QActionEvent Class

The QActionEvent class provides an event that is generated when a QAction is added, removed, or changed. More...

Header: #include <QActionEvent>
qmake: QT += gui
Inherits: QEvent

Public Functions

QActionEvent(int type, QAction *action, QAction *before = nullptr)
QAction *action() const
QAction *before() const

Detailed Description

Actions can be added to widgets using QWidget::addAction(). This generates an ActionAdded event, which you can handle to provide custom behavior. For example, QToolBar reimplements QWidget::actionEvent() to create QToolButtons for the actions.

See also QAction, QWidget::addAction(), QWidget::removeAction(), and QWidget::actions().

Member Function Documentation

QActionEvent::QActionEvent(int type, QAction *action, QAction *before = nullptr)

Constructs an action event. The type can be ActionChanged, ActionAdded, or ActionRemoved.

action is the action that is changed, added, or removed. If type is ActionAdded, the action is to be inserted before the action before. If before is nullptr, the action is appended.

QAction *QActionEvent::action() const

Returns the action that is changed, added, or removed.

See also before().

QAction *QActionEvent::before() const

If type() is ActionAdded, returns the action that should appear before action(). If this function returns nullptr, the action should be appended to already existing actions on the same widget.

See also action() and QWidget::actions().

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.