/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, 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
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.midp.main;
/**
* Automation API display controller
*/
public class AutoDisplayController extends DisplayController {
/** Foreground state changes listener */
AutoDisplayControllerListener listener;
/**
* Construct a DisplayController with a reference to the ProxyList.
*
* @param midletProxyList reference to the MIDlet proxy list
*/
public AutoDisplayController(MIDletProxyList midletProxyList) {
super(midletProxyList);
listener = null;
}
/**
* Call to notify that foreground MIDlet is changing and give the
* display controller a chance to preempt the change.
* Also the last MIDlet created state will be reset.
* <p>
* If the MIDlet to get the foreground is paused, then activate it.
*
* @param midlet proxy of the MIDlet to be put in the foreground
*
* @return Proxy of the next foreground MIDlet, may be the foreground
* MIDlet if the foreground should not change
*/
MIDletProxy foregroundMidletChanging(MIDletProxy midlet) {
MIDletProxy oldForeground = midletProxyList.getForegroundMIDlet();
MIDletProxy newForeground = super.foregroundMidletChanging(midlet);
notifyListenersOfForegroundChange(oldForeground, newForeground);
return newForeground;
}
/**
* Sets a listener for foreground state changes.
*
* @param listener listener
*/
public void setListener(AutoDisplayControllerListener listener) {
this.listener = listener;
}
/**
* Notifies listener about foreground change.
*
* @param oldForeground MIDlet currently in foreground
* @param newForeground MIDlet getting foreground
*/
private void notifyListenersOfForegroundChange(MIDletProxy oldForeground,
MIDletProxy newForeground) {
if (listener != null) {
listener.foregroundMIDletChanged(oldForeground, newForeground);
}
}
}
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