Button Long Press Event

[Shahadat Hossain]

Well I am trying to impalement a button which will change its text property on 5 second long press.

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.button import Button


class Home(App):
    def build(self):
        home_container = BoxLayout(orientation = 'vertical')
       
        display = Label(text = '12345')
        counter_button = Button(text = 'Counter')
       
        home_container.add_widget(display)
        home_container.add_widget(counter_button)
       
        return home_container
       

if __name__ == '__main__':
    home = Home()
    home.run()

when the Counter button will be long pressed for 5 seconds the text property will be changed to Reset. And then the Reset button will be used to call a function which will reset the displayed number to 0.

My question is, does Kivy buttons support long press events?

[Robert]

The Kivy Button https://github.com/kivy/kivy/blob/master/kivy/uix/button.py

inherits from ButtonBehavior  https://github.com/kivy/kivy/blob/master/kivy/uix/behaviors/button.py

where you see you can get both the press and release events.

I expect all you need to add is a 5 second timer to test against. 

FYI on a mobile device a long press is typically about 0.4 sec, but that does not mean that is appropriate in your application.

[Elliot Garbus]

Here is an example that can easily be extended to do what you  are looking for.  The example is a little sophisticated registering a new event and dispatching that event.  This is how I would implement it to simplify use in kv, but it is not required.

 

 

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.clock import Clock

kv = """
BoxLayout:
    orientation: 'vertical'
    Button:
        text: 'Regular Button'
    FiveSecondButton:
        text: 'Five Second Button'
        on_press: self.text = 'Pressed'
        on_release: self.text = 'Five Second Button'
        on_five_second_press: self.text = 'Very Long Press'
"""


class FiveSecondButton(Button):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.schedule = None
        self.register_event_type('on_five_second_press')

    def on_five_second_press(self):
        pass

    def on_press(self):
        self.schedule = Clock.schedule_once(self._long_press, 5)

    def _long_press(self, _):
        self.dispatch('on_five_second_press')

    def on_release(self):
        self.schedule.cancel()



class FiveSecondApp(App):
    def build(self):
        return Builder.load_string(kv)


FiveSecondApp().run()

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