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/*
* Copyright 2007 Mat Gessel <mat.gessel@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package org.litesoft.GWT.client.widgets.nonpublic.external;
import com.google.gwt.core.client.*;
import com.google.gwt.user.client.*;
/**
* Converts {@link MouseEvent}s to {@link DragEvent}s and delegates to the
* specified {@link DragGesture}.
*/
public class MouseDragHandler extends MouseHandlerAdaptor
{
private static MouseDragHandlerImpl s_Impl =
(MouseDragHandlerImpl) GWT.create( MouseDragHandlerImpl.class );
private DragGesture m_dragGesture;
private MouseEvent m_mouseDown = null;
private MouseEvent m_previousEvent = null;
public MouseDragHandler( DragGesture dragGesture )
{
super( Event.ONMOUSEDOWN | Event.ONMOUSEMOVE | Event.ONMOUSEUP );
m_dragGesture = dragGesture;
}
protected MouseEvent getMouseDown()
{
return m_mouseDown;
}
protected MouseEvent getPreviousEvent()
{
return m_previousEvent;
}
/**
* Get the delegate object which will handle drag operations.
*/
public DragGesture getDragGesture()
{
return m_dragGesture;
}
/**
* Set the delegate object which will handle drag operations.
*/
public void setDragGesture( DragGesture dragGesture )
{
m_dragGesture = dragGesture;
}
public void onMouseDown( MouseEvent e )
{
DOM.eventCancelBubble( e.getDomEvent(), true );
s_Impl.onMouseDown( e.getDomEvent() );
if ( m_dragGesture != null )
{
m_mouseDown = e;
m_dragGesture.start( e );
m_previousEvent = e;
}
}
public void onMouseMove( MouseEvent e )
{
if ( m_mouseDown != null )
{
m_dragGesture.step( new DragEvent( e, m_mouseDown, m_previousEvent ) );
m_previousEvent = e;
}
}
public void onMouseUp( MouseEvent e )
{
// it is possible to get a mouse up without a mouse down
if ( m_mouseDown != null )
{
// clear MD first to prevent reentrancy
m_mouseDown = null;
m_dragGesture.finish();
m_previousEvent = null;
}
if ( e != null )
{
s_Impl.onMouseUp( e.getDomEvent() );
}
}
protected static class MouseDragHandlerImpl
{
public void onMouseDown( Event event )
{
// prevents text selection and image dragging in Mozilla, Safari & Opera
DOM.eventPreventDefault( event );
}
public void onMouseUp( Event event )
{
}
}
protected static class MouseDragHandlerImplIE6 extends MouseDragHandlerImpl
{
public native void onMouseDown( Event event ) /*-{
$doc.body.onselectstart = function() { return false; };
$doc.body.ondragstart = function() { return false; };
}-*/;
public native void onMouseUp( Event event ) /*-{
$doc.body.onselectstart = null;
$doc.body.ondragstart = null;
}-*/;
}
}
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Revision |
Author |
Commited |
Message |
2
|
GeorgeS
|
Sun 07 Feb, 2010 12:50:58 +0000 |
|