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/***************************************************************************
* Copyright (C) 2011 by Peter Penz <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#ifndef KITEMLISTVIEWLAYOUTER_H
#define KITEMLISTVIEWLAYOUTER_H
#include <libdolphin_export.h>
#include <QObject>
#include <QRectF>
#include <QSet>
#include <QSizeF>
class KItemModelBase;
class KItemListSizeHintResolver;
class LIBDOLPHINPRIVATE_EXPORT KItemListViewLayouter : public QObject
{
Q_OBJECT
public:
KItemListViewLayouter(QObject* parent = 0);
virtual ~KItemListViewLayouter();
void setScrollOrientation(Qt::Orientation orientation);
Qt::Orientation scrollOrientation() const;
void setSize(const QSizeF& size);
QSizeF size() const;
void setItemSize(const QSizeF& size);
QSizeF itemSize() const;
/**
* Sets the height of the header that is always aligned
* at the top. A height of <= 0.0 means that no header is
* used.
*/
void setHeaderHeight(qreal height);
qreal headerHeight() const;
/**
* Sets the height of the group header that is used
* to indicate a new item group.
*/
void setGroupHeaderHeight(qreal height);
qreal groupHeaderHeight() const;
// TODO: add note that offset can be < 0 or > maximumOffset!
void setScrollOffset(qreal scrollOffset);
qreal scrollOffset() const;
qreal maximumScrollOffset() const;
void setItemOffset(qreal scrollOffset);
qreal itemOffset() const;
qreal maximumItemOffset() const;
void setModel(const KItemModelBase* model);
const KItemModelBase* model() const;
void setSizeHintResolver(const KItemListSizeHintResolver* sizeHintResolver);
const KItemListSizeHintResolver* sizeHintResolver() const;
/**
* @return The first (at least partly) visible index. -1 is returned
* if the item count is 0.
*/
int firstVisibleIndex() const;
/**
* @return The last (at least partly) visible index. -1 is returned
* if the item count is 0.
*/
int lastVisibleIndex() const;
/**
* @return Rectangle of the item with the index \a index.
* The top/left of the bounding rectangle is related to
* the top/left of the KItemListView. An empty rectangle
* is returned if an invalid index is given.
*/
QRectF itemRect(int index) const;
QRectF groupHeaderRect(int index) const;
/**
* @return Maximum number of (at least partly) visible items for
* the given size.
*/
int maximumVisibleItems() const;
/**
* @return True if the item with the index \p itemIndex
* is the first item within a group.
*/
bool isFirstGroupItem(int itemIndex) const;
void markAsDirty();
private:
void doLayout();
void updateVisibleIndexes();
bool createGroupHeaders();
/**
* @return Minimum width of group headers when grouping is enabled in the horizontal
* alignment mode. The header alignment is done like this:
* Header-1 Header-2 Header-3
* Item 1 Item 4 Item 7
* Item 2 Item 5 Item 8
* Item 3 Item 6 Item 9
*/
qreal minimumGroupHeaderWidth() const;
private:
bool m_dirty;
bool m_visibleIndexesDirty;
Qt::Orientation m_scrollOrientation;
QSizeF m_size;
QSizeF m_itemSize;
qreal m_headerHeight;
const KItemModelBase* m_model;
const KItemListSizeHintResolver* m_sizeHintResolver;
qreal m_scrollOffset;
qreal m_maximumScrollOffset;
qreal m_itemOffset;
qreal m_maximumItemOffset;
int m_firstVisibleIndex;
int m_lastVisibleIndex;
qreal m_columnWidth;
qreal m_xPosInc;
int m_columnCount;
// Stores all item indexes that are the first item of a group.
// Assures fast access for KItemListViewLayouter::isFirstGroupItem().
QSet<int> m_groupItemIndexes;
qreal m_groupHeaderHeight;
QList<QRectF> m_itemRects;
};
#endif
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