Re: [Vala] global mouse pos / multitouch

["Gilzad Hamuni" <gilli4 gmx net>]

Hello,

a very basic answer to this would be the following example:


X.Display display = new X.Display();
X.Event event = X.Event();
X.Window window = display.default_root_window();

display.query_pointer(window, out window,
                out event.xbutton.subwindow, out event.xbutton.x_root,
                out event.xbutton.y_root, out event.xbutton.x,
                out event.xbutton.y, out event.xbutton.state);

print("Mouse Coordinates: " + event.xbutton.x.to_string() + "," + event.xbutton.y.to_string() + "\n");


I have derived the code from this example in C:
http://ubuntuforums.org/showpost.php?p=4110065&postcount=7

Also, the x11.vapi has to be extended by the following binding to make the code work:
[CCode (cname = "XQueryPointer")]
public bool query_pointer (Window w, out Window root_return, out Window child_return, out int root_x_return, 
out int root_y_return, out int win_x_return, out int win_y_return, out uint mask_return);


However, on multitouch devices it won't work. For some reason, the coordinates won't be passed to the 
application as soon as you place two or more fingers on the touchpad. I tested that temporarily in a silly 
loop.

Any idea how to approach for multitouch devices?


Thanks,

gilzad

-------- Original-Nachricht --------
> Datum: Tue, 05 Jun 2012 16:48:47 +0200
> Von: "Gilzad Hamuni" <gilli4 gmx net>
> An: vala-list gnome org
> Betreff: [Vala] global mouse pos / multitouch

> Hi all,
>
> I'm having a hard time finding out how to get the global mouse position in
> vala.
>
> Using Gtk, I was only able to get the coordinates inside a shown window.
> To use Xcb, I seem to be missing the knowledge about the required members.
> And using X11 bindings, I fail at the point, where I try to declare
> X.WindowAttributes, which I'd need to pass as a reference.
>
> Trying this..
>
> X.Display display = new X.Display();
> X.WindowAttributes windowAttributes;
> display.get_window_attributes(display.default_root_window(), out
> windowAttributes);
>
> .. the compiler (v0.17) says:
> mouse_position.vala.c:(.text+0x12e): undefined reference to
> `window_attributes_destroy'
>
> Ideally I'd use a library to receive many mouse positions at a time. I
> believe there should be a way as Gnome 2.30.2 already supports 2-finger
> scrolling. If not, my hope is that I'll be flooded with events for each finger.
> If I'm not totally wrong, uTouch would require a newer Gtk, so I can't use
> it.
>
> Thanks a bunch for any hint.
>
>
> gilzad
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