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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQUICKITEMVIEW_P_P_H
#define QQUICKITEMVIEW_P_P_H
#include "qquickitemview_p.h"
#include "qquickflickable_p_p.h"
#include "qquickvisualdatamodel_p.h"
#include <private/qdeclarativechangeset_p.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Declarative)
class FxViewItem
{
public:
FxViewItem(QQuickItem *, bool own);
~FxViewItem();
// these are positions and sizes along the current direction of scrolling/flicking
virtual qreal position() const = 0;
virtual qreal endPosition() const = 0;
virtual qreal size() const = 0;
virtual qreal sectionSize() const = 0;
virtual bool contains(qreal x, qreal y) const = 0;
QQuickItem *item;
bool ownItem;
int index;
QQuickItemViewAttached *attached;
};
class QQuickItemViewChangeSet
{
public:
QQuickItemViewChangeSet();
bool hasPendingChanges() const;
void prepare(int currentIndex, int count);
void reset();
void applyChanges(const QDeclarativeChangeSet &changeSet);
int itemCount;
int newCurrentIndex;
QDeclarativeChangeSet pendingChanges;
QHash<QDeclarativeChangeSet::MoveKey, FxViewItem *> removedItems;
bool active : 1;
bool currentChanged : 1;
bool currentRemoved : 1;
};
class QQuickItemViewPrivate : public QQuickFlickablePrivate
{
Q_DECLARE_PUBLIC(QQuickItemView)
public:
QQuickItemViewPrivate();
struct InsertionsResult {
QList<FxViewItem *> addedItems;
QList<FxViewItem *> movedBackwards;
qreal sizeAddedBeforeVisible;
InsertionsResult() : sizeAddedBeforeVisible(0) {}
};
enum BufferMode { NoBuffer = 0x00, BufferBefore = 0x01, BufferAfter = 0x02 };
enum MovementReason { Other, SetIndex, Mouse };
bool isValid() const;
qreal position() const;
qreal size() const;
qreal startPosition() const;
qreal endPosition() const;
qreal contentStartPosition() const;
int findLastVisibleIndex(int defaultValue = -1) const;
FxViewItem *visibleItem(int modelIndex) const;
FxViewItem *firstVisibleItem() const;
int mapFromModel(int modelIndex) const;
virtual void init();
virtual void clear();
virtual void updateViewport();
void regenerate();
void layout();
void refill();
void refill(qreal from, qreal to, bool doBuffer = false);
void mirrorChange();
FxViewItem *createItem(int modelIndex, bool asynchronous = false);
virtual void releaseItem(FxViewItem *item);
QQuickItem *createHighlightItem();
QQuickItem *createComponentItem(QDeclarativeComponent *component, bool receiveItemGeometryChanges, bool createDefault = false);
void updateCurrent(int modelIndex);
void updateTrackedItem();
void updateUnrequestedIndexes();
void updateUnrequestedPositions();
void updateVisibleIndex();
void positionViewAtIndex(int index, int mode);
void applyPendingChanges();
bool applyModelChanges();
void checkVisible() const;
void markExtentsDirty() {
if (layoutOrientation() == Qt::Vertical)
vData.markExtentsDirty();
else
hData.markExtentsDirty();
}
QDeclarativeGuard<QQuickVisualModel> model;
QVariant modelVariant;
int itemCount;
int buffer;
int bufferMode;
Qt::LayoutDirection layoutDirection;
MovementReason moveReason;
QList<FxViewItem *> visibleItems;
int visibleIndex;
int currentIndex;
FxViewItem *currentItem;
FxViewItem *trackedItem;
QHash<QQuickItem*,int> unrequestedItems;
int requestedIndex;
FxViewItem *requestedItem;
QQuickItemViewChangeSet currentChanges;
// XXX split into struct
QDeclarativeComponent *highlightComponent;
FxViewItem *highlight;
int highlightRange; // enum value
qreal highlightRangeStart;
qreal highlightRangeEnd;
int highlightMoveDuration;
QDeclarativeComponent *headerComponent;
FxViewItem *header;
QDeclarativeComponent *footerComponent;
FxViewItem *footer;
mutable qreal minExtent;
mutable qreal maxExtent;
bool ownModel : 1;
bool wrap : 1;
bool deferredRelease : 1;
bool inApplyModelChanges : 1;
bool inViewportMoved : 1;
bool forceLayout : 1;
bool currentIndexCleared : 1;
bool haveHighlightRange : 1;
bool autoHighlight : 1;
bool highlightRangeStartValid : 1;
bool highlightRangeEndValid : 1;
bool fillCacheBuffer : 1;
bool inRequest : 1;
bool requestedAsync : 1;
protected:
virtual Qt::Orientation layoutOrientation() const = 0;
virtual bool isContentFlowReversed() const = 0;
virtual qreal positionAt(int index) const = 0;
virtual qreal endPositionAt(int index) const = 0;
virtual qreal originPosition() const = 0;
virtual qreal lastPosition() const = 0;
virtual qreal headerSize() const = 0;
virtual qreal footerSize() const = 0;
virtual bool showHeaderForIndex(int index) const = 0;
virtual bool showFooterForIndex(int index) const = 0;
virtual void updateHeader() = 0;
virtual void updateFooter() = 0;
virtual void createHighlight() = 0;
virtual void updateHighlight() = 0;
virtual void resetHighlightPosition() = 0;
virtual void setPosition(qreal pos) = 0;
virtual void fixupPosition() = 0;
virtual bool addVisibleItems(qreal fillFrom, qreal fillTo, bool doBuffer) = 0;
virtual bool removeNonVisibleItems(qreal bufferFrom, qreal bufferTo) = 0;
virtual void visibleItemsChanged() = 0;
virtual FxViewItem *newViewItem(int index, QQuickItem *item) = 0;
virtual void repositionPackageItemAt(QQuickItem *item, int index) = 0;
virtual void resetItemPosition(FxViewItem *item, FxViewItem *toItem) = 0;
virtual void resetFirstItemPosition() = 0;
virtual void moveItemBy(FxViewItem *item, qreal forwards, qreal backwards) = 0;
virtual void layoutVisibleItems() = 0;
virtual void changedVisibleIndex(int newIndex) = 0;
virtual bool applyInsertionChange(const QDeclarativeChangeSet::Insert &, FxViewItem *, InsertionsResult *) = 0;
virtual bool needsRefillForAddedOrRemovedIndex(int) const { return false; }
virtual void initializeViewItem(FxViewItem *) {}
virtual void initializeCurrentItem() {}
virtual void updateSections() {}
virtual void itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry);
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QQUICKITEMVIEW_P_P_H
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