mousewheel (pad) lags / vertical scrolling

[MarcWeber]

This lags. Eg when moving 2 fingers on the laptopt trackpad it lags and keeps going. Using the scrollbar is fine (but slower to reach).
What I don't get is the manual running in browser is fine:
https://traineq.org/ImGuiBundle/emscripten/bin/demo_imgui_bundle.html

But it only feels that way on my linux machine not on Mac ?

If I look at the io.mousewheel output it feels like it the events lag behind and events come in while it renders next frames while I have long stopped touching the pad

I tried looking at the source and issues and google and AI but didn't find anything useful.

from imgui_bundle import imgui, immapp, hello_imgui, ImVec2
import time

from imgui_bundle.immapp.immapp_notebook import GuiFunction

# --- Configuration and Constants ---
WINDOW_WIDTH = 1200
WINDOW_HEIGHT = 800

LONG_TEXT = "a\n" * 5000


last = time.time()
def gui_app() -> None:
    global ii, last
    io = imgui.get_io()

    now = time.time()
    print( f"{now - last} {io.mouse_wheel}" )
    last = now

    if abs(io.mouse_wheel) > 0:
        return
    if abs(io.mouse_wheel_h) > 0:
        return

    imgui.text("Click on a tab to see the scrollable text content.")
    imgui.separator()

    window_flags = 0 # imgui.WindowFlags_.always_vertical_scrollbar

    if imgui.begin_tab_bar("My Tabs"):

        for i, x in enumerate(['A','B', 'C']):
            label = f"Tab {x}"

            is_open_tab, _ = imgui.begin_tab_item(label)
            if is_open_tab:
                imgui.begin_child(
                    label, 
                    ImVec2(0, 0), 
                    window_flags=window_flags
                )
                imgui.text_wrapped(LONG_TEXT) # text_wrapped ensures text flows within the child window
                imgui.end_child()
                imgui.end_tab_item()

        imgui.end_tab_bar()

def main():
    immapp.run(gui_app)

if __name__ == "__main__":
    main()

[pthom]

Hi,

I cannot reproduce your issue, either on Mac or on Linux. Could you try to disable idling

    hello_imgui.get_runner_params().fps_idling.enable_idling = False