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
  36 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  37 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxCommandEvent)
  38
  39 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  40     EVT_PAINT(wxSplitterWindow::OnPaint)
  41     EVT_SIZE(wxSplitterWindow::OnSize)
  42     EVT_IDLE(wxSplitterWindow::OnIdle)
  43     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  44
  45     EVT_SET_CURSOR(wxSplitterWindow::OnSetCursor)
  46
  47     EVT_SPLITTER_SASH_POS_CHANGED(-1, wxSplitterWindow::OnSashPosChanged)
  48     // NB: we borrow OnSashPosChanged for purposes of
  49     // EVT_SPLITTER_SASH_POS_CHANGING since default implementation is identical
  50     EVT_SPLITTER_SASH_POS_CHANGING(-1, wxSplitterWindow::OnSashPosChanged)
  51     EVT_SPLITTER_DCLICK(-1,           wxSplitterWindow::OnDoubleClick)
  52     EVT_SPLITTER_UNSPLIT(-1,          wxSplitterWindow::OnUnsplitEvent)
  53 END_EVENT_TABLE()
  54
  55 wxSplitterWindow::wxSplitterWindow()
  56 {
  57     m_splitMode = wxSPLIT_VERTICAL;
  58     m_permitUnsplitAlways = FALSE;
  59     m_windowOne = (wxWindow *) NULL;
  60     m_windowTwo = (wxWindow *) NULL;
  61     m_dragMode = wxSPLIT_DRAG_NONE;
  62     m_oldX = 0;
  63     m_oldY = 0;
  64     m_firstX = 0;
  65     m_firstY = 0;
  66     m_sashSize = 7;
  67     m_borderSize = 2;
  68     m_sashPosition = 0;
  69     m_sashCursorWE = (wxCursor *) NULL;
  70     m_sashCursorNS = (wxCursor *) NULL;
  71     m_sashTrackerPen = (wxPen *) NULL;
  72     m_lightShadowPen = (wxPen *) NULL;
  73     m_mediumShadowPen = (wxPen *) NULL;
  74     m_darkShadowPen = (wxPen *) NULL;
  75     m_faceBrush = (wxBrush *) NULL;
  76     m_facePen = (wxPen *) NULL;
  77     m_hilightPen = (wxPen *) NULL;
  78     m_minimumPaneSize = 0;
  79     m_needUpdating = FALSE;
  80 }
  81
  82 wxSplitterWindow::wxSplitterWindow(wxWindow *parent, wxWindowID id,
  83                                    const wxPoint& pos,
  84                                    const wxSize& size,
  85                                    long style,
  86                                    const wxString& name)
  87                 : wxWindow(parent, id, pos, size, style, name)
  88 {
  89     m_splitMode = wxSPLIT_VERTICAL;
  90     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  91     m_windowOne = (wxWindow *) NULL;
  92     m_windowTwo = (wxWindow *) NULL;
  93     m_dragMode = wxSPLIT_DRAG_NONE;
  94     m_oldX = 0;
  95     m_oldY = 0;
  96     m_firstX = 0;
  97     m_firstY = 0;
  98     m_sashSize = 7;
  99     m_borderSize = 2;
 100     m_sashPosition = 0;
 101     m_minimumPaneSize = 0;
 102     m_sashCursorWE = new wxCursor(wxCURSOR_SIZEWE);
 103     m_sashCursorNS = new wxCursor(wxCURSOR_SIZENS);
 104     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
 105     m_lightShadowPen = (wxPen *) NULL;
 106     m_mediumShadowPen = (wxPen *) NULL;
 107     m_darkShadowPen = (wxPen *) NULL;
 108     m_faceBrush = (wxBrush *) NULL;
 109     m_facePen = (wxPen *) NULL;
 110     m_hilightPen = (wxPen *) NULL;
 111
 112     if ( style & wxSP_3D )
 113     {
 114         m_borderSize = 2;
 115         m_sashSize = 7;
 116     }
 117     else if ( style & wxSP_BORDER )
 118     {
 119         m_borderSize = 1;
 120         m_sashSize = 3;
 121     }
 122     else
 123     {
 124         m_borderSize = 0;
 125         m_sashSize = 3;
 126     }
 127
 128     // Eventually, we'll respond to colour change messages
 129     InitColours();
 130
 131     // For debugging purposes, to see the background.
 132 //    SetBackground(wxBLUE_BRUSH);
 133
 134     m_needUpdating = FALSE;
 135 }
 136
 137 wxSplitterWindow::~wxSplitterWindow()
 138 {
 139     delete m_sashCursorWE;
 140     delete m_sashCursorNS;
 141     delete m_sashTrackerPen;
 142     delete m_lightShadowPen;
 143     delete m_darkShadowPen;
 144     delete m_mediumShadowPen;
 145     delete m_hilightPen;
 146     delete m_facePen;
 147     delete m_faceBrush;
 148 }
 149
 150 void wxSplitterWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 151 {
 152     wxPaintDC dc(this);
 153
 154     if ( m_borderSize > 0 )
 155         DrawBorders(dc);
 156     DrawSash(dc);
 157 }
 158
 159 void wxSplitterWindow::OnIdle(wxIdleEvent& WXUNUSED(event))
 160 {
 161     if (m_needUpdating)
 162         SizeWindows();
 163 }
 164
 165 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 166 {
 167     wxCoord x = (wxCoord)event.GetX(),
 168             y = (wxCoord)event.GetY();
 169
 170     // reset the cursor
 171 #ifdef __WXMOTIF__
 172     SetCursor(* wxSTANDARD_CURSOR);
 173 #endif
 174 #ifdef __WXMSW__
 175     SetCursor(wxCursor());
 176 #endif
 177
 178
 179     if (event.LeftDown())
 180     {
 181         if ( SashHitTest(x, y) )
 182         {
 183             CaptureMouse();
 184
 185             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 186
 187             if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 188             {
 189                 DrawSashTracker(x, y);
 190             }
 191
 192             m_oldX = x;
 193             m_oldY = y;
 194
 195             if ( m_splitMode == wxSPLIT_VERTICAL )
 196             {
 197                 SetCursor(*m_sashCursorWE);
 198             }
 199             else
 200             {
 201                 SetCursor(*m_sashCursorNS);
 202             }
 203             return;
 204         }
 205     }
 206     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 207     {
 208         // We can stop dragging now and see what we've got.
 209         m_dragMode = wxSPLIT_DRAG_NONE;
 210         ReleaseMouse();
 211
 212         // Erase old tracker
 213         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 214         {
 215             DrawSashTracker(m_oldX, m_oldY);
 216         }
 217
 218         // Obtain window size. We are only interested in the dimension the sash
 219         // splits up
 220         int w, h;
 221         GetClientSize(&w, &h);
 222         int window_size = (m_splitMode == wxSPLIT_VERTICAL ? w : h );
 223         int new_sash_position =
 224             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 225
 226         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED,
 227                                       this);
 228         eventSplitter.m_data.pos = new_sash_position;
 229         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 230         {
 231             new_sash_position = eventSplitter.GetSashPosition();
 232             if ( new_sash_position == -1 )
 233             {
 234                 // change not allowed
 235                 return;
 236             }
 237         }
 238
 239         if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 240         {
 241             // Deal with possible unsplit scenarios
 242             if ( new_sash_position == 0 )
 243             {
 244                 // We remove the first window from the view
 245                 wxWindow *removedWindow = m_windowOne;
 246                 m_windowOne = m_windowTwo;
 247                 m_windowTwo = (wxWindow *) NULL;
 248                 SendUnsplitEvent(removedWindow);
 249                 m_sashPosition = 0;
 250             }
 251             else if ( new_sash_position == window_size )
 252             {
 253                 // We remove the second window from the view
 254                 wxWindow *removedWindow = m_windowTwo;
 255                 m_windowTwo = (wxWindow *) NULL;
 256                 SendUnsplitEvent(removedWindow);
 257                 m_sashPosition = 0;
 258             }
 259             else
 260             {
 261                 m_sashPosition = new_sash_position;
 262             }
 263         }
 264         else
 265         {
 266             m_sashPosition = new_sash_position;
 267         }
 268
 269         SizeWindows();
 270         m_needUpdating = FALSE;
 271     }  // left up && dragging
 272     else if (event.Moving() && !event.Dragging())
 273     {
 274         // Just change the cursor if required
 275         if ( SashHitTest(x, y) )
 276         {
 277                 if ( m_splitMode == wxSPLIT_VERTICAL )
 278                 {
 279                     SetCursor(*m_sashCursorWE);
 280                 }
 281                 else
 282                 {
 283                     SetCursor(*m_sashCursorNS);
 284                 }
 285         }
 286 #if defined(__WXGTK__) || defined(__WXMSW__)
 287         else
 288         {
 289             // We must set the normal cursor in MSW, because
 290             // if the child window doesn't have a cursor, the
 291             // parent's (splitter window) will be used, and this
 292             // must be the standard cursor.
 293             wxLogDebug("wxSplitterWindow: Setting to standard cursor");
 294
 295             // where else do we unset the cursor?
 296             SetCursor(* wxSTANDARD_CURSOR);
 297         }
 298 #endif // __WXGTK__
 299
 300         m_needUpdating = FALSE;
 301     }
 302     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 303     {
 304 #ifdef __WXMSW__
 305         // Otherwise, the cursor sometimes reverts to the normal cursor
 306         // during dragging.
 307         if ( m_splitMode == wxSPLIT_VERTICAL )
 308         {
 309             SetCursor(*m_sashCursorWE);
 310         }
 311         else
 312         {
 313             SetCursor(*m_sashCursorNS);
 314         }
 315 #endif
 316
 317         // Obtain window size. We are only interested in the dimension the sash
 318         // splits up
 319         int new_sash_position =
 320             (int) ( m_splitMode == wxSPLIT_VERTICAL ? x : y );
 321
 322         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING,
 323                                       this);
 324         eventSplitter.m_data.pos = new_sash_position;
 325         if ( GetEventHandler()->ProcessEvent(eventSplitter) )
 326         {
 327             new_sash_position = eventSplitter.GetSashPosition();
 328             if ( new_sash_position == -1 )
 329             {
 330                 // change not allowed
 331                 return;
 332             }
 333         }
 334
 335         // Erase old tracker
 336         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 337         {
 338             DrawSashTracker(m_oldX, m_oldY);
 339         }
 340
 341         if (m_splitMode == wxSPLIT_VERTICAL)
 342             x = new_sash_position;
 343         else
 344             y = new_sash_position;
 345
 346         if (new_sash_position != -1)
 347         {
 348             // Only modify if permitted
 349             m_oldX = x;
 350             m_oldY = y;
 351         }
 352
 353 #ifdef __WXMSW__
 354         // As we captured the mouse, we may get the mouse events from outside
 355         // our window - for example, negative values in x, y. This has a weird
 356         // consequence under MSW where we use unsigned values sometimes and
 357         // signed ones other times: the coordinates turn as big positive
 358         // numbers and so the sash is drawn on the *right* side of the window
 359         // instead of the left (or bottom instead of top). Correct this.
 360         if ( (short)m_oldX < 0 )
 361             m_oldX = 0;
 362         if ( (short)m_oldY < 0 )
 363             m_oldY = 0;
 364 #endif // __WXMSW__
 365
 366         // Draw new one
 367         if ((GetWindowStyleFlag() & wxSP_LIVE_UPDATE) == 0)
 368         {
 369             DrawSashTracker(m_oldX, m_oldY);
 370         }
 371         else
 372         {
 373             m_sashPosition = new_sash_position;
 374             m_needUpdating = TRUE;
 375         }
 376     }
 377     else if ( event.LeftDClick() )
 378     {
 379         wxSplitterEvent eventSplitter(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,
 380                                       this);
 381         eventSplitter.m_data.pt.x = x;
 382         eventSplitter.m_data.pt.y = y;
 383
 384         (void)GetEventHandler()->ProcessEvent(eventSplitter);
 385     }
 386 }
 387
 388 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 389 {
 390     // only process this message if we're not iconized - otherwise iconizing
 391     // and restoring a window containing the splitter has a funny side effect
 392     // of changing the splitter position!
 393     wxWindow *parent = GetParent();
 394     while ( parent && !parent->IsTopLevel() )
 395     {
 396         parent = parent->GetParent();
 397     }
 398
 399     bool iconized = FALSE;
 400     wxFrame *frame = wxDynamicCast(parent, wxFrame);
 401     if ( frame )
 402         iconized = frame->IsIconized();
 403     else
 404     {
 405         wxDialog *dialog = wxDynamicCast(parent, wxDialog);
 406         if ( dialog )
 407             iconized = dialog->IsIconized();
 408         else
 409             wxFAIL_MSG(wxT("should have a top level frame or dialog parent!"));
 410     }
 411
 412     if ( iconized )
 413     {
 414         event.Skip();
 415     }
 416     else
 417     {
 418         int cw, ch;
 419         GetClientSize( &cw, &ch );
 420         if ( m_windowTwo )
 421         {
 422             if ( m_splitMode == wxSPLIT_VERTICAL )
 423             {
 424                 if ( m_sashPosition >= (cw - 5) )
 425                     m_sashPosition = wxMax(10, cw - 40);
 426             }
 427             if ( m_splitMode == wxSPLIT_HORIZONTAL )
 428             {
 429                 if ( m_sashPosition >= (ch - 5) )
 430                     m_sashPosition = wxMax(10, ch - 40);
 431             }
 432         }
 433
 434         SizeWindows();
 435     }
 436 }
 437
 438 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 439 {
 440     if ( m_windowTwo == NULL || m_sashPosition == 0)
 441         return FALSE; // No sash
 442
 443     if ( m_splitMode == wxSPLIT_VERTICAL )
 444     {
 445         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 446             return TRUE;
 447         else
 448             return FALSE;
 449     }
 450     else
 451     {
 452         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 453             return TRUE;
 454         else
 455             return FALSE;
 456     }
 457 }
 458
 459 // Draw 3D effect borders
 460 void wxSplitterWindow::DrawBorders(wxDC& dc)
 461 {
 462     int w, h;
 463     GetClientSize(&w, &h);
 464
 465     if ( GetWindowStyleFlag() & wxSP_3D )
 466     {
 467
 468         dc.SetPen(*m_facePen);
 469         dc.SetBrush(*m_faceBrush);
 470         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 471         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 472         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 473         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 474
 475         dc.SetPen(*m_mediumShadowPen);
 476         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 477         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 478
 479         dc.SetPen(*m_darkShadowPen);
 480         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 481         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 482
 483         dc.SetPen(*m_hilightPen);
 484         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 485         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.
 486                                      /// Anyway, h is required for MSW.
 487
 488         dc.SetPen(*m_lightShadowPen);
 489         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 490         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 491     }
 492     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 493     {
 494         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 495         dc.SetPen(*wxBLACK_PEN);
 496         dc.DrawRectangle(0, 0, w-1, h-1);
 497     }
 498
 499     dc.SetPen(wxNullPen);
 500     dc.SetBrush(wxNullBrush);
 501 }
 502
 503 // Draw the sash
 504 void wxSplitterWindow::DrawSash(wxDC& dc)
 505 {
 506     if ( m_sashPosition == 0 || !m_windowTwo)
 507         return;
 508
 509     int w, h;
 510     GetClientSize(&w, &h);
 511
 512     if ( GetWindowStyleFlag() & wxSP_3D )
 513     {
 514         if ( m_splitMode == wxSPLIT_VERTICAL )
 515         {
 516             dc.SetPen(*m_facePen);
 517             dc.SetBrush(*m_faceBrush);
 518             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 519
 520             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 521
 522             dc.SetPen(*m_lightShadowPen);
 523                         int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 524             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 525
 526             dc.SetPen(*m_hilightPen);
 527             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 528
 529             dc.SetPen(*m_mediumShadowPen);
 530                         int yMedium = m_borderSize ? h-m_borderSize+1 : h ;
 531             dc.DrawLine(m_sashPosition+m_sashSize-2, xShadow, m_sashPosition+m_sashSize-2, yMedium);
 532
 533             dc.SetPen(*m_darkShadowPen);
 534             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 535         }
 536         else
 537         {
 538             dc.SetPen(*m_facePen);
 539             dc.SetBrush(*m_faceBrush);
 540             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 541
 542             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 543
 544             dc.SetPen(*m_lightShadowPen);
 545             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 546
 547             dc.SetPen(*m_hilightPen);
 548             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 549
 550             dc.SetPen(*m_mediumShadowPen);
 551             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 552
 553             dc.SetPen(*m_darkShadowPen);
 554             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 555         }
 556     }
 557     else
 558     {
 559         if ( m_splitMode == wxSPLIT_VERTICAL )
 560         {
 561             dc.SetPen(*wxBLACK_PEN);
 562             dc.SetBrush(*wxBLACK_BRUSH);
 563             int h1 = h-1;
 564             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 565                 h1 += 1; // Not sure why this is necessary...
 566             dc.DrawRectangle(m_sashPosition, 0, m_sashSize, h1);
 567         }
 568         else
 569         {
 570             dc.SetPen(*wxBLACK_PEN);
 571             dc.SetBrush(*wxBLACK_BRUSH);
 572             int w1 = w-1;
 573             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER )
 574                 w1 ++;
 575
 576             dc.DrawRectangle(0, m_sashPosition, w1, m_sashSize);
 577         }
 578
 579     }
 580
 581     dc.SetPen(wxNullPen);
 582     dc.SetBrush(wxNullBrush);
 583 }
 584
 585 // Draw the sash tracker (for whilst moving the sash)
 586 void wxSplitterWindow::DrawSashTracker(int x, int y)
 587 {
 588     int w, h;
 589     GetClientSize(&w, &h);
 590
 591     wxScreenDC screenDC;
 592     int x1, y1;
 593     int x2, y2;
 594
 595     if ( m_splitMode == wxSPLIT_VERTICAL )
 596     {
 597         x1 = x; y1 = 2;
 598         x2 = x; y2 = h-2;
 599
 600         if ( x1 > w )
 601         {
 602             x1 = w; x2 = w;
 603         }
 604         else if ( x1 < 0 )
 605         {
 606             x1 = 0; x2 = 0;
 607         }
 608     }
 609     else
 610     {
 611         x1 = 2; y1 = y;
 612         x2 = w-2; y2 = y;
 613
 614         if ( y1 > h )
 615         {
 616             y1 = h;
 617             y2 = h;
 618         }
 619         else if ( y1 < 0 )
 620         {
 621             y1 = 0;
 622             y2 = 0;
 623         }
 624     }
 625
 626     ClientToScreen(&x1, &y1);
 627     ClientToScreen(&x2, &y2);
 628
 629     screenDC.SetLogicalFunction(wxINVERT);
 630     screenDC.SetPen(*m_sashTrackerPen);
 631     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 632
 633     screenDC.DrawLine(x1, y1, x2, y2);
 634
 635     screenDC.SetLogicalFunction(wxCOPY);
 636
 637     screenDC.SetPen(wxNullPen);
 638     screenDC.SetBrush(wxNullBrush);
 639 }
 640
 641 // Position and size subwindows.
 642 // Note that the border size applies to each subwindow, not
 643 // including the edges next to the sash.
 644 void wxSplitterWindow::SizeWindows()
 645 {
 646     int w, h;
 647     GetClientSize(&w, &h);
 648
 649     if ( m_windowOne && !m_windowTwo )
 650     {
 651         m_windowOne->SetSize(m_borderSize, m_borderSize, w - 2*m_borderSize, h - 2*m_borderSize);
 652
 653     }
 654     else if ( m_windowOne && m_windowTwo )
 655     {
 656         if (m_splitMode == wxSPLIT_VERTICAL)
 657         {
 658             int x1 = m_borderSize;
 659             int y1 = m_borderSize;
 660             int w1 = m_sashPosition - m_borderSize;
 661             int h1 = h - 2*m_borderSize;
 662
 663             int x2 = m_sashPosition + m_sashSize;
 664             int y2 = m_borderSize;
 665             int w2 = w - 2*m_borderSize - m_sashSize - w1;
 666             int h2 = h - 2*m_borderSize;
 667
 668             m_windowOne->SetSize(x1, y1, w1, h1);
 669             m_windowTwo->SetSize(x2, y2, w2, h2);
 670
 671         }
 672         else
 673         {
 674             m_windowOne->SetSize(m_borderSize, m_borderSize,
 675                 w - 2*m_borderSize, m_sashPosition - m_borderSize);
 676             m_windowTwo->SetSize(m_borderSize, m_sashPosition + m_sashSize,
 677                 w - 2*m_borderSize, h - 2*m_borderSize - m_sashSize - (m_sashPosition - m_borderSize));
 678
 679         }
 680     }
 681     wxClientDC dc(this);
 682     if ( m_borderSize > 0 )
 683         DrawBorders(dc);
 684     DrawSash(dc);
 685 }
 686
 687 // Set pane for unsplit window
 688 void wxSplitterWindow::Initialize(wxWindow *window)
 689 {
 690     m_windowOne = window;
 691     m_windowTwo = (wxWindow *) NULL;
 692     m_sashPosition = 0;
 693 }
 694
 695 // Associates the given window with window 2, drawing the appropriate sash
 696 // and changing the split mode.
 697 // Does nothing and returns FALSE if the window is already split.
 698 bool wxSplitterWindow::SplitVertically(wxWindow *window1, wxWindow *window2, int sashPosition)
 699 {
 700     if ( IsSplit() )
 701         return FALSE;
 702
 703     int w, h;
 704     GetClientSize(&w, &h);
 705
 706     m_splitMode = wxSPLIT_VERTICAL;
 707     m_windowOne = window1;
 708     m_windowTwo = window2;
 709     if ( sashPosition > 0 )
 710         m_sashPosition = sashPosition;
 711     else if ( sashPosition < 0 )
 712         m_sashPosition = w - sashPosition;
 713     else    // default
 714         m_sashPosition = w/2;
 715
 716     SizeWindows();
 717
 718     return TRUE;
 719 }
 720
 721 bool wxSplitterWindow::SplitHorizontally(wxWindow *window1, wxWindow *window2, int sashPosition)
 722 {
 723     if ( IsSplit() )
 724         return FALSE;
 725
 726     int w, h;
 727     GetClientSize(&w, &h);
 728
 729     m_splitMode = wxSPLIT_HORIZONTAL;
 730     m_windowOne = window1;
 731     m_windowTwo = window2;
 732     if ( sashPosition > 0 )
 733         m_sashPosition = sashPosition;
 734     else if ( sashPosition < 0 )
 735         m_sashPosition = h - sashPosition;
 736     else    // default
 737         m_sashPosition = h/2;
 738
 739     SizeWindows();
 740
 741     return TRUE;
 742 }
 743
 744
 745 // Remove the specified (or second) window from the view
 746 // Doesn't actually delete the window.
 747 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 748 {
 749     if ( ! IsSplit() )
 750         return FALSE;
 751
 752     wxWindow *win = NULL;
 753     if ( toRemove == NULL || toRemove == m_windowTwo)
 754     {
 755         win = m_windowTwo ;
 756         m_windowTwo = (wxWindow *) NULL;
 757     }
 758     else if ( toRemove == m_windowOne )
 759     {
 760         win = m_windowOne ;
 761         m_windowOne = m_windowTwo;
 762         m_windowTwo = (wxWindow *) NULL;
 763     }
 764     else
 765     {
 766         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 767
 768         return FALSE;
 769     }
 770
 771     SendUnsplitEvent(win);
 772     m_sashPosition = 0;
 773     SizeWindows();
 774
 775     return TRUE;
 776 }
 777
 778 // Replace a window with another one
 779 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 780 {
 781     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 782     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 783
 784     if ( winOld == m_windowTwo )
 785     {
 786         m_windowTwo = winNew;
 787     }
 788     else if ( winOld == m_windowOne )
 789     {
 790         m_windowOne = winNew;
 791     }
 792     else
 793     {
 794         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 795
 796         return FALSE;
 797     }
 798
 799     SizeWindows();
 800
 801     return TRUE;
 802 }
 803
 804 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 805 {
 806     m_sashPosition = position;
 807
 808     if ( redraw )
 809     {
 810         SizeWindows();
 811     }
 812 }
 813
 814 // Initialize colours
 815 void wxSplitterWindow::InitColours()
 816 {
 817     wxDELETE( m_facePen );
 818     wxDELETE( m_faceBrush );
 819     wxDELETE( m_mediumShadowPen );
 820     wxDELETE( m_darkShadowPen );
 821     wxDELETE( m_lightShadowPen );
 822     wxDELETE( m_hilightPen );
 823
 824     // Shadow colours
 825 #if defined(__WIN95__)
 826     wxColour faceColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 827     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 828     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 829
 830     wxColour mediumShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW));
 831     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 832
 833     wxColour darkShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW));
 834     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 835
 836     wxColour lightShadowColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT));
 837     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 838
 839     wxColour hilightColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT));
 840     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 841 #else // !Win32
 842     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 843     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 844     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 845     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 846     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 847     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 848 #endif // Win32/!Win32
 849 }
 850
 851 void wxSplitterWindow::SendUnsplitEvent(wxWindow *winRemoved)
 852 {
 853     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 854     event.m_data.win = winRemoved;
 855
 856     (void)GetEventHandler()->ProcessEvent(event);
 857 }
 858
 859 // ---------------------------------------------------------------------------
 860 // splitter event handlers
 861 // ---------------------------------------------------------------------------
 862
 863 void wxSplitterWindow::OnSashPosChanged(wxSplitterEvent& event)
 864 {
 865     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 866     const int UNSPLIT_THRESHOLD = 4;
 867
 868     int newSashPosition = event.GetSashPosition();
 869
 870     // Obtain relevant window dimension for bottom / right threshold check
 871     int w, h;
 872     GetClientSize(&w, &h);
 873     int window_size = (m_splitMode == wxSPLIT_VERTICAL) ? w : h ;
 874
 875     bool unsplit_scenario = FALSE;
 876     if ( m_permitUnsplitAlways
 877             || m_minimumPaneSize == 0 )
 878     {
 879         // Do edge detection if unsplit premitted
 880         if ( newSashPosition <= UNSPLIT_THRESHOLD )
 881         {
 882             // threshold top / left check
 883             newSashPosition = 0;
 884             unsplit_scenario = TRUE;
 885         }
 886         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
 887         {
 888             // threshold bottom/right check
 889             newSashPosition = window_size;
 890             unsplit_scenario = TRUE;
 891         }
 892     }
 893
 894     if ( !unsplit_scenario )
 895     {
 896         // If resultant pane would be too small, enlarge it
 897         if ( newSashPosition < m_minimumPaneSize )
 898             newSashPosition = m_minimumPaneSize;
 899         if ( newSashPosition > window_size - m_minimumPaneSize )
 900             newSashPosition = window_size - m_minimumPaneSize;
 901     }
 902
 903     // If the result is out of bounds it means minimum size is too big,
 904     // so split window in half as best compromise.
 905     if ( newSashPosition < 0 || newSashPosition > window_size )
 906         newSashPosition = window_size / 2;
 907
 908     // for compatibility, call the virtual function
 909     if ( !OnSashPositionChange(newSashPosition) )
 910     {
 911         newSashPosition = -1;
 912     }
 913
 914     event.SetSashPosition(newSashPosition);
 915 }
 916
 917 // Called when the sash is double-clicked. The default behaviour is to remove
 918 // the sash if the minimum pane size is zero.
 919 void wxSplitterWindow::OnDoubleClick(wxSplitterEvent& event)
 920 {
 921     // for compatibility, call the virtual function
 922     OnDoubleClickSash(event.GetX(), event.GetY());
 923
 924     if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
 925     {
 926         Unsplit();
 927     }
 928 }
 929
 930 void wxSplitterWindow::OnUnsplitEvent(wxSplitterEvent& event)
 931 {
 932     wxWindow *win = event.GetWindowBeingRemoved();
 933
 934     // do it before calling OnUnsplit() which may delete the window
 935     win->Show(FALSE);
 936
 937     // for compatibility, call the virtual function
 938     OnUnsplit(win);
 939 }
 940
 941 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& event)
 942 {
 943     // this is currently called (and needed) under MSW only...
 944 #ifdef __WXMSW__
 945
 946     // if we don't do it, the resizing cursor might be set for child window:
 947     // and like this we explicitly say that our cursor should not be used for
 948     // children windows which overlap us
 949
 950     if ( SashHitTest(event.GetX(), event.GetY()) )
 951     {
 952         // default processing is ok
 953         event.Skip();
 954     }
 955     //else: do nothing, in particular, don't call Skip()
 956 #endif // wxMSW
 957 }