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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.
*
* References:
* Based on the SWT snippet example at
* http://dev.eclipse.org/viewcvs/viewvc.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet354.java?view=co
*/
package com.android.menubar;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import java.lang.reflect.Method;
public class MenuBarEnhancer37 implements IMenuBarEnhancer {
private static final int kAboutMenuItem = -1; // SWT.ID_ABOUT in SWT 3.7
private static final int kPreferencesMenuItem = -2; // SWT.ID_PREFERENCES in SWT 3.7
private static final int kQuitMenuItem = -6; // SWT.ID_QUIT in SWT 3.7
public MenuBarEnhancer37() {
}
public MenuBarMode getMenuBarMode() {
return MenuBarMode.MAC_OS;
}
/**
* Setup the About and Preferences native menut items with the
* given application name and links them to the callback.
*
* @param appName The application name.
* @param display The SWT display. Must not be null.
* @param callbacks The callbacks invoked by the menus.
*/
public void setupMenu(
String appName,
Display display,
IMenuBarCallback callbacks) {
try {
// Initialize the menuItems.
initialize(display, appName, callbacks);
} catch (Exception e) {
throw new IllegalStateException(e);
}
// Schedule disposal of callback object
display.disposeExec(new Runnable() {
public void run() {
}
});
}
/**
* Checks whether the required SWT 3.7 APIs are available.
* <br/>
* Calling this will load the class, which is OK since this class doesn't
* directly use any SWT 3.7 API -- instead it uses reflection so that the
* code can be loaded under SWT 3.6.
*
* @param display The current SWT display.
* @return True if the SWT 3.7 API are available and this enhancer can be used.
*/
public static boolean isSupported(Display display) {
try {
Object sysMenu = call0(display, "getSystemMenu");
if (sysMenu instanceof Menu) {
return findMenuById((Menu)sysMenu, kPreferencesMenuItem) != null &&
findMenuById((Menu)sysMenu, kAboutMenuItem) != null;
}
} catch (Exception ignore) {}
return false;
}
private void initialize(
Display display,
String appName,
final IMenuBarCallback callbacks)
throws Exception {
Object sysMenu = call0(display, "getSystemMenu");
if (sysMenu instanceof Menu) {
MenuItem menu = findMenuById((Menu)sysMenu, kPreferencesMenuItem);
if (menu != null) {
menu.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent event) {
callbacks.onPreferencesMenuSelected();
}
});
}
menu = findMenuById((Menu)sysMenu, kAboutMenuItem);
if (menu != null) {
menu.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent event) {
callbacks.onAboutMenuSelected();
}
});
menu.setText("About " + appName);
}
menu = findMenuById((Menu)sysMenu, kQuitMenuItem);
if (menu != null) {
// We already support the "quit" operation, no need for an extra handler here.
menu.setText("Quit " + appName);
}
}
}
private static Object call0(Object obj, String method) {
try {
Method m = obj.getClass().getMethod(method, (Class<?>[])null);
if (m != null) {
return m.invoke(obj, (Object[])null);
}
} catch (Exception ignore) {}
return null;
}
private static MenuItem findMenuById(Menu menu, int id) {
MenuItem[] items = menu.getItems();
for (int i = items.length - 1; i >= 0; i--) {
MenuItem item = items[i];
Object menuId = call0(item, "getID");
if (menuId instanceof Integer) {
if (((Integer) menuId).intValue() == id) {
return item;
}
}
}
return null;
}
}
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