Как использовать touchripple.py с Kivy Lang?

Question

Я пытаюсь создать кнопку, используя touchripple.py, найденный в kivy.uix.behaviors. Тем не менее, я оказался неудачным. Кто-нибудь может показать простой пример touchripple с кнопками, используя Kivy lang? Заранее спасибо. Теперь только волновой эффект не проявляется до сих пор. Пожалуйста посоветуй. Спасибо.

В rippleexample2.py:

from kivy.app import App
from kivy.uix.touchripple import TouchRippleBehavior
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import (StringProperty, NumericProperty, ObjectProperty,
ListProperty, DictProperty, BooleanProperty)

class RippleButton(TouchRippleBehavior, Button):
    isRippled = BooleanProperty(False)

    def __init__(self, **kwargs):
        super(RippleButton, self).__init__(**kwargs)

    def on_touch_down(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point and not self.isRippled:
            self.isRippled = True
            self.ripple_show(touch)
        return super(RippleButton, self).on_touch_down(touch)

    def on_touch_up(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point and self.isRippled:
            self.isRippled = False
            self.ripple_fade()
        return super(RippleButton, self).on_touch_up(touch)

    def doit(self, *args):
        print('in doit')

 class Login(Screen):
    pass

class MainScreen(Screen):
    pass

class ScreenManager(ScreenManager):
    pass

MainScreen = Builder.load_file("rippleexample2.kv")

class SimpleKivy4(App):
    def build(self):
        return MainScreen

if __name__ == "__main__":
    SimpleKivy4().run()

В rippleexample2.kv:

ScreenManager:
    Login:
    MainScreen:

<Login>:
    name:"login"
    RippleButton:
        text:'Login'
        font_size: 24
        on_release: app.root.current = "main"


<MainScreen>:
    name: "main"
    RippleButton:
        text: 'back'
        on_release: app.root.current = "login"

Answer 1

Ниже приведен фрагмент для создания кнопки, которая отображает анимацию пульсации касания при взаимодействии:

Отрывок

class RippleButton(TouchRippleBehavior, Button):

    def on_touch_down(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point:
            touch.grab(self)

            # The background_color (r, g, b, a) of button widget defaults to [1, 1, 1, 1]
            # where 'a' (alpha compositing or transparency) is 1 i.e. not transparent

            self.transparency = self.background_color[3]    # backup original transparency / alpha compositing
            self.background_color[3] = 0.5  # set transparency to half (0.5)

            self.ripple_show(touch)

            # dispatch on_press event because we have consumed on_touch_down
            self.dispatch('on_press')

            # consumed touch down and don’t want it to propagate any further.
            return True
        return False

    def on_touch_up(self, touch):
        if touch.grab_current is self:
            touch.ungrab(self)
            self.ripple_fade()

            # defer on_release until ripple_fade has completed
            def defer_release(dt):
                self.background_color[3] = self.transparency  # restore transparency / alpha compositing
                self.dispatch('on_release')

            Clock.schedule_once(defer_release, self.ripple_duration_out)

            # consumed touch up and don’t want it to propagate any further.
            return True
        return False

Пример

main.py

from kivy.app import App
from kivy.uix.behaviors.touchripple import TouchRippleBehavior
from kivy.uix.button import Button
from kivy.uix.screenmanager import Screen
from kivy.lang import Builder
from kivy.clock import Clock


class RippleButton(TouchRippleBehavior, Button):

    def on_touch_down(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point:
            touch.grab(self)

            # The background_color (r, g, b, a) of button widget defaults to [1, 1, 1, 1]
            # where 'a' (alpha compositing or transparency) is 1 i.e. not transparent

            self.transparency = self.background_color[3]    # backup original transparency / alpha compositing
            self.background_color[3] = 0.5  # set transparency to half (0.5)

            self.ripple_show(touch)

            # dispatch on_press event because we have consumed on_touch_down
            self.dispatch('on_press')

            # consumed touch down and don’t want it to propagate any further.
            return True
        return False

    def on_touch_up(self, touch):
        if touch.grab_current is self:
            touch.ungrab(self)
            self.ripple_fade()

            # defer on_release until ripple_fade has completed
            def defer_release(dt):
                self.background_color[3] = self.transparency  # restore transparency / alpha compositing
                self.dispatch('on_release')

            Clock.schedule_once(defer_release, self.ripple_duration_out)

            # consumed touch up and don’t want it to propagate any further.
            return True
        return False

    def doit(self, *args):
        print('in doit')


class Login(Screen):
    pass


class MainScreen(Screen):
    pass


class SimpleKivy4(App):
    def build(self):
        return Builder.load_file("main.kv")


if __name__ == "__main__":
    SimpleKivy4().run()

main.kv

#:kivy 1.11.0

ScreenManager:
    Login:
    MainScreen:

<Login>:
    name:"login"
    RippleButton:
        text:'Login'
        font_size: 24
        on_release: root.manager.current = "main"


<MainScreen>:
    name: "main"
    RippleButton:
        text: 'back'
        on_release: root.manager.current = "login"

выход

Answer 2

Посмотрев немного ближе к примеру, я заметил, что они делают странные вещи в RippleButton. Они прекратили отправку событий касания по неизвестной причине. Я изменил код, чтобы продолжить диспетчеризацию (поэтому теперь on_release должно работать). И я добавил BooleanProperty, чтобы отслеживать, действует ли TouchRipple Behavior.

from kivy.app import App
from kivy.lang import Builder
from kivy.properties import BooleanProperty
from kivy.uix.behaviors import TouchRippleBehavior
from kivy.uix.button import Button


class RippleButton(TouchRippleBehavior, Button):
    isRippled = BooleanProperty(False)

    def __init__(self, **kwargs):
        super(RippleButton, self).__init__(**kwargs)

    def on_touch_down(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point and not self.isRippled:
            self.isRippled = True
            self.ripple_show(touch)
        return super(RippleButton, self).on_touch_down(touch)

    def on_touch_up(self, touch):
        collide_point = self.collide_point(touch.x, touch.y)
        if collide_point and self.isRippled:
            self.isRippled = False
            self.ripple_fade()
        return super(RippleButton, self).on_touch_up(touch)

    def doit(self, *args):
        print('in doit')

theRoot = Builder.load_string('''
RippleButton:
    text: 'Click Here'
    on_release: self.doit()
''')

class TouchRippleApp(App):
    def build(self):
        return theRoot

if __name__ == '__main__':
    TouchRippleApp().run()