/************************************************************************
RenderHandler.java is part of Touch4j 4.2.2.1 Copyright 2013 Emitrom LLC
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 com.emitrom.touch4j.client.core.handlers.component;
import com.emitrom.touch4j.client.core.Component;
import com.emitrom.touch4j.client.core.handlers.AbstractHandler;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.GWT.UncaughtExceptionHandler;
import com.google.gwt.core.client.JavaScriptObject;
public abstract class RenderHandler extends AbstractHandler {
final JavaScriptObject jsoPeer = createPeer(this);
private static native JavaScriptObject createPeer(RenderHandler listener) /*-{
return function(c) {
var comp = @com.emitrom.touch4j.client.core.Component::new(Lcom/google/gwt/core/client/JavaScriptObject;)(c);
listener.@com.emitrom.touch4j.client.core.handlers.component.RenderHandler::fireOnEvent(Lcom/emitrom/touch4j/client/core/Component;)(comp);
};
}-*/;
// Called from JSNI
private final void fireOnEvent(Component comp) {
UncaughtExceptionHandler handler = GWT.getUncaughtExceptionHandler();
if (handler != null) {
fireOnEventAndCatch(comp, handler);
} else {
onRender(comp);
}
}
private void fireOnEventAndCatch(Component comp, UncaughtExceptionHandler handler) {
try {
onRender(comp);
} catch (Throwable e) {
handler.onUncaughtException(e);
}
}
@Override
public JavaScriptObject getJsoPeer() {
return jsoPeer;
}
public abstract void onRender(Component comp);
}