private void disposeCOMInterfaces() { if (iDropSource != null) iDropSource.dispose(); iDropSource = null; if (iDataObject != null) iDataObject.dispose(); iDataObject = null; }
/* QueryInterface([in] riid, [out] ppvObject) * Ownership of ppvObject transfers from callee to caller so reference count on ppvObject * must be incremented before returning. Caller is responsible for releasing ppvObject. */ private int QueryInterface(long /*int*/ riid, long /*int*/ ppvObject) { if (riid == 0 || ppvObject == 0) return COM.E_INVALIDARG; GUID guid = new GUID(); COM.MoveMemory(guid, riid, GUID.sizeof); if (COM.IsEqualGUID(guid, COM.IIDIUnknown) || COM.IsEqualGUID(guid, COM.IIDIDropSource)) { OS.MoveMemory(ppvObject, new long /*int*/[] {iDropSource.getAddress()}, OS.PTR_SIZEOF); AddRef(); return COM.S_OK; } if (COM.IsEqualGUID(guid, COM.IIDIDataObject)) { OS.MoveMemory(ppvObject, new long /*int*/[] {iDataObject.getAddress()}, OS.PTR_SIZEOF); AddRef(); return COM.S_OK; } OS.MoveMemory(ppvObject, new long /*int*/[] {0}, OS.PTR_SIZEOF); return COM.E_NOINTERFACE; }
private void drag(Event dragEvent) { DNDEvent event = new DNDEvent(); event.widget = this; event.x = dragEvent.x; event.y = dragEvent.y; event.time = OS.GetMessageTime(); event.doit = true; notifyListeners(DND.DragStart, event); if (!event.doit || transferAgents == null || transferAgents.length == 0) return; int[] pdwEffect = new int[1]; int operations = opToOs(getStyle()); Display display = control.getDisplay(); String key = "org.eclipse.swt.internal.win32.runMessagesInIdle"; // $NON-NLS-1$ Object oldValue = display.getData(key); display.setData(key, Boolean.TRUE); ImageList imagelist = null; Image image = event.image; hwndDrag = 0; topControl = null; if (image != null) { imagelist = new ImageList(SWT.NONE); imagelist.add(image); topControl = control.getShell(); /* * Bug in Windows. The image is inverted if the shell is RIGHT_TO_LEFT. * The fix is to create a transparent window that covers the shell client * area and use it during the drag to prevent the image from being inverted. * On XP if the shell is RTL, the image is not displayed. */ int offsetX = event.offsetX; hwndDrag = topControl.handle; if ((topControl.getStyle() & SWT.RIGHT_TO_LEFT) != 0) { offsetX = image.getBounds().width - offsetX; RECT rect = new RECT(); OS.GetClientRect(topControl.handle, rect); hwndDrag = OS.CreateWindowEx( OS.WS_EX_TRANSPARENT | OS.WS_EX_NOINHERITLAYOUT, WindowClass, null, OS.WS_CHILD | OS.WS_CLIPSIBLINGS, 0, 0, rect.right - rect.left, rect.bottom - rect.top, topControl.handle, 0, OS.GetModuleHandle(null), null); OS.ShowWindow(hwndDrag, OS.SW_SHOW); } OS.ImageList_BeginDrag(imagelist.getHandle(), 0, offsetX, event.offsetY); /* * Feature in Windows. When ImageList_DragEnter() is called, * it takes a snapshot of the screen If a drag is started * when another window is in front, then the snapshot will * contain part of the other window, causing pixel corruption. * The fix is to force all paints to be delivered before * calling ImageList_DragEnter(). */ if (OS.IsWinCE) { OS.UpdateWindow(topControl.handle); } else { int flags = OS.RDW_UPDATENOW | OS.RDW_ALLCHILDREN; OS.RedrawWindow(topControl.handle, null, 0, flags); } POINT pt = new POINT(); pt.x = dragEvent.x; pt.y = dragEvent.y; OS.MapWindowPoints(control.handle, 0, pt, 1); RECT rect = new RECT(); OS.GetWindowRect(hwndDrag, rect); OS.ImageList_DragEnter(hwndDrag, pt.x - rect.left, pt.y - rect.top); } int result = COM.DRAGDROP_S_CANCEL; try { result = COM.DoDragDrop(iDataObject.getAddress(), iDropSource.getAddress(), operations, pdwEffect); } finally { // ensure that we don't leave transparent window around if (hwndDrag != 0) { OS.ImageList_DragLeave(hwndDrag); OS.ImageList_EndDrag(); imagelist.dispose(); if (hwndDrag != topControl.handle) OS.DestroyWindow(hwndDrag); hwndDrag = 0; topControl = null; } display.setData(key, oldValue); } int operation = osToOp(pdwEffect[0]); if (dataEffect == DND.DROP_MOVE) { operation = (operation == DND.DROP_NONE || operation == DND.DROP_COPY) ? DND.DROP_TARGET_MOVE : DND.DROP_MOVE; } else { if (dataEffect != DND.DROP_NONE) { operation = dataEffect; } } event = new DNDEvent(); event.widget = this; event.time = OS.GetMessageTime(); event.doit = (result == COM.DRAGDROP_S_DROP); event.detail = operation; notifyListeners(DND.DragEnd, event); dataEffect = DND.DROP_NONE; }