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