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_IDLE(wxSplitterWindow::OnIdle)
  54     EVT_MOUSE_EVENTS(wxSplitterWindow::OnMouseEvent)
  55
  56 #if defined( __WXMSW__ ) || defined( __WXMAC__)
  57     EVT_SET_CURSOR(wxSplitterWindow::OnSetCursor)
  58 #endif // wxMSW
  59
  60     WX_EVENT_TABLE_CONTROL_CONTAINER(wxSplitterWindow)
  61 END_EVENT_TABLE()
  62
  63 WX_DELEGATE_TO_CONTROL_CONTAINER(wxSplitterWindow);
  64
  65 bool wxSplitterWindow::Create(wxWindow *parent, wxWindowID id,
  66                                    const wxPoint& pos,
  67                                    const wxSize& size,
  68                                    long style,
  69                                    const wxString& name)
  70 {
  71     // allow TABbing from one window to the other
  72     style |= wxTAB_TRAVERSAL;
  73
  74     if (!wxWindow::Create(parent, id, pos, size, style, name))
  75         return FALSE;
  76
  77     m_permitUnsplitAlways = (style & wxSP_PERMIT_UNSPLIT) != 0;
  78
  79     if ( style & wxSP_3DSASH )
  80         m_sashSize = 7;
  81     else
  82         m_sashSize = 3;
  83
  84     if ( style & wxSP_3DBORDER )
  85         m_borderSize = 2;
  86     else if ( style & wxSP_BORDER )
  87         m_borderSize = 1;
  88     else
  89         m_borderSize = 0;
  90
  91 #ifdef __WXMAC__
  92     int major,minor;
  93     wxGetOsVersion( &major, &minor );
  94     if (major >= 10)
  95         m_windowStyle |= wxSP_SASH_AQUA;
  96 #endif
  97
  98     return TRUE;
  99 }
 100
 101 void wxSplitterWindow::Init()
 102 {
 103     m_container.SetContainerWindow(this);
 104
 105     m_splitMode = wxSPLIT_VERTICAL;
 106     m_permitUnsplitAlways = TRUE;
 107     m_windowOne = (wxWindow *) NULL;
 108     m_windowTwo = (wxWindow *) NULL;
 109     m_dragMode = wxSPLIT_DRAG_NONE;
 110     m_oldX = 0;
 111     m_oldY = 0;
 112     m_firstX = 0;
 113     m_firstY = 0;
 114     m_sashSize = 3;
 115     m_borderSize = 0;
 116     m_sashPosition = m_requestedSashPosition = 0;
 117     m_minimumPaneSize = 0;
 118     m_sashCursorWE = wxCursor(wxCURSOR_SIZEWE);
 119     m_sashCursorNS = wxCursor(wxCURSOR_SIZENS);
 120     m_sashTrackerPen = new wxPen(*wxBLACK, 2, wxSOLID);
 121     m_lightShadowPen = (wxPen *) NULL;
 122     m_mediumShadowPen = (wxPen *) NULL;
 123     m_darkShadowPen = (wxPen *) NULL;
 124     m_faceBrush = (wxBrush *) NULL;
 125     m_facePen = (wxPen *) NULL;
 126     m_hilightPen = (wxPen *) NULL;
 127
 128     InitColours();
 129
 130     m_needUpdating = FALSE;
 131 }
 132
 133 wxSplitterWindow::~wxSplitterWindow()
 134 {
 135     delete m_sashTrackerPen;
 136     delete m_lightShadowPen;
 137     delete m_darkShadowPen;
 138     delete m_mediumShadowPen;
 139     delete m_hilightPen;
 140     delete m_facePen;
 141     delete m_faceBrush;
 142 }
 143
 144 void wxSplitterWindow::SetResizeCursor()
 145 {
 146     SetCursor(m_splitMode == wxSPLIT_VERTICAL ? m_sashCursorWE
 147                                               : m_sashCursorNS);
 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& event)
 160 {
 161     if (m_needUpdating)
 162         SizeWindows();
 163
 164     event.Skip();
 165 }
 166
 167 void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
 168 {
 169     int x = (int)event.GetX(),
 170         y = (int)event.GetY();
 171
 172 #if defined(__WXMSW__)
 173     // SetCursor(wxCursor());   // Is this required?
 174 #endif
 175
 176     if (GetWindowStyle() & wxSP_NOSASH)
 177         return;
 178
 179     // with wxSP_LIVE_UPDATE style the splitter windows are always resized
 180     // following the mouse movement while it drags the sash, without it we only
 181     // draw the sash at the new position but only resize the windows when the
 182     // dragging is finished
 183     bool isLive = (GetWindowStyleFlag() & wxSP_LIVE_UPDATE) != 0;
 184
 185     if (event.LeftDown())
 186     {
 187         if ( SashHitTest(x, y) )
 188         {
 189             // Start the drag now
 190             m_dragMode = wxSPLIT_DRAG_DRAGGING;
 191
 192             // Capture mouse and set the cursor
 193             CaptureMouse();
 194             SetResizeCursor();
 195
 196             if ( !isLive )
 197             {
 198                 // remember the initial sash position and draw the initial
 199                 // shadow sash
 200                 m_sashPositionCurrent = m_sashPosition;
 201
 202                 DrawSashTracker(x, y);
 203             }
 204
 205             m_oldX = x;
 206             m_oldY = y;
 207
 208             SetResizeCursor();
 209             return;
 210         }
 211     }
 212     else if (event.LeftUp() && m_dragMode == wxSPLIT_DRAG_DRAGGING)
 213     {
 214         // We can stop dragging now and see what we've got.
 215         m_dragMode = wxSPLIT_DRAG_NONE;
 216
 217         // Release mouse and unset the cursor
 218         ReleaseMouse();
 219         SetCursor(* wxSTANDARD_CURSOR);
 220
 221         // exit if unsplit after doubleclick
 222         if ( !IsSplit() )
 223         {
 224             return;
 225         }
 226
 227         // Erase old tracker
 228         if ( !isLive )
 229         {
 230             DrawSashTracker(m_oldX, m_oldY);
 231         }
 232
 233         // the position of the click doesn't exactly correspond to
 234         // m_sashPosition, rather it changes it by the distance by which the
 235         // mouse has moved
 236         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 237
 238         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 239         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 240         if ( posSashNew == -1 )
 241         {
 242             // change not allowed
 243             return;
 244         }
 245
 246         if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
 247         {
 248             // Deal with possible unsplit scenarios
 249             if ( posSashNew == 0 )
 250             {
 251                 // We remove the first window from the view
 252                 wxWindow *removedWindow = m_windowOne;
 253                 m_windowOne = m_windowTwo;
 254                 m_windowTwo = (wxWindow *) NULL;
 255                 OnUnsplit(removedWindow);
 256                 wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 257                 event.m_data.win = removedWindow;
 258                 (void)DoSendEvent(event);
 259                 SetSashPositionAndNotify(0);
 260             }
 261             else if ( posSashNew == GetWindowSize() )
 262             {
 263                 // We remove the second window from the view
 264                 wxWindow *removedWindow = m_windowTwo;
 265                 m_windowTwo = (wxWindow *) NULL;
 266                 OnUnsplit(removedWindow);
 267                 wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
 268                 event.m_data.win = removedWindow;
 269                 (void)DoSendEvent(event);
 270                 SetSashPositionAndNotify(0);
 271             }
 272             else
 273             {
 274                 SetSashPositionAndNotify(posSashNew);
 275             }
 276         }
 277         else
 278         {
 279             SetSashPositionAndNotify(posSashNew);
 280         }
 281
 282         SizeWindows();
 283     }  // left up && dragging
 284     else if (event.Moving() && !event.Dragging())
 285     {
 286         // Just change the cursor as required
 287         if ( SashHitTest(x, y) )
 288             SetResizeCursor();
 289         else
 290             SetCursor(* wxSTANDARD_CURSOR);
 291     }
 292     else if (event.Dragging() && (m_dragMode == wxSPLIT_DRAG_DRAGGING))
 293     {
 294         int diff = m_splitMode == wxSPLIT_VERTICAL ? x - m_oldX : y - m_oldY;
 295         if ( !diff )
 296         {
 297             // nothing to do, mouse didn't really move far enough
 298             return;
 299         }
 300
 301         int posSashOld = isLive ? m_sashPosition : m_sashPositionCurrent;
 302         int posSashNew = OnSashPositionChanging(posSashOld + diff);
 303         if ( posSashNew == -1 )
 304         {
 305             // change not allowed
 306             return;
 307         }
 308
 309         if ( posSashNew == m_sashPosition )
 310             return;
 311
 312         // Erase old tracker
 313         if ( !isLive )
 314         {
 315             DrawSashTracker(m_oldX, m_oldY);
 316         }
 317
 318         if (m_splitMode == wxSPLIT_VERTICAL)
 319             x = posSashNew;
 320         else
 321             y = posSashNew;
 322
 323         // Remember old positions
 324         m_oldX = x;
 325         m_oldY = y;
 326
 327 #ifdef __WXMSW__
 328         // As we captured the mouse, we may get the mouse events from outside
 329         // our window - for example, negative values in x, y. This has a weird
 330         // consequence under MSW where we use unsigned values sometimes and
 331         // signed ones other times: the coordinates turn as big positive
 332         // numbers and so the sash is drawn on the *right* side of the window
 333         // instead of the left (or bottom instead of top). Correct this.
 334         if ( (short)m_oldX < 0 )
 335             m_oldX = 0;
 336         if ( (short)m_oldY < 0 )
 337             m_oldY = 0;
 338 #endif // __WXMSW__
 339
 340         // Draw new one
 341         if ( !isLive )
 342         {
 343             m_sashPositionCurrent = posSashNew;
 344
 345             DrawSashTracker(m_oldX, m_oldY);
 346         }
 347         else
 348         {
 349             SetSashPositionAndNotify(posSashNew);
 350             m_needUpdating = TRUE;
 351         }
 352     }
 353     else if ( event.LeftDClick() && m_windowTwo )
 354     {
 355         OnDoubleClickSash(x, y);
 356     }
 357 }
 358
 359 void wxSplitterWindow::OnSize(wxSizeEvent& event)
 360 {
 361     // only process this message if we're not iconized - otherwise iconizing
 362     // and restoring a window containing the splitter has a funny side effect
 363     // of changing the splitter position!
 364     wxWindow *parent = GetParent();
 365     while ( parent && !parent->IsTopLevel() )
 366     {
 367         parent = parent->GetParent();
 368     }
 369
 370     bool iconized = FALSE;
 371
 372     // wxMotif doesn't yet have a wxTopLevelWindow implementation
 373 #ifdef __WXMOTIF__
 374     wxFrame *winTop = wxDynamicCast(parent, wxFrame);
 375 #else
 376     wxTopLevelWindow *winTop = wxDynamicCast(parent, wxTopLevelWindow);
 377 #endif
 378     if ( winTop )
 379     {
 380         iconized = winTop->IsIconized();
 381     }
 382 #ifndef __WXMOTIF__
 383     else
 384     {
 385         wxFAIL_MSG(wxT("should have a top level parent!"));
 386
 387         iconized = FALSE;
 388     }
 389 #endif
 390
 391     if ( iconized )
 392     {
 393         event.Skip();
 394
 395         return;
 396     }
 397
 398     int cw, ch;
 399     GetClientSize( &cw, &ch );
 400     if ( m_windowTwo )
 401     {
 402         if ( m_splitMode == wxSPLIT_VERTICAL )
 403         {
 404             if ( m_sashPosition >= (cw - 5) )
 405                 SetSashPositionAndNotify(wxMax(10, cw - 40));
 406         }
 407         else // m_splitMode == wxSPLIT_HORIZONTAL
 408         {
 409             if ( m_sashPosition >= (ch - 5) )
 410                 SetSashPositionAndNotify(wxMax(10, ch - 40));
 411         }
 412     }
 413
 414     SizeWindows();
 415 }
 416
 417 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 418 {
 419     if ( m_windowTwo == NULL || m_sashPosition == 0)
 420         return FALSE; // No sash
 421
 422     if ( m_splitMode == wxSPLIT_VERTICAL )
 423     {
 424         if ( (x >= m_sashPosition - tolerance) && (x <= m_sashPosition + m_sashSize + tolerance) )
 425             return TRUE;
 426         else
 427             return FALSE;
 428     }
 429     else
 430     {
 431         if ( (y >= (m_sashPosition- tolerance)) && (y <= (m_sashPosition + m_sashSize + tolerance)) )
 432             return TRUE;
 433         else
 434             return FALSE;
 435     }
 436 }
 437
 438 // Draw 3D effect borders
 439 void wxSplitterWindow::DrawBorders(wxDC& dc)
 440 {
 441     int w, h;
 442     GetClientSize(&w, &h);
 443
 444     if ( GetWindowStyleFlag() & wxSP_3DBORDER )
 445     {
 446
 447         dc.SetPen(*m_facePen);
 448         dc.SetBrush(*m_faceBrush);
 449         dc.DrawRectangle(1, 1 , w-1, m_borderSize-2 ); //high
 450         dc.DrawRectangle(1, m_borderSize-2 , m_borderSize-2, h-1 ); // left
 451         dc.DrawRectangle(w-m_borderSize+2, m_borderSize-2 , w-1, h-1 ); // right
 452         dc.DrawRectangle(m_borderSize-2, h-m_borderSize+2 , w-m_borderSize+2, h-1 ); //bottom
 453
 454         dc.SetPen(*m_mediumShadowPen);
 455         dc.DrawLine(m_borderSize-2, m_borderSize-2, w-m_borderSize+1, m_borderSize-2);
 456         dc.DrawLine(m_borderSize-2, m_borderSize-2, m_borderSize-2, h-m_borderSize+1);
 457
 458         dc.SetPen(*m_darkShadowPen);
 459         dc.DrawLine(m_borderSize-1, m_borderSize-1, w-m_borderSize, m_borderSize-1);
 460         dc.DrawLine(m_borderSize-1, m_borderSize-1, m_borderSize-1, h-m_borderSize);
 461
 462         dc.SetPen(*m_hilightPen);
 463         dc.DrawLine(m_borderSize - 2, h-m_borderSize+1, w-m_borderSize+1, h-m_borderSize+1);
 464         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.
 465                                      /// Anyway, h is required for MSW.
 466
 467         dc.SetPen(*m_lightShadowPen);
 468         dc.DrawLine(w-m_borderSize, m_borderSize-1, w-m_borderSize, h-m_borderSize); // Right hand side
 469         dc.DrawLine(m_borderSize-1, h-m_borderSize, w-m_borderSize+1, h-m_borderSize);     // Bottom
 470     }
 471     else if ( GetWindowStyleFlag() & wxSP_BORDER )
 472     {
 473         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 474         dc.SetPen(*wxBLACK_PEN);
 475         dc.DrawRectangle(0, 0, w-1, h-1);
 476     }
 477
 478     dc.SetPen(wxNullPen);
 479     dc.SetBrush(wxNullBrush);
 480 }
 481
 482 // Draw the sash
 483 void wxSplitterWindow::DrawSash(wxDC& dc)
 484 {
 485     if ( m_sashPosition == 0 || !m_windowTwo)
 486         return;
 487     if (GetWindowStyle() & wxSP_NOSASH)
 488         return;
 489
 490     int w, h;
 491     GetClientSize(&w, &h);
 492
 493     if ( GetWindowStyleFlag() & wxSP_3DSASH )
 494     {
 495         if ( m_splitMode == wxSPLIT_VERTICAL )
 496         {
 497             dc.SetPen(*m_facePen);
 498
 499             if (HasFlag( wxSP_SASH_AQUA ))
 500                 dc.SetBrush(*wxWHITE_BRUSH);
 501             else
 502                 dc.SetBrush(*m_faceBrush);
 503             dc.DrawRectangle(m_sashPosition + 2, 0 , m_sashSize - 4, h );
 504
 505             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 506
 507             dc.SetPen(*m_lightShadowPen);
 508             int xShadow = m_borderSize ? m_borderSize - 1 : 0 ;
 509             dc.DrawLine(m_sashPosition, xShadow , m_sashPosition, h-m_borderSize);
 510
 511             dc.SetPen(*m_hilightPen);
 512             dc.DrawLine(m_sashPosition+1, m_borderSize - 2, m_sashPosition+1, h - m_borderSize+2);
 513
 514             if (!HasFlag( wxSP_SASH_AQUA ))
 515                 dc.SetPen(*m_mediumShadowPen);
 516
 517             int yMedium = m_borderSize ? h-m_borderSize+1 : h ;
 518             dc.DrawLine(m_sashPosition+m_sashSize-2, xShadow, m_sashPosition+m_sashSize-2, yMedium);
 519
 520             if (HasFlag( wxSP_SASH_AQUA ))
 521                 dc.SetPen(*m_lightShadowPen);
 522             else
 523                 dc.SetPen(*m_darkShadowPen);
 524             dc.DrawLine(m_sashPosition+m_sashSize-1, m_borderSize, m_sashPosition+m_sashSize-1, h-m_borderSize );
 525
 526             // Draw the top and bottom edges of the sash, if requested
 527             if (GetWindowStyle() & wxSP_FULLSASH)
 528             {
 529                 // Top
 530                 dc.SetPen(*m_hilightPen);
 531                 dc.DrawLine(m_sashPosition+1, m_borderSize, m_sashPosition+m_sashSize-1, m_borderSize);
 532
 533                 // Bottom
 534                 dc.SetPen(*m_darkShadowPen);
 535                 dc.DrawLine(m_sashPosition+1, h-m_borderSize-1, m_sashPosition+m_sashSize-1, h-m_borderSize-1);
 536             }
 537         }
 538         else // wxSPLIT_HORIZONTAL
 539         {
 540             dc.SetPen(*m_facePen);
 541             if (HasFlag( wxSP_SASH_AQUA ))
 542                 dc.SetBrush(*wxWHITE_BRUSH);
 543             else
 544                 dc.SetBrush(*m_faceBrush);
 545             dc.DrawRectangle( m_borderSize-2, m_sashPosition + 2, w-m_borderSize+2, m_sashSize - 4);
 546
 547             dc.SetBrush(*wxTRANSPARENT_BRUSH);
 548
 549             dc.SetPen(*m_lightShadowPen);
 550             dc.DrawLine(m_borderSize-1, m_sashPosition, w-m_borderSize, m_sashPosition);
 551
 552             dc.SetPen(*m_hilightPen);
 553             dc.DrawLine(m_borderSize-2, m_sashPosition+1, w-m_borderSize+1, m_sashPosition+1);
 554
 555             if (!HasFlag( wxSP_SASH_AQUA ))
 556                 dc.SetPen(*m_mediumShadowPen);
 557             dc.DrawLine(m_borderSize-1, m_sashPosition+m_sashSize-2, w-m_borderSize+1, m_sashPosition+m_sashSize-2);
 558
 559             if (HasFlag( wxSP_SASH_AQUA ))
 560                 dc.SetPen(*m_lightShadowPen);
 561             else
 562                 dc.SetPen(*m_darkShadowPen);
 563             dc.DrawLine(m_borderSize, m_sashPosition+m_sashSize-1, w-m_borderSize, m_sashPosition+m_sashSize-1);
 564
 565             // Draw the left and right edges of the sash, if requested
 566             if (GetWindowStyle() & wxSP_FULLSASH)
 567             {
 568                 // Left
 569                 dc.SetPen(*m_hilightPen);
 570                 dc.DrawLine(m_borderSize, m_sashPosition, m_borderSize, m_sashPosition+m_sashSize);
 571
 572                 // Right
 573                 dc.SetPen(*m_darkShadowPen);
 574                 dc.DrawLine(w-m_borderSize-1, m_sashPosition+1, w-m_borderSize-1, m_sashPosition+m_sashSize-1);
 575             }
 576         }
 577     }
 578     else // !wxSP_3DSASH
 579     {
 580         dc.SetPen(*wxTRANSPARENT_PEN);
 581         dc.SetBrush(*m_faceBrush);
 582         if ( m_splitMode == wxSPLIT_VERTICAL )
 583         {
 584             int h1 = h-1;
 585             int y1 = 0;
 586             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 587                 h1 += 1; // Not sure why this is necessary...
 588             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 589             {
 590                 y1 = 2; h1 -= 3;
 591             }
 592             dc.DrawRectangle(m_sashPosition, y1, m_sashSize, h1);
 593         }
 594         else // wxSPLIT_HORIZONTAL
 595         {
 596             int w1 = w-1;
 597             int x1 = 0;
 598             if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 599                 w1 ++;
 600             if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 601             {
 602                 x1 = 2; w1 -= 3;
 603             }
 604             dc.DrawRectangle(x1, m_sashPosition, w1, m_sashSize);
 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             && newSashPosition >= m_sashPosition - GetBorderSize() )
 754         {
 755             // don't update it any more
 756             m_requestedSashPosition = INT_MAX;
 757         }
 758     }
 759
 760     int w, h;
 761     GetClientSize(&w, &h);
 762
 763     if ( GetWindow1() && !GetWindow2() )
 764     {
 765         GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 766                               w - 2*GetBorderSize(), h - 2*GetBorderSize());
 767     }
 768     else if ( GetWindow1() && GetWindow2() )
 769     {
 770         if (GetSplitMode() == wxSPLIT_VERTICAL)
 771         {
 772             int x1 = GetBorderSize();
 773             int y1 = GetBorderSize();
 774             int w1 = GetSashPosition() - GetBorderSize();
 775             int h1 = h - 2*GetBorderSize();
 776
 777             int x2 = GetSashPosition() + GetSashSize();
 778             int y2 = GetBorderSize();
 779             int w2 = w - 2*GetBorderSize() - GetSashSize() - w1;
 780             int h2 = h - 2*GetBorderSize();
 781
 782             GetWindow1()->SetSize(x1, y1, w1, h1);
 783             GetWindow2()->SetSize(x2, y2, w2, h2);
 784         }
 785         else
 786         {
 787             GetWindow1()->SetSize(GetBorderSize(), GetBorderSize(),
 788                 w - 2*GetBorderSize(), GetSashPosition() - GetBorderSize());
 789             GetWindow2()->SetSize(GetBorderSize(), GetSashPosition() + GetSashSize(),
 790                 w - 2*GetBorderSize(), h - 2*GetBorderSize() - GetSashSize() - (GetSashPosition() - GetBorderSize()));
 791         }
 792     }
 793     wxClientDC dc(this);
 794     if ( GetBorderSize() > 0 )
 795         DrawBorders(dc);
 796     DrawSash(dc);
 797
 798     SetNeedUpdating(FALSE);
 799 }
 800
 801 // Set pane for unsplit window
 802 void wxSplitterWindow::Initialize(wxWindow *window)
 803 {
 804     wxASSERT_MSG( window && window->GetParent() == this,
 805                   _T("windows in the splitter should have it as parent!") );
 806
 807     m_windowOne = window;
 808     m_windowTwo = (wxWindow *) NULL;
 809     DoSetSashPosition(0);
 810 }
 811
 812 // Associates the given window with window 2, drawing the appropriate sash
 813 // and changing the split mode.
 814 // Does nothing and returns FALSE if the window is already split.
 815 bool wxSplitterWindow::DoSplit(wxSplitMode mode,
 816                                wxWindow *window1, wxWindow *window2,
 817                                int sashPosition)
 818 {
 819     if ( IsSplit() )
 820         return FALSE;
 821
 822     wxCHECK_MSG( window1 && window2, FALSE,
 823                  _T("can not split with NULL window(s)") );
 824
 825     wxCHECK_MSG( window1->GetParent() == this && window2->GetParent() == this, FALSE,
 826                   _T("windows in the splitter should have it as parent!") );
 827
 828     m_splitMode = mode;
 829     m_windowOne = window1;
 830     m_windowTwo = window2;
 831
 832     // remember the sash position we want to set for later if we can't set it
 833     // right now (e.g. because the window is too small)
 834     m_requestedSashPosition = sashPosition;
 835
 836     DoSetSashPosition(ConvertSashPosition(sashPosition));
 837
 838     SizeWindows();
 839
 840     return TRUE;
 841 }
 842
 843 int wxSplitterWindow::ConvertSashPosition(int sashPosition) const
 844 {
 845     if ( sashPosition > 0 )
 846     {
 847         return sashPosition;
 848     }
 849     else if ( sashPosition < 0 )
 850     {
 851         // It's negative so adding is subtracting
 852         return GetWindowSize() + sashPosition;
 853     }
 854     else // sashPosition == 0
 855     {
 856         // default, put it in the centre
 857         return GetWindowSize() / 2;
 858     }
 859 }
 860
 861 // Remove the specified (or second) window from the view
 862 // Doesn't actually delete the window.
 863 bool wxSplitterWindow::Unsplit(wxWindow *toRemove)
 864 {
 865     if ( ! IsSplit() )
 866         return FALSE;
 867
 868     wxWindow *win = NULL;
 869     if ( toRemove == NULL || toRemove == m_windowTwo)
 870     {
 871         win = m_windowTwo ;
 872         m_windowTwo = (wxWindow *) NULL;
 873     }
 874     else if ( toRemove == m_windowOne )
 875     {
 876         win = m_windowOne ;
 877         m_windowOne = m_windowTwo;
 878         m_windowTwo = (wxWindow *) NULL;
 879     }
 880     else
 881     {
 882         wxFAIL_MSG(wxT("splitter: attempt to remove a non-existent window"));
 883
 884         return FALSE;
 885     }
 886
 887     OnUnsplit(win);
 888     DoSetSashPosition(0);
 889     SizeWindows();
 890
 891     return TRUE;
 892 }
 893
 894 // Replace a window with another one
 895 bool wxSplitterWindow::ReplaceWindow(wxWindow *winOld, wxWindow *winNew)
 896 {
 897     wxCHECK_MSG( winOld, FALSE, wxT("use one of Split() functions instead") );
 898     wxCHECK_MSG( winNew, FALSE, wxT("use Unsplit() functions instead") );
 899
 900     if ( winOld == m_windowTwo )
 901     {
 902         m_windowTwo = winNew;
 903     }
 904     else if ( winOld == m_windowOne )
 905     {
 906         m_windowOne = winNew;
 907     }
 908     else
 909     {
 910         wxFAIL_MSG(wxT("splitter: attempt to replace a non-existent window"));
 911
 912         return FALSE;
 913     }
 914
 915     SizeWindows();
 916
 917     return TRUE;
 918 }
 919
 920 void wxSplitterWindow::SetMinimumPaneSize(int min)
 921 {
 922     m_minimumPaneSize = min;
 923     SetSashPosition(m_sashPosition); // re-check limits
 924 }
 925
 926 void wxSplitterWindow::SetSashPosition(int position, bool redraw)
 927 {
 928     DoSetSashPosition(position);
 929
 930     if ( redraw )
 931     {
 932         SizeWindows();
 933     }
 934 }
 935
 936 // Initialize colours
 937 void wxSplitterWindow::InitColours()
 938 {
 939     wxDELETE( m_facePen );
 940     wxDELETE( m_faceBrush );
 941     wxDELETE( m_mediumShadowPen );
 942     wxDELETE( m_darkShadowPen );
 943     wxDELETE( m_lightShadowPen );
 944     wxDELETE( m_hilightPen );
 945
 946     // Shadow colours
 947 #ifndef __WIN16__
 948     wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
 949     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 950     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 951
 952     wxColour mediumShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW));
 953     m_mediumShadowPen = new wxPen(mediumShadowColour, 1, wxSOLID);
 954
 955     wxColour darkShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW));
 956     m_darkShadowPen = new wxPen(darkShadowColour, 1, wxSOLID);
 957
 958     wxColour lightShadowColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT));
 959     m_lightShadowPen = new wxPen(lightShadowColour, 1, wxSOLID);
 960
 961     wxColour hilightColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT));
 962     m_hilightPen = new wxPen(hilightColour, 1, wxSOLID);
 963 #else
 964     m_facePen = new wxPen("LIGHT GREY", 1, wxSOLID);
 965     m_faceBrush = new wxBrush("LIGHT GREY", wxSOLID);
 966     m_mediumShadowPen = new wxPen("GREY", 1, wxSOLID);
 967     m_darkShadowPen = new wxPen("BLACK", 1, wxSOLID);
 968     m_lightShadowPen = new wxPen("LIGHT GREY", 1, wxSOLID);
 969     m_hilightPen = new wxPen("WHITE", 1, wxSOLID);
 970 #endif // __WIN16__
 971 }
 972
 973 bool wxSplitterWindow::DoSendEvent(wxSplitterEvent& event)
 974 {
 975     return !GetEventHandler()->ProcessEvent(event) || event.IsAllowed();
 976 }
 977
 978 // ---------------------------------------------------------------------------
 979 // wxSplitterWindow virtual functions: they now just generate the events
 980 // ---------------------------------------------------------------------------
 981
 982 bool wxSplitterWindow::OnSashPositionChange(int WXUNUSED(newSashPosition))
 983 {
 984     // always allow by default
 985     return TRUE;
 986 }
 987
 988 int wxSplitterWindow::OnSashPositionChanging(int newSashPosition)
 989 {
 990     // If within UNSPLIT_THRESHOLD from edge, set to edge to cause closure.
 991     const int UNSPLIT_THRESHOLD = 4;
 992
 993     // first of all, check if OnSashPositionChange() doesn't forbid this change
 994     if ( !OnSashPositionChange(newSashPosition) )
 995     {
 996         // it does
 997         return -1;
 998     }
 999
1000     // Obtain relevant window dimension for bottom / right threshold check
1001     int window_size = GetWindowSize();
1002
1003     bool unsplit_scenario = FALSE;
1004     if ( m_permitUnsplitAlways || m_minimumPaneSize == 0 )
1005     {
1006         // Do edge detection if unsplit premitted
1007         if ( newSashPosition <= UNSPLIT_THRESHOLD )
1008         {
1009             // threshold top / left check
1010             newSashPosition = 0;
1011             unsplit_scenario = TRUE;
1012         }
1013         if ( newSashPosition >= window_size - UNSPLIT_THRESHOLD )
1014         {
1015             // threshold bottom/right check
1016             newSashPosition = window_size;
1017             unsplit_scenario = TRUE;
1018         }
1019     }
1020
1021     if ( !unsplit_scenario )
1022     {
1023         // If resultant pane would be too small, enlarge it
1024         newSashPosition = AdjustSashPosition(newSashPosition);
1025     }
1026
1027     // If the result is out of bounds it means minimum size is too big,
1028     // so split window in half as best compromise.
1029     if ( newSashPosition < 0 || newSashPosition > window_size )
1030         newSashPosition = window_size / 2;
1031
1032     // now let the event handler have it
1033     //
1034     // FIXME: shouldn't we do it before the adjustments above so as to ensure
1035     //        that the sash position is always reasonable?
1036     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING, this);
1037     event.m_data.pos = newSashPosition;
1038
1039     if ( !DoSendEvent(event) )
1040     {
1041         // the event handler vetoed the change
1042         newSashPosition = -1;
1043     }
1044     else
1045     {
1046         // it could have been changed by it
1047         newSashPosition = event.GetSashPosition();
1048     }
1049
1050     return newSashPosition;
1051 }
1052
1053 // Called when the sash is double-clicked. The default behaviour is to remove
1054 // the sash if the minimum pane size is zero.
1055 void wxSplitterWindow::OnDoubleClickSash(int x, int y)
1056 {
1057     wxCHECK_RET(m_windowTwo, wxT("splitter: no window to remove"));
1058
1059     // new code should handle events instead of using the virtual functions
1060     wxSplitterEvent event(wxEVT_COMMAND_SPLITTER_DOUBLECLICKED, this);
1061     event.m_data.pt.x = x;
1062     event.m_data.pt.y = y;
1063     if ( DoSendEvent(event) )
1064     {
1065         if ( GetMinimumPaneSize() == 0 || m_permitUnsplitAlways )
1066         {
1067             wxWindow* win = m_windowTwo;
1068             if ( Unsplit(win) )
1069             {
1070                 wxSplitterEvent unsplitEvent(wxEVT_COMMAND_SPLITTER_UNSPLIT, this);
1071                 unsplitEvent.m_data.win = win;
1072                 (void)DoSendEvent(unsplitEvent);
1073             }
1074         }
1075     }
1076     //else: blocked by user
1077 }
1078
1079 void wxSplitterWindow::OnUnsplit(wxWindow *winRemoved)
1080 {
1081     // call this before calling the event handler which may delete the window
1082     winRemoved->Show(FALSE);
1083 }
1084
1085 #if defined( __WXMSW__ ) || defined( __WXMAC__)
1086
1087 // this is currently called (and needed) under MSW only...
1088 void wxSplitterWindow::OnSetCursor(wxSetCursorEvent& event)
1089 {
1090     // if we don't do it, the resizing cursor might be set for child window:
1091     // and like this we explicitly say that our cursor should not be used for
1092     // children windows which overlap us
1093
1094     if ( SashHitTest(event.GetX(), event.GetY()) )
1095     {
1096         // default processing is ok
1097         event.Skip();
1098     }
1099     //else: do nothing, in particular, don't call Skip()
1100 }
1101
1102 #endif // wxUSE_SPLITTER
1103 #endif // wxMSW
1104