Errors when trying to implement Second Screen to Clock App
Abraham Francisco
from time import strftime
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.clock import Clock
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
import os
kv = """
BoxLayout:
orientation: 'vertical'
MyClock:
font_size: 50
id:my_clock
Button:
text: 'Set Alarm'
on_press: aggro_alarm.screen_manger.current = "SetAlarmPage"
"""
class MyClock(Label):
pass
class SetAlarmButton(Label):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.set_alarm = Button(text="Set Alarm")
# self.set_alarm.bind(on_press=)
self.add_widget(Label())
self.add_widget(self.set_alarm)
class MainApp(App):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.SetAlarmPage = SetAlarmPage()
self.screen_manager = ScreenManager()
self.home_screen = Builder.load_string(kv)
def build(self):
screen = Screen(name='Home')
screen.add_widget(self.home_screen)
self.screen_manager.add_widget(screen)
screen = Screen(name="SetAlarmPage")
screen.add_widget(self.SetAlarmPage)
self.screen_manager.add_widget(screen)
return self.screen_manager
def on_start(self):
t = strftime("%I:%M:%S %p")
self.root.ids.my_clock.text = t
Clock.schedule_interval(self.update_time, 1)
def update_time(self, dt):
t = strftime("%I:%M:%S %p")
self.root.ids.my_clock.text = t
class SetAlarmPage(GridLayout):
def __init__(self, *args, **kwargs):
super().__init__(**kwargs)
self.cols = 2
self.add_widget(Label(text="Alarm 1:"))
self.A1 = TextInput(multiline=False)
self.add_widget(self.A1)
if __name__ == "__main__":
aggro_alarm = MainApp()
aggro_alarm.run()
I'm trying to pull up "SetAlarmPage" from the button in kv on press. Now on load of the app I get this error:
File "kivy\properties.pyx", line 860, in kivy.properties.ObservableDict.__getattr__
KeyError: 'my_clock'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:/Users/Owner/PycharmProjects/Aggro-Alarm/main.py", line 80, in <module>
aggro_alarm.run()
File "C:\Users\Owner\Anaconda3\envs\Aggro-Alarm\lib\site-packages\kivy\app.py", line 854, in run
self.dispatch('on_start')
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:/Users/Owner/PycharmProjects/Aggro-Alarm/main.py", line 60, in on_start
self.root.ids.my_clock.text = t
File "kivy\properties.pyx", line 863, in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
What is this error trying to tell me? And ultimately, what should I do to be able to pull up a second screen with hopefully still keeping the kv string layout.
Elliot Garbus
SetAlarmPage needs to be a Screen not a GridLayout. You can do more of this in kivy.
Here is an example of switching screens:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.clock import Clock
from kivy.properties import StringProperty
from time import strftime
kv = """
<Home@Screen>:
BoxLayout:
MyClock:
font_size: 50
text: self.current_time
on_release: app.root.ids.sm.current = 'alarm_page'
<AlarmPage@Screen>:
Button:
text: 'Put alarms on this page'
on_release: app.root.ids.sm.current = 'home_page'
BoxLayout:
ScreenManager:
id: sm
Home:
name: 'home_page'
AlarmPage:
name: 'alarm_page'
"""
class MyClock(Button):
current_time = StringProperty(strftime("%I:%M:%S %p"))
def __init__(self, **kwargs):
Clock.schedule_interval(self.update_time, 1)
super().__init__(**kwargs)
def update_time(self, dt):
self.current_time = strftime("%I:%M:%S %p")
class MainApp(App):
def build(self):
return Builder.load_string(kv)
if __name__ == "__main__":
MainApp().run()
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Abraham Francisco
Elliot Garbus
In the code there is one button on the screen the size of the screen. Use layouts to add other widgets.
For example:
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.clock import Clock
from kivy.properties import StringProperty
from time import strftime
kv =
"""
<Home@Screen>:
BoxLayout:
orientation: 'vertical'
MyClock:
size_hint_y: .75
font_size: 50
text: self.current_time
Button:
size_hint_y: .25
text: 'Change to Alarm Page'
font_size: 50
on_release: app.root.ids.sm.current = 'alarm_page'
<AlarmPage@Screen>:
Button:
text: 'Put alarms on this page'
on_release: app.root.ids.sm.current = 'home_page'
BoxLayout:
ScreenManager:
id: sm
Home:
name: 'home_page'
AlarmPage:
name: 'alarm_page'
"""
class MyClock(Label):
current_time = StringProperty(strftime("%I:%M:%S %p"))
def __init__(self, **kwargs):
Clock.schedule_interval(self.update_time, 1)
super().__init__(**kwargs)
def update_time(self, dt):
self.current_time = strftime("%I:%M:%S %p")
class MainApp(App):
def build(self):
return Builder.load_string(kv)
if __name__ == "__main__":
MainApp().run()
From: Abraham Francisco
Sent: Saturday, April 11, 2020 2:50 PM
To: Kivy users support
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Abraham Francisco
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Elliot Garbus
A Button uses 4 images to define the look of the button. You can change the color of the button by replacing those images or by using background color. To change the color of the button when the button is pressed you the button state (‘normal’ or ‘down’ to select the color.
Example:
from kivy.app import App
from kivy.lang import
Builder
kv = """
# set your colors for normal and down position of the button
#:set normal_color (.5, .5, .4, 1)
#:set down_color (0, 0, .3, 1)
<FlatButton@Button>:
background_color: {'normal': normal_color, 'down': down_color}[self.state] # this is a dict, state is 'normal or 'down'
background_down: '' # The standard button uses 4 bitmaps to define the look
background_normal: ''
background_disabled_normal: ''
background_disabled_down: ''
BoxLayout:
orientation: 'vertical'
spacing: 2
padding: 5
FlatButton:
text: "Hello, I'm a FlatButton"
FlatButton:
text: 'Press me'
Button:
text: 'Normal Button'
Button:
text: 'Disabled Button'
disabled: True
"""
class FlatButtonApp(App):
def build(self):
return Builder.load_string(kv)
FlatButtonApp().run()
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Abraham Francisco
from kivy.app import App
from kivy.lang import Builder
kv = """
# set your colors for normal and down position of the button
#:set normal_color (.5, .5, .4, 1)
#:set down_color (0, 0, .3, 1)
#:set disabled_normal_color (0, .4, .6, 1)
<FlatButton@Button>:
background_color: {'normal': normal_color, 'down': down_color, 'disabled_normal': disabled_normal_color}[self.state] # this is a dict, state is 'normal or 'down'
background_down: '' # The standard button uses 4 bitmaps to define the look
background_normal: ''
background_disabled_normal: ''
background_disabled_down: ''
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Elliot Garbus
The button state is either normal or down. Disabled is a Boolean and will be True or False.
Keeping it all in kv:
background_color: {'normal': normal_color, 'down': down_color}[self.state] if not self.disabled else {'normal': disabled_normal_color, ‘down’: disabled_down_color} [self.state]
This uses a ternary expression. The format is:
color = x if y else z
this is the same as:
if(x):
color = x
else:
color = y
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Elliot Garbus
Oops…
This uses a ternary expression. The format is:
color = x if y else z
this is the same as:
if(y):
color = x
else:
color = z
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Abraham Francisco
To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/5ea37eac.1c69fb81.2a6fb.2eacSMTPIN_ADDED_MISSING%40gmr-mx.google.com.
Elliot Garbus
To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/CAG4TV44P-EK4upb_3faPNs-jYKbnXagv5rdRZW7Lm-mb4ibA5g%40mail.gmail.com.