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view dwt/dnd/TableDropTargetEffect.d @ 135:242e33c0e383
Added dnd source, ByteArrayTransfer,Clipboard completed
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 13 Feb 2008 04:51:22 +0100 |
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children | 3665cb9211b2 |
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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.TableDropTargetEffect; import dwt.graphics.Point; import dwt.internal.win32.OS; import dwt.widgets.Table; import dwt.widgets.TableItem; /** * This class provides a default drag under effect (eg. select, insert and scroll) * when a drag occurs over a <code>Table</code>. * * <p>Classes that wish to provide their own drag under effect for a <code>Table</code> * can extend the <code>TableDropTargetEffect</code> and override any applicable methods * in <code>TableDropTargetEffect</code> to display their own drag under effect.</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. * * <p>The feedback value is either one of the FEEDBACK constants defined in * class <code>DND</code> which is applicable to instances of this class, * or it must be built by <em>bitwise OR</em>'ing together * (that is, using the <code>int</code> "|" operator) two or more * of those <code>DND</code> effect constants. * </p> * <p> * <dl> * <dt><b>Feedback:</b></dt> * <dd>FEEDBACK_SELECT, FEEDBACK_SCROLL</dd> * </dl> * </p> * * @see DropTargetAdapter * @see DropTargetEvent * * @since 3.3 */ public class TableDropTargetEffect : DropTargetEffect { static final int SCROLL_HYSTERESIS = 200; // milli seconds int scrollIndex = -1; long scrollBeginTime; TableItem dropHighlight; /** * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified * <code>Table</code>. * * @param table the <code>Table</code> over which the user positions the cursor to drop the data */ public this(Table table) { super(table); } int checkEffect(int effect) { // Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified. if ((effect & DND.FEEDBACK_SELECT) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE; if ((effect & DND.FEEDBACK_INSERT_BEFORE) !is 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER; return effect; } /** * This implementation of <code>dragEnter</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. * * For additional information see <code>DropTargetAdapter.dragEnter</code>. * * Subclasses that override this method should call <code>super.dragEnter(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag enter event * * @see DropTargetAdapter * @see DropTargetEvent */ public void dragEnter(DropTargetEvent event) { scrollBeginTime = 0; scrollIndex = -1; dropHighlight = null; } /** * This implementation of <code>dragLeave</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. * * For additional information see <code>DropTargetAdapter.dragLeave</code>. * * Subclasses that override this method should call <code>super.dragLeave(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag leave event * * @see DropTargetAdapter * @see DropTargetEvent */ public void dragLeave(DropTargetEvent event) { Table table = (Table) control; int handle = table.handle; if (dropHighlight !is null) { LVITEM lvItem = new LVITEM (); lvItem.stateMask = OS.LVIS_DROPHILITED; OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem); dropHighlight = null; } scrollBeginTime = 0; scrollIndex = -1; } /** * This implementation of <code>dragOver</code> provides a default drag under effect * for the feedback specified in <code>event.feedback</code>. The class description * lists the FEEDBACK constants that are applicable to the class. * * For additional information see <code>DropTargetAdapter.dragOver</code>. * * Subclasses that override this method should call <code>super.dragOver(event)</code> * to get the default drag under effect implementation. * * @param event the information associated with the drag over event * * @see DropTargetAdapter * @see DropTargetEvent * @see DND#FEEDBACK_SELECT * @see DND#FEEDBACK_SCROLL */ public void dragOver(DropTargetEvent event) { Table table = (Table) getControl(); int effect = checkEffect(event.feedback); int handle = table.handle; Point coordinates = new Point(event.x, event.y); coordinates = table.toControl(coordinates); LVHITTESTINFO pinfo = new LVHITTESTINFO(); pinfo.x = coordinates.x; pinfo.y = coordinates.y; OS.SendMessage(handle, OS.LVM_HITTEST, 0, pinfo); if ((effect & DND.FEEDBACK_SCROLL) is 0) { scrollBeginTime = 0; scrollIndex = -1; } else { if (pinfo.iItem !is -1 && scrollIndex is pinfo.iItem && scrollBeginTime !is 0) { if (System.currentTimeMillis() >= scrollBeginTime) { int top = Math.max (0, OS.SendMessage (handle, OS.LVM_GETTOPINDEX, 0, 0)); int count = OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0); int index = (scrollIndex - 1 < top) ? Math.max(0, scrollIndex - 1) : Math.min(count - 1, scrollIndex + 1); bool scroll = true; if (pinfo.iItem is top) { scroll = pinfo.iItem !is index; } else { RECT itemRect = new RECT (); itemRect.left = OS.LVIR_BOUNDS; if (OS.SendMessage (handle, OS.LVM_GETITEMRECT, pinfo.iItem, itemRect) !is 0) { RECT rect = new RECT (); OS.GetClientRect (handle, rect); POINT pt = new POINT (); pt.x = itemRect.left; pt.y = itemRect.top; if (OS.PtInRect (rect, pt)) { pt.y = itemRect.bottom; if (OS.PtInRect (rect, pt)) scroll = false; } } } if (scroll) { OS.SendMessage (handle, OS.LVM_ENSUREVISIBLE, index, 0); table.redraw(); } scrollBeginTime = 0; scrollIndex = -1; } } else { scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS; scrollIndex = pinfo.iItem; } } if (pinfo.iItem !is -1 && (effect & DND.FEEDBACK_SELECT) !is 0) { TableItem item = table.getItem(pinfo.iItem); if (dropHighlight !is item) { LVITEM lvItem = new LVITEM(); lvItem.stateMask = OS.LVIS_DROPHILITED; OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem); lvItem.state = OS.LVIS_DROPHILITED; OS.SendMessage(handle, OS.LVM_SETITEMSTATE, pinfo.iItem, lvItem); dropHighlight = item; } } else { if (dropHighlight !is null) { LVITEM lvItem = new LVITEM (); lvItem.stateMask = OS.LVIS_DROPHILITED; OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem); dropHighlight = null; } } } }