mirror of git://gcc.gnu.org/git/gcc.git
384 lines
11 KiB
Java
384 lines
11 KiB
Java
/* DragSourceContext.java --
|
|
Copyright (C) 2002 Free Software Foundation
|
|
|
|
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 java.awt.Component;
|
|
import java.awt.Cursor;
|
|
import java.awt.Image;
|
|
import java.awt.Point;
|
|
import java.awt.datatransfer.Transferable;
|
|
import java.awt.dnd.peer.DragSourceContextPeer;
|
|
import java.io.Serializable;
|
|
import java.util.TooManyListenersException;
|
|
|
|
/**
|
|
* @since 1.2
|
|
*/
|
|
public class DragSourceContext
|
|
implements DragSourceListener, DragSourceMotionListener, Serializable
|
|
{
|
|
/**
|
|
* Compatible with JDK 1.2+
|
|
*/
|
|
static final long serialVersionUID = -115407898692194719L;
|
|
|
|
protected static final int DEFAULT = 0;
|
|
protected static final int ENTER = 1;
|
|
protected static final int OVER = 2;
|
|
protected static final int CHANGED = 3;
|
|
|
|
private DragSourceContextPeer peer;
|
|
private Cursor cursor;
|
|
private Transferable transferable;
|
|
private DragGestureEvent trigger;
|
|
private DragSourceListener dragSourceListener;
|
|
private boolean useCustomCursor;
|
|
private int sourceActions;
|
|
private Image image;
|
|
private Point offset;
|
|
|
|
/**
|
|
* Initializes a drag source context.
|
|
*
|
|
* @exception IllegalArgumentException If Component or DragSource of trigger
|
|
* are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
|
|
* or if the source actions for the DragGestureRecognizer associated with the
|
|
* trigger event are equal to DnDConstants.ACTION_NONE.
|
|
* @exception NullPointerException If peer, trans or trigger is null or if the
|
|
* image is not null but the offset is.
|
|
*/
|
|
public DragSourceContext (DragSourceContextPeer peer,
|
|
DragGestureEvent trigger, Cursor cursor,
|
|
Image image, Point offset, Transferable trans,
|
|
DragSourceListener dsl)
|
|
{
|
|
if (peer == null
|
|
|| trigger == null || trans == null
|
|
|| (image != null && offset == null))
|
|
throw new NullPointerException ();
|
|
|
|
if (trigger.getComponent () == null
|
|
|| trigger.getDragSource () == null
|
|
|| trigger.getDragAction () == DnDConstants.ACTION_NONE
|
|
|| trigger.getSourceAsDragGestureRecognizer ()
|
|
.getSourceActions () == DnDConstants.ACTION_NONE)
|
|
throw new IllegalArgumentException ();
|
|
|
|
this.peer = peer;
|
|
this.trigger = trigger;
|
|
this.cursor = cursor;
|
|
this.image = image;
|
|
this.offset = offset;
|
|
this.transferable = trans;
|
|
this.dragSourceListener = dsl;
|
|
this.sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();
|
|
|
|
setCursor(cursor);
|
|
updateCurrentCursor(trigger.getDragAction(), sourceActions, DEFAULT);
|
|
}
|
|
|
|
/**
|
|
* Returns the DragSource object associated with the
|
|
* DragGestureEvent.
|
|
*
|
|
* @return the DragSource associated with the trigger.
|
|
*/
|
|
public DragSource getDragSource()
|
|
{
|
|
return trigger.getDragSource ();
|
|
}
|
|
|
|
/**
|
|
* Returns the component associated with this.
|
|
*
|
|
* @return the component associated with the trigger.
|
|
*/
|
|
public Component getComponent()
|
|
{
|
|
return trigger.getComponent ();
|
|
}
|
|
|
|
/**
|
|
* Gets the trigger associated with this.
|
|
*
|
|
* @return the trigger.
|
|
*/
|
|
public DragGestureEvent getTrigger()
|
|
{
|
|
return trigger;
|
|
}
|
|
|
|
/**
|
|
* Returns the source actions for the DragGestureRecognizer.
|
|
*
|
|
* @return the source actions for DragGestureRecognizer.
|
|
*/
|
|
public int getSourceActions()
|
|
{
|
|
if (sourceActions == 0)
|
|
sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();
|
|
return sourceActions;
|
|
}
|
|
|
|
/**
|
|
* Sets the cursor for this drag operation to the specified cursor.
|
|
*
|
|
* @param cursor c - the Cursor to use, or null to use the default drag
|
|
* cursor.
|
|
*/
|
|
public void setCursor(Cursor cursor)
|
|
{
|
|
if (cursor == null)
|
|
useCustomCursor = false;
|
|
else
|
|
useCustomCursor = true;
|
|
this.cursor = cursor;
|
|
peer.setCursor(cursor);
|
|
}
|
|
|
|
/**
|
|
* Returns the current cursor or null if the default
|
|
* drag cursor is used.
|
|
*
|
|
* @return the current cursor or null.
|
|
*/
|
|
public Cursor getCursor()
|
|
{
|
|
return cursor;
|
|
}
|
|
|
|
/**
|
|
* Adds a <code>DragSourceListener</code>.
|
|
*
|
|
* @exception TooManyListenersException If a <code>DragSourceListener</code>
|
|
* has already been added.
|
|
*/
|
|
public void addDragSourceListener (DragSourceListener dsl)
|
|
throws TooManyListenersException
|
|
{
|
|
if (dragSourceListener != null)
|
|
throw new TooManyListenersException ();
|
|
|
|
dragSourceListener = dsl;
|
|
}
|
|
|
|
public void removeDragSourceListener (DragSourceListener dsl)
|
|
{
|
|
if (dragSourceListener == dsl)
|
|
dragSourceListener = null;
|
|
}
|
|
|
|
/**
|
|
* This function tells the peer that the DataFlavors have been modified.
|
|
*/
|
|
public void transferablesFlavorsChanged()
|
|
{
|
|
peer.transferablesFlavorsChanged();
|
|
}
|
|
|
|
/**
|
|
* Calls dragEnter on the listeners registered with this
|
|
* and with the DragSource.
|
|
*
|
|
* @param e - the DragSourceDragEvent
|
|
*/
|
|
public void dragEnter(DragSourceDragEvent e)
|
|
{
|
|
if (dragSourceListener != null)
|
|
dragSourceListener.dragEnter(e);
|
|
|
|
DragSource ds = getDragSource();
|
|
DragSourceListener[] dsl = ds.getDragSourceListeners();
|
|
for (int i = 0; i < dsl.length; i++)
|
|
dsl[i].dragEnter(e);
|
|
|
|
updateCurrentCursor(e.getDropAction(), e.getTargetActions(), ENTER);
|
|
}
|
|
|
|
/**
|
|
* Calls dragOver on the listeners registered with this
|
|
* and with the DragSource.
|
|
*
|
|
* @param e - the DragSourceDragEvent
|
|
*/
|
|
public void dragOver(DragSourceDragEvent e)
|
|
{
|
|
if (dragSourceListener != null)
|
|
dragSourceListener.dragOver(e);
|
|
|
|
DragSource ds = getDragSource();
|
|
DragSourceListener[] dsl = ds.getDragSourceListeners();
|
|
for (int i = 0; i < dsl.length; i++)
|
|
dsl[i].dragOver(e);
|
|
|
|
updateCurrentCursor(e.getDropAction(), e.getTargetActions(), OVER);
|
|
}
|
|
|
|
/**
|
|
* Calls dragExit on the listeners registered with this
|
|
* and with the DragSource.
|
|
*
|
|
* @param e - the DragSourceEvent
|
|
*/
|
|
public void dragExit(DragSourceEvent e)
|
|
{
|
|
if (dragSourceListener != null)
|
|
dragSourceListener.dragExit(e);
|
|
|
|
DragSource ds = getDragSource();
|
|
DragSourceListener[] dsl = ds.getDragSourceListeners();
|
|
for (int i = 0; i < dsl.length; i++)
|
|
dsl[i].dragExit(e);
|
|
|
|
updateCurrentCursor(DnDConstants.ACTION_NONE, DnDConstants.ACTION_NONE,
|
|
DEFAULT);
|
|
}
|
|
|
|
/**
|
|
* Calls dropActionChanged on the listeners registered with this
|
|
* and with the DragSource.
|
|
*
|
|
* @param e - the DragSourceDragEvent
|
|
*/
|
|
public void dropActionChanged(DragSourceDragEvent e)
|
|
{
|
|
if (dragSourceListener != null)
|
|
dragSourceListener.dropActionChanged(e);
|
|
|
|
DragSource ds = getDragSource();
|
|
DragSourceListener[] dsl = ds.getDragSourceListeners();
|
|
for (int i = 0; i < dsl.length; i++)
|
|
dsl[i].dropActionChanged(e);
|
|
|
|
updateCurrentCursor(e.getDropAction(), e.getTargetActions(), CHANGED);
|
|
}
|
|
|
|
/**
|
|
* Calls dragDropEnd on the listeners registered with this
|
|
* and with the DragSource.
|
|
*
|
|
* @param e - the DragSourceDropEvent
|
|
*/
|
|
public void dragDropEnd(DragSourceDropEvent e)
|
|
{
|
|
if (dragSourceListener != null)
|
|
dragSourceListener.dragDropEnd(e);
|
|
|
|
DragSource ds = getDragSource();
|
|
DragSourceListener[] dsl = ds.getDragSourceListeners();
|
|
for (int i = 0; i < dsl.length; i++)
|
|
dsl[i].dragDropEnd(e);
|
|
}
|
|
|
|
/**
|
|
* Calls dragMouseMoved on the listeners registered with the DragSource.
|
|
*
|
|
* @param e - the DragSourceDragEvent
|
|
*/
|
|
public void dragMouseMoved(DragSourceDragEvent e)
|
|
{
|
|
DragSource ds = getDragSource();
|
|
DragSourceMotionListener[] dsml = ds.getDragSourceMotionListeners();
|
|
for (int i = 0; i < dsml.length; i++)
|
|
dsml[i].dragMouseMoved(e);
|
|
}
|
|
|
|
/**
|
|
* Returns the Transferable set with this object.
|
|
*
|
|
* @return the transferable.
|
|
*/
|
|
public Transferable getTransferable()
|
|
{
|
|
return transferable;
|
|
}
|
|
|
|
/**
|
|
* This function sets the drag cursor for the specified operation, actions and
|
|
* status if the default drag cursor is active. Otherwise, the cursor is not
|
|
* updated in any way.
|
|
*
|
|
* @param dropOp - the current operation.
|
|
* @param targetAct - the supported actions.
|
|
* @param status - the status of the cursor (constant).
|
|
*/
|
|
protected void updateCurrentCursor(int dropOp, int targetAct, int status)
|
|
{
|
|
if (! useCustomCursor)
|
|
{
|
|
Cursor newCursor = null;
|
|
switch (status)
|
|
{
|
|
default:
|
|
targetAct = DnDConstants.ACTION_NONE;
|
|
case ENTER:
|
|
case CHANGED:
|
|
case OVER:
|
|
int action = dropOp & targetAct;
|
|
if (action == DnDConstants.ACTION_NONE)
|
|
{
|
|
if ((dropOp & DnDConstants.ACTION_LINK) != 0)
|
|
newCursor = DragSource.DefaultLinkNoDrop;
|
|
else if ((dropOp & DnDConstants.ACTION_MOVE) != 0)
|
|
newCursor = DragSource.DefaultMoveNoDrop;
|
|
else
|
|
newCursor = DragSource.DefaultCopyNoDrop;
|
|
}
|
|
else
|
|
{
|
|
if ((dropOp & DnDConstants.ACTION_LINK) != 0)
|
|
newCursor = DragSource.DefaultLinkDrop;
|
|
else if ((dropOp & DnDConstants.ACTION_MOVE) != 0)
|
|
newCursor = DragSource.DefaultMoveDrop;
|
|
else
|
|
newCursor = DragSource.DefaultCopyDrop;
|
|
}
|
|
}
|
|
|
|
if (cursor == null || ! cursor.equals(newCursor))
|
|
{
|
|
cursor = newCursor;
|
|
DragSourceContextPeer p = peer;
|
|
if (p != null)
|
|
p.setCursor(cursor);
|
|
}
|
|
}
|
|
}
|
|
} // class DragSourceContext
|