带参数的 Kivy 按钮绑定函数 [英] Kivy button binding function with argument
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问题描述
我正在尝试学习如何在 Kivy 中创建应用程序,但在向函数发送参数时遇到问题.我想将文本从输入发送到函数并打印出来.有人能告诉我该怎么做吗?
I am trying to learn how to create application in Kivy and I have problem with sending argument to the function. I want to send text from input to the function and print it. Can somebody tell me how can I do it ?
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
class TutorialApp(App):
def gratulation(self, *args):
print args
def build(self):
boxLayout = BoxLayout(spacing=10,orientation='vertical')
g = TextInput(text='Enter gratulation',
multiline=False,
font_size=20,
height=100)
button = Button(text='Send')
button.bind(on_press=self.gratulation)
boxLayout.add_widget(g)
boxLayout.add_widget(button)
return boxLayout
if __name__ == "__main__":
TutorialApp().run()
推荐答案
你必须从 "g" 获取文本,然后将其发送到按钮回调,有两种方法可以做到这一点,通过 lambda 函数,或调用你的类方法适用于它.
Yo must get the text from "g" and then send it to the button callback, there is 2 ways of doing this, by a lambda function, or calling your class method aplying to it.
Lambda 版本:
from __future__ import print_function ##Need to import this for calling print inside lambda
def build(self):
boxLayout = BoxLayout(spacing=10,orientation='vertical')
g = TextInput(text='Enter gratulation',
multiline=False,
font_size=20,
height=100)
button = Button(text='Send')
buttoncallback = lambda:print(g.text)
button.bind(on_press=buttoncallback)
...
部分版本:
from functools import partial ##import partial, wich allows to apply arguments to functions returning a funtion with that arguments by default.
def build(self):
boxLayout = BoxLayout(spacing=10,orientation='vertical')
g = TextInput(text='Enter gratulation',
multiline=False,
font_size=20,
height=100)
button = Button(text='Send')
buttoncallback = partial(self.gratulation, g.text)
button.bind(on_press=buttoncallback)
...
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