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

**

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

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbWidgets module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

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

#include "hbcombobox_p.h"

#include <hblistview.h>

#include <hbabstractviewitem.h>

#include <hbdeviceprofile.h>

#include <hbtoucharea.h>

#include <hbmainwindow.h>

#include <hbview.h>

#include <hbtextitem.h>

#include <hbstyleoptioncombobox_p.h>

#include <hbgraphicsscene.h>

#include <QSortFilterProxyModel>

#include <QCompleter>

#include <QItemSelectionModel>

#include <QApplication>

#ifdef HB_EFFECTS

#include <hbeffect.h>

#include "hbeffectinternal_p.h"

#define HB_DROPD0WN_ITEM_TYPE "HB_DROPDOWN"

#endif

#include <hbtapgesture.h>

HbComboBoxPrivate::HbComboBoxPrivate( ):

    HbWidgetPrivate ( ),

    mLineEdit ( 0 ),

    mTextItem ( 0 ),

    mButton ( 0 ),

    mDropDown ( 0 ),

    mModel ( 0 ),

    mProxyModel ( 0 ),

    mCompleter ( 0 ),

    insertPolicy ( HbComboBox::InsertAtBottom ),

    mBackgroundItem ( 0 ),

    mButtonTouchAreaItem ( 0 ),

    mIsDown ( false ),

    mEditable ( false ),

    mIsDorpdownCreated( false ),

    mIsDropwnToSceneAdded( false ),

    mHasDownEffect ( false ),

    mHasUpEffect ( false ),

    mListItemHeight( -1 ),

    mDropDownRowsInPortrait( -1 ),

    mDropDownRowsInLandscape( -1 )

{

}

HbComboBoxPrivate::~HbComboBoxPrivate( )

{

    Q_Q( HbComboBox );

    if( mButtonTouchAreaItem ) {

        static_cast<HbTouchArea*>( mButtonTouchAreaItem )->removeEventFilter( q );

    }

    if ( !mDropDown ) {

        return;

    }

    //if drop down is added to scene then remove it from scene so that scene does not deletes

    //drop down again

    if( mDropDown->scene() ) {

        q->scene()->removeItem(mDropDown);

    }

    delete mDropDown;

    mDropDown = 0;

}

void HbComboBoxPrivate::init( )

{

    createPrimitives( );

}

void HbComboBoxPrivate::createPrimitives( )

{

    Q_Q( HbComboBox );

    mTextItem = HbStylePrivate::createPrimitive( HbStylePrivate::P_ComboBox_text, q );

    HbStyle::setItemName( mTextItem, "combobox_labelfield" );

    mBackgroundItem = HbStylePrivate::createPrimitive( HbStylePrivate::P_ComboBox_background, q );

    HbStyle::setItemName( mBackgroundItem, "text_background" );

    mButton = HbStylePrivate::createPrimitive( HbStylePrivate::P_ComboBox_button, q );

    HbStyle::setItemName( mButton, "combobox_button" );

    mButtonTouchAreaItem = HbStylePrivate::createPrimitive( HbStylePrivate::P_ComboBoxButton_toucharea, q );

    static_cast<HbTouchArea*>( mButtonTouchAreaItem )->grabGesture( Qt::TapGesture );

}

void HbComboBoxPrivate::touchAreaPressEvent( )

{    

    Q_Q( HbComboBox );

    if ( q->count( ) > 0 ) {

        HbWidgetFeedback::triggered( q, Hb::InstantPressed );

    }

    mIsDown = true;

    q->updatePrimitives( );

    //Update the state only when valid model is there

    if ( mModel && mModel->rowCount( ) ) {

        q->setProperty( "state", "pressed" );

    }

}

void HbComboBoxPrivate::touchAreaReleaseEvent(  )

{

    Q_Q( HbComboBox );

    mIsDown = false;

    touchAreaClicked( );

    q->updatePrimitives( );

    if ( q->count( ) > 0 ) {

        HbWidgetFeedback::triggered( q, Hb::InstantReleased );

    }

}

void HbComboBoxPrivate::touchAreaClicked( )

{

    Q_Q( HbComboBox );

    if ( mModel && mModel->rowCount( ) ) {

        addDropDownToScene( );

        mDropDown->setVisible( true );

        q->setProperty( "state", "latched" );

        if( !mDropDown->mList ) {

            mDropDown->createList( );

            mDropDown->mList->setModel( mModel );

            q->connect( mDropDown->mList, SIGNAL( activated( QModelIndex ) ), q,

                SLOT( _q_textChanged( QModelIndex ) ) );

            //send layout request so that geometries of list view item are updated

            //and proper height is fetched in calculateListItemHeight

            QEvent layoutEvent(QEvent::LayoutRequest);

            QApplication::sendEvent(mDropDown->mList->contentWidget(), &layoutEvent);

        }

        if ( mCurrentIndex.isValid( ) ) {

            if( mDropDown->mList->model( ) != mModel ) {

                mDropDown->mList->setModel( mModel );

            }

            mDropDown->mList->scrollTo( mCurrentIndex, HbAbstractItemView::PositionAtTop );

            mDropDown->mList->setCurrentIndex( mCurrentIndex, QItemSelectionModel::Select );

        } else {

            if( mDropDown->mList->model( ) != mModel ) {

                mDropDown->mList->setModel( mModel );

            }

            mDropDown->mList->scrollTo( mModel->index( 0, 0 ) );

            mDropDown->mList->setCurrentIndex( 

                mModel->index( 0, 0 ), QItemSelectionModel::Select );

        }

        #ifdef HB_EFFECTS

        HbEffect::start( mDropDown, HB_DROPD0WN_ITEM_TYPE, "appear" );

        #endif

    }

}

void HbComboBoxPrivate::vkbOpened( )

{

}

void HbComboBoxPrivate::vkbClosed( )

{

    if( mDropDown->isVisible( ) ) {

        positionDropDown( );

    }

}

void HbComboBoxPrivate::showPopup( QAbstractItemModel *aModel, QModelIndex aIndex )

{

    Q_Q( HbComboBox );

    if ( aModel && aModel->rowCount( ) ) {

        addDropDownToScene( );

        if( !mDropDown->mList ) {

            mDropDown->createList( );

            q->connect( mDropDown->mList, SIGNAL( activated( QModelIndex ) ), q,

                SLOT( _q_textChanged( QModelIndex ) ) );

        }

        mDropDown->mList->setModel( aModel );

        if ( aIndex.isValid( ) ) {

            mDropDown->mList->scrollTo( aIndex, HbAbstractItemView::PositionAtTop );

            mDropDown->mList->setCurrentIndex( mCurrentIndex, QItemSelectionModel::Select );

        } else {

            mDropDown->mList->scrollTo( aModel->index( 0, 0 ) );

        }

        positionDropDown( );

    }

}

void HbComboBoxPrivate::createDropDown( )

{

    Q_Q ( HbComboBox );

    if( !mIsDorpdownCreated ) {

        mDropDown = new HbComboDropDown( this );

        mIsDorpdownCreated = true;

        mDropDown->setVisible( false );

        q->setProperty( "state", "normal" );

    }

}

void HbComboBoxPrivate::calculateListItemHeight( )

{

    QAbstractItemModel *model = mDropDown->mList->model( );

    if( mCurrentIndex.isValid( ) && mDropDown->mList->itemByIndex( mCurrentIndex ) ) {

        mListItemHeight = mDropDown->mList->itemByIndex( mCurrentIndex )->geometry( ).height( );

    } else if( model->index( 0, 0 ).isValid( ) && 

        mDropDown->mList->itemByIndex( model->index( 0, 0 ) ) ) {

        mListItemHeight = 

            mDropDown->mList->itemByIndex( model->index( 0, 0 ) )->geometry( ).height( );

    } else {

        HbListViewItem *proto = mDropDown->mList->listItemPrototype( );

        HbListViewItem *temp = static_cast<HbListViewItem*>( proto->createItem( ) );

        mListItemHeight = temp->effectiveSizeHint( Qt::PreferredSize ).height( );

        delete temp;

        temp = 0;

    }

}

void HbComboBoxPrivate::resetGeometryChangeFlag( )

{

    Q_Q( HbComboBox );

    QGraphicsWidget *p = q;

    if( widgetGeometryChange.count() > 0 ) {

        while ( p->parentWidget( ) ) {

            p = p->parentWidget( );

            if ( !widgetGeometryChange.value( p ) ) {

                //if earlier geometry change flag was disabled then disable this flag

                p->setFlag( QGraphicsItem::ItemSendsGeometryChanges, false );

            }

        }

        widgetGeometryChange.clear();

    }

}

void HbComboBoxPrivate::positionDropDown( )

{

    Q_Q( HbComboBox );

    QRectF popupRect;

    QRectF sceneRect( QPointF( ), HbDeviceProfile::profile( q ).logicalSize( ) );

    QPointF widgetPos = q->scenePos( );

    QAbstractItemModel *model = mDropDown->mList->model( );

    calculateListItemHeight( );

    qreal totalHeightRequd = model->rowCount( ) * mListItemHeight;

    qreal maxPopupHeight = 0.0;

    //calculate the maximum popup height for different orientation

    if( q->mainWindow( )->orientation( ) == Qt::Horizontal ) {

        maxPopupHeight = mDropDownRowsInLandscape * mListItemHeight;

    } else if( q->mainWindow( )->orientation( ) == Qt::Vertical ) {

        maxPopupHeight = mDropDownRowsInPortrait * mListItemHeight;

    }

    if ( totalHeightRequd < maxPopupHeight ) {

        maxPopupHeight = totalHeightRequd;

    }

    QSizeF popupSize = QSizeF( q->rect( ).width( ), maxPopupHeight );

    QPointF popupPos;

    if( !mDropDown->vkbOpened ) {

        //position of drop down in both editable and non-editable combobox depends upon

        //the available space above and below combobox

        if( ( widgetPos.y( ) + q->rect( ).height( ) + maxPopupHeight) < sceneRect.height( ) ) {

            popupPos = QPointF( widgetPos.x( ), widgetPos.y( ) + q->rect( ).height( ) );

            #ifdef HB_EFFECTS

            if ( !mHasDownEffect ) {

                 mHasDownEffect = true;

                 mHasUpEffect = false;

                 //this Effect will be shown when there is space in the view bottom.

                 HbEffectInternal::add( mDropDown, "combo_appear_down", "appear" );

            }

            #endif

        } else if( widgetPos.y( ) - maxPopupHeight  > 0.0 ) {

            popupPos = QPointF( widgetPos.x( ), widgetPos.y( ) - maxPopupHeight );

            #ifdef HB_EFFECTS

            if ( !mHasUpEffect ) {

                 //this Effect will be shown when there is no space in the view bottom

                 mHasUpEffect = true;

                 mHasDownEffect = false;

                 HbEffectInternal::add( mDropDown, "combo_appear_up", "appear" );

                 HbEffectInternal::add( mDropDown, "combo_disappear_up", "disappear" );

            }

            #endif

        } else {

            qreal topScreenHeight = sceneRect.height( ) - maxPopupHeight;

            if( topScreenHeight > sceneRect.height( ) - topScreenHeight ) {

                popupPos = QPointF( widgetPos.x( ), 0.0 );

                #ifdef HB_EFFECTS

                if ( !mHasDownEffect ) {

                    mHasDownEffect = true;

                    mHasUpEffect = false;

                    //this Effect will be shown when there is more space in the view bottom.

                    HbEffectInternal::add( mDropDown, "combo_appear_down", "appear" );

                    HbEffectInternal::add( mDropDown, "combo_disappear_down", "disappear" );

                }

                #endif

            } else {

                popupPos = QPointF( widgetPos.x( ), sceneRect.height( ) - maxPopupHeight );

                #ifdef HB_EFFECTS

                if ( !mHasUpEffect ) {

                     mHasUpEffect = true;

                     mHasDownEffect = false;

                     //this Effect will be shown when there is more space in the view bottom.

                     HbEffectInternal::add( mDropDown, "combo_appear_up", "appear" );

                     HbEffectInternal::add( mDropDown, "combo_disappear_up", "disappear" );

                }

                #endif

            }

        }

    } else {

        // positioning drop down when vkb is positioned

        // drop down will come on top/below of combo based upon which side has more space

        // available 

        HbEditorInterface editorInterface( q );

        HbVkbHost *host = editorInterface.vkbHost( );

        if ( host ) {

            QSizeF keyBoardArea = host->keyboardArea( );

            QSize screenSize = HbDeviceProfile::profile( q ).logicalSize( );

            qreal heightDifference = screenSize.height( ) - keyBoardArea.height( );

            qreal topSpace = widgetPos.y( );

            qreal bottomSpace = heightDifference - topSpace - q->boundingRect( ).height( );

            if( topSpace > bottomSpace ) {

                //display drop down at top

                if( widgetPos.y( ) - maxPopupHeight  > 0.0 ) {

                    popupPos = QPointF( widgetPos.x( ), widgetPos.y( ) - maxPopupHeight );

                } else {

                    popupPos = QPointF( widgetPos.x( ), 0.0 );

                    popupSize.setHeight( topSpace );

                }

                #ifdef HB_EFFECTS

                if ( !mHasUpEffect ) {

                     mHasUpEffect = true;

                     mHasDownEffect = false;

                     //this Effect will be shown when there is more space in the view bottom.

                     HbEffectInternal::add( mDropDown, "combo_appear_up", "appear" );

                     HbEffectInternal::add( mDropDown, "combo_disappear_up", "disappear" );

                }

                #endif

            } else {

                //display drop down at bottom

                popupPos = QPointF( widgetPos.x( ), widgetPos.y( ) + q->rect( ).height( ) );

                if( bottomSpace < maxPopupHeight ) {

                    popupSize.setHeight( bottomSpace );

                }

                #ifdef HB_EFFECTS

                if ( !mHasDownEffect ) {

                    mHasDownEffect = true;

                    mHasUpEffect = false;

                    //this Effect will be shown when there is more space in the view bottom.

                    HbEffectInternal::add( mDropDown, "combo_appear_down", "appear" );

                    HbEffectInternal::add( mDropDown, "combo_disappear_down", "disappear" );

                }

                #endif

            }

        }

    }

    mDropDown->setPreferredSize( popupSize );

    mDropDown->setMinimumSize( popupSize );

    mDropDown->setMaximumSize( popupSize );

    mDropDown->setPos( popupPos );

    QGraphicsWidget *p = q;

    while ( p->parentWidget( ) ) {

        p = p->parentWidget( );

        //cache the original geometry change flag of parent widget

        QGraphicsItem::GraphicsItemFlags itemFlags = p->flags( );

        bool geometryFlagEnabled =  itemFlags & QGraphicsItem::ItemSendsGeometryChanges;

        widgetGeometryChange.insert(p, geometryFlagEnabled);

        //This flag is being set since geometry change notification is required for properly

        //positioning drop down when its visible and combobox position is changed for example

        //when orientation change happens.

        p->setFlag( QGraphicsItem::ItemSendsGeometryChanges );

    }

    mDropDown->setZValue( p->zValue( ) + 1 );

}

void HbComboBoxPrivate::_q_textChanged( const QModelIndex & aIndex )

{

    Q_Q( HbComboBox );

    QVariant data = mDropDown->mList->model( )->data( aIndex );

    mText = data.toString( );

    if( !mEditable ) {

        if( mLineEdit ) {

            mLineEdit->setText( mText );

        } else {

            HbStyleOptionComboBox comboBoxOption;

            q->initStyleOption( &comboBoxOption );

            HbStylePrivate::updatePrimitive( mTextItem, HbStylePrivate::P_ComboBox_text, &comboBoxOption );

        }

        mCurrentIndex = aIndex;

    } else {

       q->disconnect( mLineEdit, SIGNAL( textChanged ( QString ) ), q,

           SLOT( _q_textChanged( QString ) ) );

       mLineEdit->setText( mText );

       mCurrentIndex = findData( mText );

       q->connect( mLineEdit, SIGNAL( textChanged ( QString ) ), q, 

           SLOT( _q_textChanged( QString ) ) );

    }

    if ( mDropDown->isVisible( ) ) {

        q->setProperty( "state", "normal" );

    }

    currentIndexChanged( mCurrentIndex );

}

void HbComboBoxPrivate::_q_textCompleted( const QModelIndex & aIndex )

{

    if( aIndex.isValid( ) ) {

        showPopup( mCompleter->completionModel( ) );

    }

}

void HbComboBoxPrivate::_q_textChanged( const QString & aString )

{

    Q_Q( HbComboBox );

    if( !aString.isEmpty( ) ) {

        if ( mCompleter ) {

            mCompleter->setCompletionPrefix( aString );

            mCompleter->complete( );

            if( mCompleter->currentRow( ) == -1 ) {

                if ( ( mDropDown ) && ( mDropDown->isVisible( ) ) ) {

                    mDropDown->setVisible( false );

                }

            }

        }

    } else {

        if( mDropDown ) {

        }

        //showPopup( mModel, mCurrentIndex);

    }

    emit q->editTextChanged( aString );

}

void HbComboBoxPrivate::setModel( QAbstractItemModel * model )

{

    Q_Q ( HbComboBox );

    createDropDown( );    

    if ( mDropDown->isVisible( ) ) {

        mDropDown->setVisible( false );

        q->setProperty( "state", "normal" );

    }

    q->clear( );

    delete mModel;

    mModel = model;

    mModel->setParent( q );

    setCompletion( mEditable );

    if( mModel->rowCount( ) ) {

        q->setCurrentIndex( 0 );

    }

}

void HbComboBoxPrivate::setCompletion( bool completion )

{

    Q_Q( HbComboBox );

    if ( completion ) {

        if ( mCompleter ) {

            mProxyModel->setSourceModel( mModel );

            mProxyModel->sort( Qt::AscendingOrder );