如何获取在kivy中动画的对象？

Question

问题：

• 如何在 Kivy 中获取动画对象？
• 是否可以获取动画对象？

---

代码：

from kivy.app import App
from kivy.animation import Animation
from kivy.uix.image import Image
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen


class ScreenOne(Screen):
    def __init__(self, **kwargs):
        super(ScreenOne, self).__init__(**kwargs)
        self.img1 = Image(source="F:\PyCharm Python Works\Kivy Test\opencityicon (1).png")
        box_layout = BoxLayout()
        self.add_widget(box_layout)
        box_layout.add_widget(self.img1)

    def on_enter(self, *args):
        animation = Animation(d=1, x=560)
        animation.start(self.img1)
        print(animation.animated_properties)


sm = ScreenManager()
sm.add_widget(ScreenOne(name='screen_one'))
sm.current = 'screen_one'


class Test(App):
    def build(self):
        return sm


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

我无法在 Kivy 的文档中找到我的问题的答案！

---

感谢您的阅读！！

Answer 1

这是Animation、Sequence 和Parallel 类的自定义版本和一个简单的测试用例：

from kivy.animation import Animation, Sequence, Parallel
from kivy.app import App
from kivy.clock import Clock
from kivy.properties import ListProperty
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label


class MySequence(Sequence):
    widgets = ListProperty([])

    def start(self, widget):
        super(MySequence, self).start(widget)
        self.widgets.append(widget)

    def __add__(self, animation):
        return MySequence(self, animation)

    def __and__(self, animation):
        return MyParallel(self, animation)

class MyParallel(Parallel):
    widgets = ListProperty([])

    def start(self, widget):
        super(MyParallel, self).start(widget)
        self.widgets.append(widget)

    def __add__(self, animation):
        return MySequence(self, animation)

    def __and__(self, animation):
        return MyParallel(self, animation)

class MyAnim(Animation):
    widgets = ListProperty([])

    def start(self, widget):
        super(MyAnim, self).start(widget)
        self.widgets.append(widget)

    def __add__(self, animation):
        return MySequence(self, animation)

    def __and__(self, animation):
        return MyParallel(self, animation)


class TestApp(App):
    def animate(self, instance):
        self.animation = MyAnim(pos=(200, 200), d=5)
        self.animation.on_complete = self.completed

        # sequential
        # self.animation += MyAnim(pos=(400, 400), t='out_sine')

        # parallel
        self.animation &= MyAnim(size=(200, 300), d=5)

        Clock.schedule_once(self.another_anim, 1)

        self.animation.start(instance)

    def another_anim(self, dt):
        self.animation.start(self.label)

    def completed(self, widget):
        print('Animation completed - animated Widget:', widget)
        Clock.schedule_once(self.check_anim, 2)

    def check_anim(self, dt):
        print(dt, 'seconds after Animation completed - animated Widgets:', self.animation.widgets)

    def build(self):
        fl = FloatLayout()
        button = Button(size_hint=(None, None), size=(100,50), pos=(0,0), text='click here', on_press=self.animate)
        fl.add_widget(button)
        self.label = Label(text='label', size_hint=(None, None), size=(100, 500), pos=(400, 200))
        fl.add_widget(self.label)
        return fl

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

如果您使用它代替Animation，那么您可以访问widgets 动画Widgets 列表。