/*
*
*
* 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.lcdui;
import com.sun.midp.events.EventTypes;
import com.sun.midp.events.EventQueue;
import com.sun.midp.events.NativeEvent;
/**
* This class provides methods to send events of types
* handled by ForegroundEventConsumer I/F implementors.
* This class completely hide event construction & sending in its methods.
*
* Generic comments for all XXXEventProducers:
*
* For each supported event type there is a separate sendXXXEvent() method,
* that gets all needed parameters to construct an event of an approprate
* class.
* The method also performs event sending itself.
*
* If a given event type merges a set of logically different subtypes,
* this class shall provide separate methods for these subtypes.
*
* It is assumed that only one object instance of this class
* is initialized with the system event that is created at (isolate) startup.
*
* This class only operates on the event queue given to it during
* construction, the class does not obtain any restricted object itself,
* so it does not need protection.
*
* All MIDP stack subsystems that need to send events of supported types,
* must get a reference to an already created istance of this class.
* Typically, this instance should be passed as a constructor parameter.
*
* Class is NOT final to allow debug/profile/test/automation subsystems
* to change, substitute, complement default "event sending" functionality :
* Ex.
* class LogXXXEventProducer
* extends XXXEventProducer {
* ...
* void sendXXXEvent(parameters) {
* LOG("Event of type XXX is about to be sent ...")
* super.sendXXXEvent(parameters);
* LOG("Event of type XXX has been sent successfully !")
* }
* ...
* }
*/
public class ForegroundEventProducer {
/** Cached reference to the MIDP event queue. */
private EventQueue eventQueue;
/**
* Construct a new ForegroundEventProducer.
*
* @param theEventQueue An event queue where new events will be posted.
*/
public ForegroundEventProducer(EventQueue theEventQueue) {
eventQueue = theEventQueue;
}
/**
* Called to process a change a display's foreground/background status.
*
* @param midletIsolateId ID of the target isolate (where to send event)
* @param midletDisplayId ID of the target display
*/
public void sendDisplayForegroundNotifyEvent(
int midletIsolateId,
int midletDisplayId) {
NativeEvent event =
new NativeEvent(EventTypes.FOREGROUND_NOTIFY_EVENT);
event.intParam4 = midletDisplayId;
eventQueue.sendNativeEventToIsolate(event, midletIsolateId);
}
/**
* Called to process a change a display's foreground/background status.
*
* @param midletIsolateId ID of the target isolate (where to send event)
* @param midletDisplayId ID of the target display
*/
public void sendDisplayBackgroundNotifyEvent(
int midletIsolateId,
int midletDisplayId) {
NativeEvent event =
new NativeEvent(EventTypes.BACKGROUND_NOTIFY_EVENT);
event.intParam4 = midletDisplayId;
eventQueue.sendNativeEventToIsolate(event, midletIsolateId);
}
}
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