// 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.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.event.dom.client.HasKeyPressHandlers;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

class DocWidget extends Widget implements HasKeyPressHandlers {
  private static DocWidget me;

  static DocWidget get() {
    if (me == null) {
      me = new DocWidget();
    }
    return me;
  }

  private DocWidget() {
    setElement((Element) docnode());
    onAttach();
    RootPanel.detachOnWindowClose(this);
  }

  @Override
  public HandlerRegistration addKeyPressHandler(KeyPressHandler handler) {
    return addDomHandler(handler, KeyPressEvent.getType());
  }

  private static Node docnode() {
    return Document.get();
  }
}