Mercurial > projects > dwt-linux
view dwt/dnd/TableDragSourceEffect.d @ 240:ce446666f5a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 12 May 2008 19:13:01 +0200 |
parents | f2e04420fd6c |
children | c0d810de7093 |
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/******************************************************************************* * Copyright (c) 2000, 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.TableDragSourceEffect; import dwt.DWT; import dwt.graphics.Image; import dwt.internal.gtk.OS; import dwt.widgets.Display; import dwt.widgets.Table; import dwt.dnd.DragSourceEffect; import dwt.dnd.DragSourceEvent; import Math = tango.math.Math; /** * This class provides default implementations to display a source image * when a drag is initiated from a <code>Table</code>. * * <p>Classes that wish to provide their own source image for a <code>Table</code> can * extend the <code>TableDragSourceEffect</code> class, override the * <code>TableDragSourceEffect.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 source effect implementation. * * @see DragSourceEffect * @see DragSourceEvent * * @since 3.3 */ public class TableDragSourceEffect : DragSourceEffect { Image dragSourceImage = null; /** * Creates a new <code>TableDragSourceEffect</code> to handle drag effect * from the specified <code>Table</code>. * * @param table the <code>Table</code> that the user clicks on to initiate the drag */ public this(Table table) { super(table); } /** * This implementation of <code>dragFinished</code> disposes the image * that was created in <code>TableDragSourceEffect.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 override 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>TableDragSourceEffect.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 override void dragStart(DragSourceEvent event) { event.image = getDragSourceImage(event); } Image getDragSourceImage(DragSourceEvent event) { if (dragSourceImage !is null) dragSourceImage.dispose(); dragSourceImage = null; Table table = cast(Table) control; if (OS.GTK_VERSION < OS.buildVERSION (2, 2, 0)) return null; //TEMPORARY CODE if (table.isListening(DWT.EraseItem) || table.isListening (DWT.PaintItem)) return null; /* * Bug in GTK. gtk_tree_selection_get_selected_rows() segmentation faults * in versions smaller than 2.2.4 if the model is NULL. The fix is * to give a valid pointer instead. */ auto handle = table.handle; auto selection = OS.gtk_tree_view_get_selection (handle); int dummy; void* model = OS.GTK_VERSION < OS.buildVERSION (2, 2, 4) ? &dummy : null; auto list = OS.gtk_tree_selection_get_selected_rows (selection, &model); if (list is null) return null; int count = Math.min(10, OS.g_list_length (list)); Display display = table.getDisplay(); if (count is 1) { auto path = OS.g_list_nth_data (list, 0); auto pixmap = OS.gtk_tree_view_create_row_drag_icon(handle, path); dragSourceImage = Image.gtk_new(display, DWT.ICON, pixmap, null); } else { int width = 0, height = 0; int w, h; int[] yy, hh; yy.length = count; hh.length = count; GdkDrawable*[] pixmaps; pixmaps.length = count; GdkRectangle rect; for (int i=0; i<count; i++) { auto path = OS.g_list_nth_data (list, i); OS.gtk_tree_view_get_cell_area (handle, path, null, &rect); pixmaps[i] = OS.gtk_tree_view_create_row_drag_icon(handle, path); OS.gdk_drawable_get_size(pixmaps[i], &w, &h); width = Math.max(width, w); height = rect.y + h - yy[0]; yy[i] = rect.y; hh[i] = h; } auto source = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, -1); auto gcSource = OS.gdk_gc_new(source); auto mask = OS.gdk_pixmap_new(OS.GDK_ROOT_PARENT(), width, height, 1); auto gcMask = OS.gdk_gc_new(mask); GdkColor color; color.pixel = 0; OS.gdk_gc_set_foreground(gcMask, &color); OS.gdk_draw_rectangle(mask, gcMask, 1, 0, 0, width, height); color.pixel = 1; OS.gdk_gc_set_foreground(gcMask, &color); for (int i=0; i<count; i++) { OS.gdk_draw_drawable(source, gcSource, pixmaps[i], 0, 0, 0, yy[i] - yy[0], -1, -1); OS.gdk_draw_rectangle(mask, gcMask, 1, 0, yy[i] - yy[0], width, hh[i]); OS.g_object_unref(pixmaps[i]); } OS.g_object_unref(gcSource); OS.g_object_unref(gcMask); dragSourceImage = Image.gtk_new(display, DWT.ICON, source, mask); } OS.g_list_free (list); return dragSourceImage; } }