在Kivy on_complete动画事件中使用递归? [英] using recursion with Kivy on_complete Animation event?

问题描述

我尝试按顺序对10个小部件进行动画处理，每个动画应在上一个完成时开始.不幸的是，我下面的解决方案会按顺序触发所有动画，而无需等待任何操作完成.

I am attempting to animate 10 widgets in sequence, each animation should start as the previous completes. Unfortunately my solution below fires all the animations in sequence without waiting for anything to complete.

def Animate_Widget(self,index):
    if index < 10:
        anim = Animation(x = self.position[index][0], y = self.position[index][1], d=1)
        anim.bind(on_complete=self.Animate_Widget(index + 1))
        anim.start(self.ids['widget' + str(index)])

def Resize_Layout(self):
    self.Animate_Widget(0)

推荐答案

此处:

anim.bind(on_complete=self.Animate_Widget(index + 1))

您立即拨打回叫电话.这是因为anim.bind的参数是在调用时求值的.而是定义另一个函数或lambda来延迟可以不带任何参数调用的调用:

You call your callback straight away. This is because the arguments to anim.bind are evaluated when calling. Instead, define another function or lambda to delay calling that can be called without any arguments:

def callback():
    self.Animate_Widget(index + 1)
anim.bind(on_complete=callback)

或者:

anim.bind(on_complete=lambda: self.Animate_Widget(index + 1))

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