could keyboard_callback response to key_pressed and key_up? and overwrite shortkeys of launch_passive

[furyNerd]

Intro

Hi!

below is my test code

import time
import mujoco
import mujoco.viewer

tmp_value = 0.0
is_pause = False

def key_callback(keycode):
    global tmp_value, is_pause
    if chr(keycode) == ' ': is_pause = not is_pause
    if (chr(keycode) == 'W'): tmp_value = 10.0


def main():
    global tmp_value, is_pause
    
    model = mujoco.MjModel.from_xml_path('scene.xml')
    data = mujoco.MjData(model)

    with mujoco.viewer.launch_passive(model, data, key_callback=key_callback) as viewer:
        while viewer.is_running():
            step_start = time.time()
            


            data.ctrl = [ 0,0,0,0,
                          0,0,0,0,
                          0,0,0,0]
            data.ctrl[-1] = -tmp_value

            if not is_pause:
                mujoco.mj_step(model, data)
                viewer.sync()

            time_until_next_step = model.opt.timestep - (time.time() - step_start)
            if time_until_next_step > 0:
                time.sleep(time_until_next_step)

if __name__ == "__main__":
    main()

i got two question:

1. by using a simple launch_passive, is there a way to response to key_pressed or key_release event?
   by which , i wish tmp_value is 10.0 when w is keeping pressed, while when w is released the tmp_value could reset to 0.0;
   the code i presented looks like when w is stroke, tmp_value is set to be 10.0 forever.

2. by launch_passive, the mujoco GUI binds some default shorkeys, like w is a swither for opengl wireframe. how could i overwrite these shortkeys?

i found Projectile Game( as #741 (comment) suggusted ) could address Q2 but Q1 still unsolved, and a little bit of complicated for a quick setup usecase.

so i'm hope if there is a simple and lightweight solution(maybe a thread to listen to keys for Q1)? thanks very much for any advice.

My setup

mujoco 3.3.7, python 3.13.0, win11