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Java example source code file (DragGestureEvent.java)
The DragGestureEvent.java Java example source code/* * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt.dnd; import java.awt.Component; import java.awt.Cursor; import java.awt.Image; import java.awt.Point; import java.awt.event.InputEvent; import java.awt.datatransfer.Transferable; import java.util.EventObject; import java.util.Collections; import java.util.List; import java.util.Iterator; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; /** * A <code>DragGestureEvent is passed * to <code>DragGestureListener's * dragGestureRecognized() method * when a particular <code>DragGestureRecognizer detects that a * platform dependent drag initiating gesture has occurred * on the <code>Component that it is tracking. * * The {@code action} field of any {@code DragGestureEvent} instance should take one of the following * values: * <ul> * <li> {@code DnDConstants.ACTION_COPY} * <li> {@code DnDConstants.ACTION_MOVE} * <li> {@code DnDConstants.ACTION_LINK} * </ul> * Assigning the value different from listed above will cause an unspecified behavior. * * @see java.awt.dnd.DragGestureRecognizer * @see java.awt.dnd.DragGestureListener * @see java.awt.dnd.DragSource * @see java.awt.dnd.DnDConstants */ public class DragGestureEvent extends EventObject { private static final long serialVersionUID = 9080172649166731306L; /** * Constructs a <code>DragGestureEvent object given by the * <code>DragGestureRecognizer instance firing this event, * an {@code act} parameter representing * the user's preferred action, an {@code ori} parameter * indicating the origin of the drag, and a {@code List} of * events that comprise the gesture({@code evs} parameter). * <P> * @param dgr The <code>DragGestureRecognizer firing this event * @param act The user's preferred action. * For information on allowable values, see * the class description for {@link DragGestureEvent} * @param ori The origin of the drag * @param evs The <code>List of events that comprise the gesture * <P> * @throws IllegalArgumentException if any parameter equals {@code null} * @throws IllegalArgumentException if the act parameter does not comply with * the values given in the class * description for {@link DragGestureEvent} * @see java.awt.dnd.DnDConstants */ public DragGestureEvent(DragGestureRecognizer dgr, int act, Point ori, List<? extends InputEvent> evs) { super(dgr); if ((component = dgr.getComponent()) == null) throw new IllegalArgumentException("null component"); if ((dragSource = dgr.getDragSource()) == null) throw new IllegalArgumentException("null DragSource"); if (evs == null || evs.isEmpty()) throw new IllegalArgumentException("null or empty list of events"); if (act != DnDConstants.ACTION_COPY && act != DnDConstants.ACTION_MOVE && act != DnDConstants.ACTION_LINK) throw new IllegalArgumentException("bad action"); if (ori == null) throw new IllegalArgumentException("null origin"); events = evs; action = act; origin = ori; } /** * Returns the source as a <code>DragGestureRecognizer. * <P> * @return the source as a <code>DragGestureRecognizer */ public DragGestureRecognizer getSourceAsDragGestureRecognizer() { return (DragGestureRecognizer)getSource(); } /** * Returns the <code>Component associated * with this <code>DragGestureEvent. * <P> * @return the Component */ public Component getComponent() { return component; } /** * Returns the <code>DragSource. * <P> * @return the <code>DragSource */ public DragSource getDragSource() { return dragSource; } /** * Returns a <code>Point in the coordinates * of the <code>Component over which the drag originated. * <P> * @return the Point where the drag originated in Component coords. */ public Point getDragOrigin() { return origin; } /** * Returns an <code>Iterator for the events * comprising the gesture. * <P> * @return an Iterator for the events comprising the gesture */ @SuppressWarnings("unchecked") public Iterator<InputEvent> iterator() { return events.iterator(); } /** * Returns an <code>Object array of the * events comprising the drag gesture. * <P> * @return an array of the events comprising the gesture */ public Object[] toArray() { return events.toArray(); } /** * Returns an array of the events comprising the drag gesture. * <P> * @param array the array of <code>EventObject sub(types) * <P> * @return an array of the events comprising the gesture */ @SuppressWarnings("unchecked") public Object[] toArray(Object[] array) { return events.toArray(array); } /** * Returns an <code>int representing the * action selected by the user. * <P> * @return the action selected by the user */ public int getDragAction() { return action; } /** * Returns the initial event that triggered the gesture. * <P> * @return the first "triggering" event in the sequence of the gesture */ public InputEvent getTriggerEvent() { return getSourceAsDragGestureRecognizer().getTriggerEvent(); } /** * Starts the drag operation given the <code>Cursor for this drag * operation and the <code>Transferable representing the source data * for this drag operation. * <br> * If a <code>null Other Java examples (source code examples)Here is a short list of links related to this Java DragGestureEvent.java source code file: |
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