package org.gudy.azureus2.ui.swt.components.shell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.gudy.azureus2.core3.logging.LogEvent;
import org.gudy.azureus2.core3.logging.LogIDs;
import org.gudy.azureus2.core3.logging.Logger;
import org.gudy.azureus2.ui.swt.Utils;
import java.util.*;
/*
* Created on 17-Mar-2005
* Created by James Yeh
* Copyright (C) 2004-2005 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* 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 for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
/**
* ShellManager provides a logical grouping for a set of shells
* <p><b>Note</b>: This class must be used from the SWT display thread</p>
* @version 1.0
* @author James Yeh
* @see org.eclipse.jface.window.WindowManager
*/
public class ShellManager
{
private static ShellManager instance;
private final Collection shells = new ArrayList();
private final List addHandlers = new LinkedList();
private final List removeHandlers = new LinkedList();
static
{
instance = new ShellManager();
}
/**
* <p>Gets the application's shared shell manager</p>
* <p>This ShellManager has no bearing on other ShellManager instances</p>
* <p><b>Note</b>: This method must be invoked by the SWT display thread</p>
* @return
*/
public static final ShellManager sharedManager()
{
return instance;
}
/**
* Adds a shell to the shell manager. If the shell is already managed, it is not added again.
* <p><b>Note</b>: This method must be invoked by the SWT display thread</p>
* @param shell A SWT Shell
*/
public final void addWindow(final Shell shell)
{
//Debug.out("Invoked by thread " + Thread.currentThread().getName());
if(shells.contains(shell)) {return;}
shells.add(shell);
notifyAddListeners(shell);
shell.addDisposeListener(new DisposeListener()
{
public void widgetDisposed(DisposeEvent event)
{
try {
removeWindow(shell);
} catch (Exception e) {
Logger.log(new LogEvent(LogIDs.GUI, "removeWindow", e));
}
}
});
shell.addListener(SWT.Show, new Listener() {
public void handleEvent(Event event) {
Utils.verifyShellRect(shell, false);
}
});
}
/**
* Removes a shell from the shell manager
* <p><b>Note</b>: This method must be invoked by the SWT display thread</p>
* @param shell A SWT Shell
*/
public final void removeWindow(Shell shell)
{
shells.remove(shell);
notifyRemoveListeners(shell);
}
/**
* <p>Gets the shells managed by the manager as an Iterator</p>
* <p>The order in which the shells were added are retained.</p>
* <p><b>Note</b>: This method must be invoked by the SWT display thread</p>
* @return The iterator
*/
public final Iterator getWindows()
{
return shells.iterator();
}
/**
* Gets whether the ShellManager manages no shells
* @return True if ShellManager is empty
*/
public final boolean isEmpty()
{
return shells.isEmpty();
}
/**
* Gets the number of shells the ShellManager manages
* @return The number
*/
public final int getSize()
{
return shells.size();
}
/**
* <p>Invokes the handleEvent method specified by the SWT listener for each managed shell</p>
* <p>The event's widget is set to the reference of the shell invoking it</p>
* @param command A command implemented as a SWT Listener
*/
public final void performForShells(final Listener command)
{
Iterator iter = shells.iterator();
for(int i = 0; i < shells.size(); i++)
{
Shell aShell = (Shell)iter.next();
Event evt = new Event();
evt.widget = aShell;
evt.data = this;
command.handleEvent(evt);
}
}
/**
* Gets the set of managed shells
* @return The set
*/
protected final Collection getManagedShellSet()
{
return shells;
}
// events
/**
* <p>Adds a listener that will be invoked when a shell has been added to the ShellManager</p>
* <p>The listener and the shell will automatically be removed when the shell is disposed</p>
* @param listener A SWT Listener
*/
public final void addWindowAddedListener(Listener listener)
{
addHandlers.add(listener);
}
/**
* Removes a listener that will be invoked when a shell has been added to the ShellManager
* @param listener A SWT Listener
*/
public final void removeWindowAddedListener(Listener listener)
{
addHandlers.remove(listener);
}
/**
* Adds a listener that will be invoked when a shell has been removed from the ShellManager
* @param listener A SWT Listener
*/
public final void addWindowRemovedListener(Listener listener)
{
removeHandlers.add(listener);
}
/**
* Removes a listener that will be invoked when a shell has been removed from the ShellManager
* @param listener A SWT Listener
*/
public final void removeWindowRemovedListener(Listener listener)
{
removeHandlers.remove(listener);
}
/**
* Notifies the WindowAddedListener handlers
* @param sender A SWT shell that "sends" the events
*/
protected final void notifyAddListeners(Shell sender)
{
Iterator iter = addHandlers.iterator();
for(int i = 0; i < addHandlers.size(); i++)
{
((Listener)iter.next()).handleEvent(getSWTEvent(sender));
}
}
/**
* Notifies the WindowRemovedListener handlers
* @param sender A SWT shell that "sends" the events
*/
protected final void notifyRemoveListeners(Shell sender)
{
Iterator iter = removeHandlers.iterator();
for(int i = 0; i < removeHandlers.size(); i++)
{
((Listener)iter.next()).handleEvent(getSWTEvent(sender));
}
}
/**
* <p>Gets a generated SWT Event based on the shell</p>
* <p>The widget field of the event should be set to the shell</p>
* @param shell A SWT Shell
* @return The event
*/
protected Event getSWTEvent(Shell shell)
{
Event e = new Event();
e.widget = shell;
e.item = shell;
return e;
}
}
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