| package org.eclipse.swt.dnd; |
| |
| /* |
| * Copyright (c) 2000, 2002 IBM Corp. All rights reserved. |
| * This file is made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| */ |
| |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| class TableDragUnderEffect extends DragUnderEffect { |
| private Table table; |
| private TableItem currentItem; |
| private TableItem[] selection = new TableItem[0]; |
| private int currentEffect = DND.FEEDBACK_NONE; |
| |
| TableDragUnderEffect(Table table) { |
| this.table = table; |
| } |
| void show(int effect, int x, int y) { |
| TableItem item = null; |
| if (effect != DND.FEEDBACK_NONE) item = findItem(x, y); |
| if (item == null) effect = DND.FEEDBACK_NONE; |
| if (currentEffect != effect && currentEffect == DND.FEEDBACK_NONE) { |
| selection = table.getSelection(); |
| table.setSelection(new TableItem[0]); |
| } |
| boolean restoreSelection = currentEffect != effect && effect == DND.FEEDBACK_NONE; |
| setDragUnderEffect(effect, item); |
| if (restoreSelection) { |
| table.setSelection(selection); |
| selection = new TableItem[0]; |
| } |
| } |
| private TableItem findItem(int x, int y){ |
| if (table == null) return null; |
| Point coordinates = new Point(x, y); |
| coordinates = table.toControl(coordinates); |
| return table.getItem(coordinates); |
| } |
| private void setDragUnderEffect(int effect, TableItem item) { |
| if (currentItem != item) { |
| if (item == null) { |
| table.setSelection(new TableItem[0]); |
| } else { |
| table.setSelection(new TableItem[] {item}); |
| } |
| currentItem = item; |
| } |
| currentEffect = effect; |
| } |
| } |