/*******************************************************************************
* Copyright (c) 2013 EclipseSource and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* EclipseSource - initial API and implementation
******************************************************************************/
package com.eclipsesource.tabris.internal;
import static com.eclipsesource.tabris.internal.Clauses.whenNull;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.rap.json.JsonObject;
import org.eclipse.rap.json.JsonValue;
import org.eclipse.rap.rwt.internal.lifecycle.ProcessActionRunner;
import org.eclipse.swt.internal.widgets.canvaskit.CanvasOperationHandler;
import org.eclipse.swt.widgets.Canvas;
import com.eclipsesource.tabris.widgets.ClientCanvas;
import com.eclipsesource.tabris.widgets.ClientDrawListener;
@SuppressWarnings("restriction")
public class ClientCanvasOperator extends CanvasOperationHandler {
public static final String DRAWING_EVENT = "Drawing";
public static final String DRAWINGS_PROPERTY = "drawings";
public ClientCanvasOperator( ClientCanvas canvas ) {
super( canvas );
whenNull( canvas ).throwIllegalArgument( "ClientCanvas must not be null" );
}
@Override
public void handleNotify( final Canvas control, String eventName, JsonObject properties ) {
if( eventName.equals( DRAWING_EVENT ) ) {
handleDrawings( control, properties );
} else {
super.handleNotify( control, eventName, properties );
}
}
private void handleDrawings( final Canvas control, final JsonObject properties ) {
ProcessActionRunner.add( new Runnable() {
@Override
public void run() {
DrawingsCache cache = control.getAdapter( DrawingsCache.class );
JsonValue drawings = properties.get( DRAWINGS_PROPERTY );
if( drawings != null ) {
cache.cache( drawings.asString() );
cache.clearRemoved();
fireDrawEvent( ( ClientCanvas )control );
}
}
} );
}
@SuppressWarnings("unchecked")
private void fireDrawEvent(ClientCanvas control) {
if( !control.isDisposed() ) {
List<ClientDrawListener> listeners = new ArrayList<ClientDrawListener>( control.getAdapter( List.class ) );
for( ClientDrawListener listener : listeners ) {
listener.receivedDrawing();
}
}
}
}