Setting global font size in kivy

问题

What is the preferred way, whether through python or the kivy language, to set the global font size (i.e. for Buttons and Labels) in kivy?

What is a good way to dynamically change the global font size setting in proportion to the size of the window?

回答1:

Use a template to create your custom Label:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.widget import Widget 
from kivy.properties import ObjectProperty, NumericProperty

kv = '''
[MyLabel@Label]:
    text: ctx.text if hasattr(ctx, 'text') else ''
    font_size: 24
    markup: True

<MyWidget>:
    id: f_wid
    BoxLayout:
        size: f_wid.size
        orientation: 'vertical'
        MyLabel:
            text: "Hello world 1"
        MyLabel:
            text: "Hello world 2"
        MyLabel:
            text: "Hello world 3"
        MyLabel:
            text: "Hello world 4"   
        MyLabel:
            text: "Hello world 1"
        MyLabel:
            text: "Hello world 2"
        MyLabel:
            text: "Hello world 3"
        MyLabel:
            text: "Hello world 4"   
'''
Builder.load_string(kv)

import kivy
kivy.require('1.7.1') # replace with your current kivy version !

from kivy.app import App
from kivy.uix.widget import Widget

class MyWidget(Widget):
    pass

class MyApp(App):
    def build(self):
        return MyWidget()

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

To have font size depended on screen size, instead of using fixed values calculate it using self.heigh:

[MyLabel@Label]:
    text: ctx.text if hasattr(ctx, 'text') else ''
    font_size: self.height/2
    markup: True

UPDATE

Alternative approach is setting variable using #:set syntax:

kv = '''
#:set default_font_size "36sp"
<MyWidget>:
    id: f_wid
    BoxLayout:
        size: f_wid.size
        orientation: 'vertical'
        Label:
            text: "Hello world 1"
            font_size: default_font_size
        Label:
            text: "Hello world 2"
            font_size: default_font_size
        Label:
            text: "Hello world 3"
            font_size: default_font_size
        Label:
            text: "Hello world 4"   
            font_size: default_font_size
        Label:
            text: "Hello world 1"
            font_size: default_font_size
        Label:
            text: "Hello world 2"
            font_size: default_font_size
        Label:
            text: "Hello world 3"
            font_size: default_font_size
        Label:
            text: "Hello world 4"   
            font_size: default_font_size
'''
Builder.load_string(kv)

回答2:

<Label>:
    font_size: dp(20)
    font_name: 'path/to/funcy/font.ttf'

Will set the font name and the font size globally for any widget that uses Label as it's base(TextInput and a few other widgets don't).

回答3:

I know this question is old but you did ask about "dynamically change the global font size setting in proportion to the size of the window"

For a similar problem I've created AutoSizedLabel

class TestApp(App):
    def build(self):
        return AutoSizedLabel(text="crazy stuff", ratio=0.5)

It is pip install-able by :

pip install kivyoav

来源：https://stackoverflow.com/questions/19052905/setting-global-font-size-in-kivy

标签

python

properties

kivy

font-size