QTreeView 类

QTreeView 类为树视图提供默认模型/视图实现。更多...

头：	#include <QTreeView>
qmake:	QT += widgets
继承：	QAbstractItemView
继承者：	QTreeWidget

特性

allColumnsShowFocus : bool
animated : bool
autoExpandDelay : int
expandsOnDoubleClick : bool
headerHidden : bool
indentation : int

itemsExpandable : bool
rootIsDecorated : bool
sortingEnabled : bool
uniformRowHeights : bool
wordWrap : bool

公共函数

	QTreeView (QWidget * parent = nullptr)
virtual	~QTreeView ()
bool	allColumnsShowFocus () const
int	autoExpandDelay () const
int	columnAt (int x ) const
int	columnViewportPosition (int column ) const
int	columnWidth (int column ) const
bool	expandsOnDoubleClick () const
QHeaderView *	header () const
int	indentation () const
QModelIndex	indexAbove (const QModelIndex & index ) const
QModelIndex	indexBelow (const QModelIndex & index ) const
bool	isAnimated () const
bool	isColumnHidden (int column ) const
bool	isExpanded (const QModelIndex & index ) const
bool	isFirstColumnSpanned (int row , const QModelIndex & parent ) const
bool	isHeaderHidden () const
bool	isRowHidden (int row , const QModelIndex & parent ) const
bool	isSortingEnabled () const
bool	itemsExpandable () const
void	resetIndentation ()
bool	rootIsDecorated () const
void	setAllColumnsShowFocus (bool enable )
void	setAnimated (bool enable )
void	setAutoExpandDelay (int delay )
void	setColumnHidden (int column , bool hide )
void	setColumnWidth (int column , int width )
void	setExpanded (const QModelIndex & index , bool expanded )
void	setExpandsOnDoubleClick (bool enable )
void	setFirstColumnSpanned (int row , const QModelIndex & parent , bool span )
void	setHeader (QHeaderView * header )
void	setHeaderHidden (bool hide )
void	setIndentation (int i )
void	setItemsExpandable (bool enable )
void	setRootIsDecorated (bool show )
void	setRowHidden (int row , const QModelIndex & parent , bool hide )
void	setSortingEnabled (bool enable )
void	setTreePosition (int index )
void	setUniformRowHeights (bool uniform )
void	setWordWrap (bool on )
int	treePosition () const
bool	uniformRowHeights () const
bool	wordWrap () const

重实现公共函数

virtual void	dataChanged (const QModelIndex & topLeft , const QModelIndex & bottomRight , const QVector<int> & roles = QVector<int>()) override
virtual QModelIndex	indexAt (const QPoint & point ) const override
virtual void	keyboardSearch (const QString & search ) override
virtual void	reset () override
virtual void	scrollTo (const QModelIndex & index , QAbstractItemView::ScrollHint hint = EnsureVisible) override
virtual void	selectAll () override
virtual void	setModel (QAbstractItemModel * model ) override
virtual void	setRootIndex (const QModelIndex & index ) override
virtual void	setSelectionModel (QItemSelectionModel * selectionModel ) override
virtual QRect	visualRect (const QModelIndex & index ) const override

公共槽

void	collapse (const QModelIndex & index )
void	collapseAll ()
void	expand (const QModelIndex & index )
void	expandAll ()
void	expandRecursively (const QModelIndex & index , int depth = -1)
void	expandToDepth (int depth )
void	hideColumn (int column )
void	resizeColumnToContents (int column )
void	showColumn (int column )
void	sortByColumn (int column , Qt::SortOrder order )

信号

void	collapsed (const QModelIndex & index )
void	expanded (const QModelIndex & index )

保护函数

virtual void	drawBranches (QPainter * painter , const QRect & rect , const QModelIndex & index ) const
virtual void	drawRow (QPainter * painter , const QStyleOptionViewItem & option , const QModelIndex & index ) const
void	drawTree (QPainter * painter , const QRegion & region ) const
int	indexRowSizeHint (const QModelIndex & index ) const
int	rowHeight (const QModelIndex & index ) const

重实现保护函数

virtual void	currentChanged (const QModelIndex & current , const QModelIndex & 上一 ) override
virtual void	dragMoveEvent (QDragMoveEvent * event ) override
virtual int	horizontalOffset () const override
virtual bool	isIndexHidden (const QModelIndex & index ) const override
virtual void	keyPressEvent (QKeyEvent * event ) override
virtual void	mouseDoubleClickEvent (QMouseEvent * event ) override
virtual void	mouseMoveEvent (QMouseEvent * event ) override
virtual void	mousePressEvent (QMouseEvent * event ) override
virtual void	mouseReleaseEvent (QMouseEvent * event ) override
virtual QModelIndex	moveCursor (QAbstractItemView::CursorAction cursorAction , Qt::KeyboardModifiers modifiers ) override
virtual void	paintEvent (QPaintEvent * event ) override
virtual void	rowsAboutToBeRemoved (const QModelIndex & parent , int start , int end ) override
virtual void	rowsInserted (const QModelIndex & parent , int start , int end ) override
virtual void	scrollContentsBy (int dx , int dy ) override
virtual QModelIndexList	selectedIndexes () const override
virtual void	selectionChanged (const QItemSelection & selected , const QItemSelection & deselected ) override
virtual void	setSelection (const QRect & rect , QItemSelectionModel::SelectionFlags 命令 ) override
virtual int	sizeHintForColumn (int column ) const override
virtual void	timerEvent (QTimerEvent * event ) override
virtual void	updateGeometries () override
virtual int	verticalOffset () const override
virtual bool	viewportEvent (QEvent * event ) override
virtual QSize	viewportSizeHint () const override
virtual QRegion	visualRegionForSelection (const QItemSelection & selection ) const override

保护槽

void	columnCountChanged (int oldCount , int newCount )
void	columnMoved ()
void	columnResized (int column , int oldSize , int newSize )
void	rowsRemoved (const QModelIndex & parent , int start , int end )

详细描述

QTreeView 实现来自模型的项的树表示。此类用于提供标准分层列表，先前提供是通过 QListView 类，但使用由 Qt 模型/视图体系结构提供的方式更灵活。

QTreeView 类是一种模型/视图类且属于 Qt 的模型/视图框架 .

QTreeView 实现的接口定义通过 QAbstractItemView 类以允许它显示提供数据，通过模型派生自 QAbstractItemModel 类。

构建树视图以显示来自模型的数据很简单。在以下范例中，目录内容的提供通过 QFileSystemModel 并作为树显示：

    QFileSystemModel *model = new QFileSystemModel;
    model->setRootPath(QDir::currentPath());
    QTreeView *tree = new QTreeView(splitter);
    tree->setModel(model);

模型/视图体系结构确保树视图内容随模型改变更新。

拥有子级的项可以处于展开 (子级可见) 或折叠 (隐藏子级) 状态。当此状态改变 collapsed () 或 expanded () 信号被发射带有相关项模型索引。

用于指示层次结构级别缩进量的控制通过 indentation 特性。

树视图 Header (头部) 的构造是使用 QHeaderView 类且可以被隐藏使用 header()->hide() 。注意，每个 Header (头部) 的配置采用其 stretchLastSection 特性被设为 true，确保视图不浪费为 Header (头部) 赋值的任何空间。若此值被设为 true，此特性将覆盖 Header (头部) 最后区间设置的重置大小模式。

默认情况下，树视图的所有列是可移动的，除第一列外。要禁用这些列的移动，使用 QHeaderView 's setSectionsMovable() 函数。有关重新排列区间的更多信息，见移动 Header (头部) 区间 .

键绑定

QTreeView 支持使用户能够在视图中导航并与项内容交互的一组键绑定：

Key	动作
Up	将光标移至上一行相同列项。若当前项父级没有更多行可导航，光标将移至父级之前最后同级行相关项。
Down	将光标移至下一行相同项列。若当前项父级没有更多行可导航，光标将移至紧随父级的第一同级行相关项。
Left	通过折叠分支，隐藏当前项的子级 (若存在)。
Minus	如同 Left。
Right	通过展开分支，展现当前项的子级 (若存在)。
Plus	如同 Right。
星号	展开当前项及其所有子级 (若存在)。
PageUp	上移光标一页。
PageDown	下移光标一页。
Home	将光标移至模型中第一顶层项第一行同一列项。
End	将光标移至模型中最后顶层项最后行同一列项。
F2	对于可编辑模型，这打开当前项以供编辑。Escape 键可以用于取消编辑过程，并恢复显示数据的任何改变。

改善性能

给出正处理数据的有关视图提示，以提高其性能是可能的，当显示大量项时。对于打算显示等高项的视图，可以接受的一种方式是设置 uniformRowHeights 特性为 true。

另请参阅 QListView , QTreeWidget , 视图类 , QAbstractItemModel , QAbstractItemView ，和目录视图范例 .

特性文档编制

allColumnsShowFocus : bool

此特性保持项是否应使用所有列展示键盘聚焦

若此特性为 true 所有列将展示焦点，否则仅一列将展示焦点。

默认为 false。

该特性在 Qt 4.2 引入。

访问函数：

bool	allColumnsShowFocus () const
void	setAllColumnsShowFocus (bool enable )

animated : bool

此特性保持是否启用动画

若此特性为 true 树视图将动画分支的扩展和折叠。若此特性为 false ，树视图将立即展开 (或折叠) 分支 (不展示动画)。

默认情况下，此特性为 false .

该特性在 Qt 4.2 引入。

访问函数：

bool	isAnimated () const
void	setAnimated (bool enable )

autoExpandDelay : int

此特性保持延迟时间，在拖放操作期间打开树项之前。

此特性保持以毫秒为单位的时间量，在该节点自动打开 (或关闭) 之前用户必须在节点上等待。若将时间设为小于 0，则不激活。

默认情况下，此特性拥有 -1 值，意味着禁用自动展开。

该特性在 Qt 4.3 引入。

访问函数：

int	autoExpandDelay () const
void	setAutoExpandDelay (int delay )

expandsOnDoubleClick : bool

此特性保持是否可以通过双击展开项。

此特性保持用户是否可以通过双击展开和折叠项。默认值为 true。

该特性在 Qt 4.4 引入。

访问函数：

bool	expandsOnDoubleClick () const
void	setExpandsOnDoubleClick (bool enable )

另请参阅 itemsExpandable .

headerHidden : bool

此特性保持是否展示 Header (头)。

若此特性为 true ，不展示 Header (头)，否则展示。默认值为 false。

该特性在 Qt 4.4 引入。

访问函数：

bool	isHeaderHidden () const
void	setHeaderHidden (bool hide )

另请参阅 header ().

indentation : int

树视图中项的缩进。

此特性保持树视图每级项的缩进度量 (以像素为单位)。对于顶层项，缩进指定从视口边缘到第一列项的水平距离；对于子级项，从父级项指定其缩进。

默认情况下，此特性的值从属样式。因此，当样式改变时，此特性随之更新。调用 setIndentation() 停止更新，调用 resetIndentation() 将还原默认行为。

访问函数：

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

itemsExpandable : bool

此特性保持项是否可以由用户展开。

此特性保持用户是否可以交互展开和折叠项。

默认情况下，此特性为 true .

访问函数：

bool	itemsExpandable () const
void	setItemsExpandable (bool enable )

rootIsDecorated : bool

此特性保持是否展示用于展开和折叠顶层项的控件

通常，采用控件展示具有子级的项的展开和折叠，允许展示 (或隐藏) 它们的子级。若此特性为 false，顶层项不展示这些控件。这可以用于使单级树结构，外观像简单项列表。

默认情况下，此特性为 true .

访问函数：

bool	rootIsDecorated () const
void	setRootIsDecorated (bool show )

sortingEnabled : bool

此特性保持是否启用排序

若此特性为 true ，树启用排序；若特性为 false，不启用排序。默认值为 false。

注意： 为避免性能问题，推荐启用排序 after 将项插入树中。另外，也可以将项插入列表，在将项插入树之前。

该特性在 Qt 4.2 引入。

访问函数：

bool	isSortingEnabled () const
void	setSortingEnabled (bool enable )

另请参阅 sortByColumn ().

uniformRowHeights : bool

此特性保持树视图中的所有项是否拥有相同高度

This property should only be set to true if it is guaranteed that all items in the view has the same height. This enables the view to do some optimizations.

The height is obtained from the first item in the view. It is updated when the data changes on that item.

注意： If the editor size hint is bigger than the cell size hint, then the size hint of the editor will be used.

默认情况下，此特性为 false .

访问函数：

bool	uniformRowHeights () const
void	setUniformRowHeights (bool uniform )

wordWrap : bool

此特性保持项文本的自动换行策略

若此特性为 true 那么有必要在单词分割处换行项文本；否则，根本不换行。此特性为 false 在默认情况下。

Note that even if wrapping is enabled, the cell will not be expanded to fit all text. Ellipsis will be inserted according to the current textElideMode .

该特性在 Qt 4.3 引入。

访问函数：

bool	wordWrap () const
void	setWordWrap (bool on )

成员函数文档编制

QTreeView:: QTreeView ( QWidget * parent = nullptr)

构造树视图采用 parent 来表示模型数据。使用 setModel () 来设置模型。

另请参阅 QAbstractItemModel .

`[slot]` void QTreeView:: collapse (const QModelIndex & index )

折叠的模型项指定通过 index .

另请参阅 collapsed ().

`[slot]` void QTreeView:: collapseAll ()

折叠所有展开项。

该函数在 Qt 4.2 引入。

另请参阅 expandAll (), expand (), collapse ()，和 setExpanded ().

`[signal]` void QTreeView:: collapsed (const QModelIndex & index )

此信号被发射当项指定通过 index is collapsed.

`[protected slot]` void QTreeView:: columnCountChanged ( int oldCount , int newCount )

Informs the tree view that the number of columns in the tree view has changed from oldCount to newCount .

`[protected slot]` void QTreeView:: columnMoved ()

This slot is called whenever a column has been moved.

`[protected slot]` void QTreeView:: columnResized ( int column , int oldSize , int newSize )

This function is called whenever column 's size is changed in the header. oldSize and newSize give the previous size and the new size in pixels.

另请参阅 setColumnWidth ().

`[slot]` void QTreeView:: expand (const QModelIndex & index )

Expands the model item specified by the index .

另请参阅 expanded ().

`[slot]` void QTreeView:: expandAll ()

展开所有可展开项。

注意： This function will not try to fetch more data.

警告： If the model contains a large number of items, this function will take some time to execute.

该函数在 Qt 4.2 引入。

另请参阅 collapseAll (), expand (), collapse ()，和 setExpanded ().

`[slot]` void QTreeView:: expandRecursively (const QModelIndex & index , int depth = -1)

Expands the item at the given index and all its children to the given depth 。 depth is relative to the given index 。 depth of -1 will expand all children, a depth of 0 will only expand the given index .

注意： This function will not try to fetch more data.

警告： If the model contains a large number of items, this function will take some time to execute.

该函数在 Qt 5.13 引入。

另请参阅 expandAll ().

`[slot]` void QTreeView:: expandToDepth ( int depth )

展开所有可展开项到给定 depth .

注意： This function will not try to fetch more data.

该函数在 Qt 4.3 引入。

另请参阅 expandAll (), collapseAll (), expand (), collapse ()，和 setExpanded ().

`[signal]` void QTreeView:: expanded (const QModelIndex & index )

此信号被发射当项指定通过 index is expanded.

另请参阅 setExpanded ().

`[slot]` void QTreeView:: hideColumn ( int column )

隐藏 column 给定。

注意： This function should only be called after the model has been initialized, as the view needs to know the number of columns in order to hide column .

另请参阅 showColumn () 和 setColumnHidden ().

`[slot]` void QTreeView:: resizeColumnToContents ( int column )

重置大小 column given to the size of its contents.

另请参阅 columnWidth (), setColumnWidth (), sizeHintForColumn ()，和 QHeaderView::resizeContentsPrecision ().

`[protected slot]` void QTreeView:: rowsRemoved (const QModelIndex & parent , int start , int end )

Informs the view that the rows from the start row to the end row inclusive have been removed from the given parent model item.

该函数在 Qt 4.1 引入。

`[slot]` void QTreeView:: showColumn ( int column )

展示给定 column 在树视图。

另请参阅 hideColumn () 和 setColumnHidden ().

`[slot]` void QTreeView:: sortByColumn ( int column , Qt::SortOrder order )

Sorts the model by the values in the given column and order .

column may be -1, in which case no sort indicator will be shown and the model will return to its natural, unsorted order. Note that not all models support this and may even crash in this case.

该函数在 Qt 4.2 引入。

另请参阅 sortingEnabled .

`[虚拟]` QTreeView:: ~QTreeView ()

销毁树视图。

int QTreeView:: columnAt ( int x ) const

Returns the column in the tree view whose header covers the x coordinate given.

int QTreeView:: columnViewportPosition ( int column ) const

Returns the horizontal position of the column in the viewport.

int QTreeView:: columnWidth ( int column ) const

返回宽度为 column .

另请参阅 resizeColumnToContents () 和 setColumnWidth ().

`[override virtual protected]` void QTreeView:: currentChanged (const QModelIndex & current , const QModelIndex & 上一 )

重实现： QAbstractItemView::currentChanged (const QModelIndex ¤t, const QModelIndex &previous).

`[override virtual]` void QTreeView:: dataChanged (const QModelIndex & topLeft , const QModelIndex & bottomRight , const QVector < int > & roles = QVector<int>())

重实现： QAbstractItemView::dataChanged (const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles).

`[override virtual protected]` void QTreeView:: dragMoveEvent ( QDragMoveEvent * event )

重实现： QAbstractItemView::dragMoveEvent (QDragMoveEvent *event).

`[virtual protected]` void QTreeView:: drawBranches ( QPainter * painter , const QRect & rect , const QModelIndex & index ) const

Draws the branches in the tree view on the same row as the model item index ，使用 painter given. The branches are drawn in the rectangle specified by rect .

`[virtual protected]` void QTreeView:: drawRow ( QPainter * painter , const QStyleOptionViewItem & option , const QModelIndex & index ) const

Draws the row in the tree view that contains the model item index ，使用 painter given. The option controls how the item is displayed.

另请参阅 setAlternatingRowColors ().

`[protected]` void QTreeView:: drawTree ( QPainter * painter , const QRegion & region ) const

Draws the part of the tree intersecting the given region 使用指定 painter .

该函数在 Qt 4.2 引入。

另请参阅 paintEvent ().

返回用于树视图的 Header (头)。

另请参阅 setHeader () 和 QAbstractItemModel::headerData ().

`[override virtual protected]` int QTreeView:: horizontalOffset () const

重实现： QAbstractItemView::horizontalOffset () const.

Returns the horizontal offset of the items in the treeview.

Note that the tree view uses the horizontal header section positions to determine the positions of columns in the view.

另请参阅 verticalOffset ().

QModelIndex QTreeView:: indexAbove (const QModelIndex & index ) const

Returns the model index of the item above index .

`[override virtual]` QModelIndex QTreeView:: indexAt (const QPoint & point ) const

重实现： QAbstractItemView::indexAt (const QPoint &point) const.

QModelIndex QTreeView:: indexBelow (const QModelIndex & index ) const

Returns the model index of the item below index .

`[protected]` int QTreeView:: indexRowSizeHint (const QModelIndex & index ) const

Returns the size hint for the row indicated by index .

另请参阅 sizeHintForColumn () 和 uniformRowHeights ().

bool QTreeView:: isColumnHidden ( int column ) const

返回 true 若 column 被隐藏；否则返回 false .

另请参阅 hideColumn () 和 isRowHidden ().

bool QTreeView:: isExpanded (const QModelIndex & index ) const

返回 true 若模型项 index 被展开；否则返回 false。

另请参阅 expand (), expanded ()，和 setExpanded ().

bool QTreeView:: isFirstColumnSpanned ( int row , const QModelIndex & parent ) const

返回 true 若第一列中的项在给定 row 的 parent 跨越所有列；否则返回 false .

该函数在 Qt 4.3 引入。

另请参阅 setFirstColumnSpanned ().

`[override virtual protected]` bool QTreeView:: isIndexHidden (const QModelIndex & index ) const

重实现： QAbstractItemView::isIndexHidden (const QModelIndex &index) const.

bool QTreeView:: isRowHidden ( int row , const QModelIndex & parent ) const

返回 true 若项在给定 row 的 parent 被隐藏；否则返回 false .

另请参阅 setRowHidden () 和 isColumnHidden ().

`[override virtual protected]` void QTreeView:: keyPressEvent ( QKeyEvent * event )

重实现： QAbstractItemView::keyPressEvent (QKeyEvent *event).

`[override virtual]` void QTreeView:: keyboardSearch (const QString & search )

重实现： QAbstractItemView::keyboardSearch (const QString &search).

`[override virtual protected]` void QTreeView:: mouseDoubleClickEvent ( QMouseEvent * event )

重实现： QAbstractItemView::mouseDoubleClickEvent (QMouseEvent *event).

`[override virtual protected]` void QTreeView:: mouseMoveEvent ( QMouseEvent * event )

重实现： QAbstractItemView::mouseMoveEvent (QMouseEvent *event).

`[override virtual protected]` void QTreeView:: mousePressEvent ( QMouseEvent * event )

重实现： QAbstractItemView::mousePressEvent (QMouseEvent *event).

`[override virtual protected]` void QTreeView:: mouseReleaseEvent ( QMouseEvent * event )

重实现： QAbstractItemView::mouseReleaseEvent (QMouseEvent *event).

`[override virtual protected]` QModelIndex QTreeView:: moveCursor ( QAbstractItemView::CursorAction cursorAction , Qt::KeyboardModifiers modifiers )

重实现： QAbstractItemView::moveCursor (QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers).

Move the cursor in the way described by cursorAction , using the information provided by the button modifiers .

`[override virtual protected]` void QTreeView:: paintEvent ( QPaintEvent * event )

重实现： QAbstractScrollArea::paintEvent (QPaintEvent *event).

`[override virtual]` void QTreeView:: reset ()

重实现： QAbstractItemView::reset ().

`[protected]` int QTreeView:: rowHeight (const QModelIndex & index ) const

返回指示行的高度通过给定 index .

该函数在 Qt 4.3 引入。

另请参阅 indexRowSizeHint ().

`[override virtual protected]` void QTreeView:: rowsAboutToBeRemoved (const QModelIndex & parent , int start , int end )

重实现： QAbstractItemView::rowsAboutToBeRemoved (const QModelIndex &parent, int start, int end).

Informs the view that the rows from the start row to the end row inclusive are about to removed from the given parent model item.

`[override virtual protected]` void QTreeView:: rowsInserted (const QModelIndex & parent , int start , int end )

重实现： QAbstractItemView::rowsInserted (const QModelIndex &parent, int start, int end).

Informs the view that the rows from the start row to the end row inclusive have been inserted into the parent model item.

`[override virtual protected]` void QTreeView:: scrollContentsBy ( int dx , int dy )

重实现： QAbstractScrollArea::scrollContentsBy (int dx, int dy).

卷动树视图内容通过 ( dx , dy ).

`[override virtual]` void QTreeView:: scrollTo (const QModelIndex & index , QAbstractItemView::ScrollHint hint = EnsureVisible)

重实现： QAbstractItemView::scrollTo (const QModelIndex &index, QAbstractItemView::ScrollHint hint).

Scroll the contents of the tree view until the given model item index 可见。 hint parameter specifies more precisely where the item should be located after the operation. If any of the parents of the model item are collapsed, they will be expanded to ensure that the model item is visible.

`[override virtual]` void QTreeView:: selectAll ()

重实现： QAbstractItemView::selectAll ().

`[override virtual protected]` QModelIndexList QTreeView:: selectedIndexes () const

重实现： QAbstractItemView::selectedIndexes () const.

`[override virtual protected]` void QTreeView:: selectionChanged (const QItemSelection & selected , const QItemSelection & deselected )

重实现： QAbstractItemView::selectionChanged (const QItemSelection &selected, const QItemSelection &deselected).

void QTreeView:: setColumnHidden ( int column , bool hide )

若 hide 为 true column 被隐藏，否则 column 被展示。

另请参阅 isColumnHidden (), hideColumn ()，和 setRowHidden ().

void QTreeView:: setColumnWidth ( int column , int width )

设置宽度为给定 column 到 width 指定。

该函数在 Qt 4.2 引入。

另请参阅 columnWidth () 和 resizeColumnToContents ().

void QTreeView:: setExpanded (const QModelIndex & index , bool expanded )

Sets the item referred to by index to either collapse or expanded, depending on the value of expanded .

另请参阅 expanded (), expand ()，和 isExpanded ().

void QTreeView:: setFirstColumnSpanned ( int row , const QModelIndex & parent , bool span )

若 span is true the item in the first column in the row 采用给定 parent is set to span all columns, otherwise all items on the row are shown.

该函数在 Qt 4.3 引入。

另请参阅 isFirstColumnSpanned ().

void QTreeView:: setHeader ( QHeaderView * header )

Sets the header for the tree view, to the given header .

The view takes ownership over the given header and deletes it when a new header is set.

另请参阅 QAbstractItemModel::headerData ().

`[override virtual]` void QTreeView:: setModel ( QAbstractItemModel * model )

重实现： QAbstractItemView::setModel (QAbstractItemModel *model).

`[override virtual]` void QTreeView:: setRootIndex (const QModelIndex & index )

重实现： QAbstractItemView::setRootIndex (const QModelIndex &index).

void QTreeView:: setRowHidden ( int row , const QModelIndex & parent , bool hide )

若 hide 为 true row 采用给定 parent 被隐藏，否则 row 被展示。

另请参阅 isRowHidden () 和 setColumnHidden ().

`[override virtual protected]` void QTreeView:: setSelection (const QRect & rect , QItemSelectionModel::SelectionFlags 命令 )

重实现： QAbstractItemView::setSelection (const QRect &rect, QItemSelectionModel::SelectionFlags flags).

应用选定命令到矩形内项，或触及的通过矩形 rect .

另请参阅 selectionCommand ().

`[override virtual]` void QTreeView:: setSelectionModel ( QItemSelectionModel * selectionModel )

重实现： QAbstractItemView::setSelectionModel (QItemSelectionModel *selectionModel).

void QTreeView:: setTreePosition ( int index )

这指定树结构应放置在逻辑索引 index 。若设为 -1 则树始终紧跟视觉索引 0。

该函数在 Qt 5.2 引入。

另请参阅 treePosition (), QHeaderView::swapSections ()，和 QHeaderView::moveSection ().

`[override virtual protected]` int QTreeView:: sizeHintForColumn ( int column ) const

重实现： QAbstractItemView::sizeHintForColumn (int column) const.

返回大小提示为 column 的宽度或 -1 若没有模型。

若需要将给定列宽度设为固定值，调用 QHeaderView::resizeSection () 在视图的 Header (头部)。

If you reimplement this function in a subclass, note that the value you return is only used when resizeColumnToContents () is called. In that case, if a larger column width is required by either the view's header or the item delegate, that width will be used instead.

另请参阅 QWidget::sizeHint , header ()，和 QHeaderView::resizeContentsPrecision ().

`[override virtual protected]` void QTreeView:: timerEvent ( QTimerEvent * event )

重实现： QAbstractItemView::timerEvent (QTimerEvent *event).

int QTreeView:: treePosition () const

Return the logical index the tree is set on. If the return value is -1 then the tree is placed on the visual index 0.

该函数在 Qt 5.2 引入。

另请参阅 setTreePosition ().

`[override virtual protected]` void QTreeView:: updateGeometries ()

重实现： QAbstractItemView::updateGeometries ().

`[override virtual protected]` int QTreeView:: verticalOffset () const

重实现： QAbstractItemView::verticalOffset () const.

返回树视图中项的垂直偏移。

另请参阅 horizontalOffset ().

`[override virtual protected]` bool QTreeView:: viewportEvent ( QEvent * event )

重实现： QAbstractItemView::viewportEvent (QEvent *event).

`[override virtual protected]` QSize QTreeView:: viewportSizeHint () const

重实现： QAbstractItemView::viewportSizeHint () const.

`[override virtual]` QRect QTreeView:: visualRect (const QModelIndex & index ) const

重实现： QAbstractItemView::visualRect (const QModelIndex &index) const.

返回项所占据的视口矩形为 index 。若索引不可见或被明确隐藏，返回矩形无效。

`[override virtual protected]` QRegion QTreeView:: visualRegionForSelection (const QItemSelection & selection ) const

重实现： QAbstractItemView::visualRegionForSelection (const QItemSelection &selection) const.

返回矩形从项视口在给定 selection .

从 4.7 起，返回区域仅包含 (或包括在) 视口相交矩形。

QTreeView 类

特性

公共函数

重实现公共函数

公共槽

信号

保护函数

重实现保护函数

保护槽

详细描述

键绑定

改善性能

特性文档编制

allColumnsShowFocus : bool

animated : bool

autoExpandDelay : int

expandsOnDoubleClick : bool

headerHidden : bool

indentation : int

itemsExpandable : bool

rootIsDecorated : bool

sortingEnabled : bool

uniformRowHeights : bool

wordWrap : bool

成员函数文档编制

QTreeView:: QTreeView ( QWidget * parent = nullptr)

[slot] void QTreeView:: collapse (const QModelIndex & index )

[slot] void QTreeView:: collapseAll ()

[signal] void QTreeView:: collapsed (const QModelIndex & index )

[protected slot] void QTreeView:: columnCountChanged ( int oldCount , int newCount )

[protected slot] void QTreeView:: columnMoved ()

[protected slot] void QTreeView:: columnResized ( int column , int oldSize , int newSize )

[slot] void QTreeView:: expand (const QModelIndex & index )

[slot] void QTreeView:: expandAll ()

[slot] void QTreeView:: expandRecursively (const QModelIndex & index , int depth = -1)

[slot] void QTreeView:: expandToDepth ( int depth )

[signal] void QTreeView:: expanded (const QModelIndex & index )

[slot] void QTreeView:: hideColumn ( int column )

[slot] void QTreeView:: resizeColumnToContents ( int column )

[protected slot] void QTreeView:: rowsRemoved (const QModelIndex & parent , int start , int end )

[slot] void QTreeView:: showColumn ( int column )

[slot] void QTreeView:: sortByColumn ( int column , Qt::SortOrder order )

[虚拟] QTreeView:: ~QTreeView ()

int QTreeView:: columnAt ( int x ) const

int QTreeView:: columnViewportPosition ( int column ) const

int QTreeView:: columnWidth ( int column ) const

[override virtual protected] void QTreeView:: currentChanged (const QModelIndex & current , const QModelIndex & 上一 )

[override virtual] void QTreeView:: dataChanged (const QModelIndex & topLeft , const QModelIndex & bottomRight , const QVector < int > & roles = QVector<int>())

[override virtual protected] void QTreeView:: dragMoveEvent ( QDragMoveEvent * event )

[virtual protected] void QTreeView:: drawBranches ( QPainter * painter , const QRect & rect , const QModelIndex & index ) const

[virtual protected] void QTreeView:: drawRow ( QPainter * painter , const QStyleOptionViewItem & option , const QModelIndex & index ) const

[protected] void QTreeView:: drawTree ( QPainter * painter , const QRegion & region ) const

QHeaderView *QTreeView:: header () const

[override virtual protected] int QTreeView:: horizontalOffset () const

QModelIndex QTreeView:: indexAbove (const QModelIndex & index ) const

[override virtual] QModelIndex QTreeView:: indexAt (const QPoint & point ) const

QModelIndex QTreeView:: indexBelow (const QModelIndex & index ) const

[protected] int QTreeView:: indexRowSizeHint (const QModelIndex & index ) const

bool QTreeView:: isColumnHidden ( int column ) const

bool QTreeView:: isExpanded (const QModelIndex & index ) const

bool QTreeView:: isFirstColumnSpanned ( int row , const QModelIndex & parent ) const

[override virtual protected] bool QTreeView:: isIndexHidden (const QModelIndex & index ) const

bool QTreeView:: isRowHidden ( int row , const QModelIndex & parent ) const

[override virtual protected] void QTreeView:: keyPressEvent ( QKeyEvent * event )

[override virtual] void QTreeView:: keyboardSearch (const QString & search )

[override virtual protected] void QTreeView:: mouseDoubleClickEvent ( QMouseEvent * event )

[override virtual protected] void QTreeView:: mouseMoveEvent ( QMouseEvent * event )

[override virtual protected] void QTreeView:: mousePressEvent ( QMouseEvent * event )

[override virtual protected] void QTreeView:: mouseReleaseEvent ( QMouseEvent * event )

[override virtual protected] QModelIndex QTreeView:: moveCursor ( QAbstractItemView::CursorAction cursorAction , Qt::KeyboardModifiers modifiers )

[override virtual protected] void QTreeView:: paintEvent ( QPaintEvent * event )

[override virtual] void QTreeView:: reset ()

[protected] int QTreeView:: rowHeight (const QModelIndex & index ) const

[override virtual protected] void QTreeView:: rowsAboutToBeRemoved (const QModelIndex & parent , int start , int end )

[override virtual protected] void QTreeView:: rowsInserted (const QModelIndex & parent , int start , int end )

[override virtual protected] void QTreeView:: scrollContentsBy ( int dx , int dy )

[override virtual] void QTreeView:: scrollTo (const QModelIndex & index , QAbstractItemView::ScrollHint hint = EnsureVisible)

[override virtual] void QTreeView:: selectAll ()

[override virtual protected] QModelIndexList QTreeView:: selectedIndexes () const

[override virtual protected] void QTreeView:: selectionChanged (const QItemSelection & selected , const QItemSelection & deselected )

`[slot]` void QTreeView:: collapse (const QModelIndex & index )

`[slot]` void QTreeView:: collapseAll ()

`[signal]` void QTreeView:: collapsed (const QModelIndex & index )

`[protected slot]` void QTreeView:: columnCountChanged ( int oldCount , int newCount )

`[protected slot]` void QTreeView:: columnMoved ()

`[protected slot]` void QTreeView:: columnResized ( int column , int oldSize , int newSize )

`[slot]` void QTreeView:: expand (const QModelIndex & index )

`[slot]` void QTreeView:: expandAll ()

`[slot]` void QTreeView:: expandRecursively (const QModelIndex & index , int depth = -1)

`[slot]` void QTreeView:: expandToDepth ( int depth )

`[signal]` void QTreeView:: expanded (const QModelIndex & index )

`[slot]` void QTreeView:: hideColumn ( int column )

`[slot]` void QTreeView:: resizeColumnToContents ( int column )

`[protected slot]` void QTreeView:: rowsRemoved (const QModelIndex & parent , int start , int end )

`[slot]` void QTreeView:: showColumn ( int column )

`[slot]` void QTreeView:: sortByColumn ( int column , Qt::SortOrder order )

`[虚拟]` QTreeView:: ~QTreeView ()

`[override virtual protected]` void QTreeView:: currentChanged (const QModelIndex & current , const QModelIndex & 上一 )

`[override virtual]` void QTreeView:: dataChanged (const QModelIndex & topLeft , const QModelIndex & bottomRight , const QVector < int > & roles = QVector<int>())

`[override virtual protected]` void QTreeView:: dragMoveEvent ( QDragMoveEvent * event )

`[virtual protected]` void QTreeView:: drawBranches ( QPainter * painter , const QRect & rect , const QModelIndex & index ) const

`[virtual protected]` void QTreeView:: drawRow ( QPainter * painter , const QStyleOptionViewItem & option , const QModelIndex & index ) const

`[protected]` void QTreeView:: drawTree ( QPainter * painter , const QRegion & region ) const

`[override virtual protected]` int QTreeView:: horizontalOffset () const

`[override virtual]` QModelIndex QTreeView:: indexAt (const QPoint & point ) const

`[protected]` int QTreeView:: indexRowSizeHint (const QModelIndex & index ) const

`[override virtual protected]` bool QTreeView:: isIndexHidden (const QModelIndex & index ) const

`[override virtual protected]` void QTreeView:: keyPressEvent ( QKeyEvent * event )

`[override virtual]` void QTreeView:: keyboardSearch (const QString & search )

`[override virtual protected]` void QTreeView:: mouseDoubleClickEvent ( QMouseEvent * event )

`[override virtual protected]` void QTreeView:: mouseMoveEvent ( QMouseEvent * event )

`[override virtual protected]` void QTreeView:: mousePressEvent ( QMouseEvent * event )

`[override virtual protected]` void QTreeView:: mouseReleaseEvent ( QMouseEvent * event )

`[override virtual protected]` QModelIndex QTreeView:: moveCursor ( QAbstractItemView::CursorAction cursorAction , Qt::KeyboardModifiers modifiers )

`[override virtual protected]` void QTreeView:: paintEvent ( QPaintEvent * event )

`[override virtual]` void QTreeView:: reset ()

`[protected]` int QTreeView:: rowHeight (const QModelIndex & index ) const

`[override virtual protected]` void QTreeView:: rowsAboutToBeRemoved (const QModelIndex & parent , int start , int end )

`[override virtual protected]` void QTreeView:: rowsInserted (const QModelIndex & parent , int start , int end )

`[override virtual protected]` void QTreeView:: scrollContentsBy ( int dx , int dy )

`[override virtual]` void QTreeView:: scrollTo (const QModelIndex & index , QAbstractItemView::ScrollHint hint = EnsureVisible)

`[override virtual]` void QTreeView:: selectAll ()

`[override virtual protected]` QModelIndexList QTreeView:: selectedIndexes () const

`[override virtual protected]` void QTreeView:: selectionChanged (const QItemSelection & selected , const QItemSelection & deselected )

`[override virtual]` void QTreeView:: setModel ( QAbstractItemModel * model )

`[override virtual]` void QTreeView:: setRootIndex (const QModelIndex & index )

`[override virtual protected]` void QTreeView:: setSelection (const QRect & rect , QItemSelectionModel::SelectionFlags 命令 )

`[override virtual]` void QTreeView:: setSelectionModel ( QItemSelectionModel * selectionModel )

`[override virtual protected]` int QTreeView:: sizeHintForColumn ( int column ) const

`[override virtual protected]` void QTreeView:: timerEvent ( QTimerEvent * event )

`[override virtual protected]` void QTreeView:: updateGeometries ()

`[override virtual protected]` int QTreeView:: verticalOffset () const

`[override virtual protected]` bool QTreeView:: viewportEvent ( QEvent * event )

`[override virtual protected]` QSize QTreeView:: viewportSizeHint () const

`[override virtual]` QRect QTreeView:: visualRect (const QModelIndex & index ) const

`[override virtual protected]` QRegion QTreeView:: visualRegionForSelection (const QItemSelection & selection ) const