/*
* Copyright 2008 Google Inc.
*
* 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.google.gwt.topspin.iphone.client;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.events.client.Event;
import com.google.gwt.events.client.EventListener;
import com.google.gwt.events.client.EventListenerRemover;
import com.google.gwt.topspin.ui.client.NativeEvent;
/**
* An event fired when a touch starts within a widget.
*
* This event represents the native 'ontouchstart' event.
*
* TODO(jgw): Add support for the 'touches', 'targetTouches', and
* 'changedTouches' collections.
*/
public class TouchStartEvent extends NativeEvent {
public static final String NAME = "touchstart";
/**
* Adds a touch-start listener to the given native object.
*
* @param source the associated event source
* @param nativeSource the native object that will fire the event
* @param listener the listener to be notified of the event
* @return a handle that may be used to remove this listener
*/
public static EventListenerRemover addTouchStartListener(final Object source,
JavaScriptObject nativeSource, final TouchStartListener listener) {
return Event.addEventListener(TouchStartEvent.NAME, nativeSource,
new EventListener() {
public void handleEvent(Event event) {
listener.onTouchStart(new TouchStartEvent(source, event));
}
});
}
/**
* Creates a new touch-start event with the given source and browser event.
*
* @param sender the event source
* @param nativeEvent the browser event
*/
public TouchStartEvent(Object sender, Event nativeEvent) {
super(sender, nativeEvent);
}
/**
* Gets the x position of the touch.
*/
public int getClientX() {
return getClientX(getNativeEvent());
}
/**
* Gets the y position of the touch.
*/
public int getClientY() {
return getClientY(getNativeEvent());
}
private native int getClientX(Event nativeEvent) /*-{
var touches = nativeEvent.touches;
var lastTouch = touches.item(touches.length-1);
return lastTouch.clientX;
}-*/;
private native int getClientY(Event nativeEvent) /*-{
var touches = nativeEvent.touches;
var lastTouch = touches.item(touches.length-1);
return lastTouch.clientY;
}-*/;
}