73 lines
2.5 KiB
Java
73 lines
2.5 KiB
Java
// Copyright (C) 2009 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gwtexpui.globalkey.client;
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import com.google.gwt.event.dom.client.FocusEvent;
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import com.google.gwt.event.dom.client.FocusHandler;
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import com.google.gwt.event.dom.client.KeyPressEvent;
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import com.google.gwt.event.logical.shared.CloseEvent;
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import com.google.gwt.event.logical.shared.CloseHandler;
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import com.google.gwt.event.shared.EventBus;
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import com.google.gwt.event.shared.HandlerRegistration;
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import com.google.gwt.event.shared.SimpleEventBus;
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import com.google.gwt.user.client.Window;
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import com.google.gwt.user.client.ui.PopupPanel;
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import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;
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public class ShowHelpCommand extends KeyCommand {
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public static final ShowHelpCommand INSTANCE = new ShowHelpCommand();
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private static final EventBus BUS = new SimpleEventBus();
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private static KeyHelpPopup current;
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public static HandlerRegistration addFocusHandler(FocusHandler fh) {
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return BUS.addHandler(FocusEvent.getType(), fh);
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}
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public ShowHelpCommand() {
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super(0, '?', KeyConstants.I.showHelp());
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}
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@Override
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public void onKeyPress(KeyPressEvent event) {
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if (current != null) {
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// Already open? Close the dialog.
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//
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current.hide();
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return;
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}
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final KeyHelpPopup help = new KeyHelpPopup();
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help.addCloseHandler(
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new CloseHandler<PopupPanel>() {
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@Override
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public void onClose(CloseEvent<PopupPanel> event) {
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current = null;
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BUS.fireEvent(new FocusEvent() {});
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}
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});
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current = help;
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help.setPopupPositionAndShow(
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new PositionCallback() {
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@Override
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public void setPosition(int pWidth, int pHeight) {
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final int left = (Window.getClientWidth() - pWidth) >> 1;
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final int wLeft = Window.getScrollLeft();
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final int wTop = Window.getScrollTop();
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help.setPopupPosition(wLeft + left, wTop + 50);
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}
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});
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}
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}
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