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**
** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the QtWidgets module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL21$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
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****************************************************************************/

#ifndef QTREEVIEW_H
#define QTREEVIEW_H

#include <QtWidgets/qabstractitemview.h>

QT_BEGIN_NAMESPACE


#ifndef QT_NO_TREEVIEW

class QTreeViewPrivate;
class QHeaderView;

class Q_WIDGETS_EXPORT QTreeView : public QAbstractItemView
{
    Q_OBJECT
    Q_PROPERTY(int autoExpandDelay READ autoExpandDelay WRITE setAutoExpandDelay)
    Q_PROPERTY(int indentation READ indentation WRITE setIndentation RESET resetIndentation)
    Q_PROPERTY(bool rootIsDecorated READ rootIsDecorated WRITE setRootIsDecorated)
    Q_PROPERTY(bool uniformRowHeights READ uniformRowHeights WRITE setUniformRowHeights)
    Q_PROPERTY(bool itemsExpandable READ itemsExpandable WRITE setItemsExpandable)
    Q_PROPERTY(bool sortingEnabled READ isSortingEnabled WRITE setSortingEnabled)
    Q_PROPERTY(bool animated READ isAnimated WRITE setAnimated)
    Q_PROPERTY(bool allColumnsShowFocus READ allColumnsShowFocus WRITE setAllColumnsShowFocus)
    Q_PROPERTY(bool wordWrap READ wordWrap WRITE setWordWrap)
    Q_PROPERTY(bool headerHidden READ isHeaderHidden WRITE setHeaderHidden)
    Q_PROPERTY(bool expandsOnDoubleClick READ expandsOnDoubleClick WRITE setExpandsOnDoubleClick)

public:
    explicit QTreeView(QWidget *parent = Q_NULLPTR);
    ~QTreeView();

    void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
    void setRootIndex(const QModelIndex &index) Q_DECL_OVERRIDE;
    void setSelectionModel(QItemSelectionModel *selectionModel) Q_DECL_OVERRIDE;

    QHeaderView *header() const;
    void setHeader(QHeaderView *header);

    int autoExpandDelay() const;
    void setAutoExpandDelay(int delay);

    int indentation() const;
    void setIndentation(int i);
    void resetIndentation();

    bool rootIsDecorated() const;
    void setRootIsDecorated(bool show);

    bool uniformRowHeights() const;
    void setUniformRowHeights(bool uniform);

    bool itemsExpandable() const;
    void setItemsExpandable(bool enable);

    bool expandsOnDoubleClick() const;
    void setExpandsOnDoubleClick(bool enable);

    int columnViewportPosition(int column) const;
    int columnWidth(int column) const;
    void setColumnWidth(int column, int width);
    int columnAt(int x) const;

    bool isColumnHidden(int column) const;
    void setColumnHidden(int column, bool hide);

    bool isHeaderHidden() const;
    void setHeaderHidden(bool hide);

    bool isRowHidden(int row, const QModelIndex &parent) const;
    void setRowHidden(int row, const QModelIndex &parent, bool hide);

    bool isFirstColumnSpanned(int row, const QModelIndex &parent) const;
    void setFirstColumnSpanned(int row, const QModelIndex &parent, bool span);

    bool isExpanded(const QModelIndex &index) const;
    void setExpanded(const QModelIndex &index, bool expand);

    void setSortingEnabled(bool enable);
    bool isSortingEnabled() const;

    void setAnimated(bool enable);
    bool isAnimated() const;

    void setAllColumnsShowFocus(bool enable);
    bool allColumnsShowFocus() const;

    void setWordWrap(bool on);
    bool wordWrap() const;

    void setTreePosition(int logicalIndex);
    int treePosition() const;

    void keyboardSearch(const QString &search) Q_DECL_OVERRIDE;

    QRect visualRect(const QModelIndex &index) const Q_DECL_OVERRIDE;
    void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) Q_DECL_OVERRIDE;
    QModelIndex indexAt(const QPoint &p) const Q_DECL_OVERRIDE;
    QModelIndex indexAbove(const QModelIndex &index) const;
    QModelIndex indexBelow(const QModelIndex &index) const;

    void doItemsLayout() Q_DECL_OVERRIDE;
    void reset() Q_DECL_OVERRIDE;

    void sortByColumn(int column, Qt::SortOrder order);

    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>()) Q_DECL_OVERRIDE;
    void selectAll() Q_DECL_OVERRIDE;

Q_SIGNALS:
    void expanded(const QModelIndex &index);
    void collapsed(const QModelIndex &index);

public Q_SLOTS:
    void hideColumn(int column);
    void showColumn(int column);
    void expand(const QModelIndex &index);
    void collapse(const QModelIndex &index);
    void resizeColumnToContents(int column);
    void sortByColumn(int column);
    void expandAll();
    void collapseAll();
    void expandToDepth(int depth);

protected Q_SLOTS:
    void columnResized(int column, int oldSize, int newSize);
    void columnCountChanged(int oldCount, int newCount);
    void columnMoved();
    void reexpand();
    void rowsRemoved(const QModelIndex &parent, int first, int last);

protected:
    QTreeView(QTreeViewPrivate &dd, QWidget *parent = Q_NULLPTR);
    void scrollContentsBy(int dx, int dy) Q_DECL_OVERRIDE;
    void rowsInserted(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;
    void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) Q_DECL_OVERRIDE;

    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers) Q_DECL_OVERRIDE;
    int horizontalOffset() const Q_DECL_OVERRIDE;
    int verticalOffset() const Q_DECL_OVERRIDE;

    void setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) Q_DECL_OVERRIDE;
    QRegion visualRegionForSelection(const QItemSelection &selection) const Q_DECL_OVERRIDE;
    QModelIndexList selectedIndexes() const Q_DECL_OVERRIDE;

    void timerEvent(QTimerEvent *event) Q_DECL_OVERRIDE;
    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;

    void drawTree(QPainter *painter, const QRegion &region) const;
    virtual void drawRow(QPainter *painter,
                         const QStyleOptionViewItem &options,
                         const QModelIndex &index) const;
    virtual void drawBranches(QPainter *painter,
                              const QRect &rect,
                              const QModelIndex &index) const;

    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void mouseDoubleClickEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
#ifndef QT_NO_DRAGANDDROP
    void dragMoveEvent(QDragMoveEvent *event) Q_DECL_OVERRIDE;
#endif
    bool viewportEvent(QEvent *event) Q_DECL_OVERRIDE;

    void updateGeometries() Q_DECL_OVERRIDE;

    QSize viewportSizeHint() const Q_DECL_OVERRIDE;

    int sizeHintForColumn(int column) const Q_DECL_OVERRIDE;
    int indexRowSizeHint(const QModelIndex &index) const;
    int rowHeight(const QModelIndex &index) const;

    void horizontalScrollbarAction(int action) Q_DECL_OVERRIDE;

    bool isIndexHidden(const QModelIndex &index) const Q_DECL_OVERRIDE;
    void selectionChanged(const QItemSelection &selected,
                          const QItemSelection &deselected) Q_DECL_OVERRIDE;
    void currentChanged(const QModelIndex &current, const QModelIndex &previous) Q_DECL_OVERRIDE;

private:
    friend class QAccessibleTable;
    friend class QAccessibleTree;
    friend class QAccessibleTableCell;
    int visualIndex(const QModelIndex &index) const;

    Q_DECLARE_PRIVATE(QTreeView)
    Q_DISABLE_COPY(QTreeView)
#ifndef QT_NO_ANIMATION
    Q_PRIVATE_SLOT(d_func(), void _q_endAnimatedOperation())
#endif //QT_NO_ANIMATION
    Q_PRIVATE_SLOT(d_func(), void _q_modelAboutToBeReset())
    Q_PRIVATE_SLOT(d_func(), void _q_sortIndicatorChanged(int column, Qt::SortOrder order))
};

#endif // QT_NO_TREEVIEW

QT_END_NAMESPACE

#endif // QTREEVIEW_H
