Like iphone confirmation slider

yes,this is my modif start at linenums 310

    if(hor) {
        //knob_area->x1 -= (knob_size >> 1);
        knob_area->x1 -= (knob_size );
        if (knob_area->x1 < obj->coords.x1)
            knob_area->x1 = obj->coords.x1;
        knob_area->x2 = knob_area->x1 + knob_size - 1;
        knob_area->y1 = obj->coords.y1;
        knob_area->y2 = obj->coords.y2;
    }
    else {
        
       // knob_area->y1 -= (knob_size >> 1);
        knob_area->y1 -= (knob_size );
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