1 /*
   2  * Copyright (c) 2012, 2014, Oracle and/or its affiliates.
   3  * All rights reserved. Use is subject to license terms.
   4  *
   5  * This file is available and licensed under the following license:
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  *  - Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *  - Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the distribution.
  16  *  - Neither the name of Oracle Corporation nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 package com.oracle.javafx.scenebuilder.kit.editor.panel.content.gesture.mouse;
  33 
  34 import com.oracle.javafx.scenebuilder.kit.editor.panel.content.ContentPanelController;
  35 import com.oracle.javafx.scenebuilder.kit.editor.panel.content.gesture.AbstractGesture;
  36 
  37 import javafx.scene.Node;
  38 import javafx.scene.input.InputEvent;
  39 import javafx.scene.input.MouseEvent;
  40 
  41 /**
  42  *
  43  *
  44  */
  45 public abstract class AbstractMouseDragGesture extends AbstractGesture {
  46 
  47 
  48     private Observer observer;
  49     private Node eventTarget;
  50 
  51     public AbstractMouseDragGesture(ContentPanelController contentPanelController) {
  52         super(contentPanelController);
  53     }
  54 
  55 
  56     protected abstract void mousePressed(MouseEvent e);
  57     protected abstract void mouseDragDetected(MouseEvent e);
  58     protected abstract void mouseReleased(MouseEvent e);
  59     protected abstract void mouseExited(MouseEvent e);
  60 
  61     /*
  62      * AbstractGesture
  63      */
  64 
  65     @Override
  66     public void start(InputEvent e, Observer observer) {
  67         assert e != null;
  68         assert e instanceof MouseEvent;
  69         assert e.getEventType() == MouseEvent.MOUSE_PRESSED;
  70         assert e.getTarget() instanceof Node;
  71         assert observer != null;
  72 
  73         this.observer = observer;
  74         this.eventTarget = (Node) e.getTarget();
  75 
  76         assert eventTarget.getOnDragDetected() == null;
  77         assert eventTarget.getOnMouseReleased() == null;
  78         assert eventTarget.getOnMouseExited() == null;
  79 
  80         eventTarget.setOnDragDetected(e1 -> {
  81             try {
  82                 mouseDragDetected(e1);
  83             } finally {
  84                 performTermination();
  85             }
  86         });
  87         eventTarget.setOnMouseReleased(e1 -> {
  88             try {
  89                 mouseReleased(e1);
  90             } finally {
  91                 performTermination();
  92             }
  93         });
  94         eventTarget.setOnMouseExited(e1 -> {
  95             try {
  96                 mouseExited(e1);
  97             } finally {
  98                 performTermination();
  99             }
 100         });
 101 
 102         try {
 103             mousePressed((MouseEvent) e);
 104         } catch(RuntimeException x) {
 105             performTermination();
 106             throw x;
 107         }
 108     }
 109 
 110 
 111     /*
 112      * Private
 113      */
 114 
 115     private void performTermination() {
 116         eventTarget.setOnDragDetected(null);
 117         eventTarget.setOnMouseReleased(null);
 118         eventTarget.setOnMouseExited(null);
 119 
 120         try {
 121             observer.gestureDidTerminate(this);
 122         } finally {
 123             observer = null;
 124             eventTarget = null;
 125         }
 126     }
 127 
 128 }