Kivy event with keyboard

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Kivy event with keyboard

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#1 by (0 votes)

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I'm creating a piano with kivy is working fine, but just with the mouse click on the Button, I want to know how to do when typing a button the Button to be executed without having to click the mouse

from kivy.uix.button import Button
from kivy.app import App
from kivy.core.audio import SoundLoader
from kivy.uix.boxlayout import BoxLayout


class Piano(App):
    def build(self):
        c = Button(text='C',font_size=30,on_release=self.do)
        d = Button(text='D', font_size=30, on_release=self.re)
        e = Button(text='E', font_size=30, on_release=self.mi)
        f = Button(text='F', font_size=30, on_release=self.fa)
        g = Button(text='G', font_size=30, on_release=self.sol)
        a = Button(text='A', font_size=30, on_release=self.la)
        b = Button(text='B', font_size=30, on_release=self.si)
        box = BoxLayout()
        box.add_widget(c)
        box.add_widget(d)
        box.add_widget(e)
        box.add_widget(f)
        box.add_widget(g)
        box.add_widget(a)
        box.add_widget(b)
        return box'

    def do (self,c):
        som = SoundLoader.load('Songs/do.wav')
        som.play()
    def re (self,d):
        som = SoundLoader.load('Songs/re.wav')
        som.play()
    def mi (self,e):
        som = SoundLoader.load('Songs/mi.wav')
        som.play()
    def fa(self,f):
        som = SoundLoader.load('Songs/fa.wav')
        som.play()
    def sol (self,g):
        som = SoundLoader.load('Songs/sol.wav')
        som.play()
    def la (self,a):
        som = SoundLoader.load('Songs/la.wav')
        som.play()
    def si (self,b):
        som = SoundLoader.load('Songs/si.wav')
        som.play()




if __name__ in '__main__':
    Piano().run()

python teclado python-kivy

asked by anonymous 27.10.2017 / 19:44

1 answer

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score 0 · Answer 1

First, you'll need to import the Window class to your code:

from kivy.core.window import Window

So you can get keyboard events from the request_keyboard ". The first parameter of the method is a callback function that will be executed when the keyboard is closed; the second parameter is the object that will be associated with the keyboard. So, I believe you can do within your class:

class Piano(App):
    def build(self):

        self.keyboard = Window.request_keyboard(self.keyboard_closed, self)
        self.keyboard.bind(on_key_down=self.on_key_down)

        c = Button(text='C',font_size=30,on_release=self.do)
        d = Button(text='D', font_size=30, on_release=self.re)
        e = Button(text='E', font_size=30, on_release=self.mi)
        f = Button(text='F', font_size=30, on_release=self.fa)
        g = Button(text='G', font_size=30, on_release=self.sol)
        a = Button(text='A', font_size=30, on_release=self.la)
        b = Button(text='B', font_size=30, on_release=self.si)
        box = BoxLayout()
        box.add_widget(c)
        box.add_widget(d)
        box.add_widget(e)
        box.add_widget(f)
        box.add_widget(g)
        box.add_widget(a)
        box.add_widget(b)

        return box'

    def keyboard_closed(self):
        pass

The method return will be an instance of Keyboard , so you can bind to the on_key_down event for a method of your:

class Piano(App):
    def build(self):

        self.keyboard = Window.request_keyboard(self.keyboard_closed, self)

        c = Button(text='C',font_size=30,on_release=self.do)
        d = Button(text='D', font_size=30, on_release=self.re)
        e = Button(text='E', font_size=30, on_release=self.mi)
        f = Button(text='F', font_size=30, on_release=self.fa)
        g = Button(text='G', font_size=30, on_release=self.sol)
        a = Button(text='A', font_size=30, on_release=self.la)
        b = Button(text='B', font_size=30, on_release=self.si)
        box = BoxLayout()
        box.add_widget(c)
        box.add_widget(d)
        box.add_widget(e)
        box.add_widget(f)
        box.add_widget(g)
        box.add_widget(a)
        box.add_widget(b)

        return box'

    def keyboard_closed(self):
        pass

    def on_key_down(self, keyboard, keycode, text, modifiers):
        teclas = {
            "c": self.do,
            "d": self.re,
            "e": self.mi,
            "f": self.fa,
            "g": self.sol,
            "a": self.la,
            "b": self.si,
        }

        if keycode[1] in teclas:
            teclas[ keycode[1] ]()

So, when a key is pressed, the on_key_down method will be executed, checking if the key is one of the keys provided by the application and, if it is, executes the method that plays the audio.

Reference

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