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/*
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* Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.swing;
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import java.awt.*;
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import java.awt.event.*;
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import java.awt.datatransfer.*;
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import java.awt.dnd.*;
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import java.beans.*;
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import java.lang.reflect.*;
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import java.io.*;
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import java.util.TooManyListenersException;
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import javax.swing.plaf.UIResource;
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import javax.swing.event.*;
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import javax.swing.text.JTextComponent;
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import sun.reflect.misc.MethodUtil;
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import sun.swing.SwingUtilities2;
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import sun.awt.AppContext;
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import sun.swing.*;
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/**
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* This class is used to handle the transfer of a <code>Transferable</code>
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* to and from Swing components. The <code>Transferable</code> is used to
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* represent data that is exchanged via a cut, copy, or paste
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* to/from a clipboard. It is also used in drag-and-drop operations
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* to represent a drag from a component, and a drop to a component.
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* Swing provides functionality that automatically supports cut, copy,
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* and paste keyboard bindings that use the functionality provided by
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* an implementation of this class. Swing also provides functionality
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* that automatically supports drag and drop that uses the functionality
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* provided by an implementation of this class. The Swing developer can
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* concentrate on specifying the semantics of a transfer primarily by setting
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* the <code>transferHandler</code> property on a Swing component.
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* <p>
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* This class is implemented to provide a default behavior of transferring
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* a component property simply by specifying the name of the property in
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* the constructor. For example, to transfer the foreground color from
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* one component to another either via the clipboard or a drag and drop operation
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* a <code>TransferHandler</code> can be constructed with the string "foreground". The
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* built in support will use the color returned by <code>getForeground</code> as the source
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* of the transfer, and <code>setForeground</code> for the target of a transfer.
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* <p>
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* Please see
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* <a href="http://java.sun.com/docs/books/tutorial/uiswing/misc/dnd.html">
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* How to Use Drag and Drop and Data Transfer</a>,
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* a section in <em>The Java Tutorial</em>, for more information.
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*
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*
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* @author Timothy Prinzing
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* @author Shannon Hickey
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* @since 1.4
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*/
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@SuppressWarnings("serial")
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public class TransferHandler implements Serializable {
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/**
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* An <code>int</code> representing no transfer action.
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*/
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public static final int NONE = DnDConstants.ACTION_NONE;
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/**
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* An <code>int</code> representing a "copy" transfer action.
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* This value is used when data is copied to a clipboard
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* or copied elsewhere in a drag and drop operation.
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*/
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public static final int COPY = DnDConstants.ACTION_COPY;
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/**
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* An <code>int</code> representing a "move" transfer action.
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* This value is used when data is moved to a clipboard (i.e. a cut)
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* or moved elsewhere in a drag and drop operation.
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*/
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public static final int MOVE = DnDConstants.ACTION_MOVE;
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/**
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* An <code>int</code> representing a source action capability of either
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* "copy" or "move".
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*/
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public static final int COPY_OR_MOVE = DnDConstants.ACTION_COPY_OR_MOVE;
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/**
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* An <code>int</code> representing a "link" transfer action.
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* This value is used to specify that data should be linked in a drag
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* and drop operation.
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*
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* @see java.awt.dnd.DnDConstants#ACTION_LINK
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* @since 1.6
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*/
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public static final int LINK = DnDConstants.ACTION_LINK;
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/**
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* An interface to tag things with a {@code getTransferHandler} method.
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*/
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interface HasGetTransferHandler {
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/** Returns the {@code TransferHandler}.
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*
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* @return The {@code TransferHandler} or {@code null}
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*/
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public TransferHandler getTransferHandler();
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}
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/**
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* Represents a location where dropped data should be inserted.
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* This is a base class that only encapsulates a point.
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* Components supporting drop may provide subclasses of this
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* containing more information.
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* <p>
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* Developers typically shouldn't create instances of, or extend, this
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* class. Instead, these are something provided by the DnD
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* implementation by <code>TransferSupport</code> instances and by
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* components with a <code>getDropLocation()</code> method.
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*
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* @see javax.swing.TransferHandler.TransferSupport#getDropLocation
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* @since 1.6
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*/
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public static class DropLocation {
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private final Point dropPoint;
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/**
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* Constructs a drop location for the given point.
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*
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* @param dropPoint the drop point, representing the mouse's
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* current location within the component.
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* @throws IllegalArgumentException if the point
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* is <code>null</code>
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*/
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protected DropLocation(Point dropPoint) {
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if (dropPoint == null) {
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throw new IllegalArgumentException("Point cannot be null");
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}
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this.dropPoint = new Point(dropPoint);
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}
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/**
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* Returns the drop point, representing the mouse's
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* current location within the component.
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*
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* @return the drop point.
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*/
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public final Point getDropPoint() {
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return new Point(dropPoint);
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}
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/**
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* Returns a string representation of this drop location.
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* This method is intended to be used for debugging purposes,
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* and the content and format of the returned string may vary
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* between implementations.
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*
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* @return a string representation of this drop location
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*/
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public String toString() {
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return getClass().getName() + "[dropPoint=" + dropPoint + "]";
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}
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};
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/**
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* This class encapsulates all relevant details of a clipboard
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* or drag and drop transfer, and also allows for customizing
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* aspects of the drag and drop experience.
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* <p>
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* The main purpose of this class is to provide the information
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* needed by a developer to determine the suitability of a
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* transfer or to import the data contained within. But it also
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* doubles as a controller for customizing properties during drag
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* and drop, such as whether or not to show the drop location,
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* and which drop action to use.
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* <p>
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* Developers typically need not create instances of this
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* class. Instead, they are something provided by the DnD
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* implementation to certain methods in <code>TransferHandler</code>.
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*
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* @see #canImport(TransferHandler.TransferSupport)
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* @see #importData(TransferHandler.TransferSupport)
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* @since 1.6
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*/
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public final static class TransferSupport {
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private boolean isDrop;
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private Component component;
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private boolean showDropLocationIsSet;
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private boolean showDropLocation;
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private int dropAction = -1;
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/**
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* The source is a {@code DropTargetDragEvent} or
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* {@code DropTargetDropEvent} for drops,
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* and a {@code Transferable} otherwise
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*/
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private Object source;
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private DropLocation dropLocation;
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/**
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* Create a <code>TransferSupport</code> with <code>isDrop()</code>
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* <code>true</code> for the given component, event, and index.
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*
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* @param component the target component
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* @param event a <code>DropTargetEvent</code>
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*/
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private TransferSupport(Component component,
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DropTargetEvent event) {
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isDrop = true;
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setDNDVariables(component, event);
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}
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/**
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* Create a <code>TransferSupport</code> with <code>isDrop()</code>
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* <code>false</code> for the given component and
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* <code>Transferable</code>.
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*
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* @param component the target component
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* @param transferable the transferable
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* @throws NullPointerException if either parameter
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* is <code>null</code>
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*/
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public TransferSupport(Component component, Transferable transferable) {
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if (component == null) {
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throw new NullPointerException("component is null");
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}
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if (transferable == null) {
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throw new NullPointerException("transferable is null");
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}
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isDrop = false;
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this.component = component;
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this.source = transferable;
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}
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/**
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* Allows for a single instance to be reused during DnD.
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*
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* @param component the target component
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* @param event a <code>DropTargetEvent</code>
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*/
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private void setDNDVariables(Component component,
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DropTargetEvent event) {
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assert isDrop;
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this.component = component;
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this.source = event;
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dropLocation = null;
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dropAction = -1;
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showDropLocationIsSet = false;
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if (source == null) {
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return;
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}
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assert source instanceof DropTargetDragEvent ||
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source instanceof DropTargetDropEvent;
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Point p = source instanceof DropTargetDragEvent
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? ((DropTargetDragEvent)source).getLocation()
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: ((DropTargetDropEvent)source).getLocation();
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if (component instanceof JTextComponent) {
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try {
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AccessibleMethod method
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= new AccessibleMethod(JTextComponent.class,
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"dropLocationForPoint",
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Point.class);
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dropLocation =
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(DropLocation)method.invokeNoChecked(component, p);
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} catch (NoSuchMethodException e) {
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throw new AssertionError(
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"Couldn't locate method JTextComponent.dropLocationForPoint");
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}
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} else if (component instanceof JComponent) {
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dropLocation = ((JComponent)component).dropLocationForPoint(p);
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}
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/*
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* The drop location may be null at this point if the component
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* doesn't return custom drop locations. In this case, a point-only
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* drop location will be created lazily when requested.
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*/
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}
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/**
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* Returns whether or not this <code>TransferSupport</code>
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* represents a drop operation.
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*
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* @return <code>true</code> if this is a drop operation,
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* <code>false</code> otherwise.
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*/
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public boolean isDrop() {
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return isDrop;
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}
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/**
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* Returns the target component of this transfer.
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*
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* @return the target component
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*/
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public Component getComponent() {
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return component;
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}
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/**
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* Checks that this is a drop and throws an
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* {@code IllegalStateException} if it isn't.
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*
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* @throws IllegalStateException if {@code isDrop} is false.
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*/
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private void assureIsDrop() {
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if (!isDrop) {
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throw new IllegalStateException("Not a drop");
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}
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}
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/**
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* Returns the current (non-{@code null}) drop location for the component,
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* when this {@code TransferSupport} represents a drop.
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* <p>
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* Note: For components with built-in drop support, this location
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* will be a subclass of {@code DropLocation} of the same type
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* returned by that component's {@code getDropLocation} method.
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* <p>
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* This method is only for use with drag and drop transfers.
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* Calling it when {@code isDrop()} is {@code false} results
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* in an {@code IllegalStateException}.
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*
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* @return the drop location
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* @throws IllegalStateException if this is not a drop
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* @see #isDrop
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*/
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public DropLocation getDropLocation() {
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assureIsDrop();
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if (dropLocation == null) {
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/*
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* component didn't give us a custom drop location,
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* so lazily create a point-only location
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*/
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Point p = source instanceof DropTargetDragEvent
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? ((DropTargetDragEvent)source).getLocation()
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: ((DropTargetDropEvent)source).getLocation();
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dropLocation = new DropLocation(p);
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}
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return dropLocation;
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}
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/**
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* Sets whether or not the drop location should be visually indicated
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* for the transfer - which must represent a drop. This is applicable to
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* those components that automatically
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* show the drop location when appropriate during a drag and drop
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* operation). By default, the drop location is shown only when the
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* {@code TransferHandler} has said it can accept the import represented
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* by this {@code TransferSupport}. With this method you can force the
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* drop location to always be shown, or always not be shown.
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* <p>
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* This method is only for use with drag and drop transfers.
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* Calling it when {@code isDrop()} is {@code false} results
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* in an {@code IllegalStateException}.
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*
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* @param showDropLocation whether or not to indicate the drop location
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* @throws IllegalStateException if this is not a drop
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* @see #isDrop
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*/
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public void setShowDropLocation(boolean showDropLocation) {
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assureIsDrop();
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this.showDropLocation = showDropLocation;
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this.showDropLocationIsSet = true;
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}
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/**
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* Sets the drop action for the transfer - which must represent a drop
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* - to the given action,
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* instead of the default user drop action. The action must be
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* supported by the source's drop actions, and must be one
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* of {@code COPY}, {@code MOVE} or {@code LINK}.
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* <p>
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* This method is only for use with drag and drop transfers.
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* Calling it when {@code isDrop()} is {@code false} results
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* in an {@code IllegalStateException}.
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*
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* @param dropAction the drop action
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* @throws IllegalStateException if this is not a drop
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* @throws IllegalArgumentException if an invalid action is specified
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* @see #getDropAction
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* @see #getUserDropAction
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* @see #getSourceDropActions
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* @see #isDrop
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*/
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public void setDropAction(int dropAction) {
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assureIsDrop();
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int action = dropAction & getSourceDropActions();
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if (!(action == COPY || action == MOVE || action == LINK)) {
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throw new IllegalArgumentException("unsupported drop action: " + dropAction);
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}
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|
428 |
|
|
429 |
this.dropAction = dropAction;
|
|
430 |
}
|
|
431 |
|
|
432 |
/**
|
|
433 |
* Returns the action chosen for the drop, when this
|
|
434 |
* {@code TransferSupport} represents a drop.
|
|
435 |
* <p>
|
|
436 |
* Unless explicitly chosen by way of {@code setDropAction},
|
|
437 |
* this returns the user drop action provided by
|
|
438 |
* {@code getUserDropAction}.
|
|
439 |
* <p>
|
|
440 |
* You may wish to query this in {@code TransferHandler}'s
|
|
441 |
* {@code importData} method to customize processing based
|
|
442 |
* on the action.
|
|
443 |
* <p>
|
|
444 |
* This method is only for use with drag and drop transfers.
|
|
445 |
* Calling it when {@code isDrop()} is {@code false} results
|
|
446 |
* in an {@code IllegalStateException}.
|
|
447 |
*
|
|
448 |
* @return the action chosen for the drop
|
|
449 |
* @throws IllegalStateException if this is not a drop
|
|
450 |
* @see #setDropAction
|
|
451 |
* @see #getUserDropAction
|
|
452 |
* @see #isDrop
|
|
453 |
*/
|
|
454 |
public int getDropAction() {
|
|
455 |
return dropAction == -1 ? getUserDropAction() : dropAction;
|
|
456 |
}
|
|
457 |
|
|
458 |
/**
|
|
459 |
* Returns the user drop action for the drop, when this
|
|
460 |
* {@code TransferSupport} represents a drop.
|
|
461 |
* <p>
|
|
462 |
* The user drop action is chosen for a drop as described in the
|
|
463 |
* documentation for {@link java.awt.dnd.DropTargetDragEvent} and
|
|
464 |
* {@link java.awt.dnd.DropTargetDropEvent}. A different action
|
|
465 |
* may be chosen as the drop action by way of the {@code setDropAction}
|
|
466 |
* method.
|
|
467 |
* <p>
|
|
468 |
* You may wish to query this in {@code TransferHandler}'s
|
|
469 |
* {@code canImport} method when determining the suitability of a
|
|
470 |
* drop or when deciding on a drop action to explicitly choose.
|
|
471 |
* <p>
|
|
472 |
* This method is only for use with drag and drop transfers.
|
|
473 |
* Calling it when {@code isDrop()} is {@code false} results
|
|
474 |
* in an {@code IllegalStateException}.
|
|
475 |
*
|
|
476 |
* @return the user drop action
|
|
477 |
* @throws IllegalStateException if this is not a drop
|
|
478 |
* @see #setDropAction
|
|
479 |
* @see #getDropAction
|
|
480 |
* @see #isDrop
|
|
481 |
*/
|
|
482 |
public int getUserDropAction() {
|
|
483 |
assureIsDrop();
|
|
484 |
|
|
485 |
return (source instanceof DropTargetDragEvent)
|
|
486 |
? ((DropTargetDragEvent)source).getDropAction()
|
|
487 |
: ((DropTargetDropEvent)source).getDropAction();
|
|
488 |
}
|
|
489 |
|
|
490 |
/**
|
|
491 |
* Returns the drag source's supported drop actions, when this
|
|
492 |
* {@code TransferSupport} represents a drop.
|
|
493 |
* <p>
|
|
494 |
* The source actions represent the set of actions supported by the
|
|
495 |
* source of this transfer, and are represented as some bitwise-OR
|
|
496 |
* combination of {@code COPY}, {@code MOVE} and {@code LINK}.
|
|
497 |
* You may wish to query this in {@code TransferHandler}'s
|
|
498 |
* {@code canImport} method when determining the suitability of a drop
|
|
499 |
* or when deciding on a drop action to explicitly choose. To determine
|
|
500 |
* if a particular action is supported by the source, bitwise-AND
|
|
501 |
* the action with the source drop actions, and then compare the result
|
|
502 |
* against the original action. For example:
|
|
503 |
* <pre>
|
|
504 |
* boolean copySupported = (COPY & getSourceDropActions()) == COPY;
|
|
505 |
* </pre>
|
|
506 |
* <p>
|
|
507 |
* This method is only for use with drag and drop transfers.
|
|
508 |
* Calling it when {@code isDrop()} is {@code false} results
|
|
509 |
* in an {@code IllegalStateException}.
|
|
510 |
*
|
|
511 |
* @return the drag source's supported drop actions
|
|
512 |
* @throws IllegalStateException if this is not a drop
|
|
513 |
* @see #isDrop
|
|
514 |
*/
|
|
515 |
public int getSourceDropActions() {
|
|
516 |
assureIsDrop();
|
|
517 |
|
|
518 |
return (source instanceof DropTargetDragEvent)
|
|
519 |
? ((DropTargetDragEvent)source).getSourceActions()
|
|
520 |
: ((DropTargetDropEvent)source).getSourceActions();
|
|
521 |
}
|
|
522 |
|
|
523 |
/**
|
|
524 |
* Returns the data flavors for this transfer.
|
|
525 |
*
|
|
526 |
* @return the data flavors for this transfer
|
|
527 |
*/
|
|
528 |
public DataFlavor[] getDataFlavors() {
|
|
529 |
if (isDrop) {
|
|
530 |
if (source instanceof DropTargetDragEvent) {
|
|
531 |
return ((DropTargetDragEvent)source).getCurrentDataFlavors();
|
|
532 |
} else {
|
|
533 |
return ((DropTargetDropEvent)source).getCurrentDataFlavors();
|
|
534 |
}
|
|
535 |
}
|
|
536 |
|
|
537 |
return ((Transferable)source).getTransferDataFlavors();
|
|
538 |
}
|
|
539 |
|
|
540 |
/**
|
|
541 |
* Returns whether or not the given data flavor is supported.
|
|
542 |
*
|
|
543 |
* @param df the <code>DataFlavor</code> to test
|
|
544 |
* @return whether or not the given flavor is supported.
|
|
545 |
*/
|
|
546 |
public boolean isDataFlavorSupported(DataFlavor df) {
|
|
547 |
if (isDrop) {
|
|
548 |
if (source instanceof DropTargetDragEvent) {
|
|
549 |
return ((DropTargetDragEvent)source).isDataFlavorSupported(df);
|
|
550 |
} else {
|
|
551 |
return ((DropTargetDropEvent)source).isDataFlavorSupported(df);
|
|
552 |
}
|
|
553 |
}
|
|
554 |
|
|
555 |
return ((Transferable)source).isDataFlavorSupported(df);
|
|
556 |
}
|
|
557 |
|
|
558 |
/**
|
|
559 |
* Returns the <code>Transferable</code> associated with this transfer.
|
|
560 |
* <p>
|
|
561 |
* Note: Unless it is necessary to fetch the <code>Transferable</code>
|
|
562 |
* directly, use one of the other methods on this class to inquire about
|
|
563 |
* the transfer. This may perform better than fetching the
|
|
564 |
* <code>Transferable</code> and asking it directly.
|
|
565 |
*
|
|
566 |
* @return the <code>Transferable</code> associated with this transfer
|
|
567 |
*/
|
|
568 |
public Transferable getTransferable() {
|
|
569 |
if (isDrop) {
|
|
570 |
if (source instanceof DropTargetDragEvent) {
|
|
571 |
return ((DropTargetDragEvent)source).getTransferable();
|
|
572 |
} else {
|
|
573 |
return ((DropTargetDropEvent)source).getTransferable();
|
|
574 |
}
|
|
575 |
}
|
|
576 |
|
|
577 |
return (Transferable)source;
|
|
578 |
}
|
|
579 |
}
|
|
580 |
|
|
581 |
|
|
582 |
/**
|
|
583 |
* Returns an {@code Action} that performs cut operations to the
|
|
584 |
* clipboard. When performed, this action operates on the {@code JComponent}
|
|
585 |
* source of the {@code ActionEvent} by invoking {@code exportToClipboard},
|
|
586 |
* with a {@code MOVE} action, on the component's {@code TransferHandler}.
|
|
587 |
*
|
|
588 |
* @return an {@code Action} for performing cuts to the clipboard
|
|
589 |
*/
|
|
590 |
public static Action getCutAction() {
|
|
591 |
return cutAction;
|
|
592 |
}
|
|
593 |
|
|
594 |
/**
|
|
595 |
* Returns an {@code Action} that performs copy operations to the
|
|
596 |
* clipboard. When performed, this action operates on the {@code JComponent}
|
|
597 |
* source of the {@code ActionEvent} by invoking {@code exportToClipboard},
|
|
598 |
* with a {@code COPY} action, on the component's {@code TransferHandler}.
|
|
599 |
*
|
|
600 |
* @return an {@code Action} for performing copies to the clipboard
|
|
601 |
*/
|
|
602 |
public static Action getCopyAction() {
|
|
603 |
return copyAction;
|
|
604 |
}
|
|
605 |
|
|
606 |
/**
|
|
607 |
* Returns an {@code Action} that performs paste operations from the
|
|
608 |
* clipboard. When performed, this action operates on the {@code JComponent}
|
|
609 |
* source of the {@code ActionEvent} by invoking {@code importData},
|
|
610 |
* with the clipboard contents, on the component's {@code TransferHandler}.
|
|
611 |
*
|
|
612 |
* @return an {@code Action} for performing pastes from the clipboard
|
|
613 |
*/
|
|
614 |
public static Action getPasteAction() {
|
|
615 |
return pasteAction;
|
|
616 |
}
|
|
617 |
|
|
618 |
|
|
619 |
/**
|
|
620 |
* Constructs a transfer handler that can transfer a Java Bean property
|
|
621 |
* from one component to another via the clipboard or a drag and drop
|
|
622 |
* operation.
|
|
623 |
*
|
|
624 |
* @param property the name of the property to transfer; this can
|
|
625 |
* be <code>null</code> if there is no property associated with the transfer
|
|
626 |
* handler (a subclass that performs some other kind of transfer, for example)
|
|
627 |
*/
|
|
628 |
public TransferHandler(String property) {
|
|
629 |
propertyName = property;
|
|
630 |
}
|
|
631 |
|
|
632 |
/**
|
|
633 |
* Convenience constructor for subclasses.
|
|
634 |
*/
|
|
635 |
protected TransferHandler() {
|
|
636 |
this(null);
|
|
637 |
}
|
|
638 |
|
|
639 |
/**
|
|
640 |
* Causes the Swing drag support to be initiated. This is called by
|
|
641 |
* the various UI implementations in the <code>javax.swing.plaf.basic</code>
|
|
642 |
* package if the dragEnabled property is set on the component.
|
|
643 |
* This can be called by custom UI
|
|
644 |
* implementations to use the Swing drag support. This method can also be called
|
|
645 |
* by a Swing extension written as a subclass of <code>JComponent</code>
|
|
646 |
* to take advantage of the Swing drag support.
|
|
647 |
* <p>
|
|
648 |
* The transfer <em>will not necessarily</em> have been completed at the
|
|
649 |
* return of this call (i.e. the call does not block waiting for the drop).
|
|
650 |
* The transfer will take place through the Swing implementation of the
|
|
651 |
* <code>java.awt.dnd</code> mechanism, requiring no further effort
|
|
652 |
* from the developer. The <code>exportDone</code> method will be called
|
|
653 |
* when the transfer has completed.
|
|
654 |
*
|
|
655 |
* @param comp the component holding the data to be transferred;
|
|
656 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
657 |
* @param e the event that triggered the transfer
|
|
658 |
* @param action the transfer action initially requested;
|
|
659 |
* either {@code COPY}, {@code MOVE} or {@code LINK};
|
|
660 |
* the DnD system may change the action used during the
|
|
661 |
* course of the drag operation
|
|
662 |
*/
|
|
663 |
public void exportAsDrag(JComponent comp, InputEvent e, int action) {
|
|
664 |
int srcActions = getSourceActions(comp);
|
|
665 |
|
|
666 |
// only mouse events supported for drag operations
|
|
667 |
if (!(e instanceof MouseEvent)
|
|
668 |
// only support known actions
|
|
669 |
|| !(action == COPY || action == MOVE || action == LINK)
|
|
670 |
// only support valid source actions
|
|
671 |
|| (srcActions & action) == 0) {
|
|
672 |
|
|
673 |
action = NONE;
|
|
674 |
}
|
|
675 |
|
|
676 |
if (action != NONE && !GraphicsEnvironment.isHeadless()) {
|
|
677 |
if (recognizer == null) {
|
|
678 |
recognizer = new SwingDragGestureRecognizer(new DragHandler());
|
|
679 |
}
|
|
680 |
recognizer.gestured(comp, (MouseEvent)e, srcActions, action);
|
|
681 |
} else {
|
|
682 |
exportDone(comp, null, NONE);
|
|
683 |
}
|
|
684 |
}
|
|
685 |
|
|
686 |
/**
|
|
687 |
* Causes a transfer from the given component to the
|
|
688 |
* given clipboard. This method is called by the default cut and
|
|
689 |
* copy actions registered in a component's action map.
|
|
690 |
* <p>
|
|
691 |
* The transfer will take place using the <code>java.awt.datatransfer</code>
|
|
692 |
* mechanism, requiring no further effort from the developer. Any data
|
|
693 |
* transfer <em>will</em> be complete and the <code>exportDone</code>
|
|
694 |
* method will be called with the action that occurred, before this method
|
|
695 |
* returns. Should the clipboard be unavailable when attempting to place
|
|
696 |
* data on it, the <code>IllegalStateException</code> thrown by
|
|
697 |
* {@link Clipboard#setContents(Transferable, ClipboardOwner)} will
|
|
698 |
* be propogated through this method. However,
|
|
699 |
* <code>exportDone</code> will first be called with an action
|
|
700 |
* of <code>NONE</code> for consistency.
|
|
701 |
*
|
|
702 |
* @param comp the component holding the data to be transferred;
|
|
703 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
704 |
* @param clip the clipboard to transfer the data into
|
|
705 |
* @param action the transfer action requested; this should
|
|
706 |
* be a value of either <code>COPY</code> or <code>MOVE</code>;
|
|
707 |
* the operation performed is the intersection of the transfer
|
|
708 |
* capabilities given by getSourceActions and the requested action;
|
|
709 |
* the intersection may result in an action of <code>NONE</code>
|
|
710 |
* if the requested action isn't supported
|
|
711 |
* @throws IllegalStateException if the clipboard is currently unavailable
|
|
712 |
* @see Clipboard#setContents(Transferable, ClipboardOwner)
|
|
713 |
*/
|
|
714 |
public void exportToClipboard(JComponent comp, Clipboard clip, int action)
|
|
715 |
throws IllegalStateException {
|
|
716 |
|
|
717 |
if ((action == COPY || action == MOVE)
|
|
718 |
&& (getSourceActions(comp) & action) != 0) {
|
|
719 |
|
|
720 |
Transferable t = createTransferable(comp);
|
|
721 |
if (t != null) {
|
|
722 |
try {
|
|
723 |
clip.setContents(t, null);
|
|
724 |
exportDone(comp, t, action);
|
|
725 |
return;
|
|
726 |
} catch (IllegalStateException ise) {
|
|
727 |
exportDone(comp, t, NONE);
|
|
728 |
throw ise;
|
|
729 |
}
|
|
730 |
}
|
|
731 |
}
|
|
732 |
|
|
733 |
exportDone(comp, null, NONE);
|
|
734 |
}
|
|
735 |
|
|
736 |
/**
|
|
737 |
* Causes a transfer to occur from a clipboard or a drag and
|
|
738 |
* drop operation. The <code>Transferable</code> to be
|
|
739 |
* imported and the component to transfer to are contained
|
|
740 |
* within the <code>TransferSupport</code>.
|
|
741 |
* <p>
|
|
742 |
* While the drag and drop implementation calls {@code canImport}
|
|
743 |
* to determine the suitability of a transfer before calling this
|
|
744 |
* method, the implementation of paste does not. As such, it cannot
|
|
745 |
* be assumed that the transfer is acceptable upon a call to
|
|
746 |
* this method for paste. It is recommended that {@code canImport} be
|
|
747 |
* explicitly called to cover this case.
|
|
748 |
* <p>
|
|
749 |
* Note: The <code>TransferSupport</code> object passed to this method
|
|
750 |
* is only valid for the duration of the method call. It is undefined
|
|
751 |
* what values it may contain after this method returns.
|
|
752 |
*
|
|
753 |
* @param support the object containing the details of
|
|
754 |
* the transfer, not <code>null</code>.
|
|
755 |
* @return true if the data was inserted into the component,
|
|
756 |
* false otherwise
|
|
757 |
* @throws NullPointerException if <code>support</code> is {@code null}
|
|
758 |
* @see #canImport(TransferHandler.TransferSupport)
|
|
759 |
* @since 1.6
|
|
760 |
*/
|
|
761 |
public boolean importData(TransferSupport support) {
|
|
762 |
return support.getComponent() instanceof JComponent
|
|
763 |
? importData((JComponent)support.getComponent(), support.getTransferable())
|
|
764 |
: false;
|
|
765 |
}
|
|
766 |
|
|
767 |
/**
|
|
768 |
* Causes a transfer to a component from a clipboard or a
|
|
769 |
* DND drop operation. The <code>Transferable</code> represents
|
|
770 |
* the data to be imported into the component.
|
|
771 |
* <p>
|
|
772 |
* Note: Swing now calls the newer version of <code>importData</code>
|
|
773 |
* that takes a <code>TransferSupport</code>, which in turn calls this
|
|
774 |
* method (if the component in the {@code TransferSupport} is a
|
|
775 |
* {@code JComponent}). Developers are encouraged to call and override the
|
|
776 |
* newer version as it provides more information (and is the only
|
|
777 |
* version that supports use with a {@code TransferHandler} set directly
|
|
778 |
* on a {@code JFrame} or other non-{@code JComponent}).
|
|
779 |
*
|
|
780 |
* @param comp the component to receive the transfer;
|
|
781 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
782 |
* @param t the data to import
|
|
783 |
* @return true if the data was inserted into the component, false otherwise
|
|
784 |
* @see #importData(TransferHandler.TransferSupport)
|
|
785 |
*/
|
|
786 |
public boolean importData(JComponent comp, Transferable t) {
|
|
787 |
PropertyDescriptor prop = getPropertyDescriptor(comp);
|
|
788 |
if (prop != null) {
|
|
789 |
Method writer = prop.getWriteMethod();
|
|
790 |
if (writer == null) {
|
|
791 |
// read-only property. ignore
|
|
792 |
return false;
|
|
793 |
}
|
|
794 |
Class<?>[] params = writer.getParameterTypes();
|
|
795 |
if (params.length != 1) {
|
|
796 |
// zero or more than one argument, ignore
|
|
797 |
return false;
|
|
798 |
}
|
|
799 |
DataFlavor flavor = getPropertyDataFlavor(params[0], t.getTransferDataFlavors());
|
|
800 |
if (flavor != null) {
|
|
801 |
try {
|
|
802 |
Object value = t.getTransferData(flavor);
|
|
803 |
Object[] args = { value };
|
|
804 |
MethodUtil.invoke(writer, comp, args);
|
|
805 |
return true;
|
|
806 |
} catch (Exception ex) {
|
|
807 |
System.err.println("Invocation failed");
|
|
808 |
// invocation code
|
|
809 |
}
|
|
810 |
}
|
|
811 |
}
|
|
812 |
return false;
|
|
813 |
}
|
|
814 |
|
|
815 |
/**
|
|
816 |
* This method is called repeatedly during a drag and drop operation
|
|
817 |
* to allow the developer to configure properties of, and to return
|
|
818 |
* the acceptability of transfers; with a return value of {@code true}
|
|
819 |
* indicating that the transfer represented by the given
|
|
820 |
* {@code TransferSupport} (which contains all of the details of the
|
|
821 |
* transfer) is acceptable at the current time, and a value of {@code false}
|
|
822 |
* rejecting the transfer.
|
|
823 |
* <p>
|
|
824 |
* For those components that automatically display a drop location during
|
|
825 |
* drag and drop, accepting the transfer, by default, tells them to show
|
|
826 |
* the drop location. This can be changed by calling
|
|
827 |
* {@code setShowDropLocation} on the {@code TransferSupport}.
|
|
828 |
* <p>
|
|
829 |
* By default, when the transfer is accepted, the chosen drop action is that
|
|
830 |
* picked by the user via their drag gesture. The developer can override
|
|
831 |
* this and choose a different action, from the supported source
|
|
832 |
* actions, by calling {@code setDropAction} on the {@code TransferSupport}.
|
|
833 |
* <p>
|
|
834 |
* On every call to {@code canImport}, the {@code TransferSupport} contains
|
|
835 |
* fresh state. As such, any properties set on it must be set on every
|
|
836 |
* call. Upon a drop, {@code canImport} is called one final time before
|
|
837 |
* calling into {@code importData}. Any state set on the
|
|
838 |
* {@code TransferSupport} during that last call will be available in
|
|
839 |
* {@code importData}.
|
|
840 |
* <p>
|
|
841 |
* This method is not called internally in response to paste operations.
|
|
842 |
* As such, it is recommended that implementations of {@code importData}
|
|
843 |
* explicitly call this method for such cases and that this method
|
|
844 |
* be prepared to return the suitability of paste operations as well.
|
|
845 |
* <p>
|
|
846 |
* Note: The <code>TransferSupport</code> object passed to this method
|
|
847 |
* is only valid for the duration of the method call. It is undefined
|
|
848 |
* what values it may contain after this method returns.
|
|
849 |
*
|
|
850 |
* @param support the object containing the details of
|
|
851 |
* the transfer, not <code>null</code>.
|
|
852 |
* @return <code>true</code> if the import can happen,
|
|
853 |
* <code>false</code> otherwise
|
|
854 |
* @throws NullPointerException if <code>support</code> is {@code null}
|
|
855 |
* @see #importData(TransferHandler.TransferSupport)
|
|
856 |
* @see javax.swing.TransferHandler.TransferSupport#setShowDropLocation
|
|
857 |
* @see javax.swing.TransferHandler.TransferSupport#setDropAction
|
|
858 |
* @since 1.6
|
|
859 |
*/
|
|
860 |
public boolean canImport(TransferSupport support) {
|
|
861 |
return support.getComponent() instanceof JComponent
|
|
862 |
? canImport((JComponent)support.getComponent(), support.getDataFlavors())
|
|
863 |
: false;
|
|
864 |
}
|
|
865 |
|
|
866 |
/**
|
|
867 |
* Indicates whether a component will accept an import of the given
|
|
868 |
* set of data flavors prior to actually attempting to import it.
|
|
869 |
* <p>
|
|
870 |
* Note: Swing now calls the newer version of <code>canImport</code>
|
|
871 |
* that takes a <code>TransferSupport</code>, which in turn calls this
|
|
872 |
* method (only if the component in the {@code TransferSupport} is a
|
|
873 |
* {@code JComponent}). Developers are encouraged to call and override the
|
|
874 |
* newer version as it provides more information (and is the only
|
|
875 |
* version that supports use with a {@code TransferHandler} set directly
|
|
876 |
* on a {@code JFrame} or other non-{@code JComponent}).
|
|
877 |
*
|
|
878 |
* @param comp the component to receive the transfer;
|
|
879 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
880 |
* @param transferFlavors the data formats available
|
|
881 |
* @return true if the data can be inserted into the component, false otherwise
|
|
882 |
* @see #canImport(TransferHandler.TransferSupport)
|
|
883 |
*/
|
|
884 |
public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {
|
|
885 |
PropertyDescriptor prop = getPropertyDescriptor(comp);
|
|
886 |
if (prop != null) {
|
|
887 |
Method writer = prop.getWriteMethod();
|
|
888 |
if (writer == null) {
|
|
889 |
// read-only property. ignore
|
|
890 |
return false;
|
|
891 |
}
|
|
892 |
Class<?>[] params = writer.getParameterTypes();
|
|
893 |
if (params.length != 1) {
|
|
894 |
// zero or more than one argument, ignore
|
|
895 |
return false;
|
|
896 |
}
|
|
897 |
DataFlavor flavor = getPropertyDataFlavor(params[0], transferFlavors);
|
|
898 |
if (flavor != null) {
|
|
899 |
return true;
|
|
900 |
}
|
|
901 |
}
|
|
902 |
return false;
|
|
903 |
}
|
|
904 |
|
|
905 |
/**
|
|
906 |
* Returns the type of transfer actions supported by the source;
|
|
907 |
* any bitwise-OR combination of {@code COPY}, {@code MOVE}
|
|
908 |
* and {@code LINK}.
|
|
909 |
* <p>
|
|
910 |
* Some models are not mutable, so a transfer operation of {@code MOVE}
|
|
911 |
* should not be advertised in that case. Returning {@code NONE}
|
|
912 |
* disables transfers from the component.
|
|
913 |
*
|
|
914 |
* @param c the component holding the data to be transferred;
|
|
915 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
916 |
* @return {@code COPY} if the transfer property can be found,
|
|
917 |
* otherwise returns <code>NONE</code>
|
|
918 |
*/
|
|
919 |
public int getSourceActions(JComponent c) {
|
|
920 |
PropertyDescriptor prop = getPropertyDescriptor(c);
|
|
921 |
if (prop != null) {
|
|
922 |
return COPY;
|
|
923 |
}
|
|
924 |
return NONE;
|
|
925 |
}
|
|
926 |
|
|
927 |
/**
|
|
928 |
* Returns an object that establishes the look of a transfer. This is
|
|
929 |
* useful for both providing feedback while performing a drag operation and for
|
|
930 |
* representing the transfer in a clipboard implementation that has a visual
|
|
931 |
* appearance. The implementation of the <code>Icon</code> interface should
|
|
932 |
* not alter the graphics clip or alpha level.
|
|
933 |
* The icon implementation need not be rectangular or paint all of the
|
|
934 |
* bounding rectangle and logic that calls the icons paint method should
|
|
935 |
* not assume the all bits are painted. <code>null</code> is a valid return value
|
|
936 |
* for this method and indicates there is no visual representation provided.
|
|
937 |
* In that case, the calling logic is free to represent the
|
|
938 |
* transferable however it wants.
|
|
939 |
* <p>
|
|
940 |
* The default Swing logic will not do an alpha blended drag animation if
|
|
941 |
* the return is <code>null</code>.
|
|
942 |
*
|
|
943 |
* @param t the data to be transferred; this value is expected to have been
|
|
944 |
* created by the <code>createTransferable</code> method
|
|
945 |
* @return <code>null</code>, indicating
|
|
946 |
* there is no default visual representation
|
|
947 |
*/
|
|
948 |
public Icon getVisualRepresentation(Transferable t) {
|
|
949 |
return null;
|
|
950 |
}
|
|
951 |
|
|
952 |
/**
|
|
953 |
* Creates a <code>Transferable</code> to use as the source for
|
|
954 |
* a data transfer. Returns the representation of the data to
|
|
955 |
* be transferred, or <code>null</code> if the component's
|
|
956 |
* property is <code>null</code>
|
|
957 |
*
|
|
958 |
* @param c the component holding the data to be transferred;
|
|
959 |
* provided to enable sharing of <code>TransferHandler</code>s
|
|
960 |
* @return the representation of the data to be transferred, or
|
|
961 |
* <code>null</code> if the property associated with <code>c</code>
|
|
962 |
* is <code>null</code>
|
|
963 |
*
|
|
964 |
*/
|
|
965 |
protected Transferable createTransferable(JComponent c) {
|
|
966 |
PropertyDescriptor property = getPropertyDescriptor(c);
|
|
967 |
if (property != null) {
|
|
968 |
return new PropertyTransferable(property, c);
|
|
969 |
}
|
|
970 |
return null;
|
|
971 |
}
|
|
972 |
|
|
973 |
/**
|
|
974 |
* Invoked after data has been exported. This method should remove
|
|
975 |
* the data that was transferred if the action was <code>MOVE</code>.
|
|
976 |
* <p>
|
|
977 |
* This method is implemented to do nothing since <code>MOVE</code>
|
|
978 |
* is not a supported action of this implementation
|
|
979 |
* (<code>getSourceActions</code> does not include <code>MOVE</code>).
|
|
980 |
*
|
|
981 |
* @param source the component that was the source of the data
|
|
982 |
* @param data The data that was transferred or possibly null
|
|
983 |
* if the action is <code>NONE</code>.
|
|
984 |
* @param action the actual action that was performed
|
|
985 |
*/
|
|
986 |
protected void exportDone(JComponent source, Transferable data, int action) {
|
|
987 |
}
|
|
988 |
|
|
989 |
/**
|
|
990 |
* Fetches the property descriptor for the property assigned to this transfer
|
|
991 |
* handler on the given component (transfer handler may be shared). This
|
|
992 |
* returns <code>null</code> if the property descriptor can't be found
|
|
993 |
* or there is an error attempting to fetch the property descriptor.
|
|
994 |
*/
|
|
995 |
private PropertyDescriptor getPropertyDescriptor(JComponent comp) {
|
|
996 |
if (propertyName == null) {
|
|
997 |
return null;
|
|
998 |
}
|
|
999 |
Class<?> k = comp.getClass();
|
|
1000 |
BeanInfo bi;
|
|
1001 |
try {
|
|
1002 |
bi = Introspector.getBeanInfo(k);
|
|
1003 |
} catch (IntrospectionException ex) {
|
|
1004 |
return null;
|
|
1005 |
}
|
|
1006 |
PropertyDescriptor props[] = bi.getPropertyDescriptors();
|
|
1007 |
for (int i=0; i < props.length; i++) {
|
|
1008 |
if (propertyName.equals(props[i].getName())) {
|
|
1009 |
Method reader = props[i].getReadMethod();
|
|
1010 |
|
|
1011 |
if (reader != null) {
|
|
1012 |
Class<?>[] params = reader.getParameterTypes();
|
|
1013 |
|
|
1014 |
if (params == null || params.length == 0) {
|
|
1015 |
// found the desired descriptor
|
|
1016 |
return props[i];
|
|
1017 |
}
|
|
1018 |
}
|
|
1019 |
}
|
|
1020 |
}
|
|
1021 |
return null;
|
|
1022 |
}
|
|
1023 |
|
|
1024 |
/**
|
|
1025 |
* Fetches the data flavor from the array of possible flavors that
|
|
1026 |
* has data of the type represented by property type. Null is
|
|
1027 |
* returned if there is no match.
|
|
1028 |
*/
|
|
1029 |
private DataFlavor getPropertyDataFlavor(Class<?> k, DataFlavor[] flavors) {
|
|
1030 |
for(int i = 0; i < flavors.length; i++) {
|
|
1031 |
DataFlavor flavor = flavors[i];
|
|
1032 |
if ("application".equals(flavor.getPrimaryType()) &&
|
|
1033 |
"x-java-jvm-local-objectref".equals(flavor.getSubType()) &&
|
|
1034 |
k.isAssignableFrom(flavor.getRepresentationClass())) {
|
|
1035 |
|
|
1036 |
return flavor;
|
|
1037 |
}
|
|
1038 |
}
|
|
1039 |
return null;
|
|
1040 |
}
|
|
1041 |
|
|
1042 |
|
|
1043 |
private String propertyName;
|
|
1044 |
private static SwingDragGestureRecognizer recognizer = null;
|
|
1045 |
|
|
1046 |
private static DropTargetListener getDropTargetListener() {
|
|
1047 |
synchronized(DropHandler.class) {
|
|
1048 |
DropHandler handler =
|
|
1049 |
(DropHandler)AppContext.getAppContext().get(DropHandler.class);
|
|
1050 |
|
|
1051 |
if (handler == null) {
|
|
1052 |
handler = new DropHandler();
|
|
1053 |
AppContext.getAppContext().put(DropHandler.class, handler);
|
|
1054 |
}
|
|
1055 |
|
|
1056 |
return handler;
|
|
1057 |
}
|
|
1058 |
}
|
|
1059 |
|
|
1060 |
static class PropertyTransferable implements Transferable {
|
|
1061 |
|
|
1062 |
PropertyTransferable(PropertyDescriptor p, JComponent c) {
|
|
1063 |
property = p;
|
|
1064 |
component = c;
|
|
1065 |
}
|
|
1066 |
|
|
1067 |
// --- Transferable methods ----------------------------------------------
|
|
1068 |
|
|
1069 |
/**
|
|
1070 |
* Returns an array of <code>DataFlavor</code> objects indicating the flavors the data
|
|
1071 |
* can be provided in. The array should be ordered according to preference
|
|
1072 |
* for providing the data (from most richly descriptive to least descriptive).
|
|
1073 |
* @return an array of data flavors in which this data can be transferred
|
|
1074 |
*/
|
|
1075 |
public DataFlavor[] getTransferDataFlavors() {
|
|
1076 |
DataFlavor[] flavors = new DataFlavor[1];
|
|
1077 |
Class<?> propertyType = property.getPropertyType();
|
|
1078 |
String mimeType = DataFlavor.javaJVMLocalObjectMimeType + ";class=" + propertyType.getName();
|
|
1079 |
try {
|
|
1080 |
flavors[0] = new DataFlavor(mimeType);
|
|
1081 |
} catch (ClassNotFoundException cnfe) {
|
|
1082 |
flavors = new DataFlavor[0];
|
|
1083 |
}
|
|
1084 |
return flavors;
|
|
1085 |
}
|
|
1086 |
|
|
1087 |
/**
|
|
1088 |
* Returns whether the specified data flavor is supported for
|
|
1089 |
* this object.
|
|
1090 |
* @param flavor the requested flavor for the data
|
|
1091 |
* @return true if this <code>DataFlavor</code> is supported,
|
|
1092 |
* otherwise false
|
|
1093 |
*/
|
|
1094 |
public boolean isDataFlavorSupported(DataFlavor flavor) {
|
|
1095 |
Class<?> propertyType = property.getPropertyType();
|
|
1096 |
if ("application".equals(flavor.getPrimaryType()) &&
|
|
1097 |
"x-java-jvm-local-objectref".equals(flavor.getSubType()) &&
|
|
1098 |
flavor.getRepresentationClass().isAssignableFrom(propertyType)) {
|
|
1099 |
|
|
1100 |
return true;
|
|
1101 |
}
|
|
1102 |
return false;
|
|
1103 |
}
|
|
1104 |
|
|
1105 |
/**
|
|
1106 |
* Returns an object which represents the data to be transferred. The class
|
|
1107 |
* of the object returned is defined by the representation class of the flavor.
|
|
1108 |
*
|
|
1109 |
* @param flavor the requested flavor for the data
|
|
1110 |
* @see DataFlavor#getRepresentationClass
|
|
1111 |
* @exception IOException if the data is no longer available
|
|
1112 |
* in the requested flavor.
|
|
1113 |
* @exception UnsupportedFlavorException if the requested data flavor is
|
|
1114 |
* not supported.
|
|
1115 |
*/
|
|
1116 |
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
|
|
1117 |
if (! isDataFlavorSupported(flavor)) {
|
|
1118 |
throw new UnsupportedFlavorException(flavor);
|
|
1119 |
}
|
|
1120 |
Method reader = property.getReadMethod();
|
|
1121 |
Object value = null;
|
|
1122 |
try {
|
|
1123 |
value = MethodUtil.invoke(reader, component, (Object[])null);
|
|
1124 |
} catch (Exception ex) {
|
|
1125 |
throw new IOException("Property read failed: " + property.getName());
|
|
1126 |
}
|
|
1127 |
return value;
|
|
1128 |
}
|
|
1129 |
|
|
1130 |
JComponent component;
|
|
1131 |
PropertyDescriptor property;
|
|
1132 |
}
|
|
1133 |
|
|
1134 |
/**
|
|
1135 |
* This is the default drop target for drag and drop operations if
|
|
1136 |
* one isn't provided by the developer. <code>DropTarget</code>
|
|
1137 |
* only supports one <code>DropTargetListener</code> and doesn't
|
|
1138 |
* function properly if it isn't set.
|
|
1139 |
* This class sets the one listener as the linkage of drop handling
|
|
1140 |
* to the <code>TransferHandler</code>, and adds support for
|
|
1141 |
* additional listeners which some of the <code>ComponentUI</code>
|
|
1142 |
* implementations install to manipulate a drop insertion location.
|
|
1143 |
*/
|
|
1144 |
static class SwingDropTarget extends DropTarget implements UIResource {
|
|
1145 |
|
|
1146 |
SwingDropTarget(Component c) {
|
|
1147 |
super(c, COPY_OR_MOVE | LINK, null);
|
|
1148 |
try {
|
|
1149 |
// addDropTargetListener is overridden
|
|
1150 |
// we specifically need to add to the superclass
|
|
1151 |
super.addDropTargetListener(getDropTargetListener());
|
|
1152 |
} catch (TooManyListenersException tmle) {}
|
|
1153 |
}
|
|
1154 |
|
|
1155 |
public void addDropTargetListener(DropTargetListener dtl) throws TooManyListenersException {
|
|
1156 |
// Since the super class only supports one DropTargetListener,
|
|
1157 |
// and we add one from the constructor, we always add to the
|
|
1158 |
// extended list.
|
|
1159 |
if (listenerList == null) {
|
|
1160 |
listenerList = new EventListenerList();
|
|
1161 |
}
|
|
1162 |
listenerList.add(DropTargetListener.class, dtl);
|
|
1163 |
}
|
|
1164 |
|
|
1165 |
public void removeDropTargetListener(DropTargetListener dtl) {
|
|
1166 |
if (listenerList != null) {
|
|
1167 |
listenerList.remove(DropTargetListener.class, dtl);
|
|
1168 |
}
|
|
1169 |
}
|
|
1170 |
|
|
1171 |
// --- DropTargetListener methods (multicast) --------------------------
|
|
1172 |
|
|
1173 |
public void dragEnter(DropTargetDragEvent e) {
|
|
1174 |
super.dragEnter(e);
|
|
1175 |
if (listenerList != null) {
|
|
1176 |
Object[] listeners = listenerList.getListenerList();
|
|
1177 |
for (int i = listeners.length-2; i>=0; i-=2) {
|
|
1178 |
if (listeners[i]==DropTargetListener.class) {
|
|
1179 |
((DropTargetListener)listeners[i+1]).dragEnter(e);
|
|
1180 |
}
|
|
1181 |
}
|
|
1182 |
}
|
|
1183 |
}
|
|
1184 |
|
|
1185 |
public void dragOver(DropTargetDragEvent e) {
|
|
1186 |
super.dragOver(e);
|
|
1187 |
if (listenerList != null) {
|
|
1188 |
Object[] listeners = listenerList.getListenerList();
|
|
1189 |
for (int i = listeners.length-2; i>=0; i-=2) {
|
|
1190 |
if (listeners[i]==DropTargetListener.class) {
|
|
1191 |
((DropTargetListener)listeners[i+1]).dragOver(e);
|
|
1192 |
}
|
|
1193 |
}
|
|
1194 |
}
|
|
1195 |
}
|
|
1196 |
|
|
1197 |
public void dragExit(DropTargetEvent e) {
|
|
1198 |
super.dragExit(e);
|
|
1199 |
if (listenerList != null) {
|
|
1200 |
Object[] listeners = listenerList.getListenerList();
|
|
1201 |
for (int i = listeners.length-2; i>=0; i-=2) {
|
|
1202 |
if (listeners[i]==DropTargetListener.class) {
|
|
1203 |
((DropTargetListener)listeners[i+1]).dragExit(e);
|
|
1204 |
}
|
|
1205 |
}
|
|
1206 |
}
|
|
1207 |
}
|
|
1208 |
|
|
1209 |
public void drop(DropTargetDropEvent e) {
|
|
1210 |
super.drop(e);
|
|
1211 |
if (listenerList != null) {
|
|
1212 |
Object[] listeners = listenerList.getListenerList();
|
|
1213 |
for (int i = listeners.length-2; i>=0; i-=2) {
|
|
1214 |
if (listeners[i]==DropTargetListener.class) {
|
|
1215 |
((DropTargetListener)listeners[i+1]).drop(e);
|
|
1216 |
}
|
|
1217 |
}
|
|
1218 |
}
|
|
1219 |
}
|
|
1220 |
|
|
1221 |
public void dropActionChanged(DropTargetDragEvent e) {
|
|
1222 |
super.dropActionChanged(e);
|
|
1223 |
if (listenerList != null) {
|
|
1224 |
Object[] listeners = listenerList.getListenerList();
|
|
1225 |
for (int i = listeners.length-2; i>=0; i-=2) {
|
|
1226 |
if (listeners[i]==DropTargetListener.class) {
|
|
1227 |
((DropTargetListener)listeners[i+1]).dropActionChanged(e);
|
|
1228 |
}
|
|
1229 |
}
|
|
1230 |
}
|
|
1231 |
}
|
|
1232 |
|
|
1233 |
private EventListenerList listenerList;
|
|
1234 |
}
|
|
1235 |
|
|
1236 |
private static class DropHandler implements DropTargetListener,
|
|
1237 |
Serializable,
|
|
1238 |
ActionListener {
|
|
1239 |
|
|
1240 |
private Timer timer;
|
|
1241 |
private Point lastPosition;
|
|
1242 |
private Rectangle outer = new Rectangle();
|
|
1243 |
private Rectangle inner = new Rectangle();
|
|
1244 |
private int hysteresis = 10;
|
|
1245 |
|
|
1246 |
private Component component;
|
|
1247 |
private Object state;
|
|
1248 |
private TransferSupport support =
|
|
1249 |
new TransferSupport(null, (DropTargetEvent)null);
|
|
1250 |
|
|
1251 |
private static final int AUTOSCROLL_INSET = 10;
|
|
1252 |
|
|
1253 |
/**
|
|
1254 |
* Update the geometry of the autoscroll region. The geometry is
|
|
1255 |
* maintained as a pair of rectangles. The region can cause
|
|
1256 |
* a scroll if the pointer sits inside it for the duration of the
|
|
1257 |
* timer. The region that causes the timer countdown is the area
|
|
1258 |
* between the two rectangles.
|
|
1259 |
* <p>
|
|
1260 |
* This is implemented to use the visible area of the component
|
|
1261 |
* as the outer rectangle, and the insets are fixed at 10. Should
|
|
1262 |
* the component be smaller than a total of 20 in any direction,
|
|
1263 |
* autoscroll will not occur in that direction.
|
|
1264 |
*/
|
|
1265 |
private void updateAutoscrollRegion(JComponent c) {
|
|
1266 |
// compute the outer
|
|
1267 |
Rectangle visible = c.getVisibleRect();
|
|
1268 |
outer.setBounds(visible.x, visible.y, visible.width, visible.height);
|
|
1269 |
|
|
1270 |
// compute the insets
|
|
1271 |
Insets i = new Insets(0, 0, 0, 0);
|
|
1272 |
if (c instanceof Scrollable) {
|
|
1273 |
int minSize = 2 * AUTOSCROLL_INSET;
|
|
1274 |
|
|
1275 |
if (visible.width >= minSize) {
|
|
1276 |
i.left = i.right = AUTOSCROLL_INSET;
|
|
1277 |
}
|
|
1278 |
|
|
1279 |
if (visible.height >= minSize) {
|
|
1280 |
i.top = i.bottom = AUTOSCROLL_INSET;
|
|
1281 |
}
|
|
1282 |
}
|
|
1283 |
|
|
1284 |
// set the inner from the insets
|
|
1285 |
inner.setBounds(visible.x + i.left,
|
|
1286 |
visible.y + i.top,
|
|
1287 |
visible.width - (i.left + i.right),
|
|
1288 |
visible.height - (i.top + i.bottom));
|
|
1289 |
}
|
|
1290 |
|
|
1291 |
/**
|
|
1292 |
* Perform an autoscroll operation. This is implemented to scroll by the
|
|
1293 |
* unit increment of the Scrollable using scrollRectToVisible. If the
|
|
1294 |
* cursor is in a corner of the autoscroll region, more than one axis will
|
|
1295 |
* scroll.
|
|
1296 |
*/
|
|
1297 |
private void autoscroll(JComponent c, Point pos) {
|
|
1298 |
if (c instanceof Scrollable) {
|
|
1299 |
Scrollable s = (Scrollable) c;
|
|
1300 |
if (pos.y < inner.y) {
|
|
1301 |
// scroll upward
|
|
1302 |
int dy = s.getScrollableUnitIncrement(outer, SwingConstants.VERTICAL, -1);
|
|
1303 |
Rectangle r = new Rectangle(inner.x, outer.y - dy, inner.width, dy);
|
|
1304 |
c.scrollRectToVisible(r);
|
|
1305 |
} else if (pos.y > (inner.y + inner.height)) {
|
|
1306 |
// scroll downard
|
|
1307 |
int dy = s.getScrollableUnitIncrement(outer, SwingConstants.VERTICAL, 1);
|
|
1308 |
Rectangle r = new Rectangle(inner.x, outer.y + outer.height, inner.width, dy);
|
|
1309 |
c.scrollRectToVisible(r);
|
|
1310 |
}
|
|
1311 |
|
|
1312 |
if (pos.x < inner.x) {
|
|
1313 |
// scroll left
|
|
1314 |
int dx = s.getScrollableUnitIncrement(outer, SwingConstants.HORIZONTAL, -1);
|
|
1315 |
Rectangle r = new Rectangle(outer.x - dx, inner.y, dx, inner.height);
|
|
1316 |
c.scrollRectToVisible(r);
|
|
1317 |
} else if (pos.x > (inner.x + inner.width)) {
|
|
1318 |
// scroll right
|
|
1319 |
int dx = s.getScrollableUnitIncrement(outer, SwingConstants.HORIZONTAL, 1);
|
|
1320 |
Rectangle r = new Rectangle(outer.x + outer.width, inner.y, dx, inner.height);
|
|
1321 |
c.scrollRectToVisible(r);
|
|
1322 |
}
|
|
1323 |
}
|
|
1324 |
}
|
|
1325 |
|
|
1326 |
/**
|
|
1327 |
* Initializes the internal properties if they haven't been already
|
|
1328 |
* inited. This is done lazily to avoid loading of desktop properties.
|
|
1329 |
*/
|
|
1330 |
private void initPropertiesIfNecessary() {
|
|
1331 |
if (timer == null) {
|
|
1332 |
Toolkit t = Toolkit.getDefaultToolkit();
|
|
1333 |
Integer prop;
|
|
1334 |
|
|
1335 |
prop = (Integer)
|
|
1336 |
t.getDesktopProperty("DnD.Autoscroll.interval");
|
|
1337 |
|
|
1338 |
timer = new Timer(prop == null ? 100 : prop.intValue(), this);
|
|
1339 |
|
|
1340 |
prop = (Integer)
|
|
1341 |
t.getDesktopProperty("DnD.Autoscroll.initialDelay");
|
|
1342 |
|
|
1343 |
timer.setInitialDelay(prop == null ? 100 : prop.intValue());
|
|
1344 |
|
|
1345 |
prop = (Integer)
|
|
1346 |
t.getDesktopProperty("DnD.Autoscroll.cursorHysteresis");
|
|
1347 |
|
|
1348 |
if (prop != null) {
|
|
1349 |
hysteresis = prop.intValue();
|
|
1350 |
}
|
|
1351 |
}
|
|
1352 |
}
|
|
1353 |
|
|
1354 |
/**
|
|
1355 |
* The timer fired, perform autoscroll if the pointer is within the
|
|
1356 |
* autoscroll region.
|
|
1357 |
* <P>
|
|
1358 |
* @param e the <code>ActionEvent</code>
|
|
1359 |
*/
|
|
1360 |
public void actionPerformed(ActionEvent e) {
|
|
1361 |
updateAutoscrollRegion((JComponent)component);
|
|
1362 |
if (outer.contains(lastPosition) && !inner.contains(lastPosition)) {
|
|
1363 |
autoscroll((JComponent)component, lastPosition);
|
|
1364 |
}
|
|
1365 |
}
|
|
1366 |
|
|
1367 |
// --- DropTargetListener methods -----------------------------------
|
|
1368 |
|
|
1369 |
private void setComponentDropLocation(TransferSupport support,
|
|
1370 |
boolean forDrop) {
|
|
1371 |
|
|
1372 |
DropLocation dropLocation = (support == null)
|
|
1373 |
? null
|
|
1374 |
: support.getDropLocation();
|
|
1375 |
|
|
1376 |
if (component instanceof JTextComponent) {
|
|
1377 |
try {
|
|
1378 |
AccessibleMethod method =
|
|
1379 |
new AccessibleMethod(JTextComponent.class,
|
|
1380 |
"setDropLocation",
|
|
1381 |
DropLocation.class,
|
|
1382 |
Object.class,
|
|
1383 |
Boolean.TYPE);
|
|
1384 |
|
|
1385 |
state =
|
|
1386 |
method.invokeNoChecked(component, dropLocation,
|
|
1387 |
state, forDrop);
|
|
1388 |
} catch (NoSuchMethodException e) {
|
|
1389 |
throw new AssertionError(
|
|
1390 |
"Couldn't locate method JTextComponet.setDropLocation");
|
|
1391 |
}
|
|
1392 |
} else if (component instanceof JComponent) {
|
|
1393 |
state = ((JComponent)component).setDropLocation(dropLocation, state, forDrop);
|
|
1394 |
}
|
|
1395 |
}
|
|
1396 |
|
|
1397 |
private void handleDrag(DropTargetDragEvent e) {
|
|
1398 |
TransferHandler importer =
|
|
1399 |
((HasGetTransferHandler)component).getTransferHandler();
|
|
1400 |
|
|
1401 |
if (importer == null) {
|
|
1402 |
e.rejectDrag();
|
|
1403 |
setComponentDropLocation(null, false);
|
|
1404 |
return;
|
|
1405 |
}
|
|
1406 |
|
|
1407 |
support.setDNDVariables(component, e);
|
|
1408 |
boolean canImport = importer.canImport(support);
|
|
1409 |
|
|
1410 |
if (canImport) {
|
|
1411 |
e.acceptDrag(support.getDropAction());
|
|
1412 |
} else {
|
|
1413 |
e.rejectDrag();
|
|
1414 |
}
|
|
1415 |
|
|
1416 |
boolean showLocation = support.showDropLocationIsSet ?
|
|
1417 |
support.showDropLocation :
|
|
1418 |
canImport;
|
|
1419 |
|
|
1420 |
setComponentDropLocation(showLocation ? support : null, false);
|
|
1421 |
}
|
|
1422 |
|
|
1423 |
public void dragEnter(DropTargetDragEvent e) {
|
|
1424 |
state = null;
|
|
1425 |
component = e.getDropTargetContext().getComponent();
|
|
1426 |
|
|
1427 |
handleDrag(e);
|
|
1428 |
|
|
1429 |
if (component instanceof JComponent) {
|
|
1430 |
lastPosition = e.getLocation();
|
|
1431 |
updateAutoscrollRegion((JComponent)component);
|
|
1432 |
initPropertiesIfNecessary();
|
|
1433 |
}
|
|
1434 |
}
|
|
1435 |
|
|
1436 |
public void dragOver(DropTargetDragEvent e) {
|
|
1437 |
handleDrag(e);
|
|
1438 |
|
|
1439 |
if (!(component instanceof JComponent)) {
|
|
1440 |
return;
|
|
1441 |
}
|
|
1442 |
|
|
1443 |
Point p = e.getLocation();
|
|
1444 |
|
|
1445 |
if (Math.abs(p.x - lastPosition.x) > hysteresis
|
|
1446 |
|| Math.abs(p.y - lastPosition.y) > hysteresis) {
|
|
1447 |
// no autoscroll
|
|
1448 |
if (timer.isRunning()) timer.stop();
|
|
1449 |
} else {
|
|
1450 |
if (!timer.isRunning()) timer.start();
|
|
1451 |
}
|
|
1452 |
|
|
1453 |
lastPosition = p;
|
|
1454 |
}
|
|
1455 |
|
|
1456 |
public void dragExit(DropTargetEvent e) {
|
|
1457 |
cleanup(false);
|
|
1458 |
}
|
|
1459 |
|
|
1460 |
public void drop(DropTargetDropEvent e) {
|
|
1461 |
TransferHandler importer =
|
|
1462 |
((HasGetTransferHandler)component).getTransferHandler();
|
|
1463 |
|
|
1464 |
if (importer == null) {
|
|
1465 |
e.rejectDrop();
|
|
1466 |
cleanup(false);
|
|
1467 |
return;
|
|
1468 |
}
|
|
1469 |
|
|
1470 |
support.setDNDVariables(component, e);
|
|
1471 |
boolean canImport = importer.canImport(support);
|
|
1472 |
|
|
1473 |
if (canImport) {
|
|
1474 |
e.acceptDrop(support.getDropAction());
|
|
1475 |
|
|
1476 |
boolean showLocation = support.showDropLocationIsSet ?
|
|
1477 |
support.showDropLocation :
|
|
1478 |
canImport;
|
|
1479 |
|
|
1480 |
setComponentDropLocation(showLocation ? support : null, false);
|
|
1481 |
|
|
1482 |
boolean success;
|
|
1483 |
|
|
1484 |
try {
|
|
1485 |
success = importer.importData(support);
|
|
1486 |
} catch (RuntimeException re) {
|
|
1487 |
success = false;
|
|
1488 |
}
|
|
1489 |
|
|
1490 |
e.dropComplete(success);
|
|
1491 |
cleanup(success);
|
|
1492 |
} else {
|
|
1493 |
e.rejectDrop();
|
|
1494 |
cleanup(false);
|
|
1495 |
}
|
|
1496 |
}
|
|
1497 |
|
|
1498 |
public void dropActionChanged(DropTargetDragEvent e) {
|
|
1499 |
/*
|
|
1500 |
* Work-around for Linux bug where dropActionChanged
|
|
1501 |
* is called before dragEnter.
|
|
1502 |
*/
|
|
1503 |
if (component == null) {
|
|
1504 |
return;
|
|
1505 |
}
|
|
1506 |
|
|
1507 |
handleDrag(e);
|
|
1508 |
}
|
|
1509 |
|
|
1510 |
private void cleanup(boolean forDrop) {
|
|
1511 |
setComponentDropLocation(null, forDrop);
|
|
1512 |
if (component instanceof JComponent) {
|
|
1513 |
((JComponent)component).dndDone();
|
|
1514 |
}
|
|
1515 |
|
|
1516 |
if (timer != null) {
|
|
1517 |
timer.stop();
|
|
1518 |
}
|
|
1519 |
|
|
1520 |
state = null;
|
|
1521 |
component = null;
|
|
1522 |
lastPosition = null;
|
|
1523 |
}
|
|
1524 |
}
|
|
1525 |
|
|
1526 |
/**
|
|
1527 |
* This is the default drag handler for drag and drop operations that
|
|
1528 |
* use the <code>TransferHandler</code>.
|
|
1529 |
*/
|
|
1530 |
private static class DragHandler implements DragGestureListener, DragSourceListener {
|
|
1531 |
|
|
1532 |
private boolean scrolls;
|
|
1533 |
|
|
1534 |
// --- DragGestureListener methods -----------------------------------
|
|
1535 |
|
|
1536 |
/**
|
|
1537 |
* a Drag gesture has been recognized
|
|
1538 |
*/
|
|
1539 |
public void dragGestureRecognized(DragGestureEvent dge) {
|
|
1540 |
JComponent c = (JComponent) dge.getComponent();
|
|
1541 |
TransferHandler th = c.getTransferHandler();
|
|
1542 |
Transferable t = th.createTransferable(c);
|
|
1543 |
if (t != null) {
|
|
1544 |
scrolls = c.getAutoscrolls();
|
|
1545 |
c.setAutoscrolls(false);
|
|
1546 |
try {
|
|
1547 |
dge.startDrag(null, t, this);
|
|
1548 |
return;
|
|
1549 |
} catch (RuntimeException re) {
|
|
1550 |
c.setAutoscrolls(scrolls);
|
|
1551 |
}
|
|
1552 |
}
|
|
1553 |
|
|
1554 |
th.exportDone(c, t, NONE);
|
|
1555 |
}
|
|
1556 |
|
|
1557 |
// --- DragSourceListener methods -----------------------------------
|
|
1558 |
|
|
1559 |
/**
|
|
1560 |
* as the hotspot enters a platform dependent drop site
|
|
1561 |
*/
|
|
1562 |
public void dragEnter(DragSourceDragEvent dsde) {
|
|
1563 |
}
|
|
1564 |
|
|
1565 |
/**
|
|
1566 |
* as the hotspot moves over a platform dependent drop site
|
|
1567 |
*/
|
|
1568 |
public void dragOver(DragSourceDragEvent dsde) {
|
|
1569 |
}
|
|
1570 |
|
|
1571 |
/**
|
|
1572 |
* as the hotspot exits a platform dependent drop site
|
|
1573 |
*/
|
|
1574 |
public void dragExit(DragSourceEvent dsde) {
|
|
1575 |
}
|
|
1576 |
|
|
1577 |
/**
|
|
1578 |
* as the operation completes
|
|
1579 |
*/
|
|
1580 |
public void dragDropEnd(DragSourceDropEvent dsde) {
|
|
1581 |
DragSourceContext dsc = dsde.getDragSourceContext();
|
|
1582 |
JComponent c = (JComponent)dsc.getComponent();
|
|
1583 |
if (dsde.getDropSuccess()) {
|
|
1584 |
c.getTransferHandler().exportDone(c, dsc.getTransferable(), dsde.getDropAction());
|
|
1585 |
} else {
|
|
1586 |
c.getTransferHandler().exportDone(c, dsc.getTransferable(), NONE);
|
|
1587 |
}
|
|
1588 |
c.setAutoscrolls(scrolls);
|
|
1589 |
}
|
|
1590 |
|
|
1591 |
public void dropActionChanged(DragSourceDragEvent dsde) {
|
|
1592 |
}
|
|
1593 |
}
|
|
1594 |
|
|
1595 |
private static class SwingDragGestureRecognizer extends DragGestureRecognizer {
|
|
1596 |
|
|
1597 |
SwingDragGestureRecognizer(DragGestureListener dgl) {
|
|
1598 |
super(DragSource.getDefaultDragSource(), null, NONE, dgl);
|
|
1599 |
}
|
|
1600 |
|
|
1601 |
void gestured(JComponent c, MouseEvent e, int srcActions, int action) {
|
|
1602 |
setComponent(c);
|
|
1603 |
setSourceActions(srcActions);
|
|
1604 |
appendEvent(e);
|
|
1605 |
fireDragGestureRecognized(action, e.getPoint());
|
|
1606 |
}
|
|
1607 |
|
|
1608 |
/**
|
|
1609 |
* register this DragGestureRecognizer's Listeners with the Component
|
|
1610 |
*/
|
|
1611 |
protected void registerListeners() {
|
|
1612 |
}
|
|
1613 |
|
|
1614 |
/**
|
|
1615 |
* unregister this DragGestureRecognizer's Listeners with the Component
|
|
1616 |
*
|
|
1617 |
* subclasses must override this method
|
|
1618 |
*/
|
|
1619 |
protected void unregisterListeners() {
|
|
1620 |
}
|
|
1621 |
|
|
1622 |
}
|
|
1623 |
|
|
1624 |
static final Action cutAction = new TransferAction("cut");
|
|
1625 |
static final Action copyAction = new TransferAction("copy");
|
|
1626 |
static final Action pasteAction = new TransferAction("paste");
|
|
1627 |
|
|
1628 |
static class TransferAction extends UIAction implements UIResource {
|
|
1629 |
|
|
1630 |
TransferAction(String name) {
|
|
1631 |
super(name);
|
|
1632 |
}
|
|
1633 |
|
|
1634 |
public boolean isEnabled(Object sender) {
|
|
1635 |
if (sender instanceof JComponent
|
|
1636 |
&& ((JComponent)sender).getTransferHandler() == null) {
|
|
1637 |
return false;
|
|
1638 |
}
|
|
1639 |
|
|
1640 |
return true;
|
|
1641 |
}
|
|
1642 |
|
|
1643 |
public void actionPerformed(ActionEvent e) {
|
|
1644 |
Object src = e.getSource();
|
|
1645 |
if (src instanceof JComponent) {
|
|
1646 |
JComponent c = (JComponent) src;
|
|
1647 |
TransferHandler th = c.getTransferHandler();
|
|
1648 |
Clipboard clipboard = getClipboard(c);
|
|
1649 |
String name = (String) getValue(Action.NAME);
|
|
1650 |
|
|
1651 |
Transferable trans = null;
|
|
1652 |
|
|
1653 |
// any of these calls may throw IllegalStateException
|
|
1654 |
try {
|
|
1655 |
if ((clipboard != null) && (th != null) && (name != null)) {
|
|
1656 |
if ("cut".equals(name)) {
|
|
1657 |
th.exportToClipboard(c, clipboard, MOVE);
|
|
1658 |
} else if ("copy".equals(name)) {
|
|
1659 |
th.exportToClipboard(c, clipboard, COPY);
|
|
1660 |
} else if ("paste".equals(name)) {
|
|
1661 |
trans = clipboard.getContents(null);
|
|
1662 |
}
|
|
1663 |
}
|
|
1664 |
} catch (IllegalStateException ise) {
|
|
1665 |
// clipboard was unavailable
|
|
1666 |
UIManager.getLookAndFeel().provideErrorFeedback(c);
|
|
1667 |
return;
|
|
1668 |
}
|
|
1669 |
|
|
1670 |
// this is a paste action, import data into the component
|
|
1671 |
if (trans != null) {
|
|
1672 |
th.importData(new TransferSupport(c, trans));
|
|
1673 |
}
|
|
1674 |
}
|
|
1675 |
}
|
|
1676 |
|
|
1677 |
/**
|
|
1678 |
* Returns the clipboard to use for cut/copy/paste.
|
|
1679 |
*/
|
|
1680 |
private Clipboard getClipboard(JComponent c) {
|
|
1681 |
if (SwingUtilities2.canAccessSystemClipboard()) {
|
|
1682 |
return c.getToolkit().getSystemClipboard();
|
|
1683 |
}
|
|
1684 |
Clipboard clipboard = (Clipboard)sun.awt.AppContext.getAppContext().
|
|
1685 |
get(SandboxClipboardKey);
|
|
1686 |
if (clipboard == null) {
|
|
1687 |
clipboard = new Clipboard("Sandboxed Component Clipboard");
|
|
1688 |
sun.awt.AppContext.getAppContext().put(SandboxClipboardKey,
|
|
1689 |
clipboard);
|
|
1690 |
}
|
|
1691 |
return clipboard;
|
|
1692 |
}
|
|
1693 |
|
|
1694 |
/**
|
|
1695 |
* Key used in app context to lookup Clipboard to use if access to
|
|
1696 |
* System clipboard is denied.
|
|
1697 |
*/
|
|
1698 |
private static Object SandboxClipboardKey = new Object();
|
|
1699 |
|
|
1700 |
}
|
|
1701 |
|
|
1702 |
}
|