| /******************************************************************************* |
| * Copyright (c) 2007, 2012 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 |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.*; |
| import org.eclipse.swt.internal.win32.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * 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 |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| * |
| * @since 3.3 |
| */ |
| public class TableDropTargetEffect extends DropTargetEffect { |
| static final int SCROLL_HYSTERESIS = 200; // milli seconds |
| |
| int scrollIndex = -1; |
| long scrollBeginTime; |
| TableItem dropHighlight; |
| int iItemInsert = -1; |
| |
| /** |
| * 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 TableDropTargetEffect(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) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE; |
| if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 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 |
| */ |
| @Override |
| public void dragEnter(DropTargetEvent event) { |
| scrollBeginTime = 0; |
| scrollIndex = -1; |
| dropHighlight = null; |
| iItemInsert = -1; |
| } |
| |
| /** |
| * 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 |
| */ |
| @Override |
| public void dragLeave(DropTargetEvent event) { |
| Table table = (Table) control; |
| long /*int*/ handle = table.handle; |
| if (dropHighlight != null) { |
| LVITEM lvItem = new LVITEM (); |
| lvItem.stateMask = OS.LVIS_DROPHILITED; |
| OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem); |
| dropHighlight = null; |
| } |
| if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION(5, 1)) { |
| if (iItemInsert != -1) { |
| LVINSERTMARK plvim = new LVINSERTMARK (); |
| plvim.cbSize = LVINSERTMARK.sizeof; |
| plvim.iItem = -1; |
| OS.SendMessage(handle, OS.LVM_SETINSERTMARK, 0, plvim); |
| iItemInsert = -1; |
| } |
| } |
| 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 |
| */ |
| @Override |
| public void dragOver(DropTargetEvent event) { |
| Table table = (Table) getControl(); |
| int effect = checkEffect(event.feedback); |
| long /*int*/ handle = table.handle; |
| Point coordinates = new Point(event.x, event.y); |
| coordinates = DPIUtil.autoScaleUp(table.toControl(coordinates)); // To Pixels |
| 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) == 0) { |
| scrollBeginTime = 0; |
| scrollIndex = -1; |
| } else { |
| if (pinfo.iItem != -1 && scrollIndex == pinfo.iItem && scrollBeginTime != 0) { |
| if (System.currentTimeMillis() >= scrollBeginTime) { |
| int top = Math.max (0, (int)/*64*/OS.SendMessage (handle, OS.LVM_GETTOPINDEX, 0, 0)); |
| int count = (int)/*64*/OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0); |
| int index = (scrollIndex - 1 < top) ? Math.max(0, scrollIndex - 1) : Math.min(count - 1, scrollIndex + 1); |
| boolean scroll = true; |
| if (pinfo.iItem == top) { |
| scroll = pinfo.iItem != index; |
| } else { |
| RECT itemRect = new RECT (); |
| itemRect.left = OS.LVIR_BOUNDS; |
| if (OS.SendMessage (handle, OS.LVM_GETITEMRECT, pinfo.iItem, itemRect) != 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 != -1 && (effect & DND.FEEDBACK_SELECT) != 0) { |
| TableItem item = table.getItem(pinfo.iItem); |
| if (dropHighlight != 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 != null) { |
| LVITEM lvItem = new LVITEM (); |
| lvItem.stateMask = OS.LVIS_DROPHILITED; |
| OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem); |
| dropHighlight = null; |
| } |
| } |
| if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION(5, 1)) { |
| if (pinfo.iItem != -1 && (effect & (DND.FEEDBACK_INSERT_BEFORE | DND.FEEDBACK_INSERT_AFTER)) != 0) { |
| LVINSERTMARK plvim = new LVINSERTMARK (); |
| plvim.cbSize = LVINSERTMARK.sizeof; |
| plvim.dwFlags = (effect & DND.FEEDBACK_INSERT_AFTER) != 0 ? OS.LVIM_AFTER : 0; |
| plvim.iItem = pinfo.iItem; |
| if (OS.SendMessage(handle, OS.LVM_SETINSERTMARK, 0, plvim) != 0) { |
| iItemInsert = pinfo.iItem; |
| } |
| } else { |
| if (iItemInsert != -1) { |
| LVINSERTMARK plvim = new LVINSERTMARK (); |
| plvim.cbSize = LVINSERTMARK.sizeof; |
| plvim.iItem = -1; |
| OS.SendMessage(handle, OS.LVM_SETINSERTMARK, 0, plvim); |
| iItemInsert = -1; |
| } |
| } |
| } |
| } |
| } |