python kivy boxlayout设置位置

Question

我正在使用此方法定位 BoxLayout

layout = BoxLayout(size_hint=(1, None), height=50, spacing=100, pos_hint={'y': 0.5 , 'top': 0.5})

但是它位于中间，我希望它位于 FloatLayout 的顶部中心。

运行时的代码也会给出此警告....

[CRITICAL          ] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute
[CRITICAL          ] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute
[CRITICAL          ] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute
[CRITICAL          ] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute
[CRITICAL          ] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute
[INFO              ] [Base        ] Leaving application in progress...

下面是代码:

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.widget import Widget
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)

    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()
        g = GridLayout(cols=5, rows=2, row_force_default=True, row_default_height=80)
        layout = BoxLayout(size_hint=(1, None), height=50, spacing=100, pos_hint={'y': 0.5 , 'top': 0.5})
        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)

        """
        label1 = ColoredLabel(text="jenkins output", pos_hint={'top': 1, 'right': .1}, size_hint=(None, None) , background_color=(160,160,160,.5))
        f.add_widget(label1)

        label2 = ColoredLabel(text="git output", pos_hint={'top': 1, 'right': .5}, size_hint=(None, None) , background_color=(160,160,160,.5))
        f.add_widget(label2)

        label3 = ColoredLabel(text="dev output", pos_hint={'top': 1, 'right': .8}, size_hint=(None, None) , background_color=(160,160,160,.5))
        f.add_widget(label3)
        """

        text1 = "jenkins"

        label1 = ColoredLabel(text=text1, background_color=(160,160,160,.5))
        layout.add_widget(label1)

        label2 = ColoredLabel(text="git", background_color=(160,160,160,.5))
        layout.add_widget(label2)

        label3 = ColoredLabel(text="portal", background_color=(160,160,160,.5))
        layout.add_widget(label3)

        f.add_widget(layout)


        return f

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

Answer 1

使用 pos_hint={'top': 1}。不要将 top 与 y 混在一起，这两者会相互冲突，因为它们都指的是垂直位置，这是您出错的原因。

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

kv = '''
<ColoredLabel>:
    size: (100,100)

    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()
        layout = BoxLayout(size_hint=(1, None), height=50, pos_hint={'top': 1})

        label1 = ColoredLabel(text="jenkins", background_color=(160,160,160,.5))
        layout.add_widget(label1)

        label2 = ColoredLabel(text="git", background_color=(160,160,160,.5))
        layout.add_widget(label2)

        label3 = ColoredLabel(text="portal", background_color=(160,160,160,.5))
        layout.add_widget(label3)

        f.add_widget(layout)


        return f

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

同时检查使用效果:

layout = BoxLayout(size_hint=(0.5, None), height=50, pos_hint={'top': 1})

和:

layout = BoxLayout(size_hint=(0.5, None), height=50, pos_hint={'top': 1, 'center_x':0.5})