/**
* Copyright 2010 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.livingstories.client.ui;
import com.google.gwt.dom.client.BodyElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.SimplePanel;
/**
* Semitransparent overlay that dims that page for dialog boxes and lightboxes.
*
* There's an existing GlassPanel implementation in gwt-incubator, but this is
* a tinier version that is sufficient for our needs.
*/
public class GlassPanel extends Composite {
private SimplePanel glass;
private Timer timer;
public GlassPanel() {
glass = new SimplePanel();
glass.setStylePrimaryName("fixedGlass");
Element element = glass.getElement();
DOM.setStyleAttribute(element, "backgroundColor", "#000000");
DOM.setStyleAttribute(element, "opacity", "0.50");
DOM.setStyleAttribute(element, "MozOpacity", "0.50");
DOM.setStyleAttribute(element, "filter", "alpha(opacity=50)");
glass.setVisible(false);
initWidget(glass);
Window.addResizeHandler(new ResizeHandler() {
@Override
public void onResize(ResizeEvent event) {
if (isVisible()) {
sizeToDocument();
if (timer != null) {
timer.cancel();
}
// We need to call sizeToDocument() a second time, asynchronously, to get inappropriate
// scrollbars to disappear when making the window smaller. We do this with a small
// timeout, though, so as not to repeatedly call extra sizeToDocument over
// the course of a drag.
timer = new Timer() {
@Override
public void run() {
// the size actually has to change to get the layout to reflow...
glass.setSize("1px", "1px");
sizeToDocument();
timer = null;
}
};
timer.schedule(100);
}
}
});
}
@Override
public void setVisible(boolean visible) {
if (visible) {
sizeToDocument();
}
super.setVisible(visible);
}
private void sizeToDocument() {
BodyElement body = Document.get().getBody();
glass.setSize(body.getScrollWidth() + "px", body.getScrollHeight() + "px");
}
}