Question

我目前在我的python gui中使用了一个Spinbox，它是通过使用Tkinter实现的。设置Spinbox的方法就是这个：

def _select_event(self, type, id):
        """ Selects an event for editing its properties """
        print("_select_event")
        if not self._can_draw(): return
        if type != self.event_type:
            #Destroy all widgets on the frame and build those neccessary
            for widget in self.event_edit_widgets: widget.grid_remove()
            self.event_edit_widgets = []
            self.event_type = type
            if self.event_type == "Person": #Build widgets for person
                if len(self.map.persons) <= id: return
                print("mark0")
                self.event_edit_widget_id_spinbox = tkinter.Spinbox(self.event_edit_widget, from_=0, to=len(self.map.persons) - 1, command=self._select_event(self.event_type, self.event_edit_type_dropdown.get()))
                print("mark1")
            elif self.event_type == "Warp": #Build widgets for warp
                if len(self.map.warps) <= id: return
                self.event_edit_widget_id_spinbox = tkinter.Spinbox(self.event_edit_widget, from_=0, to=len(self.map.warps) - 1, command=self._select_event(self.event_type, self.event_edit_type_dropdown.get()))
            elif self.event_type == "Trigger": #Build widgets for trigger
                if len(self.map.triggers) <= id: return
                self.event_edit_widget_id_spinbox = tkinter.Spinbox(self.event_edit_widget, from_=0, to=len(self.map.triggers) - 1, command=self._select_event(self.event_type, self.event_edit_type_dropdown.get()))
            elif self.event_type == "Sign": #Build widgets for sign
                if len(self.map.signposts) <= id: return
                self.event_edit_widget_id_spinbox = tkinter.Spinbox(self.event_edit_widget, from_=0, to=len(self.map.signposts) - 1, command=self._select_event(self.event_type, self.event_edit_type_dropdown.get()))
            else: 
                raise Exception("Unkown event type selected: " + self.event_type)
            #Push all common widgets to the ui
            self.event_edit_widget_id_spinbox.grid(row=1, column=0, sticky=tkinter.NW)
            self.event_edit_widget_id_spinbox.config(state="readonly")
            self.event_edit_widgets.append(self.event_edit_widget_id_spinbox)
        #Update all widgets
        self.event_edit_widget_id_spinbox.delete(0, tkinter.END)
        self.event_edit_widget_id_spinbox.insert(0, str(id))

正如您可以看到为例如设置的Spinbox self.event_type ==＆＃34; Person＆＃34;将setup方法本身与命令相关联（这意味着，当您更改spinbox中的值时，它可能会设置一个新的 - 没有任何东西可用）。但是我发现，spinbox的构造函数会自动触发命令函数本身。意味着输出将是：

＆＃34; _select_event，mark0，_select_event＆＃34; （mark0不再被触发，因为if条件现在不再是真的，因此幸运地预测无限递归）。

当然

self.event_edit_widget_id_spinbox.delete（0，tkinter.END）不起作用，并在_select_event的第二次调用中引发异常，这是由旋转框的构造函数触发的。如何防止此构造函数在安装时触发命令？

Python tkinter spinbox命令是imideatly

0 个答案: