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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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// System includes
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#include <QGraphicsSceneEvent>
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// User includes
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#include "radiostripbase.h"
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#include "radiologger.h"
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// Constants
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/*!
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*
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*/
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RadioStripBase::RadioStripBase( QGraphicsItem* parent ) :
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HbScrollArea( parent ),
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mAutoScrollTime( 0 ),
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mStripContainer( new HbWidget( this ) ),
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mModel( 0 ),
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mIsCyclic( true ),
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mAutoCenter( false ),
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mSpacing( 0 ),
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mItemPoolParent( new QGraphicsWidget( NULL ) ),
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mCurrentIndex( 0 ),
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mPressedIndex( 0 ),
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mStripLength( 0 ),
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mContentsLength( 0 )
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{
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setClampingStyle( HbScrollArea::NoClamping );
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setScrollDirections( Qt::Horizontal );
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setFlag( QGraphicsItem::ItemClipsChildrenToShape, true );
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setContentWidget( mStripContainer );
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setFrictionEnabled( true );
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setLongPressEnabled( false );
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setHorizontalScrollBarPolicy( HbScrollArea::ScrollBarAlwaysOff );
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setVerticalScrollBarPolicy( HbScrollArea::ScrollBarAlwaysOff );
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// mItemParent is used to hold the unused QGraphicsItem's in the pool. It's visibility is set to false
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// so the visibility of the items doesn't need to be modified.
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mItemPoolParent->setVisible( false );
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connectAndTest( this, SIGNAL(scrollPositionChanged(QPointF)),
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this, SLOT(scrollPositionChanged(QPointF)));
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}
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/*!
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*
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*/
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RadioStripBase::~RadioStripBase()
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{
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}
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/*!
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*
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*/
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void RadioStripBase::setAutoScrollTime( const int time )
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{
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mAutoScrollTime = time;
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}
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/*!
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*
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*/
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int RadioStripBase::autoScrollTime() const
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{
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return mAutoScrollTime;
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}
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/*!
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*
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*/
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void RadioStripBase::setModel( QAbstractItemModel* model )
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{
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if ( mModel != model )
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{
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// if ( mModel )
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// {
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// disconnectDataModel();
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// }
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mModel = model;
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if ( mModel )
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{
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// connectDataModel();
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mCurrentIndex = 0;
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populateAndLayout();
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}
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}
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}
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/*!
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*
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*/
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QAbstractItemModel* RadioStripBase::model() const
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{
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return mModel;
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}
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/*!
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*
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*/
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void RadioStripBase::setCyclic( bool isCyclic )
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{
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mIsCyclic = isCyclic;
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}
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/*!
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*
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*/
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void RadioStripBase::setSpacing( qreal spacing )
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{
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if ( mSpacing != spacing )
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{
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mSpacing = spacing;
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prepareGeometryChange();
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populateAndLayout();
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update();
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updateGeometry();
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}
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}
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/*!
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*
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*/
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void RadioStripBase::setAutoCenter( bool autoCenter )
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{
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mAutoCenter = autoCenter;
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}
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/*!
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*
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*/
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void RadioStripBase::setItemSize( const QSizeF& size )
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{
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if ( mItemSize != size ) {
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mItemSize = size;
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prepareGeometryChange();
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populateAndLayout();
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update();
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updateGeometry();
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}
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}
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/*!
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*
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*/
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void RadioStripBase::setIndex( int index, bool animateToCenter )
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{
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Q_UNUSED( animateToCenter )
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// Sanity checks
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if ( !mModel || ( !mIsCyclic && ( index < 0 || index >= mModel->rowCount() ) ) ) {
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return;
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}
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const int oldIndex = mCurrentIndex;
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if ( mIsCyclic )
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{
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int numRows = mModel->rowCount();
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index = (index + numRows) % numRows;
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}
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Q_ASSERT( index >= 0 );
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mCurrentIndex = index;
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updateItemWithIndex( mCurrentIndex );
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updateItemWithIndex( oldIndex );
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}
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/*!
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* \reimp
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*/
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void RadioStripBase::resizeEvent( QGraphicsSceneResizeEvent* event )
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{
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Q_UNUSED( event );
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populateAndLayout();
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}
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/*!
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* \reimp
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*/
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void RadioStripBase::mousePressEvent( QGraphicsSceneMouseEvent* event )
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{
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if ( event->button() != Qt::LeftButton || !mModel || !mModel->rowCount() )
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{
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event->ignore();
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return;
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}
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HbScrollArea::mousePressEvent( event );
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}
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/*!
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* \reimp
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*/
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void RadioStripBase::mouseReleaseEvent( QGraphicsSceneMouseEvent* event )
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{
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if ( event->button() != Qt::LeftButton )
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{
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event->ignore();
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return;
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}
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HbScrollArea::mouseReleaseEvent( event );
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}
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/*!
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* Private slot
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*/
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void RadioStripBase::scrollPositionChanged( QPointF newPosition )
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{
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adjustItems();
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scrollPosChanged( newPosition );
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}
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/*!
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*
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*/
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void RadioStripBase::moveAllItemsToPool()
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{
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// set parent of all items to pool
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foreach( QGraphicsItem* item, mItemAtSlot )
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{
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item->setParentItem( mItemPoolParent );
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}
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// move all items to pool
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mItemPool += mItemAtSlot;
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mItemAtSlot.clear();
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mIndexAtSlot.clear();
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}
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/*!
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*
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*/
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void RadioStripBase::populateAndLayout()
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{
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moveAllItemsToPool();
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if ( !mModel || mModel->rowCount() == 0 )
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{
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return;
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}
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mStripLength = boundingRect().width();
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qreal itemSize = mItemSize.width();
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mContentsLength = mModel->rowCount() * (itemSize + mSpacing) + mSpacing;
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if ( mIsCyclic )
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{
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// if treating the items cyclically, double the content area so it can
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// be shifted back and forth as you scroll
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mContentsLength = mModel->rowCount() * (itemSize + mSpacing);
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mContentsLength *= 2.0;
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}
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qreal currPos = mSpacing;
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for ( int i = 0; i < mModel->rowCount(); ++i ) {
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if ( currPos > mStripLength )
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{
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break;
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}
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QGraphicsItem* item = constructItem( i, true );
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if ( item )
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{
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item->setPos( QPointF( currPos, mSpacing ) );
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currPos += itemSize + mSpacing;
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}
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}
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QRectF contentsRect(0,0,0,0);
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contentsRect.setBottom( itemSize + 2 * mSpacing );
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contentsRect.setRight( mContentsLength );
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mStripContainer->setGeometry( contentsRect );
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if ( mCurrentIndex >= 0 )
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{
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setIndex( mCurrentIndex, false );
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}
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}
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/*!
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*
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*/
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QGraphicsItem* RadioStripBase::constructItem( int index, bool append )
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{
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QGraphicsItem* item = getFromPool();
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if ( mIsCyclic )
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{
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Q_ASSERT( index >= 0 && index < 2 * mModel->rowCount() );
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updateItemPrimitive( item, index % mModel->rowCount() );
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}
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else
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{
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Q_ASSERT( index >= 0 && index < mModel->rowCount() );
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updateItemPrimitive( item, index );
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}
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item->setParentItem( mStripContainer );
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if ( append )
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{
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mItemAtSlot.append( item );
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mIndexAtSlot.append( index );
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}
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else
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{
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mItemAtSlot.prepend( item );
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mIndexAtSlot.prepend( index );
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}
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return item;
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}
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/*!
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*
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*/
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QGraphicsItem* RadioStripBase::getFromPool()
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{
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QGraphicsItem* item = 0;
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if ( mItemPool.isEmpty() )
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{
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item = createItemPrimitive( this );
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}
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else
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{
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item = mItemPool.takeFirst();
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}
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return item;
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}
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/*!
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*
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*/
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void RadioStripBase::returnToPool( QGraphicsItem* item )
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{
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// Unparent the item so it doesn't get deleted
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item->setParentItem( mItemPoolParent );
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mItemPool.append( item );
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}
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/*!
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* Returns starting coordinate of the item with the specified index
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*/
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qreal RadioStripBase::indexToOffset( int index )
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{
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return index * ( mItemSize.width() + mSpacing ) + mSpacing;
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}
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/*!
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* Returns item index for specified offset amount into the content
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*/
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int RadioStripBase::offsetToIndex( qreal offset )
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{
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const int rows = mModel->rowCount();
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int index = (int)( ( offset - mSpacing) / ( mItemSize.width() + mSpacing ) );
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if ( mIsCyclic )
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{
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return qBound( 0, index, 2 * rows - 1 );
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}
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return qBound( 0, index, rows - 1 );
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}
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/*!
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* updates items with specified index value
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*/
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void RadioStripBase::updateItemWithIndex( int index )
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{
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if( index >= 0 )
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{
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QList<QGraphicsItem *>::const_iterator item = mItemAtSlot.constBegin();
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QList<QGraphicsItem *>::const_iterator itemsEnd = mItemAtSlot.constEnd();
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QList<int>::const_iterator itemIndex = mIndexAtSlot.constBegin();
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const int rowCount = mModel->rowCount();
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// Find all items with this index (can be 2 in special cycling case)
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for( ; item != itemsEnd; ++item, ++itemIndex )
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{
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if( index == *itemIndex || index == *itemIndex - rowCount )
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{
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// update those items
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updateItemPrimitive( *item, index );
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}
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}
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}
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}
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/*!
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* Updates items during scrolling: removing invisible items and adding items that became visible
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*/
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void RadioStripBase::adjustItems()
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{
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qreal contentPos = mStripContainer->pos().x();
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if ( mIsCyclic )
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{
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if ( -contentPos < 0 )
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{
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// trying to display off the left end of the strip, so
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// shift the strip one length to the left
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contentPos -= mContentsLength * 0.5;
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mStripContainer->setPos( QPointF ( contentPos, mStripContainer->pos().y() ) );
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} else if (-contentPos > mContentsLength * 0.5) {
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// trying to display off the right end of the strip, so
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// shift the strip one length to the right
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contentPos += mContentsLength * 0.5;
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mStripContainer->setPos( QPointF ( contentPos, mStripContainer->pos().y() ) );
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}
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}
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// find the first and last indices of the visible items
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int firstVisibleIndex = offsetToIndex( -contentPos );
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int lastVisibleIndex = offsetToIndex( -contentPos + mStripLength );
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// remove items at the start that are no longer visible
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while ( !mIndexAtSlot.isEmpty() )
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{
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int firstSlotIndex = mIndexAtSlot.first();
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if ( firstVisibleIndex <= firstSlotIndex )
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{
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break;
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}
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returnToPool( mItemAtSlot.first() );
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mItemAtSlot.removeFirst();
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mIndexAtSlot.removeFirst();
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}
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// remove items at the end that are no longer visible
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while ( !mIndexAtSlot.isEmpty() )
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{
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int lastSlotIndex = mIndexAtSlot.last();
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if ( lastVisibleIndex >= lastSlotIndex )
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{
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break;
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}
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returnToPool( mItemAtSlot.last() );
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mItemAtSlot.removeLast();
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mIndexAtSlot.removeLast();
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}
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if ( mItemAtSlot.isEmpty() )
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{
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// fill area with all needed items
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for ( int i = firstVisibleIndex; i <= lastVisibleIndex; ++i )
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{
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QGraphicsItem* item = constructItem( i, true );
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if ( item )
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{
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item->setPos( QPointF( indexToOffset( i ), mSpacing ) );
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}
|
|
484 |
}
|
|
485 |
}
|
|
486 |
else
|
|
487 |
{
|
|
488 |
// add missing items at the front
|
|
489 |
int firstItemToCreate = mIndexAtSlot.first()-1;
|
|
490 |
for ( int i = firstItemToCreate; i >= firstVisibleIndex; --i )
|
|
491 |
{
|
|
492 |
QGraphicsItem* item = constructItem( i, false );
|
|
493 |
if ( item )
|
|
494 |
{
|
|
495 |
item->setPos( QPointF( indexToOffset( i ), mSpacing ) );
|
|
496 |
}
|
|
497 |
}
|
|
498 |
|
|
499 |
// add missing items at the end
|
|
500 |
firstItemToCreate = mIndexAtSlot.last()+1;
|
|
501 |
for ( int i = firstItemToCreate; i <= lastVisibleIndex; ++i )
|
|
502 |
{
|
|
503 |
QGraphicsItem* item = constructItem( i, true );
|
|
504 |
if ( item )
|
|
505 |
{
|
|
506 |
item->setPos( QPointF( indexToOffset( i ), mSpacing ) );
|
|
507 |
}
|
|
508 |
}
|
|
509 |
}
|
|
510 |
}
|