Pmw.py 文件源码

def _previous(self, event):
        size = self.size()
        if size <= 1:
            return

        cursels = self.curselection()

        if len(cursels) == 0:
            index = size - 1
        else:
            index = string.atoi(cursels[0])
            if index == 0:
                index = size - 1
            else:
                index = index - 1

        self.selectitem(index)