Tablet Events Not Captured in ManimGL Window

[aguemoug]

Discussed in #2290

^{Originally posted by aguemoug January 2, 2025}
Hellow
I am attempting to add support for graphic tablets as an input method in ManimGL. While tablet events (e.g., pen pressure, tilt) are successfully captured in a standalone Pyglet window, I am unable to capture these events within the ManimGL window.

It seems that ManimGL's custom window or event loop configuration might be interfering with the propagation of tablet-related events.

Working Example

Below is a working example using a standalone Pyglet window to capture tablet input events.

import pyglet

# Create a resizable window for the whiteboard
window = pyglet.window.Window(800, 600, "Whiteboard", resizable=True)

def on_enter(cursor):
    print(f"Cursor entered: {cursor}")

def on_leave(cursor):
    print(f"Cursor left: {cursor}")

def on_motion(cursor, x, y, pressure, tilt_x, tilt_y, rotation):
    if pressure > 0.2:  # Only log events with significant pressure
        print(f"Motion detected - x: {x}, y: {y}, pressure: {pressure}, tilt: ({tilt_x}, {tilt_y}), rotation: {rotation}")

tablets = pyglet.input.get_tablets()

if tablets:
    tablet = tablets[0]
    tablet = tablet.open(window)
    tablet.event(on_motion)
    tablet.event(on_enter)
    tablet.event(on_leave)
else:
    print("No tablet device found. Please connect a tablet.")

pyglet.app.run()

Non-Working Example

Below is a non-working example where tablet events are not captured in a ManimGL-based window.

class Window(PygletWindow):
    fullscreen: bool = False
    resizable: bool = True
    gl_version: tuple[int, int] = (3, 3)
    vsync: bool = True
    cursor: bool = True

    def __init__(
        self,
        scene: Optional[Scene] = None,
        position_string: str = "UR",
        monitor_index: int = 1,
        full_screen: bool = False,
        size: Optional[tuple[int, int]] = None,
        position: Optional[tuple[int, int]] = None,
        samples: int = 0
    ):
        self.scene = scene
        self.monitor = self.get_monitor(monitor_index)
        self.default_size = size or self.get_default_size(full_screen)
        self.default_position = position or self.position_from_string(position_string)
        self.pressed_keys = set()

        super().__init__(samples=samples)
        self.to_default_position()

        # Enable tablet
        tablets = pyglet.input.get_tablets()

        if tablets:
            tablet = tablets[0]
            self.tablet = tablet.open(self._window)
            self.tablet.event(self.on_motion)
            self.tablet.event(self.on_enter)
            self.tablet.event(self.on_leave)
            print("Tablet initialized!")
        else:
            self.tablet = None

        if self.scene:
            self.init_for_scene(scene)

    def on_enter(self, cursor):
        print(f"Cursor entered: {cursor}")

    def on_leave(self, cursor):
        print(f"Cursor left: {cursor}")

    def on_motion(self, cursor, x, y, pressure, tilt_x, tilt_y, rotation):
        if pressure > 0.2:
            print(f"Motion detected - x: {x}, y: {y}, pressure: {pressure}, tilt: ({tilt_x}, {tilt_y}), rotation: {rotation}")

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