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// Copyright (C) 2008 The Android Open Source Project
//
// 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.gwtexpui.user.client;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.DialogBox;
/** A DialogBox that automatically re-centers itself if the window changes */
public class AutoCenterDialogBox extends DialogBox {
private HandlerRegistration recenter;
public AutoCenterDialogBox() {
this(false);
}
public AutoCenterDialogBox(boolean autoHide) {
this(autoHide, true);
}
public AutoCenterDialogBox(boolean autoHide, boolean modal) {
super(autoHide, modal);
}
@Override
public void show() {
if (recenter == null) {
recenter =
Window.addResizeHandler(
new ResizeHandler() {
@Override
public void onResize(ResizeEvent event) {
final int w = event.getWidth();
final int h = event.getHeight();
AutoCenterDialogBox.this.onResize(w, h);
}
});
}
super.show();
}
@Override
protected void onUnload() {
if (recenter != null) {
recenter.removeHandler();
recenter = null;
}
super.onUnload();
}
/**
* Invoked when the outer browser window resizes.
*
* <p>Subclasses may override (but should ensure they still call super.onResize) to implement
* custom logic when a window resize occurs.
*
* @param width new browser window width
* @param height new browser window height
*/
protected void onResize(int width, int height) {
if (isAttached()) {
center();
}
}
}
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