src/generic/dragimgg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/dragimgg.cpp
   3 // Purpose:     Generic wxDragImage implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     29/2/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_DRAGIMAGE
  28
  29 #ifndef WX_PRECOMP
  30     #include <stdio.h>
  31     #include "wx/window.h"
  32     #include "wx/frame.h"
  33     #include "wx/dcclient.h"
  34     #include "wx/dcscreen.h"
  35     #include "wx/dcmemory.h"
  36     #include "wx/settings.h"
  37     #include "wx/intl.h"
  38     #include "wx/log.h"
  39     #include "wx/image.h"
  40 #endif
  41
  42 #define wxUSE_IMAGE_IN_DRAGIMAGE 1
  43
  44 #include "wx/generic/dragimgg.h"
  45
  46 // ----------------------------------------------------------------------------
  47 // macros
  48 // ----------------------------------------------------------------------------
  49
  50 IMPLEMENT_DYNAMIC_CLASS(wxGenericDragImage, wxObject)
  51
  52 // ============================================================================
  53 // implementation
  54 // ============================================================================
  55
  56 // ----------------------------------------------------------------------------
  57 // wxGenericDragImage ctors/dtor
  58 // ----------------------------------------------------------------------------
  59
  60 wxGenericDragImage::~wxGenericDragImage()
  61 {
  62     if (m_windowDC)
  63     {
  64         delete m_windowDC;
  65     }
  66 }
  67
  68 void wxGenericDragImage::Init()
  69 {
  70     m_isDirty = false;
  71     m_isShown = false;
  72     m_windowDC = NULL;
  73     m_window = NULL;
  74     m_fullScreen = false;
  75 #ifdef wxHAS_NATIVE_OVERLAY
  76     m_dcOverlay = NULL;
  77 #else
  78     m_pBackingBitmap = NULL;
  79 #endif
  80 }
  81
  82 #if WXWIN_COMPATIBILITY_2_6
  83 wxGenericDragImage::wxGenericDragImage(const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
  84 {
  85     Init();
  86     Create(cursor);
  87 }
  88
  89 wxGenericDragImage::wxGenericDragImage(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
  90 {
  91     Init();
  92
  93     Create(image, cursor);
  94 }
  95
  96 wxGenericDragImage::wxGenericDragImage(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
  97 {
  98     Init();
  99
 100     Create(image, cursor);
 101 }
 102
 103 wxGenericDragImage::wxGenericDragImage(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 104 {
 105     Init();
 106
 107     Create(str, cursor);
 108 }
 109
 110 bool wxGenericDragImage::Create(const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 111 {
 112     return Create(cursor);
 113 }
 114
 115 bool wxGenericDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 116 {
 117     return Create(image, cursor);
 118 }
 119
 120 bool wxGenericDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 121 {
 122     return Create(image, cursor);
 123 }
 124
 125 bool wxGenericDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 126 {
 127     return Create(str, cursor);
 128 }
 129 #endif // WXWIN_COMPATIBILITY_2_6
 130
 131 // Attributes
 132 ////////////////////////////////////////////////////////////////////////////
 133
 134
 135 // Operations
 136 ////////////////////////////////////////////////////////////////////////////
 137
 138 // Create a drag image with a virtual image (need to override DoDrawImage, GetImageRect)
 139 bool wxGenericDragImage::Create(const wxCursor& cursor)
 140 {
 141     m_cursor = cursor;
 142
 143     return true;
 144 }
 145
 146 // Create a drag image from a bitmap and optional cursor
 147 bool wxGenericDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
 148 {
 149     // We don't have to combine the cursor explicitly since we simply show the cursor
 150     // as we drag. This currently will only work within one window.
 151
 152     m_cursor = cursor;
 153     m_bitmap = image;
 154
 155     return true ;
 156 }
 157
 158 // Create a drag image from an icon and optional cursor
 159 bool wxGenericDragImage::Create(const wxIcon& image, const wxCursor& cursor)
 160 {
 161     // We don't have to combine the cursor explicitly since we simply show the cursor
 162     // as we drag. This currently will only work within one window.
 163
 164     m_cursor = cursor;
 165     m_icon = image;
 166
 167     return true ;
 168 }
 169
 170 // Create a drag image from a string and optional cursor
 171 bool wxGenericDragImage::Create(const wxString& str, const wxCursor& cursor)
 172 {
 173     wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 174
 175     wxCoord w = 0, h = 0;
 176     wxScreenDC dc;
 177     dc.SetFont(font);
 178     dc.GetTextExtent(str, & w, & h);
 179     dc.SetFont(wxNullFont);
 180
 181     wxMemoryDC dc2;
 182
 183     // Sometimes GetTextExtent isn't accurate enough, so make it longer
 184     wxBitmap bitmap((int) ((w+2) * 1.5), (int) h+2);
 185     dc2.SelectObject(bitmap);
 186
 187     dc2.SetFont(font);
 188     dc2.SetBackground(* wxWHITE_BRUSH);
 189     dc2.Clear();
 190     dc2.SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
 191     dc2.SetTextForeground(* wxLIGHT_GREY);
 192     dc2.DrawText(str, 0, 0);
 193     dc2.DrawText(str, 1, 0);
 194     dc2.DrawText(str, 2, 0);
 195     dc2.DrawText(str, 1, 1);
 196     dc2.DrawText(str, 2, 1);
 197     dc2.DrawText(str, 1, 2);
 198     dc2.DrawText(str, 2, 2);
 199
 200     dc2.SetTextForeground(* wxBLACK);
 201     dc2.DrawText(str, 1, 1);
 202
 203     dc2.SelectObject(wxNullBitmap);
 204
 205 #if wxUSE_IMAGE_IN_DRAGIMAGE && (!defined(__WXMSW__) || wxUSE_WXDIB)
 206     // Make the bitmap masked
 207     wxImage image = bitmap.ConvertToImage();
 208     image.SetMaskColour(255, 255, 255);
 209     bitmap = wxBitmap(image);
 210 #endif
 211
 212     return Create(bitmap, cursor);
 213 }
 214
 215 #if wxUSE_TREECTRL
 216 // Create a drag image for the given tree control item
 217 bool wxGenericDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 218 {
 219     wxString str = treeCtrl.GetItemText(id);
 220     return Create(str);
 221 }
 222 #endif
 223
 224 #if wxUSE_LISTCTRL
 225 // Create a drag image for the given list control item
 226 bool wxGenericDragImage::Create(const wxListCtrl& listCtrl, long id)
 227 {
 228     wxString str = listCtrl.GetItemText(id);
 229     return Create(str);
 230 }
 231 #endif
 232
 233 // Begin drag
 234 bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
 235                                    wxWindow* window,
 236                                    bool fullScreen,
 237                                    wxRect* rect)
 238 {
 239     wxCHECK_MSG( window, false, wxT("Window must not be null in BeginDrag."));
 240
 241     // The image should be offset by this amount
 242     m_offset = hotspot;
 243     m_window = window;
 244     m_fullScreen = fullScreen;
 245
 246     if (rect)
 247         m_boundingRect = * rect;
 248
 249     m_isDirty = false;
 250     m_isShown = false;
 251
 252     if (m_cursor.IsOk())
 253     {
 254         m_oldCursor = window->GetCursor();
 255         window->SetCursor(m_cursor);
 256     }
 257
 258     window->CaptureMouse();
 259
 260     // Make a copy of the window so we can repair damage done as the image is
 261     // dragged.
 262
 263     wxSize clientSize;
 264     wxPoint pt;
 265     if (!m_fullScreen)
 266     {
 267         clientSize = window->GetClientSize();
 268         m_boundingRect.x = 0; m_boundingRect.y = 0;
 269         m_boundingRect.width = clientSize.x; m_boundingRect.height = clientSize.y;
 270     }
 271     else
 272     {
 273         int w, h;
 274         wxDisplaySize(& w, & h);
 275         clientSize.x = w; clientSize.y = h;
 276         if (rect)
 277         {
 278             pt.x = m_boundingRect.x; pt.y = m_boundingRect.y;
 279             clientSize.x = m_boundingRect.width; clientSize.y = m_boundingRect.height;
 280         }
 281         else
 282         {
 283             m_boundingRect.x = 0; m_boundingRect.y = 0;
 284             m_boundingRect.width = w; m_boundingRect.height = h;
 285         }
 286     }
 287
 288 #ifndef wxHAS_NATIVE_OVERLAY
 289     wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 290
 291     if (!backing->IsOk() || (backing->GetWidth() < clientSize.x || backing->GetHeight() < clientSize.y))
 292         (*backing) = wxBitmap(clientSize.x, clientSize.y);
 293 #endif // !wxHAS_NATIVE_OVERLAY
 294
 295     if (!m_fullScreen)
 296     {
 297         m_windowDC = new wxClientDC(window);
 298     }
 299     else
 300     {
 301         m_windowDC = new wxScreenDC;
 302
 303 #if 0
 304         // Use m_boundingRect to limit the area considered.
 305         ((wxScreenDC*) m_windowDC)->StartDrawingOnTop(rect);
 306 #endif
 307
 308         m_windowDC->SetClippingRegion(m_boundingRect.x, m_boundingRect.y,
 309             m_boundingRect.width, m_boundingRect.height);
 310     }
 311
 312     return true;
 313 }
 314
 315 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 316 // corner of the image. This is full screen only. fullScreenRect gives the
 317 // position of the window on the screen, to restrict the drag to.
 318 bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 319 {
 320     wxRect rect;
 321
 322     int x = fullScreenRect->GetPosition().x;
 323     int y = fullScreenRect->GetPosition().y;
 324
 325     wxSize sz = fullScreenRect->GetSize();
 326
 327     if (fullScreenRect->GetParent() && !wxDynamicCast(fullScreenRect, wxFrame))
 328         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 329
 330     rect.x = x; rect.y = y;
 331     rect.width = sz.x; rect.height = sz.y;
 332
 333     return BeginDrag(hotspot, window, true, & rect);
 334 }
 335
 336 // End drag
 337 bool wxGenericDragImage::EndDrag()
 338 {
 339     if (m_window)
 340     {
 341 #ifdef __WXMSW__
 342         // Under Windows we can be pretty sure this test will give
 343         // the correct results
 344         if (wxWindow::GetCapture() == m_window)
 345 #endif
 346             m_window->ReleaseMouse();
 347
 348         if (m_cursor.IsOk() && m_oldCursor.IsOk())
 349         {
 350             m_window->SetCursor(m_oldCursor);
 351         }
 352     }
 353
 354     if (m_windowDC)
 355     {
 356 #ifdef wxHAS_NATIVE_OVERLAY
 357         m_overlay.Reset();
 358 #else
 359         m_windowDC->DestroyClippingRegion();
 360 #endif
 361         wxDELETE(m_windowDC);
 362     }
 363
 364 #ifndef wxHAS_NATIVE_OVERLAY
 365     m_repairBitmap = wxNullBitmap;
 366 #endif
 367
 368     return true;
 369 }
 370
 371 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 372 // is non-NULL, or in screen coordinates if NULL.
 373 bool wxGenericDragImage::Move(const wxPoint& pt)
 374 {
 375     wxASSERT_MSG( (m_windowDC != NULL), wxT("No window DC in wxGenericDragImage::Move()") );
 376
 377     wxPoint pt2(pt);
 378     if (m_fullScreen)
 379         pt2 = m_window->ClientToScreen(pt);
 380
 381     // Erase at old position, then show at the current position
 382     wxPoint oldPos = m_position;
 383
 384     bool eraseOldImage = (m_isDirty && m_isShown);
 385
 386     if (m_isShown)
 387         RedrawImage(oldPos - m_offset, pt2 - m_offset, eraseOldImage, true);
 388
 389     m_position = pt2;
 390
 391     if (m_isShown)
 392         m_isDirty = true;
 393
 394     return true;
 395 }
 396
 397 bool wxGenericDragImage::Show()
 398 {
 399     wxASSERT_MSG( (m_windowDC != NULL), wxT("No window DC in wxGenericDragImage::Show()") );
 400
 401     // Show at the current position
 402
 403     if (!m_isShown)
 404     {
 405         // This is where we restore the backing bitmap, in case
 406         // something has changed on the window.
 407
 408 #ifndef wxHAS_NATIVE_OVERLAY
 409         wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 410         wxMemoryDC memDC;
 411         memDC.SelectObject(* backing);
 412
 413         UpdateBackingFromWindow(* m_windowDC, memDC, m_boundingRect, wxRect(0, 0, m_boundingRect.width, m_boundingRect.height));
 414
 415         //memDC.Blit(0, 0, m_boundingRect.width, m_boundingRect.height, m_windowDC, m_boundingRect.x, m_boundingRect.y);
 416         memDC.SelectObject(wxNullBitmap);
 417 #endif // !wxHAS_NATIVE_OVERLAY
 418
 419         RedrawImage(m_position - m_offset, m_position - m_offset, false, true);
 420     }
 421
 422     m_isShown = true;
 423     m_isDirty = true;
 424
 425     return true;
 426 }
 427
 428 bool wxGenericDragImage::UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
 429     const wxRect& sourceRect, const wxRect& destRect) const
 430 {
 431     return destDC.Blit(destRect.x, destRect.y, destRect.width, destRect.height, & windowDC,
 432         sourceRect.x, sourceRect.y);
 433 }
 434
 435 bool wxGenericDragImage::Hide()
 436 {
 437     wxASSERT_MSG( (m_windowDC != NULL), wxT("No window DC in wxGenericDragImage::Hide()") );
 438
 439     // Repair the old position
 440
 441     if (m_isShown && m_isDirty)
 442     {
 443         RedrawImage(m_position - m_offset, m_position - m_offset, true, false);
 444     }
 445
 446     m_isShown = false;
 447     m_isDirty = false;
 448
 449     return true;
 450 }
 451
 452 // More efficient: erase and redraw simultaneously if possible
 453 bool wxGenericDragImage::RedrawImage(const wxPoint& oldPos,
 454                                      const wxPoint& newPos,
 455                                      bool eraseOld, bool drawNew)
 456 {
 457     if (!m_windowDC)
 458         return false;
 459
 460 #ifdef wxHAS_NATIVE_OVERLAY
 461     wxUnusedVar(oldPos);
 462
 463     wxDCOverlay dcoverlay( m_overlay, (wxWindowDC*) m_windowDC ) ;
 464     if ( eraseOld )
 465         dcoverlay.Clear() ;
 466     if (drawNew)
 467         DoDrawImage(*m_windowDC, newPos);
 468 #else // !wxHAS_NATIVE_OVERLAY
 469     wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 470     if (!backing->IsOk())
 471         return false;
 472
 473     wxRect oldRect(GetImageRect(oldPos));
 474     wxRect newRect(GetImageRect(newPos));
 475
 476     wxRect fullRect;
 477
 478     // Full rect: the combination of both rects
 479     if (eraseOld && drawNew)
 480     {
 481         int oldRight = oldRect.GetRight();
 482         int oldBottom = oldRect.GetBottom();
 483         int newRight = newRect.GetRight();
 484         int newBottom = newRect.GetBottom();
 485
 486         wxPoint topLeft = wxPoint(wxMin(oldPos.x, newPos.x), wxMin(oldPos.y, newPos.y));
 487         wxPoint bottomRight = wxPoint(wxMax(oldRight, newRight), wxMax(oldBottom, newBottom));
 488
 489         fullRect.x = topLeft.x; fullRect.y = topLeft.y;
 490         fullRect.SetRight(bottomRight.x);
 491         fullRect.SetBottom(bottomRight.y);
 492     }
 493     else if (eraseOld)
 494         fullRect = oldRect;
 495     else if (drawNew)
 496         fullRect = newRect;
 497
 498     // Make the bitmap bigger than it need be, so we don't
 499     // keep reallocating all the time.
 500     int excess = 50;
 501
 502     if (!m_repairBitmap.IsOk() || (m_repairBitmap.GetWidth() < fullRect.GetWidth() || m_repairBitmap.GetHeight() < fullRect.GetHeight()))
 503     {
 504         m_repairBitmap = wxBitmap(fullRect.GetWidth() + excess, fullRect.GetHeight() + excess);
 505     }
 506
 507     wxMemoryDC memDC;
 508     memDC.SelectObject(* backing);
 509
 510     wxMemoryDC memDCTemp;
 511     memDCTemp.SelectObject(m_repairBitmap);
 512
 513     // Draw the backing bitmap onto the repair bitmap.
 514     // If full-screen, we may have specified the rect on the
 515     // screen that we're using for our backing bitmap.
 516     // So subtract this when we're blitting from the backing bitmap
 517     // (translate from screen to backing-bitmap coords).
 518
 519     memDCTemp.Blit(0, 0, fullRect.GetWidth(), fullRect.GetHeight(), & memDC, fullRect.x - m_boundingRect.x, fullRect.y - m_boundingRect.y);
 520
 521     // If drawing, draw the image onto the mem DC
 522     if (drawNew)
 523     {
 524         wxPoint pos(newPos.x - fullRect.x, newPos.y - fullRect.y) ;
 525         DoDrawImage(memDCTemp, pos);
 526     }
 527
 528     // Now blit to the window
 529     // Finally, blit the temp mem DC to the window.
 530     m_windowDC->Blit(fullRect.x, fullRect.y, fullRect.width, fullRect.height, & memDCTemp, 0, 0);
 531
 532     memDCTemp.SelectObject(wxNullBitmap);
 533     memDC.SelectObject(wxNullBitmap);
 534 #endif // wxHAS_NATIVE_OVERLAY/!wxHAS_NATIVE_OVERLAY
 535
 536     return true;
 537 }
 538
 539 // Override this if you are using a virtual image (drawing your own image)
 540 bool wxGenericDragImage::DoDrawImage(wxDC& dc, const wxPoint& pos) const
 541 {
 542     if (m_bitmap.IsOk())
 543     {
 544         dc.DrawBitmap(m_bitmap, pos.x, pos.y, (m_bitmap.GetMask() != 0));
 545         return true;
 546     }
 547     else if (m_icon.IsOk())
 548     {
 549         dc.DrawIcon(m_icon, pos.x, pos.y);
 550         return true;
 551     }
 552     else
 553         return false;
 554 }
 555
 556 // Override this if you are using a virtual image (drawing your own image)
 557 wxRect wxGenericDragImage::GetImageRect(const wxPoint& pos) const
 558 {
 559     if (m_bitmap.IsOk())
 560     {
 561         return wxRect(pos.x, pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
 562     }
 563     else if (m_icon.IsOk())
 564     {
 565         return wxRect(pos.x, pos.y, m_icon.GetWidth(), m_icon.GetHeight());
 566     }
 567     else
 568     {
 569         return wxRect(pos.x, pos.y, 0, 0);
 570     }
 571 }
 572
 573 #endif // wxUSE_DRAGIMAGE