[提问]enum QDialogButtonBox::ButtonRole 这个枚举 有什么用啊？ [复制链接]

定义这个枚举 ，有什么用啊，我到现在不知道他有什么用，


QDialogButtonBox::InvalidRole              -1    The button is invalid.
QDialogButtonBox::AcceptRole             0    Clicking the button causes the dialog to be accepted (e.g. OK).
QDialogButtonBox::RejectRole              1    Clicking the button causes the dialog to be rejected (e.g. Cancel).
QDialogButtonBox::DestructiveRole      2    Clicking the button causes a destructive change (e.g. for Discarding Changes) and closes the dialog.
QDialogButtonBox::ActionRole               3    Clicking the button causes changes to the elements within the dialog.
QDialogButtonBox::HelpRole                  4    The button can be clicked to request help.
QDialogButtonBox::YesRole                   5    The button is a "Yes"-like button.
QDialogButtonBox::NoRole                     6    The button is a "No"-like button.
QDialogButtonBox::ApplyRole                8    The button applies current changes.
QDialogButtonBox::ResetRole                7    The button resets the dialog's fields to default values.



这些枚举值，对按钮来说有什么意义啊，定义这个按钮功能的吗？ 按钮功能不是 通过槽 来实现功能的吗？？