QActionEvent Class
The QActionEvent class provides an event that is generated when a QAction is added, removed, or changed. 更多...
| 头文件: | #include <QActionEvent> |
| qmake: | QT += gui |
| 基类: | QEvent |
公有函数
| QActionEvent(int type, QAction *action, QAction *before = Q_NULLPTR) | |
| QAction * | action() const |
| QAction * | before() const |
- 6 个公有函数继承自 QEvent
其他继承的成员
详细描述
The QActionEvent class provides an event that is generated when a QAction is added, removed, or changed.
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.
参见 QAction, QWidget::addAction(), QWidget::removeAction(), and QWidget::actions().
成员函数
QActionEvent::QActionEvent(int type, QAction *action, QAction *before = Q_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 0, the action is appended.
QAction *QActionEvent::action() const
Returns the action that is changed, added, or removed.
参见 before().
QAction *QActionEvent::before() const
If type() is ActionAdded, returns the action that should appear before action(). If this function returns 0, the action should be appended to already existing actions on the same widget.
参见 action() and QWidget::actions().