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 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 #include "wx/utils.h"
  37
  38 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED)
  39 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING)
  40 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED)
  41 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_UNSPLIT)
  42
  43 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  44 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxNotifyEvent)
  45
  46 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  47     EVT_PAINT(wxSplitterWindow::OnPaint)
  48     EVT_SIZE(wxSplitterWindow::OnSize)
  49     EVT_IDLE(wxSplitterWindow::OnIdle)
  50     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  51
  52 #ifdef __WXMSW__
  53     EVT_SET_CURSOR(wxSplitterWindow::OnSetCursor)
  54 #endif // wxMSW
  55
  56     WX_EVENT_TABLE_CONTROL_CONTAINER(wxSplitterWindow)
  57 END_EVENT_TABLE()
  58
  59 WX_DELEGATE_TO_CONTROL_CONTAINER(wxSplitterWindow);
  60
  61 bool wxSplitterWindow::Create(wxWindow *parent, wxWindowID id,
  62                                    const wxPoint& pos,
  63                                    const wxSize& size,
  64                                    long style,
  65                                    const wxString& name)
  66 {
  67     // allow TABbing from one window to the other
  68     style |= wxTAB_TRAVERSAL;
  69
  70     if (!wxWindow::Create(parent, id, pos, size, style, name))
  71         return FALSE;
  72
  73     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  74
  75     if ( style & wxSP_3DSASH )
  76         m_sashSize = 7;
  77     else
  78         m_sashSize = 3;
  79
  80     if ( style & wxSP_3DBORDER )
  81         m_borderSize = 2;
  82     else if ( style & wxSP_BORDER )
  83         m_borderSize = 1;
  84     else
  85         m_borderSize = 0;
  86
  87 #ifdef __WXMAC__
  88     int major,minor;
  89     wxGetOsVersion( &major, &minor );
  90     if (major >= 10)
  91         m_windowStyle |= wxSP_SASH_AQUA;
  92 #endif
  93
  94     return TRUE;
  95 }
  96
  97 void wxSplitterWindow::Init()
  98 {
  99     m_container.SetContainerWindow(this);
 100
 101     m_splitMode = wxSPLIT_VERTICAL;
 102     m_permitUnsplitAlways = TRUE;
 103     m_windowOne = (wxWindow *) NULL;
 104     m_windowTwo = (wxWindow *) NULL;
 105     m_dragMode = wxSPLIT_DRAG_NONE;
 106     m_oldX = 0;
 107     m_oldY = 0;
 108     m_firstX = 0;
 109     m_firstY = 0;
 110     m_sashSize = 7;
 111     m_borderSize = 2;
 112     m_sashPosition = m_requestedSashPosition = 0;
 113     m_minimumPaneSize = 0;
 114     m_sashCursorWE = wxCursor(wxCURSOR_SIZEWE);
 115     m_sashCursorNS = wxCursor(wxCURSOR_SIZENS);
 116     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
 117     m_lightShadowPen = (wxPen *) NULL;
 118     m_mediumShadowPen = (wxPen *) NULL;
 119     m_darkShadowPen = (wxPen *) NULL;
 120     m_faceBrush = (wxBrush *) NULL;
 121     m_facePen = (wxPen *) NULL;
 122     m_hilightPen = (wxPen *) NULL;
 123
 124     m_borderSize = 0;
 125     m_sashSize = 3;
 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     // reset the cursor
 172 #ifdef __WXMOTIF__
 173     SetCursor(* wxSTANDARD_CURSOR);
 174 #elif defined(__WXMSW__)
 175     SetCursor(wxCursor());
 176 #endif
 177
 178     if (GetWindowStyle() & wxSP_NOSASH)
 179         return;
 180
 181     // with wxSP_LIVE_UPDATE style the splitter windows are always resized
 182     // following the mouse movement while it drags the sash, without it we only
 183     // draw the sash at the new position but only resize the windows when the
 184     // dragging is finished
 185     bool isLive = (GetWindowStyleFlag() & wxSP_LIVE_UPDATE) != 0;
 186
 187     if (event.LeftDown())
 188     {
 189         if ( SashHitTest(x, y) )
 190         {
 191             CaptureMouse();
 192
 193             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 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         ReleaseMouse();
 216
 217         // Erase old tracker
 218         if ( !isLive )
 219         {
 220             DrawSashTracker(m_oldX, m_oldY);
 221         }
 222
 223         // the position of the click doesn't exactly correspond to
 224         // m_sashPosition, rather it changes it by the distance by which the
 225         // mouse has moved
 226         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 227
 228         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 229         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 230         if ( posSashNew == -1 )
 231         {
 232             // change not allowed
 233             return;
 234         }
 235
 236         if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 237         {
 238             // Deal with possible unsplit scenarios
 239             if ( posSashNew == 0 )
 240             {
 241                 // We remove the first window from the view
 242                 wxWindow *removedWindow = m_windowOne;
 243                 m_windowOne = m_windowTwo;
 244                 m_windowTwo = (wxWindow *) NULL;
 245                 OnUnsplit(removedWindow);
 246                 SetSashPositionAndNotify(0);
 247             }
 248             else if ( posSashNew == GetWindowSize() )
 249             {
 250                 // We remove the second window from the view
 251                 wxWindow *removedWindow = m_windowTwo;
 252                 m_windowTwo = (wxWindow *) NULL;
 253                 OnUnsplit(removedWindow);
 254                 SetSashPositionAndNotify(0);
 255             }
 256             else
 257             {
 258                 SetSashPositionAndNotify(posSashNew);
 259             }
 260         }
 261         else
 262         {
 263             SetSashPositionAndNotify(posSashNew);
 264         }
 265
 266         SizeWindows();
 267     }  // left up && dragging
 268     else if (event.Moving() && !event.Dragging())
 269     {
 270         // Just change the cursor if required
 271         if ( SashHitTest(x, y) )
 272         {
 273             SetResizeCursor();
 274         }
 275 #if defined(__WXGTK__) || defined(__WXMSW__)
 276         else
 277         {
 278             // We must set the normal cursor in MSW, because
 279             // if the child window doesn't have a cursor, the
 280             // parent's (splitter window) will be used, and this
 281             // must be the standard cursor.
 282
 283             // where else do we unset the cursor?
 284             SetCursor(* wxSTANDARD_CURSOR);
 285         }
 286 #endif // __WXGTK__
 287     }
 288     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 289     {
 290 #ifdef __WXMSW__
 291         // Otherwise, the cursor sometimes reverts to the normal cursor
 292         // during dragging.
 293         SetResizeCursor();
 294 #endif // __WXMSW__
 295
 296         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 297
 298         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 299         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 300         if ( posSashNew == -1 )
 301         {
 302             // change not allowed
 303             return;
 304         }
 305
 306         if ( posSashNew == m_sashPosition )
 307             return;
 308
 309         // Erase old tracker
 310         if ( !isLive )
 311         {
 312             DrawSashTracker(m_oldX, m_oldY);
 313         }
 314
 315         if (m_splitMode == wxSPLIT_VERTICAL)
 316             x = posSashNew;
 317         else
 318             y = posSashNew;
 319
 320         // Remember old positions
 321         m_oldX = x;
 322         m_oldY = y;
 323
 324 #ifdef __WXMSW__
 325         // As we captured the mouse, we may get the mouse events from outside
 326         // our window - for example, negative values in x, y. This has a weird
 327         // consequence under MSW where we use unsigned values sometimes and
 328         // signed ones other times: the coordinates turn as big positive
 329         // numbers and so the sash is drawn on the *right* side of the window
 330         // instead of the left (or bottom instead of top). Correct this.
 331         if ( (short)m_oldX < 0 )
 332             m_oldX = 0;
 333         if ( (short)m_oldY < 0 )
 334             m_oldY = 0;
 335 #endif // __WXMSW__
 336
 337         // Draw new one
 338         if ( !isLive )
 339         {
 340             m_sashPositionCurrent = posSashNew;
 341
 342             DrawSashTracker(m_oldX, m_oldY);
 343         }
 344         else
 345         {
 346             SetSashPositionAndNotify(posSashNew);
 347             m_needUpdating = TRUE;
 348         }
 349     }
 350     else if ( event.LeftDClick() )
 351     {
 352         OnDoubleClickSash(x, y);
 353     }
 354 }
 355
 356 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 357 {
 358     // only process this message if we're not iconized - otherwise iconizing
 359     // and restoring a window containing the splitter has a funny side effect
 360     // of changing the splitter position!
 361     wxWindow *parent = GetParent();
 362     while ( parent && !parent->IsTopLevel() )
 363     {
 364         parent = parent->GetParent();
 365     }
 366
 367     bool iconized = FALSE;
 368
 369     // wxMotif doesn't yet have a wxTopLevelWindow implementation
 370 #ifdef __WXMOTIF__
 371     wxFrame *winTop = wxDynamicCast(parent, wxFrame);
 372 #else
 373     wxTopLevelWindow *winTop = wxDynamicCast(parent, wxTopLevelWindow);
 374 #endif
 375     if ( winTop )
 376     {
 377         iconized = winTop->IsIconized();
 378     }
 379 #ifndef __WXMOTIF__
 380     else
 381     {
 382         wxFAIL_MSG(wxT("should have a top level parent!"));
 383
 384         iconized = FALSE;
 385     }
 386 #endif
 387
 388     if ( iconized )
 389     {
 390         event.Skip();
 391
 392         return;
 393     }
 394
 395     int cw, ch;
 396     GetClientSize( &cw, &ch );
 397     if ( m_windowTwo )
 398     {
 399         if ( m_splitMode == wxSPLIT_VERTICAL )
 400         {
 401             if ( m_sashPosition >= (cw - 5) )
 402                 SetSashPositionAndNotify(wxMax(10, cw - 40));
 403         }
 404         else // m_splitMode == wxSPLIT_HORIZONTAL
 405         {
 406             if ( m_sashPosition >= (ch - 5) )
 407                 SetSashPositionAndNotify(wxMax(10, ch - 40));
 408         }
 409     }
 410
 411     SizeWindows();
 412 }
 413
 414 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 415 {
 416     if ( m_windowTwo == NULL || m_sashPosition == 0)
 417         return FALSE; // No sash
 418
 419     if ( m_splitMode == wxSPLIT_VERTICAL )
 420     {
 421         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 422             return TRUE;
 423         else
 424             return FALSE;
 425     }
 426     else
 427     {
 428         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 429             return TRUE;
 430         else
 431             return FALSE;
 432     }
 433 }
 434
 435 // Draw 3D effect borders
 436 void wxSplitterWindow::DrawBorders(wxDC& dc)
 437 {
 438     int w, h;
 439     GetClientSize(&w, &h);
 440
 441     if ( GetWindowStyleFlag() & wxSP_3DBORDER )
 442     {
 443
 444         dc.SetPen(*m_facePen);
 445         dc.SetBrush(*m_faceBrush);
 446         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 447         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 448         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 449         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 450
 451         dc.SetPen(*m_mediumShadowPen);
 452         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 453         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 454
 455         dc.SetPen(*m_darkShadowPen);
 456         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 457         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 458
 459         dc.SetPen(*m_hilightPen);
 460         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 461         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.
 462                                      /// Anyway, h is required for MSW.
 463
 464         dc.SetPen(*m_lightShadowPen);
 465         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 466         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 467     }
 468     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 469     {
 470         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 471         dc.SetPen(*wxBLACK_PEN);
 472         dc.DrawRectangle(0, 0, w-1, h-1);
 473     }
 474
 475     dc.SetPen(wxNullPen);
 476     dc.SetBrush(wxNullBrush);
 477 }
 478
 479 // Draw the sash
 480 void wxSplitterWindow::DrawSash(wxDC& dc)
 481 {
 482     if ( m_sashPosition == 0 || !m_windowTwo)
 483         return;
 484     if (GetWindowStyle() & wxSP_NOSASH)
 485         return;
 486
 487     int w, h;
 488     GetClientSize(&w, &h);
 489
 490     if ( GetWindowStyleFlag() & wxSP_3DSASH )
 491     {
 492         if ( m_splitMode == wxSPLIT_VERTICAL )
 493         {
 494             dc.SetPen(*m_facePen);
 495
 496             if (HasFlag( wxSP_SASH_AQUA ))
 497                 dc.SetBrush(*wxWHITE_BRUSH);
 498             else
 499                 dc.SetBrush(*m_faceBrush);
 500             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 501
 502             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 503
 504             dc.SetPen(*m_lightShadowPen);
 505             int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 506             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 507
 508             dc.SetPen(*m_hilightPen);
 509             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 510
 511             if (!HasFlag( wxSP_SASH_AQUA ))
 512                 dc.SetPen(*m_mediumShadowPen);
 513
 514             int yMedium = m_borderSize ? h-m_borderSize+1 : h ;
 515             dc.DrawLine(m_sashPosition+m_sashSize-2, xShadow, m_sashPosition+m_sashSize-2, yMedium);
 516
 517             if (HasFlag( wxSP_SASH_AQUA ))
 518                 dc.SetPen(*m_lightShadowPen);
 519             else
 520                 dc.SetPen(*m_darkShadowPen);
 521             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 522
 523             // Draw the top and bottom edges of the sash, if requested
 524             if (GetWindowStyle() & wxSP_FULLSASH)
 525             {
 526                 // Top
 527                 dc.SetPen(*m_hilightPen);
 528                 dc.DrawLine(m_sashPosition+1, m_borderSize, m_sashPosition+m_sashSize-1, m_borderSize);
 529
 530                 // Bottom
 531                 dc.SetPen(*m_darkShadowPen);
 532                 dc.DrawLine(m_sashPosition+1, h-m_borderSize-1, m_sashPosition+m_sashSize-1, h-m_borderSize-1);
 533             }
 534         }
 535         else
 536         {
 537             dc.SetPen(*m_facePen);
 538             if (HasFlag( wxSP_SASH_AQUA ))
 539                 dc.SetBrush(*wxWHITE_BRUSH);
 540             else
 541                 dc.SetBrush(*m_faceBrush);
 542             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 543
 544             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 545
 546             dc.SetPen(*m_lightShadowPen);
 547             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 548
 549             dc.SetPen(*m_hilightPen);
 550             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 551
 552             if (!HasFlag( wxSP_SASH_AQUA ))
 553                 dc.SetPen(*m_mediumShadowPen);
 554             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 555
 556             if (HasFlag( wxSP_SASH_AQUA ))
 557                 dc.SetPen(*m_lightShadowPen);
 558             else
 559                 dc.SetPen(*m_darkShadowPen);
 560             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 561
 562             // Draw the left and right edges of the sash, if requested
 563             if (GetWindowStyle() & wxSP_FULLSASH)
 564             {
 565                 // Left
 566                 dc.SetPen(*m_hilightPen);
 567                 dc.DrawLine(m_borderSize, m_sashPosition, m_borderSize, m_sashPosition+m_sashSize);
 568
 569                 // Right
 570                 dc.SetPen(*m_darkShadowPen);
 571                 dc.DrawLine(w-m_borderSize-1, m_sashPosition+1, w-m_borderSize-1, m_sashPosition+m_sashSize-1);
 572             }
 573         }
 574     }
 575     else
 576     {
 577         if ( m_splitMode == wxSPLIT_VERTICAL )
 578         {
 579             dc.SetPen(*wxBLACK_PEN);
 580             dc.SetBrush(*wxBLACK_BRUSH);
 581             int h1 = h-1;
 582             int y1 = 0;
 583             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 584                 h1 += 1; // Not sure why this is necessary...
 585             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 586             {
 587                 y1 = 2; h1 -= 3;
 588             }
 589             dc.DrawRectangle(m_sashPosition, y1, m_sashSize, h1);
 590         }
 591         else
 592         {
 593             dc.SetPen(*wxBLACK_PEN);
 594             dc.SetBrush(*wxBLACK_BRUSH);
 595             int w1 = w-1;
 596             int x1 = 0;
 597             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 598                 w1 ++;
 599             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 600             {
 601                 x1 = 2; w1 -= 3;
 602             }
 603             dc.DrawRectangle(x1, m_sashPosition, w1, m_sashSize);
 604         }
 605
 606     }
 607
 608     dc.SetPen(wxNullPen);
 609     dc.SetBrush(wxNullBrush);
 610 }
 611
 612 // Draw the sash tracker (for whilst moving the sash)
 613 void wxSplitterWindow::DrawSashTracker(int x, int y)
 614 {
 615     int w, h;
 616     GetClientSize(&w, &h);
 617
 618     wxScreenDC screenDC;
 619     int x1, y1;
 620     int x2, y2;
 621
 622     if ( m_splitMode == wxSPLIT_VERTICAL )
 623     {
 624         x1 = x; y1 = 2;
 625         x2 = x; y2 = h-2;
 626
 627         if ( x1 > w )
 628         {
 629             x1 = w; x2 = w;
 630         }
 631         else if ( x1 < 0 )
 632         {
 633             x1 = 0; x2 = 0;
 634         }
 635     }
 636     else
 637     {
 638         x1 = 2; y1 = y;
 639         x2 = w-2; y2 = y;
 640
 641         if ( y1 > h )
 642         {
 643             y1 = h;
 644             y2 = h;
 645         }
 646         else if ( y1 < 0 )
 647         {
 648             y1 = 0;
 649             y2 = 0;
 650         }
 651     }
 652
 653     ClientToScreen(&x1, &y1);
 654     ClientToScreen(&x2, &y2);
 655
 656     screenDC.SetLogicalFunction(wxINVERT);
 657     screenDC.SetPen(*m_sashTrackerPen);
 658     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 659
 660     screenDC.DrawLine(x1, y1, x2, y2);
 661
 662     screenDC.SetLogicalFunction(wxCOPY);
 663
 664     screenDC.SetPen(wxNullPen);
 665     screenDC.SetBrush(wxNullBrush);
 666 }
 667
 668 int wxSplitterWindow::GetWindowSize() const
 669 {
 670     wxSize size = GetClientSize();
 671
 672     return m_splitMode == wxSPLIT_VERTICAL ? size.x : size.y;
 673 }
 674
 675 int wxSplitterWindow::AdjustSashPosition(int sashPos) const
 676 {
 677     int window_size = GetWindowSize();
 678
 679     wxWindow *win;
 680
 681     win = GetWindow1();
 682     if ( win )
 683     {
 684         // the window shouldn't be smaller than its own minimal size nor
 685         // smaller than the minimual pane size specified for this splitter
 686         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 687                                                       : win->GetMinHeight();
 688
 689         if ( minSize == -1 || m_minimumPaneSize > minSize )
 690             minSize = m_minimumPaneSize;
 691
 692         minSize += GetBorderSize();
 693
 694         if ( sashPos < minSize )
 695             sashPos = minSize;
 696     }
 697
 698     win = GetWindow2();
 699     if ( win )
 700     {
 701         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 702                                                       : win->GetMinHeight();
 703
 704         if ( minSize == -1 || m_minimumPaneSize > minSize )
 705             minSize = m_minimumPaneSize;
 706
 707         int maxSize = window_size - minSize - GetBorderSize();
 708         if ( sashPos > maxSize )
 709             sashPos = maxSize;
 710     }
 711
 712     return sashPos;
 713 }
 714
 715 bool wxSplitterWindow::DoSetSashPosition(int sashPos)
 716 {
 717     int newSashPosition = AdjustSashPosition(sashPos);
 718
 719     if ( newSashPosition == m_sashPosition )
 720         return FALSE;
 721
 722     m_sashPosition = newSashPosition;
 723
 724     return TRUE;
 725 }
 726
 727 void wxSplitterWindow::SetSashPositionAndNotify(int sashPos)
 728 {
 729     if ( DoSetSashPosition(sashPos) )
 730     {
 731         wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED, this);
 732         event.m_data.pos = m_sashPosition;
 733
 734         (void)DoSendEvent(event);
 735     }
 736 }
 737
 738 // Position and size subwindows.
 739 // Note that the border size applies to each subwindow, not
 740 // including the edges next to the sash.
 741 void wxSplitterWindow::SizeWindows()
 742 {
 743     // check if we have delayed setting the real sash position
 744     if ( m_requestedSashPosition != INT_MAX )
 745     {
 746         int newSashPosition = ConvertSashPosition(m_requestedSashPosition);
 747         if ( newSashPosition != m_sashPosition )
 748         {
 749             DoSetSashPosition(newSashPosition);
 750         }
 751
 752         if ( newSashPosition == m_sashPosition )
 753         {
 754             // don't update it any more
 755             m_requestedSashPosition = INT_MAX;
 756         }
 757     }
 758
 759     int w, h;
 760     GetClientSize(&w, &h);
 761
 762     if ( GetWindow1() && !GetWindow2() )
 763     {
 764         GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 765                               w - 2*GetBorderSize(), h - 2*GetBorderSize());
 766     }
 767     else if ( GetWindow1() && GetWindow2() )
 768     {
 769         if (GetSplitMode() == wxSPLIT_VERTICAL)
 770         {
 771             int x1 = GetBorderSize();
 772             int y1 = GetBorderSize();
 773             int w1 = GetSashPosition() - GetBorderSize();
 774             int h1 = h - 2*GetBorderSize();
 775
 776             int x2 = GetSashPosition() + GetSashSize();
 777             int y2 = GetBorderSize();
 778             int w2 = w - 2*GetBorderSize() - GetSashSize() - w1;
 779             int h2 = h - 2*GetBorderSize();
 780
 781             GetWindow1()->SetSize(x1, y1, w1, h1);
 782             GetWindow2()->SetSize(x2, y2, w2, h2);
 783         }
 784         else
 785         {
 786             GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 787                 w - 2*GetBorderSize(), GetSashPosition() - GetBorderSize());
 788             GetWindow2()->SetSize(GetBorderSize(), GetSashPosition() + GetSashSize(),
 789                 w - 2*GetBorderSize(), h - 2*GetBorderSize() - GetSashSize() - (GetSashPosition() - GetBorderSize()));
 790         }
 791     }
 792     wxClientDC dc(this);
 793     if ( GetBorderSize() > 0 )
 794         DrawBorders(dc);
 795     DrawSash(dc);
 796
 797     SetNeedUpdating(FALSE);
 798 }
 799
 800 // Set pane for unsplit window
 801 void wxSplitterWindow::Initialize(wxWindow *window)
 802 {
 803     m_windowOne = window;
 804     m_windowTwo = (wxWindow *) NULL;
 805     DoSetSashPosition(0);
 806 }
 807
 808 // Associates the given window with window 2, drawing the appropriate sash
 809 // and changing the split mode.
 810 // Does nothing and returns FALSE if the window is already split.
 811 bool wxSplitterWindow::DoSplit(wxSplitMode mode,
 812                                wxWindow *window1, wxWindow *window2,
 813                                int sashPosition)
 814 {
 815     if ( IsSplit() )
 816         return FALSE;
 817
 818     m_splitMode = mode;
 819     m_windowOne = window1;
 820     m_windowTwo = window2;
 821
 822     // remember the sash position we want to set for later if we can't set it
 823     // right now (e.g. because the window is too small)
 824     m_requestedSashPosition = sashPosition;
 825
 826     DoSetSashPosition(ConvertSashPosition(sashPosition));
 827
 828     SizeWindows();
 829
 830     return TRUE;
 831 }
 832
 833 int wxSplitterWindow::ConvertSashPosition(int sashPosition) const
 834 {
 835     if ( sashPosition > 0 )
 836     {
 837         return sashPosition;
 838     }
 839     else if ( sashPosition < 0 )
 840     {
 841         // It's negative so adding is subtracting
 842         return GetWindowSize() + sashPosition;
 843     }
 844     else // sashPosition == 0
 845     {
 846         // default, put it in the centre
 847         return GetWindowSize() / 2;
 848     }
 849 }
 850
 851 // Remove the specified (or second) window from the view
 852 // Doesn't actually delete the window.
 853 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 854 {
 855     if ( ! IsSplit() )
 856         return FALSE;
 857
 858     wxWindow *win = NULL;
 859     if ( toRemove == NULL || toRemove == m_windowTwo)
 860     {
 861         win = m_windowTwo ;
 862         m_windowTwo = (wxWindow *) NULL;
 863     }
 864     else if ( toRemove == m_windowOne )
 865     {
 866         win = m_windowOne ;
 867         m_windowOne = m_windowTwo;
 868         m_windowTwo = (wxWindow *) NULL;
 869     }
 870     else
 871     {
 872         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 873
 874         return FALSE;
 875     }
 876
 877     OnUnsplit(win);
 878     DoSetSashPosition(0);
 879     SizeWindows();
 880
 881     return TRUE;
 882 }
 883
 884 // Replace a window with another one
 885 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 886 {
 887     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 888     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 889
 890     if ( winOld == m_windowTwo )
 891     {
 892         m_windowTwo = winNew;
 893     }
 894     else if ( winOld == m_windowOne )
 895     {
 896         m_windowOne = winNew;
 897     }
 898     else
 899     {
 900         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 901
 902         return FALSE;
 903     }
 904
 905     SizeWindows();
 906
 907     return TRUE;
 908 }
 909
 910 void wxSplitterWindow::SetMinimumPaneSize(int min)
 911 {
 912     m_minimumPaneSize = min;
 913     SetSashPosition(m_sashPosition); // re-check limits
 914 }
 915
 916 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 917 {
 918     DoSetSashPosition(position);
 919
 920     if ( redraw )
 921     {
 922         SizeWindows();
 923     }
 924 }
 925
 926 // Initialize colours
 927 void wxSplitterWindow::InitColours()
 928 {
 929     wxDELETE( m_facePen );
 930     wxDELETE( m_faceBrush );
 931     wxDELETE( m_mediumShadowPen );
 932     wxDELETE( m_darkShadowPen );
 933     wxDELETE( m_lightShadowPen );
 934     wxDELETE( m_hilightPen );
 935
 936     // Shadow colours
 937 #ifndef __WIN16__
 938     wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
 939     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 940     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 941
 942     wxColour mediumShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW));
 943     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 944
 945     wxColour darkShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW));
 946     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 947
 948     wxColour lightShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT));
 949     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 950
 951     wxColour hilightColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT));
 952     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 953 #else
 954     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 955     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 956     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 957     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 958     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 959     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 960 #endif // __WIN16__
 961 }
 962
 963 bool wxSplitterWindow::DoSendEvent(wxSplitterEvent& event)
 964 {
 965     return !GetEventHandler()->ProcessEvent(event) || event.IsAllowed();
 966 }
 967
 968 // ---------------------------------------------------------------------------
 969 // wxSplitterWindow virtual functions: they now just generate the events
 970 // ---------------------------------------------------------------------------
 971
 972 bool wxSplitterWindow::OnSashPositionChange(int WXUNUSED(newSashPosition))
 973 {
 974     // always allow by default
 975     return TRUE;
 976 }
 977
 978 int wxSplitterWindow::OnSashPositionChanging(int newSashPosition)
 979 {
 980     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 981     const int UNSPLIT_THRESHOLD = 4;
 982
 983     // first of all, check if OnSashPositionChange() doesn't forbid this change
 984     if ( !OnSashPositionChange(newSashPosition) )
 985     {
 986         // it does
 987         return -1;
 988     }
 989
 990     // Obtain relevant window dimension for bottom / right threshold check
 991     int window_size = GetWindowSize();
 992
 993     bool unsplit_scenario = FALSE;
 994     if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 995     {
 996         // Do edge detection if unsplit premitted
 997         if ( newSashPosition <= UNSPLIT_THRESHOLD )
 998         {
 999             // threshold top / left check
1000             newSashPosition = 0;
1001             unsplit_scenario = TRUE;
1002         }
1003         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
1004         {
1005             // threshold bottom/right check
1006             newSashPosition = window_size;
1007             unsplit_scenario = TRUE;
1008         }
1009     }
1010
1011     if ( !unsplit_scenario )
1012     {
1013         // If resultant pane would be too small, enlarge it
1014         newSashPosition = AdjustSashPosition(newSashPosition);
1015     }
1016
1017     // If the result is out of bounds it means minimum size is too big,
1018     // so split window in half as best compromise.
1019     if ( newSashPosition < 0 || newSashPosition > window_size )
1020         newSashPosition = window_size / 2;
1021
1022     // now let the event handler have it
1023     //
1024     // FIXME: shouldn't we do it before the adjustments above so as to ensure
1025     //        that the sash position is always reasonable?
1026     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING, this);
1027     event.m_data.pos = newSashPosition;
1028
1029     if ( !DoSendEvent(event) )
1030     {
1031         // the event handler vetoed the change
1032         newSashPosition = -1;
1033     }
1034     else
1035     {
1036         // it could have been changed by it
1037         newSashPosition = event.GetSashPosition();
1038     }
1039
1040     return newSashPosition;
1041 }
1042
1043 // Called when the sash is double-clicked. The default behaviour is to remove
1044 // the sash if the minimum pane size is zero.
1045 void wxSplitterWindow::OnDoubleClickSash(int x, int y)
1046 {
1047     // new code should handle events instead of using the virtual functions
1048     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED, this);
1049     event.m_data.pt.x = x;
1050     event.m_data.pt.y = y;
1051     if ( DoSendEvent(event) )
1052     {
1053         if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
1054         {
1055             Unsplit();
1056         }
1057     }
1058     //else: blocked by user
1059 }
1060
1061 void wxSplitterWindow::OnUnsplit(wxWindow *winRemoved)
1062 {
1063     // do it before calling the event handler which may delete the window
1064     winRemoved->Show(FALSE);
1065
1066     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
1067     event.m_data.win = winRemoved;
1068
1069     (void)DoSendEvent(event);
1070 }
1071
1072 #ifdef __WXMSW__
1073
1074 // this is currently called (and needed) under MSW only...
1075 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& event)
1076 {
1077     // if we don't do it, the resizing cursor might be set for child window:
1078     // and like this we explicitly say that our cursor should not be used for
1079     // children windows which overlap us
1080
1081     if ( SashHitTest(event.GetX(), event.GetY()) )
1082     {
1083         // default processing is ok
1084         event.Skip();
1085     }
1086     //else: do nothing, in particular, don't call Skip()
1087 }
1088
1089 #endif // wxMSW
1090