qt 响应android返回键

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本文详细解析了QWidget类中的keyReleaseEvent方法，该方法用于处理键盘按键释放事件。子类可以重写此方法来响应按键释放，但必须调用基类实现以确保正确处理未使用的按键。文章强调了事件接受和忽略的重要性，以及与之相关的事件处理流程。

[virtual protected] void QWidget::keyReleaseEvent(QKeyEvent *event)
This event handler, for event event, can be reimplemented in a subclass to receive key release events for the widget.
A widget must accept focus initially and have focus in order to receive a key release event.
If you reimplement this handler, it is very important that you call the base class implementation if you do not act upon the key.
The default implementation ignores the event, so that the widget’s parent can interpret it.
Note that QKeyEvent starts with isAccepted() == true, so you do not need to call QKeyEvent::accept() - just do not call the base class implementation if you act upon the key.
See also keyPressEvent(), QEvent::ignore(), setFocusPolicy(), focusInEvent(), focusOutEvent(), event(), and QKeyEvent.

void reg_Dialog::keyReleaseEvent(QKeyEvent *event)
{
event->accept();
}