| 1 | // Copyright 2004-2007 Jean-Francois Poilpret |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package net.sourceforge.hiveboard.drawing; |
| 16 | |
| 17 | import java.awt.Dimension; |
| 18 | import java.awt.Point; |
| 19 | import java.awt.Rectangle; |
| 20 | |
| 21 | import javax.swing.JComponent; |
| 22 | |
| 23 | public abstract class AbstractMouseDragTool |
| 24 | extends AbstractToggleButtonTool |
| 25 | implements MouseDragTool |
| 26 | { |
| 27 | protected boolean scroll(JComponent area, Point location) |
| 28 | { |
| 29 | int oldX = area.getX(); |
| 30 | int oldY = area.getY(); |
| 31 | area.scrollRectToVisible(new Rectangle(location, MIN_DIMENSION)); |
| 32 | boolean hasScrolled = (oldX != area.getX()) || (oldY != area.getY()); |
| 33 | if (hasScrolled) |
| 34 | { |
| 35 | _hasJustScrolled = true; |
| 36 | } |
| 37 | else |
| 38 | { |
| 39 | hasScrolled = _hasJustScrolled; |
| 40 | _hasJustScrolled = false; |
| 41 | } |
| 42 | return hasScrolled; |
| 43 | } |
| 44 | |
| 45 | static final private Dimension MIN_DIMENSION = new Dimension(1, 1); |
| 46 | |
| 47 | private boolean _hasJustScrolled = false; |
| 48 | } |