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