My App have a Timer as a data in recycleview that will be updating to change the text of the timer each second. So I used Clock to call timer_update function every one second to update the time.
The issue is that the Timer text is updated when print on a terminal, but is not updating on the App screen.
Here is my code:
import datetime
from kivy.clock import Clock
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.properties import StringProperty
from kivymd.uix.boxlayout import MDBoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
Builder.load_string( '''
<Timer>:
orientarion: 'vertical'
md_bg_color: 0, 0, 1, 1
MDLabel:
text: root.text
color: 1,1,1,1
halign: 'center'
<MyLayout>:
MDBoxLayout:
orientation: 'vertical'
RecycleView:
id: rv
key_viewclass: 'viewclass'
key_size: 'height'
effect_cls: 'ScrollEffect'
RecycleBoxLayout:
padding: dp(10)
size_hint_y: None
default_size: None, dp(60)
default_size_hint: 1, None
height: self.minimum_height
orientation: 'vertical'
''')
class Sm(ScreenManager):
pass
class Timer(MDBoxLayout):
text = StringProperty()
class MyLayout(Screen):
def on_enter(self):
self.add_timer()
Clock.schedule_interval(self.update_timer, 1)
def update_timer(self, dt):
self.ids.rv.data[0]['text'] = str(datetime.datetime.now())
print(self.ids.rv.data[0]['text'])
def add_timer(self):
self.ids.rv.data.append(
{
"viewclass": "Timer",
"text": str(datetime.datetime.now()),
"callback": lambda x: x,
}
)
class MyApp(MDApp):
def build(self):
sm = Sm()
sm.add_widget(MyLayout())
return sm
MyApp().run()
CodePudding user response:
if you call self.ids.rv.refresh_from_data()
after updating your data should do the trick.
Full example:
import datetime
from kivy.clock import Clock
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.properties import StringProperty
from kivymd.uix.boxlayout import MDBoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
Builder.load_string( '''
<Timer>:
orientarion: 'vertical'
md_bg_color: 0, 0, 1, 1
MDLabel:
text: root.text
color: 1,1,1,1
halign: 'center'
<MyLayout>:
MDBoxLayout:
orientation: 'vertical'
RecycleView:
id: rv
key_viewclass: 'viewclass'
key_size: 'height'
effect_cls: 'ScrollEffect'
RecycleBoxLayout:
padding: dp(10)
size_hint_y: None
default_size: None, dp(60)
default_size_hint: 1, None
height: self.minimum_height
orientation: 'vertical'
''')
class Sm(ScreenManager):
pass
class Timer(MDBoxLayout):
text = StringProperty()
class MyLayout(Screen):
def on_enter(self):
self.add_timer()
Clock.schedule_interval(self.update_timer, 1)
def update_timer(self, dt):
self.ids.rv.data[0]['text'] = str(datetime.datetime.now())
self.ids.rv.refresh_from_data()
print(self.ids.rv.data[0]['text'])
def add_timer(self):
self.ids.rv.data.append(
{
"viewclass": "Timer",
"text": str(datetime.datetime.now()),
"callback": lambda x: x,
}
)
class MyApp(MDApp):
def build(self):
sm = Sm()
sm.add_widget(MyLayout())
return sm
MyApp().run()