I am writing a dragDirective. Eements are dragged in dragZones. On mouse releases I do a hitTest against all availabe dragZones. I am maintaining a static boolean flag which ends up being false if all hittests return false. In such a situation I would like to resposition the element in the dragZone it originally belonged to. How do I check against this change in variable value?

this._messageBus.listen("dragStart", (obj, event) => {
    DragZoneDirective.HITTEST = false;
}); 
this._messageBus.listen("dragStop", (obj, event) => {
    if (this.hitTest(event.x, event.y))
    {
        //clone object
        let clone: Object = JSON.parse(JSON.stringify(obj));
        this.dragZoneElems.push(clone);
        DragZoneDirective.HITTEST = true;
    }

    let index = this.dragZoneElems.indexOf(obj);
    if (index > -1)
        this.dragZoneElems.splice(index, 1);
});

angular2