[kivy-users] Keyboard events on_key_up (down) parameters

[Mr. Mog]

Hello,

What are the types for the keyboard events on_key_up & on_key_down parameters (keycode, internal, modifiers)?

[Robert]

Try for example:   print(type(keycode))

[Mr. Mog]

How do I even use the Vkeyboard?

My try:

from kivy.app import App

from kivy.lang import Builder

from kivy.uix.boxlayout import BoxLayout

from plyer import vibrator

from kivy.uix.vkeyboard import VKeyboard

from kivy.uix.textinput import TextInput

class MyWid(BoxLayout):

pass

class MyKBoard(VKeyboard):

c = 1

def on_key_up(self, *largs):

for i in largs:

print(f"[count {self.c}] {i} is of {type(i)} type")

self.c += 1

super().on_key_up(largs)

class MyApp(App):

def build(self):

box = MyWid(orientation="vertical")

kb = MyKBoard(size_hint=[.8, .5])

input = TextInput(keyboard=kb)

box.add_widget(input)

box.add_widget(kb)

return box

MyApp().run()

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[Elliot Garbus]

You do NOT use the Vkeyboard directly as described here:  https://kivy.org/doc/stable/api-kivy.uix.vkeyboard.html?highlight=vkeyboard#module-kivy.uix.vkeyboard

 

To Request the keyboard see:

See: https://kivy.org/doc/stable/api-kivy.core.window.html#kivy.core.window.Keyboard

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[Mr. Mog]

Please can you help me with a minimum example?

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[Elliot Garbus]

The example below, uses the Config object to bring up the virtual keyboard.  Clicking on the left side of the screen outside of the TextInput will cause the VKeyboard to close.  Clicking on the text input or the right side of the screen will cause the virtual keyboard to open.  Pressing spacebar, up, left or right, will cause the appropriate section on the right side of the screen to highlight.

 

Note I have set the ids on the KeyLabels to match the keycodes to simplify the code.

 

from kivy.config import Config
# must be before kivy.app loads, this will use the kivy virtual & system keyboard
Config.set('kivy', 'keyboard_mode', 'systemanddock')

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout

from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.properties import NumericProperty


kv = """
<KeyLabel>:
    canvas:
        Color:
            rgb: .5, .5, .5
        Line:
            width: 2
            rectangle: (*self.pos, *self.size)
    canvas:
        Color:
            rgba: .3, .3, .3, root.down_opacity
        Rectangle:
            pos: self.pos
            size: self.size
    
BoxLayout:
    RelativeLayout:
        orientation: 'vertical'
        TextInput:
            hint_text: 'Enter Name Here'
            size_hint: .7, None
            height: 30
            pos_hint: {'center_x': 0.5, 'center_y': 0.5}
    RightSideLayout:
        orientation: 'vertical'
        Label:
            text: 'Click on this side to capture keys'
            size_hint_y: None
            height: 48
        GridLayout:
            padding: 10
            size_hint_y: None
            height: 48 * 2
            cols: 3
            rows: 2
            KeyLabel:
            KeyLabel:
                id: up
                text: 'Up'
            KeyLabel:
            KeyLabel:
                id: left
                text: 'Left'
            KeyLabel:
                id: spacebar
                text: 'Spacebar'
            KeyLabel:
                id: right
                text: 'Right'
        Label:
"""


class KeyLabel(Label):
    down_opacity = NumericProperty()


class RightSideLayout(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self._keyboard = None

    def on_touch_down(self, touch):
        if self.collide_point(*touch.pos):
            self._keyboard = Window.request_keyboard(self._keyboard_closed, self)
            self._keyboard.bind(on_key_down=self._on_keyboard_down)
            self._keyboard.bind(on_key_up=self._on_keyboard_up)
            print('Keyboard Opened')
            return True
        return False

    def _keyboard_closed(self):
        print('Keyboard Closed')
        self._keyboard.unbind(on_key_down=self._on_keyboard_down)
        self._keyboard.unbind(on_key_up=self._on_keyboard_up)
        self._keyboard = None

    def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
        key = keycode[1]
        print(f'{key} pressed')
        if key in ['left', 'right', 'up', 'spacebar']:
            app = App.get_running_app()
            app.root.ids[key].down_opacity = .5

    def _on_keyboard_up(self, keyboard, keycode):
        key = keycode[1]
        print(f'{key} released')
        if key in ['left', 'right', 'up', 'spacebar']:
            app = App.get_running_app()
            app.root.ids[key].down_opacity = 0


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


KeysApp().run()

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