blob: c2272c59350bc324c6b7f6346eb780585c5f0fea [file] [log] [blame]
// Copyright (C) 2009 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.globalkey.client;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.SimpleEventBus;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;
public class ShowHelpCommand extends KeyCommand {
public static final ShowHelpCommand INSTANCE = new ShowHelpCommand();
private static final EventBus BUS = new SimpleEventBus();
private static KeyHelpPopup current;
public static HandlerRegistration addFocusHandler(FocusHandler fh) {
return BUS.addHandler(FocusEvent.getType(), fh);
}
public ShowHelpCommand() {
super(0, '?', KeyConstants.I.showHelp());
}
@Override
public void onKeyPress(final KeyPressEvent event) {
if (current != null) {
// Already open? Close the dialog.
//
current.hide();
return;
}
final KeyHelpPopup help = new KeyHelpPopup();
help.addCloseHandler(
new CloseHandler<PopupPanel>() {
@Override
public void onClose(final CloseEvent<PopupPanel> event) {
current = null;
BUS.fireEvent(new FocusEvent() {});
}
});
current = help;
help.setPopupPositionAndShow(
new PositionCallback() {
@Override
public void setPosition(final int pWidth, final int pHeight) {
final int left = (Window.getClientWidth() - pWidth) >> 1;
final int wLeft = Window.getScrollLeft();
final int wTop = Window.getScrollTop();
help.setPopupPosition(wLeft + left, wTop + 50);
}
});
}
}