Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTREEVIEW_P_H
+#define QTREEVIEW_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qabstractitemview_p.h"
+
+#ifndef QT_NO_TREEVIEW
+
+QT_BEGIN_NAMESPACE
+
+struct QTreeViewItem
+{
+    QTreeViewItem() : expanded(false), spanning(false), total(0), level(0), height(0) {}
+    QModelIndex index; // we remove items whenever the indexes are invalidated
+    uint expanded : 1;
+    uint spanning : 1;
+    uint total : 30; // total number of children visible
+    uint level : 16; // indentation
+    int height : 16; // row height
+};
+
+class QTreeViewPrivate : public QAbstractItemViewPrivate
+{
+    Q_DECLARE_PUBLIC(QTreeView)
+public:
+
+    QTreeViewPrivate()
+        : QAbstractItemViewPrivate(),
+          header(0), indent(20), lastViewedItem(0), defaultItemHeight(-1),
+          uniformRowHeights(false), rootDecoration(true),
+          itemsExpandable(true), sortingEnabled(false),
+          expandsOnDoubleClick(true),
+          allColumnsShowFocus(false),
+          animationsEnabled(false), columnResizeTimerID(0),
+          autoExpandDelay(-1), hoverBranch(-1), geometryRecursionBlock(false) {}
+
+    ~QTreeViewPrivate() {}
+    void initialize();
+
+    struct AnimatedOperation
+    {
+        enum Type { Expand, Collapse };
+        int item;
+        int top;
+        int duration;
+        Type type;
+        QPixmap before;
+        QPixmap after;
+    };
+
+    void expand(int item, bool emitSignal);
+    void collapse(int item, bool emitSignal);
+
+    void prepareAnimatedOperation(int item, AnimatedOperation::Type type);
+    void beginAnimatedOperation();
+    void _q_endAnimatedOperation();
+    void drawAnimatedOperation(QPainter *painter) const;
+    QPixmap renderTreeToPixmapForAnimation(const QRect &rect) const;
+
+    inline QRect animationRect() const
+        { return QRect(0, animatedOperation.top, viewport->width(),
+                       viewport->height() - animatedOperation.top); }
+
+    void _q_currentChanged(const QModelIndex&, const QModelIndex&);
+    void _q_columnsAboutToBeRemoved(const QModelIndex &, int, int);
+    void _q_columnsRemoved(const QModelIndex &, int, int);
+    void _q_modelAboutToBeReset();
+    void _q_animate();
+    void _q_sortIndicatorChanged(int column, Qt::SortOrder order);
+    void _q_modelDestroyed();
+
+    void layout(int item);
+
+    int pageUp(int item) const;
+    int pageDown(int item) const;
+
+    int itemHeight(int item) const;
+    int indentationForItem(int item) const;
+    int coordinateForItem(int item) const;
+    int itemAtCoordinate(int coordinate) const;
+
+    int viewIndex(const QModelIndex &index) const;
+    QModelIndex modelIndex(int i, int column = 0) const;
+
+    int firstVisibleItem(int *offset = 0) const;
+    int columnAt(int x) const;
+    bool hasVisibleChildren( const QModelIndex& parent) const;
+
+    void relayout(const QModelIndex &parent);
+    bool expandOrCollapseItemAtPos(const QPoint &pos);
+
+    void updateScrollBars();
+
+    int itemDecorationAt(const QPoint &pos) const;
+    QRect itemDecorationRect(const QModelIndex &index) const;
+
+
+    QList<QPair<int, int> > columnRanges(const QModelIndex &topIndex, const QModelIndex &bottomIndex) const;
+    void select(const QModelIndex &start, const QModelIndex &stop, QItemSelectionModel::SelectionFlags command);
+
+    QPair<int,int> startAndEndColumns(const QRect &rect) const;
+
+    void updateChildCount(const int parentItem, const int delta);
+    void rowsRemoved(const QModelIndex &parent,
+                     int start, int end, bool before);
+
+    void paintAlternatingRowColors(QPainter *painter, QStyleOptionViewItemV4 *option, int y, int bottom) const;
+
+    QHeaderView *header;
+    int indent;
+
+    mutable QVector<QTreeViewItem> viewItems;
+    mutable int lastViewedItem;
+    int defaultItemHeight; // this is just a number; contentsHeight() / numItems
+    bool uniformRowHeights; // used when all rows have the same height
+    bool rootDecoration;
+    bool itemsExpandable;
+    bool sortingEnabled;
+    bool expandsOnDoubleClick;
+    bool allColumnsShowFocus;
+
+    // used for drawing
+    mutable QPair<int,int> leftAndRight;
+    mutable int current;
+    mutable bool spanning;
+
+    // used when expanding and collapsing items
+    QSet<QPersistentModelIndex> expandedIndexes;
+    QStack<bool> expandParent;
+    AnimatedOperation animatedOperation;
+    bool animationsEnabled;
+
+    inline bool storeExpanded(const QPersistentModelIndex &idx) {
+        if (expandedIndexes.contains(idx))
+            return false;
+        expandedIndexes.insert(idx);
+        return true;
+    }
+
+    inline bool isIndexExpanded(const QModelIndex &idx) const {
+        //We first check if the idx is a QPersistentModelIndex, because creating QPersistentModelIndex is slow
+        return isPersistent(idx) && expandedIndexes.contains(idx);
+    }
+
+    // used when hiding and showing items
+    QSet<QPersistentModelIndex> hiddenIndexes;
+
+    inline bool isRowHidden(const QModelIndex &idx) const {
+        //We first check if the idx is a QPersistentModelIndex, because creating QPersistentModelIndex is slow
+        return isPersistent(idx) && hiddenIndexes.contains(idx);
+    }
+
+    inline bool isItemHiddenOrDisabled(int i) const {
+        if (i < 0 || i >= viewItems.count())
+            return false;
+        const QModelIndex index = viewItems.at(i).index;
+        return isRowHidden(index) || !isIndexEnabled(index);
+    }
+
+    inline int above(int item) const
+        { int i = item; while (isItemHiddenOrDisabled(--item)){} return item < 0 ? i : item; }
+    inline int below(int item) const
+        { int i = item; while (isItemHiddenOrDisabled(++item)){} return item >= viewItems.count() ? i : item; }
+    inline void invalidateHeightCache(int item) const
+        { viewItems[item].height = 0; }
+
+    // used for spanning rows
+    QVector<QPersistentModelIndex> spanningIndexes;
+
+    // used for updating resized columns
+    int columnResizeTimerID;
+    QList<int> columnsToUpdate;
+
+    // used for the automatic opening of nodes during DND
+    int autoExpandDelay;
+    QBasicTimer openTimer;
+
+    // used for drawing hilighted expand/collapse indicators
+    int hoverBranch;
+
+    // used for blocking recursion when calling setViewportMargins from updateGeometries
+    bool geometryRecursionBlock;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_TREEVIEW
+
+#endif // QTREEVIEW_P_H