問題描述

我是 Kivy 的新手，無法指定按鈕的背景顏色.這是我的簡單示例:

I'm new to Kivy and having trouble specifying the background color of a Button. Here's my simple example:

# custombutton.py

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


class MyWidget(Widget):
    pass


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


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

以及隨附的kv文件custombutton.kv:

#:kivy 1.7.2

<MyWidget>:
    canvas:
        Color:
            rgb: (0.93, 0.93, 0.93)
        Rectangle:
            pos: self.pos
            size: self.size

    Button:
        center: self.parent.center
        font_size: 14
        height: 28
        background_color: (1.0, 0.0, 0.0, 1.0)
        text: "I'm a Button"

我確定我遺漏了一些明顯的東西，但我已經搞砸了一個多小時，卻一無所獲.該按鈕似乎被染成了深紅色:

I'm sure I'm missing something obvious, but I've been messing with this for over an hour now and getting nowhere. The button seems to get colored a hint of very dark red:

這不是為 Kivy 中的按鈕指定背景顏色的方法嗎?

Is this not the way to specify the background color for a Button in Kivy?

謝謝！

推薦答案

啊，這是一個常見的混淆.問題是 Button.background_color 確實是一種 tint，而不僅僅是塊顏色.由于默認背景是灰色圖像(您通常會在制作無樣式按鈕時看到該圖像)，因此您最終看到的是該灰色圖像的紅色調 - 您觀察到的暗紅色.

Ah, this is a common confusion. The problem is that Button.background_color really works as a kind of tint, not just a block colour. Since the default background is a grey image (the one you normally see if you make an unstyled button), what you end up seeing is a red tint to that grey image - which comes out as the dark red you observe.

您可以通過將背景圖像替換為純白色(不必超過幾個像素)或使用 background_normal 來獲得所需的行為和 background_down 屬性.當您的 background_color 為新的純白色圖像著色時，您將獲得所需的純紅色.

You can get the behaviour you want by replacing the background image to just one that's plain white (it doesn't have to be more than a few pixels), or by otherwise playing with the background_normal and background_down properties. When your background_color tints the new pure white image, you get the pure red you're after.

我想這在文檔中不是很清楚，我會嘗試改進它.

I guess this isn't so clear in the docs, I'll try to improve it.

這篇關于在 Kivy 中更改按鈕的背景顏色的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！