qt keyPressEvent函数方向键没有响应键盘事件的解决方法

Posted 2022-11-16 zhujiangm

某段程序中发现重载keyPressEvent后不能收到方向键的响应。查看qt说明文档：

This event handler, for event event, can be reimplemented in a subclass to receive key press events for the widget.

A widget must call setFocusPolicy() to accept focus initially and have focus in order to receive a key press event.

即：加上　setFocusPolicy()。

另一种方法：

重载keyReleaseEvent事件处理。