Kivy 在移动时获取小部件在 Scatter 中的位置

问题描述

我搜索了很多，但没有找到解决方案.我想在 kivy scatter 中抓取一个小部件，并在每次移动它时获取它的位置.所以它可能是这样的:

I searched a lot for it bit i didn't find a solution. I would like to grab a widget in a kivy scatter and get the position of it each time i move it. So it could like so:

def onmove_in_scatter(args):
    x = args[0]
    y = args[1]
    print("You are currently here: "+str(x)+":"+str(y))

在我移动小部件时调用该函数很重要.

It's important that the function is called WHILE i move the widget.

推荐答案

当我想做这样的事情时，我会覆盖 on_touch_move.

When I want to do something like this I override the on_touch_move.

这是一个完整的*工作示例.(只需在某个地方放一个 cat.png...)

Here is a full* working example. (just put a cat.png somewhere...)

import kivy
import datetime

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.factory import Factory
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.scatter import Scatter




Builder.load_string("""
<MyScatter>:
    id: cool
    #pos: 200, 200
    #size: 300,300
    Image:
        id: img
        source: "cat.png"
        allow_stretch:  True
        size: cool.size
<P>:
    MyScatter:


""")


class MyScatter(Scatter):


    def on_touch_move(self, touch): #magic time!!!!
        res =  super(MyScatter, self).on_touch_move(touch)
        if res: #Yay do something!
            print self.center
        return res
class P(FloatLayout):
    pass


class MyApp(App):


    def build(self):
        return P()


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

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