在 Kivy 中将图像对象作为按钮背景传递
问题描述
在 Kivy 中，有没有办法将图像对象作为按钮背景传递，而不是图像文件名?
In Kivy, is there a way to pass image object as a button background, instead of image file name?
button.background_normal 属性只接受字符串.我想自定义图像属性，例如 allow_stretch = False.
button.background_normal property accepts only strings. I would like to customize image properties, such as allow_stretch = False.
如果成功，我如何在按钮内指定图像对齐方式，例如.让它左上对齐?
If that succeeds, how can I specify image alignment inside a button, eg. to make it top-left aligned?
解决方案
source 只是 Button 的一个属性，正如你所指出的，它是一个字符串.你想要一个 Widget 里面有一个 Widget，这就是 Kivy 工作的基本方式.所以只需按原样添加图像.一点定位就可以完成剩下的工作.
The source is just a property of Button and it is a string as you pointed out. You want a Widget inside a Widget, and that is the basic way Kivy works. So just add the Image as it is. A little bit of positioning would do the rest.
你必须小心定位.确保它位于可见部分并且没有任何东西覆盖它.我在按钮后使用标签，因为它具有透明颜色，因此您可以尝试使用它.例如，如果您的定位错误(尝试 x:0 y:0)，您可以看到按钮转到标签区域的左下角.
You have to be careful with the positioning. Make sure it is in a visible part and nothing covers it. I use a Label after the button because it has transparent Color so you can experimenting with it. For example if your positioning is wrong (try x:0 y:0) you can see the button going to the bottom-left corner in the label area.
我使用的图片是 Kivy 标志:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
Builder.load_string("""
<ButtonsApp>:
orientation: "vertical"
Button:
text: "B1"
Image:
source: 'kivy.png'
y: self.parent.y + self.parent.height - 250
x: self.parent.x
size: 250, 250
allow_stretch: True
Label:
text: "A label"
""")
class ButtonsApp(App, BoxLayout):
def build(self):
return self
if __name__ == "__main__":
ButtonsApp().run()
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