[SOLVED] MouseWheel on linux
lazarus / 32-Linux

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Huhims · 2020-02-10 17:58

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

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sash · 2020-02-12 22:20

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.

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Huhims · 2020-02-17 17:57

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...

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sash · 2020-02-18 11:42

Quote from: Huhims on February 17, 2020, 06:57:16 pmxdotool 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.