kivy - 在 Kivy 中,如何在具有多个屏幕的应用程序的特定屏幕上添加 CircularProgressBar?
问题描述
我正在尝试开发一个以循环进度条的形式显示某些数据的 Kivy 应用程序。我通过这个链接了解了循环进度条:如何在 kivy 中制作循环进度条? 但是,我无法将此小部件添加到特定屏幕上。
我希望将小部件嵌入到我的屏幕上并包含一些其他小部件。我曾尝试制作一个单独的 .kv 文件,但它也不起作用。这是我的代码。我希望在我的主页中有循环进度条。
from kivy.app import App
from kivy.uix.progressbar import ProgressBar
from kivy.core.text import Label as CoreLabel
from kivy.lang.builder import Builder
from kivy.graphics import Color, Ellipse, Rectangle
from kivy.clock import Clock
from kivy.uix.screenmanager import Screen, ScreenManager
Builder.load_string('''
<HomePage>:
FloatLayout:
canvas.before:
Rectangle:
# self here refers to the widget i.e BoxLayout
pos: self.pos
size: self.size
CircularProgressBar:
size_hint:(None,None)
height:400
width:400
max:80
''')
class HomePage(Screen):
pass
class CircularProgressBar(ProgressBar):
def __init__(self,**kwargs):
super(CircularProgressBar,self).__init__(**kwargs)
self.thickness = 40
self.label = CoreLabel(text="0",font_size=self.thickness)
self.texture_size= None
self.refresh_text()
self.draw()
def draw(self):
with self.canvas:
self.canvas.clear()
#No progress
Color(0.26,0.26,0.26)
Ellipse(pos=self.pos, size=self.size)
#Progress Circle
Color(1,0,0)
Ellipse(pos=self.pos,size=self.size,angle_end=0.5*360)#will be replaced with necessary data
#Inner Circle
Color(0,0,0)
Ellipse(pos=(self.pos[0] + self.thickness / 2, self.pos[1] + self.thickness / 2),size=(self.size[0] - self.thickness, self.size[1] - self.thickness))
#Inner text
Color(1, 1, 1, 1)
Rectangle(texture=self.label.texture,size=self.texture_size,pos=(self.size[0]/2-self.texture_size[0]/2,self.size[1]/2 - self.texture_size[1]/2))
self.label.text = str(int(0.5*100))
def refresh_text(self):
self.label.refresh()
self.texture_size=list(self.label.texture.size)
def set_value(self, value):
self.value = value
self.label.text = str(int(0.5*100))
self.refresh_text()
self.draw()
sm = ScreenManager()
sm.add_widget(HomePage(name="HomePage"))
class HealthTrackingSystem(App):
def animate(self,dt):
if self.root.value<80:
self.root.set_value(self.root.set_value+1)
else:
self.root.set_value(0)
def build(self):
Clock.schedule_interval(self.animate, 0.1)
return sm
if __name__ == '__main__':
HealthTrackingSystem().run()
我在运行代码时遇到以下错误:
File "HealthTrackingSystem.py", line 70, in animate
if self.root.value<80
'ScreenManager' object has no attribute 'value'
解决方案
在您的代码中,self.root
是ScreenManager
您在build
方法中返回的。您可能希望将一个添加id
到您的CircularProgressBar:
(在 中kv
),然后使用它来引用您的CircularProgressBar
.
这是它的样子(包括编辑以CircularProgressBar
使其工作):
from kivy.app import App
from kivy.uix.progressbar import ProgressBar
from kivy.core.text import Label as CoreLabel
from kivy.lang.builder import Builder
from kivy.graphics import Color, Ellipse, Rectangle
from kivy.clock import Clock
from kivy.uix.screenmanager import Screen, ScreenManager
Builder.load_string('''
<HomePage>:
FloatLayout:
canvas.before:
Rectangle:
# self here refers to the widget i.e BoxLayout
pos: self.pos
size: self.size
CircularProgressBar:
id: cp
size_hint:(None,None)
height:400
width:400
max:80
''')
class HomePage(Screen):
pass
class CircularProgressBar(ProgressBar):
def __init__(self,**kwargs):
super(CircularProgressBar,self).__init__(**kwargs)
self.thickness = 40
self.label = CoreLabel(text="0",font_size=self.thickness)
self.texture_size= None
self.refresh_text()
self.draw()
def draw(self):
with self.canvas:
self.canvas.clear()
#No progress
Color(0.26,0.26,0.26)
Ellipse(pos=self.pos, size=self.size)
#Progress Circle
Color(1,0,0)
Ellipse(pos=self.pos,size=self.size,angle_end=(self.value/100.0)*360)#will be replaced with necessary data
#Inner Circle
Color(0,0,0)
Ellipse(pos=(self.pos[0] + self.thickness / 2, self.pos[1] + self.thickness / 2),size=(self.size[0] - self.thickness, self.size[1] - self.thickness))
#Inner text
Color(1, 1, 1, 1)
Rectangle(texture=self.label.texture,size=self.texture_size,pos=(self.size[0]/2-self.texture_size[0]/2,self.size[1]/2 - self.texture_size[1]/2))
self.label.text = str(int(self.value))
def refresh_text(self):
self.label.refresh()
self.texture_size=list(self.label.texture.size)
def set_value(self, value):
self.value = value
self.label.text = str(int(self.value))
self.refresh_text()
self.draw()
sm = ScreenManager()
sm.add_widget(HomePage(name="HomePage"))
class HealthTrackingSystem(App):
def animate(self,dt):
circProgressBar = self.root.get_screen('HomePage').ids.cp
if circProgressBar.value<80:
circProgressBar.set_value(circProgressBar.value+1)
else:
circProgressBar.set_value(0)
def build(self):
Clock.schedule_interval(self.animate, 0.1)
return sm
if __name__ == '__main__':
HealthTrackingSystem().run()
推荐阅读
- html - 如果有人更改 HTML 表单输入的名称怎么办
- android - 在没有 ImageCapture 用例的情况下运行 android camerax 时出现意外的 logcat 错误
- python - Python - psycopg2 IndexError:列表索引超出范围
- spring - 如何用父文档展平动态字段 - 没有 Mongodb 聚合的 Spring data Mongo DB
- python-3.x - Python 名称“latest_email_uid”未定义
- flutter - Appbar 过渡动画 (Flutter)
- swift - Swift @propertyWrapper 'Self' 指的是封闭的结构/类而不是属性包装器结构
- amazon-web-services - 如何临时打开和关闭 AWS 安全组上某个 IP 的端口?
- ruby-on-rails - Rspec - 存根块并测试生成的主体的更好方法
- powershell - 如何在powershell脚本结束时自动停止所有启动的进程