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