QItemSelectionModel

The QItemSelectionModel class keeps track of a view’s selected items. More…

Synopsis

Functions

• def columnIntersectsSelection (column, parent)

• def currentIndex ()

• def emitSelectionChanged (newSelection, oldSelection)

• def hasSelection ()

• def isColumnSelected (column, parent)

• def isRowSelected (row, parent)

• def isSelected (index)

• def model ()

• def rowIntersectsSelection (row, parent)

• def selectedColumns ([row=0])

• def selectedIndexes ()

• def selectedRows ([column=0])

• def selection ()

• def setModel (model)

Virtual functions

• def clear ()

• def clearCurrentIndex ()

• def reset ()

• def select (index, command)

• def select (selection, command)

• def setCurrentIndex (index, command)

Slots

• def clearSelection ()

Signals

• def currentChanged (current, previous)

• def currentColumnChanged (current, previous)

• def currentRowChanged (current, previous)

• def modelChanged (model)

• def selectionChanged (selected, deselected)

Detailed Description

A QItemSelectionModel keeps track of the selected items in a view, or in several views onto the same model. It also keeps track of the currently selected item in a view.

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

The selected items are stored using ranges. Whenever you want to modify the selected items use select() and provide either a QItemSelection , or a QModelIndex and a SelectionFlag .

The QItemSelectionModel takes a two layer approach to selection management, dealing with both selected items that have been committed and items that are part of the current selection. The current selected items are part of the current interactive selection (for example with rubber-band selection or keyboard-shift selections).

To update the currently selected items, use the bitwise OR of Current and any of the other SelectionFlags . If you omit the Current command, a new current selection will be created, and the previous one added to the whole selection. All functions operate on both layers; for example, selecteditems() will return items from both layers.

Note

Since 5.5, model , hasSelection , and currentIndex are meta-object properties.

See also

Model/View Programming QAbstractItemModel Chart Example

class QItemSelectionModel([model=None])

QItemSelectionModel(model, parent)

param parent

QObject

param model

QAbstractItemModel

Constructs a selection model that operates on the specified item model .

Constructs a selection model that operates on the specified item model with parent .

PySide2.QtCore.QItemSelectionModel.SelectionFlag

This enum describes the way the selection model will be updated.

Constant	Description
QItemSelectionModel.NoUpdate	No selection will be made.
QItemSelectionModel.Clear	The complete selection will be cleared.
QItemSelectionModel.Select	All specified indexes will be selected.
QItemSelectionModel.Deselect	All specified indexes will be deselected.
QItemSelectionModel.Toggle	All specified indexes will be selected or deselected depending on their current state.
QItemSelectionModel.Current	The current selection will be updated.
QItemSelectionModel.Rows	All indexes will be expanded to span rows.
QItemSelectionModel.Columns	All indexes will be expanded to span columns.
QItemSelectionModel.SelectCurrent	A combination of Select and Current, provided for convenience.
QItemSelectionModel.ToggleCurrent	A combination of Toggle and Current, provided for convenience.
QItemSelectionModel.ClearAndSelect	A combination of Clear and Select, provided for convenience.

PySide2.QtCore.QItemSelectionModel.clear()

Clears the selection model. Emits selectionChanged() and currentChanged() .

PySide2.QtCore.QItemSelectionModel.clearCurrentIndex()

Clears the current index. Emits currentChanged() .

PySide2.QtCore.QItemSelectionModel.clearSelection()

Clears the selection in the selection model. Emits selectionChanged() .

PySide2.QtCore.QItemSelectionModel.columnIntersectsSelection(column, parent)

Parameters

• column – int

• parent – QModelIndex

Return type

bool

Returns true if there are any items selected in the column with the given parent .

PySide2.QtCore.QItemSelectionModel.currentChanged(current, previous)

Parameters

• current – QModelIndex

• previous – QModelIndex

PySide2.QtCore.QItemSelectionModel.currentColumnChanged(current, previous)

Parameters

• current – QModelIndex

• previous – QModelIndex

PySide2.QtCore.QItemSelectionModel.currentIndex()

Return type

QModelIndex

Returns the model item index for the current item, or an invalid index if there is no current item.

See also

setCurrentIndex()

PySide2.QtCore.QItemSelectionModel.currentRowChanged(current, previous)

Parameters

• current – QModelIndex

• previous – QModelIndex

PySide2.QtCore.QItemSelectionModel.emitSelectionChanged(newSelection, oldSelection)

Parameters

• newSelection – QItemSelection

• oldSelection – QItemSelection

Compares the two selections newSelection and oldSelection and emits selectionChanged() with the deselected and selected items.

PySide2.QtCore.QItemSelectionModel.hasSelection()

Return type

bool

Returns true if the selection model contains any selection ranges; otherwise returns false .

PySide2.QtCore.QItemSelectionModel.isColumnSelected(column, parent)

Parameters

• column – int

• parent – QModelIndex

Return type

bool

Returns true if all items are selected in the column with the given parent .

Note that this function is usually faster than calling isSelected() on all items in the same column and that unselectable items are ignored.

PySide2.QtCore.QItemSelectionModel.isRowSelected(row, parent)

Parameters

• row – int

• parent – QModelIndex

Return type

bool

Returns true if all items are selected in the row with the given parent .

Note that this function is usually faster than calling isSelected() on all items in the same row and that unselectable items are ignored.

PySide2.QtCore.QItemSelectionModel.isSelected(index)

Parameters

index – QModelIndex

Return type

bool

Returns true if the given model item index is selected.

PySide2.QtCore.QItemSelectionModel.model()

Return type

QAbstractItemModel

Returns the item model operated on by the selection model.

See also

setModel()

PySide2.QtCore.QItemSelectionModel.modelChanged(model)

Parameters

model – QAbstractItemModel

PySide2.QtCore.QItemSelectionModel.reset()

Clears the selection model. Does not emit any signals.

PySide2.QtCore.QItemSelectionModel.rowIntersectsSelection(row, parent)

Parameters

• row – int

• parent – QModelIndex

Return type

bool

Returns true if there are any items selected in the row with the given parent .

PySide2.QtCore.QItemSelectionModel.select(index, command)

Parameters

• index – QModelIndex

• command – SelectionFlags

PySide2.QtCore.QItemSelectionModel.select(selection, command)

Parameters

• selection – QItemSelection

• command – SelectionFlags

PySide2.QtCore.QItemSelectionModel.selectedColumns([row=0])

Parameters

row – int

Return type

QModelIndexList

Returns the indexes in the given row for columns where all rows are selected.

See also

selectedIndexes() selectedRows()

PySide2.QtCore.QItemSelectionModel.selectedIndexes()

Return type

QModelIndexList

Returns a list of all selected model item indexes. The list contains no duplicates, and is not sorted.

PySide2.QtCore.QItemSelectionModel.selectedRows([column=0])

Parameters

column – int

Return type

QModelIndexList

Returns the indexes in the given column for the rows where all columns are selected.

See also

selectedIndexes() selectedColumns()

PySide2.QtCore.QItemSelectionModel.selection()

Return type

QItemSelection

Returns the selection ranges stored in the selection model.

PySide2.QtCore.QItemSelectionModel.selectionChanged(selected, deselected)

Parameters

• selected – QItemSelection

• deselected – QItemSelection

PySide2.QtCore.QItemSelectionModel.setCurrentIndex(index, command)

Parameters

• index – QModelIndex

• command – SelectionFlags

Sets the model item index to be the current item, and emits currentChanged() . The current item is used for keyboard navigation and focus indication; it is independent of any selected items, although a selected item can also be the current item.

Depending on the specified command , the index can also become part of the current selection.

See also

currentIndex() select()

PySide2.QtCore.QItemSelectionModel.setModel(model)

Parameters

model – QAbstractItemModel

Sets the model to model . The modelChanged() signal will be emitted.

See also

model() modelChanged()