/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.openjpa.trader.client.ui;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Frame;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
/**
* An anchor that pops up a min-browser with some hopefully helpful text.
*
* @author Pinaki Poddar
*
*/
public class HelpLink extends Anchor implements ClickHandler {
private final String url;
private static HelpWindow window;
public HelpLink(String url) {
super("Help", url, "Help");
this.url = url;
addClickHandler(this);
if (window == null) {
window = new HelpWindow();
}
addStyleName("help");
}
@Override
public void onClick(ClickEvent event) {
window.showHelp(url);
event.preventDefault();
}
public class HelpWindow extends PopupPanel implements PopupPanel.PositionCallback {
private final Frame frame;
public HelpWindow() {
super(true);
setAnimationEnabled(true);
setAutoHideEnabled(true);
setModal(false);
VerticalPanel panel = new VerticalPanel();
frame = new Frame();
frame.setPixelSize(400, 300);
Button close = new Button("close");
close.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
hide();
}
});
panel.add(frame);
panel.add(close);
setWidget(panel);
setVisible(true);
}
public void showHelp(String url) {
frame.setUrl(url);
super.setPopupPositionAndShow(this);
}
public void setPosition(int offsetWidth, int offsetHeight) {
int left = Window.getClientWidth() - getWidget().getOffsetWidth() - 100;
int top = 40;
setPopupPosition(left, top);
}
}
}