Python / Kivy：使用enter键将一个TextInput聚焦到另一个TextInput

Question

1. 如何使用按回车键将焦点从name TextInput移动到动态添加行的第一列(id:test1)？
   
2. 按下输入动态second的{​​{1}}列（id：test2），然后添加新行。添加新行动态时如何聚焦每一行的第一列？

test.py

row

test.kv

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 300)

class User(Screen):

    def add_more(self):
        self.ids.rows.add_row()


class Row(BoxLayout):
    button_text = StringProperty("")


class Rows(BoxLayout):
    row_count = 0

    def __init__(self, **kwargs):
        super(Rows, self).__init__(**kwargs)
        self.add_row()

    def add_row(self):
        self.row_count += 1
        self.add_widget(Row(button_text=str(self.row_count)))


class Test(App):

    def build(self):
        return self.root


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

Answer 1

我添加了以下内容：

1. Clock.schedule_once以确保定义id并将焦点设置为名称（TextInput）。
2. ObjectProperty因为

  

通常认为使用ObjectProperty是“最佳实践”。   这样可以创建直接引用，提供更快的访问速度   明确的。

Programming Guide » Kv language » Referencing Widgets

实施例

main.py

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty, ObjectProperty
from kivy.clock import Clock

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 300)


class User(Screen):
    name = ObjectProperty(None)
    rows = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(User, self).__init__(**kwargs)
        Clock.schedule_once(self.set_name_focus, 1)

    def set_name_focus(self, *args):
        self.name.focus = True

    def on_enter_text_input(self):
        self.rows.row.test1.focus = True

    def add_more(self):
        self.rows.add_row()


class Row(BoxLayout):
    button_text = StringProperty("")


class Rows(BoxLayout):
    row_count = 0
    row = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(Rows, self).__init__(**kwargs)
        self.add_row()

    def add_row(self):
        self.row_count += 1
        self.row = Row(button_text=str(self.row_count))
        self.add_widget(self.row)


class Test(App):

    def build(self):
        return self.root


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

test.kv

#:kivy 1.10.0

<Button@Button>:
    font_size: 15
    font_name: 'Verdana'


<TextInput@TextInput>:
    font_size: 15
    font_name: 'Verdana'
    padding_y: 3


<Row>:
    test1: test1
    size_hint_y: None
    height: self.minimum_height
    height: 40

    Button:
        text: root.button_text
        size_hint_x: None
        top: 200

    TextInput:
        id:test1
        focus: True
        text: ' '
        width: 300
        multiline: False
        on_text_validate: test2.focus = True

    TextInput:
        id:test2
        text: ' '
        width: 300
        multiline: False
        on_text_validate: app.root.add_more()

<Rows>:
    size_hint_y: None
    height: self.minimum_height
    orientation: "vertical"

User:
    name: name
    rows: rows
    BoxLayout:
        orientation: "vertical"
        GridLayout:
            cols: 2
            padding: 20, 20
            spacing: 10, 10

            Label:
                text: "Name"
                text_size: self.size
                valign: 'middle'
            TextInput:
                id:name
                multiline: False
                text_size: self.size
                on_text_validate: root.on_enter_text_input()

        ScrollView:
            Rows:
                id: rows

输出