de.lilawelt.zmachine.client.ContextMenu.java Source code

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Here is the source code for de.lilawelt.zmachine.client.ContextMenu.java

Source

/***
 *  Copyright (C) 2011 Bernhard Amann
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License version 3 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ***/

package de.lilawelt.zmachine.client;

import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Event.NativePreviewEvent;
import com.google.gwt.user.client.Event.NativePreviewHandler;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.client.ui.MenuItem;
import com.google.gwt.user.client.ui.PopupPanel;

public class ContextMenu implements NativePreviewHandler, CloseHandler<PopupPanel> {
    private final PopupPanel p = new PopupPanel(true);
    private boolean active = false;
    private boolean initialized = false;

    public void onPreviewNativeEvent(NativePreviewEvent preview) {
        NativeEvent event = preview.getNativeEvent();
        if (event.getButton() != NativeEvent.BUTTON_RIGHT) {
            return;
        }

        if (active)
            return;
        if (!initialized) {
            createPopupMenu();
            initialized = true;
            p.addCloseHandler(this);
        }

        int x = event.getClientX();
        int y = event.getClientY();
        p.setPopupPosition(x, y);
        p.show();
        active = true;

        event.preventDefault();
        preview.cancel();
    }

    private void createPopupMenu() {

        Command close = new Command() {
            public void execute() {
                p.hide();
            }
        };

        Command contact = new Command() {
            public void execute() {
                PopupPanel contact = new PopupPanel(true);
                p.hide();
                HTML text = new HTML(
                        "Contact:<br><br>Bernhard Amann<br>Seehang 2a<br>82335 Berg<br><br>amannb@arcor.de<br><a href='http://z-machine.lilawelt.de' target='_blank'>Z-Machine.lilawelt.de</a>");
                contact.add(text);
                contact.center();
                contact.show();
            }
        };

        Command version = new Command() {
            public void execute() {
                PopupPanel version = new PopupPanel(true);
                p.hide();
                HTML text = new HTML("Version 0.3, all rights reserved<br><br>"
                        + "This interpreter is based on ZAX by<br>Matt Kimmel which was released under the<br>MIT LICENSE. See license terms <a href='http://z-machine.lilawelt.de/stuff/zax-LICENSE.txt' target='_blank'>here</a>.");
                version.add(text);
                version.center();
                version.show();
            }
        };

        MenuBar popupMenuBar = new MenuBar(true);
        MenuItem versionItem = new MenuItem("About", true, version);
        MenuItem contactItem = new MenuItem("Contact", true, contact);
        MenuItem closeItem = new MenuItem("Close", true, close);

        popupMenuBar.addItem(versionItem);
        popupMenuBar.addItem(contactItem);
        popupMenuBar.addItem(closeItem);

        popupMenuBar.setVisible(true);
        p.add(popupMenuBar);

    }

    public void onClose(CloseEvent<PopupPanel> event) {
        active = false;
    }

}