/*

* 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 <qset.h>

#include <qitemselectionmodel.h>

#include <mpxitemid.h>

class QGraphicItem;

class QItemSelection;

class HbWidget;

class HbLabel;

class HbCheckBox;

class HbStackedWidget;

class VideoCollectionUiLoader;

class VideoCollectionWrapper;

class VideoSortFilterProxyModel;

class VideoListWidget;

class VideoListSelectionDialog: public HbDialog

{     

    /**

     * definition required for emitting / connecting signals 

     */

    Q_OBJECT

    /**

     * disable copy-constructor and assignment operator

     */

    Q_DISABLE_COPY(VideoListSelectionDialog) 

public: 

    enum TSelectionFunction

    {

        EDeleteVideos,

        ESelectCollection

    };

    /**

     * 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 type selection dialog function typy

     * @param activeItem id of item that the selection concerns

     */

    void setupContent(int type, TMPXItemId activeItem = TMPXItemId::InvalidId());

public slots:

    /**

     * Shows modal dialog build from the provided Videolistwidget.

     *

     */

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); 

    /**

     * connected to list's activated -signal. Called when singel item is selected.

     * If dialog's selection type is ESelectCollection, saves mpx id from provided index.

     * and closes dialog by triggering primary action

     *

     * @param index of item selected

     */

    void singleItemSelectedSlot(const QModelIndex &index); 

    /**

     * handles model ready signal from model.

     * In case dialog type is ESelectCollection and there are no data

     * in model, opens up a selection dialog for user to input new album name

     * In case type is something else than ESelectCollection, calls

     * updateCounterSlot()

     */

    void modelReadySlot();

    /**

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

     *

     */

    void updateCounterSlot();

    /**

     * Primary action triggered signal slot.

     * 

     */

    void primaryActionTriggeredSlot();

private:

    /**

     * Method initializes dialog by getting all ui components and 

     * checking if they are valid

     * 

     * @return bool true if inisializaion ok

     */

    bool initDialog();

    /**

     * Method activated dialog based on value in mTypeOfSelection

     */

    void activateSelection();

    /**

     * connects all required signals into appropriate slots 

     * for selection mode

     */

    void connectSignals();

    /**

     * disconnects all signals 

     */

    void disconnectSignals();

    /**

     * Gets selected item's name from appropriate model.

     * 

     * @return QString item's name

     */

    QString getSelectedName();

    /**

     * opens an input dialog for a user to input new album name

     * 

     */

private:

    /**

     * docml UI loader, not owned

     */

    VideoCollectionUiLoader *mUiLoader;

    /**

     * type for defining selection functionality

     */

    int mTypeOfSelection;

    /**

     * Selection 

     */

    QItemSelection mSelection;

    /**

     * Selected video items

     */

    QSet<TMPXItemId> mSelectedVideos;

    /**

     * selected single items album id

     */

    TMPXItemId mSelectedAlbumId;

    /**

     * header label

     */

    HbLabel *mHeading;

    /**

     * container widget for itemcount and checkbox;

     */

    HbWidget *mCheckboxContainer;

    /**

     * 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;  

    /**

     * Video list model

     */

    VideoSortFilterProxyModel *mModel;

    /** 

     * List widget to show in selection

     * */

    VideoListWidget *mListWidget;

};

#endif  //VIDEOLISTSELECTIONDIALOG_H