Help: pointer passive motion

[syan]

Hi guys,

Can any one show me a simple example on how to detect the Mouse Passive Motion in X?

I tried to do it in the following event callback
function, but it failed to work properly:

---

void input(Widget w, XtPointer data, XtPointer cd){
if(cd->event->type==keyPress){
…
}
else if(cd->event->type==ButtonPress){
buttondown=True;
HandleMouse(w,cd);
}

else if(cd->event->type==ButtonRelease)
buttondown=False;

else if(cd->event->type==MotionNotify){
if(buttondown) HandleMouseMotion(w,cd);
else HandlePassiveMotion(w,cd);
}

---

It seems to me that the event type “MotionNotify” only includes “pointer motion event with a button down”. My problem is I don’t know how to modify this default behavior for the glxarea widget.

Any help is very much appreciated!

Thanks,

[shinpaughp]

Did you include PointerMotionMask in your event mask?

[KreK]

Alternatively, you can query mouse pointer outside the event loop like this:

    Window root;
    Window child;
    int root_x, root_y;
    int win_x, win_y;
    unsigned int button_mask;

    static int old_win_x;
    static int old_win_y;

    if( True == XQueryPointer(Interface::Window->GetDisplay(),
                              Interface::Window->GetWindow(),
                              &root, &child,
                              &root_x, &root_y,
                              &win_x, &win_y,
                              &button_mask) )
    {
        if( button_mask & Button1Mask ) // left button
        {
        }
        if( button_mask & Button3Mask ) // right button
        {
        }

        old_win_x = win_x;
        old_win_y = win_y;
    }
    else // outside window borders
    {
    }

In the above code, ‘Interface’ is my namespace for various singleton accessors.
I hope everything else is self-explanatory. You would do something like this on
per-frame basis.