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/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the BSD license.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*************************************************************************/
import com.sun.star.accessibility.XAccessible;
import com.sun.star.accessibility.XAccessibleEventListener;
import com.sun.star.accessibility.AccessibleEventObject;
import com.sun.star.lang.EventObject;
import com.sun.star.awt.XTopWindowListener;
import com.sun.star.uno.UnoRuntime;
import java.util.LinkedList;
/** This class acts as a proxy for the simple screen reader. It waits for
two types of events:
1. Accessibility events signal modifications concerning accessibility
objects.
2. Top window events inform the listener about new or removed windows.
This class exists because events had to be handled in a seperate thread
to avoid dead locks: The thread that receives an event must no call back
to the Office directly.
Soon this should not be necessary anymore. There is now a flag which
switches between synchronous and asynchronous callbacks.
All reveived events are eventually forwarded to the actual listener. In
this way it decouples the Office from the listener.
*/
class EventListenerProxy
implements Runnable, XAccessibleEventListener, XTopWindowListener
{
public EventListenerProxy (EventHandler aListener)
{
maListener = aListener;
mbAsynchron = true;
if (mbAsynchron)
{
maEventQueue = new LinkedList();
new Thread (this, "EventListenerProxy").start();
}
}
private void addEvent (Runnable aEventObject)
{
if (mbAsynchron)
synchronized (maEventQueue)
{
maEventQueue.addLast (aEventObject);
// Tell the queue that there is a new event in the queue.
maEventQueue.notify();
}
else
{
System.out.println ("running " + aEventObject);
aEventObject.run();
System.out.println (" done");
}
}
/** In an infinite loop, check for events to deliver, then wait on lock
(which will be notified when new events arrive)
*/
public void run ()
{
while (true)
{
// Process all events that are currently in the queue.
Runnable aEvent;
do
{
synchronized (maEventQueue)
{
if (maEventQueue.size() > 0)
aEvent = (Runnable)maEventQueue.removeFirst();
else
aEvent = null;
}
if (aEvent != null)
{
try
{
aEvent.run();
}
catch (Throwable aException)
{
MessageArea.println(
"Exception during event delivery: " + aException);
aException.printStackTrace();
}
}
}
while (aEvent != null);
// Now that the queue is empty go to sleep again.
try
{
synchronized (maEventQueue)
{
maEventQueue.wait();
}
}
catch (Exception aException)
{
// Ignore this exception since there is not much
// that we can do about it.
}
}
}
public void disposing( final EventObject aEvent)
{
addEvent (new Runnable()
{
public void run()
{
maListener.disposing (aEvent);
}
} );
}
public void notifyEvent (final AccessibleEventObject aEvent)
{
addEvent (
new Runnable()
{
public void run()
{
maListener.notifyEvent (aEvent);
}
} );
}
public void windowOpened (final com.sun.star.lang.EventObject aEvent)
{
addEvent (
new Runnable()
{
public void run()
{
maListener.windowOpened (
(XAccessible) UnoRuntime.queryInterface(
XAccessible.class,
aEvent.Source));
}
} );
}
public void windowClosing (final com.sun.star.lang.EventObject aEvent)
{
// Ignored.
}
public void windowClosed (final com.sun.star.lang.EventObject aEvent)
{
addEvent (
new Runnable()
{
public void run()
{
maListener.windowClosed (
(XAccessible) UnoRuntime.queryInterface(
XAccessible.class,
aEvent.Source));
}
} );
}
public void windowMinimized (com.sun.star.lang.EventObject aEvent)
{
// Ignored.
}
public void windowNormalized (com.sun.star.lang.EventObject aEvent)
{
// Ignored.
}
public void windowActivated (com.sun.star.lang.EventObject aEvent)
{
// Ignored.
}
public void windowDeactivated (com.sun.star.lang.EventObject aEvent)
{
// Ignored.
}
/** The queue of event objects, LinkedList<Runnable>.
The queue object will also serve as lock for the consumer/producer type
syncronization.
*/
private LinkedList maEventQueue;
/** This is the actual listener that the events will eventually forwarded to.
*/
private EventHandler maListener;
/** This flag determines whether event forwarding is done asynchroniously
or synchroniously.
*/
private boolean mbAsynchron;
}
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