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 #if wxUSE_SPLITTER
  20 #ifdef __BORLANDC__
  21     #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/string.h"
  26     #include "wx/utils.h"
  27     #include "wx/log.h"
  28
  29     #include "wx/dcscreen.h"
  30
  31     #include "wx/window.h"
  32     #include "wx/dialog.h"
  33     #include "wx/frame.h"
  34
  35     #include "wx/settings.h"
  36 #endif
  37
  38 #include "wx/splitter.h"
  39
  40 #include <stdlib.h>
  41
  42 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED)
  43 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING)
  44 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED)
  45 DEFINE_EVENT_TYPE(wxEVT_COMMAND_SPLITTER_UNSPLIT)
  46
  47 IMPLEMENT_DYNAMIC_CLASS(wxSplitterWindow, wxWindow)
  48 IMPLEMENT_DYNAMIC_CLASS(wxSplitterEvent, wxNotifyEvent)
  49
  50 BEGIN_EVENT_TABLE(wxSplitterWindow, wxWindow)
  51     EVT_PAINT(wxSplitterWindow::OnPaint)
  52     EVT_SIZE(wxSplitterWindow::OnSize)
  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::OnInternalIdle()
 159 {
 160     wxWindow::OnInternalIdle();
 161
 162     if (m_needUpdating)
 163         SizeWindows();
 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                 wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 256                 event.m_data.win = removedWindow;
 257                 (void)DoSendEvent(event);
 258                 SetSashPositionAndNotify(0);
 259             }
 260             else if ( posSashNew == GetWindowSize() )
 261             {
 262                 // We remove the second window from the view
 263                 wxWindow *removedWindow = m_windowTwo;
 264                 m_windowTwo = (wxWindow *) NULL;
 265                 OnUnsplit(removedWindow);
 266                 wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 267                 event.m_data.win = removedWindow;
 268                 (void)DoSendEvent(event);
 269                 SetSashPositionAndNotify(0);
 270             }
 271             else
 272             {
 273                 SetSashPositionAndNotify(posSashNew);
 274             }
 275         }
 276         else
 277         {
 278             SetSashPositionAndNotify(posSashNew);
 279         }
 280
 281         SizeWindows();
 282     }  // left up && dragging
 283     else if ((event.Moving() || event.Leaving() || event.Entering()) && (m_dragMode == wxSPLIT_DRAG_NONE))
 284     {
 285         // Just change the cursor as required
 286         if ( !event.Leaving() && SashHitTest(x, y) )
 287         {
 288             SetResizeCursor();
 289         }
 290         else
 291         {
 292             SetCursor(* wxSTANDARD_CURSOR);
 293         }
 294     }
 295     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 296     {
 297         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 298         if ( !diff )
 299         {
 300             // nothing to do, mouse didn't really move far enough
 301             return;
 302         }
 303
 304         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 305         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 306         if ( posSashNew == -1 )
 307         {
 308             // change not allowed
 309             return;
 310         }
 311
 312         if ( posSashNew == m_sashPosition )
 313             return;
 314
 315         // Erase old tracker
 316         if ( !isLive )
 317         {
 318             DrawSashTracker(m_oldX, m_oldY);
 319         }
 320
 321         if (m_splitMode == wxSPLIT_VERTICAL)
 322             x = posSashNew;
 323         else
 324             y = posSashNew;
 325
 326         // Remember old positions
 327         m_oldX = x;
 328         m_oldY = y;
 329
 330 #ifdef __WXMSW__
 331         // As we captured the mouse, we may get the mouse events from outside
 332         // our window - for example, negative values in x, y. This has a weird
 333         // consequence under MSW where we use unsigned values sometimes and
 334         // signed ones other times: the coordinates turn as big positive
 335         // numbers and so the sash is drawn on the *right* side of the window
 336         // instead of the left (or bottom instead of top). Correct this.
 337         if ( (short)m_oldX < 0 )
 338             m_oldX = 0;
 339         if ( (short)m_oldY < 0 )
 340             m_oldY = 0;
 341 #endif // __WXMSW__
 342
 343         // Draw new one
 344         if ( !isLive )
 345         {
 346             m_sashPositionCurrent = posSashNew;
 347
 348             DrawSashTracker(m_oldX, m_oldY);
 349         }
 350         else
 351         {
 352             SetSashPositionAndNotify(posSashNew);
 353             m_needUpdating = TRUE;
 354         }
 355     }
 356     else if ( event.LeftDClick() && m_windowTwo )
 357     {
 358         OnDoubleClickSash(x, y);
 359     }
 360 }
 361
 362 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 363 {
 364     // only process this message if we're not iconized - otherwise iconizing
 365     // and restoring a window containing the splitter has a funny side effect
 366     // of changing the splitter position!
 367     wxWindow *parent = GetParent();
 368     while ( parent && !parent->IsTopLevel() )
 369     {
 370         parent = parent->GetParent();
 371     }
 372
 373     bool iconized = FALSE;
 374
 375     // wxMotif doesn't yet have a wxTopLevelWindow implementation
 376 #ifdef __WXMOTIF__
 377     wxFrame *winTop = wxDynamicCast(parent, wxFrame);
 378 #else
 379     wxTopLevelWindow *winTop = wxDynamicCast(parent, wxTopLevelWindow);
 380 #endif
 381     if ( winTop )
 382     {
 383         iconized = winTop->IsIconized();
 384     }
 385 #ifndef __WXMOTIF__
 386     else
 387     {
 388         wxFAIL_MSG(wxT("should have a top level parent!"));
 389
 390         iconized = FALSE;
 391     }
 392 #endif
 393
 394     if ( iconized )
 395     {
 396         event.Skip();
 397
 398         return;
 399     }
 400
 401     int cw, ch;
 402     GetClientSize( &cw, &ch );
 403     if ( m_windowTwo )
 404     {
 405         if ( m_splitMode == wxSPLIT_VERTICAL )
 406         {
 407             if ( m_sashPosition >= (cw - 5) )
 408                 SetSashPositionAndNotify(wxMax(10, cw - 40));
 409         }
 410         else // m_splitMode == wxSPLIT_HORIZONTAL
 411         {
 412             if ( m_sashPosition >= (ch - 5) )
 413                 SetSashPositionAndNotify(wxMax(10, ch - 40));
 414         }
 415     }
 416
 417     SizeWindows();
 418 }
 419
 420 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 421 {
 422     if ( m_windowTwo == NULL || m_sashPosition == 0)
 423         return FALSE; // No sash
 424
 425     if ( m_splitMode == wxSPLIT_VERTICAL )
 426     {
 427         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 428             return TRUE;
 429         else
 430             return FALSE;
 431     }
 432     else
 433     {
 434         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 435             return TRUE;
 436         else
 437             return FALSE;
 438     }
 439 }
 440
 441 // Draw 3D effect borders
 442 void wxSplitterWindow::DrawBorders(wxDC& dc)
 443 {
 444     int w, h;
 445     GetClientSize(&w, &h);
 446
 447     if ( GetWindowStyleFlag() & wxSP_3DBORDER )
 448     {
 449
 450         dc.SetPen(*m_facePen);
 451         dc.SetBrush(*m_faceBrush);
 452         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 453         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 454         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 455         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 456
 457         dc.SetPen(*m_mediumShadowPen);
 458         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 459         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 460
 461         dc.SetPen(*m_darkShadowPen);
 462         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 463         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 464
 465         dc.SetPen(*m_hilightPen);
 466         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 467         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.
 468                                      /// Anyway, h is required for MSW.
 469
 470         dc.SetPen(*m_lightShadowPen);
 471         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 472         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 473     }
 474     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 475     {
 476         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 477         dc.SetPen(*wxBLACK_PEN);
 478         dc.DrawRectangle(0, 0, w-1, h-1);
 479     }
 480
 481     dc.SetPen(wxNullPen);
 482     dc.SetBrush(wxNullBrush);
 483 }
 484
 485 // Draw the sash
 486 void wxSplitterWindow::DrawSash(wxDC& dc)
 487 {
 488     if ( m_sashPosition == 0 || !m_windowTwo)
 489         return;
 490     if (GetWindowStyle() & wxSP_NOSASH)
 491         return;
 492
 493     int w, h;
 494     GetClientSize(&w, &h);
 495
 496     if ( GetWindowStyleFlag() & wxSP_3DSASH )
 497     {
 498         if ( m_splitMode == wxSPLIT_VERTICAL )
 499         {
 500             dc.SetPen(*m_facePen);
 501
 502             if (HasFlag( wxSP_SASH_AQUA ))
 503                 dc.SetBrush(*wxWHITE_BRUSH);
 504             else
 505                 dc.SetBrush(*m_faceBrush);
 506             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 507
 508             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 509
 510             dc.SetPen(*m_lightShadowPen);
 511             int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 512             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 513
 514             dc.SetPen(*m_hilightPen);
 515             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 516
 517             if (!HasFlag( wxSP_SASH_AQUA ))
 518                 dc.SetPen(*m_mediumShadowPen);
 519
 520             int yMedium = m_borderSize ? h-m_borderSize+1 : h ;
 521             dc.DrawLine(m_sashPosition+m_sashSize-2, xShadow, m_sashPosition+m_sashSize-2, yMedium);
 522
 523             if (HasFlag( wxSP_SASH_AQUA ))
 524                 dc.SetPen(*m_lightShadowPen);
 525             else
 526                 dc.SetPen(*m_darkShadowPen);
 527             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 528
 529             // Draw the top and bottom edges of the sash, if requested
 530             if (GetWindowStyle() & wxSP_FULLSASH)
 531             {
 532                 // Top
 533                 dc.SetPen(*m_hilightPen);
 534                 dc.DrawLine(m_sashPosition+1, m_borderSize, m_sashPosition+m_sashSize-1, m_borderSize);
 535
 536                 // Bottom
 537                 dc.SetPen(*m_darkShadowPen);
 538                 dc.DrawLine(m_sashPosition+1, h-m_borderSize-1, m_sashPosition+m_sashSize-1, h-m_borderSize-1);
 539             }
 540         }
 541         else // wxSPLIT_HORIZONTAL
 542         {
 543             dc.SetPen(*m_facePen);
 544             if (HasFlag( wxSP_SASH_AQUA ))
 545                 dc.SetBrush(*wxWHITE_BRUSH);
 546             else
 547                 dc.SetBrush(*m_faceBrush);
 548             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 549
 550             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 551
 552             dc.SetPen(*m_lightShadowPen);
 553             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 554
 555             dc.SetPen(*m_hilightPen);
 556             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 557
 558             if (!HasFlag( wxSP_SASH_AQUA ))
 559                 dc.SetPen(*m_mediumShadowPen);
 560             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 561
 562             if (HasFlag( wxSP_SASH_AQUA ))
 563                 dc.SetPen(*m_lightShadowPen);
 564             else
 565                 dc.SetPen(*m_darkShadowPen);
 566             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 567
 568             // Draw the left and right edges of the sash, if requested
 569             if (GetWindowStyle() & wxSP_FULLSASH)
 570             {
 571                 // Left
 572                 dc.SetPen(*m_hilightPen);
 573                 dc.DrawLine(m_borderSize, m_sashPosition, m_borderSize, m_sashPosition+m_sashSize);
 574
 575                 // Right
 576                 dc.SetPen(*m_darkShadowPen);
 577                 dc.DrawLine(w-m_borderSize-1, m_sashPosition+1, w-m_borderSize-1, m_sashPosition+m_sashSize-1);
 578             }
 579         }
 580     }
 581     else // !wxSP_3DSASH
 582     {
 583         dc.SetPen(*wxTRANSPARENT_PEN);
 584         dc.SetBrush(*m_faceBrush);
 585         if ( m_splitMode == wxSPLIT_VERTICAL )
 586         {
 587             int h1 = h-1;
 588             int y1 = 0;
 589             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 590                 h1 += 1; // Not sure why this is necessary...
 591             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 592             {
 593                 y1 = 2; h1 -= 3;
 594             }
 595             dc.DrawRectangle(m_sashPosition, y1, m_sashSize, h1);
 596         }
 597         else // wxSPLIT_HORIZONTAL
 598         {
 599             int w1 = w-1;
 600             int x1 = 0;
 601             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 602                 w1 ++;
 603             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 604             {
 605                 x1 = 2; w1 -= 3;
 606             }
 607             dc.DrawRectangle(x1, m_sashPosition, w1, m_sashSize);
 608         }
 609     }
 610
 611     dc.SetPen(wxNullPen);
 612     dc.SetBrush(wxNullBrush);
 613 }
 614
 615 // Draw the sash tracker (for whilst moving the sash)
 616 void wxSplitterWindow::DrawSashTracker(int x, int y)
 617 {
 618     int w, h;
 619     GetClientSize(&w, &h);
 620
 621     wxScreenDC screenDC;
 622     int x1, y1;
 623     int x2, y2;
 624
 625     if ( m_splitMode == wxSPLIT_VERTICAL )
 626     {
 627         x1 = x; y1 = 2;
 628         x2 = x; y2 = h-2;
 629
 630         if ( x1 > w )
 631         {
 632             x1 = w; x2 = w;
 633         }
 634         else if ( x1 < 0 )
 635         {
 636             x1 = 0; x2 = 0;
 637         }
 638     }
 639     else
 640     {
 641         x1 = 2; y1 = y;
 642         x2 = w-2; y2 = y;
 643
 644         if ( y1 > h )
 645         {
 646             y1 = h;
 647             y2 = h;
 648         }
 649         else if ( y1 < 0 )
 650         {
 651             y1 = 0;
 652             y2 = 0;
 653         }
 654     }
 655
 656     ClientToScreen(&x1, &y1);
 657     ClientToScreen(&x2, &y2);
 658
 659     screenDC.SetLogicalFunction(wxINVERT);
 660     screenDC.SetPen(*m_sashTrackerPen);
 661     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 662
 663     screenDC.DrawLine(x1, y1, x2, y2);
 664
 665     screenDC.SetLogicalFunction(wxCOPY);
 666
 667     screenDC.SetPen(wxNullPen);
 668     screenDC.SetBrush(wxNullBrush);
 669 }
 670
 671 int wxSplitterWindow::GetWindowSize() const
 672 {
 673     wxSize size = GetClientSize();
 674
 675     return m_splitMode == wxSPLIT_VERTICAL ? size.x : size.y;
 676 }
 677
 678 int wxSplitterWindow::AdjustSashPosition(int sashPos) const
 679 {
 680     int window_size = GetWindowSize();
 681
 682     wxWindow *win;
 683
 684     win = GetWindow1();
 685     if ( win )
 686     {
 687         // the window shouldn't be smaller than its own minimal size nor
 688         // smaller than the minimual pane size specified for this splitter
 689         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 690                                                       : win->GetMinHeight();
 691
 692         if ( minSize == -1 || m_minimumPaneSize > minSize )
 693             minSize = m_minimumPaneSize;
 694
 695         minSize += GetBorderSize();
 696
 697         if ( sashPos < minSize )
 698             sashPos = minSize;
 699     }
 700
 701     win = GetWindow2();
 702     if ( win )
 703     {
 704         int minSize = m_splitMode == wxSPLIT_VERTICAL ? win->GetMinWidth()
 705                                                       : win->GetMinHeight();
 706
 707         if ( minSize == -1 || m_minimumPaneSize > minSize )
 708             minSize = m_minimumPaneSize;
 709
 710         int maxSize = window_size - minSize - GetBorderSize();
 711         if ( sashPos > maxSize )
 712             sashPos = maxSize;
 713     }
 714
 715     return sashPos;
 716 }
 717
 718 bool wxSplitterWindow::DoSetSashPosition(int sashPos)
 719 {
 720     int newSashPosition = AdjustSashPosition(sashPos);
 721
 722     if ( newSashPosition == m_sashPosition )
 723         return FALSE;
 724
 725     m_sashPosition = newSashPosition;
 726
 727     return TRUE;
 728 }
 729
 730 void wxSplitterWindow::SetSashPositionAndNotify(int sashPos)
 731 {
 732     if ( DoSetSashPosition(sashPos) )
 733     {
 734         wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED, this);
 735         event.m_data.pos = m_sashPosition;
 736
 737         (void)DoSendEvent(event);
 738     }
 739 }
 740
 741 // Position and size subwindows.
 742 // Note that the border size applies to each subwindow, not
 743 // including the edges next to the sash.
 744 void wxSplitterWindow::SizeWindows()
 745 {
 746     // check if we have delayed setting the real sash position
 747     if ( m_requestedSashPosition != INT_MAX )
 748     {
 749         int newSashPosition = ConvertSashPosition(m_requestedSashPosition);
 750         if ( newSashPosition != m_sashPosition )
 751         {
 752             DoSetSashPosition(newSashPosition);
 753         }
 754
 755         if ( newSashPosition <= m_sashPosition
 756             && newSashPosition >= m_sashPosition - GetBorderSize() )
 757         {
 758             // don't update it any more
 759             m_requestedSashPosition = INT_MAX;
 760         }
 761     }
 762
 763     int w, h;
 764     GetClientSize(&w, &h);
 765
 766     if ( GetWindow1() && !GetWindow2() )
 767     {
 768         GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 769                               w - 2*GetBorderSize(), h - 2*GetBorderSize());
 770     }
 771     else if ( GetWindow1() && GetWindow2() )
 772     {
 773         if (GetSplitMode() == wxSPLIT_VERTICAL)
 774         {
 775             int x1 = GetBorderSize();
 776             int y1 = GetBorderSize();
 777             int w1 = GetSashPosition() - GetBorderSize();
 778             int h1 = h - 2*GetBorderSize();
 779
 780             int x2 = GetSashPosition() + GetSashSize();
 781             int y2 = GetBorderSize();
 782             int w2 = w - 2*GetBorderSize() - GetSashSize() - w1;
 783             int h2 = h - 2*GetBorderSize();
 784
 785             GetWindow1()->SetSize(x1, y1, w1, h1);
 786             GetWindow2()->SetSize(x2, y2, w2, h2);
 787         }
 788         else
 789         {
 790             GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 791                 w - 2*GetBorderSize(), GetSashPosition() - GetBorderSize());
 792             GetWindow2()->SetSize(GetBorderSize(), GetSashPosition() + GetSashSize(),
 793                 w - 2*GetBorderSize(), h - 2*GetBorderSize() - GetSashSize() - (GetSashPosition() - GetBorderSize()));
 794         }
 795     }
 796     wxClientDC dc(this);
 797     if ( GetBorderSize() > 0 )
 798         DrawBorders(dc);
 799     DrawSash(dc);
 800
 801     SetNeedUpdating(FALSE);
 802 }
 803
 804 // Set pane for unsplit window
 805 void wxSplitterWindow::Initialize(wxWindow *window)
 806 {
 807     wxASSERT_MSG( window && window->GetParent() == this,
 808                   _T("windows in the splitter should have it as parent!") );
 809
 810     m_windowOne = window;
 811     m_windowTwo = (wxWindow *) NULL;
 812     DoSetSashPosition(0);
 813 }
 814
 815 // Associates the given window with window 2, drawing the appropriate sash
 816 // and changing the split mode.
 817 // Does nothing and returns FALSE if the window is already split.
 818 bool wxSplitterWindow::DoSplit(wxSplitMode mode,
 819                                wxWindow *window1, wxWindow *window2,
 820                                int sashPosition)
 821 {
 822     if ( IsSplit() )
 823         return FALSE;
 824
 825     wxCHECK_MSG( window1 && window2, FALSE,
 826                  _T("can not split with NULL window(s)") );
 827
 828     wxCHECK_MSG( window1->GetParent() == this && window2->GetParent() == this, FALSE,
 829                   _T("windows in the splitter should have it as parent!") );
 830
 831     m_splitMode = mode;
 832     m_windowOne = window1;
 833     m_windowTwo = window2;
 834
 835     // remember the sash position we want to set for later if we can't set it
 836     // right now (e.g. because the window is too small)
 837     m_requestedSashPosition = sashPosition;
 838
 839     DoSetSashPosition(ConvertSashPosition(sashPosition));
 840
 841     SizeWindows();
 842
 843     return TRUE;
 844 }
 845
 846 int wxSplitterWindow::ConvertSashPosition(int sashPosition) const
 847 {
 848     if ( sashPosition > 0 )
 849     {
 850         return sashPosition;
 851     }
 852     else if ( sashPosition < 0 )
 853     {
 854         // It's negative so adding is subtracting
 855         return GetWindowSize() + sashPosition;
 856     }
 857     else // sashPosition == 0
 858     {
 859         // default, put it in the centre
 860         return GetWindowSize() / 2;
 861     }
 862 }
 863
 864 // Remove the specified (or second) window from the view
 865 // Doesn't actually delete the window.
 866 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 867 {
 868     if ( ! IsSplit() )
 869         return FALSE;
 870
 871     wxWindow *win = NULL;
 872     if ( toRemove == NULL || toRemove == m_windowTwo)
 873     {
 874         win = m_windowTwo ;
 875         m_windowTwo = (wxWindow *) NULL;
 876     }
 877     else if ( toRemove == m_windowOne )
 878     {
 879         win = m_windowOne ;
 880         m_windowOne = m_windowTwo;
 881         m_windowTwo = (wxWindow *) NULL;
 882     }
 883     else
 884     {
 885         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 886
 887         return FALSE;
 888     }
 889
 890     OnUnsplit(win);
 891     DoSetSashPosition(0);
 892     SizeWindows();
 893
 894     return TRUE;
 895 }
 896
 897 // Replace a window with another one
 898 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 899 {
 900     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 901     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 902
 903     if ( winOld == m_windowTwo )
 904     {
 905         m_windowTwo = winNew;
 906     }
 907     else if ( winOld == m_windowOne )
 908     {
 909         m_windowOne = winNew;
 910     }
 911     else
 912     {
 913         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 914
 915         return FALSE;
 916     }
 917
 918     SizeWindows();
 919
 920     return TRUE;
 921 }
 922
 923 void wxSplitterWindow::SetMinimumPaneSize(int min)
 924 {
 925     m_minimumPaneSize = min;
 926     SetSashPosition(m_sashPosition); // re-check limits
 927 }
 928
 929 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 930 {
 931     DoSetSashPosition(position);
 932
 933     if ( redraw )
 934     {
 935         SizeWindows();
 936     }
 937 }
 938
 939 // Initialize colours
 940 void wxSplitterWindow::InitColours()
 941 {
 942     wxDELETE( m_facePen );
 943     wxDELETE( m_faceBrush );
 944     wxDELETE( m_mediumShadowPen );
 945     wxDELETE( m_darkShadowPen );
 946     wxDELETE( m_lightShadowPen );
 947     wxDELETE( m_hilightPen );
 948
 949     // Shadow colours
 950 #ifndef __WIN16__
 951     wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
 952     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 953     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 954
 955     wxColour mediumShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW));
 956     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 957
 958     wxColour darkShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW));
 959     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 960
 961     wxColour lightShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT));
 962     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 963
 964     wxColour hilightColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT));
 965     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 966 #else
 967     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 968     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 969     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 970     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 971     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 972     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 973 #endif // __WIN16__
 974 }
 975
 976 bool wxSplitterWindow::DoSendEvent(wxSplitterEvent& event)
 977 {
 978     return !GetEventHandler()->ProcessEvent(event) || event.IsAllowed();
 979 }
 980
 981 // ---------------------------------------------------------------------------
 982 // wxSplitterWindow virtual functions: they now just generate the events
 983 // ---------------------------------------------------------------------------
 984
 985 bool wxSplitterWindow::OnSashPositionChange(int WXUNUSED(newSashPosition))
 986 {
 987     // always allow by default
 988     return TRUE;
 989 }
 990
 991 int wxSplitterWindow::OnSashPositionChanging(int newSashPosition)
 992 {
 993     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 994     const int UNSPLIT_THRESHOLD = 4;
 995
 996     // first of all, check if OnSashPositionChange() doesn't forbid this change
 997     if ( !OnSashPositionChange(newSashPosition) )
 998     {
 999         // it does
1000         return -1;
1001     }
1002
1003     // Obtain relevant window dimension for bottom / right threshold check
1004     int window_size = GetWindowSize();
1005
1006     bool unsplit_scenario = FALSE;
1007     if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
1008     {
1009         // Do edge detection if unsplit premitted
1010         if ( newSashPosition <= UNSPLIT_THRESHOLD )
1011         {
1012             // threshold top / left check
1013             newSashPosition = 0;
1014             unsplit_scenario = TRUE;
1015         }
1016         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
1017         {
1018             // threshold bottom/right check
1019             newSashPosition = window_size;
1020             unsplit_scenario = TRUE;
1021         }
1022     }
1023
1024     if ( !unsplit_scenario )
1025     {
1026         // If resultant pane would be too small, enlarge it
1027         newSashPosition = AdjustSashPosition(newSashPosition);
1028     }
1029
1030     // If the result is out of bounds it means minimum size is too big,
1031     // so split window in half as best compromise.
1032     if ( newSashPosition < 0 || newSashPosition > window_size )
1033         newSashPosition = window_size / 2;
1034
1035     // now let the event handler have it
1036     //
1037     // FIXME: shouldn't we do it before the adjustments above so as to ensure
1038     //        that the sash position is always reasonable?
1039     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING, this);
1040     event.m_data.pos = newSashPosition;
1041
1042     if ( !DoSendEvent(event) )
1043     {
1044         // the event handler vetoed the change
1045         newSashPosition = -1;
1046     }
1047     else
1048     {
1049         // it could have been changed by it
1050         newSashPosition = event.GetSashPosition();
1051     }
1052
1053     return newSashPosition;
1054 }
1055
1056 // Called when the sash is double-clicked. The default behaviour is to remove
1057 // the sash if the minimum pane size is zero.
1058 void wxSplitterWindow::OnDoubleClickSash(int x, int y)
1059 {
1060     wxCHECK_RET(m_windowTwo, wxT("splitter: no window to remove"));
1061
1062     // new code should handle events instead of using the virtual functions
1063     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED, this);
1064     event.m_data.pt.x = x;
1065     event.m_data.pt.y = y;
1066     if ( DoSendEvent(event) )
1067     {
1068         if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
1069         {
1070             wxWindow* win = m_windowTwo;
1071             if ( Unsplit(win) )
1072             {
1073                 wxSplitterEvent unsplitEvent(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
1074                 unsplitEvent.m_data.win = win;
1075                 (void)DoSendEvent(unsplitEvent);
1076             }
1077         }
1078     }
1079     //else: blocked by user
1080 }
1081
1082 void wxSplitterWindow::OnUnsplit(wxWindow *winRemoved)
1083 {
1084     // call this before calling the event handler which may delete the window
1085     winRemoved->Show(FALSE);
1086 }
1087
1088 #if defined( __WXMSW__ ) || defined( __WXMAC__)
1089
1090 // this is currently called (and needed) under MSW only...
1091 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& event)
1092 {
1093     // if we don't do it, the resizing cursor might be set for child window:
1094     // and like this we explicitly say that our cursor should not be used for
1095     // children windows which overlap us
1096
1097     if ( SashHitTest(event.GetX(), event.GetY()) )
1098     {
1099         // default processing is ok
1100         event.Skip();
1101     }
1102     //else: do nothing, in particular, don't call Skip()
1103 }
1104
1105 #endif // wxUSE_SPLITTER
1106 #endif // wxMSW
1107