QFocusEvent Class
The QFocusEvent class contains event parameters for widget focus events. 更多...
| 头文件: | #include <QFocusEvent> |
| qmake: | QT += gui |
| 基类: | QEvent |
公有函数
| QFocusEvent(Type type, Qt::FocusReason reason = Qt::OtherFocusReason) | |
| bool | gotFocus() const |
| bool | lostFocus() const |
| Qt::FocusReason | reason() const |
- 6 个公有函数继承自 QEvent
其他继承的成员
详细描述
The QFocusEvent class contains event parameters for widget focus events.
Focus events are sent to widgets when the keyboard input focus changes. Focus events occur due to mouse actions, key presses (such as Tab or Backtab), the window system, popup menus, keyboard shortcuts, or other application-specific reasons. The reason for a particular focus event is returned by reason() in the appropriate event handler.
The event handlers QWidget::focusInEvent(), QWidget::focusOutEvent(), QGraphicsItem::focusInEvent and QGraphicsItem::focusOutEvent() receive focus events.
参见 QWidget::setFocus(), QWidget::setFocusPolicy(), and Keyboard Focus in Widgets.
成员函数
QFocusEvent::QFocusEvent(Type type, Qt::FocusReason reason = Qt::OtherFocusReason)
Constructs a focus event object.
The type parameter must be either QEvent::FocusIn or QEvent::FocusOut. The reason describes the cause of the change in focus.
bool QFocusEvent::gotFocus() const
Returns true if type() is QEvent::FocusIn; otherwise returns false.
bool QFocusEvent::lostFocus() const
Returns true if type() is QEvent::FocusOut; otherwise returns false.
Qt::FocusReason QFocusEvent::reason() const
Returns the reason for this focus event.