python - python kivy在矩形内添加文本

如何在矩形内添加文本？我正在使用下面的代码，并在 Canvas 内添加了一个标签，希望它可以显示在矩形内。

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *

class MyApp(App):
    def build(self):
        r = AnchorLayout()
        f = RelativeLayout()
        g = GridLayout(cols=3, rows=5)
        v = Video(source='driver.mp4', state='play', options={'eos':'loop'})
        l1 = Label(text="jenkins", font_size=32)
        l2 = Label(text="git", font_size=32)
        f.add_widget(v)
        f.add_widget(g)
        g.add_widget(l1)
        g.add_widget(l2)
        with g.canvas:
            Color(.4, .1, .1)
            Rectangle(pos=(100,10), size=(100,100))
            Label(text="KSHK")
        return f

if __name__ == "__main__":
    MyApp().run()

更新:
这不会使ColoredLabel中心的文本对齐

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from random import random
from kivy.properties import ListProperty


kv = '''
<ColoredLabel>:
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: (10,10)
            size: (100,100)
    '''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0,0,0,1))

class MyApp(App):
    def build(self):
        f = AnchorLayout()
        g = GridLayout(cols=2, rows=2)
        layout = BoxLayout(size_hint=(1, None), height=50)
        v = Video(source='driver.mp4', state='play', options={'eos':'loop'})
        l1 = Label(text="jenkins", font_size=32)
        l2 = Label(text="git", font_size=32)
        f.add_widget(v)


        label = ColoredLabel(text="Hello World!", background_color=(random(), random(), random(), 1))
        g.add_widget(label)


        f.add_widget(g)

        return f

if __name__ == "__main__":
    MyApp().run()

最佳答案

使用具有自定义背景色的Label，然后将其放置在布局中。例如:

from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ListProperty
from kivy.app import App
from kivy.lang import Builder

from random import random

kv = '''
<ColoredLabel>:
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
'''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0, 0, 0, 1))

class TestApp(App):
    def build(self):
        layout = BoxLayout(size_hint=(1, None), height=50)
        for label in ('a', 'b', 'c', 'd'):
            label = ColoredLabel(text=label, background_color=(random(), random(), random(), 1))
            layout.add_widget(label)

        return layout

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

更新

解决OP中的问题:

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from random import random
from kivy.properties import ListProperty


kv = '''
<ColoredLabel>:
    size: (100,100)
    pos: (10,10) # no effect
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
    '''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0,0,0,1))

class MyApp(App):
    def build(self):
        f = AnchorLayout()
        g = GridLayout(cols=2, rows=2)
        layout = BoxLayout(size_hint=(1, None), height=50)
#        v = Video(source='driver.mp4', state='play', options={'eos':'loop'})
        l1 = Label(text="jenkins", font_size=32)
        l2 = Label(text="git", font_size=32)
#        f.add_widget(v)

        label = ColoredLabel(text="Hello World!", size_hint=(None, None), background_color=(random(), random(), random(), 1))
        g.add_widget(label)

        f.add_widget(g)

        return f

if __name__ == "__main__":
    MyApp().run()

请注意，Rectange的ColoredLabel需要具有pos: self.pos和size: self.size才能在标签实际所在的位置绘制。这就是为什么我在上述级别中更改了Label本身的大小。 Canvas 大小已绑定(bind)到它。至于位置，它由放置ColoredLabel的Layout控制，因此从ColoredLabel类进行更改不会有太大变化。与FloatLayout进行比较:

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from random import random
from kivy.properties import ListProperty

from kivy.uix.floatlayout import FloatLayout


kv = '''
<ColoredLabel>:
    size: (150, 200)
    pos: (50, 150)
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
    '''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0,0,0,1))

class MyApp(App):
    def build(self):
        f = FloatLayout()
        label = ColoredLabel(text="Hello World!", size_hint=(None, None), background_color=(random(), random(), random(), 1))
        f.add_widget(label)

        return f

if __name__ == "__main__":
    MyApp().run()

在这种情况下，更改ColoredLabel内部的pos实际上会产生影响。