kivy通过python动态添加自定义小部件到布局

Question

我能够让我的布局使用静态 kivy 语言，但我需要能够通过 python 将项目添加到我的列表中。我已经尝试了几件事，但似乎无法让任何东西正常工作。这是我静态工作的内容。

main.py

#!/usr/bin/python

import os
import kivy
kivy.require('1.8.0')

from kivy.app import App
from kivy.core.window import Window
from kivy.logger import Logger

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button

class CustomButton(Button):
    pass

    def click(button):
        Logger.info(button.title + ": wid=" + button.wid)


class SelectFruit(App, BoxLayout):
    icon = 'ico/fruit.png'
    title = 'Awesome Fruit Picker'

    def build(self):
        Window.size = 400, (4 * 78)     
        return SelectFruit()

if __name__ in ('__main__'):
    SelectFruit().run()

选择水果.kv

#:kivy 1.8.0

<CustomButton@Button>:
    wid: ""
    image: ''
    title: ''
    label: ''
    on_press: self.click()
    BoxLayout:
        orientation: "horizontal"
        size: self.parent.size      # match the button's size
        pos: self.parent.pos        # match the button's position
        padding: 5   
        spacing: 10

        Image:
            size_hint: None, 1
            source: root.image
            size: 64, 64
            valign: "middle"


        Label:
            size_hint: None, 1
            text: root.label
            valign: "middle"
            size: 400, 64
            text_size: self.size


<SelectFruit>
    orientation: "vertical"
    padding: 2

    CustomButton:
        wid: "0"
        image: "ico/apple.png"
        title: "apple"
        label: "Apple: Super Sweet\nPicked On: 12/26/2014, 2:01 PM"

    CustomButton:
        wid: "1"
        image: "ico/banana.png"
        title: "banana"
        label: "Banana: Want a bunch?\nPicked On: 2/18/2014, 2:01 PM"

    CustomButton:
        wid: "2"
        image: "ico/strawberry.png"
        title: "strawberry"
        label: "Strawberry: Yummy Yummy\nPicked On: 5/6/2014, 2:01 PM"

    CustomButton:
        wid: "3"
        image: "ico/orange.png"
        title: "orange"
        label: "Orange: Florida's Best\nPicked On: 4/21/2014, 2:01 PM"

我只需要能够以编程方式将每个 CustomButton 添加到我的布局中，而不是通过 kivy 语言文件。 非常感谢任何帮助。

Answer 1

这里的工作代码显示了一些以 kivy 语言添加的项目，然后以编程方式添加了一些附加项目。我还添加了 ScrollView，这是一个配置设置以防止窗口被调整大小和代码以突出显示选定的项目。

我希望这对将来的某人有所帮助。 :)

main.py

#!/usr/bin/python

from kivy.config import Config
Config.set('graphics','resizable',0)

import kivy
kivy.require('1.8.0')

from kivy.app import App
from kivy.core.window import Window
from kivy.properties import ObjectProperty, StringProperty
from kivy.logger import Logger

from kivy.uix.scrollview import ScrollView
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button


class ButtonListItem(Button):
    wid = StringProperty('')
    image = StringProperty('')
    title = StringProperty('')
    label = StringProperty('')
    pass

    def click(button):
        global app
        app.clearSelection()
        button.background_color = (0,160,66,.9)
        Logger.info(button.title + ": wid=" + button.wid)

class ButtonList(GridLayout):
    pass

class SelectFruit(App):
    icon = 'ico/fruit.png'
    title = 'Awesome Fruit Picker'

    def build(self):
        Window.size = 400, (4 * 90)

        self.layout = ButtonList()
        self.layout.size = 400, (8 * 78)

        self.root = ScrollView(
                        size_hint=(None, None), 
                        size=Window.size,
                        scroll_type=['bars', 'content']
                    )
        self.root.add_widget(self.layout)

        ib = ButtonListItem(
                wid="0", 
                image="ico/apple.png", 
                title="apple", 
                label="Apple: Super Sweet\nPicked On: 12/26/2014, 2:01 PM"
            )
        self.layout.add_widget(ib)

        ib = ButtonListItem(
                wid="1", 
                image="ico/banana.png", 
                title="banana", 
                label="Banana: Want a bunch?\nPicked On: 2/18/2014, 2:01 PM"
            )
        self.layout.add_widget(ib)

        ib = ButtonListItem(
                wid="2", 
                image="ico/strawberry.png", 
                title="strawberry", 
                label="Strawberry: Yummy Yummy\nPicked On: 5/6/2014, 2:01 PM"
            )
        self.layout.add_widget(ib)

        ib = ButtonListItem(
                wid="3", 
                image="ico/orange.png", 
                title="orange", 
                label="Orange: Florida's Best\nPicked On: 4/21/2014, 2:01 PM"
            )
        self.layout.add_widget(ib)

        return self.root

    def clearSelection(self):
        for child in self.layout.children:
            child.background_color = (1,1,1,1)

if __name__ == "__main__":
    app = SelectFruit()
    app.run()

选择水果.kv

#:kivy 1.8.0

<ButtonListItem@Button>:
    wid: self.wid
    image: self.image
    title: self.title
    label: self.label
    on_press: self.click()
    BoxLayout:
        orientation: "horizontal"
        size: self.parent.size      # match the button's size
        pos: self.parent.pos        # match the button's position
        padding: 5   
        spacing: 10

        Image:
            size_hint: None, 1
            source: root.image
            size: 64, 64
            valign: "middle"


        Label:
            size_hint: None, 1
            text: root.label
            valign: "middle"
            size: 400, 64
            text_size: self.size


<ButtonList@GridLayout>
    id: output
    cols: 1
    size_hint_y: None
    height: self.minimum_height

    ButtonListItem:
        wid: "0"
        image: "ico/apple.png"
        title: "xapple"
        label: "Apple: Super Sweet\nPicked On: 12/26/2014, 2:01 PM"

    ButtonListItem:
        wid: "1"
        image: "ico/banana.png"
        title: "xbanana"
        label: "Banana: Want a bunch?\nPicked On: 2/18/2014, 2:01 PM"

    ButtonListItem:
        wid: "2"
        image: "ico/strawberry.png"
        title: "xstrawberry"
        label: "Strawberry: Yummy Yummy\nPicked On: 5/6/2014, 2:01 PM"

    ButtonListItem:
        wid: "3"
        image: "ico/orange.png"
        title: "xorange"
        label: "Orange: Florida's Best\nPicked On: 4/21/2014, 2:01 PM"

Answer 2

def click(button):

调用方法self的第一个参数是正常的，引用其方法被调用的实例。

class SelectFruit(App, BoxLayout):

这似乎是一个灾难的秘诀，没有必要让应用程序也成为一个小部件，它有可能出现奇怪的错误，因为这意味着你将同时运行两个应用程序。您应该将其分成单独的小部件和应用程序类。

我需要能够通过 python 将项目添加到我的列表中

我不清楚这到底是哪一部分是问题，但您应该能够使用App.get_running_app().root.add_widget(your_widget) 添加到（例如）根小部件，其中your_widget 是例如CustomButton 的新实例.