[SOLVED] MouseWheel on linux

[Huhims]

how to generate MouseWheel (up/down) to outside of my program?
I can't find any clear examples for linux on internet.

for example:
i want to scroll firefox page with my program.
using timer for example.... ..

what I need to add to my project...
or no need to add anything..?


linux mint 19.3
lazarus 2.0.6
fpc3.0.4

[sash]

I have been done similar thing (but for joysticks) at the low level: basically you have to send messages to /dev/input/your-mouse-device (with uinput). But this probably requires (in addition to your app) root and/or some manipulations with udev rules.

Also, there should be something at x-server level, like X11/Xlib.

Alternatively you could use external application like xdotool. They say it can send events directly to interesting gui process.

[Huhims]

xdotool not really what I'd like, but it's better than nothing 
txnks bro!

procedure TForm1.Timer1Timer(Sender: TObject);
var
  Arg1 : Pchar = 'click 4';
begin
 SysUtils.ExecuteProcess(('/usr/bin/xdotool'), Arg1, []);
end;

works...

[sash]

xdotool not really what I'd like, but it's better than nothing 

Well, (probably) you could improve it, by not using external process: looks like there's `libxdo[-dev]` packages,
which (I think) actually contain needed api, if you know how to use C <-> Pascal bindings:

/usr/include/xdo.h - you need to translate header to Pascal (not all, but just few actually required functions, maybe some dependent structures)
/usr/lib/x86_64-linux-gnu/libxdo.so - you need to link it.