src/generic/splitter.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/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
   9 // Licence:     wxWindows licence
  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/string.h"
  25     #include "wx/utils.h"
  26     #include "wx/log.h"
  27
  28     #include "wx/dcscreen.h"
  29
  30     #include "wx/window.h"
  31     #include "wx/dialog.h"
  32     #include "wx/frame.h"
  33
  34     #include "wx/settings.h"
  35 #endif
  36
  37 #include "wx/splitter.h"
  38
  39 #include <stdlib.h>
  40
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED)
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_UNSPLIT)
  45
  46 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  47 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxNotifyEvent)
  48
  49 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  50     EVT_PAINT(wxSplitterWindow::OnPaint)
  51     EVT_SIZE(wxSplitterWindow::OnSize)
  52     EVT_IDLE(wxSplitterWindow::OnIdle)
  53     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  54
  55 #if defined( __WXMSW__ ) || defined( __WXMAC__)
  56     EVT_SET_CURSOR(wxSplitterWindow::OnSetCursor)
  57 #endif // wxMSW
  58
  59     WX_EVENT_TABLE_CONTROL_CONTAINER(wxSplitterWindow)
  60 END_EVENT_TABLE()
  61
  62 WX_DELEGATE_TO_CONTROL_CONTAINER(wxSplitterWindow);
  63
  64 bool wxSplitterWindow::Create(wxWindow *parent, wxWindowID id,
  65                                    const wxPoint& pos,
  66                                    const wxSize& size,
  67                                    long style,
  68                                    const wxString& name)
  69 {
  70     // allow TABbing from one window to the other
  71     style |= wxTAB_TRAVERSAL;
  72
  73     if (!wxWindow::Create(parent, id, pos, size, style, name))
  74         return FALSE;
  75
  76     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  77
  78     if ( style & wxSP_3DSASH )
  79         m_sashSize = 7;
  80     else
  81         m_sashSize = 3;
  82
  83     if ( style & wxSP_3DBORDER )
  84         m_borderSize = 2;
  85     else if ( style & wxSP_BORDER )
  86         m_borderSize = 1;
  87     else
  88         m_borderSize = 0;
  89
  90 #ifdef __WXMAC__
  91     int major,minor;
  92     wxGetOsVersion( &major, &minor );
  93     if (major >= 10)
  94         m_windowStyle |= wxSP_SASH_AQUA;
  95 #endif
  96
  97     return TRUE;
  98 }
  99
 100 void wxSplitterWindow::Init()
 101 {
 102     m_container.SetContainerWindow(this);
 103
 104     m_splitMode = wxSPLIT_VERTICAL;
 105     m_permitUnsplitAlways = TRUE;
 106     m_windowOne = (wxWindow *) NULL;
 107     m_windowTwo = (wxWindow *) NULL;
 108     m_dragMode = wxSPLIT_DRAG_NONE;
 109     m_oldX = 0;
 110     m_oldY = 0;
 111     m_firstX = 0;
 112     m_firstY = 0;
 113     m_sashSize = 3;
 114     m_borderSize = 0;
 115     m_sashPosition = m_requestedSashPosition = 0;
 116     m_minimumPaneSize = 0;
 117     m_sashCursorWE = wxCursor(wxCURSOR_SIZEWE);
 118     m_sashCursorNS = wxCursor(wxCURSOR_SIZENS);
 119     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
 120     m_lightShadowPen = (wxPen *) NULL;
 121     m_mediumShadowPen = (wxPen *) NULL;
 122     m_darkShadowPen = (wxPen *) NULL;
 123     m_faceBrush = (wxBrush *) NULL;
 124     m_facePen = (wxPen *) NULL;
 125     m_hilightPen = (wxPen *) NULL;
 126
 127     InitColours();
 128
 129     m_needUpdating = FALSE;
 130 }
 131
 132 wxSplitterWindow::~wxSplitterWindow()
 133 {
 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::SetResizeCursor()
 144 {
 145     SetCursor(m_splitMode == wxSPLIT_VERTICAL ? m_sashCursorWE
 146                                               : m_sashCursorNS);
 147 }
 148
 149 void wxSplitterWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 150 {
 151     wxPaintDC dc(this);
 152
 153     if ( m_borderSize > 0 )
 154         DrawBorders(dc);
 155     DrawSash(dc);
 156 }
 157
 158 void wxSplitterWindow::OnIdle(wxIdleEvent& event)
 159 {
 160     if (m_needUpdating)
 161         SizeWindows();
 162
 163     event.Skip();
 164 }
 165
 166 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 167 {
 168     int x = (int)event.GetX(),
 169         y = (int)event.GetY();
 170
 171 #if defined(__WXMSW__)
 172     // SetCursor(wxCursor());   // Is this required?
 173 #endif
 174
 175     if (GetWindowStyle() & wxSP_NOSASH)
 176         return;
 177
 178     // with wxSP_LIVE_UPDATE style the splitter windows are always resized
 179     // following the mouse movement while it drags the sash, without it we only
 180     // draw the sash at the new position but only resize the windows when the
 181     // dragging is finished
 182     bool isLive = (GetWindowStyleFlag() & wxSP_LIVE_UPDATE) != 0;
 183
 184     if (event.LeftDown())
 185     {
 186         if ( SashHitTest(x, y) )
 187         {
 188             // Start the drag now
 189             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 190
 191             // Capture mouse and set the cursor
 192             CaptureMouse();
 193             SetResizeCursor();
 194
 195             if ( !isLive )
 196             {
 197                 // remember the initial sash position and draw the initial
 198                 // shadow sash
 199                 m_sashPositionCurrent = m_sashPosition;
 200
 201                 DrawSashTracker(x, y);
 202             }
 203
 204             m_oldX = x;
 205             m_oldY = y;
 206
 207             SetResizeCursor();
 208             return;
 209         }
 210     }
 211     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 212     {
 213         // We can stop dragging now and see what we've got.
 214         m_dragMode = wxSPLIT_DRAG_NONE;
 215
 216         // Release mouse and unset the cursor
 217         ReleaseMouse();
 218         SetCursor(* wxSTANDARD_CURSOR);
 219
 220         // exit if unsplit after doubleclick
 221         if ( !IsSplit() )
 222         {
 223             return;
 224         }
 225
 226         // Erase old tracker
 227         if ( !isLive )
 228         {
 229             DrawSashTracker(m_oldX, m_oldY);
 230         }
 231
 232         // the position of the click doesn't exactly correspond to
 233         // m_sashPosition, rather it changes it by the distance by which the
 234         // mouse has moved
 235         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 236
 237         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 238         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 239         if ( posSashNew == -1 )
 240         {
 241             // change not allowed
 242             return;
 243         }
 244
 245         if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 246         {
 247             // Deal with possible unsplit scenarios
 248             if ( posSashNew == 0 )
 249             {
 250                 // We remove the first window from the view
 251                 wxWindow *removedWindow = m_windowOne;
 252                 m_windowOne = m_windowTwo;
 253                 m_windowTwo = (wxWindow *) NULL;
 254                 OnUnsplit(removedWindow);
 255                 SetSashPositionAndNotify(0);
 256             }
 257             else if ( posSashNew == GetWindowSize() )
 258             {
 259                 // We remove the second window from the view
 260                 wxWindow *removedWindow = m_windowTwo;
 261                 m_windowTwo = (wxWindow *) NULL;
 262                 OnUnsplit(removedWindow);
 263                 SetSashPositionAndNotify(0);
 264             }
 265             else
 266             {
 267                 SetSashPositionAndNotify(posSashNew);
 268             }
 269         }
 270         else
 271         {
 272             SetSashPositionAndNotify(posSashNew);
 273         }
 274
 275         SizeWindows();
 276     }  // left up && dragging
 277     else if (event.Moving() && !event.Dragging())
 278     {
 279         // Just change the cursor as required
 280         if ( SashHitTest(x, y) )
 281             SetResizeCursor();
 282         else
 283             SetCursor(* wxSTANDARD_CURSOR);
 284     }
 285     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 286     {
 287         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 288         if ( !diff )
 289         {
 290             // nothing to do, mouse didn't really move far enough
 291             return;
 292         }
 293
 294         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 295         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 296         if ( posSashNew == -1 )
 297         {
 298             // change not allowed
 299             return;
 300         }
 301
 302         if ( posSashNew == m_sashPosition )
 303             return;
 304
 305         // Erase old tracker
 306         if ( !isLive )
 307         {
 308             DrawSashTracker(m_oldX, m_oldY);
 309         }
 310
 311         if (m_splitMode == wxSPLIT_VERTICAL)
 312             x = posSashNew;
 313         else
 314             y = posSashNew;
 315
 316         // Remember old positions
 317         m_oldX = x;
 318         m_oldY = y;
 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 ( !isLive )
 335         {
 336             m_sashPositionCurrent = posSashNew;
 337
 338             DrawSashTracker(m_oldX, m_oldY);
 339         }
 340         else
 341         {
 342             SetSashPositionAndNotify(posSashNew);
 343             m_needUpdating = TRUE;
 344         }
 345     }
 346     else if ( event.LeftDClick() && m_windowTwo )
 347     {
 348         OnDoubleClickSash(x, y);
 349     }
 350 }
 351
 352 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 353 {
 354     // only process this message if we're not iconized - otherwise iconizing
 355     // and restoring a window containing the splitter has a funny side effect
 356     // of changing the splitter position!
 357     wxWindow *parent = GetParent();
 358     while ( parent && !parent->IsTopLevel() )
 359     {
 360         parent = parent->GetParent();
 361     }
 362
 363     bool iconized = FALSE;
 364
 365     // wxMotif doesn't yet have a wxTopLevelWindow implementation
 366 #ifdef __WXMOTIF__
 367     wxFrame *winTop = wxDynamicCast(parent, wxFrame);
 368 #else
 369     wxTopLevelWindow *winTop = wxDynamicCast(parent, wxTopLevelWindow);
 370 #endif
 371     if ( winTop )
 372     {
 373         iconized = winTop->IsIconized();
 374     }
 375 #ifndef __WXMOTIF__
 376     else
 377     {
 378         wxFAIL_MSG(wxT("should have a top level parent!"));
 379
 380         iconized = FALSE;
 381     }
 382 #endif
 383
 384     if ( iconized )
 385     {
 386         event.Skip();
 387
 388         return;
 389     }
 390
 391     int cw, ch;
 392     GetClientSize( &cw, &ch );
 393     if ( m_windowTwo )
 394     {
 395         if ( m_splitMode == wxSPLIT_VERTICAL )
 396         {
 397             if ( m_sashPosition >= (cw - 5) )
 398                 SetSashPositionAndNotify(wxMax(10, cw - 40));
 399         }
 400         else // m_splitMode == wxSPLIT_HORIZONTAL
 401         {
 402             if ( m_sashPosition >= (ch - 5) )
 403                 SetSashPositionAndNotify(wxMax(10, ch - 40));
 404         }
 405     }
 406
 407     SizeWindows();
 408 }
 409
 410 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 411 {
 412     if ( m_windowTwo == NULL || m_sashPosition == 0)
 413         return FALSE; // No sash
 414
 415     if ( m_splitMode == wxSPLIT_VERTICAL )
 416     {
 417         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 418             return TRUE;
 419         else
 420             return FALSE;
 421     }
 422     else
 423     {
 424         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 425             return TRUE;
 426         else
 427             return FALSE;
 428     }
 429 }
 430
 431 // Draw 3D effect borders
 432 void wxSplitterWindow::DrawBorders(wxDC& dc)
 433 {
 434     int w, h;
 435     GetClientSize(&w, &h);
 436
 437     if ( GetWindowStyleFlag() & wxSP_3DBORDER )
 438     {
 439
 440         dc.SetPen(*m_facePen);
 441         dc.SetBrush(*m_faceBrush);
 442         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 443         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 444         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 445         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 446
 447         dc.SetPen(*m_mediumShadowPen);
 448         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 449         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 450
 451         dc.SetPen(*m_darkShadowPen);
 452         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 453         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 454
 455         dc.SetPen(*m_hilightPen);
 456         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 457         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.
 458                                      /// Anyway, h is required for MSW.
 459
 460         dc.SetPen(*m_lightShadowPen);
 461         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 462         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 463     }
 464     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 465     {
 466         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 467         dc.SetPen(*wxBLACK_PEN);
 468         dc.DrawRectangle(0, 0, w-1, h-1);
 469     }
 470
 471     dc.SetPen(wxNullPen);
 472     dc.SetBrush(wxNullBrush);
 473 }
 474
 475 // Draw the sash
 476 void wxSplitterWindow::DrawSash(wxDC& dc)
 477 {
 478     if ( m_sashPosition == 0 || !m_windowTwo)
 479         return;
 480     if (GetWindowStyle() & wxSP_NOSASH)
 481         return;
 482
 483     int w, h;
 484     GetClientSize(&w, &h);
 485
 486     if ( GetWindowStyleFlag() & wxSP_3DSASH )
 487     {
 488         if ( m_splitMode == wxSPLIT_VERTICAL )
 489         {
 490             dc.SetPen(*m_facePen);
 491
 492             if (HasFlag( wxSP_SASH_AQUA ))
 493                 dc.SetBrush(*wxWHITE_BRUSH);
 494             else
 495                 dc.SetBrush(*m_faceBrush);
 496             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 497
 498             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 499
 500             dc.SetPen(*m_lightShadowPen);
 501             int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 502             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 503
 504             dc.SetPen(*m_hilightPen);
 505             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 506
 507             if (!HasFlag( wxSP_SASH_AQUA ))
 508                 dc.SetPen(*m_mediumShadowPen);
 509
 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             if (HasFlag( wxSP_SASH_AQUA ))
 514                 dc.SetPen(*m_lightShadowPen);
 515             else
 516                 dc.SetPen(*m_darkShadowPen);
 517             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 518
 519             // Draw the top and bottom edges of the sash, if requested
 520             if (GetWindowStyle() & wxSP_FULLSASH)
 521             {
 522                 // Top
 523                 dc.SetPen(*m_hilightPen);
 524                 dc.DrawLine(m_sashPosition+1, m_borderSize, m_sashPosition+m_sashSize-1, m_borderSize);
 525
 526                 // Bottom
 527                 dc.SetPen(*m_darkShadowPen);
 528                 dc.DrawLine(m_sashPosition+1, h-m_borderSize-1, m_sashPosition+m_sashSize-1, h-m_borderSize-1);
 529             }
 530         }
 531         else // wxSPLIT_HORIZONTAL
 532         {
 533             dc.SetPen(*m_facePen);
 534             if (HasFlag( wxSP_SASH_AQUA ))
 535                 dc.SetBrush(*wxWHITE_BRUSH);
 536             else
 537                 dc.SetBrush(*m_faceBrush);
 538             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 539
 540             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 541
 542             dc.SetPen(*m_lightShadowPen);
 543             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 544
 545             dc.SetPen(*m_hilightPen);
 546             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 547
 548             if (!HasFlag( wxSP_SASH_AQUA ))
 549                 dc.SetPen(*m_mediumShadowPen);
 550             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 551
 552             if (HasFlag( wxSP_SASH_AQUA ))
 553                 dc.SetPen(*m_lightShadowPen);
 554             else
 555                 dc.SetPen(*m_darkShadowPen);
 556             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 557
 558             // Draw the left and right edges of the sash, if requested
 559             if (GetWindowStyle() & wxSP_FULLSASH)
 560             {
 561                 // Left
 562                 dc.SetPen(*m_hilightPen);
 563                 dc.DrawLine(m_borderSize, m_sashPosition, m_borderSize, m_sashPosition+m_sashSize);
 564
 565                 // Right
 566                 dc.SetPen(*m_darkShadowPen);
 567                 dc.DrawLine(w-m_borderSize-1, m_sashPosition+1, w-m_borderSize-1, m_sashPosition+m_sashSize-1);
 568             }
 569         }
 570     }
 571     else // !wxSP_3DSASH
 572     {
 573         dc.SetPen(*wxTRANSPARENT_PEN);
 574         dc.SetBrush(*m_faceBrush);
 575         if ( m_splitMode == wxSPLIT_VERTICAL )
 576         {
 577             int h1 = h-1;
 578             int y1 = 0;
 579             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 580                 h1 += 1; // Not sure why this is necessary...
 581             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 582             {
 583                 y1 = 2; h1 -= 3;
 584             }
 585             dc.DrawRectangle(m_sashPosition, y1, m_sashSize, h1);
 586         }
 587         else // wxSPLIT_HORIZONTAL
 588         {
 589             int w1 = w-1;
 590             int x1 = 0;
 591             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 592                 w1 ++;
 593             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 594             {
 595                 x1 = 2; w1 -= 3;
 596             }
 597             dc.DrawRectangle(x1, m_sashPosition, w1, m_sashSize);
 598         }
 599     }
 600
 601     dc.SetPen(wxNullPen);
 602     dc.SetBrush(wxNullBrush);
 603 }
 604
 605 // Draw the sash tracker (for whilst moving the sash)
 606 void wxSplitterWindow::DrawSashTracker(int x, int y)
 607 {
 608     int w, h;
 609     GetClientSize(&w, &h);
 610
 611     wxScreenDC screenDC;
 612     int x1, y1;
 613     int x2, y2;
 614
 615     if ( m_splitMode == wxSPLIT_VERTICAL )
 616     {
 617         x1 = x; y1 = 2;
 618         x2 = x; y2 = h-2;
 619
 620         if ( x1 > w )
 621         {
 622             x1 = w; x2 = w;
 623         }
 624         else if ( x1 < 0 )
 625         {
 626             x1 = 0; x2 = 0;
 627         }
 628     }
 629     else
 630     {
 631         x1 = 2; y1 = y;
 632         x2 = w-2; y2 = y;
 633
 634         if ( y1 > h )
 635         {
 636             y1 = h;
 637             y2 = h;
 638         }
 639         else if ( y1 < 0 )
 640         {
 641             y1 = 0;
 642             y2 = 0;
 643         }
 644     }
 645
 646     ClientToScreen(&x1, &y1);
 647     ClientToScreen(&x2, &y2);
 648
 649     screenDC.SetLogicalFunction(wxINVERT);
 650     screenDC.SetPen(*m_sashTrackerPen);
 651     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 652
 653     screenDC.DrawLine(x1, y1, x2, y2);
 654
 655     screenDC.SetLogicalFunction(wxCOPY);
 656
 657     screenDC.SetPen(wxNullPen);
 658     screenDC.SetBrush(wxNullBrush);
 659 }
 660
 661 int wxSplitterWindow::GetWindowSize() const
 662 {
 663     wxSize size = GetClientSize();
 664
 665     return m_splitMode == wxSPLIT_VERTICAL ? size.x : size.y;
 666 }
 667
 668 int wxSplitterWindow::AdjustSashPosition(int sashPos) const
 669 {
 670     int window_size = GetWindowSize();
 671
 672     wxWindow *win;
 673
 674     win = GetWindow1();
 675     if ( win )
 676     {
 677         // the window shouldn't be smaller than its own minimal size nor
 678         // smaller than the minimual pane size specified for this splitter
 679         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 680                                                       : win->GetMinHeight();
 681
 682         if ( minSize == -1 || m_minimumPaneSize > minSize )
 683             minSize = m_minimumPaneSize;
 684
 685         minSize += GetBorderSize();
 686
 687         if ( sashPos < minSize )
 688             sashPos = minSize;
 689     }
 690
 691     win = GetWindow2();
 692     if ( win )
 693     {
 694         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 695                                                       : win->GetMinHeight();
 696
 697         if ( minSize == -1 || m_minimumPaneSize > minSize )
 698             minSize = m_minimumPaneSize;
 699
 700         int maxSize = window_size - minSize - GetBorderSize();
 701         if ( sashPos > maxSize )
 702             sashPos = maxSize;
 703     }
 704
 705     return sashPos;
 706 }
 707
 708 bool wxSplitterWindow::DoSetSashPosition(int sashPos)
 709 {
 710     int newSashPosition = AdjustSashPosition(sashPos);
 711
 712     if ( newSashPosition == m_sashPosition )
 713         return FALSE;
 714
 715     m_sashPosition = newSashPosition;
 716
 717     return TRUE;
 718 }
 719
 720 void wxSplitterWindow::SetSashPositionAndNotify(int sashPos)
 721 {
 722     if ( DoSetSashPosition(sashPos) )
 723     {
 724         wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED, this);
 725         event.m_data.pos = m_sashPosition;
 726
 727         (void)DoSendEvent(event);
 728     }
 729 }
 730
 731 // Position and size subwindows.
 732 // Note that the border size applies to each subwindow, not
 733 // including the edges next to the sash.
 734 void wxSplitterWindow::SizeWindows()
 735 {
 736     // check if we have delayed setting the real sash position
 737     if ( m_requestedSashPosition != INT_MAX )
 738     {
 739         int newSashPosition = ConvertSashPosition(m_requestedSashPosition);
 740         if ( newSashPosition != m_sashPosition )
 741         {
 742             DoSetSashPosition(newSashPosition);
 743         }
 744
 745         if ( newSashPosition <= m_sashPosition
 746             && newSashPosition >= m_sashPosition - GetBorderSize() )
 747         {
 748             // don't update it any more
 749             m_requestedSashPosition = INT_MAX;
 750         }
 751     }
 752
 753     int w, h;
 754     GetClientSize(&w, &h);
 755
 756     if ( GetWindow1() && !GetWindow2() )
 757     {
 758         GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 759                               w - 2*GetBorderSize(), h - 2*GetBorderSize());
 760     }
 761     else if ( GetWindow1() && GetWindow2() )
 762     {
 763         if (GetSplitMode() == wxSPLIT_VERTICAL)
 764         {
 765             int x1 = GetBorderSize();
 766             int y1 = GetBorderSize();
 767             int w1 = GetSashPosition() - GetBorderSize();
 768             int h1 = h - 2*GetBorderSize();
 769
 770             int x2 = GetSashPosition() + GetSashSize();
 771             int y2 = GetBorderSize();
 772             int w2 = w - 2*GetBorderSize() - GetSashSize() - w1;
 773             int h2 = h - 2*GetBorderSize();
 774
 775             GetWindow1()->SetSize(x1, y1, w1, h1);
 776             GetWindow2()->SetSize(x2, y2, w2, h2);
 777         }
 778         else
 779         {
 780             GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 781                 w - 2*GetBorderSize(), GetSashPosition() - GetBorderSize());
 782             GetWindow2()->SetSize(GetBorderSize(), GetSashPosition() + GetSashSize(),
 783                 w - 2*GetBorderSize(), h - 2*GetBorderSize() - GetSashSize() - (GetSashPosition() - GetBorderSize()));
 784         }
 785     }
 786     wxClientDC dc(this);
 787     if ( GetBorderSize() > 0 )
 788         DrawBorders(dc);
 789     DrawSash(dc);
 790
 791     SetNeedUpdating(FALSE);
 792 }
 793
 794 // Set pane for unsplit window
 795 void wxSplitterWindow::Initialize(wxWindow *window)
 796 {
 797     wxASSERT_MSG( window && window->GetParent() == this,
 798                   _T("windows in the splitter should have it as parent!") );
 799
 800     m_windowOne = window;
 801     m_windowTwo = (wxWindow *) NULL;
 802     DoSetSashPosition(0);
 803 }
 804
 805 // Associates the given window with window 2, drawing the appropriate sash
 806 // and changing the split mode.
 807 // Does nothing and returns FALSE if the window is already split.
 808 bool wxSplitterWindow::DoSplit(wxSplitMode mode,
 809                                wxWindow *window1, wxWindow *window2,
 810                                int sashPosition)
 811 {
 812     if ( IsSplit() )
 813         return FALSE;
 814
 815     wxCHECK_MSG( window1 && window2, FALSE,
 816                  _T("can not split with NULL window(s)") );
 817
 818     wxCHECK_MSG( window1->GetParent() == this && window2->GetParent() == this, FALSE,
 819                   _T("windows in the splitter should have it as parent!") );
 820
 821     m_splitMode = mode;
 822     m_windowOne = window1;
 823     m_windowTwo = window2;
 824
 825     // remember the sash position we want to set for later if we can't set it
 826     // right now (e.g. because the window is too small)
 827     m_requestedSashPosition = sashPosition;
 828
 829     DoSetSashPosition(ConvertSashPosition(sashPosition));
 830
 831     SizeWindows();
 832
 833     return TRUE;
 834 }
 835
 836 int wxSplitterWindow::ConvertSashPosition(int sashPosition) const
 837 {
 838     if ( sashPosition > 0 )
 839     {
 840         return sashPosition;
 841     }
 842     else if ( sashPosition < 0 )
 843     {
 844         // It's negative so adding is subtracting
 845         return GetWindowSize() + sashPosition;
 846     }
 847     else // sashPosition == 0
 848     {
 849         // default, put it in the centre
 850         return GetWindowSize() / 2;
 851     }
 852 }
 853
 854 // Remove the specified (or second) window from the view
 855 // Doesn't actually delete the window.
 856 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 857 {
 858     if ( ! IsSplit() )
 859         return FALSE;
 860
 861     wxWindow *win = NULL;
 862     if ( toRemove == NULL || toRemove == m_windowTwo)
 863     {
 864         win = m_windowTwo ;
 865         m_windowTwo = (wxWindow *) NULL;
 866     }
 867     else if ( toRemove == m_windowOne )
 868     {
 869         win = m_windowOne ;
 870         m_windowOne = m_windowTwo;
 871         m_windowTwo = (wxWindow *) NULL;
 872     }
 873     else
 874     {
 875         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 876
 877         return FALSE;
 878     }
 879
 880     win->Show(FALSE);
 881     DoSetSashPosition(0);
 882     SizeWindows();
 883
 884     return TRUE;
 885 }
 886
 887 // Replace a window with another one
 888 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 889 {
 890     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 891     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 892
 893     if ( winOld == m_windowTwo )
 894     {
 895         m_windowTwo = winNew;
 896     }
 897     else if ( winOld == m_windowOne )
 898     {
 899         m_windowOne = winNew;
 900     }
 901     else
 902     {
 903         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 904
 905         return FALSE;
 906     }
 907
 908     SizeWindows();
 909
 910     return TRUE;
 911 }
 912
 913 void wxSplitterWindow::SetMinimumPaneSize(int min)
 914 {
 915     m_minimumPaneSize = min;
 916     SetSashPosition(m_sashPosition); // re-check limits
 917 }
 918
 919 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 920 {
 921     DoSetSashPosition(position);
 922
 923     if ( redraw )
 924     {
 925         SizeWindows();
 926     }
 927 }
 928
 929 // Initialize colours
 930 void wxSplitterWindow::InitColours()
 931 {
 932     wxDELETE( m_facePen );
 933     wxDELETE( m_faceBrush );
 934     wxDELETE( m_mediumShadowPen );
 935     wxDELETE( m_darkShadowPen );
 936     wxDELETE( m_lightShadowPen );
 937     wxDELETE( m_hilightPen );
 938
 939     // Shadow colours
 940 #ifndef __WIN16__
 941     wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
 942     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 943     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 944
 945     wxColour mediumShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW));
 946     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 947
 948     wxColour darkShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW));
 949     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 950
 951     wxColour lightShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT));
 952     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 953
 954     wxColour hilightColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT));
 955     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 956 #else
 957     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 958     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 959     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 960     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 961     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 962     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 963 #endif // __WIN16__
 964 }
 965
 966 bool wxSplitterWindow::DoSendEvent(wxSplitterEvent& event)
 967 {
 968     return !GetEventHandler()->ProcessEvent(event) || event.IsAllowed();
 969 }
 970
 971 // ---------------------------------------------------------------------------
 972 // wxSplitterWindow virtual functions: they now just generate the events
 973 // ---------------------------------------------------------------------------
 974
 975 bool wxSplitterWindow::OnSashPositionChange(int WXUNUSED(newSashPosition))
 976 {
 977     // always allow by default
 978     return TRUE;
 979 }
 980
 981 int wxSplitterWindow::OnSashPositionChanging(int newSashPosition)
 982 {
 983     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 984     const int UNSPLIT_THRESHOLD = 4;
 985
 986     // first of all, check if OnSashPositionChange() doesn't forbid this change
 987     if ( !OnSashPositionChange(newSashPosition) )
 988     {
 989         // it does
 990         return -1;
 991     }
 992
 993     // Obtain relevant window dimension for bottom / right threshold check
 994     int window_size = GetWindowSize();
 995
 996     bool unsplit_scenario = FALSE;
 997     if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 998     {
 999         // Do edge detection if unsplit premitted
1000         if ( newSashPosition <= UNSPLIT_THRESHOLD )
1001         {
1002             // threshold top / left check
1003             newSashPosition = 0;
1004             unsplit_scenario = TRUE;
1005         }
1006         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
1007         {
1008             // threshold bottom/right check
1009             newSashPosition = window_size;
1010             unsplit_scenario = TRUE;
1011         }
1012     }
1013
1014     if ( !unsplit_scenario )
1015     {
1016         // If resultant pane would be too small, enlarge it
1017         newSashPosition = AdjustSashPosition(newSashPosition);
1018     }
1019
1020     // If the result is out of bounds it means minimum size is too big,
1021     // so split window in half as best compromise.
1022     if ( newSashPosition < 0 || newSashPosition > window_size )
1023         newSashPosition = window_size / 2;
1024
1025     // now let the event handler have it
1026     //
1027     // FIXME: shouldn't we do it before the adjustments above so as to ensure
1028     //        that the sash position is always reasonable?
1029     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING, this);
1030     event.m_data.pos = newSashPosition;
1031
1032     if ( !DoSendEvent(event) )
1033     {
1034         // the event handler vetoed the change
1035         newSashPosition = -1;
1036     }
1037     else
1038     {
1039         // it could have been changed by it
1040         newSashPosition = event.GetSashPosition();
1041     }
1042
1043     return newSashPosition;
1044 }
1045
1046 // Called when the sash is double-clicked. The default behaviour is to remove
1047 // the sash if the minimum pane size is zero.
1048 void wxSplitterWindow::OnDoubleClickSash(int x, int y)
1049 {
1050     wxCHECK_RET(m_windowTwo, wxT("splitter: no window to remove"));
1051
1052     // new code should handle events instead of using the virtual functions
1053     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED, this);
1054     event.m_data.pt.x = x;
1055     event.m_data.pt.y = y;
1056     if ( DoSendEvent(event) )
1057     {
1058         if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
1059         {
1060             wxWindow* win = m_windowTwo;
1061             if (Unsplit(win))
1062                 OnUnsplit(win);
1063         }
1064     }
1065     //else: blocked by user
1066 }
1067
1068 void wxSplitterWindow::OnUnsplit(wxWindow *winRemoved)
1069 {
1070     // do it before calling the event handler which may delete the window
1071     winRemoved->Show(FALSE);
1072
1073     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
1074     event.m_data.win = winRemoved;
1075
1076     (void)DoSendEvent(event);
1077 }
1078
1079 #if defined( __WXMSW__ ) || defined( __WXMAC__)
1080
1081 // this is currently called (and needed) under MSW only...
1082 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& event)
1083 {
1084     // if we don't do it, the resizing cursor might be set for child window:
1085     // and like this we explicitly say that our cursor should not be used for
1086     // children windows which overlap us
1087
1088     if ( SashHitTest(event.GetX(), event.GetY()) )
1089     {
1090         // default processing is ok
1091         event.Skip();
1092     }
1093     //else: do nothing, in particular, don't call Skip()
1094 }
1095
1096 #endif // wxMSW
1097