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327 lines
11 KiB
Java
327 lines
11 KiB
Java
/* DragSource.java --
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.dnd;
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import gnu.classpath.NotImplementedException;
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import java.awt.Component;
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import java.awt.Cursor;
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import java.awt.GraphicsEnvironment;
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import java.awt.HeadlessException;
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import java.awt.Image;
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import java.awt.Point;
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import java.awt.Toolkit;
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import java.awt.datatransfer.FlavorMap;
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import java.awt.datatransfer.SystemFlavorMap;
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import java.awt.datatransfer.Transferable;
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import java.awt.dnd.peer.DragSourceContextPeer;
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import java.io.Serializable;
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import java.util.EventListener;
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/**
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* @since 1.2
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*/
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public class DragSource implements Serializable
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{
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/**
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* Compatible with JDK 1.2+.
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*/
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private static final long serialVersionUID = 6236096958971414066L;
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public static final Cursor DefaultCopyDrop = null;
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public static final Cursor DefaultMoveDrop = null;
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public static final Cursor DefaultLinkDrop = null;
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public static final Cursor DefaultCopyNoDrop = null;
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public static final Cursor DefaultMoveNoDrop = null;
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public static final Cursor DefaultLinkNoDrop = null;
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private transient FlavorMap flavorMap = SystemFlavorMap.getDefaultFlavorMap ();
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private transient DragSourceListener dragSourceListener;
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private transient DragSourceMotionListener dragSourceMotionListener;
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private static DragSource ds;
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private DragSourceContextPeer peer;
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private DragSourceContext context;
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/**
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* Initializes the drag source.
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*
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* @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
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*/
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public DragSource()
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{
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if (GraphicsEnvironment.isHeadless())
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{
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ds = null;
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throw new HeadlessException();
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}
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}
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/**
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* Gets the default drag source.
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*
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* @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
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*/
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public static DragSource getDefaultDragSource()
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{
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if (GraphicsEnvironment.isHeadless())
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{
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ds = null;
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throw new HeadlessException();
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}
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if (ds == null)
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ds = new DragSource();
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return ds;
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}
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public static boolean isDragImageSupported()
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{
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// In all cases, Sun returns false here.
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return false;
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}
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/**
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* Start a drag, given the DragGestureEvent that initiated the drag.
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*
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* @exception InvalidDnDOperationException If the Drag and Drop system is
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* unable to initiate a drag operation, or if the user attempts to start
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* a drag while an existing drag operation is still executing.
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*/
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public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
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Image dragImage, Point imageOffset,
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Transferable trans, DragSourceListener dsl,
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FlavorMap map)
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{
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// http://www.javaworld.com/javaworld/jw-03-1999/jw-03-dragndrop.html
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// This function creates a DragSourceContext object. This object tracks the
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// state of the operation by listening to a native peer. In this situation,
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// the DragSource may be obtained from the event or by an instance variable.
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// This function also creates a new DragSourceContextPeer.
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// This function sends the same message to the context, which then forwards
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// it to the peer, passing itself as a parameter. Now, the native system has
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// access to the Transferable through the context.
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try
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{
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flavorMap = map;
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if (peer == null)
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peer = Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);
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if (context == null)
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context = createDragSourceContext(peer, trigger,
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dragCursor,
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dragImage,
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imageOffset, trans,
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dsl);
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if (peer == null)
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throw new InvalidDnDOperationException();
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peer.startDrag(context, dragCursor, dragImage, imageOffset);
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}
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catch (Exception e)
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{
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throw new InvalidDnDOperationException("Drag and Drop system is "
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+ "unable to initiate a drag operation.");
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}
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}
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/**
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* Start a drag, given the DragGestureEvent that initiated the drag.
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*
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* @exception InvalidDnDOperationException If the Drag and Drop system is
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* unable to initiate a drag operation, or if the user attempts to start
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* a drag while an existing drag operation is still executing.
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*/
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public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
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Transferable trans, DragSourceListener dsl,
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FlavorMap map)
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{
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startDrag(trigger, dragCursor, null, null, trans, dsl, map);
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}
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/**
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* Start a drag, given the DragGestureEvent that initiated the drag.
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*
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* @exception InvalidDnDOperationException If the Drag and Drop system is
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* unable to initiate a drag operation, or if the user attempts to start
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* a drag while an existing drag operation is still executing.
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*/
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public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
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Image dragImage, Point imageOffset,
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Transferable trans, DragSourceListener dsl)
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{
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startDrag(trigger, dragCursor, dragImage, imageOffset, trans, dsl, null);
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}
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/**
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* Start a drag, given the DragGestureEvent that initiated the drag.
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*
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* @exception InvalidDnDOperationException If the Drag and Drop system is
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* unable to initiate a drag operation, or if the user attempts to start
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* a drag while an existing drag operation is still executing.
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*/
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public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
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Transferable trans, DragSourceListener dsl)
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{
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startDrag(trigger, dragCursor, null, null, trans, dsl, null);
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}
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/**
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* Creates the DragSourceContext to handle this drag.
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*
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* @exception IllegalArgumentException
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* @exception NullPointerException If dscp, dgl, dragImage or t is null.
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*/
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protected DragSourceContext
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createDragSourceContext(DragSourceContextPeer peer, DragGestureEvent dge,
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Cursor cursor, Image image, Point offset,
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Transferable t, DragSourceListener dsl)
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{
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return new DragSourceContext(peer, dge, cursor, image, offset, t, dsl);
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}
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public FlavorMap getFlavorMap()
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{
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return flavorMap;
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}
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public <T extends DragGestureRecognizer> T
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createDragGestureRecognizer(Class<T> recognizer,
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Component c,
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int actions,
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DragGestureListener dgl)
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{
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return (T) Toolkit.getDefaultToolkit().createDragGestureRecognizer(recognizer,
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this, c,
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actions, dgl);
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}
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public DragGestureRecognizer createDefaultDragGestureRecognizer(Component c,
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int actions,
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DragGestureListener dgl)
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{
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return createDragGestureRecognizer(MouseDragGestureRecognizer.class, c,
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actions, dgl);
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}
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/**
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* @since 1.4
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*/
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public void addDragSourceListener(DragSourceListener l)
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{
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DnDEventMulticaster.add (dragSourceListener, l);
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}
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/**
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* @since 1.4
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*/
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public void removeDragSourceListener(DragSourceListener l)
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{
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DnDEventMulticaster.remove (dragSourceListener, l);
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}
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/**
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* @since 1.4
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*/
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public DragSourceListener[] getDragSourceListeners()
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{
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return (DragSourceListener[]) getListeners (DragSourceListener.class);
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}
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/**
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* @since 1.4
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*/
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public void addDragSourceMotionListener(DragSourceMotionListener l)
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{
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DnDEventMulticaster.add (dragSourceMotionListener, l);
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}
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/**
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* @since 1.4
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*/
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public void removeDragSourceMotionListener(DragSourceMotionListener l)
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{
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DnDEventMulticaster.remove (dragSourceMotionListener, l);
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}
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/**
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* @since 1.4
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*/
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public DragSourceMotionListener[] getDragSourceMotionListeners ()
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{
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return (DragSourceMotionListener[]) getListeners
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(DragSourceMotionListener.class);
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}
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/**
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* @since 1.4
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*/
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public <T extends EventListener> T[] getListeners (Class<T> listenerType)
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{
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if (listenerType == DragSourceListener.class)
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return DnDEventMulticaster.getListeners (dragSourceListener,
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listenerType);
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if (listenerType == DragSourceMotionListener.class)
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return DnDEventMulticaster.getListeners (dragSourceMotionListener,
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listenerType);
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// Return an empty EventListener array.
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return (T[]) new EventListener [0];
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}
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/**
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* TODO
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* @return TODO
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*
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* @since 1.5
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*/
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public static int getDragThreshold()
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throws NotImplementedException
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{
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// FIXME: Not implemented.
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return 8;
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}
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} // class DragSource
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