| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: dragimag.cpp |
| 3 | // Purpose: wxDragImage sample |
| 4 | // Author: Julian Smart |
| 5 | // Modified by: |
| 6 | // Created: 28/2/2000 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Julian Smart |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // For compilers that support precompilation, includes "wx/wx.h". |
| 13 | #include "wx/wxprec.h" |
| 14 | |
| 15 | #ifdef __BORLANDC__ |
| 16 | #pragma hdrstop |
| 17 | #endif |
| 18 | |
| 19 | #ifndef WX_PRECOMP |
| 20 | #include "wx/wx.h" |
| 21 | #endif |
| 22 | |
| 23 | #include "wx/image.h" |
| 24 | |
| 25 | // Under Windows, change this to 1 |
| 26 | // to use wxGenericDragImage |
| 27 | |
| 28 | #define wxUSE_GENERIC_DRAGIMAGE 1 |
| 29 | |
| 30 | #if wxUSE_GENERIC_DRAGIMAGE |
| 31 | #include "wx/generic/dragimgg.h" |
| 32 | #define wxDragImage wxGenericDragImage |
| 33 | #else |
| 34 | #include "wx/dragimag.h" |
| 35 | #endif |
| 36 | |
| 37 | #include "dragimag.h" |
| 38 | |
| 39 | #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__) |
| 40 | #include "mondrian.xpm" |
| 41 | #include "dragicon.xpm" |
| 42 | #endif |
| 43 | |
| 44 | // main program |
| 45 | |
| 46 | IMPLEMENT_APP(MyApp) |
| 47 | |
| 48 | // MyCanvas |
| 49 | |
| 50 | IMPLEMENT_CLASS(MyCanvas, wxScrolledWindow) |
| 51 | |
| 52 | BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) |
| 53 | EVT_PAINT(MyCanvas::OnPaint) |
| 54 | EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground) |
| 55 | EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent) |
| 56 | END_EVENT_TABLE() |
| 57 | |
| 58 | MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id, |
| 59 | const wxPoint &pos, const wxSize &size ) |
| 60 | : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER ) |
| 61 | { |
| 62 | SetBackgroundColour(* wxWHITE); |
| 63 | |
| 64 | SetCursor(wxCursor(wxCURSOR_ARROW)); |
| 65 | |
| 66 | m_dragMode = TEST_DRAG_NONE; |
| 67 | m_draggedShape = (DragShape*) NULL; |
| 68 | m_dragImage = (wxDragImage*) NULL; |
| 69 | m_currentlyHighlighted = (DragShape*) NULL; |
| 70 | } |
| 71 | |
| 72 | MyCanvas::~MyCanvas() |
| 73 | { |
| 74 | ClearShapes(); |
| 75 | |
| 76 | if (m_dragImage) |
| 77 | delete m_dragImage; |
| 78 | } |
| 79 | |
| 80 | void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) |
| 81 | { |
| 82 | wxPaintDC dc( this ); |
| 83 | PrepareDC( dc ); |
| 84 | |
| 85 | DrawShapes(dc); |
| 86 | } |
| 87 | |
| 88 | void MyCanvas::OnEraseBackground(wxEraseEvent& event) |
| 89 | { |
| 90 | if (wxGetApp().GetBackgroundBitmap().Ok()) |
| 91 | { |
| 92 | wxSize sz = GetClientSize(); |
| 93 | wxRect rect(0, 0, sz.x, sz.y); |
| 94 | |
| 95 | if (event.GetDC()) |
| 96 | { |
| 97 | wxGetApp().TileBitmap(rect, *(event.GetDC()), wxGetApp().GetBackgroundBitmap()); |
| 98 | } |
| 99 | else |
| 100 | { |
| 101 | wxClientDC dc(this); |
| 102 | wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap()); |
| 103 | } |
| 104 | } |
| 105 | else |
| 106 | event.Skip(); // The official way of doing it |
| 107 | } |
| 108 | |
| 109 | void MyCanvas::OnMouseEvent(wxMouseEvent& event) |
| 110 | { |
| 111 | if (event.LeftDown()) |
| 112 | { |
| 113 | DragShape* shape = FindShape(event.GetPosition()); |
| 114 | if (shape) |
| 115 | { |
| 116 | // We tentatively start dragging, but wait for |
| 117 | // mouse movement before dragging properly. |
| 118 | |
| 119 | m_dragMode = TEST_DRAG_START; |
| 120 | m_dragStartPos = event.GetPosition(); |
| 121 | m_draggedShape = shape; |
| 122 | } |
| 123 | } |
| 124 | else if (event.LeftUp() && m_dragMode != TEST_DRAG_NONE) |
| 125 | { |
| 126 | // Finish dragging |
| 127 | |
| 128 | m_dragMode = TEST_DRAG_NONE; |
| 129 | |
| 130 | if (!m_draggedShape || !m_dragImage) |
| 131 | return; |
| 132 | |
| 133 | m_draggedShape->SetPosition(m_draggedShape->GetPosition() |
| 134 | + event.GetPosition() - m_dragStartPos); |
| 135 | |
| 136 | m_dragImage->Hide(); |
| 137 | m_dragImage->EndDrag(); |
| 138 | delete m_dragImage; |
| 139 | m_dragImage = NULL; |
| 140 | |
| 141 | m_draggedShape->SetShow(true); |
| 142 | |
| 143 | m_currentlyHighlighted = (DragShape*) NULL; |
| 144 | |
| 145 | m_draggedShape = (DragShape*) NULL; |
| 146 | |
| 147 | Refresh(true); |
| 148 | } |
| 149 | else if (event.Dragging() && m_dragMode != TEST_DRAG_NONE) |
| 150 | { |
| 151 | if (m_dragMode == TEST_DRAG_START) |
| 152 | { |
| 153 | // We will start dragging if we've moved beyond a couple of pixels |
| 154 | |
| 155 | int tolerance = 2; |
| 156 | int dx = abs(event.GetPosition().x - m_dragStartPos.x); |
| 157 | int dy = abs(event.GetPosition().y - m_dragStartPos.y); |
| 158 | if (dx <= tolerance && dy <= tolerance) |
| 159 | return; |
| 160 | |
| 161 | // Start the drag. |
| 162 | m_dragMode = TEST_DRAG_DRAGGING; |
| 163 | |
| 164 | if (m_dragImage) |
| 165 | delete m_dragImage; |
| 166 | |
| 167 | // Erase the dragged shape from the canvas |
| 168 | m_draggedShape->SetShow(false); |
| 169 | |
| 170 | // redraw immediately |
| 171 | Refresh(true); |
| 172 | Update(); |
| 173 | |
| 174 | switch (m_draggedShape->GetDragMethod()) |
| 175 | { |
| 176 | case SHAPE_DRAG_BITMAP: |
| 177 | { |
| 178 | m_dragImage = new MyDragImage(this, m_draggedShape->GetBitmap(), wxCursor(wxCURSOR_HAND)); |
| 179 | break; |
| 180 | } |
| 181 | case SHAPE_DRAG_TEXT: |
| 182 | { |
| 183 | m_dragImage = new MyDragImage(this, wxString(_T("Dragging some test text")), wxCursor(wxCURSOR_HAND)); |
| 184 | break; |
| 185 | } |
| 186 | case SHAPE_DRAG_ICON: |
| 187 | { |
| 188 | m_dragImage = new MyDragImage(this, wxICON(dragicon), wxCursor(wxCURSOR_HAND)); |
| 189 | break; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | bool fullScreen = wxGetApp().GetUseScreen(); |
| 194 | |
| 195 | // The offset between the top-left of the shape image and the current shape position |
| 196 | wxPoint beginDragHotSpot = m_dragStartPos - m_draggedShape->GetPosition(); |
| 197 | |
| 198 | // Now we do this inside the implementation: always assume |
| 199 | // coordinates relative to the capture window (client coordinates) |
| 200 | |
| 201 | //if (fullScreen) |
| 202 | // beginDragHotSpot -= ClientToScreen(wxPoint(0, 0)); |
| 203 | |
| 204 | if (!m_dragImage->BeginDrag(beginDragHotSpot, this, fullScreen)) |
| 205 | { |
| 206 | delete m_dragImage; |
| 207 | m_dragImage = (wxDragImage*) NULL; |
| 208 | m_dragMode = TEST_DRAG_NONE; |
| 209 | |
| 210 | } else |
| 211 | { |
| 212 | m_dragImage->Move(event.GetPosition()); |
| 213 | m_dragImage->Show(); |
| 214 | } |
| 215 | } |
| 216 | else if (m_dragMode == TEST_DRAG_DRAGGING) |
| 217 | { |
| 218 | // We're currently dragging. See if we're over another shape. |
| 219 | DragShape* onShape = FindShape(event.GetPosition()); |
| 220 | |
| 221 | bool mustUnhighlightOld = false; |
| 222 | bool mustHighlightNew = false; |
| 223 | |
| 224 | if (m_currentlyHighlighted) |
| 225 | { |
| 226 | if ((onShape == (DragShape*) NULL) || (m_currentlyHighlighted != onShape)) |
| 227 | mustUnhighlightOld = true; |
| 228 | } |
| 229 | |
| 230 | if (onShape && (onShape != m_currentlyHighlighted) && onShape->IsShown()) |
| 231 | mustHighlightNew = true; |
| 232 | |
| 233 | if (mustUnhighlightOld || mustHighlightNew) |
| 234 | m_dragImage->Hide(); |
| 235 | |
| 236 | // Now with the drag image switched off, we can change the window contents. |
| 237 | if (mustUnhighlightOld) |
| 238 | m_currentlyHighlighted = (DragShape*) NULL; |
| 239 | |
| 240 | if (mustHighlightNew) |
| 241 | m_currentlyHighlighted = onShape; |
| 242 | |
| 243 | if (mustUnhighlightOld || mustHighlightNew) |
| 244 | { |
| 245 | Refresh(mustUnhighlightOld); |
| 246 | Update(); |
| 247 | } |
| 248 | |
| 249 | // Move and show the image again |
| 250 | m_dragImage->Move(event.GetPosition()); |
| 251 | |
| 252 | if (mustUnhighlightOld || mustHighlightNew) |
| 253 | m_dragImage->Show(); |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | void MyCanvas::DrawShapes(wxDC& dc) |
| 259 | { |
| 260 | wxList::compatibility_iterator node = m_displayList.GetFirst(); |
| 261 | while (node) |
| 262 | { |
| 263 | DragShape* shape = (DragShape*) node->GetData(); |
| 264 | if (shape->IsShown() && m_draggedShape != shape) |
| 265 | { |
| 266 | shape->Draw(dc, (m_currentlyHighlighted == shape)); |
| 267 | } |
| 268 | node = node->GetNext(); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | void MyCanvas::EraseShape(DragShape* shape, wxDC& dc) |
| 273 | { |
| 274 | wxSize sz = GetClientSize(); |
| 275 | wxRect rect(0, 0, sz.x, sz.y); |
| 276 | |
| 277 | wxRect rect2(shape->GetRect()); |
| 278 | dc.SetClippingRegion(rect2.x, rect2.y, rect2.width, rect2.height); |
| 279 | |
| 280 | wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap()); |
| 281 | |
| 282 | dc.DestroyClippingRegion(); |
| 283 | } |
| 284 | |
| 285 | void MyCanvas::ClearShapes() |
| 286 | { |
| 287 | wxList::compatibility_iterator node = m_displayList.GetFirst(); |
| 288 | while (node) |
| 289 | { |
| 290 | DragShape* shape = (DragShape*) node->GetData(); |
| 291 | delete shape; |
| 292 | node = node->GetNext(); |
| 293 | } |
| 294 | m_displayList.Clear(); |
| 295 | } |
| 296 | |
| 297 | DragShape* MyCanvas::FindShape(const wxPoint& pt) const |
| 298 | { |
| 299 | wxList::compatibility_iterator node = m_displayList.GetFirst(); |
| 300 | while (node) |
| 301 | { |
| 302 | DragShape* shape = (DragShape*) node->GetData(); |
| 303 | if (shape->HitTest(pt)) |
| 304 | return shape; |
| 305 | node = node->GetNext(); |
| 306 | } |
| 307 | return (DragShape*) NULL; |
| 308 | } |
| 309 | |
| 310 | // MyFrame |
| 311 | IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame ) |
| 312 | |
| 313 | BEGIN_EVENT_TABLE(MyFrame,wxFrame) |
| 314 | EVT_MENU (wxID_ABOUT, MyFrame::OnAbout) |
| 315 | EVT_MENU (wxID_EXIT, MyFrame::OnQuit) |
| 316 | END_EVENT_TABLE() |
| 317 | |
| 318 | MyFrame::MyFrame() |
| 319 | : wxFrame( (wxFrame *)NULL, wxID_ANY, _T("wxDragImage sample"), |
| 320 | wxPoint(20,20), wxSize(470,360) ) |
| 321 | { |
| 322 | wxMenu *file_menu = new wxMenu(); |
| 323 | file_menu->Append( wxID_ABOUT, _T("&About...")); |
| 324 | file_menu->AppendCheckItem( TEST_USE_SCREEN, _T("&Use whole screen for dragging"), _T("Use whole screen")); |
| 325 | file_menu->Append( wxID_EXIT, _T("E&xit")); |
| 326 | |
| 327 | wxMenuBar *menu_bar = new wxMenuBar(); |
| 328 | menu_bar->Append(file_menu, _T("&File")); |
| 329 | |
| 330 | SetIcon(wxICON(mondrian)); |
| 331 | SetMenuBar( menu_bar ); |
| 332 | |
| 333 | #if wxUSE_STATUSBAR |
| 334 | CreateStatusBar(2); |
| 335 | int widths[] = { -1, 100 }; |
| 336 | SetStatusWidths( 2, widths ); |
| 337 | #endif // wxUSE_STATUSBAR |
| 338 | |
| 339 | m_canvas = new MyCanvas( this, wxID_ANY, wxPoint(0,0), wxSize(10,10) ); |
| 340 | } |
| 341 | |
| 342 | void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) ) |
| 343 | { |
| 344 | Close( true ); |
| 345 | } |
| 346 | |
| 347 | void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) ) |
| 348 | { |
| 349 | (void)wxMessageBox( _T("wxDragImage demo\n") |
| 350 | _T("Julian Smart (c) 2000"), |
| 351 | _T("About wxDragImage Demo"), |
| 352 | wxICON_INFORMATION | wxOK ); |
| 353 | } |
| 354 | |
| 355 | //----------------------------------------------------------------------------- |
| 356 | // MyApp |
| 357 | //----------------------------------------------------------------------------- |
| 358 | |
| 359 | BEGIN_EVENT_TABLE(MyApp, wxApp) |
| 360 | EVT_MENU(TEST_USE_SCREEN, MyApp::OnUseScreen) |
| 361 | END_EVENT_TABLE() |
| 362 | |
| 363 | MyApp::MyApp() |
| 364 | { |
| 365 | // Drag across whole screen |
| 366 | m_useScreen = false; |
| 367 | } |
| 368 | |
| 369 | bool MyApp::OnInit() |
| 370 | { |
| 371 | if ( !wxApp::OnInit() ) |
| 372 | return false; |
| 373 | |
| 374 | #if wxUSE_LIBPNG |
| 375 | wxImage::AddHandler( new wxPNGHandler ); |
| 376 | #endif |
| 377 | |
| 378 | wxImage image; |
| 379 | if (image.LoadFile(_T("backgrnd.png"), wxBITMAP_TYPE_PNG)) |
| 380 | { |
| 381 | m_background = wxBitmap(image); |
| 382 | } |
| 383 | |
| 384 | MyFrame *frame = new MyFrame(); |
| 385 | |
| 386 | wxString rootName(_T("shape0")); |
| 387 | |
| 388 | for (int i = 1; i < 4; i++) |
| 389 | { |
| 390 | /* For some reason under wxX11, the 2nd LoadFile in this loop fails, with |
| 391 | a BadMatch inside CreateFromImage (inside ConvertToBitmap). This happens even if you copy |
| 392 | the first file over the second file. */ |
| 393 | if (image.LoadFile(wxString::Format("%s%d.png", rootName, i), wxBITMAP_TYPE_PNG)) |
| 394 | { |
| 395 | DragShape* newShape = new DragShape(wxBitmap(image)); |
| 396 | newShape->SetPosition(wxPoint(i*50, i*50)); |
| 397 | |
| 398 | if (i == 2) |
| 399 | newShape->SetDragMethod(SHAPE_DRAG_TEXT); |
| 400 | else if (i == 3) |
| 401 | newShape->SetDragMethod(SHAPE_DRAG_ICON); |
| 402 | else |
| 403 | newShape->SetDragMethod(SHAPE_DRAG_BITMAP); |
| 404 | frame->GetCanvas()->GetDisplayList().Append(newShape); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | #if 0 |
| 409 | // Under Motif or GTK, this demonstrates that |
| 410 | // wxScreenDC only gets the root window content. |
| 411 | // We need to be able to copy the overall content |
| 412 | // for full-screen dragging to work. |
| 413 | int w, h; |
| 414 | wxDisplaySize(& w, & h); |
| 415 | wxBitmap bitmap(w, h); |
| 416 | |
| 417 | wxScreenDC dc; |
| 418 | wxMemoryDC memDC; |
| 419 | memDC.SelectObject(bitmap); |
| 420 | memDC.Blit(0, 0, w, h, & dc, 0, 0); |
| 421 | memDC.SelectObject(wxNullBitmap); |
| 422 | m_background = bitmap; |
| 423 | #endif |
| 424 | |
| 425 | frame->Show( true ); |
| 426 | |
| 427 | return true; |
| 428 | } |
| 429 | |
| 430 | int MyApp::OnExit() |
| 431 | { |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | bool MyApp::TileBitmap(const wxRect& rect, wxDC& dc, wxBitmap& bitmap) |
| 436 | { |
| 437 | int w = bitmap.GetWidth(); |
| 438 | int h = bitmap.GetHeight(); |
| 439 | |
| 440 | int i, j; |
| 441 | for (i = rect.x; i < rect.x + rect.width; i += w) |
| 442 | { |
| 443 | for (j = rect.y; j < rect.y + rect.height; j+= h) |
| 444 | dc.DrawBitmap(bitmap, i, j); |
| 445 | } |
| 446 | return true; |
| 447 | } |
| 448 | |
| 449 | void MyApp::OnUseScreen(wxCommandEvent& WXUNUSED(event)) |
| 450 | { |
| 451 | m_useScreen = !m_useScreen; |
| 452 | } |
| 453 | |
| 454 | // DragShape |
| 455 | |
| 456 | DragShape::DragShape(const wxBitmap& bitmap) |
| 457 | { |
| 458 | m_bitmap = bitmap; |
| 459 | m_pos.x = 0; |
| 460 | m_pos.y = 0; |
| 461 | m_dragMethod = SHAPE_DRAG_BITMAP; |
| 462 | m_show = true; |
| 463 | } |
| 464 | |
| 465 | bool DragShape::HitTest(const wxPoint& pt) const |
| 466 | { |
| 467 | wxRect rect(GetRect()); |
| 468 | return rect.Contains(pt.x, pt.y); |
| 469 | } |
| 470 | |
| 471 | bool DragShape::Draw(wxDC& dc, bool highlight) |
| 472 | { |
| 473 | if (m_bitmap.Ok()) |
| 474 | { |
| 475 | wxMemoryDC memDC; |
| 476 | memDC.SelectObject(m_bitmap); |
| 477 | |
| 478 | dc.Blit(m_pos.x, m_pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight(), |
| 479 | & memDC, 0, 0, wxCOPY, true); |
| 480 | |
| 481 | if (highlight) |
| 482 | { |
| 483 | dc.SetPen(*wxWHITE_PEN); |
| 484 | dc.SetBrush(*wxTRANSPARENT_BRUSH); |
| 485 | dc.DrawRectangle(m_pos.x, m_pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight()); |
| 486 | } |
| 487 | |
| 488 | return true; |
| 489 | } |
| 490 | else |
| 491 | return false; |
| 492 | } |
| 493 | |
| 494 | // MyDragImage |
| 495 | |
| 496 | // On some platforms, notably Mac OS X with Core Graphics, we can't blit from |
| 497 | // a window, so we need to draw the background explicitly. |
| 498 | bool MyDragImage::UpdateBackingFromWindow(wxDC& WXUNUSED(windowDC), wxMemoryDC& destDC, const wxRect& WXUNUSED(sourceRect), |
| 499 | const wxRect& destRect) const |
| 500 | { |
| 501 | destDC.SetClippingRegion(destRect); |
| 502 | |
| 503 | if (wxGetApp().GetBackgroundBitmap().Ok()) |
| 504 | wxGetApp().TileBitmap(destRect, destDC, wxGetApp().GetBackgroundBitmap()); |
| 505 | |
| 506 | m_canvas->DrawShapes(destDC); |
| 507 | return true; |
| 508 | } |
| 509 | |