/* 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. 
 * 
 * This file is available and licensed under the following license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *   * Neither the name of Sun Microsystems nor the names of its contributors 
 *     may be used to endorse or promote products derived from this software 
 *     without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package draganddrop;

import javafx.scene.image.*;
import javafx.scene.input.*;

public class DraggableImage extends ImageView {
    public var maxX = 200.0;
    public var maxY = 200.0;
    var startX = 0.0;
    var startY = 0.0;
    
    override var onMousePressed = function(e:MouseEvent):Void {
        startX = e.sceneX-translateX;
        startY = e.sceneY-translateY;
    }
    
    override var onMouseDragged = function(e:MouseEvent):Void {
        var tx = e.sceneX-startX;
        if(tx < 0) { tx = 0; }
        if(tx > maxX - image.width) { tx = maxX - image.width; }
        translateX = tx;

        var ty = e.sceneY-startY;
        if(ty < 0) { ty = 0; }
        if(ty > maxY - image.height) { ty = maxY - image.height; }
        translateY = ty;
    }
    
    override var onMouseReleased = function(e:MouseEvent):Void {
    }
}

JavaFX Sample

/* 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. 
 * 
 * This file is available and licensed under the following license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *   * Neither the name of Sun Microsystems nor the names of its contributors 
 *     may be used to endorse or promote products derived from this software 
 *     without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package draganddrop;

import javafx.scene.image.*;
import javafx.scene.input.*;

public class DraggableImage extends ImageView {
    public var maxX = 200.0;
    public var maxY = 200.0;
    var startX = 0.0;
    var startY = 0.0;
    
    override var onMousePressed = function(e:MouseEvent):Void {
        startX = e.sceneX-translateX;
        startY = e.sceneY-translateY;
    }
    
    override var onMouseDragged = function(e:MouseEvent):Void {
        var tx = e.sceneX-startX;
        if(tx < 0) { tx = 0; }
        if(tx > maxX - image.width) { tx = maxX - image.width; }
        translateX = tx;

        var ty = e.sceneY-startY;
        if(ty < 0) { ty = 0; }
        if(ty > maxY - image.height) { ty = maxY - image.height; }
        translateY = ty;
    }
    
    override var onMouseReleased = function(e:MouseEvent):Void {
    }
}