kivy 中的动画浮动操作按钮 - Python

Kivy 是Python中一个独立于平台的 GUI 工具。因为它可以在Android、IOS、linux和Windows等平台上运行。它基本上是用来开发Android应用程序的，但这并不意味着它不能在桌面应用程序上使用。
在本文中，我们将了解如何将动画添加到浮动动作按钮。要了解如何创建它，您必须了解动画和时钟。

Animation : Animation and AnimationTransition are used to animate Widget properties. You must specify at least a property name and target value. To use an Animation, follow these steps:

Setup an Animation object
Use the Animation object on a Widget

To animate a Widget’s x or y position, simply specify the target x/y values where you want the widget positioned at the end of the animation:

Clock: The Clock object allows you to schedule a function call in the future; once or repeatedly at specified intervals.
It is must to use kivy inbuilt module while working with Animation and clock –

编程需要懂一点英语

anim = Animation(x=100, y=100)
anim.start(widget)

Kivy Tutorial – Learn Kivy with Examples.

编程需要懂一点英语

方法的实施：
main.py 文件

Python3

from kivy.animation import Animation
from kivy.clock import Clock

Python3

Basic Approach:

1) import kivy
2) import kivyApp
3) import Boxlayout
4) import Animation
5) Import Clock
6) Set minimum version(optional)
7) create Layout class and Add(create) animation in it
8) create App class
9) Set up .kv file :
       1) Add Floating Button Properties
       2) Create Main Window
       3) Add Float Button(don't forget to give id)
10) return Layout/widget/Class(according to requirement)
11) Run an instance of the class

.kv 文件

Python3

## Sample Python application demonstrating that
## How to create a button like floating Action Button
## in Kivy using .kv file
   
###################################################
# import modules
   
import kivy
   
# base Class of your App inherits from the App class.  
# app:always refers to the instance of your application 
from kivy.app import App
   
# BoxLayout arranges widgets in either
# in a vertical fashion that
# is one on top of another or in a horizontal
# fashion that is one after another.
from kivy.uix.boxlayout import BoxLayout
   
# To change the kivy default settings 
# we use this module config 
from kivy.config import Config 
      
# 0 being off 1 being on as in true / false 
# you can use 0 or 1 && True or False 
Config.set('graphics', 'resizable', True)
 
# The Clock object allows you to
# schedule a function call in the future
from kivy.clock import Clock
 
# To work with Animation you must have to import it
from kivy.animation import Animation
 
# creating the root widget used in .kv file
class MainWindow(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
 
        # Schedule the interval for the animation
        Clock.schedule_interval(self.breath, 1)
 
    # Creating Animation function name breath
    def breath(self, dtx):
 
        # create an animation object. This object could be stored
        # and reused each call or reused across different widgets.
        # += is a sequential step
        anim = (Animation(btn_size =(60, 60), t ='in_quad', duration =.5)+
               Animation(btn_size =(70, 70), t ='in_quad', duration =.5))
 
        # Call the button id
        tgt = self.ids.cta
 
        # Start the Animation
        anim.start(tgt)
 
 
# creating the App class in which name
#.kv file is to be named main.kv
class MainApp(App):
    # defining build()
    def build(self):
        # returning the instance of root class
        return MainWindow()
 
# run the app
if __name__ == '__main__':
    MainApp().run()

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