/*******************************************************************************

 * Copyright (c) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - initial implementation

 *******************************************************************************/

package org.eclipse.swt.internal.qt;

import org.eclipse.ercp.swt.mobile.Command;

import org.eclipse.swt.internal.qt.CommandArranger.CommandCollection;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Internal_PackageSupport;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.swt.widgets.Widget;

public class DesktopCommandPresentationStrategy extends

        CommandPresentationStrategy {

    private int commandsMenu;

    private int commandsMenuAction;

    private Control previousFocus;

    public DesktopCommandPresentationStrategy(){

        super();

        initCommandsMenu();

    }

    protected void handleCommandListChange(Command added, Command removed,

            CommandCollection commands) {

        Shell shell = null;

        if ( added != null ){

            shell = added.control.getShell();

            OS.QMenu_addAction(commandsMenu, handle(added) );

        }

        else{

            shell = removed.control.getShell();

            OS.QWidget_removeAction(commandsMenu, handle(removed) );

        }

        OS.QMenuBar_addAction(shell.internal_getOwnMenuBar(), commandsMenuAction );

    }

    protected void handleFocusChange(Control focused,

            CommandCollection oldCommands, CommandCollection commands) {

        Shell shell = focused.getShell();

        if( oldCommands != null && oldCommands.getSize() >0 ){

            Command[] remove = oldCommands.getCommands(null);

            for(int i=0; i< remove.length; i++){

                if (previousFocus!= null && remove[i].control == previousFocus){

                    OS.QWidget_removeAction(handle(previousFocus), handle(remove[i]));

                }else{

                    OS.QWidget_removeAction(commandsMenu, handle(remove[i]));

                }

            }

        }

        if ( commands != null && commands.getSize() > 0 ){

            OS.QMenuBar_addAction(shell.internal_getOwnMenuBar(), commandsMenuAction );

            Command[] add = commands.getCommands(null);

            CommandUtils.sort(add);

            for(int i=0 ; i < add.length; i++){

                if ( add[i].control != focused ){

                    OS.QMenu_addAction( commandsMenu, handle(add[i]) );

                }

                else{

                    OS.QWidget_addAction(handle(focused), handle(add[i]));

                }

                if (add[i].isDefaultCommand() )OS.QMenu_setDefaultAction( commandsMenu, handle(add[i]) );

            }

        }

        //Store for use next time.

        previousFocus=focused;

    }

    protected void handleMenuBarChanged(int newMenuBar,

            CommandCollection commands) {

        OS.QMenuBar_addAction(newMenuBar, commandsMenuAction );

    }

    protected void dispose() {

        if (commandsMenu != 0 ){

            QObjectDeleteWrapper.deleteSafely( commandsMenu );

            commandsMenu = 0;

        }

        if (commandsMenuAction != 0 ){

            QObjectDeleteWrapper.deleteSafely( commandsMenuAction );

            commandsMenuAction = 0;

        }

    }

    private void initCommandsMenu (){

        commandsMenuAction = OS.QAction_new( 0 );

        OS.QAction_setText( commandsMenuAction, "Commands");

        commandsMenu = OS.QMenu_new( 0 );

        OS.QAction_setMenu( commandsMenuAction, commandsMenu );

    }

    protected void handleDefaultCommandChange(Command defaultCommand) {

        int handle = 0;

        if (defaultCommand != null ) handle = handle(defaultCommand);

        OS.QMenu_setDefaultAction( commandsMenu, handle );

    }

    private final int handle(Widget w) {

        return Internal_PackageSupport.handle(w);

    }

}