omniverse_sample_scripts/Operation/Keyboard/InputKeyboard_ShowViewport.py at main · ft-lab/omniverse_sample_scripts · GitHub

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from pxr import Usd, UsdGeom, UsdSkel, UsdShade, Sdf, Gf, Tf

import carb
import carb.input
import carb.events
import omni.kit.app

# Reference:
# https://docs.omniverse.nvidia.com/kit/docs/kit-manual/latest/carb.input.html

# ------------------------------------------.
# Input with Keyboard.
# ------------------------------------------.
class InputKeyboard:
    _keyboard = None
    _input    = None
    _keyboard_subs = None
    _update_subs   = None
    _window = None
    _keyboard_input_value = ""

    def __init__(self):
        pass

    # Keyboard event.
    def _keyboard_event(self, event: carb.input.KeyboardEvent):
        if event.type == carb.input.KeyboardEventType.KEY_PRESS:
            self._keyboard_input_value = event.input
            print(f"KEY_PRESS : {event.input}")
        if event.type == carb.input.KeyboardEventType.KEY_RELEASE:
            print(f"KEY_RELEASE : {event.input}")
        return True

    # UI Update event.
    def _on_update(self, e: carb.events.IEvent):
        with self._window.frame:
            with omni.ui.VStack(height=0):
                with omni.ui.Placer(offset_x=20, offset_y=50):
                    # Set label.
                    f = omni.ui.Label(f"Input : {self._keyboard_input_value}")
                    f.visible = True
                    f.set_style({"color": 0xff00ffff, "font_size": 20})

    def startup(self):
        # Assign keyboard event.
        appwindow = omni.appwindow.get_default_app_window()
        self._keyboard = appwindow.get_keyboard()
        self._input    = carb.input.acquire_input_interface()
        try:
            self._keyboard_subs = self._input.subscribe_to_keyboard_events(self._keyboard, self._keyboard_event)
        except Exception:
            self._keyboard_subs = None

        # Get main window viewport.
        self._window = omni.ui.Window("Viewport")

        # Assing update event.
        try:
            self._update_subs = omni.kit.app.get_app().get_update_event_stream().create_subscription_to_pop(self._on_update, name="update")
        except Exception:
            self._update_subs = None

    def shutdown(self):
        # Release update event.
        if self._update_subs is not None:
            try:
                self._update_subs.unsubscribe()
            except Exception:
                pass

        # Release keyboard event.
        if self._input is not None and self._keyboard_subs is not None:
            try:
                self._input.unsubscribe_to_keyboard_events(self._keyboard, self._keyboard_subs)
            except Exception:
                pass

        self._keyboard_subs = None
        self._keyboard      = None
        self._input = None
        self._update_subs = None
        self._window = None

# -----------------------------------------.
keyboardV = InputKeyboard()
keyboardV.startup()

# stop.
#keyboardV.shutdown()