如何在循环中加上整数值

Question

我有两个文件demo.py 和demo.kv。有人可以帮我吗？

1。 +Add More 添加动态行。当我点击Total Value 填充值后，它会显示类似151012 的字符串。不显示12+10+15=37。我正在使用它的代码

        test = ''
        for val in values:
            test = val[2]+test

        self.total_value.text = test

2。谁能告诉我如何在填充value TextBox 后将值的总和放入Total value TextBox，而不是点击Total Value Box.Means 如何从value TextBox 调用def test(self) 函数？

demo.py

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 BooleanProperty, ListProperty, StringProperty, ObjectProperty, NumericProperty
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 400)

class User(Screen):
    total_value = ObjectProperty(None)

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

    def test(self):
        values = []
        rows = self.ids.rows

        for row in reversed(rows.children):
            vals = []
            for ch in reversed(row.children):
                if isinstance(ch, TextInput):
                    vals.append(ch.text)
                if isinstance(ch, Button):
                    vals.insert(0, ch.text)
            values.append(vals)

        test = ''
        for val in values:
            test = val[2]+test

        self.total_value.text = test

class Row(BoxLayout):
    col_data = ListProperty(["?", "?", "?", "?", "?"])
    button_text = StringProperty("")
    col_data3 = StringProperty("")
    col_data4 = StringProperty("")

    def __init__(self, **kwargs):
        super(Row, self).__init__(**kwargs)



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):
        self.root = Builder.load_file('demo.kv')
        return self.root


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

demo.kv

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

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

    TextInput:
        text: root.col_data3
        width: 300
    TextInput:
        text: root.col_data4
        width: 300


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

User:
    total_value:total_value
    BoxLayout:
        orientation: "vertical"
        padding : 20, 5


        BoxLayout:
            orientation: "horizontal"
            #padding : 10, 10
            spacing: 10, 10
            size: 450, 40
            size_hint: None, None

            Label:
                size_hint_x: .2
                text: "Number"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'

            Label:
                size_hint_x: .4
                text: "name"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'

            Label:
                size_hint_x: .4
                text: "Value"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'




        ScrollView:
            Rows:
                id: rows

        BoxLayout:
            orientation: "horizontal"
            padding : 10, 5
            spacing: 10, 10
            size: 200, 40
            size_hint: None, None

            Label:
                size_hint_x: .7
                text: "Total value"

            TextInput:
                id: total_value
                on_focus:root.test()



        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .2
            size_hint_y: .2

            Button:
                text: "+Add More"
                on_press: root.add_more()

如果可以的话，这将是一个很大的帮助。

Answer 1

要以简单的方式访问元素，您必须设置 id，在这种情况下，我将为与数字输入关联的 TextInput 设置一个，您还必须放置一个过滤器以仅接受数值：

TextInput:
    id: number_input
    text: root.col_data4
    width: 300
    input_filter: 'int'

那么test()方法就简化为如下：

class User(Screen):
    total_value = ObjectProperty(None)
    def add_more(self):
        self.ids.rows.add_row()

    def test(self):
        rows = self.ids.rows
        total = 0
        for row in rows.children:
            text = row.ids.number_input.text
            total += int(text) if text != "" else 0 # validate if the entry is not empty
        self.total_value.text = str(total)

为了能够自动更新值，我们将文本更改链接到一个函数，并在其中调用test()，为了访问测试，我们必须在 Screen 中放置一个 id：

User:
    id: user
    total_value: total_value
    [...]

能够从App.get_running_app()访问屏幕：

class Row(BoxLayout):
    button_text = StringProperty("")
    col_data3 = StringProperty("")
    col_data4 = StringProperty("")
    def __init__(self, *args, **kwargs):
        super(Row, self).__init__(*args, **kwargs)
        self.ids.number_input.bind(text=self.on_text)

    def on_text(self, text_input, value):
        App.get_running_app().root.test()

完整代码：

demo.py

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 BooleanProperty, ListProperty, StringProperty, ObjectProperty, NumericProperty
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 400)

class User(Screen):
    total_value = ObjectProperty(None)
    def add_more(self):
        self.ids.rows.add_row()

    def test(self):
        rows = self.ids.rows
        total = 0
        for row in rows.children:
            text = row.ids.number_input.text
            total += int(text) if text != "" else 0
        self.total_value.text = str(total)

class Row(BoxLayout):
    button_text = StringProperty("")
    col_data3 = StringProperty("")
    col_data4 = StringProperty("")
    def __init__(self, *args, **kwargs):
        super(Row, self).__init__(*args, **kwargs)
        self.ids.number_input.bind(text=self.on_text)

    def on_text(self, text_input, value):
        App.get_running_app().root.test()

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):
        self.root = Builder.load_file('demo.kv')
        return self.root


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

demo.kv

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

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

    TextInput:
        text: root.col_data3
        width: 300

    TextInput:
        id: number_input
        text: root.col_data4
        width: 300
        input_filter: 'int'

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

User:
    id: user
    total_value: total_value
    BoxLayout:
        orientation: "vertical"
        padding : 20, 5

        BoxLayout:
            orientation: "horizontal"
            #padding : 10, 10
            spacing: 10, 10
            size: 450, 40
            size_hint: None, None

            Label:
                size_hint_x: .2
                text: "Number"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'

            Label:
                size_hint_x: .4
                text: "name"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'

            Label:
                size_hint_x: .4
                text: "Value"
                text_size: self.size
                valign: 'bottom'
                halign: 'center'


        ScrollView:
            Rows:
                id: rows

        BoxLayout:
            orientation: "horizontal"
            padding : 10, 5
            spacing: 10, 10
            size: 200, 40
            size_hint: None, None

            Label:
                size_hint_x: .7
                text: "Total value"

            TextInput:
                id: total_value
                on_focus:root.test()



        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .2
            size_hint_y: .2

            Button:
                text: "+Add More"
                on_press: root.add_more()

Answer 2

1. 试试：

   test = 0
   for val in values:
       test = int(val[2])+test
   
   self.total_value.text = str(test)
   

2. 在你的 .kv 文件中试试这个：

       TextInput:
           id: total_value
           text: root.test()
   

   如果它不起作用，您可以随时使用Kivy Clock 定期调用您的函数。