Re: mouse motion events after pointer reached screen border

[Luca Cappa <luca cappa i-medlab com>]

Hello David,

I think you could make the mouse pointer cursor invisible and when you 
detect a mouse movement (after you started somehow the "pan" process), 
just put the mouse in the original position: in this way you could move 
the mouse as long as you wish.

Using XLib in Linux, the code to set the mouse position could be:

       //
       //Place the mouse to the original position (i.e. to mPressPoint).
       Glib::RefPtr<Gdk::Window> lWin = get_window ();
       Window   win = GDK_WINDOW_XID (lWin->gobj ());
       Display *dpy = GDK_WINDOW_XDISPLAY (lWin->gobj ());
       XWarpPointer(dpy, None, win, 0, 0, 0, 0,
           mPressPoint.x,
           getWidgetSize ().y - mPressPoint.y - 1);

Hope this helps,
Luca

David Siegel wrote:

> Hi,
> I want to pan a bitmap in a drawing area. But I don't want the maximum
> pan distance to be limited by the screen size. Is there any way to make
> GTK emit mouse motion events after the pointer reached the screen border?
>
> Thanks for your help,
>
>        d
>
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