Java JButton Settings addMiddleButtonDragSupport(Component targetComponent)

Description

add Middle Button Drag Support

License

Open Source License

Declaration

public static void addMiddleButtonDragSupport(Component targetComponent) 

Method Source Code

//package com.java2s;
/*//from   ww w  .  j a v  a 2 s .  co m
 * Copyright (C) 2006-2011 by Olivier Chafik (http://ochafik.com)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;

import java.awt.Point;

import java.awt.event.MouseEvent;

import javax.swing.JViewport;
import javax.swing.SwingUtilities;

import javax.swing.event.MouseInputAdapter;

public class Main {
    public static void addMiddleButtonDragSupport(Component targetComponent) {
        MouseInputAdapter mia = new MouseInputAdapter() {
            int m_XDifference, m_YDifference;
            boolean m_dragging = false;

            public void mouseDragged(MouseEvent e) {
                if (!m_dragging)
                    return;

                Component target = e.getComponent();
                Container c = target.getParent();
                if (c instanceof JViewport) {
                    JViewport jv = (JViewport) c;
                    Point p = jv.getViewPosition();
                    int newX = p.x - (e.getX() - m_XDifference);
                    int newY = p.y - (e.getY() - m_YDifference);

                    int maxX = target.getWidth() - jv.getWidth();
                    int maxY = target.getHeight() - jv.getHeight();
                    if (newX < 0)
                        newX = 0;
                    if (newX > maxX)
                        newX = maxX;
                    if (newY < 0)
                        newY = 0;
                    if (newY > maxY)
                        newY = maxY;

                    jv.setViewPosition(new Point(newX, newY));
                }
            }

            Cursor oldCursor;

            public void mousePressed(MouseEvent e) {
                if (SwingUtilities.isMiddleMouseButton(e)) {
                    m_dragging = true;
                    oldCursor = e.getComponent().getCursor();
                    e.getComponent().setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
                    m_XDifference = e.getX();
                    m_YDifference = e.getY();
                }
            }

            public void mouseReleased(MouseEvent e) {
                if (m_dragging) {
                    e.getComponent().setCursor(oldCursor);
                    m_dragging = false;
                }
            }
        };
        targetComponent.addMouseMotionListener(mia);
        targetComponent.addMouseListener(mia);
    }
}

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