我正在尝试创建一个自定义按钮,按下时会改变颜色(实际上是改变图像的色调),但我什至无法让 on_press 正常工作。应用程序运行,但按下按钮会出现错误:“属性错误:'ImageButton'对象没有属性'change_color'”
Python 文件:
import kivy
kivy.require("1.10.0")
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image
from kivy.lang.builder import Builder
class Container(BoxLayout):
pass
class ImageButton():
def change_color(self):
print("Success!")
class TestName(App):
def build(self):
return tester
tester = Builder.load_file("test.kv")
if __name__ == '__main__':
TestName().run()
Kivy 文件:
Container:
<Container>:
BoxLayout:
ImageButton:
source: "emptybox.png"
<ImageButton@Button>:
source: None
on_press: root.change_color()
Image:
source: root.source
pos: root.pos
size: root.size
最佳答案
我在您的代码中发现两个问题:
首先,
build
方法返回tester
(Builder.load_file
的输出)。另一方面,.py 文件中的
ImageButton
类应继承自kivy.uix.button.Button
。
我不知道你想改变什么“颜色”,我给你留了一个例子,按下时改变背景颜色:
import kivy
kivy.require("1.10.0")
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.lang.builder import Builder
from random import random
kv_text = '''
<Container>:
BoxLayout:
ImageButton:
source: "emptybox.png"
<ImageButton@Button>:
source: None
on_press: self.change_color()
Image:
source: root.source
pos: root.pos
size: root.size
'''
class Container(BoxLayout):
pass
class ImageButton(Button):
def change_color(self):
self.background_color = (random(), random(), random(), 1)
class TestName(App):
def build(self):
Builder.load_string(kv_text)
return Container()
if __name__ == '__main__':
TestName().run()
输出:
关于python - 如何让 on_press 在自定义按钮中工作?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45178846/