/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:   Videolist selection dialog 

* 

*/

#ifndef VIDEOLISTSELECTIONDIALOG_H

#define VIDEOLISTSELECTIONDIALOG_H

#include <hbdialog.h>

#include <qlist.h>

#include <qitemselectionmodel.h>

class QGraphicItem;

class QItemSelection;

class HbLabel;

class HbCheckBox;

class HbStackedWidget;

class VideoListWidget;

class VideoCollectionUiLoader;

class VideoSortFilterProxyModel;

class VideoListSelectionDialog: public HbDialog

{     

    /**

     * definition required for emitting / connecting signals 

     */

    Q_OBJECT

    /**

     * disable copy-constructor and assignment operator

     */

    Q_DISABLE_COPY(VideoListSelectionDialog) 

public: 

    /**

     * Constructor

     *

     * @param uiLoader used to load UI components from docml

     * @param parent item's parent component

     */

    VideoListSelectionDialog(VideoCollectionUiLoader *uiLoader, QGraphicsItem *parent=0);

    /**

     * Destructor

     */

    ~VideoListSelectionDialog();

    /**

     * Method setups provided title and videolist content widget.

     * Prepares dialog for showing.

     * If either provided title is empty or widget is NULL, dialog

     * is in invalid state and cannot be shown using exec.

     *

     * @param title title of the dialog

     * @param videoList videolist widget.

     */

    void setContent(const QString &title, VideoListWidget *videoList);

    /**

     * Returns selection (mSelection). Selection will be empty in case

     * dialog is closed using cancell button,

     *

     * @return HbAction primary action if "OK" iis pressed

     */

    const QItemSelection& getSelection() const;

public slots:

    /**

     * Shows modal dialog build from the provided Videolistwidget.

     *

     * @return HbAction primary action if "OK" iis pressed

     */

    HbAction* exec();

private slots:

    /**

     * Slot connected to mCheckBox's stateChanged -signal. 

     * Selects or deselects all items if mForcedCheck -flag is false.

     * 

     * If Forcedcehck is true, it indeicates that we want to change the checked state

     * only, not slect or deselect anything. This is needed for example if after 

     * all items are marked, user manually deselects item's. In that case all is not

     * marked, so checked state needs to be changed. 

     *

     * @param state Qt::Checked everything should be set as selected.

     */

    void markAllStateChangedSlot(int state);

    /**

     * disables or enables popup's primary action in case selection changes

     *

     * @param selected item selection list containing selected

     * @param deselected item selection list containing  not selected (not used in this scope)

     */

    void selectionChangedSlot(const QItemSelection &selected, const QItemSelection &deselected); 

    /**

     * Changes the counter value. Sets the checkbutton state based on selection count.

     *

     */

    void updateCounterSlot();

private:

    /**

     * connects all required signals into appropriate slots 

     * for selection mode

     */

    void connectSignals();

    /**

     * disconnects all signals 

     */

    void disconnectSignals();

private:    

    /**

     * docml UI loader, not owned

     */

    VideoCollectionUiLoader *mUiLoader;

    /**

     * content videolist, not owned

     */

    VideoListWidget *mVideoList;

    /**

     * Selection 

     */

    QItemSelection mSelection;

    /**

     * header label

     */

    HbLabel *mHeading;

    /**

     * counter label from docml

     */

    HbLabel *mItemCount;

    /**

     * mark all checkbox

     */

    HbCheckBox *mCheckBox;

    /**

     * videolist container in dialog

     */

    HbStackedWidget *mListContainer;

    /**

     * flag indicating that we've changed check-btn state 

     * explicitly and don't wanna handle selection based on that 

     */

    bool mForcedCheck;

};

#endif  //VIDEOLISTSELECTIONDIALOG_H