Kivy 给进度条传值
Kivy passing value to the progress bar
代码有效，但我想从函数（使用 Raspberrypi GPIO 引脚获取传感器值）传递值来获取值，而不是此代码中使用的滑块，但我不确定如何实施它。你能帮帮我吗
我从这里引用了这段代码https://github.com/olivier-boesch/garden.imageprogressbar/blob/master/imageprogressbar.py
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.image import Image
from kivy.properties import OptionProperty, StringProperty, ObjectProperty, ListProperty, AliasProperty, \
BooleanProperty, NumericProperty
from kivy.lang.builder import Builder
from kivy.clock import Clock
# kv info for ImageProgressBar
kvstr = """
<CroppedImage>
canvas.before:
StencilPush
Rectangle:
pos: self.rectangle_pos
size: self.rectangle_size
StencilUse
canvas.after:
StencilUnUse
Rectangle:
pos: self.rectangle_pos
size: self.rectangle_size
StencilPop
<ImageProgressBar>
Image:
id: background_progress_image
source: root.source_progress if root.draw_progress_background else None
color : root.color_progress_background if root.draw_progress_background else [0,0,0,0]
pos: root.pos
size: root.size
allow_stretch: True
CroppedImage:
id: progress_image
source: root.source_progress
color: root.color_progress
pos: root.pos
size: root.size
allow_stretch: True
Image:
id: front_image
color: root.color_front
source: root.source_front
pos: root.pos
size: root.size
allow_stretch: True
Label:
id: text_lbl
pos: root.pos
size: root.size
"""
class CroppedImage(Image):
"""CroppedImage : Image widget where texture can be cropped with Stencil Instructions"""
# position and size of the stencil mask (internal use)
rectangle_pos = ListProperty([0.1, 0.7])
rectangle_size = ListProperty([0, 0])
# direction of cropping (bt -> bottom to top, lr -> left to right, ...)
direction = OptionProperty('bt', options=['bt', 'tb', 'lr', 'rl'])
# visible percentage of the image [0,100]
visible_percent = NumericProperty(0)
# minimum position of the portion of the image corresponding to 0% and length of 0% to 100% (in pixel of the image file)
min_pos = NumericProperty(0)
max_length = NumericProperty(100)
def on_visible_percent(self, inst, val):
self.update_view()
def update_view(self):
"""update_view : update the pos and size of the rectangle stencil mask"""
if self.texture:
# get how image is resized (zoom factor)
zoom_ratio = self.norm_image_size[1] / float(self.texture.size[1])
# where going from bottom (0%) to top (100%)
if self.direction == 'bt':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., self.center_y - self.norm_image_size[
1] / 2.
self.rectangle_size = self.norm_image_size[0], (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
# where going from top (0%) to bottom (100%)
elif self.direction == 'tb':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., (
self.center_y + self.norm_image_size[1] / 2.) - (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
self.rectangle_size = self.norm_image_size[0], (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
# where going from left (0%) to right (100%)
elif self.direction == 'lr':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., self.center_y - self.norm_image_size[
1] / 2.
self.rectangle_size = (self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, \
self.norm_image_size[1]
# where going from right (0%) to left (100%)
elif self.direction == 'rl':
self.rectangle_pos = (self.center_x + self.norm_image_size[0] / 2.) - (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, self.center_y - \
self.norm_image_size[1] / 2.
self.rectangle_size = (self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, \
self.norm_image_size[1]
def on_direction(self, inst, val):
self.update_view()
def on_size(self, inst, val):
self.update_view()
def on_pos(self, inst, val):
self.update_view()
def __init__(self, **kwargs):
super().__init__(**kwargs)
class ImageProgressBar(FloatLayout):
# Images Properties
source_front = StringProperty(None)
color_front = ListProperty([1, 1, 1, 1])
source_progress = StringProperty(None)
color_progress = ListProperty([0.196, 0.643, 0.808, 1])
draw_progress_background = BooleanProperty(False)
color_progress_background = ListProperty([0.035, 0.118, 0.149, 1])
min_pos = NumericProperty(0)
max_length = NumericProperty(0)
value = NumericProperty(0)
direction = OptionProperty('rl', options=['bt', 'tb', 'lr', 'rl'])
text_auto = BooleanProperty(True)
text = StringProperty('')
def get_text_label(self):
return self.ids['text_lbl']
def on_text(self, inst, val):
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_text_auto(self, inst, val):
self.ids['progress_image'].update_view()
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_value(self, inst, val):
self.ids['progress_image'].visible_percent = val
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_direction(self, inst, val):
self.ids['progress_image'].direction = val
def on_min_pos(self, inst, val):
self.ids['progress_image'].min_pos = val
def on_max_length(self, inst, val):
self.ids['progress_image'].max_length = val
def first_update(self):
self.ids['progress_image'].update_view()
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (self.value,)
else:
self.ids['text_lbl'].text = self.text
def __init__(self, **kwargs):
Builder.load_string(kvstr)
super().__init__(**kwargs)
Clock.schedule_once(lambda dt: self.first_update(), 2.1)
if __name__ == '__main__':
from kivy.uix.boxlayout import BoxLayout
from kivy.app import App
appkvstr = """
#:import syringe shapes.syringe.info
#:import dna shapes.dna.info
#:import simple shapes.simple_tank.info
#:import graph shapes.graph.info
<Main@BoxLayout>:
orientation: 'horizontal'
padding: 10
BoxLayout:
orientation: 'vertical'
spacing: 5
ImageProgressBar:
source_front: 'shapes/simple_tank/front.png'
source_progress: 'shapes/simple_tank/back.png'
value: sldr.value
min_pos: simple.start
max_length: simple.length
direction: simple.direction
Slider:
id: sldr
max: 100
min: 0
"""
class Main(BoxLayout):
pass
class TestApp(App):
def __init__(self, **kwargs):
Builder.load_string(appkvstr)
super().__init__(**kwargs)
def build(self):
return Main()
TestApp().run()
我没有对此进行测试，但我认为您可以在某处创建一个 NumericProperty，并将其用于 ImageProgressBar 值。例如，在 Main class:
class Main(BoxLayout):
value = NumericProperty(0)
然后，在kv中可以参考上面的Property:
<Main@BoxLayout>:
orientation: 'horizontal'
padding: 10
BoxLayout:
orientation: 'vertical'
spacing: 5
ImageProgressBar:
source_front: 'shapes/simple_tank/front.png'
source_progress: 'shapes/simple_tank/back.png'
value: root.value # use the value from the Main class
min_pos: simple.start
max_length: simple.length
direction: simple.direction
那么你只需要更新Main的valueProperty，ImageProgressBar应该会自动更新。更新 value 属性 可以在单独的线程中完成，也许在循环中。
代码有效，但我想从函数（使用 Raspberrypi GPIO 引脚获取传感器值）传递值来获取值，而不是此代码中使用的滑块，但我不确定如何实施它。你能帮帮我吗
我从这里引用了这段代码https://github.com/olivier-boesch/garden.imageprogressbar/blob/master/imageprogressbar.py
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.image import Image
from kivy.properties import OptionProperty, StringProperty, ObjectProperty, ListProperty, AliasProperty, \
BooleanProperty, NumericProperty
from kivy.lang.builder import Builder
from kivy.clock import Clock
# kv info for ImageProgressBar
kvstr = """
<CroppedImage>
canvas.before:
StencilPush
Rectangle:
pos: self.rectangle_pos
size: self.rectangle_size
StencilUse
canvas.after:
StencilUnUse
Rectangle:
pos: self.rectangle_pos
size: self.rectangle_size
StencilPop
<ImageProgressBar>
Image:
id: background_progress_image
source: root.source_progress if root.draw_progress_background else None
color : root.color_progress_background if root.draw_progress_background else [0,0,0,0]
pos: root.pos
size: root.size
allow_stretch: True
CroppedImage:
id: progress_image
source: root.source_progress
color: root.color_progress
pos: root.pos
size: root.size
allow_stretch: True
Image:
id: front_image
color: root.color_front
source: root.source_front
pos: root.pos
size: root.size
allow_stretch: True
Label:
id: text_lbl
pos: root.pos
size: root.size
"""
class CroppedImage(Image):
"""CroppedImage : Image widget where texture can be cropped with Stencil Instructions"""
# position and size of the stencil mask (internal use)
rectangle_pos = ListProperty([0.1, 0.7])
rectangle_size = ListProperty([0, 0])
# direction of cropping (bt -> bottom to top, lr -> left to right, ...)
direction = OptionProperty('bt', options=['bt', 'tb', 'lr', 'rl'])
# visible percentage of the image [0,100]
visible_percent = NumericProperty(0)
# minimum position of the portion of the image corresponding to 0% and length of 0% to 100% (in pixel of the image file)
min_pos = NumericProperty(0)
max_length = NumericProperty(100)
def on_visible_percent(self, inst, val):
self.update_view()
def update_view(self):
"""update_view : update the pos and size of the rectangle stencil mask"""
if self.texture:
# get how image is resized (zoom factor)
zoom_ratio = self.norm_image_size[1] / float(self.texture.size[1])
# where going from bottom (0%) to top (100%)
if self.direction == 'bt':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., self.center_y - self.norm_image_size[
1] / 2.
self.rectangle_size = self.norm_image_size[0], (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
# where going from top (0%) to bottom (100%)
elif self.direction == 'tb':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., (
self.center_y + self.norm_image_size[1] / 2.) - (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
self.rectangle_size = self.norm_image_size[0], (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio
# where going from left (0%) to right (100%)
elif self.direction == 'lr':
self.rectangle_pos = self.center_x - self.norm_image_size[0] / 2., self.center_y - self.norm_image_size[
1] / 2.
self.rectangle_size = (self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, \
self.norm_image_size[1]
# where going from right (0%) to left (100%)
elif self.direction == 'rl':
self.rectangle_pos = (self.center_x + self.norm_image_size[0] / 2.) - (
self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, self.center_y - \
self.norm_image_size[1] / 2.
self.rectangle_size = (self.min_pos + self.max_length * self.visible_percent / 100.0) * zoom_ratio, \
self.norm_image_size[1]
def on_direction(self, inst, val):
self.update_view()
def on_size(self, inst, val):
self.update_view()
def on_pos(self, inst, val):
self.update_view()
def __init__(self, **kwargs):
super().__init__(**kwargs)
class ImageProgressBar(FloatLayout):
# Images Properties
source_front = StringProperty(None)
color_front = ListProperty([1, 1, 1, 1])
source_progress = StringProperty(None)
color_progress = ListProperty([0.196, 0.643, 0.808, 1])
draw_progress_background = BooleanProperty(False)
color_progress_background = ListProperty([0.035, 0.118, 0.149, 1])
min_pos = NumericProperty(0)
max_length = NumericProperty(0)
value = NumericProperty(0)
direction = OptionProperty('rl', options=['bt', 'tb', 'lr', 'rl'])
text_auto = BooleanProperty(True)
text = StringProperty('')
def get_text_label(self):
return self.ids['text_lbl']
def on_text(self, inst, val):
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_text_auto(self, inst, val):
self.ids['progress_image'].update_view()
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_value(self, inst, val):
self.ids['progress_image'].visible_percent = val
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (val,)
else:
self.ids['text_lbl'].text = self.text
def on_direction(self, inst, val):
self.ids['progress_image'].direction = val
def on_min_pos(self, inst, val):
self.ids['progress_image'].min_pos = val
def on_max_length(self, inst, val):
self.ids['progress_image'].max_length = val
def first_update(self):
self.ids['progress_image'].update_view()
if self.text_auto:
self.ids['text_lbl'].text = '%d %%' % (self.value,)
else:
self.ids['text_lbl'].text = self.text
def __init__(self, **kwargs):
Builder.load_string(kvstr)
super().__init__(**kwargs)
Clock.schedule_once(lambda dt: self.first_update(), 2.1)
if __name__ == '__main__':
from kivy.uix.boxlayout import BoxLayout
from kivy.app import App
appkvstr = """
#:import syringe shapes.syringe.info
#:import dna shapes.dna.info
#:import simple shapes.simple_tank.info
#:import graph shapes.graph.info
<Main@BoxLayout>:
orientation: 'horizontal'
padding: 10
BoxLayout:
orientation: 'vertical'
spacing: 5
ImageProgressBar:
source_front: 'shapes/simple_tank/front.png'
source_progress: 'shapes/simple_tank/back.png'
value: sldr.value
min_pos: simple.start
max_length: simple.length
direction: simple.direction
Slider:
id: sldr
max: 100
min: 0
"""
class Main(BoxLayout):
pass
class TestApp(App):
def __init__(self, **kwargs):
Builder.load_string(appkvstr)
super().__init__(**kwargs)
def build(self):
return Main()
TestApp().run()
我没有对此进行测试，但我认为您可以在某处创建一个 NumericProperty，并将其用于 ImageProgressBar 值。例如，在 Main class:
class Main(BoxLayout):
value = NumericProperty(0)
然后，在kv中可以参考上面的Property:
<Main@BoxLayout>:
orientation: 'horizontal'
padding: 10
BoxLayout:
orientation: 'vertical'
spacing: 5
ImageProgressBar:
source_front: 'shapes/simple_tank/front.png'
source_progress: 'shapes/simple_tank/back.png'
value: root.value # use the value from the Main class
min_pos: simple.start
max_length: simple.length
direction: simple.direction
那么你只需要更新Main的valueProperty，ImageProgressBar应该会自动更新。更新 value 属性 可以在单独的线程中完成，也许在循环中。