QListView

The QListView class provides a list or icon view onto a model. More

Inheritance diagram of PySide2.QtWidgets.QListView

Inherited by: QHelpIndexWidget, QListWidget, QUndoView

Synopsis

Functions

Signals

Detailed Description

../../_images/windows-listview.png

A QListView presents items stored in a model, either as a simple non-hierarchical list, or as a collection of icons. This class is used to provide lists and icon views that were previously provided by the QListBox and QIconView classes, but using the more flexible approach provided by Qt’s model/view architecture.

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

This view does not display horizontal or vertical headers; to display a list of items with a horizontal header, use QTreeView instead.

QListView implements the interfaces defined by the QAbstractItemView class to allow it to display data provided by models derived from the QAbstractItemModel class.

Items in a list view can be displayed using one of two view modes: In ListMode , the items are displayed in the form of a simple list; in IconMode , the list view takes the form of an icon view in which the items are displayed with icons like files in a file manager. By default, the list view is in ListMode . To change the view mode, use the setViewMode() function, and to determine the current view mode, use viewMode() .

Items in these views are laid out in the direction specified by the flow() of the list view. The items may be fixed in place, or allowed to move, depending on the view’s movement() state.

If the items in the model cannot be completely laid out in the direction of flow, they can be wrapped at the boundary of the view widget; this depends on isWrapping() . This property is useful when the items are being represented by an icon view.

The resizeMode() and layoutMode() govern how and when the items are laid out. Items are spaced according to their spacing() , and can exist within a notional grid of size specified by gridSize() . The items can be rendered as large or small icons depending on their iconSize() .

Improving Performance

It is possible to give the view hints about the data it is handling in order to improve its performance when displaying large numbers of items. One approach that can be taken for views that are intended to display items with equal sizes is to set the uniformItemSizes property to true.

class PySide2.QtWidgets.QListView([parent=None])

Creates a new QListView with the given parent to view a model. Use setModel() to set the model.

PySide2.QtWidgets.QListView.Movement

Constant

Description

QListView.Static

The items cannot be moved by the user.

QListView.Free

The items can be moved freely by the user.

QListView.Snap

The items snap to the specified grid when moved; see setGridSize() .

PySide2.QtWidgets.QListView.Flow

Constant

Description

QListView.LeftToRight

The items are laid out in the view from the left to the right.

QListView.TopToBottom

The items are laid out in the view from the top to the bottom.

PySide2.QtWidgets.QListView.ResizeMode

Constant

Description

QListView.Fixed

The items will only be laid out the first time the view is shown.

QListView.Adjust

The items will be laid out every time the view is resized.

PySide2.QtWidgets.QListView.LayoutMode

Constant

Description

QListView.SinglePass

The items are laid out all at once.

QListView.Batched

The items are laid out in batches of batchSize items.

See also

batchSize

PySide2.QtWidgets.QListView.ViewMode

Constant

Description

QListView.ListMode

The items are laid out using TopToBottom flow, with Small size and Static movement

QListView.IconMode

The items are laid out using LeftToRight flow, with Large size and Free movement

PySide2.QtWidgets.QListView.batchSize()
Return type

int

This property holds the number of items laid out in each batch if layoutMode is set to Batched .

The default value is 100.

PySide2.QtWidgets.QListView.clearPropertyFlags()

Clears the QListView -specific property flags. See viewMode .

Properties inherited from QAbstractItemView are not covered by the property flags. Specifically, dragEnabled and acceptsDrops are computed by QListView when calling setMovement() or setViewMode() .

PySide2.QtWidgets.QListView.contentsSize()
Return type

PySide2.QtCore.QSize

PySide2.QtWidgets.QListView.flow()
Return type

Flow

This property holds which direction the items layout should flow..

If this property is LeftToRight , the items will be laid out left to right. If the isWrapping property is true , the layout will wrap when it reaches the right side of the visible area. If this property is TopToBottom , the items will be laid out from the top of the visible area, wrapping when it reaches the bottom.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is set to TopToBottom .

See also

viewMode

PySide2.QtWidgets.QListView.gridSize()
Return type

PySide2.QtCore.QSize

This property holds the size of the layout grid.

This property is the size of the grid in which the items are laid out. The default is an empty size which means that there is no grid and the layout is not done in a grid. Setting this property to a non-empty size switches on the grid layout. (When a grid layout is in force the spacing property is ignored.)

Setting this property when the view is visible will cause the items to be laid out again.

See also

viewMode

PySide2.QtWidgets.QListView.indexesMoved(indexes)
Parameters

indexesQModelIndexList

PySide2.QtWidgets.QListView.isRowHidden(row)
Parameters

row – int

Return type

bool

Returns true if the row is hidden; otherwise returns false .

PySide2.QtWidgets.QListView.isSelectionRectVisible()
Return type

bool

This property holds if the selection rectangle should be visible.

If this property is true then the selection rectangle is visible; otherwise it will be hidden.

Note

The selection rectangle will only be visible if the selection mode is in a mode where more than one item can be selected; i.e., it will not draw a selection rectangle if the selection mode is SingleSelection .

By default, this property is false .

PySide2.QtWidgets.QListView.isWrapping()
Return type

bool

This property holds whether the items layout should wrap..

This property holds whether the layout should wrap when there is no more space in the visible area. The point at which the layout wraps depends on the flow property.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is false .

See also

viewMode

PySide2.QtWidgets.QListView.itemAlignment()
Return type

Alignment

This property holds the alignment of each item in its cell.

This is only supported in ListMode with TopToBottom flow and with wrapping enabled. The default alignment is 0, which means that an item fills its cell entirely.

PySide2.QtWidgets.QListView.layoutMode()
Return type

LayoutMode

This property determines whether the layout of items should happen immediately or be delayed..

This property holds the layout mode for the items. When the mode is SinglePass (the default), the items are laid out all in one go. When the mode is Batched , the items are laid out in batches of batchSize items, while processing events. This makes it possible to instantly view and interact with the visible items while the rest are being laid out.

See also

viewMode

PySide2.QtWidgets.QListView.modelColumn()
Return type

int

This property holds the column in the model that is visible.

By default, this property contains 0, indicating that the first column in the model will be shown.

PySide2.QtWidgets.QListView.movement()
Return type

Movement

This property holds whether the items can be moved freely, are snapped to a grid, or cannot be moved at all..

This property determines how the user can move the items in the view. Static means that the items can’t be moved the user. Free means that the user can drag and drop the items to any position in the view. Snap means that the user can drag and drop the items, but only to the positions in a notional grid signified by the gridSize property.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is set to Static .

PySide2.QtWidgets.QListView.rectForIndex(index)
Parameters

indexPySide2.QtCore.QModelIndex

Return type

PySide2.QtCore.QRect

Returns the rectangle of the item at position index in the model. The rectangle is in contents coordinates.

See also

visualRect()

PySide2.QtWidgets.QListView.resizeContents(width, height)
Parameters
  • width – int

  • height – int

Resize the internal contents to width and height and set the scroll bar ranges accordingly.

PySide2.QtWidgets.QListView.resizeMode()
Return type

ResizeMode

This property holds whether the items are laid out again when the view is resized..

If this property is Adjust , the items will be laid out again when the view is resized. If the value is Fixed , the items will not be laid out when the view is resized.

By default, this property is set to Fixed .

PySide2.QtWidgets.QListView.setBatchSize(batchSize)
Parameters

batchSize – int

This property holds the number of items laid out in each batch if layoutMode is set to Batched .

The default value is 100.

PySide2.QtWidgets.QListView.setFlow(flow)
Parameters

flowFlow

This property holds which direction the items layout should flow..

If this property is LeftToRight , the items will be laid out left to right. If the isWrapping property is true , the layout will wrap when it reaches the right side of the visible area. If this property is TopToBottom , the items will be laid out from the top of the visible area, wrapping when it reaches the bottom.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is set to TopToBottom .

See also

viewMode

PySide2.QtWidgets.QListView.setGridSize(size)
Parameters

sizePySide2.QtCore.QSize

This property holds the size of the layout grid.

This property is the size of the grid in which the items are laid out. The default is an empty size which means that there is no grid and the layout is not done in a grid. Setting this property to a non-empty size switches on the grid layout. (When a grid layout is in force the spacing property is ignored.)

Setting this property when the view is visible will cause the items to be laid out again.

See also

viewMode

PySide2.QtWidgets.QListView.setItemAlignment(alignment)
Parameters

alignmentAlignment

This property holds the alignment of each item in its cell.

This is only supported in ListMode with TopToBottom flow and with wrapping enabled. The default alignment is 0, which means that an item fills its cell entirely.

PySide2.QtWidgets.QListView.setLayoutMode(mode)
Parameters

modeLayoutMode

This property determines whether the layout of items should happen immediately or be delayed..

This property holds the layout mode for the items. When the mode is SinglePass (the default), the items are laid out all in one go. When the mode is Batched , the items are laid out in batches of batchSize items, while processing events. This makes it possible to instantly view and interact with the visible items while the rest are being laid out.

See also

viewMode

PySide2.QtWidgets.QListView.setModelColumn(column)
Parameters

column – int

This property holds the column in the model that is visible.

By default, this property contains 0, indicating that the first column in the model will be shown.

PySide2.QtWidgets.QListView.setMovement(movement)
Parameters

movementMovement

This property holds whether the items can be moved freely, are snapped to a grid, or cannot be moved at all..

This property determines how the user can move the items in the view. Static means that the items can’t be moved the user. Free means that the user can drag and drop the items to any position in the view. Snap means that the user can drag and drop the items, but only to the positions in a notional grid signified by the gridSize property.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is set to Static .

PySide2.QtWidgets.QListView.setPositionForIndex(position, index)
Parameters

Sets the contents position of the item at index in the model to the given position . If the list view’s movement mode is Static or its view mode is ListView , this function will have no effect.

PySide2.QtWidgets.QListView.setResizeMode(mode)
Parameters

modeResizeMode

This property holds whether the items are laid out again when the view is resized..

If this property is Adjust , the items will be laid out again when the view is resized. If the value is Fixed , the items will not be laid out when the view is resized.

By default, this property is set to Fixed .

PySide2.QtWidgets.QListView.setRowHidden(row, hide)
Parameters
  • row – int

  • hide – bool

If hide is true, the given row will be hidden; otherwise the row will be shown.

See also

isRowHidden()

PySide2.QtWidgets.QListView.setSelectionRectVisible(show)
Parameters

show – bool

This property holds if the selection rectangle should be visible.

If this property is true then the selection rectangle is visible; otherwise it will be hidden.

Note

The selection rectangle will only be visible if the selection mode is in a mode where more than one item can be selected; i.e., it will not draw a selection rectangle if the selection mode is SingleSelection .

By default, this property is false .

PySide2.QtWidgets.QListView.setSpacing(space)
Parameters

space – int

This property holds the space around the items in the layout.

This property is the size of the empty space that is padded around an item in the layout.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property contains a value of 0.

See also

viewMode

PySide2.QtWidgets.QListView.setUniformItemSizes(enable)
Parameters

enable – bool

This property holds whether all items in the listview have the same size.

This property should only be set to true if it is guaranteed that all items in the view have the same size. This enables the view to do some optimizations for performance purposes.

By default, this property is false .

PySide2.QtWidgets.QListView.setViewMode(mode)
Parameters

modeViewMode

This property holds the view mode of the QListView ..

This property will change the other unset properties to conform with the set view mode. QListView -specific properties that have already been set will not be changed, unless clearPropertyFlags() has been called.

Setting the view mode will enable or disable drag and drop based on the selected movement. For ListMode , the default movement is Static (drag and drop disabled); for IconMode , the default movement is Free (drag and drop enabled).

PySide2.QtWidgets.QListView.setWordWrap(on)
Parameters

on – bool

This property holds the item text word-wrapping policy.

If this property is true then the item text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all. This property is false by default.

Please note that even if wrapping is enabled, the cell will not be expanded to make room for the text. It will print ellipsis for text that cannot be shown, according to the view’s textElideMode .

PySide2.QtWidgets.QListView.setWrapping(enable)
Parameters

enable – bool

This property holds whether the items layout should wrap..

This property holds whether the layout should wrap when there is no more space in the visible area. The point at which the layout wraps depends on the flow property.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property is false .

See also

viewMode

PySide2.QtWidgets.QListView.spacing()
Return type

int

This property holds the space around the items in the layout.

This property is the size of the empty space that is padded around an item in the layout.

Setting this property when the view is visible will cause the items to be laid out again.

By default, this property contains a value of 0.

See also

viewMode

PySide2.QtWidgets.QListView.uniformItemSizes()
Return type

bool

This property holds whether all items in the listview have the same size.

This property should only be set to true if it is guaranteed that all items in the view have the same size. This enables the view to do some optimizations for performance purposes.

By default, this property is false .

PySide2.QtWidgets.QListView.viewMode()
Return type

ViewMode

This property holds the view mode of the QListView ..

This property will change the other unset properties to conform with the set view mode. QListView -specific properties that have already been set will not be changed, unless clearPropertyFlags() has been called.

Setting the view mode will enable or disable drag and drop based on the selected movement. For ListMode , the default movement is Static (drag and drop disabled); for IconMode , the default movement is Free (drag and drop enabled).

PySide2.QtWidgets.QListView.wordWrap()
Return type

bool

This property holds the item text word-wrapping policy.

If this property is true then the item text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all. This property is false by default.

Please note that even if wrapping is enabled, the cell will not be expanded to make room for the text. It will print ellipsis for text that cannot be shown, according to the view’s textElideMode .