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 #if wxUSE_SASH
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/dialog.h"
  29     #include "wx/frame.h"
  30     #include "wx/settings.h"
  31 #endif
  32
  33 #include <math.h>
  34 #include <stdlib.h>
  35
  36 #include "wx/dcscreen.h"
  37 #include "wx/sashwin.h"
  38 #include "wx/laywin.h"
  39
  40 DEFINE_EVENT_TYPE(wxEVT_SASH_DRAGGED)
  41
  42 IMPLEMENT_DYNAMIC_CLASS(wxSashWindow, wxWindow)
  43 IMPLEMENT_DYNAMIC_CLASS(wxSashEvent, wxCommandEvent)
  44
  45 BEGIN_EVENT_TABLE(wxSashWindow, wxWindow)
  46     EVT_PAINT(wxSashWindow::OnPaint)
  47     EVT_SIZE(wxSashWindow::OnSize)
  48     EVT_MOUSE_EVENTS(wxSashWindow::OnMouseEvent)
  49 END_EVENT_TABLE()
  50
  51 bool wxSashWindow::Create(wxWindow *parent, wxWindowID id, const wxPoint& pos,
  52     const wxSize& size, long style, const wxString& name)
  53 {
  54     return wxWindow::Create(parent, id, pos, size, style, name);
  55 }
  56
  57 wxSashWindow::~wxSashWindow()
  58 {
  59     delete m_sashCursorWE;
  60     delete m_sashCursorNS;
  61 }
  62
  63 void wxSashWindow::Init()
  64 {
  65     m_draggingEdge = wxSASH_NONE;
  66     m_dragMode = wxSASH_DRAG_NONE;
  67     m_oldX = 0;
  68     m_oldY = 0;
  69     m_firstX = 0;
  70     m_firstY = 0;
  71     m_borderSize = 3;
  72     m_extraBorderSize = 0;
  73     m_minimumPaneSizeX = 0;
  74     m_minimumPaneSizeY = 0;
  75     m_maximumPaneSizeX = 10000;
  76     m_maximumPaneSizeY = 10000;
  77     m_sashCursorWE = new wxCursor(wxCURSOR_SIZEWE);
  78     m_sashCursorNS = new wxCursor(wxCURSOR_SIZENS);
  79     m_mouseCaptured = FALSE;
  80
  81     // Eventually, we'll respond to colour change messages
  82     InitColours();
  83 }
  84
  85 void wxSashWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
  86 {
  87     wxPaintDC dc(this);
  88
  89     //    if ( m_borderSize > 0 )
  90     DrawBorders(dc);
  91
  92     DrawSashes(dc);
  93 }
  94
  95 void wxSashWindow::OnMouseEvent(wxMouseEvent& event)
  96 {
  97     wxCoord x, y;
  98     event.GetPosition(&x, &y);
  99
 100     wxSashEdgePosition sashHit = SashHitTest(x, y);
 101
 102     // reset the cursor
 103 #if defined(__WXMOTIF__) || defined(__WXGTK__)
 104     // Not necessary and in fact inhibits proper cursor setting (JACS 8/2000)
 105     //SetCursor(* wxSTANDARD_CURSOR);
 106 #endif
 107 #ifdef __WXMSW__
 108     SetCursor(wxNullCursor);
 109 #endif
 110
 111     if (event.LeftDown())
 112     {
 113         CaptureMouse();
 114         m_mouseCaptured = TRUE;
 115
 116         if ( sashHit != wxSASH_NONE )
 117         {
 118             // Required for X to specify that
 119             // that we wish to draw on top of all windows
 120             // - and we optimise by specifying the area
 121             // for creating the overlap window.
 122             // Find the first frame or dialog and use this to specify
 123             // the area to draw on.
 124             wxWindow* parent = this;
 125
 126             while (parent && !parent->IsKindOf(CLASSINFO(wxDialog)) &&
 127                              !parent->IsKindOf(CLASSINFO(wxFrame)))
 128               parent = parent->GetParent();
 129
 130             wxScreenDC::StartDrawingOnTop(parent);
 131
 132             // We don't say we're dragging yet; we leave that
 133             // decision for the Dragging() branch, to ensure
 134             // the user has dragged a little bit.
 135             m_dragMode = wxSASH_DRAG_LEFT_DOWN;
 136             m_draggingEdge = sashHit;
 137             m_firstX = x;
 138             m_firstY = y;
 139
 140             if ( (sashHit == wxSASH_LEFT) || (sashHit == wxSASH_RIGHT) )
 141             {
 142                 SetCursor(*m_sashCursorWE);
 143             }
 144             else
 145             {
 146                 SetCursor(*m_sashCursorNS);
 147             }
 148         }
 149     }
 150     else if ( event.LeftUp() && m_dragMode == wxSASH_DRAG_LEFT_DOWN )
 151     {
 152         // Wasn't a proper drag
 153         if (m_mouseCaptured)
 154             ReleaseMouse();
 155         m_mouseCaptured = FALSE;
 156
 157         wxScreenDC::EndDrawingOnTop();
 158         m_dragMode = wxSASH_DRAG_NONE;
 159         m_draggingEdge = wxSASH_NONE;
 160     }
 161     else if (event.LeftUp() && m_dragMode == wxSASH_DRAG_DRAGGING)
 162     {
 163         // We can stop dragging now and see what we've got.
 164         m_dragMode = wxSASH_DRAG_NONE;
 165         if (m_mouseCaptured)
 166             ReleaseMouse();
 167         m_mouseCaptured = FALSE;
 168
 169         // Erase old tracker
 170         DrawSashTracker(m_draggingEdge, m_oldX, m_oldY);
 171
 172         // End drawing on top (frees the window used for drawing
 173         // over the screen)
 174         wxScreenDC::EndDrawingOnTop();
 175
 176         int w, h;
 177         GetSize(&w, &h);
 178         int xp, yp;
 179         GetPosition(&xp, &yp);
 180
 181         wxSashEdgePosition edge = m_draggingEdge;
 182         m_draggingEdge = wxSASH_NONE;
 183
 184         wxRect dragRect;
 185         wxSashDragStatus status = wxSASH_STATUS_OK;
 186
 187         // the new height and width of the window - if -1, it didn't change
 188         int newHeight = -1,
 189             newWidth = -1;
 190
 191         // NB: x and y may be negative and they're relative to the sash window
 192         //     upper left corner, while xp and yp are expressed in the parent
 193         //     window system of coordinates, so adjust them! After this
 194         //     adjustment, all coordinates are relative to the parent window.
 195         y += yp;
 196         x += xp;
 197
 198         switch (edge)
 199         {
 200             case wxSASH_TOP:
 201                 if ( y > yp + h )
 202                 {
 203                     // top sash shouldn't get below the bottom one
 204                     status = wxSASH_STATUS_OUT_OF_RANGE;
 205                 }
 206                 else
 207                 {
 208                     newHeight = h - (y - yp);
 209                 }
 210                 break;
 211
 212             case wxSASH_BOTTOM:
 213                 if ( y < yp )
 214                 {
 215                     // bottom sash shouldn't get above the top one
 216                     status = wxSASH_STATUS_OUT_OF_RANGE;
 217                 }
 218                 else
 219                 {
 220                     newHeight = y - yp;
 221                 }
 222                 break;
 223
 224             case wxSASH_LEFT:
 225                 if ( x > xp + w )
 226                 {
 227                     // left sash shouldn't get beyond the right one
 228                     status = wxSASH_STATUS_OUT_OF_RANGE;
 229                 }
 230                 else
 231                 {
 232                     newWidth = w - (x - xp);
 233                 }
 234                 break;
 235
 236             case wxSASH_RIGHT:
 237                 if ( x < xp )
 238                 {
 239                     // and the right sash, finally, shouldn't be beyond the
 240                     // left one
 241                     status = wxSASH_STATUS_OUT_OF_RANGE;
 242                 }
 243                 else
 244                 {
 245                     newWidth = x - xp;
 246                 }
 247                 break;
 248
 249             case wxSASH_NONE:
 250                 // can this happen at all?
 251                 break;
 252         }
 253
 254         if ( newHeight == -1 )
 255         {
 256             // didn't change
 257             newHeight = h;
 258         }
 259         else
 260         {
 261             // make sure it's in m_minimumPaneSizeY..m_maximumPaneSizeY range
 262             newHeight = wxMax(newHeight, m_minimumPaneSizeY);
 263             newHeight = wxMin(newHeight, m_maximumPaneSizeY);
 264         }
 265
 266         if ( newWidth == -1 )
 267         {
 268             // didn't change
 269             newWidth = w;
 270         }
 271         else
 272         {
 273             // make sure it's in m_minimumPaneSizeY..m_maximumPaneSizeY range
 274             newWidth = wxMax(newWidth, m_minimumPaneSizeX);
 275             newWidth = wxMin(newWidth, m_maximumPaneSizeX);
 276         }
 277
 278         dragRect = wxRect(x, y, newWidth, newHeight);
 279
 280         wxSashEvent event(GetId(), edge);
 281         event.SetEventObject(this);
 282         event.SetDragStatus(status);
 283         event.SetDragRect(dragRect);
 284         GetEventHandler()->ProcessEvent(event);
 285     }
 286     else if ( event.LeftUp() )
 287     {
 288         if (m_mouseCaptured)
 289            ReleaseMouse();
 290         m_mouseCaptured = FALSE;
 291     }
 292     else if (event.Moving() && !event.Dragging())
 293     {
 294         // Just change the cursor if required
 295         if ( sashHit != wxSASH_NONE )
 296         {
 297             if ( (sashHit == wxSASH_LEFT) || (sashHit == wxSASH_RIGHT) )
 298             {
 299                 SetCursor(*m_sashCursorWE);
 300             }
 301             else
 302             {
 303                 SetCursor(*m_sashCursorNS);
 304             }
 305         }
 306         else
 307         {
 308             SetCursor(wxNullCursor);
 309         }
 310     }
 311     else if ( event.Dragging() &&
 312               ((m_dragMode == wxSASH_DRAG_DRAGGING) ||
 313                (m_dragMode == wxSASH_DRAG_LEFT_DOWN)) )
 314     {
 315         if ( (m_draggingEdge == wxSASH_LEFT) || (m_draggingEdge == wxSASH_RIGHT) )
 316         {
 317             SetCursor(*m_sashCursorWE);
 318         }
 319         else
 320         {
 321             SetCursor(*m_sashCursorNS);
 322         }
 323
 324         if (m_dragMode == wxSASH_DRAG_LEFT_DOWN)
 325         {
 326             m_dragMode = wxSASH_DRAG_DRAGGING;
 327             DrawSashTracker(m_draggingEdge, x, y);
 328         }
 329         else
 330         {
 331             if ( m_dragMode == wxSASH_DRAG_DRAGGING )
 332             {
 333                 // Erase old tracker
 334                 DrawSashTracker(m_draggingEdge, m_oldX, m_oldY);
 335
 336                 // Draw new one
 337                 DrawSashTracker(m_draggingEdge, x, y);
 338             }
 339         }
 340         m_oldX = x;
 341         m_oldY = y;
 342     }
 343     else if ( event.LeftDClick() )
 344     {
 345         // Nothing
 346     }
 347     else
 348     {
 349     }
 350 }
 351
 352 void wxSashWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 353 {
 354     SizeWindows();
 355 }
 356
 357 wxSashEdgePosition wxSashWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
 358 {
 359     int cx, cy;
 360     GetClientSize(& cx, & cy);
 361
 362     int i;
 363     for (i = 0; i < 4; i++)
 364     {
 365         wxSashEdge& edge = m_sashes[i];
 366         wxSashEdgePosition position = (wxSashEdgePosition) i ;
 367
 368         if (edge.m_show)
 369         {
 370             switch (position)
 371             {
 372                 case wxSASH_TOP:
 373                 {
 374                     if (y >= 0 && y <= GetEdgeMargin(position))
 375                         return wxSASH_TOP;
 376                     break;
 377                 }
 378                 case wxSASH_RIGHT:
 379                 {
 380                     if ((x >= cx - GetEdgeMargin(position)) && (x <= cx))
 381                         return wxSASH_RIGHT;
 382                     break;
 383                 }
 384                 case wxSASH_BOTTOM:
 385                 {
 386                     if ((y >= cy - GetEdgeMargin(position)) && (y <= cy))
 387                         return wxSASH_BOTTOM;
 388                     break;
 389                 }
 390                 case wxSASH_LEFT:
 391                 {
 392                     if ((x <= GetEdgeMargin(position)) && (x >= 0))
 393                         return wxSASH_LEFT;
 394                     break;
 395                 }
 396                 case wxSASH_NONE:
 397                 {
 398                     break;
 399                 }
 400             }
 401         }
 402     }
 403     return wxSASH_NONE;
 404 }
 405
 406 // Draw 3D effect borders
 407 void wxSashWindow::DrawBorders(wxDC& dc)
 408 {
 409     int w, h;
 410     GetClientSize(&w, &h);
 411
 412     wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
 413     wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
 414     wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
 415     wxPen hilightPen(m_hilightColour, 1, wxSOLID);
 416
 417     if ( GetWindowStyleFlag() & wxSW_3DBORDER )
 418     {
 419         dc.SetPen(mediumShadowPen);
 420         dc.DrawLine(0, 0, w-1, 0);
 421         dc.DrawLine(0, 0, 0, h - 1);
 422
 423         dc.SetPen(darkShadowPen);
 424         dc.DrawLine(1, 1, w-2, 1);
 425         dc.DrawLine(1, 1, 1, h-2);
 426
 427         dc.SetPen(hilightPen);
 428         dc.DrawLine(0, h-1, w-1, h-1);
 429         dc.DrawLine(w-1, 0, w-1, h); // Surely the maximum y pos. should be h - 1.
 430                                      /// Anyway, h is required for MSW.
 431
 432         dc.SetPen(lightShadowPen);
 433         dc.DrawLine(w-2, 1, w-2, h-2); // Right hand side
 434         dc.DrawLine(1, h-2, w-1, h-2);     // Bottom
 435     }
 436     else if ( GetWindowStyleFlag() & wxSW_BORDER )
 437     {
 438         dc.SetBrush(*wxTRANSPARENT_BRUSH);
 439         dc.SetPen(*wxBLACK_PEN);
 440         dc.DrawRectangle(0, 0, w-1, h-1);
 441     }
 442
 443     dc.SetPen(wxNullPen);
 444     dc.SetBrush(wxNullBrush);
 445 }
 446
 447 void wxSashWindow::DrawSashes(wxDC& dc)
 448 {
 449     int i;
 450     for (i = 0; i < 4; i++)
 451         if (m_sashes[i].m_show)
 452             DrawSash((wxSashEdgePosition) i, dc);
 453 }
 454
 455 // Draw the sash
 456 void wxSashWindow::DrawSash(wxSashEdgePosition edge, wxDC& dc)
 457 {
 458     int w, h;
 459     GetClientSize(&w, &h);
 460
 461     wxPen facePen(m_faceColour, 1, wxSOLID);
 462     wxBrush faceBrush(m_faceColour, wxSOLID);
 463     wxPen mediumShadowPen(m_mediumShadowColour, 1, wxSOLID);
 464     wxPen darkShadowPen(m_darkShadowColour, 1, wxSOLID);
 465     wxPen lightShadowPen(m_lightShadowColour, 1, wxSOLID);
 466     wxPen hilightPen(m_hilightColour, 1, wxSOLID);
 467     wxPen blackPen(wxColour(0, 0, 0), 1, wxSOLID);
 468     wxPen whitePen(wxColour(255, 255, 255), 1, wxSOLID);
 469
 470     if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
 471     {
 472         int sashPosition = 0;
 473         if (edge == wxSASH_LEFT)
 474             sashPosition = 0;
 475         else
 476             sashPosition = w - GetEdgeMargin(edge);
 477
 478         dc.SetPen(facePen);
 479         dc.SetBrush(faceBrush);
 480         dc.DrawRectangle(sashPosition, 0, GetEdgeMargin(edge), h);
 481
 482         if (GetWindowStyleFlag() & wxSW_3DSASH)
 483         {
 484             if (edge == wxSASH_LEFT)
 485             {
 486                 // Draw a dark grey line on the left to indicate that the
 487                 // sash is raised
 488                 dc.SetPen(mediumShadowPen);
 489                 dc.DrawLine(GetEdgeMargin(edge), 0, GetEdgeMargin(edge), h);
 490             }
 491             else
 492             {
 493                 // Draw a highlight line on the right to indicate that the
 494                 // sash is raised
 495                 dc.SetPen(hilightPen);
 496                 dc.DrawLine(w - GetEdgeMargin(edge), 0, w - GetEdgeMargin(edge), h);
 497             }
 498         }
 499     }
 500     else // top or bottom
 501     {
 502         int sashPosition = 0;
 503         if (edge == wxSASH_TOP)
 504             sashPosition = 0;
 505         else
 506             sashPosition = h - GetEdgeMargin(edge);
 507
 508         dc.SetPen(facePen);
 509         dc.SetBrush(faceBrush);
 510         dc.DrawRectangle(0, sashPosition, w, GetEdgeMargin(edge));
 511
 512         if (GetWindowStyleFlag() & wxSW_3DSASH)
 513         {
 514             if (edge == wxSASH_BOTTOM)
 515             {
 516                 // Draw a highlight line on the bottom to indicate that the
 517                 // sash is raised
 518                 dc.SetPen(hilightPen);
 519                 dc.DrawLine(0, h - GetEdgeMargin(edge), w, h - GetEdgeMargin(edge));
 520             }
 521             else
 522             {
 523                 // Draw a drak grey line on the top to indicate that the
 524                 // sash is raised
 525                 dc.SetPen(mediumShadowPen);
 526                 dc.DrawLine(1, GetEdgeMargin(edge), w-1, GetEdgeMargin(edge));
 527             }
 528         }
 529     }
 530
 531     dc.SetPen(wxNullPen);
 532     dc.SetBrush(wxNullBrush);
 533 }
 534
 535 // Draw the sash tracker (for whilst moving the sash)
 536 void wxSashWindow::DrawSashTracker(wxSashEdgePosition edge, int x, int y)
 537 {
 538     int w, h;
 539     GetClientSize(&w, &h);
 540
 541     wxScreenDC screenDC;
 542     int x1, y1;
 543     int x2, y2;
 544
 545     if ( edge == wxSASH_LEFT || edge == wxSASH_RIGHT )
 546     {
 547         x1 = x; y1 = 2;
 548         x2 = x; y2 = h-2;
 549
 550         if ( (edge == wxSASH_LEFT) && (x1 > w) )
 551         {
 552             x1 = w; x2 = w;
 553         }
 554         else if ( (edge == wxSASH_RIGHT) && (x1 < 0) )
 555         {
 556             x1 = 0; x2 = 0;
 557         }
 558     }
 559     else
 560     {
 561         x1 = 2; y1 = y;
 562         x2 = w-2; y2 = y;
 563
 564         if ( (edge == wxSASH_TOP) && (y1 > h) )
 565         {
 566             y1 = h;
 567             y2 = h;
 568         }
 569         else if ( (edge == wxSASH_BOTTOM) && (y1 < 0) )
 570         {
 571             y1 = 0;
 572             y2 = 0;
 573         }
 574     }
 575
 576     ClientToScreen(&x1, &y1);
 577     ClientToScreen(&x2, &y2);
 578
 579     wxPen sashTrackerPen(*wxBLACK, 2, wxSOLID);
 580
 581     screenDC.SetLogicalFunction(wxINVERT);
 582     screenDC.SetPen(sashTrackerPen);
 583     screenDC.SetBrush(*wxTRANSPARENT_BRUSH);
 584
 585     screenDC.DrawLine(x1, y1, x2, y2);
 586
 587     screenDC.SetLogicalFunction(wxCOPY);
 588
 589     screenDC.SetPen(wxNullPen);
 590     screenDC.SetBrush(wxNullBrush);
 591 }
 592
 593 // Position and size subwindows.
 594 // Note that the border size applies to each subwindow, not
 595 // including the edges next to the sash.
 596 void wxSashWindow::SizeWindows()
 597 {
 598     int cw, ch;
 599     GetClientSize(&cw, &ch);
 600
 601     if (GetChildren().Number() == 1)
 602     {
 603         wxWindow* child = (wxWindow*) (GetChildren().First()->Data());
 604
 605         int x = 0;
 606         int y = 0;
 607         int width = cw;
 608         int height = ch;
 609
 610         // Top
 611         if (m_sashes[0].m_show)
 612         {
 613             y = m_borderSize;
 614             height -= m_borderSize;
 615         }
 616         y += m_extraBorderSize;
 617
 618         // Left
 619         if (m_sashes[3].m_show)
 620         {
 621             x = m_borderSize;
 622             width -= m_borderSize;
 623         }
 624         x += m_extraBorderSize;
 625
 626         // Right
 627         if (m_sashes[1].m_show)
 628         {
 629             width -= m_borderSize;
 630         }
 631         width -= 2*m_extraBorderSize;
 632
 633         // Bottom
 634         if (m_sashes[2].m_show)
 635         {
 636             height -= m_borderSize;
 637         }
 638         height -= 2*m_extraBorderSize;
 639
 640         child->SetSize(x, y, width, height);
 641     }
 642     else if (GetChildren().Number() > 1)
 643     {
 644         // Perhaps multiple children are themselves sash windows.
 645         // TODO: this doesn't really work because the subwindows sizes/positions
 646         // must be set to leave a gap for the parent's sash (hit-test and decorations).
 647         // Perhaps we can allow for this within LayoutWindow, testing whether the parent
 648         // is a sash window, and if so, allowing some space for the edges.
 649         wxLayoutAlgorithm layout;
 650         layout.LayoutWindow(this);
 651     }
 652
 653     wxClientDC dc(this);
 654     DrawBorders(dc);
 655     DrawSashes(dc);
 656 }
 657
 658 // Initialize colours
 659 void wxSashWindow::InitColours()
 660 {
 661     // Shadow colours
 662 #ifndef __WIN16__
 663     m_faceColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 664     m_mediumShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW);
 665     m_darkShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DDKSHADOW);
 666     m_lightShadowColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT);
 667     m_hilightColour = wxSystemSettings::GetColour(wxSYS_COLOUR_3DHILIGHT);
 668 #else
 669     m_faceColour = *(wxTheColourDatabase->FindColour("LIGHT GREY"));
 670     m_mediumShadowColour = *(wxTheColourDatabase->FindColour("GREY"));
 671     m_darkShadowColour = *(wxTheColourDatabase->FindColour("BLACK"));
 672     m_lightShadowColour = *(wxTheColourDatabase->FindColour("LIGHT GREY"));
 673     m_hilightColour = *(wxTheColourDatabase->FindColour("WHITE"));
 674 #endif
 675 }
 676
 677 void wxSashWindow::SetSashVisible(wxSashEdgePosition edge, bool sash)
 678 {
 679      m_sashes[edge].m_show = sash;
 680      if (sash)
 681         m_sashes[edge].m_margin = m_borderSize;
 682      else
 683         m_sashes[edge].m_margin = 0;
 684 }
 685
 686 #endif // wxUSE_SASH