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

 * Copyright (c) 2009 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

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

#ifndef _EXECEXCEPTIONHANDLER_H_

#define _EXECEXCEPTIONHANDLER_H_

#include <QDialog>

#include <QMenu>

namespace Java { namespace eSWT {

/**

 * Abstract base class for event loop termination handling. Subclass instances

 * of these can  be used when exec() has been called and needs to be forced to

 * terminate. This is needed e.g. in the case of Java exceptions during exec().

 */

class ExecExceptionHandler

{

protected:

    ExecExceptionHandler(QObject* aObject) : mExecutor( aObject ), mTerminated( false ) {}

public:

    virtual ~ExecExceptionHandler() {}

    /**

     * Returns the object that exec() has been called on. E.g. a QMenu or

     * a QDialog.

     * @return QObject pointer

     */

    QObject* executor() { return mExecutor; }

    /**

     * Terminates the exec event loop.

     */

    void terminate() { doTerminate(); mTerminated = true; }

    /**

     * Query if terminate() has already been called.

     * @return true if already terminated.

     */

    bool isTerminated() { return mTerminated; }

private:

    ExecExceptionHandler() {}

protected:

    virtual void doTerminate() = 0;

    QObject* mExecutor;

    bool mTerminated;

};

/**

 * Handles how to terminate QDialog::exec().

 */

class DialogExecExceptionHandler : public ExecExceptionHandler

{

public:

    DialogExecExceptionHandler(QDialog* aObject) : ExecExceptionHandler( aObject ) {}

    void doTerminate()

    {

        QDialog* dlg = qobject_cast<QDialog*>(mExecutor);

        if(dlg) dlg->reject();

    }

};

/**

 * Handles how to terminate QMenu::exec().

 */

class MenuExecExceptionHandler : public ExecExceptionHandler

{

public:

    MenuExecExceptionHandler(QMenu* aObject) : ExecExceptionHandler( aObject ) {}

    void doTerminate()

    {

        QMenu* menu = qobject_cast<QMenu*>(mExecutor);

        if(menu) menu->close();

    }

};

}}

#endif //_EXECEXCEPTIONHANDLER_H_