Question

What I want to know?

If button with id: button_b (Get_Boys class) is released, then Label with id: label_g (Get_Girls class) must change.
If Button with id: button_b (Get_Boys class) is pressed, then Label with id: root_lbl (Get_People class) must change.
If Button with id: root_btn (Get_People class) is released, then Label with id: label_b (Get_Boys class) must change.

It is explained (little) in this link, but not from the beginner's point of view.

I have 2 files

test.py
dates_test.kv

test.py

#PersSchemaTable td:nth-child(1),
#PersSchemaTable td:nth-child(3), 
#PersSchemaTable td:nth-child(5), 
#PersSchemaTable td:nth-child(7), 
#PersSchemaTable td:nth-child(9), 
#PersSchemaTable td:nth-child(11),
#PersSchemaTable td:nth-child(13) {
    border-right: 2px solid #781351;
}

dates_test.kv file

class Get_People(BoxLayout):
    pass

class Get_Boys(BoxLayout):
    pass

class Get_Girls(BoxLayout):
    pass

class TestApp(App):
    def build(self):
        self.load_kv('dates_test.kv')
        return Get_People()

Answer 1

嗯！看起来我自己找到了答案，我想分享一下。

首先让我们在dates_test.kv文件中给出“id”。这样您就可以在python代码或.kv文件中访问它们。

<Get_People>:
    stuff_p: root_lbl
    ...
    Get_Boys:
        id: gb
    Get_Girls:
        id: gg

<Get_Boys>:
    stuff_b: label_b

<Get_Girls>:
    stuff_c: label_g

你可能想知道什么是stuff_p，stuff_b和stuff_c ???

它们是在自己的类中定义的ObjectProperty。您在python代码中的stuff_b中所做的更改会在label_b中进行更改，因为您已在kivy文件中进行了链接。

class Get_People(BoxLayout):
    stuff_p = ObjectProperty(None)
    ...

class Get_Boys(BoxLayout):
    stuff_b = ObjectProperty(None)
    ...

class Get_Girls(BoxLayout):
    stuff_c = ObjectProperty(None)
    ...

对于第1部分和第2部分

如果释放了带有id：button_b（Get_Boys类）的按钮，则为Label   id：label_g（Get_Girls类）必须更改。



如果按下具有id：button_b（Get_Boys类）的Button，则为Label   id：root_lbl（Get_People类）必须更改。

在Get_Boys类（test.py）中定义这些方法。

def change_girl(self):

    self.parent.ids.gg.stuff_c.text = "Boys changed Girls!"
    #self.stuff_b.text = "i changed myself!"

def change_people(self):
    self.parent.ids.root_lbl.text = "Boys changed people!"

让我们看看这里发生了什么......

self.parent.ids.gg.stuff_c.text =“男孩改变了女孩！”

self.parent指的是Get_Parent类。
.ids.gg是指我们为Get_Girls创建的ID。
.stuff_c用于在Get_Girls类中引用label_g（上面）。
.text用于更改标签中的文字。

并在.kv文件中

<Get_Boys>:
    stuff_b: label_b
    Button:
        id: button_b
        text: "button 1"
        on_release: root.change_girl()
        on_press: root. change_people()

第3部分

如果释放了具有id：root_btn（Get_People类）的Button，则为Label   id：label_b（Get_Boys类）必须更改。

在Get_People类（test.py）中定义一个方法。

def rooted(self):
    self.ids.gb.stuff_b.text = "people changed boys!"

和.kv文件

Button:
    id: root_btn
    text: "I am Root"
    on_release: root.rooted()

How to access id/widget of different class from a kivy file (.kv)?

1 个答案: