| 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 TreeDragUnderEffect extends DragUnderEffect { |
| |
| private Tree tree; |
| private TreeItem currentItem = null; |
| private int currentEffect = DND.FEEDBACK_NONE; |
| private TreeItem[] selection = new TreeItem[0]; |
| |
| TreeDragUnderEffect(Tree tree) { |
| this.tree = tree; |
| } |
| void show(int effect, int x, int y) { |
| TreeItem 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 = tree.getSelection(); |
| tree.setSelection(new TreeItem[0]); |
| } |
| boolean restoreSelection = currentEffect != effect && effect == DND.FEEDBACK_NONE; |
| setDragUnderEffect(effect, item); |
| if (restoreSelection) { |
| tree.setSelection(selection); |
| selection = new TreeItem[0]; |
| } |
| } |
| private TreeItem findItem(int x , int y){ |
| Point coordinates = new Point(x, y); |
| coordinates = tree.toControl(coordinates); |
| return tree.getItem(coordinates); |
| } |
| private void setDragUnderEffect(int effect, TreeItem item) { |
| switch (effect) { |
| case DND.FEEDBACK_SELECT: |
| if (currentEffect == DND.FEEDBACK_INSERT_AFTER || |
| currentEffect == DND.FEEDBACK_INSERT_BEFORE) { |
| setInsertMark(null, false); |
| currentEffect = DND.FEEDBACK_NONE; |
| currentItem = null; |
| } |
| if (currentEffect != effect || currentItem != item) { |
| setDropSelection(item); |
| currentEffect = DND.FEEDBACK_SELECT; |
| currentItem = item; |
| } |
| break; |
| case DND.FEEDBACK_INSERT_AFTER: |
| case DND.FEEDBACK_INSERT_BEFORE: |
| if (currentEffect == DND.FEEDBACK_SELECT) { |
| setDropSelection(null); |
| currentEffect = DND.FEEDBACK_NONE; |
| currentItem = null; |
| } |
| if (currentEffect != effect || currentItem != item) { |
| setInsertMark(item, effect == DND.FEEDBACK_INSERT_AFTER); |
| currentEffect = effect; |
| currentItem = item; |
| } |
| break; |
| default : |
| if (currentEffect == DND.FEEDBACK_INSERT_AFTER || |
| currentEffect == DND.FEEDBACK_INSERT_BEFORE) { |
| setInsertMark(null, false); |
| } |
| if (currentEffect == DND.FEEDBACK_SELECT) { |
| setDropSelection(null); |
| } |
| currentEffect = DND.FEEDBACK_NONE; |
| currentItem = null; |
| break; |
| } |
| } |
| private void setDropSelection (TreeItem item) { |
| if (item == null) { |
| tree.setSelection(new TreeItem[0]); |
| } else { |
| tree.setSelection(new TreeItem[]{item}); |
| } |
| } |
| private void setInsertMark (TreeItem item, boolean after) { |
| // not currently implemented |
| } |
| } |