kivy - 你如何使用 kivy 更改应用程序的 Canvas 或窗口大小

Question

如何使用 Kivy 更改窗口的大小。我一直在四处寻找，除了进入窗口的大小之外，我几乎可以更改所有内容。

从示例图片文件:
主文件

#!/usr/bin/kivy
'''
Pictures demo
=============

This is a basic picture viewer, using the scatter widget.
'''

import kivy
kivy.require('1.0.6')

from glob import glob
from random import randint
from os.path import join, dirname
from kivy.app import App
from kivy.logger import Logger
from kivy.uix.scatter import Scatter
from kivy.properties import StringProperty
# FIXME this shouldn't be necessary
from kivy.core.window import Window


class Picture(Scatter):
    '''Picture is the class that will show the image with a white border and a
    shadow. They are nothing here because almost everything is inside the
    picture.kv. Check the rule named <Picture> inside the file, and you'll see
    how the Picture() is really constructed and used.

    The source property will be the filename to show.
    '''

    source = StringProperty(None)


class PicturesApp(App):

    def build(self):

        # the root is created in pictures.kv
        root = self.root

        # get any files into images directory
        curdir = dirname(__file__)
        for filename in glob(join(curdir, 'images', '*')):
            try:
                # load the image
                picture = Picture(source=filename, rotation=randint(-30,30))
                # add to the main field
                root.add_widget(picture)
            except Exception as e:
                Logger.exception('Pictures: Unable to load <%s>' % filename)

    def on_pause(self):
        return True


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

图片.kv

#:kivy 1.0
#:import kivy kivy
#:import win kivy.core.window

FloatLayout:
    canvas:
        Color:
            rgb: 1, 1, 1
        Rectangle:
            source: 'data/images/background.jpg'
            size: self.size

    BoxLayout:
        padding: 10
        spacing: 10
        size_hint: 1, None
        pos_hint: {'top': 1}
        height: 44
        Image:
            size_hint: None, None
            size: 24, 24
            source: 'data/logo/kivy-icon-24.png'
        Label:
            height: 24
            text_size: self.width, None
            color: (1, 1, 1, .8)
            text: 'Kivy %s - Pictures' % kivy.__version__



<Picture>:
    # each time a picture is created, the image can delay the loading
    # as soon as the image is loaded, ensure that the center is changed
    # to the center of the screen.
    on_size: self.center = win.Window.center
    size: image.size
    size_hint: None, None

    Image:
        id: image
        source: root.source

        # create initial image to be 400 pixels width
        size: 400, 400 / self.image_ratio

        # add shadow background
        canvas.before:
            Color:
                rgba: 1,1,1,1
            BorderImage:
                source: 'shadow32.png'
                border: (36,36,36,36)
                size:(self.width+72, self.height+72)
                pos: (-36,-36)

我希望能够在 FloatLayout 或 Canvas 中放置一个大小标签以调整窗口大小，但它似乎不起作用。

在应用程序运行之前，我如何确定 Canvas (或包含窗口 - 也许我正在使用错误的术语进行搜索)将有多大？

-编辑-
我发现在 .py 的包含部分添加以下内容有效:

from kivy.config import Config 
Config.set('graphics', 'width', '640') 
Config.set('graphics', 'height', '1163')

有没有办法只使用 .kv 文件来做到这一点？

Answer 1

不，大小不能以 kv 为单位设置。您可以使用 Config 设置它如上所述，或者您可以稍后通过在 Window 上设置大小来更改窗口大小。目的:

from kivy.core.window import Window
Window.size = (640, 1163)