Mercurial > projects > dwt-win
view dwt/dnd/TreeDragSourceEffect.d @ 213:36f5cb12e1a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 17 May 2008 17:34:28 +0200 |
parents | 3afcd4ddcf90 |
children | fd9c62a2998e |
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/******************************************************************************* * Copyright (c) 2007 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.dnd.TreeDragSourceEffect; import dwt.DWT; import dwt.graphics.Image; import dwt.graphics.ImageData; import dwt.graphics.PaletteData; import dwt.graphics.Rectangle; import dwt.internal.win32.OS; import dwt.widgets.Display; import dwt.widgets.Tree; import dwt.widgets.TreeItem; import dwt.dnd.DragSourceEffect; import dwt.dnd.DragSourceEvent; import dwt.dwthelper.utils; /** * This class provides default implementations to display a source image * when a drag is initiated from a <code>Tree</code>. * * <p>Classes that wish to provide their own source image for a <code>Tree</code> can * extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code> * method and set the field <code>DragSourceEvent.image</code> with their own image.</p> * * Subclasses that override any methods of this class must call the corresponding * <code>super</code> method to get the default drag under effect implementation. * * @see DragSourceEffect * @see DragSourceEvent * * @since 3.3 */ public class TreeDragSourceEffect : DragSourceEffect { Image dragSourceImage = null; /** * Creates a new <code>TreeDragSourceEffect</code> to handle drag effect * from the specified <code>Tree</code>. * * @param tree the <code>Tree</code> that the user clicks on to initiate the drag */ public this(Tree tree) { super(tree); } /** * This implementation of <code>dragFinished</code> disposes the image * that was created in <code>TreeDragSourceEffect.dragStart</code>. * * Subclasses that override this method should call <code>super.dragFinished(event)</code> * to dispose the image in the default implementation. * * @param event the information associated with the drag finished event */ public void dragFinished(DragSourceEvent event) { if (dragSourceImage !is null) dragSourceImage.dispose(); dragSourceImage = null; } /** * This implementation of <code>dragStart</code> will create a default * image that will be used during the drag. The image should be disposed * when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code> * method. * * Subclasses that override this method should call <code>super.dragStart(event)</code> * to use the image from the default implementation. * * @param event the information associated with the drag start event */ public void dragStart(DragSourceEvent event) { event.image = getDragSourceImage(event); } Image getDragSourceImage(DragSourceEvent event) { if (dragSourceImage !is null) dragSourceImage.dispose(); dragSourceImage = null; if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (5, 1)) { SHDRAGIMAGE shdi; int DI_GETDRAGIMAGE = OS.RegisterWindowMessage ("ShellGetDragImage"w.ptr); //$NON-NLS-1$ if (OS.SendMessage (control.handle, DI_GETDRAGIMAGE, 0, &shdi) !is 0) { event.x += shdi.ptOffset.x; event.y += shdi.ptOffset.y; auto hImage = shdi.hbmpDragImage; if (hImage !is null) { BITMAP bm; OS.GetObject (hImage, BITMAP.sizeof, &bm); int srcWidth = bm.bmWidth; int srcHeight = bm.bmHeight; /* Create resources */ auto hdc = OS.GetDC (null); auto srcHdc = OS.CreateCompatibleDC (hdc); auto oldSrcBitmap = OS.SelectObject (srcHdc, hImage); auto memHdc = OS.CreateCompatibleDC (hdc); BITMAPINFOHEADER bmiHeader; bmiHeader.biSize = BITMAPINFOHEADER.sizeof; bmiHeader.biWidth = srcWidth; bmiHeader.biHeight = -srcHeight; bmiHeader.biPlanes = 1; bmiHeader.biBitCount = 32; bmiHeader.biCompression = OS.BI_RGB; void* pBits; auto memDib = OS.CreateDIBSection (null, cast(BITMAPINFO*)&bmiHeader, OS.DIB_RGB_COLORS, &pBits, null, 0); if (memDib is null) DWT.error (DWT.ERROR_NO_HANDLES); auto oldMemBitmap = OS.SelectObject (memHdc, memDib); BITMAP dibBM; OS.GetObject (memDib, BITMAP.sizeof, &dibBM); int sizeInBytes = dibBM.bmWidthBytes * dibBM.bmHeight; /* Get the foreground pixels */ OS.BitBlt (memHdc, 0, 0, srcWidth, srcHeight, srcHdc, 0, 0, OS.SRCCOPY); byte[] srcData = (cast(byte*)dibBM.bmBits)[ 0 .. sizeInBytes ]; PaletteData palette = new PaletteData(0xFF00, 0xFF0000, 0xFF000000); ImageData data = new ImageData(srcWidth, srcHeight, bm.bmBitsPixel, palette, bm.bmWidthBytes, srcData); data.transparentPixel = shdi.crColorKey << 8; dragSourceImage = new Image (control.getDisplay (), data); OS.SelectObject (memHdc, oldMemBitmap); OS.DeleteDC (memHdc); OS.DeleteObject (memDib); OS.SelectObject (srcHdc, oldSrcBitmap); OS.DeleteDC (srcHdc); OS.ReleaseDC (null, hdc); return dragSourceImage; } } return null; } Tree tree = cast(Tree) control; //TEMPORARY CODE if (tree.isListening (DWT.EraseItem) || tree.isListening (DWT.PaintItem)) return null; TreeItem[] selection = tree.getSelection(); if (selection.length is 0) return null; auto treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0); if (treeImageList !is 0) { int count = Math.min(selection.length, 10); Rectangle bounds = selection[0].getBounds(0); for (int i = 1; i < count; i++) { bounds = bounds.makeUnion(selection[i].getBounds(0)); } auto hDC = OS.GetDC(tree.handle); auto hDC1 = OS.CreateCompatibleDC(hDC); auto bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height); auto hOldBitmap = OS.SelectObject(hDC1, bitmap); RECT rect; rect.right = bounds.width; rect.bottom = bounds.height; auto hBrush = OS.GetStockObject(OS.WHITE_BRUSH); OS.FillRect(hDC1, &rect, hBrush); for (int i = 0; i < count; i++) { TreeItem selected = selection[i]; Rectangle cell = selected.getBounds(0); HANDLE imageList = cast(HANDLE) OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle); OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED); OS.ImageList_Destroy(imageList); } OS.SelectObject(hDC1, hOldBitmap); OS.DeleteDC (hDC1); OS.ReleaseDC (tree.handle, hDC); Display display = tree.getDisplay(); dragSourceImage = Image.win32_new(display, DWT.BITMAP, bitmap); return dragSourceImage; } return null; } }