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如何在kivy中使用弹出式滑块更改字体大小?

python-3.5 kivy slider popup

user8694101 · 技术社区 · 7 年前

嗨,这是我的简单RSTDocument编辑器代码。我正在尝试使用弹出窗口中的滑块更改RSTdocument的基本字体大小。我该怎么做??我试过使用 slider_id.value 但它没有起作用。

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup

Builder.load_string('''
<RST_GUI>:

    padding: 5
    spacing: 2
    orientation: 'vertical'

    BoxLayout:
        size_hint: (.5, .1)
        pos_hint: {'center_x': .5, 'center_y': 0.5}
        Button:
            text: 'Font Size'
            on_press: root.font_size()
    BoxLayout:
        TextInput:
            id: textinput
            tab_width: 5
        Splitter:
            sizeable_from: 'right'
            min_size: '5'
            RstDocument:
                show_errors: True
                base_font_size: #slider_id.value or something possible?
                text: textinput.text

<font_size>:

    size_hint: (.5, .3)
    pos_hint: {'center_x': .5, 'center_y': 0.5}
    title: "  Font size: " + str(slider_id.value)
    Slider:
        min: 20
        max: 50
        value:31
        step: 1
        id: slider_id


''')


class RST_GUI(BoxLayout):

    def font_size(self):
        font_size().open()    

class font_size(Popup):
    pass

class RST(App):
    def build(self):
        return RST_GUI()

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

1 回复 | 直到 7 年前

FJSevilla 7 年前

id的作用域仅限于它在其中声明的规则,因此,您不能 base_font_size: slider_id.value . 有几种方法可以实现您的目标,一种可能是在 RST_GUI 类的实例,并使用 NumericProperty 设置字体大小:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
from kivy.properties import NumericProperty


Builder.load_string('''
<RST_GUI>:
    font_size: 31
    padding: 5
    spacing: 2
    orientation: 'vertical'

    BoxLayout:
        size_hint: (.5, .1)
        pos_hint: {'center_x': .5, 'center_y': 0.5}
        Button:
            text: 'Font Size'
            on_press: root.open_font_popup()

    BoxLayout:
        TextInput:
            id: textinput
            tab_width: 5

        Splitter:
            sizeable_from: 'right'
            min_size: '5'
            RstDocument:
                show_errors: True
                base_font_size: root.font_size
                text: textinput.text

<FontSizePopup>:
    font_size: slider_id.value
    size_hint: (.5, .3)
    pos_hint: {'center_x': .5, 'center_y': 0.5}
    title: "  Font size: " + str(slider_id.value)
    Slider:
        min: 20
        max: 50
        value:31
        step: 1
        id: slider_id
''')


class RST_GUI(BoxLayout):
    font_size = NumericProperty()

    def __init__(self, **kwargs):
        super(RST_GUI, self).__init__(**kwargs)
        self.font_popup = FontSizePopup()
        self.font_popup.bind(font_size=self.change_font_size)

    def open_font_popup(self):
        self.font_popup.open()

    def change_font_size(self, instance, value):
        self.font_size = value


class FontSizePopup(Popup):
    pass


class RST(App):
    def build(self):
        return RST_GUI()

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