QFocusEvent Class
QFocusEvent 类包含用于小部件焦点事件的事件参数。更多内容...
| 头文件： | #include <QFocusEvent> |
| CMake： | find_package(Qt6 REQUIRED COMPONENTS Gui) target_link_libraries(mytarget PRIVATE Qt6::Gui) |
| qmake： | QT += gui |
| 继承自： | QEvent |
- 所有成员列表（包括继承的成员）
- QFocusEvent 属于事件类。
公共函数
| QFocusEvent(QEvent::Type type, Qt::FocusReason reason = Qt::OtherFocusReason) | |
| bool | gotFocus() const |
| bool | lostFocus() const |
| Qt::FocusReason | reason() const |
受保护函数
| QFocusEvent(QFocusEvent &&) | |
| QFocusEvent & | operator=(QFocusEvent &&) |
| QFocusEvent & | operator=(const QFocusEvent &other) |
详细说明
当键盘输入焦点发生变化时，焦点事件会发送给小部件。焦点事件可能由鼠标操作、按键（例如Tab 或Backtab ）、窗口系统、弹出菜单、键盘快捷键或其他特定于应用程序的原因触发。特定焦点事件的触发原因将由相应事件处理程序中的reason() 返回。
事件处理程序QWidget::focusInEvent()、QWidget::focusOutEvent()、QGraphicsItem::focusInEvent 和QGraphicsItem::focusOutEvent() 会接收焦点事件。
另请参阅 QWidget::setFocus()、QWidget::setFocusPolicy() 以及“控件中的键盘焦点”。
成员函数文档
[explicit] QFocusEvent::QFocusEvent(QEvent::Type type, Qt::FocusReason reason = Qt::OtherFocusReason)
构建一个焦点事件对象。
type 参数必须为QEvent::FocusIn 或QEvent::FocusOut 。reason 描述了焦点变化的原因。
[protected delete] QFocusEvent::QFocusEvent(QFocusEvent &&)
通过移动构造一个QFocusEvent 的实例。该函数已被删除。
bool QFocusEvent::gotFocus() const
如果type()的结果是QEvent::FocusIn ，则返回true ；否则返回false。
bool QFocusEvent::lostFocus() const
如果type()的值为QEvent::FocusOut ，则返回true ；否则返回false。
Qt::FocusReason QFocusEvent::reason() const
返回此焦点事件的原因。
[protected delete] QFocusEvent &QFocusEvent::operator=(QFocusEvent &&)
将other 按移动赋值给此QFocusEvent 实例。该函数已被删除。
[noexcept protected default] QFocusEvent &QFocusEvent::operator=(const QFocusEvent &other)
将other 复制并赋值给此QFocusEvent 实例。
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