Kivy Popup 确认删除列表视图项

Question

如果用户单击删除会议按钮，我想从列表视图中删除一个项目。

在这种情况下，将出现一个弹出窗口，要求确认删除会议。

一切正常，但当用户单击“是”按钮（以确认删除会议）时，我未能从列表视图中删除会议。

我想为“是”按钮写信：

on_press : self.meeting_list.adapter.data.remove(selection) and self.meeting_list._trigger_reset_populate()

class MeetingDB(BoxLayout):
    meeting_list = ObjectProperty()
    attendance_list = ObjectProperty()

    def delete_meeting(self):
        if self.meeting_list.adapter.selection:
            selection = self.meeting_list.adapter.selection[0].text

            self.box_popup = BoxLayout(orientation = 'horizontal')
            self.box_popup.add_widget(Label(text = "Confirm the deletion of the meeting ?"))

            self.box_popup.add_widget(Button(
                text = "Yes",
                on_press = App.get_running_app().root.ids.meeting_list.adapter.data.remove(selection),
                size_hint = (0.215, 0.075)))

            self.box_popup.add_widget(Button(
                text = "No",
                on_press = lambda *args: self.popup_exit.dismiss(),
                size_hint=(0.215, 0.075)))

            self.popup_exit = Popup(title = "Delete Meeting Confirmation",
                content = self.box_popup,
                size_hint = (0.4, 0.4),
                auto_dismiss = True)

            self.popup_exit.open()

            #self.meeting_list.adapter.data.remove(selection)
            #self.meeting_list._trigger_reset_populate()

Kv 文件：

<MeetingDB>:
    orientation:'vertical'
    meeting_list: meeting_view
    attendance_list: attendance_view

    BoxLayout:
        size_hint_y: None
        height: "40dp"

        Button:
            text: 'Add meeting'
            size_hint_x: 20
            on_press: root.add_meeting()
        Button:
            text: 'Delete Meeting'
            size_hint_x: 20
            on_press: root.delete_meeting()

    ListView:
        id: meeting_view
        adapter:
            ListAdapter(data = app.r, cls = main.MeetingListButton)

    ListView:
        id: attendance_view
        adapter:
            ListAdapter(data = [], cls = main.AttendanceListButton, selection_mode = 'multiple')

Answer 1

第一个问题是您将 remove() 的执行存储为 on_press 的绑定函数，而不是函数 remove.

因此，执行以下操作会更有意义：

on_press = App.get_running_app().root.ids.meeting_list.adapter.data.remove

但我会将调用转换为用户创建的函数，以便您可以更好地控制所发生的事情，方法如下：

class MeetingDB(BoxLayout):
    meeting_list = ObjectProperty()

    def remove_thing(self, event):
        selection = self.meeting_list.adapter.selection[0].text
        App.get_running_app().root.ids.meeting_list.adapter.data.remove(selection),

    def delete_meeting(self):
        if self.meeting_list.adapter.selection:
            self.box_popup = BoxLayout(orientation = 'horizontal')
            self.box_popup.add_widget(Label(text = "Confirm the deletion of the meeting ?"))

            self.box_popup.add_widget(Button(
                text = "Yes",
                on_press = self.remove_thing
                size_hint = (0.215, 0.075))
            )

            self.popup_exit.open()

现在，我没有安装 Kivy，我无法测试这段代码。
如果它不完美，我们深表歉意，但你应该明白了。

Kivy Popup 确认删除列表视图项

Kivy Popup confirmation to delete listview item

python

popup

kivy