0;
 786     SizeWindows();
 787
 788     return TRUE;
 789 }
 790
 791 // Replace a window with another one
 792 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 793 {
 794     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 795     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 796
 797     if ( winOld == m_windowTwo )
 798     {
 799         m_windowTwo = winNew;
 800     }
 801     else if ( winOld == m_windowOne )
 802     {
 803         m_windowOne = winNew;
 804     }
 805     else
 806     {
 807         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 808
 809         return FALSE;
 810     }
 811
 812     SizeWindows();
 813
 814     return TRUE;
 815 }
 816
 817 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 818 {
 819     m_sashPosition = position;
 820
 821     if ( redraw )
 822     {
 823         SizeWindows();
 824     }
 825 }
 826
 827 // Initialize colours
 828 void wxSplitterWindow::InitColours()
 829 {
 830     wxDELETE( m_facePen );
 831     wxDELETE( m_faceBrush );
 832     wxDELETE( m_mediumShadowPen );
 833     wxDELETE( m_darkShadowPen );
 834     wxDELETE( m_lightShadowPen );
 835     wxDELETE( m_hilightPen );
 836
 837     // Shadow colours
 838 #ifndef __WIN16__
 839     wxColour faceColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 840     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 841     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 842
 843     wxColour mediumShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW));
 844     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 845
 846     wxColour darkShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW));
 847     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 848
 849     wxColour lightShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT));
 850     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 851
 852     wxColour hilightColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT));
 853     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 854 #else
 855     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 856     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 857     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 858     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 859     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 860     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 861 #endif // __WIN16__
 862 }
 863
 864 void wxSplitterWindow::SendUnsplitEvent(wxWindow *winRemoved)
 865 {
 866     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 867     event.m_data.win = winRemoved;
 868
 869     (void)GetEventHandler()->ProcessEvent(event);
 870 }
 871
 872 // ---------------------------------------------------------------------------
 873 // splitter event handlers
 874 // ---------------------------------------------------------------------------
 875
 876 void wxSplitterWindow::OnSashPosChanged(wxSplitterEvent& event)
 877 {
 878     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 879     const int UNSPLIT_THRESHOLD = 4;
 880
 881     int newSashPosition = event.GetSashPosition();
 882
 883     // Obtain relevant window dimension for bottom / right threshold check
 884     int w, h;
 885     GetClientSize(&w, &h);
 886     int window_size = (m_splitMode == wxSPLIT_VERTICAL) ? w : h ;
 887
 888     bool unsplit_scenario = FALSE;
 889     if ( m_permitUnsplitAlways
 890             || m_minimumPaneSize == 0 )
 891     {
 892         // Do edge detection if unsplit premitted
 893         if ( newSashPosition <= UNSPLIT_THRESHOLD )
 894         {
 895             // threshold top / left check
 896             newSashPosition = 0;
 897             unsplit_scenario = TRUE;
 898         }
 899         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
 900         {
 901             // threshold bottom/right check
 902             newSashPosition = window_size;
 903             unsplit_scenario = TRUE;
 904         }
 905     }
 906
 907     if ( !unsplit_scenario )
 908     {
 909         // If resultant pane would be too small, enlarge it
 910         if ( newSashPosition < m_minimumPaneSize )
 911             newSashPosition = m_minimumPaneSize;
 912         if ( newSashPosition > window_size - m_minimumPaneSize )
 913             newSashPosition = window_size - m_minimumPaneSize;
 914     }
 915
 916     // If the result is out of bounds it means minimum size is too big,
 917     // so split window in half as best compromise.
 918     if ( newSashPosition < 0 || newSashPosition > window_size )
 919         newSashPosition = window_size / 2;
 920
 921     // for compatibility, call the virtual function
 922     if ( !OnSashPositionChange(newSashPosition) )
 923     {
 924         newSashPosition = -1;
 925     }
 926
 927     event.SetSashPosition(newSashPosition);
 928 }
 929
 930 // Called when the sash is double-clicked. The default behaviour is to remove
 931 // the sash if the minimum pane size is zero.
 932 void wxSplitterWindow::OnDoubleClick(wxSplitterEvent& event)
 933 {
 934     // for compatibility, call the virtual function
 935     OnDoubleClickSash(event.GetX(), event.GetY());
 936
 937     if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
 938     {
 939         Unsplit();
 940     }
 941 }
 942
 943 void wxSplitterWindow::OnUnsplitEvent(wxSplitterEvent& event)
 944 {
 945     wxWindow *win = event.GetWindowBeingRemoved();
 946
 947     // do it before calling OnUnsplit() which may delete the window
 948     win->Show(FALSE);
 949
 950     // for compatibility, call the virtual function
 951     OnUnsplit(win);
 952 }
 953
 954 #if defined(__WXMSW__)
 955     #define WXUNUSED_UNLESS_MSW(identifier)    identifier
 956 #else
 957     #define WXUNUSED_UNLESS_MSW(identifier)    WXUNUSED(identifier)
 958 #endif
 959
 960 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& WXUNUSED_UNLESS_MSW(event))
 961 {
 962     // this is currently called (and needed) under MSW only...
 963 #ifdef __WXMSW__
 964
 965     // if we don't do it, the resizing cursor might be set for child window:
 966     // and like this we explicitly say that our cursor should not be used for
 967     // children windows which overlap us
 968
 969     if ( SashHitTest(event.GetX(), event.GetY()) )
 970     {
 971         // default processing is ok
 972         event.Skip();
 973     }
 974     //else: do nothing, in particular, don't call Skip()
 975 #endif // wxMSW
 976 }