QAbstractItemView Class

The QAbstractItemView class provides the basic functionality for item view classes. More...

Header:	#include <QAbstractItemView>
qmake:	QT += widgets
Inherits:	QAbstractScrollArea
Inherited By:	QColumnView, QHeaderView, QListView, QTableView, and QTreeView

• List of all members, including inherited members
• Obsolete members

Public Types

enum	DragDropMode { NoDragDrop, DragOnly, DropOnly, DragDrop, InternalMove }
enum	EditTrigger { NoEditTriggers, CurrentChanged, DoubleClicked, SelectedClicked, EditKeyPressed, …, AllEditTriggers }
flags	EditTriggers
enum	ScrollHint { EnsureVisible, PositionAtTop, PositionAtBottom, PositionAtCenter }
enum	ScrollMode { ScrollPerItem, ScrollPerPixel }
enum	SelectionBehavior { SelectItems, SelectRows, SelectColumns }
enum	SelectionMode { SingleSelection, ContiguousSelection, ExtendedSelection, MultiSelection, NoSelection }

Properties

alternatingRowColors : bool autoScroll : bool autoScrollMargin : int defaultDropAction : Qt::DropAction dragDropMode : DragDropMode dragDropOverwriteMode : bool dragEnabled : bool editTriggers : EditTriggers

horizontalScrollMode : ScrollMode iconSize : QSize selectionBehavior : SelectionBehavior selectionMode : SelectionMode showDropIndicator : bool tabKeyNavigation : bool textElideMode : Qt::TextElideMode verticalScrollMode : ScrollMode

Public Functions

	QAbstractItemView(QWidget *parent = nullptr)
virtual	~QAbstractItemView()
bool	alternatingRowColors() const
int	autoScrollMargin() const
void	closePersistentEditor(const QModelIndex &index)
QModelIndex	currentIndex() const
Qt::DropAction	defaultDropAction() const
QAbstractItemView::DragDropMode	dragDropMode() const
bool	dragDropOverwriteMode() const
bool	dragEnabled() const
QAbstractItemView::EditTriggers	editTriggers() const
bool	hasAutoScroll() const
QAbstractItemView::ScrollMode	horizontalScrollMode() const
QSize	iconSize() const
virtual QModelIndex	indexAt(const QPoint &point) const = 0
QWidget *	indexWidget(const QModelIndex &index) const
bool	isPersistentEditorOpen(const QModelIndex &index) const
QAbstractItemDelegate *	itemDelegate() const
QAbstractItemDelegate *	itemDelegate(const QModelIndex &index) const
QAbstractItemDelegate *	itemDelegateForColumn(int column) const
QAbstractItemDelegate *	itemDelegateForRow(int row) const
virtual void	keyboardSearch(const QString &search)
QAbstractItemModel *	model() const
void	openPersistentEditor(const QModelIndex &index)
void	resetHorizontalScrollMode()
void	resetVerticalScrollMode()
QModelIndex	rootIndex() const
virtual void	scrollTo(const QModelIndex &index, QAbstractItemView::ScrollHint hint = EnsureVisible) = 0
QAbstractItemView::SelectionBehavior	selectionBehavior() const
QAbstractItemView::SelectionMode	selectionMode() const
QItemSelectionModel *	selectionModel() const
void	setAlternatingRowColors(bool enable)
void	setAutoScroll(bool enable)
void	setAutoScrollMargin(int margin)
void	setDefaultDropAction(Qt::DropAction dropAction)
void	setDragDropMode(QAbstractItemView::DragDropMode behavior)
void	setDragDropOverwriteMode(bool overwrite)
void	setDragEnabled(bool enable)
void	setDropIndicatorShown(bool enable)
void	setEditTriggers(QAbstractItemView::EditTriggers triggers)
void	setHorizontalScrollMode(QAbstractItemView::ScrollMode mode)
void	setIconSize(const QSize &size)
void	setIndexWidget(const QModelIndex &index, QWidget *widget)
void	setItemDelegate(QAbstractItemDelegate *delegate)
void	setItemDelegateForColumn(int column, QAbstractItemDelegate *delegate)
void	setItemDelegateForRow(int row, QAbstractItemDelegate *delegate)
virtual void	setModel(QAbstractItemModel *model)
void	setSelectionBehavior(QAbstractItemView::SelectionBehavior behavior)
void	setSelectionMode(QAbstractItemView::SelectionMode mode)
virtual void	setSelectionModel(QItemSelectionModel *selectionModel)
void	setTabKeyNavigation(bool enable)
void	setTextElideMode(Qt::TextElideMode mode)
void	setVerticalScrollMode(QAbstractItemView::ScrollMode mode)
bool	showDropIndicator() const
virtual int	sizeHintForColumn(int column) const
QSize	sizeHintForIndex(const QModelIndex &index) const
virtual int	sizeHintForRow(int row) const
bool	tabKeyNavigation() const
Qt::TextElideMode	textElideMode() const
QAbstractItemView::ScrollMode	verticalScrollMode() const
virtual QRect	visualRect(const QModelIndex &index) const = 0

Reimplemented Public Functions

virtual QVariant

inputMethodQuery(Qt::InputMethodQuery query) const override

Public Slots

void	clearSelection()
void	edit(const QModelIndex &index)
virtual void	reset()
void	scrollToBottom()
void	scrollToTop()
virtual void	selectAll()
void	setCurrentIndex(const QModelIndex &index)
virtual void	setRootIndex(const QModelIndex &index)
void	update(const QModelIndex &index)

Signals

void	activated(const QModelIndex &index)
void	clicked(const QModelIndex &index)
void	doubleClicked(const QModelIndex &index)
void	entered(const QModelIndex &index)
void	iconSizeChanged(const QSize &size)
void	pressed(const QModelIndex &index)
void	viewportEntered()

Protected Types

enum	CursorAction { MoveUp, MoveDown, MoveLeft, MoveRight, MoveHome, …, MovePrevious }
enum	DropIndicatorPosition { OnItem, AboveItem, BelowItem, OnViewport }
enum	State { NoState, DraggingState, DragSelectingState, EditingState, ExpandingState, …, AnimatingState }

Protected Functions

QPoint	dirtyRegionOffset() const
QAbstractItemView::DropIndicatorPosition	dropIndicatorPosition() const
virtual bool	edit(const QModelIndex &index, QAbstractItemView::EditTrigger trigger, QEvent *event)
void	executeDelayedItemsLayout()
virtual int	horizontalOffset() const = 0
virtual bool	isIndexHidden(const QModelIndex &index) const = 0
virtual QModelIndex	moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers modifiers) = 0
void	scheduleDelayedItemsLayout()
void	scrollDirtyRegion(int dx, int dy)
virtual QModelIndexList	selectedIndexes() const
virtual QItemSelectionModel::SelectionFlags	selectionCommand(const QModelIndex &index, const QEvent *event = nullptr) const
void	setDirtyRegion(const QRegion &region)
virtual void	setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags flags) = 0
void	setState(QAbstractItemView::State state)
virtual void	startDrag(Qt::DropActions supportedActions)
QAbstractItemView::State	state() const
virtual int	verticalOffset() const = 0
virtual QStyleOptionViewItem	viewOptions() const
virtual QRegion	visualRegionForSelection(const QItemSelection &selection) const = 0

Reimplemented Protected Functions

virtual void	dragEnterEvent(QDragEnterEvent *event) override
virtual void	dragLeaveEvent(QDragLeaveEvent *event) override
virtual void	dragMoveEvent(QDragMoveEvent *event) override
virtual void	dropEvent(QDropEvent *event) override
virtual bool	event(QEvent *event) override
virtual bool	eventFilter(QObject *object, QEvent *event) override
virtual void	focusInEvent(QFocusEvent *event) override
virtual bool	focusNextPrevChild(bool next) override
virtual void	focusOutEvent(QFocusEvent *event) override
virtual void	inputMethodEvent(QInputMethodEvent *event) 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 void	resizeEvent(QResizeEvent *event) override
virtual void	timerEvent(QTimerEvent *event) override
virtual bool	viewportEvent(QEvent *event) override
virtual QSize	viewportSizeHint() const override

Protected Slots

virtual void	closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint)
virtual void	commitData(QWidget *editor)
virtual void	currentChanged(const QModelIndex &current, const QModelIndex &previous)
virtual void	dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles = QVector<int>())
virtual void	editorDestroyed(QObject *editor)
virtual void	rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
virtual void	rowsInserted(const QModelIndex &parent, int start, int end)
virtual void	selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
virtual void	updateGeometries()

Detailed Description

QAbstractItemView class is the base class for every standard view that uses a QAbstractItemModel. QAbstractItemView is an abstract class and cannot itself be instantiated. It provides a standard interface for interoperating with models through the signals and slots mechanism, enabling subclasses to be kept up-to-date with changes to their models. This class provides standard support for keyboard and mouse navigation, viewport scrolling, item editing, and selections. The keyboard navigation implements this functionality:

Keys	Functionality
Arrow keys	Changes the current item and selects it.
Ctrl+Arrow keys	Changes the current item but does not select it.
Shift+Arrow keys	Changes the current item and selects it. The previously selected item(s) is not deselected.
Ctr+Space	Toggles selection of the current item.
Tab/Backtab	Changes the current item to the next/previous item.
Home/End	Selects the first/last item in the model.
Page up/Page down	Scrolls the rows shown up/down by the number of visible rows in the view.
Ctrl+A	Selects all items in the model.

Note that the above table assumes that the selection mode allows the operations. For instance, you cannot select items if the selection mode is QAbstractItemView::NoSelection.

The QAbstractItemView class is one of the Model/View Classes and is part of Qt's model/view framework.

The view classes that inherit QAbstractItemView only need to implement their own view-specific functionality, such as drawing items, returning the geometry of items, finding items, etc.

QAbstractItemView provides common slots such as edit() and setCurrentIndex(). Many protected slots are also provided, including dataChanged(), rowsInserted(), rowsAboutToBeRemoved(), selectionChanged(), and currentChanged().

The root item is returned by rootIndex(), and the current item by currentIndex(). To make sure that an item is visible use scrollTo().

Some of QAbstractItemView's functions are concerned with scrolling, for example setHorizontalScrollMode() and setVerticalScrollMode(). To set the range of the scroll bars, you can, for example, reimplement the view's resizeEvent() function:

void MyView::resizeEvent(QResizeEvent *event) {
    horizontalScrollBar()->setRange(0, realWidth - width());
    ...
}

Note that the range is not updated until the widget is shown.

Several other functions are concerned with selection control; for example setSelectionMode(), and setSelectionBehavior(). This class provides a default selection model to work with (selectionModel()), but this can be replaced by using setSelectionModel() with an instance of QItemSelectionModel.

For complete control over the display and editing of items you can specify a delegate with setItemDelegate().

QAbstractItemView provides a lot of protected functions. Some are concerned with editing, for example, edit(), and commitData(), whilst others are keyboard and mouse event handlers.

Note: If you inherit QAbstractItemView and intend to update the contents of the viewport, you should use viewport->update() instead of update() as all painting operations take place on the viewport.

See also View Classes, Model/View Programming, QAbstractItemModel, and Chart Example.

Member Type Documentation

enum QAbstractItemView::CursorAction

This enum describes the different ways to navigate between items,

Constant	Value	Description
QAbstractItemView::MoveUp	0	Move to the item above the current item.
QAbstractItemView::MoveDown	1	Move to the item below the current item.
QAbstractItemView::MoveLeft	2	Move to the item left of the current item.
QAbstractItemView::MoveRight	3	Move to the item right of the current item.
QAbstractItemView::MoveHome	4	Move to the top-left corner item.
QAbstractItemView::MoveEnd	5	Move to the bottom-right corner item.
QAbstractItemView::MovePageUp	6	Move one page up above the current item.
QAbstractItemView::MovePageDown	7	Move one page down below the current item.
QAbstractItemView::MoveNext	8	Move to the item after the current item.
QAbstractItemView::MovePrevious	9	Move to the item before the current item.

See also moveCursor().

enum QAbstractItemView::DragDropMode

Describes the various drag and drop events the view can act upon. By default the view does not support dragging or dropping (NoDragDrop).

Constant	Value	Description
QAbstractItemView::NoDragDrop	0	Does not support dragging or dropping.
QAbstractItemView::DragOnly	1	The view supports dragging of its own items
QAbstractItemView::DropOnly	2	The view accepts drops
QAbstractItemView::DragDrop	3	The view supports both dragging and dropping
QAbstractItemView::InternalMove	4	The view accepts move (not copy) operations only from itself.

Note that the model used needs to provide support for drag and drop operations.

This enum was introduced or modified in Qt 4.2.

See also setDragDropMode() and Using drag and drop with item views.

enum QAbstractItemView::DropIndicatorPosition

This enum indicates the position of the drop indicator in relation to the index at the current mouse position:

Constant	Value	Description
QAbstractItemView::OnItem	0	The item will be dropped on the index.
QAbstractItemView::AboveItem	1	The item will be dropped above the index.
QAbstractItemView::BelowItem	2	The item will be dropped below the index.
QAbstractItemView::OnViewport	3	The item will be dropped onto a region of the viewport with no items. The way each view handles items dropped onto the viewport depends on the behavior of the underlying model in use.

enum QAbstractItemView::EditTriggerflags QAbstractItemView::EditTriggers

This enum describes actions which will initiate item editing.

Constant	Value	Description
QAbstractItemView::NoEditTriggers	0	No editing possible.
QAbstractItemView::CurrentChanged	1	Editing start whenever current item changes.
QAbstractItemView::DoubleClicked	2	Editing starts when an item is double clicked.
QAbstractItemView::SelectedClicked	4	Editing starts when clicking on an already selected item.
QAbstractItemView::EditKeyPressed	8	Editing starts when the platform edit key has been pressed over an item.
QAbstractItemView::AnyKeyPressed	16	Editing starts when any key is pressed over an item.
QAbstractItemView::AllEditTriggers	31	Editing starts for all above actions.

The EditTriggers type is a typedef for QFlags<EditTrigger>. It stores an OR combination of EditTrigger values.

enum QAbstractItemView::ScrollHint

Constant	Value	Description
QAbstractItemView::EnsureVisible	0	Scroll to ensure that the item is visible.
QAbstractItemView::PositionAtTop	1	Scroll to position the item at the top of the viewport.
QAbstractItemView::PositionAtBottom	2	Scroll to position the item at the bottom of the viewport.
QAbstractItemView::PositionAtCenter	3	Scroll to position the item at the center of the viewport.

enum QAbstractItemView::ScrollMode

Describes how the scrollbar should behave. When setting the scroll mode to ScrollPerPixel the single step size will adjust automatically unless it was set explicitly using setSingleStep(). The automatic adjustment can be restored by setting the single step size to -1.

Constant	Value	Description
QAbstractItemView::ScrollPerItem	0	The view will scroll the contents one item at a time.
QAbstractItemView::ScrollPerPixel	1	The view will scroll the contents one pixel at a time.

This enum was introduced or modified in Qt 4.2.

enum QAbstractItemView::SelectionBehavior

Constant	Value	Description
QAbstractItemView::SelectItems	0	Selecting single items.
QAbstractItemView::SelectRows	1	Selecting only rows.
QAbstractItemView::SelectColumns	2	Selecting only columns.

enum QAbstractItemView::SelectionMode

This enum indicates how the view responds to user selections:

Constant	Value	Description
QAbstractItemView::SingleSelection	1	When the user selects an item, any already-selected item becomes unselected. It is possible for the user to deselect the selected item by pressing the Ctrl key when clicking the selected item.
QAbstractItemView::ContiguousSelection	4	When the user selects an item in the usual way, the selection is cleared and the new item selected. However, if the user presses the Shift key while clicking on an item, all items between the current item and the clicked item are selected or unselected, depending on the state of the clicked item.
QAbstractItemView::ExtendedSelection	3	When the user selects an item in the usual way, the selection is cleared and the new item selected. However, if the user presses the Ctrl key when clicking on an item, the clicked item gets toggled and all other items are left untouched. If the user presses the Shift key while clicking on an item, all items between the current item and the clicked item are selected or unselected, depending on the state of the clicked item. Multiple items can be selected by dragging the mouse over them.
QAbstractItemView::MultiSelection	2	When the user selects an item in the usual way, the selection status of that item is toggled and the other items are left alone. Multiple items can be toggled by dragging the mouse over them.
QAbstractItemView::NoSelection	0	Items cannot be selected.

The most commonly used modes are SingleSelection and ExtendedSelection.

enum QAbstractItemView::State

Describes the different states the view can be in. This is usually only interesting when reimplementing your own view.

Constant	Value	Description
QAbstractItemView::NoState	0	The is the default state.
QAbstractItemView::DraggingState	1	The user is dragging items.
QAbstractItemView::DragSelectingState	2	The user is selecting items.
QAbstractItemView::EditingState	3	The user is editing an item in a widget editor.
QAbstractItemView::ExpandingState	4	The user is opening a branch of items.
QAbstractItemView::CollapsingState	5	The user is closing a branch of items.
QAbstractItemView::AnimatingState	6	The item view is performing an animation.

Member Function Documentation

QAbstractItemView::QAbstractItemView(QWidget *parent = nullptr)

Constructs an abstract item view with the given parent.

[signal] void QAbstractItemView::activated(const QModelIndex &index)

This signal is emitted when the item specified by index is activated by the user. How to activate items depends on the platform; e.g., by single- or double-clicking the item, or by pressing the Return or Enter key when the item is current.

See also clicked(), doubleClicked(), entered(), and pressed().

[slot] void QAbstractItemView::clearSelection()

Deselects all selected items. The current index will not be changed.

See also setSelection() and selectAll().

[signal] void QAbstractItemView::clicked(const QModelIndex &index)

This signal is emitted when a mouse button is left-clicked. The item the mouse was clicked on is specified by index. The signal is only emitted when the index is valid.

See also activated(), doubleClicked(), entered(), and pressed().

[virtual protected slot] void QAbstractItemView::closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint)

Closes the given editor, and releases it. The hint is used to specify how the view should respond to the end of the editing operation. For example, the hint may indicate that the next item in the view should be opened for editing.

See also edit() and commitData().

[virtual protected slot] void QAbstractItemView::commitData(QWidget *editor)

Commit the data in the editor to the model.

See also closeEditor().

[virtual protected slot] void QAbstractItemView::currentChanged(const QModelIndex &current, const QModelIndex &previous)

This slot is called when a new item becomes the current item. The previous current item is specified by the previous index, and the new item by the current index.

If you want to know about changes to items see the dataChanged() signal.

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

This slot is called when items with the given roles are changed in the model. The changed items are those from topLeft to bottomRight inclusive. If just one item is changed topLeft == bottomRight.

The roles which have been changed can either be an empty container (meaning everything has changed), or a non-empty container with the subset of roles which have changed.

Note: : Qt::ToolTipRole is not honored by dataChanged() in the views provided by Qt.

[signal] void QAbstractItemView::doubleClicked(const QModelIndex &index)

This signal is emitted when a mouse button is double-clicked. The item the mouse was double-clicked on is specified by index. The signal is only emitted when the index is valid.

See also clicked() and activated().

[slot] void QAbstractItemView::edit(const QModelIndex &index)

Starts editing the item corresponding to the given index if it is editable.

Note that this function does not change the current index. Since the current index defines the next and previous items to edit, users may find that keyboard navigation does not work as expected. To provide consistent navigation behavior, call setCurrentIndex() before this function with the same model index.

See also QModelIndex::flags().

[virtual protected slot] void QAbstractItemView::editorDestroyed(QObject *editor)

This function is called when the given editor has been destroyed.

See also closeEditor().

[signal] void QAbstractItemView::entered(const QModelIndex &index)

This signal is emitted when the mouse cursor enters the item specified by index. Mouse tracking needs to be enabled for this feature to work.

See also viewportEntered(), activated(), clicked(), doubleClicked(), and pressed().

[signal] void QAbstractItemView::pressed(const QModelIndex &index)

This signal is emitted when a mouse button is pressed. The item the mouse was pressed on is specified by index. The signal is only emitted when the index is valid.

Use the QGuiApplication::mouseButtons() function to get the state of the mouse buttons.

See also activated(), clicked(), doubleClicked(), and entered().

[virtual slot] void QAbstractItemView::reset()

Reset the internal state of the view.

Warning: This function will reset open editors, scroll bar positions, selections, etc. Existing changes will not be committed. If you would like to save your changes when resetting the view, you can reimplement this function, commit your changes, and then call the superclass' implementation.

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

This slot is called when rows are about to be removed. The deleted rows are those under the given parent from start to end inclusive.

See also rowsInserted().

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

This slot is called when rows are inserted. The new rows are those under the given parent from start to end inclusive. The base class implementation calls fetchMore() on the model to check for more data.

See also rowsAboutToBeRemoved().

[slot] void QAbstractItemView::scrollToBottom()

Scrolls the view to the bottom.

This function was introduced in Qt 4.1.

See also scrollTo() and scrollToTop().

[slot] void QAbstractItemView::scrollToTop()

Scrolls the view to the top.

This function was introduced in Qt 4.1.

See also scrollTo() and scrollToBottom().

[virtual slot] void QAbstractItemView::selectAll()

Selects all items in the view. This function will use the selection behavior set on the view when selecting.

See also setSelection(), selectedIndexes(), and clearSelection().

[virtual protected slot] void QAbstractItemView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)

This slot is called when the selection is changed. The previous selection (which may be empty), is specified by deselected, and the new selection by selected.

See also setSelection().

[slot] void QAbstractItemView::setCurrentIndex(const QModelIndex &index)

Sets the current item to be the item at index.

Unless the current selection mode is NoSelection, the item is also selected. Note that this function also updates the starting position for any new selections the user performs.

To set an item as the current item without selecting it, call

selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);

See also currentIndex(), currentChanged(), and selectionMode.

[virtual slot] void QAbstractItemView::setRootIndex(const QModelIndex &index)

Sets the root item to the item at the given index.

See also rootIndex().

[slot] void QAbstractItemView::update(const QModelIndex &index)

Updates the area occupied by the given index.

This function was introduced in Qt 4.3.

[virtual protected slot] void QAbstractItemView::updateGeometries()

Updates the geometry of the child widgets of the view.

This function was introduced in Qt 4.4.

[signal] void QAbstractItemView::viewportEntered()

This signal is emitted when the mouse cursor enters the viewport. Mouse tracking needs to be enabled for this feature to work.

See also entered().

[virtual] QAbstractItemView::~QAbstractItemView()

Destroys the view.

void QAbstractItemView::closePersistentEditor(const QModelIndex &index)

Closes the persistent editor for the item at the given index.

See also openPersistentEditor() and isPersistentEditorOpen().

QModelIndex QAbstractItemView::currentIndex() const

Returns the model index of the current item.

See also setCurrentIndex().

[protected] QPoint QAbstractItemView::dirtyRegionOffset() const

Returns the offset of the dirty regions in the view.

If you use scrollDirtyRegion() and implement a paintEvent() in a subclass of QAbstractItemView, you should translate the area given by the paint event with the offset returned from this function.

See also scrollDirtyRegion() and setDirtyRegion().

[override virtual protected] void QAbstractItemView::dragEnterEvent(QDragEnterEvent *event)

Reimplements: QAbstractScrollArea::dragEnterEvent(QDragEnterEvent *event).

This function is called with the given event when a drag and drop operation enters the widget. If the drag is over a valid dropping place (e.g. over an item that accepts drops), the event is accepted; otherwise it is ignored.

See also dropEvent() and startDrag().

[override virtual protected] void QAbstractItemView::dragLeaveEvent(QDragLeaveEvent *event)

Reimplements: QAbstractScrollArea::dragLeaveEvent(QDragLeaveEvent *event).

This function is called when the item being dragged leaves the view. The event describes the state of the drag and drop operation.

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

Reimplements: QAbstractScrollArea::dragMoveEvent(QDragMoveEvent *event).

This function is called continuously with the given event during a drag and drop operation over the widget. It can cause the view to scroll if, for example, the user drags a selection to view's right or bottom edge. In this case, the event will be accepted; otherwise it will be ignored.

See also dropEvent() and startDrag().

[override virtual protected] void QAbstractItemView::dropEvent(QDropEvent *event)

Reimplements: QAbstractScrollArea::dropEvent(QDropEvent *event).

This function is called with the given event when a drop event occurs over the widget. If the model accepts the even position the drop event is accepted; otherwise it is ignored.

See also startDrag().

[protected] QAbstractItemView::DropIndicatorPosition QAbstractItemView::dropIndicatorPosition() const

Returns the position of the drop indicator in relation to the closest item.

This function was introduced in Qt 4.1.

[virtual protected] bool QAbstractItemView::edit(const QModelIndex &index, QAbstractItemView::EditTrigger trigger, QEvent *event)

Starts editing the item at index, creating an editor if necessary, and returns true if the view's State is now EditingState; otherwise returns false.

The action that caused the editing process is described by trigger, and the associated event is specified by event.

Editing can be forced by specifying the trigger to be QAbstractItemView::AllEditTriggers.

See also closeEditor().

[override virtual protected] bool QAbstractItemView::event(QEvent *event)

Reimplements: QAbstractScrollArea::event(QEvent *event).

[override virtual protected] bool QAbstractItemView::eventFilter(QObject *object, QEvent *event)

Reimplements: QObject::eventFilter(QObject *watched, QEvent *event).

[protected] void QAbstractItemView::executeDelayedItemsLayout()

Executes the scheduled layouts without waiting for the event processing to begin.

See also scheduleDelayedItemsLayout().

[override virtual protected] void QAbstractItemView::focusInEvent(QFocusEvent *event)

Reimplements: QWidget::focusInEvent(QFocusEvent *event).

This function is called with the given event when the widget obtains the focus. By default, the event is ignored.

See also setFocus() and focusOutEvent().

[override virtual protected] bool QAbstractItemView::focusNextPrevChild(bool next)

Reimplements: QWidget::focusNextPrevChild(bool next).

[override virtual protected] void QAbstractItemView::focusOutEvent(QFocusEvent *event)

Reimplements: QWidget::focusOutEvent(QFocusEvent *event).

This function is called with the given event when the widget loses the focus. By default, the event is ignored.

See also clearFocus() and focusInEvent().

[pure virtual protected] int QAbstractItemView::horizontalOffset() const

Returns the horizontal offset of the view.

In the base class this is a pure virtual function.

See also verticalOffset().

[pure virtual] QModelIndex QAbstractItemView::indexAt(const QPoint &point) const

Returns the model index of the item at the viewport coordinates point.

In the base class this is a pure virtual function.

See also visualRect().

QWidget *QAbstractItemView::indexWidget(const QModelIndex &index) const

Returns the widget for the item at the given index.

This function was introduced in Qt 4.1.

See also setIndexWidget().

[override virtual protected] void QAbstractItemView::inputMethodEvent(QInputMethodEvent *event)

Reimplements: QWidget::inputMethodEvent(QInputMethodEvent *event).

[override virtual] QVariant QAbstractItemView::inputMethodQuery(Qt::InputMethodQuery query) const

Reimplements: QWidget::inputMethodQuery(Qt::InputMethodQuery query) const.

[pure virtual protected] bool QAbstractItemView::isIndexHidden(const QModelIndex &index) const

Returns true if the item referred to by the given index is hidden in the view, otherwise returns false.

Hiding is a view specific feature. For example in TableView a column can be marked as hidden or a row in the TreeView.

In the base class this is a pure virtual function.

bool QAbstractItemView::isPersistentEditorOpen(const QModelIndex &index) const

Returns whether a persistent editor is open for the item at index index.

This function was introduced in Qt 5.10.

See also openPersistentEditor() and closePersistentEditor().

QAbstractItemDelegate *QAbstractItemView::itemDelegate() const

Returns the item delegate used by this view and model. This is either one set with setItemDelegate(), or the default one.

See also setItemDelegate().

QAbstractItemDelegate *QAbstractItemView::itemDelegate(const QModelIndex &index) const

Returns the item delegate used by this view and model for the given index.

QAbstractItemDelegate *QAbstractItemView::itemDelegateForColumn(int column) const

Returns the item delegate used by this view and model for the given column. You can call itemDelegate() to get a pointer to the current delegate for a given index.

This function was introduced in Qt 4.2.

See also setItemDelegateForColumn(), itemDelegateForRow(), and itemDelegate().

QAbstractItemDelegate *QAbstractItemView::itemDelegateForRow(int row) const

Returns the item delegate used by this view and model for the given row, or nullptr if no delegate has been assigned. You can call itemDelegate() to get a pointer to the current delegate for a given index.

This function was introduced in Qt 4.2.

See also setItemDelegateForRow(), itemDelegateForColumn(), and setItemDelegate().

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

Reimplements: QAbstractScrollArea::keyPressEvent(QKeyEvent *e).

This function is called with the given event when a key event is sent to the widget. The default implementation handles basic cursor movement, e.g. Up, Down, Left, Right, Home, PageUp, and PageDown; the activated() signal is emitted if the current index is valid and the activation key is pressed (e.g. Enter or Return, depending on the platform). This function is where editing is initiated by key press, e.g. if F2 is pressed.

See also edit(), moveCursor(), keyboardSearch(), and tabKeyNavigation.

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

Moves to and selects the item best matching the string search. If no item is found nothing happens.

In the default implementation, the search is reset if search is empty, or the time interval since the last search has exceeded QApplication::keyboardInputInterval().

QAbstractItemModel *QAbstractItemView::model() const

Returns the model that this view is presenting.

See also setModel().

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

Reimplements: QAbstractScrollArea::mouseDoubleClickEvent(QMouseEvent *e).

This function is called with the given event when a mouse button is double clicked inside the widget. If the double-click is on a valid item it emits the doubleClicked() signal and calls edit() on the item.

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

Reimplements: QAbstractScrollArea::mouseMoveEvent(QMouseEvent *e).

This function is called with the given event when a mouse move event is sent to the widget. If a selection is in progress and new items are moved over the selection is extended; if a drag is in progress it is continued.

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

Reimplements: QAbstractScrollArea::mousePressEvent(QMouseEvent *e).

This function is called with the given event when a mouse button is pressed while the cursor is inside the widget. If a valid item is pressed on it is made into the current item. This function emits the pressed() signal.

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

Reimplements: QAbstractScrollArea::mouseReleaseEvent(QMouseEvent *e).

This function is called with the given event when a mouse button is released, after a mouse press event on the widget. If a user presses the mouse inside your widget and then drags the mouse to another location before releasing the mouse button, your widget receives the release event. The function will emit the clicked() signal if an item was being pressed.

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

Returns a QModelIndex object pointing to the next object in the view, based on the given cursorAction and keyboard modifiers specified by modifiers.

In the base class this is a pure virtual function.

void QAbstractItemView::openPersistentEditor(const QModelIndex &index)

Opens a persistent editor on the item at the given index. If no editor exists, the delegate will create a new editor.

See also closePersistentEditor() and isPersistentEditorOpen().

[override virtual protected] void QAbstractItemView::resizeEvent(QResizeEvent *event)

Reimplements: QAbstractScrollArea::resizeEvent(QResizeEvent *event).

This function is called with the given event when a resize event is sent to the widget.

See also QWidget::resizeEvent().

QModelIndex QAbstractItemView::rootIndex() const

Returns the model index of the model's root item. The root item is the parent item to the view's toplevel items. The root can be invalid.

See also setRootIndex().

[protected] void QAbstractItemView::scheduleDelayedItemsLayout()

Schedules a layout of the items in the view to be executed when the event processing starts.

Even if scheduleDelayedItemsLayout() is called multiple times before events are processed, the view will only do the layout once.

See also executeDelayedItemsLayout().

[protected] void QAbstractItemView::scrollDirtyRegion(int dx, int dy)

Prepares the view for scrolling by (dx,dy) pixels by moving the dirty regions in the opposite direction. You only need to call this function if you are implementing a scrolling viewport in your view subclass.

If you implement scrollContentsBy() in a subclass of QAbstractItemView, call this function before you call QWidget::scroll() on the viewport. Alternatively, just call update().

See also scrollContentsBy(), dirtyRegionOffset(), and setDirtyRegion().

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

Scrolls the view if necessary to ensure that the item at index is visible. The view will try to position the item according to the given hint.

In the base class this is a pure virtual function.

[virtual protected] QModelIndexList QAbstractItemView::selectedIndexes() const

This convenience function returns a list of all selected and non-hidden item indexes in the view. The list contains no duplicates, and is not sorted.

See also QItemSelectionModel::selectedIndexes().

[virtual protected] QItemSelectionModel::SelectionFlags QAbstractItemView::selectionCommand(const QModelIndex &index, const QEvent *event = nullptr) const

Returns the SelectionFlags to be used when updating a selection with to include the index specified. The event is a user input event, such as a mouse or keyboard event.

Reimplement this function to define your own selection behavior.

See also setSelection().

QItemSelectionModel *QAbstractItemView::selectionModel() const

Returns the current selection model.

See also setSelectionModel() and selectedIndexes().

[protected] void QAbstractItemView::setDirtyRegion(const QRegion &region)

Marks the given region as dirty and schedules it to be updated. You only need to call this function if you are implementing your own view subclass.

This function was introduced in Qt 4.1.

See also scrollDirtyRegion() and dirtyRegionOffset().

void QAbstractItemView::setIndexWidget(const QModelIndex &index, QWidget *widget)

Sets the given widget on the item at the given index, passing the ownership of the widget to the viewport.

If index is invalid (e.g., if you pass the root index), this function will do nothing.

The given widget's autoFillBackground property must be set to true, otherwise the widget's background will be transparent, showing both the model data and the item at the given index.

If index widget A is replaced with index widget B, index widget A will be deleted. For example, in the code snippet below, the QLineEdit object will be deleted.

setIndexWidget(index, new QLineEdit);
...
setIndexWidget(index, new QTextEdit);

This function should only be used to display static content within the visible area corresponding to an item of data. If you want to display custom dynamic content or implement a custom editor widget, subclass QStyledItemDelegate instead.

This function was introduced in Qt 4.1.

See also indexWidget() and Delegate Classes.

void QAbstractItemView::setItemDelegate(QAbstractItemDelegate *delegate)

Sets the item delegate for this view and its model to delegate. This is useful if you want complete control over the editing and display of items.

Any existing delegate will be removed, but not deleted. QAbstractItemView does not take ownership of delegate.

Warning: You should not share the same instance of a delegate between views. Doing so can cause incorrect or unintuitive editing behavior since each view connected to a given delegate may receive the closeEditor() signal, and attempt to access, modify or close an editor that has already been closed.

See also itemDelegate().

void QAbstractItemView::setItemDelegateForColumn(int column, QAbstractItemDelegate *delegate)

Sets the given item delegate used by this view and model for the given column. All items on column will be drawn and managed by delegate instead of using the default delegate (i.e., itemDelegate()).

Any existing column delegate for column will be removed, but not deleted. QAbstractItemView does not take ownership of delegate.

Note: If a delegate has been assigned to both a row and a column, the row delegate will take precedence and manage the intersecting cell index.

Warning: You should not share the same instance of a delegate between views. Doing so can cause incorrect or unintuitive editing behavior since each view connected to a given delegate may receive the closeEditor() signal, and attempt to access, modify or close an editor that has already been closed.

This function was introduced in Qt 4.2.

See also itemDelegateForColumn(), setItemDelegateForRow(), and itemDelegate().

void QAbstractItemView::setItemDelegateForRow(int row, QAbstractItemDelegate *delegate)

Sets the given item delegate used by this view and model for the given row. All items on row will be drawn and managed by delegate instead of using the default delegate (i.e., itemDelegate()).

Any existing row delegate for row will be removed, but not deleted. QAbstractItemView does not take ownership of delegate.

Note: If a delegate has been assigned to both a row and a column, the row delegate (i.e., this delegate) will take precedence and manage the intersecting cell index.

Warning: You should not share the same instance of a delegate between views. Doing so can cause incorrect or unintuitive editing behavior since each view connected to a given delegate may receive the closeEditor() signal, and attempt to access, modify or close an editor that has already been closed.

This function was introduced in Qt 4.2.

See also itemDelegateForRow(), setItemDelegateForColumn(), and itemDelegate().

[virtual] void QAbstractItemView::setModel(QAbstractItemModel *model)

Sets the model for the view to present.

This function will create and set a new selection model, replacing any model that was previously set with setSelectionModel(). However, the old selection model will not be deleted as it may be shared between several views. We recommend that you delete the old selection model if it is no longer required. This is done with the following code:

QItemSelectionModel *m = view->selectionModel();
view->setModel(new model);
delete m;

If both the old model and the old selection model do not have parents, or if their parents are long-lived objects, it may be preferable to call their deleteLater() functions to explicitly delete them.

The view does not take ownership of the model unless it is the model's parent object because the model may be shared between many different views.

See also model(), selectionModel(), and setSelectionModel().

[pure virtual protected] void QAbstractItemView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags flags)

Applies the selection flags to the items in or touched by the rectangle, rect.

When implementing your own itemview setSelection should call selectionModel()->select(selection, flags) where selection is either an empty QModelIndex or a QItemSelection that contains all items that are contained in rect.

See also selectionCommand() and selectedIndexes().

[virtual] void QAbstractItemView::setSelectionModel(QItemSelectionModel *selectionModel)

Sets the current selection model to the given selectionModel.

Note that, if you call setModel() after this function, the given selectionModel will be replaced by one created by the view.

Note: It is up to the application to delete the old selection model if it is no longer needed; i.e., if it is not being used by other views. This will happen automatically when its parent object is deleted. However, if it does not have a parent, or if the parent is a long-lived object, it may be preferable to call its deleteLater() function to explicitly delete it.

See also selectionModel(), setModel(), and clearSelection().

[protected] void QAbstractItemView::setState(QAbstractItemView::State state)

Sets the item view's state to the given state.

See also state().

[virtual] int QAbstractItemView::sizeHintForColumn(int column) const

Returns the width size hint for the specified column or -1 if there is no model.

This function is used in views with a horizontal header to find the size hint for a header section based on the contents of the given column.

See also sizeHintForRow().

QSize QAbstractItemView::sizeHintForIndex(const QModelIndex &index) const

Returns the size hint for the item with the specified index or an invalid size for invalid indexes.

See also sizeHintForRow() and sizeHintForColumn().

[virtual] int QAbstractItemView::sizeHintForRow(int row) const

Returns the height size hint for the specified row or -1 if there is no model.

The returned height is calculated using the size hints of the given row's items, i.e. the returned value is the maximum height among the items. Note that to control the height of a row, you must reimplement the QAbstractItemDelegate::sizeHint() function.

This function is used in views with a vertical header to find the size hint for a header section based on the contents of the given row.

See also sizeHintForColumn().

[virtual protected] void QAbstractItemView::startDrag(Qt::DropActions supportedActions)

Starts a drag by calling drag->exec() using the given supportedActions.

[protected] QAbstractItemView::State QAbstractItemView::state() const

Returns the item view's state.

See also setState().

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

Reimplements: QObject::timerEvent(QTimerEvent *event).

This function is called with the given event when a timer event is sent to the widget.

See also QObject::timerEvent().

[pure virtual protected] int QAbstractItemView::verticalOffset() const

Returns the vertical offset of the view.

In the base class this is a pure virtual function.

See also horizontalOffset().

[virtual protected] QStyleOptionViewItem QAbstractItemView::viewOptions() const

Returns a QStyleOptionViewItem structure populated with the view's palette, font, state, alignments etc.

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

Reimplements: QAbstractScrollArea::viewportEvent(QEvent *event).

This function is used to handle tool tips, and What's This? mode, if the given event is a QEvent::ToolTip,or a QEvent::WhatsThis. It passes all other events on to its base class viewportEvent() handler.

Returns true if event has been recognized and processed; otherwise, returns false.

[override virtual protected] QSize QAbstractItemView::viewportSizeHint() const

Reimplements: QAbstractScrollArea::viewportSizeHint() const.

This function was introduced in Qt 5.2.

[pure virtual] QRect QAbstractItemView::visualRect(const QModelIndex &index) const

Returns the rectangle on the viewport occupied by the item at index.

If your item is displayed in several areas then visualRect should return the primary area that contains index and not the complete area that index might encompasses, touch or cause drawing.

In the base class this is a pure virtual function.

See also indexAt() and visualRegionForSelection().

[pure virtual protected] QRegion QAbstractItemView::visualRegionForSelection(const QItemSelection &selection) const

Returns the region from the viewport of the items in the given selection.

In the base class this is a pure virtual function.

See also visualRect() and selectedIndexes().