com.google.gwt.animation.client.AnimationSchedulerImplMozilla Maven / Gradle / Ivy
/*
* Copyright 2011 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.animation.client;
import com.google.gwt.dom.client.Element;
/**
* Implementation using mozRequestAnimationFrame.
*
* @see
* Documentation on the MDN
*/
class AnimationSchedulerImplMozilla extends AnimationSchedulerImpl {
/**
* Mozilla implementation of {@link AnimationScheduler.AnimationHandle}.
* Mozilla does not provide a request ID, so we mark a boolean in the handle
* and check it in the callback wrapper.
*/
private class AnimationHandleImpl extends AnimationHandle {
@SuppressWarnings("unused")
private boolean canceled;
@Override
public void cancel() {
canceled = true;
}
}
@Override
public AnimationHandle requestAnimationFrame(AnimationCallback callback, Element element) {
AnimationHandleImpl handle = new AnimationHandleImpl();
requestAnimationFrameImpl(callback, handle);
return handle;
}
@Override
protected native boolean isNativelySupported() /*-{
return !!$wnd.mozRequestAnimationFrame;
}-*/;
/**
* Request an animation frame. Firefox does not return a request ID, so we
* create a JavaScriptObject and add an expando named "canceled" to inidicate
* if the request was canceled. The callback wrapper checks the expando before
* executing the user callback.
*
* @param callback the user callback to execute
* @param handle the handle object
*/
private native void requestAnimationFrameImpl(AnimationCallback callback,
AnimationHandleImpl handle) /*-{
var wrapper = $entry(function() {
if (!handle.@com.google.gwt.animation.client.AnimationSchedulerImplMozilla.AnimationHandleImpl::canceled) {
// Older versions of firefox pass the current timestamp, but the spec has changed to pass a
// high resolution timer instead, and newer versions of Firefox will eventually change.
var now = @com.google.gwt.core.client.Duration::currentTimeMillis()();
callback.@com.google.gwt.animation.client.AnimationScheduler.AnimationCallback::execute(D)(now);
}
});
$wnd.mozRequestAnimationFrame(wrapper);
}-*/;
}