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QListWidget Class Reference
[QtGui module]

The QListWidget class provides an item-based list widget. More...

Inherits QListView.

Methods

Special Methods

Qt Signals


Detailed Description

The QListWidget class provides an item-based list widget.

QListWidget is a convenience class that provides a list view similar to the one supplied by QListView, but with a classic item-based interface for adding and removing items. QListWidget uses an internal model to manage each QListWidgetItem in the list.

For a more flexible list view widget, use the QListView class with a standard model.

List widgets are constructed in the same way as other widgets:

     QListWidget *listWidget = new QListWidget(this);

The selectionMode() of a list widget determines how many of the items in the list can be selected at the same time, and whether complex selections of items can be created. This can be set with the setSelectionMode() function.

There are two ways to add items to the list: they can be constructed with the list widget as their parent widget, or they can be constructed with no parent widget and added to the list later. If a list widget already exists when the items are constructed, the first method is easier to use:

     new QListWidgetItem(tr("Oak"), listWidget);
     new QListWidgetItem(tr("Fir"), listWidget);
     new QListWidgetItem(tr("Pine"), listWidget);

If you need to insert a new item into the list at a particular position, then it should be constructed without a parent widget. The insertItem() function should then be used to place it within the list. The list widget will take ownership of the item.

     QListWidgetItem *newItem = new QListWidgetItem;
     newItem->setText(itemText);
     listWidget->insertItem(row, newItem);

For multiple items, insertItems() can be used instead. The number of items in the list is found with the count() function. To remove items from the list, use takeItem().

The current item in the list can be found with currentItem(), and changed with setCurrentItem(). The user can also change the current item by navigating with the keyboard or clicking on a different item. When the current item changes, the currentItemChanged() signal is emitted with the new current item and the item that was previously current.

Screenshot of a Windows XP style list widget Screenshot of a Macintosh style table widget Screenshot of a Plastique style table widget
A Windows XP style list widget. A Macintosh style list widget. A Plastique style list widget.

Method Documentation

QListWidget.__init__ (self, QWidget parent = None)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

Constructs an empty QListWidget with the given parent.

QListWidget.addItem (self, QListWidgetItem aitem)

The aitem argument has it's ownership transferred to Qt.

Inserts an item with the text label at the end of the list widget.

QListWidget.addItem (self, QString label)

Inserts the item at the end of the list widget.

Warning: A QListWidgetItem can only be added to a QListWidget once. Adding the same QListWidgetItem multiple times to a QListWidget will result in undefined behavior.

See also insertItem().

QListWidget.addItems (self, QStringList labels)

Inserts items with the text labels at the end of the list widget.

See also insertItems().

QListWidget.clear (self)

This method is also a Qt slot with the C++ signature void clear().

Removes all items and selections in the view.

Warning: All items will be permanently deleted.

QListWidget.closePersistentEditor (self, QListWidgetItem item)

Closes the persistent editor for the given item.

See also openPersistentEditor().

int QListWidget.count (self)

QListWidgetItem QListWidget.currentItem (self)

Returns the current item.

See also setCurrentItem().

int QListWidget.currentRow (self)

QListWidget.dropEvent (self, QDropEvent event)

Reimplemented from QWidget.dropEvent().

bool QListWidget.dropMimeData (self, int index, QMimeData data, Qt.DropAction action)

Handles data supplied by an external drag and drop operation that ended with the given action in the given index. Returns true if data and action can be handled by the model; otherwise returns false.

See also supportedDropActions().

QListWidget.editItem (self, QListWidgetItem item)

Starts editing the item if it is editable.

bool QListWidget.event (self, QEvent e)

Reimplemented from QObject.event().

list-of-QListWidgetItem QListWidget.findItems (self, QString text, Qt.MatchFlags flags)

Finds items with the text that matches the string text using the given flags.

QModelIndex QListWidget.indexFromItem (self, QListWidgetItem item)

Returns the QModelIndex assocated with the given item.

QListWidget.insertItem (self, int row, QListWidgetItem item)

The item argument has it's ownership transferred to Qt.

Inserts the item at the position in the list given by row.

See also addItem().

QListWidget.insertItem (self, int row, QString label)

Inserts an item with the text label in the list widget at the position given by row.

See also addItem().

QListWidget.insertItems (self, int row, QStringList labels)

Inserts items from the list of labels into the list, starting at the given row.

See also insertItem() and addItem().

bool QListWidget.isItemHidden (self, QListWidgetItem item)

bool QListWidget.isItemSelected (self, QListWidgetItem item)

bool QListWidget.isSortingEnabled (self)

QListWidgetItem QListWidget.item (self, int row)

Returns the item that occupies the given row in the list if one has been set; otherwise returns 0.

See also row().

QListWidgetItem QListWidget.itemAt (self, QPoint p)

Returns a pointer to the item at the coordinates p. The coordinates are relative to the list widget's viewport().

QListWidgetItem QListWidget.itemAt (self, int ax, int ay)

This is an overloaded function.

Returns a pointer to the item at the coordinates (x, y). The coordinates are relative to the list widget's viewport().

QListWidgetItem QListWidget.itemFromIndex (self, QModelIndex index)

Returns a pointer to the QListWidgetItem assocated with the given index.

list-of-QListWidgetItem QListWidget.items (self, QMimeData data)

Returns a list of pointers to the items contained in the data object. If the object was not created by a QListWidget in the same process, the list is empty.

QWidget QListWidget.itemWidget (self, QListWidgetItem item)

Returns the widget displayed in the given item.

This function was introduced in Qt 4.1.

See also setItemWidget().

QMimeData QListWidget.mimeData (self, list-of-QListWidgetItem items)

The QMimeData result

Returns an object that contains a serialized description of the specified items. The format used to describe the items is obtained from the mimeTypes() function.

If the list of items is empty, 0 is returned instead of a serialized empty list.

QStringList QListWidget.mimeTypes (self)

Returns a list of MIME types that can be used to describe a list of listwidget items.

See also mimeData().

QListWidget.openPersistentEditor (self, QListWidgetItem item)

Opens an editor for the given item. The editor remains open after editing.

See also closePersistentEditor().

QListWidget.removeItemWidget (self, QListWidgetItem aItem)

Removes the widget set on the given item.

This function was introduced in Qt 4.3.

int QListWidget.row (self, QListWidgetItem item)

Returns the row containing the given item.

See also item().

QListWidget.scrollToItem (self, QListWidgetItem item, QAbstractItemView.ScrollHint hint = QAbstractItemView.EnsureVisible)

This method is also a Qt slot with the C++ signature void scrollToItem(const QListWidgetItem *,QAbstractItemView::ScrollHint = QAbstractItemView.EnsureVisible).

Scrolls the view if necessary to ensure that the item is visible.

hint specifies where the item should be located after the operation.

list-of-QListWidgetItem QListWidget.selectedItems (self)

Returns a list of all selected items in the list widget.

QListWidget.setCurrentItem (self, QListWidgetItem item)

Sets the current item to item.

Unless the selection mode is NoSelection, the item is also be selected.

See also currentItem().

QListWidget.setCurrentItem (self, QListWidgetItem item, QItemSelectionModel.SelectionFlags command)

Set the current item to item, using the given command.

This function was introduced in Qt 4.4.

QListWidget.setCurrentRow (self, int row)

QListWidget.setCurrentRow (self, int row, QItemSelectionModel.SelectionFlags command)

QListWidget.setItemHidden (self, QListWidgetItem item, bool hide)

QListWidget.setItemSelected (self, QListWidgetItem item, bool select)

QListWidget.setItemWidget (self, QListWidgetItem item, QWidget widget)

The widget argument has it's ownership transferred to Qt.

Sets the widget to be displayed in the give item.

This function should only be used to display static content in the place of a list widget item. If you want to display custom dynamic content or implement a custom editor widget, use QListView and subclass QItemDelegate instead.

This function was introduced in Qt 4.1.

See also itemWidget() and Delegate Classes.

QListWidget.setSortingEnabled (self, bool enable)

QListWidget.sortItems (self, Qt.SortOrder order = Qt.AscendingOrder)

Sorts all the items in the list widget according to the specified order.

Qt.DropActions QListWidget.supportedDropActions (self)

Returns the drop actions supported by this view.

See also Qt.DropActions.

QListWidgetItem QListWidget.takeItem (self, int row)

The QListWidgetItem result

Removes and returns the item from the given row in the list widget; otherwise returns 0.

Items removed from a list widget will not be managed by Qt, and will need to be deleted manually.

See also insertItem() and addItem().

QRect QListWidget.visualItemRect (self, QListWidgetItem item)

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

QListWidget.__len__ (self)


Qt Signal Documentation

void currentItemChanged (QListWidgetItem *,QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted whenever the current item changes.

previous is the item that previously had the focus; current is the new current item.

void currentRowChanged (int)

This is the default overload of this signal.

This signal is emitted whenever the current item changes.

currentRow is the row of the current item. If there is no current item, the currentRow is -1.

void currentTextChanged (const QString&)

This is the default overload of this signal.

This signal is emitted whenever the current item changes.

currentText is the text data in the current item. If there is no current item, the currentText is invalid.

void itemActivated (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted when the item is activated. The item is activated when the user clicks or double clicks on it, depending on the system configuration. It is also activated when the user presses the activation key (on Windows and X11 this is the Return key, on Mac OS X it is Ctrl+0).

void itemChanged (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted whenever the data of item has changed.

void itemClicked (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted with the specified item when a mouse button is clicked on an item in the widget.

See also itemPressed() and itemDoubleClicked().

void itemDoubleClicked (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted with the specified item when a mouse button is double clicked on an item in the widget.

See also itemClicked() and itemPressed().

void itemEntered (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted when the mouse cursor enters an item. The item is the item entered. This signal is only emitted when mouseTracking is turned on, or when a mouse button is pressed while moving into an item.

See also QWidget.setMouseTracking().

void itemPressed (QListWidgetItem *)

This is the default overload of this signal.

This signal is emitted with the specified item when a mouse button is pressed on an item in the widget.

See also itemClicked() and itemDoubleClicked().

void itemSelectionChanged ()

This is the default overload of this signal.

This signal is emitted whenever the selection changes.

See also selectedItems(), QListWidgetItem.isSelected(), and currentItemChanged().


PyQt 4.9.4 for WindowsCopyright © Riverbank Computing Ltd and Nokia 2012Qt 4.8.2