Question

我有2个班级（一个班级包含会议列表，另一个班级包含该特定会议中的出席者列表）。

我创建了第一个列表视图，该列表视图显示了会议列表。

我想基于对第一个列表视图（会议）的点击来提供第二个列表视图（与会者）。

目前，我无法调用find_attendant_meeting（）。

当我使用：

调用此函数时

1）

<MeetingListButton>:
    on_press: root.find_attendant_meeting()

我无权访问{attendance_list}对象。

class MeetingListButton(ListItemButton):

    def find_attendant_meeting(self):
        selected_meeting = int(self.proxy_ref.text[-1])
        sql_attendance_meeting = cur.execute("""SELECT name FROM users WHERE id IN (SELECT user_meeting.id_user from meeting join user_meeting on user_meeting.id_meeting = meeting.id where meeting.id='%s')""" % selected_meeting)
        res = ['Attendant Name: ' + str(t[0]) for t in sql_attendance_meeting]
        print(res)
        return res


class AttendanceListButton(ListItemButton):
    pass


class MeetingDB(BoxLayout):

    meeting_list = ObjectProperty()
    attendance_list = ObjectProperty()


class FaceApp(App):
    r = ['Meeting Number ' + str(t[0]) for t in sql_meeting_list]
    def build(self):
        return MeetingDB()

KV文件：

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

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

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

    <MeetingListButton>:
        on_press: root.find_attendant_meeting()

Answer 1

一种简单的方法是在App.get_running_app方法内使用find_attendant_meeting方法，以ListView为id来访问attendance_view小部件。

def find_attendant_meeting(self):
    selected_meeting = int(self.proxy_ref.text[-1])
    sql_attendance_meeting = cur.execute("""SELECT name FROM users WHERE id IN (SELECT user_meeting.id_user from meeting join user_meeting on user_meeting.id_meeting = meeting.id where meeting.id='%s')""" % selected_meeting)
    res = ['Attendant Name: ' + str(t[0]) for t in sql_attendance_meeting]

    App.get_running_app().root.ids.attendance_view.adapter.data = res

Here's the output.

由于正在查询数据库，因此您可能希望在另一个线程上进行查询，以使gui不会冻结。

另一种方法是在MessageListButton小部件上创建一个对象。

class MeetingListButton(ListItemButton):
    someRoot = ObjectProperty()

然后您可以在kv文件中设置该对象的值，如下所示：

<MeetingListButton>:
    someRoot: app.root
    on_press: root.find_attendant_meeting()

然后在您的find_attendant_meeting方法上，您可以执行以下操作：

def find_attendant_meeting(self):
    selected_meeting = int(self.proxy_ref.text[-1])
    #sql_attendance_meeting = cur.execute("""SELECT name FROM users WHERE id IN (SELECT user_meeting.id_user from meeting join user_meeting on user_meeting.id_meeting = meeting.id where meeting.id='%s')""" % selected_meeting)
    #res = ['Attendant Name: ' + str(t[0]) for t in sql_attendance_meeting]


    dummyData = {0: ["Aaa", "Bbb", "Ccc"], 1: ["Ddd", "Eee", "Fff"], 2: ["Ggg", "Hhh", "Iii"]}
    sql_attendance_meeting = dummyData[selected_meeting]

    self.someRoot.ids.attendance_view.adapter.data = sql_attendance_meeting

这是完整的代码：

main.py

from kivy.adapters.listadapter import ListAdapter
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.listview import ListView, ListItemButton
from kivy.properties import ObjectProperty


class MeetingListButton(ListItemButton):
    someRoot = ObjectProperty()

    def find_attendant_meeting(self):
        selected_meeting = int(self.proxy_ref.text[-1])
        #sql_attendance_meeting = cur.execute("""SELECT name FROM users WHERE id IN (SELECT user_meeting.id_user from meeting join user_meeting on user_meeting.id_meeting = meeting.id where meeting.id='%s')""" % selected_meeting)
        #res = ['Attendant Name: ' + str(t[0]) for t in sql_attendance_meeting]


        dummyData = {0: ["Aaa", "Bbb", "Ccc"], 1: ["Ddd", "Eee", "Fff"], 2: ["Ggg", "Hhh", "Iii"]}
        sql_attendance_meeting = dummyData[selected_meeting]

        self.someRoot.ids.attendance_view.adapter.data = sql_attendance_meeting


class AttendanceListButton(ListItemButton):
    pass


class MeetingDB(BoxLayout):

    meeting_list = ObjectProperty()
    attendance_list = ObjectProperty()

class FaceApp(App):
    r = ["Meeting Number " + str(t) for t in range(3)]

    def build(self):
        return MeetingDB()

FaceApp().run()

face.kv

#:import ListAdapter kivy.adapters.listadapter.ListAdapter
#:import main main


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

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

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

<MeetingListButton>:
    someRoot: app.root
    on_press: root.find_attendant_meeting()

Kivy feed listview基于另一个列表视图的单击按钮

1 个答案: