src/generic/dragimgg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  21 #pragma implementation "dragimgg.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_DRAGIMAGE
  32
  33 #ifndef WX_PRECOMP
  34 #include <stdio.h>
  35 #include "wx/setup.h"
  36 #include "wx/window.h"
  37 #include "wx/frame.h"
  38 #include "wx/dcclient.h"
  39 #include "wx/dcscreen.h"
  40 #include "wx/dcmemory.h"
  41 #include "wx/settings.h"
  42 #endif
  43
  44 #include "wx/log.h"
  45 #include "wx/intl.h"
  46
  47 #ifdef __WIN16__
  48 #define wxUSE_IMAGE_IN_DRAGIMAGE 0
  49 #else
  50 #define wxUSE_IMAGE_IN_DRAGIMAGE 1
  51 #endif
  52
  53 #if wxUSE_IMAGE_IN_DRAGIMAGE
  54 #include "wx/image.h"
  55 #endif
  56
  57 #include "wx/generic/dragimgg.h"
  58
  59 // ----------------------------------------------------------------------------
  60 // macros
  61 // ----------------------------------------------------------------------------
  62
  63 IMPLEMENT_DYNAMIC_CLASS(wxGenericDragImage, wxObject)
  64
  65 // ============================================================================
  66 // implementation
  67 // ============================================================================
  68
  69 // ----------------------------------------------------------------------------
  70 // wxGenericDragImage ctors/dtor
  71 // ----------------------------------------------------------------------------
  72
  73 wxGenericDragImage::~wxGenericDragImage()
  74 {
  75     if (m_windowDC)
  76     {
  77         delete m_windowDC;
  78     }
  79 }
  80
  81 void wxGenericDragImage::Init()
  82 {
  83     m_isDirty = FALSE;
  84     m_isShown = FALSE;
  85     m_windowDC = (wxDC*) NULL;
  86     m_window = (wxWindow*) NULL;
  87     m_fullScreen = FALSE;
  88     m_pBackingBitmap = (wxBitmap*) NULL;
  89 }
  90
  91 // Attributes
  92 ////////////////////////////////////////////////////////////////////////////
  93
  94
  95 // Operations
  96 ////////////////////////////////////////////////////////////////////////////
  97
  98 // Create a drag image with a virtual image (need to override DoDrawImage, GetImageRect)
  99 bool wxGenericDragImage::Create(const wxCursor& cursor)
 100 {
 101     m_cursor = cursor;
 102
 103     return TRUE;
 104 }
 105
 106 // Create a drag image from a bitmap and optional cursor
 107 bool wxGenericDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
 108 {
 109     // We don't have to combine the cursor explicitly since we simply show the cursor
 110     // as we drag. This currently will only work within one window.
 111
 112     m_cursor = cursor;
 113     m_bitmap = image;
 114
 115     return TRUE ;
 116 }
 117
 118 // Create a drag image from an icon and optional cursor
 119 bool wxGenericDragImage::Create(const wxIcon& image, const wxCursor& cursor)
 120 {
 121     // We don't have to combine the cursor explicitly since we simply show the cursor
 122     // as we drag. This currently will only work within one window.
 123
 124     m_cursor = cursor;
 125     m_icon = image;
 126
 127     return TRUE ;
 128 }
 129
 130 // Create a drag image from a string and optional cursor
 131 bool wxGenericDragImage::Create(const wxString& str, const wxCursor& cursor)
 132 {
 133     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 134
 135     long w, h;
 136     wxScreenDC dc;
 137     dc.SetFont(font);
 138     dc.GetTextExtent(str, & w, & h);
 139     dc.SetFont(wxNullFont);
 140
 141     wxMemoryDC dc2;
 142     dc2.SetFont(font);
 143
 144     // Sometimes GetTextExtent isn't accurate enough, so make it longer
 145     wxBitmap bitmap((int) ((w+2) * 1.5), (int) h+2);
 146     dc2.SelectObject(bitmap);
 147
 148     dc2.SetBackground(* wxWHITE_BRUSH);
 149     dc2.Clear();
 150     dc2.SetBackgroundMode(wxTRANSPARENT);
 151     dc2.SetTextForeground(* wxLIGHT_GREY);
 152     dc2.DrawText(str, 0, 0);
 153     dc2.DrawText(str, 1, 0);
 154     dc2.DrawText(str, 2, 0);
 155     dc2.DrawText(str, 1, 1);
 156     dc2.DrawText(str, 2, 1);
 157     dc2.DrawText(str, 1, 2);
 158     dc2.DrawText(str, 2, 2);
 159
 160     dc2.SetTextForeground(* wxBLACK);
 161     dc2.DrawText(str, 1, 1);
 162
 163     dc2.SelectObject(wxNullBitmap);
 164
 165 #if wxUSE_IMAGE_IN_DRAGIMAGE
 166     // Make the bitmap masked
 167     wxImage image(bitmap);
 168     image.SetMaskColour(255, 255, 255);
 169     bitmap = image.ConvertToBitmap();
 170 #endif
 171
 172     return Create(bitmap, cursor);
 173 }
 174
 175 // Create a drag image for the given tree control item
 176 bool wxGenericDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 177 {
 178     wxString str = treeCtrl.GetItemText(id);
 179     return Create(str);
 180 }
 181
 182 // Create a drag image for the given list control item
 183 bool wxGenericDragImage::Create(const wxListCtrl& listCtrl, long id)
 184 {
 185     wxString str = listCtrl.GetItemText(id);
 186     return Create(str);
 187 }
 188
 189 // Begin drag
 190 bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
 191                                    wxWindow* window,
 192                                    bool fullScreen,
 193                                    wxRect* rect)
 194 {
 195     wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
 196
 197     // The image should be offset by this amount
 198     m_offset = hotspot;
 199     m_window = window;
 200     m_fullScreen = fullScreen;
 201
 202     if (rect)
 203         m_boundingRect = * rect;
 204
 205     m_isDirty = FALSE;
 206     m_isDirty = FALSE;
 207
 208     if (window)
 209     {
 210         window->CaptureMouse();
 211
 212         if (m_cursor.Ok())
 213         {
 214             m_oldCursor = window->GetCursor();
 215             window->SetCursor(m_cursor);
 216         }
 217     }
 218
 219     // Make a copy of the window so we can repair damage done as the image is
 220     // dragged.
 221
 222     wxSize clientSize;
 223     wxPoint pt(0, 0);
 224     if (!m_fullScreen)
 225     {
 226         clientSize = window->GetClientSize();
 227         m_boundingRect.x = 0; m_boundingRect.y = 0;
 228         m_boundingRect.width = clientSize.x; m_boundingRect.height = clientSize.y;
 229     }
 230     else
 231     {
 232         int w, h;
 233         wxDisplaySize(& w, & h);
 234         clientSize.x = w; clientSize.y = h;
 235         if (rect)
 236         {
 237             pt.x = m_boundingRect.x; pt.y = m_boundingRect.y;
 238             clientSize.x = m_boundingRect.width; clientSize.y = m_boundingRect.height;
 239         }
 240         else
 241         {
 242             m_boundingRect.x = 0; m_boundingRect.y = 0;
 243             m_boundingRect.width = w; m_boundingRect.height = h;
 244         }
 245     }
 246
 247     wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 248
 249     if (!backing->Ok() || (backing->GetWidth() < clientSize.x || backing->GetHeight() < clientSize.y))
 250         (*backing) = wxBitmap(clientSize.x, clientSize.y);
 251
 252     if (!m_fullScreen)
 253         m_windowDC = new wxClientDC(window);
 254     else
 255     {
 256         m_windowDC = new wxScreenDC;
 257
 258 #if 0
 259         // Use m_boundingRect to limit the area considered.
 260         ((wxScreenDC*) m_windowDC)->StartDrawingOnTop(rect);
 261 #endif
 262
 263         m_windowDC->SetClippingRegion(m_boundingRect.x, m_boundingRect.y,
 264             m_boundingRect.width, m_boundingRect.height);
 265     }
 266
 267     return TRUE;
 268 }
 269
 270 // Begin drag. hotspot is the location of the drag position relative to the upper-left
 271 // corner of the image. This is full screen only. fullScreenRect gives the
 272 // position of the window on the screen, to restrict the drag to.
 273 bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
 274 {
 275     wxRect rect;
 276
 277     int x = fullScreenRect->GetPosition().x;
 278     int y = fullScreenRect->GetPosition().y;
 279
 280     wxSize sz = fullScreenRect->GetSize();
 281
 282     if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
 283         fullScreenRect->GetParent()->ClientToScreen(& x, & y);
 284
 285     rect.x = x; rect.y = y;
 286     rect.width = sz.x; rect.height = sz.y;
 287
 288     return BeginDrag(hotspot, window, TRUE, & rect);
 289 }
 290
 291 // End drag
 292 bool wxGenericDragImage::EndDrag()
 293 {
 294     if (m_window)
 295     {
 296         m_window->ReleaseMouse();
 297         if (m_cursor.Ok() && m_oldCursor.Ok())
 298         {
 299             m_window->SetCursor(m_oldCursor);
 300         }
 301     }
 302
 303     if (m_windowDC)
 304     {
 305         m_windowDC->DestroyClippingRegion();
 306         delete m_windowDC;
 307         m_windowDC = (wxDC*) NULL;
 308     }
 309
 310     m_repairBitmap = wxNullBitmap;
 311
 312     return TRUE;
 313 }
 314
 315 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 316 // is non-NULL, or in screen coordinates if NULL.
 317 bool wxGenericDragImage::Move(const wxPoint& pt)
 318 {
 319     wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Move()") );
 320
 321     wxPoint pt2(pt);
 322     if (m_fullScreen)
 323         pt2 = m_window->ClientToScreen(pt);
 324
 325     // Erase at old position, then show at the current position
 326     wxPoint oldPos = m_position;
 327
 328     bool eraseOldImage = (m_isDirty && m_isShown);
 329
 330     if (m_isShown)
 331         RedrawImage(oldPos - m_offset, pt2 - m_offset, eraseOldImage, TRUE);
 332
 333     m_position = pt2;
 334
 335     if (m_isShown)
 336         m_isDirty = TRUE;
 337
 338     return TRUE;
 339 }
 340
 341 bool wxGenericDragImage::Show()
 342 {
 343     wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Show()") );
 344
 345     // Show at the current position
 346
 347     if (!m_isShown)
 348     {
 349         // This is where we restore the backing bitmap, in case
 350         // something has changed on the window.
 351
 352         wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 353         wxMemoryDC memDC;
 354         memDC.SelectObject(* backing);
 355
 356         UpdateBackingFromWindow(* m_windowDC, memDC, m_boundingRect, wxRect(0, 0, m_boundingRect.width, m_boundingRect.height));
 357
 358         //memDC.Blit(0, 0, m_boundingRect.width, m_boundingRect.height, m_windowDC, m_boundingRect.x, m_boundingRect.y);
 359         memDC.SelectObject(wxNullBitmap);
 360
 361         RedrawImage(m_position - m_offset, m_position - m_offset, FALSE, TRUE);
 362     }
 363
 364     m_isShown = TRUE;
 365     m_isDirty = TRUE;
 366
 367     return TRUE;
 368 }
 369
 370 bool wxGenericDragImage::UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
 371     const wxRect& sourceRect, const wxRect& destRect) const
 372 {
 373     return destDC.Blit(destRect.x, destRect.y, destRect.width, destRect.height, & windowDC, sourceRect.x, sourceRect.y);
 374 }
 375
 376 bool wxGenericDragImage::Hide()
 377 {
 378     wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Hide()") );
 379
 380     // Repair the old position
 381
 382     if (m_isShown && m_isDirty)
 383     {
 384         RedrawImage(m_position - m_offset, m_position - m_offset, TRUE, FALSE);
 385     }
 386
 387     m_isShown = FALSE;
 388     m_isDirty = FALSE;
 389
 390     return TRUE;
 391 }
 392
 393 // More efficient: erase and redraw simultaneously if possible
 394 bool wxGenericDragImage::RedrawImage(const wxPoint& oldPos, const wxPoint& newPos,
 395                                      bool eraseOld, bool drawNew)
 396 {
 397     if (!m_windowDC)
 398         return FALSE;
 399
 400     wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
 401     if (!backing->Ok())
 402         return FALSE;
 403
 404     wxRect oldRect(GetImageRect(oldPos));
 405     wxRect newRect(GetImageRect(newPos));
 406
 407     wxRect fullRect;
 408
 409     // Full rect: the combination of both rects
 410     if (eraseOld && drawNew)
 411     {
 412         int oldRight = oldRect.GetRight();
 413         int oldBottom = oldRect.GetBottom();
 414         int newRight = newRect.GetRight();
 415         int newBottom = newRect.GetBottom();
 416
 417         wxPoint topLeft = wxPoint(wxMin(oldPos.x, newPos.x), wxMin(oldPos.y, newPos.y));
 418         wxPoint bottomRight = wxPoint(wxMax(oldRight, newRight), wxMax(oldBottom, newBottom));
 419
 420         fullRect.x = topLeft.x; fullRect.y = topLeft.y;
 421         fullRect.SetRight(bottomRight.x);
 422         fullRect.SetBottom(bottomRight.y);
 423     }
 424     else if (eraseOld)
 425         fullRect = oldRect;
 426     else if (drawNew)
 427         fullRect = newRect;
 428
 429     // Make the bitmap bigger than it need be, so we don't
 430     // keep reallocating all the time.
 431     int excess = 50;
 432
 433     if (!m_repairBitmap.Ok() || (m_repairBitmap.GetWidth() < fullRect.GetWidth() || m_repairBitmap.GetHeight() < fullRect.GetHeight()))
 434     {
 435         m_repairBitmap = wxBitmap(fullRect.GetWidth() + excess, fullRect.GetHeight() + excess);
 436     }
 437
 438     wxMemoryDC memDC;
 439     memDC.SelectObject(* backing);
 440
 441     wxMemoryDC memDCTemp;
 442     memDCTemp.SelectObject(m_repairBitmap);
 443
 444     // Draw the backing bitmap onto the repair bitmap.
 445     // If full-screen, we may have specified the rect on the
 446     // screen that we're using for our backing bitmap.
 447     // So subtract this when we're blitting from the backing bitmap
 448     // (translate from screen to backing-bitmap coords).
 449
 450     memDCTemp.Blit(0, 0, fullRect.GetWidth(), fullRect.GetHeight(), & memDC, fullRect.x - m_boundingRect.x, fullRect.y - m_boundingRect.y);
 451
 452     // If drawing, draw the image onto the mem DC
 453     if (drawNew)
 454     {
 455         wxPoint pos(newPos.x - fullRect.x, newPos.y - fullRect.y) ;
 456         DoDrawImage(memDCTemp, pos);
 457     }
 458
 459     // Now blit to the window
 460     // Finally, blit the temp mem DC to the window.
 461     m_windowDC->Blit(fullRect.x, fullRect.y, fullRect.width, fullRect.height, & memDCTemp, 0, 0);
 462
 463     memDCTemp.SelectObject(wxNullBitmap);
 464     memDC.SelectObject(wxNullBitmap);
 465
 466     return TRUE;
 467 }
 468
 469 // Override this if you are using a virtual image (drawing your own image)
 470 bool wxGenericDragImage::DoDrawImage(wxDC& dc, const wxPoint& pos) const
 471 {
 472     if (m_bitmap.Ok())
 473     {
 474         dc.DrawBitmap(m_bitmap, pos.x, pos.y, (m_bitmap.GetMask() != 0));
 475         return TRUE;
 476     }
 477     else if (m_icon.Ok())
 478     {
 479         dc.DrawIcon(m_icon, pos.x, pos.y);
 480         return TRUE;
 481     }
 482     else
 483         return FALSE;
 484 }
 485
 486 // Override this if you are using a virtual image (drawing your own image)
 487 wxRect wxGenericDragImage::GetImageRect(const wxPoint& pos) const
 488 {
 489     if (m_bitmap.Ok())
 490     {
 491         return wxRect(pos.x, pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
 492     }
 493     else if (m_icon.Ok())
 494     {
 495         return wxRect(pos.x, pos.y, m_icon.GetWidth(), m_icon.GetHeight());
 496     }
 497     else
 498     {
 499         return wxRect(pos.x, pos.y, 0, 0);
 500     }
 501 }
 502
 503 #endif // wxUSE_DRAGIMAGE