python kivy显示图片_Kivy图像未显示在toggleButton内的网格布局中 - python

这是我的第一个Kivy GUI界面，因此我怀疑我没有正确执行某些操作。但是，我想知道为什么会这样或如何达到期望的结果。

我正在尝试在“切换按钮”中渲染图像。无论出于何种原因，在运行应用程序时仅加载第二个按钮。

我将引发问题的切换按钮涂成绿色，因此可以检查定位是否关闭。绑定到按钮的功能起作用，图像图标将完全不显示。

这是我的.kv文件：

:

lbl: my_label

tbl: my_other_label

atl: attendant_label

timg: my_test_img

aimage: attendant_img

BoxLayout:

canvas.before:

Color:

rgba: 0.137, 0.149, 0.161, 1

Rectangle:

# self here refers to the widget i.e BoxLayout

pos: self.pos

size: self.size

orientation:'horizontal'

GridLayout:

cols:1

rows:2

##THIS DOES NOT DISPLAY

ToggleButton:

id:attendant_label

group: 'g2'

border:0,0,0,0

background_color:(0, 1, 0, 1.0)

background_normal:''

background_down: ''

on_press: root.attendantchange(*args)

Image:

id:attendant_img

source: 'attendantoff.png'

size: self.parent.width, self.parent.height

##THIS DISPLAYS..

ToggleButton:

id:my_other_label

group: 'g1'

border:0,0,0,0

background_color:(0.137, 0.149, 0.161, 1.0)

background_normal:''

background_down: ''

on_press: root.buttonchange(*args)

Image:

id:my_test_img

source: 'bulb1.png'

size: self.parent.width, self.parent.height

Slider:

canvas:

Color:

rgb: 0.89,0.694,0

BorderImage:

border: (0, 18, 0, 18) if self.orientation == 'horizontal' else (18, 0, 18, 0)

pos: (self.x + self.padding, self.center_y - sp(18)) if self.orientation == 'horizontal' else (self.center_x - 35, self.y + self.padding)

size: (max(self.value_pos[0] - self.padding * 2 - sp(16), 0), sp(36)) if self.orientation == 'horizontal' else (sp(36), max(self.value_pos[1] - self.padding * 2, 0))

source: 'atlas://data/images/defaulttheme/slider{}_background{}'.format(self.orientation[0], '_disabled' if self.disabled else '')

id:my_label

size_hint:.25,1

min: 0

max: 100

enabled: False

disabled: True

orientation:'vertical'

value_track_color: [0, 1, 0, 1]

on_value: root.new_brightness(*args)

这是Python代码：

import paho.mqtt.client as mqtt

import kivy

from kivy.app import App

from kivy.uix.label import Label

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.gridlayout import GridLayout

kivy.require('1.10.1') # replace with your current kivy version !

class Controller(BoxLayout):

def __init__(self):

self.buttonState = 0;

self.attendantState = 0;

self.oldBrightness = '0';

self.client = mqtt.Client();

super(Controller,self).__init__()

def new_brightness(self,*args):

if(self.buttonState == 0):

print('light is off');

else:

#self.lbl.text = str(int(args[1]))

#self.tbl.text = str(int(args[1]))

self.oldBrightness = str(int(args[1]))

if(int(args[1]) <= 10):

self.timg.source = "bulb2.png"

elif (int(args[1]) <= 50):

self.timg.source = "bulb2.png"

else:

self.timg.source = "bulb2.png"

self.publish(self.oldBrightness)

def buttonchange(self,*args):

if(self.buttonState == 0):

self.buttonState = 1;

self.lbl.enabled = True;

self.lbl.disabled = False;

self.timg.source='bulb2.png'

self.publish(1)

else:

self.buttonState = 0;

self.timg.source='bulb1.png'

self.lbl.enabled = False;

self.lbl.disabled = True;

self.publish(0)

#self.tbl.text = str(self.buttonState)

print(str(self.__class__) + ": " + str(self.__dict__))

def attendantchange(self,*args):

if(self.attendantState == 0):

self.attendantState = 1;

self.aimage.source='attendanton.png'

else:

self.attendantState = 0;

self.aimage.source='attendantoff.png'

print(str(self.__class__) + ": " + str(self.__dict__))

def __str__(self):

return str(self.__class__) + ": " + str(self.__dict__)

def publish(self,value):

# When I manually send a message from the command line, there is a connect, send, disconnect process

# I am recreating that process here as opposed to connecting once and leaving the connection open.

# If there is only a single connection attempt which fails because the receiver is powered off, etc

# that would leave us with no way to reestablish communications

# connect to broker

Broker = "192.168.1.21"

pub_topic = "RL"

#self.client.connect(Broker, 1883, 60)

# I need this for message subscriptions; not sure about publising

#self.client.loop_start()

# send updated value to reading light

#self.client.publish(pub_topic, value)

# close everything down after sending a message

#self.client.loop_stop()

#self.client.disconnect()

class MyApp(App):

def build(self):

return Controller()

window = MyApp()

window.run()

参考方案

如果我了解您的要求，则可以简单地通过使用background_normal的background_down和ToggleButton属性来实现。另外，ToggleButton不是容器，因此尝试将Image用作ToggleButton的子代并没有任何意义。因此，在您的Kivy文件中，尝试像这样设置ToggleButton：

##THIS DOES NOT DISPLAY

ToggleButton:

id:attendant_label

group: 'g2'

border:0,0,0,0

background_normal:'attendantoff.png'

background_down: 'attendanton.png'

on_press: root.attendantchange(*args)

消除Image的ToggleButton子级，并删除root.attendantchange()中试图更改Image的代码。对其他ToggleButton进行相同的更改。另外，请注意background_color中的ToggleButton只是对实际图像进行着色，因此您可能也希望将其删除。

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