You must explicitly add the button to the sizer, however, for the sizer's layout algorithm to be aware of it.

但必须将按钮显式地添加到sizer，以便sizer的布局算法知道它。

youdao

When you do add the button, you also tell the sizer to surround the button with a border of 50 pixels.

当添加按钮时，sizer还会用50像素的边框围绕按钮。

youdao

When you do add the button, you also tell the sizer to surround the button with a border of 50 pixels.

当添加按钮时，sizer还会用50像素的边框围绕按钮。

youdao