Kivy属性和不同小部件和布局类之间的通信

Question

下面我举了一个简单的例子。我有三个类MyLayout（root），Pop一个popup类和MyBox，MyBox是通过点击MyLayout中的按钮动态创建的Boxlayout。我在根目录中创建了capitalize（）函数，用于处理弹出字段。我的问题是与MyBox实例的交互。例如，弹出窗口如何知道哪个MyBox调用了它，并将名字+姓氏返回到相应的文本输入框中？你知道吗

另外，如果我想在所有MyBox实例中整理TextInput框中的所有数据，我会怎么做呢。我假设使用属性。你知道吗

提前谢谢

# filename popper.py
from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.stacklayout import StackLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder


Builder.load_string('''
#:import Factory kivy.factory.Factory
<MyBox>:
    orientation:'vertical'
    TextInput:
        text: 'N/A'
    Button:
        text: 'Choose a name'
        on_press: Factory.Pop().open()

<Pop>:
    auto_dismiss: False
    title: 'Names'
    size_hint: [0.4, 0.5]
    pos_hint:{'right': 0.4, 'top': 1}
    id: msg_box
    GridLayout:
        id: _pop
        rows: 3
        GridLayout:
            id: pop_grid
            cols:2
            padding: [0,5]
            Spinner:
                text: 'First Name'
                id: fn
                sync_height: True
                values: ['andrew', 'brian', 'colin', 'david', 'edmond']
                width: self.width
                on_text: self.text = app.root.capitalise(self.text)
            Spinner:
                text: 'Last Name'
                id: ln
                sync_height: True
                values: ['Adams', 'Bass', 'Carney', 'Davies', 'Edmonds']
                width: self.width


        Button:
            padding: [0,5]
            text: 'OK'
            on_release: root.dismiss()
            width: self.width

<MyLayout>:
    orientation: 'tb-lr'
    size_hint: .2, 0.5
    width: self.width
    Button:
        text: 'Create name box.'
        on_press: app.root.make_name_box()
        width: 300
''')



class MyLayout(StackLayout):
    pass

    def make_name_box(self):
        self.add_widget(MyBox())

    def capitalise(self, text):
        return text.capitalize()

class Pop(Popup):
    def __init__(self, **kwargs):
        super(Pop, self).__init__(**kwargs)

class MyBox(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBox, self).__init__(**kwargs)
        size_hint = None, None
        width = 300

class PopperApp(App):
    def build(self):
        return MyLayout()

if __name__ =='__main__':
    PopperApp().run()

Answer 1

您需要做的主要事情是将“creator”框的引用传递给“created”弹出窗口。您可以通过在创建时传递小部件来实现on_press: Factory.Pop(root).open()

完整工作代码如下：

Builder.load_string('''
#:import Factory kivy.factory.Factory
<MyBox>:
    orientation:'vertical'
    TextInput:
        text: root.box_text # bind the text to the box_text
    Button:
        text: 'Choose a name'
        on_press: Factory.Pop(root).open()  # pass the creator of the pop here

<Pop>:
    auto_dismiss: False
    title: 'Names'
    size_hint: [0.4, 0.5]
    pos_hint:{'right': 0.4, 'top': 1}
    id: msg_box
    GridLayout:
        id: _pop
        rows: 3
        GridLayout:
            id: pop_grid
            cols:2
            padding: [0,5]
            Spinner:
                text: 'First Name'
                id: fn
                sync_height: True
                values: ['andrew', 'brian', 'colin', 'david', 'edmond']
                width: self.width
                on_text: self.text = app.root.capitalise(self.text)
            Spinner:
                text: 'Last Name'
                id: ln
                sync_height: True
                values: ['Adams', 'Bass', 'Carney', 'Davies', 'Edmonds']
                width: self.width


        Button:
            padding: [0,5]
            text: 'OK'
            on_release:
                root.creator.box_text = "{} {}".format(fn.text, ln.text)  # use the creator reference
                root.dismiss()
            width: self.width

<MyLayout>:
    orientation: 'tb-lr'
    size_hint: .2, 0.5
    width: self.width
    Button:
        text: 'Create name box.'
        on_press: app.root.make_name_box()
        width: 300
''')


class MyLayout(StackLayout):
    pass

    def make_name_box(self):
        self.add_widget(MyBox())

    def capitalise(self, text):
        return text.capitalize()


class Pop(Popup):
    def __init__(self, creator, **kwargs):
        super(Pop, self).__init__(**kwargs)
        self.creator = creator # keep a reference to the creator here


class MyBox(BoxLayout):
    box_text = StringProperty("N/A")

    def __init__(self, **kwargs):
        super(MyBox, self).__init__(**kwargs)
        size_hint = None, None
        width = 300


class PopperApp(App):
    def build(self):
        self.my_layout = MyLayout()
        return self.my_layout

    def on_stop(self):  # print the names when leaving the app
        boxes = self.my_layout.children[:-1]
        print([i.box_text for i in boxes])


if __name__ == '__main__':
    PopperApp().run()

编辑：至于第二个问题，我添加了在你关闭应用程序时打印姓名的功能。你知道吗