Python / Kivy / Gif : 如何在动画后删除 gif

Question

我想要一个Gif作为开场动画，在动画之后被删除或移走。然而似乎没有任何效果，图像只是停留在那里。

from kivy.uix.widget import Widget
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.button import Button
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.textinput import TextInput
from kivy.core.text import LabelBase
from kivy.uix.image import Image
from kivy.properties import StringProperty
from kivy.lang import Builder
from kivy.factory import Factory
from kivymd.app import App
from kivy.uix.label import Label
from kivy.clock import Clock
from kivy.extras.highlight import KivyLexer
from kivy.lang.parser import ParserException
from kivy.properties import ColorProperty
from kivymd.uix.label import MDLabel
from kivy.animation import Animation
from kivy.uix.screenmanager import ScreenManager, Screen

import time
import threading
import random

kv = ("""   
FloatLayout:
    canvas.before:
        Rectangle:
            pos: self.pos
            size: self.size
            source: 'test_back.png'

    Image:
        id: intro
        source: 'test_anim.gif'
        size_hint: None, None
        size: "500dp", "500dp"
        pos_hint: {'center_x':.5, 'center_y':.5}
        allow_stretch: False
        anim_delay: 0.05
        anim_loop: 1

""")

class testApp(App):
    def build(self):
        kivy_design = Builder.load_string(kv)
        self.app_root = kivy_design
        return kivy_design

    def on_start(self):
        frame_counter = 0
        frame_counter += 1
        if frame_counter == 30:
            self.app_root.ids.intro.pos_hint = {'center_x':-.5, 'center_y':-.5}

testApp().run()

我现在已经尝试了一段时间，并且还查看了其他类似的问题。

我错过了什么？感谢阅读

Answer 1

我不确定编码答案是什么，但理论可能是您找到了 GIF 的长度。在页面上播放 GIF 并根据 GIF 的长度设置显示时间，然后再显示另一个页面，然后显示您想要的内容。

Answer 2

您可以安排删除 intro，并一直延迟删除直到 gif 停止。这是您的代码的修改版本：

from kivy.clock import Clock
from kivy.lang import Builder
from kivymd.app import App

kv = ("""   
FloatLayout:
    canvas.before:
        Rectangle:
            pos: self.pos
            size: self.size
            source: 'test_back.png'

    Image:
        id: intro
        source: 'test_anim.gif'
        size_hint: None, None
        size: "500dp", "500dp"
        pos_hint: {'center_x':.5, 'center_y':.5}
        allow_stretch: False
        anim_delay: 0.05
        anim_loop: 1
        on_texture: app.texture_updated()  # this lets us know every frame

""")

class testApp(App):
    def build(self):
        kivy_design = Builder.load_string(kv)
        self.app_root = kivy_design
        return kivy_design

    def on_start(self):
        # schedule removal of intro gif
        self.remove_it = Clock.schedule_once(self.remove_gif, self.root.ids.intro.anim_delay * 2)

    def texture_updated(self):
        # gif has been updated, so cancel removal
        self.remove_it.cancel()

        # reschedule removal
        self.remove_it = Clock.schedule_once(self.remove_gif, self.root.ids.intro.anim_delay * 2)

    def remove_gif(self, dt):
        # actually remove the intro gif
        self.root.remove_widget(self.root.ids.intro)



testApp().run()

Python / Kivy / Gif : 如何在动画后删除 gif

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