Kivy在移动小部件时获取其在散布中的位置 [英] Kivy Get Position of Widget in Scatter while moving it

问题描述

我进行了很多搜索，没有找到解决方案.我想抓住一个零散的小部件，并在每次移动它时获取它的位置.因此可能是这样:

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))

在移动小部件的同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*有效示例. (只需将cat.png放在某处...)

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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