src/generic/sashwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        sashwin.cpp
   3 // Purpose:     wxSashWindow implementation. A sash window has an optional
   4 //              sash on each edge, allowing it to be dragged. An event
   5 //              is generated when the sash is released.
   6 // Author:      Julian Smart
   7 // Modified by:
   8 // Created:     01/02/97
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) Julian Smart
  11 // Licence:     wxWindows license
  12 /////////////////////////////////////////////////////////////////////////////
  13
  14 #ifdef __GNUG__
  15 #pragma implementation "sashwin.h"
  16 #endif
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22 #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26 #include "wx/wx.h"
  27 #endif
  28
  29 #if wxUSE_SASH
  30
  31 #include <math.h>
  32 #include <stdlib.h>
  33
  34 #include "wx/string.h"
  35 #include "wx/dcscreen.h"
  36 #include "wx/sashwin.h"
  37 #include "wx/laywin.h"
  38
  39 IMPLEMENT_DYNAMIC_CLASS(wxSashWindow, wxWindow)
  40 IMPLEMENT_DYNAMIC_CLASS(wxSashEvent, wxCommandEvent)
  41
  42 BEGIN_EVENT_TABLE(wxSashWindow, wxWindow)
  43     EVT_PAINT(wxSashWindow::OnPaint)
  44     EVT_SIZE(wxSashWindow::OnSize)
  45     EVT_MOUSE_EVENTS(wxSashWindow::OnMouseEvent)
  46 END_EVENT_TABLE()
  47
  48 wxSashWindow::wxSashWindow()
  49 {
  50     m_draggingEdge = wxSASH_NONE;
  51     m_dragMode = wxSASH_DRAG_NONE;
  52     m_oldX = 0;
  53     m_oldY = 0;
  54     m_firstX = 0;
  55     m_firstY = 0;
  56     m_borderSize = 3 ;
  57     m_extraBorderSize = 0;
  58     m_sashCursorWE = NULL;
  59     m_sashCursorNS = NULL;
  60
  61     m_minimumPaneSizeX = 0;
  62     m_minimumPaneSizeY = 0;
  63     m_maximumPaneSizeX = 10000;
  64     m_maximumPaneSizeY = 10000;
  65 }
  66
  67 wxSashWindow::wxSashWindow(wxWindow *parent, wxWindowID id, const wxPoint& pos,
  68     const wxSize& size, long style, const wxString& name)
  69   :wxWindow(parent, id, pos, size, style, name)
  70 {
  71     m_draggingEdge = wxSASH_NONE;
  72     m_dragMode = wxSASH_DRAG_NONE;
  73     m_oldX = 0;
  74     m_oldY = 0;
  75     m_firstX = 0;
  76     m_firstY = 0;
  77     m_borderSize = 3;
  78     m_extraBorderSize = 0;
  79     m_minimumPaneSizeX = 0;
  80     m_minimumPaneSizeY = 0;
  81     m_maximumPaneSizeX = 10000;
  82     m_maximumPaneSizeY = 10000;
  83     m_sashCursorWE = new wxCursor(wxCURSOR_SIZEWE);
  84     m_sashCursorNS = new wxCursor(wxCURSOR_SIZENS);
  85
  86     // Eventually, we'll respond to colour change messages
  87     InitColours();
  88 }
  89
  90 wxSashWindow::~wxSashWindow()
  91 {
  92     delete m_sashCursorWE;
  93     delete m_sashCursorNS;
  94 }
  95
  96 void wxSashWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
  97 {
  98     wxPaintDC dc(this);
  99
 100     //    if ( m_borderSize > 0 )
 101     DrawBorders(dc);
 102
 103     DrawSashes(dc);
 104 }
 105
 106 void wxSashWindow::OnMouseEvent(wxMouseEvent& event)
 107 {
 108     wxCoord x, y;
 109     event.GetPosition(&x, &y);
 110
 111     wxSashEdgePosition sashHit = SashHitTest(x, y);
 112
 113     // reset the cursor
 114 #ifdef __WXMOTIF__
 115     SetCursor(* wxSTANDARD_CURSOR);
 116 #endif
 117 #ifdef __WXMSW__
 118     SetCursor(wxCursor());
 119 #endif
 120
 121     if (event.LeftDown())
 122     {
 123         CaptureMouse();
 124
 125         if ( sashHit != wxSASH_NONE )
 126         {
 127             // Required for X to specify that
 128             // that we wish to draw on top of all windows
 129             // - and we optimise by specifying the area
 130             // for creating the overlap window.
 131             // Find the first frame or dialog and use this to specify
 132             // the area to draw on.
 133             wxWindow* parent = this;
 134
 135             while (parent && !parent->IsKindOf(CLASSINFO(wxDialog)) &&
 136                              !parent->IsKindOf(CLASSINFO(wxFrame)))
 137               parent = parent->GetParent();
 138
 139             wxScreenDC::StartDrawingOnTop(parent);
 140
 141             // We don't say we're dragging yet; we leave that
 142             // decision for the Dragging() branch, to ensure
 143             // the user has dragged a little bit.
 144             m_dragMode = wxSASH_DRAG_LEFT_DOWN;
 145             m_draggingEdge = sashHit;
 146             m_firstX = x;
 147             m_firstY = y;
 148
 149             if ( (sashHit == wxSASH_LEFT) || (sashHit == wxSASH_RIGHT) )
 150             {
 151                 SetCursor(*m_sashCursorWE);
 152             }
 153             else
 154             {
 155                 SetCursor(*m_sashCursorNS);
 156             }
 157         }
 158     }
 159     else if ( event.LeftUp() && m_dragMode == wxSASH_DRAG_LEFT_DOWN )
 160     {
 161         // Wasn't a proper drag
 162         ReleaseMouse();
 163         wxScreenDC::EndDrawingOnTop();
 164         m_dragMode = wxSASH_DRAG_NONE;
 165         m_draggingEdge = wxSASH_NONE;
 166     }
 167     else if (event.LeftUp() && m_dragMode == wxSASH_DRAG_DRAGGING)
 168     {
 169         // We can stop dragging now and see what we've got.
 170         m_dragMode = wxSASH_DRAG_NONE;
 171         ReleaseMouse();
 172         // Erase old tracker
 173         DrawSashTracker(m_draggingEdge, m_oldX, m_oldY);
 174
 175         // End drawing on top (frees the window used for drawing
 176         // over the screen)
 177         wxScreenDC::EndDrawingOnTop();
 178
 179         int w, h;
 180         GetSize(&w, &h);
 181         int xp, yp;
 182         GetPosition(&xp, &yp);
 183
 184         wxSashEdgePosition edge = m_draggingEdge;
 185         m_draggingEdge = wxSASH_NONE;
 186
 187         wxRect dragRect;
 188         wxSashDragStatus status = wxSASH_STATUS_OK;
 189
 190         // the new height and width of the window - if -1, it didn't change
 191         int newHeight = -1,
 192             newWidth = -1;
 193
 194         // NB: x and y may be negative and they're relative to the sash window
 195         //     upper left corner, while xp and yp are expressed in the parent
 196         //     window system of coordinates, so adjust them! After this
 197         //     adjustment, all coordinates are relative to the parent window.
 198         y += yp;
 199         x += xp;
 200
 201         switch (edge)
 202         {
 203             case wxSASH_TOP:
 204                 if ( y > yp + h )
 205                 {
 206                     // top sash shouldn't get below the bottom one
 207                     status = wxSASH_STATUS_OUT_OF_RANGE;
 208                 }
 209                 else
 210                 {
 211                     newHeight = h - (y - yp);
 212                 }
 213                 break;
 214
 215             case wxSASH_BOTTOM:
 216                 if ( y < yp )
 217                 {
 218                     // bottom sash shouldn't get above the top one
 219                     status = wxSASH_STATUS_OUT_OF_RANGE;
 220                 }
 221                 else
 222                 {
 223                     newHeight = y - yp;
 224                 }
 225                 break;
 226
 227             case wxSASH_LEFT:
 228                 if ( x > xp + w )
 229                 {
 230                     // left sash shouldn't get beyond the right one
 231                     status = wxSASH_STATUS_OUT_OF_RANGE;
 232                 }
 233                 else
 234                 {
 235                     newWidth = w - (x - xp);
 236                 }
 237                 break;
 238
 239             case wxSASH_RIGHT:
 240                 if ( x < xp )
 241                 {
 242                     // and the right sash, finally, shouldn't be beyond the
 243                     // left one
 244                     status = wxSASH_STATUS_OUT_OF_RANGE;
 245                 }
 246                 else
 247                 {
 248                     newWidth = x - xp;
 249                 }
 250                 break;
 251
 252             case wxSASH_NONE:
 253                 // can this happen at all?
 254                 break;
 255         }
 256
 257         if ( newHeight == -1 )
 258         {
 259             // didn't change
 260             newHeight = h;
 261         }
 262         else
 263         {
 264             // make sure it's in m_minimumPaneSizeY..m_maximumPaneSizeY range
 265             newHeight = wxMax(newHeight, m_minimumPaneSizeY);
 266             newHeight = wxMin(newHeight, m_maximumPaneSizeY);
 267         }
 268
 269         if ( newWidth == -1 )
 270         {
 271             // didn't change
 272             newWidth = w;
 273         }
 274         else
 275         {
 276             // make sure it's in m_minimumPaneSizeY..m_maximumPaneSizeY range
 277             newWidth = wxMax(newWidth, m_minimumPaneSizeX);
 278             newWidth = wxMin(newWidth, m_maximumPaneSizeX);
 279         }
 280
 281         dragRect = wxRect(x, y, newWidth, newHeight);
 282
 283         wxSashEvent event(GetId(), edge);
 284         event.SetEventObject(this);
 285         event.SetDragStatus(status);
 286         event.SetDragRect(dragRect);
 287         GetEventHandler()->ProcessEvent(event);
 288     }
 289     else if ( event.LeftUp() )
 290     {
 291         ReleaseMouse();
 292     }
 293     else if (event.Moving() && !event.Dragging())
 294     {
 295         // Just change the cursor if required
 296         if ( sashHit != wxSASH_NONE )
 297         {
 298             if ( (sashHit == wxSASH_LEFT) || (sashHit == wxSASH_RIGHT) )
 299             {
 300                 SetCursor(*m_sashCursorWE);
 301             }
 302             else
 303             {
 304                 SetCursor(*m_sashCursorNS);
 305             }
 306         }
 307     }
 308     else if ( event.Dragging() &&
 309               ((m_dragMode == wxSASH_DRAG_DRAGGING) ||
 310                (m_dragMode == wxSASH_DRAG_LEFT_DOWN)) )
 311     {
 312         if ( (m_draggingEdge == wxSASH_LEFT) || (m_draggingEdge == wxSASH_RIGHT) )
 313         {
 314             SetCursor(*m_sashCursorWE);
 315         }
 316         else
 317         {
 318             SetCursor(*m_sashCursorNS);
 319         }
 320
 321         if (m_dragMode == wxSASH_DRAG_LEFT_DOWN)
 322         {
 323             m_dragMode = wxSASH_DRAG_DRAGGING;
 324             DrawSashTracker(m_draggingEdge, x, y);
 325         }
 326         else
 327         {
 328             if ( m_dragMode == wxSASH_DRAG_DRAGGING )
 329             {
 330                 // Erase old tracker
 331                 DrawSashTracker(m_draggingEdge, m_oldX, m_oldY);
 332
 333                 // Draw new one
 334                 DrawSashTracker(m_draggingEdge, x, y);
 335             }
 336         }
 337         m_oldX = x;
 338         m_oldY = y;
 339     }
 340     else if ( event.LeftDClick() )
 341     {
 342         // Nothing
 343     }
 344     else
 345     {
 346     }
 347 }
 348
 349 void wxSashWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 350 {
 351     SizeWindows();
 352 }
 353
 354 wxSashEdgePosition wxSashWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
 355 {
 356     int cx, cy;
 357     GetClientSize(& cx, & cy);
 358
 359     int i;
 360     for (i = 0; i < 4; i++)
 361     {
 362         wxSashEdge& edge = m_sashes[i];
 363         wxSashEdgePosition position = (wxSashEdgePosition) i ;
 364
 365         if (edge.m_show)
 366         {
 367             switch (position)
 368             {
 369                 case wxSASH_TOP:
 370                 {
 371                     if (y >= 0 && y <= GetEdgeMargin(position))
 372                         return wxSASH_TOP;
 373                     break;
 374                 }
 375                 case wxSASH_RIGHT:
 376                 {
 377                     if ((x >= cx - GetEdgeMargin(position)) && (x <= cx))
 378                         return wxSASH_RIGHT;
 379                     break;
 380                 }
 381                 case wxSASH_BOTTOM:
 382                 {
 383                     if ((y >= cy - GetEdgeMargin(position)) && (y <= cy))
 384                         return wxSASH_BOTTOM;
 385                     break;
 386                 }
 387                 case wxSASH_LEFT:
 388                 {
 389                     if ((x <= GetEdgeMargin(position)) && (x >= 0))
 390                         return wxSASH_LEFT;
 391                     break;
 392                 }
 393                 case wxSASH_NONE:
 394                 {
 395                     break;
 396                 }
 397             }
 398         }
 399     }
 400     return wxSASH_NONE;
 401 }
 402
 403 // Draw 3D effect borders
 404 void wxSashWindow::DrawBorders(wxDC& dc)
 405 {
 406     int w, h;
 407     GetClientSize(&w, &h);
 408
 409     wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
 410     wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
 411     wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
 412     wxPen hilightPen(m_hilightColour, 1, wxSOLID);
 413
 414     if ( GetWindowStyleFlag() & wxSW_3D )
 415     {
 416         dc.SetPen(mediumShadowPen);
 417         dc.DrawLine(0, 0, w-1, 0);
 418         dc.DrawLine(0, 0, 0, h - 1);
 419
 420         dc.SetPen(darkShadowPen);
 421         dc.DrawLine(1, 1, w-2, 1);
 422         dc.DrawLine(1, 1, 1, h-2);
 423
 424         dc.SetPen(hilightPen);
 425         dc.DrawLine(0, h-1, w-1, h-1);
 426         dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
 427                                      /// Anyway, h is required for MSW.
 428
 429         dc.SetPen(lightShadowPen);
 430         dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
 431         dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
 432     }
 433     else if ( GetWindowStyleFlag() & wxSW_BORDER )
 434     {
 435         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 436         dc.SetPen(*wxBLACK_PEN);
 437         dc.DrawRectangle(0, 0, w-1, h-1);
 438     }
 439
 440     dc.SetPen(wxNullPen);
 441     dc.SetBrush(wxNullBrush);
 442 }
 443
 444 void wxSashWindow::DrawSashes(wxDC& dc)
 445 {
 446     int i;
 447     for (i = 0; i < 4; i++)
 448         if (m_sashes[i].m_show)
 449             DrawSash((wxSashEdgePosition) i, dc);
 450 }
 451
 452 // Draw the sash
 453 void wxSashWindow::DrawSash(wxSashEdgePosition edge, wxDC& dc)
 454 {
 455     int w, h;
 456     GetClientSize(&w, &h);
 457
 458     wxPen facePen(m_faceColour, 1, wxSOLID);
 459     wxBrush faceBrush(m_faceColour, wxSOLID);
 460     wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
 461     wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
 462     wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
 463     wxPen hilightPen(m_hilightColour, 1, wxSOLID);
 464     wxPen blackPen(wxColour(0, 0, 0), 1, wxSOLID);
 465     wxPen whitePen(wxColour(255, 255, 255), 1, wxSOLID);
 466
 467     if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
 468     {
 469         int sashPosition = 0;
 470         if (edge == wxSASH_LEFT)
 471             sashPosition = 0;
 472         else
 473             sashPosition = w - GetEdgeMargin(edge);
 474
 475         dc.SetPen(facePen);
 476         dc.SetBrush(faceBrush);
 477         dc.DrawRectangle(sashPosition, 0, GetEdgeMargin(edge), h);
 478
 479         if (GetWindowStyleFlag() & wxSW_3D)
 480         {
 481             if (edge == wxSASH_LEFT)
 482             {
 483                 // Draw a black line on the left to indicate that the
 484                 // sash is raised
 485                 dc.SetPen(blackPen);
 486                 dc.DrawLine(GetEdgeMargin(edge), 0, GetEdgeMargin(edge), h);
 487             }
 488             else
 489             {
 490                 // Draw a white line on the right to indicate that the
 491                 // sash is raised
 492                 dc.SetPen(whitePen);
 493                 dc.DrawLine(w - GetEdgeMargin(edge), 0, w - GetEdgeMargin(edge), h);
 494             }
 495         }
 496     }
 497     else // top or bottom
 498     {
 499         int sashPosition = 0;
 500         if (edge == wxSASH_TOP)
 501             sashPosition = 0;
 502         else
 503             sashPosition = h - GetEdgeMargin(edge);
 504
 505         dc.SetPen(facePen);
 506         dc.SetBrush(faceBrush);
 507         dc.DrawRectangle(0, sashPosition, w, GetEdgeMargin(edge));
 508
 509         if (GetWindowStyleFlag() & wxSW_3D)
 510         {
 511             if (edge == wxSASH_BOTTOM)
 512             {
 513                 // Draw a black line on the bottom to indicate that the
 514                 // sash is raised
 515                 dc.SetPen(blackPen);
 516                 dc.DrawLine(0, h - GetEdgeMargin(edge), w, h - GetEdgeMargin(edge));
 517             }
 518             else
 519             {
 520                 // Draw a white line on the top to indicate that the
 521                 // sash is raised
 522                 dc.SetPen(whitePen);
 523                 dc.DrawLine(0, GetEdgeMargin(edge), w, GetEdgeMargin(edge));
 524             }
 525         }
 526     }
 527
 528     dc.SetPen(wxNullPen);
 529     dc.SetBrush(wxNullBrush);
 530 }
 531
 532 // Draw the sash tracker (for whilst moving the sash)
 533 void wxSashWindow::DrawSashTracker(wxSashEdgePosition edge, int x, int y)
 534 {
 535     int w, h;
 536     GetClientSize(&w, &h);
 537
 538     wxScreenDC screenDC;
 539     int x1, y1;
 540     int x2, y2;
 541
 542     if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
 543     {
 544         x1 = x; y1 = 2;
 545         x2 = x; y2 = h-2;
 546
 547         if ( (edge == wxSASH_LEFT) && (x1 > w) )
 548         {
 549             x1 = w; x2 = w;
 550         }
 551         else if ( (edge == wxSASH_RIGHT) && (x1 < 0) )
 552         {
 553             x1 = 0; x2 = 0;
 554         }
 555     }
 556     else
 557     {
 558         x1 = 2; y1 = y;
 559         x2 = w-2; y2 = y;
 560
 561         if ( (edge == wxSASH_TOP) && (y1 > h) )
 562         {
 563             y1 = h;
 564             y2 = h;
 565         }
 566         else if ( (edge == wxSASH_BOTTOM) && (y1 < 0) )
 567         {
 568             y1 = 0;
 569             y2 = 0;
 570         }
 571     }
 572
 573     ClientToScreen(&x1, &y1);
 574     ClientToScreen(&x2, &y2);
 575
 576     wxPen sashTrackerPen(*wxBLACK, 2, wxSOLID);
 577
 578     screenDC.SetLogicalFunction(wxINVERT);
 579     screenDC.SetPen(sashTrackerPen);
 580     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 581
 582     screenDC.DrawLine(x1, y1, x2, y2);
 583
 584     screenDC.SetLogicalFunction(wxCOPY);
 585
 586     screenDC.SetPen(wxNullPen);
 587     screenDC.SetBrush(wxNullBrush);
 588 }
 589
 590 // Position and size subwindows.
 591 // Note that the border size applies to each subwindow, not
 592 // including the edges next to the sash.
 593 void wxSashWindow::SizeWindows()
 594 {
 595     int cw, ch;
 596     GetClientSize(&cw, &ch);
 597
 598     if (GetChildren().Number() == 1)
 599     {
 600         wxWindow* child = (wxWindow*) (GetChildren().First()->Data());
 601
 602         int x = 0;
 603         int y = 0;
 604         int width = cw;
 605         int height = ch;
 606
 607         // Top
 608         if (m_sashes[0].m_show)
 609         {
 610             y = m_borderSize;
 611             height -= m_borderSize;
 612         }
 613         y += m_extraBorderSize;
 614
 615         // Left
 616         if (m_sashes[3].m_show)
 617         {
 618             x = m_borderSize;
 619             width -= m_borderSize;
 620         }
 621         x += m_extraBorderSize;
 622
 623         // Right
 624         if (m_sashes[1].m_show)
 625         {
 626             width -= m_borderSize;
 627         }
 628         width -= 2*m_extraBorderSize;
 629
 630         // Bottom
 631         if (m_sashes[2].m_show)
 632         {
 633             height -= m_borderSize;
 634         }
 635         height -= 2*m_extraBorderSize;
 636
 637         child->SetSize(x, y, width, height);
 638     }
 639     else if (GetChildren().Number() > 1)
 640     {
 641         // Perhaps multiple children are themselves sash windows.
 642         // TODO: this doesn't really work because the subwindows sizes/positions
 643         // must be set to leave a gap for the parent's sash (hit-test and decorations).
 644         // Perhaps we can allow for this within LayoutWindow, testing whether the parent
 645         // is a sash window, and if so, allowing some space for the edges.
 646         wxLayoutAlgorithm layout;
 647         layout.LayoutWindow(this);
 648     }
 649
 650     wxClientDC dc(this);
 651     DrawBorders(dc);
 652     DrawSashes(dc);
 653 }
 654
 655 // Initialize colours
 656 void wxSashWindow::InitColours()
 657 {
 658     // Shadow colours
 659 #if defined(__WIN95__)
 660     m_faceColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 661     m_mediumShadowColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DSHADOW);
 662     m_darkShadowColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DDKSHADOW);
 663     m_lightShadowColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DLIGHT);
 664     m_hilightColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DHILIGHT);
 665 #else
 666     m_faceColour = *(wxTheColourDatabase->FindColour("LIGHT GREY"));
 667     m_mediumShadowColour = *(wxTheColourDatabase->FindColour("GREY"));
 668     m_darkShadowColour = *(wxTheColourDatabase->FindColour("BLACK"));
 669     m_lightShadowColour = *(wxTheColourDatabase->FindColour("LIGHT GREY"));
 670     m_hilightColour = *(wxTheColourDatabase->FindColour("WHITE"));
 671 #endif
 672 }
 673
 674 void wxSashWindow::SetSashVisible(wxSashEdgePosition edge, bool sash)
 675 {
 676      m_sashes[edge].m_show = sash;
 677      if (sash)
 678         m_sashes[edge].m_margin = m_borderSize;
 679      else
 680         m_sashes[edge].m_margin = 0;
 681 }
 682
 683 #endif // wxUSE_SASH