private static void EnsureEntryInLastMousePointerStates(Entity entity, MouseInteractionFeature feature)
{
if (!feature._lastEntityStates.ContainsKey(entity))
{
feature._lastEntityStates.Add(entity, MousePointerOverEntityState.Unknown);
}
}
private static bool IsLastMousePositionOverEntity(MouseInteractionFeature feature, Entity entity)
{
var transform = entity.GetImplementation <IReadOnlyTransform>();
// TODO check bounding box instead of value and check for overlapping entities
return(Vector3.Distance(transform.Position, feature._lastMousePosition) < 6.0f);
}
private static bool IsMousePointerLeavingEntity(Entity entity, MouseInteractionFeature feature, EngineUpdateEventArgs args)
{
var isLeaving = !IsLastMousePositionOverEntity(feature, entity) && feature._lastEntityStates[entity] == MousePointerOverEntityState.Over;
if (isLeaving)
{
feature._lastEntityStates[entity] = MousePointerOverEntityState.NotOver;
}
return(isLeaving);
}
private static MouseMoveOverEngineEventArgs CreateMouseMoveOverEventArgs(Entity entity, MouseInteractionFeature feature, EnginePointerMovedEventArgs args)
{
return(new MouseMoveOverEngineEventArgs(Engine.Current, feature._lastMousePosition));
}
private static IObservable <MouseEnterEngineEventArgs> CreateMouseEnterForEntity(Entity entity,
MouseInteractionFeature feature)
{
return(Engine.Current.Events.Update.Where(args => IsMousePointerEnteringEntity(entity, feature, args))
.Select(args => CreateMouseEnterEventArgs(entity, feature, args))
.Publish()
.RefCount());
}
private static bool IsMousePointerMovingOverEntity(Entity entity, MouseInteractionFeature feature, EnginePointerMovedEventArgs args)
{
var wasOver = feature._lastEntityStates[entity] == MousePointerOverEntityState.Over;
return(IsLastMousePositionOverEntity(feature, entity) && wasOver);
}
private static MouseLeaveEngineEventArgs CreateMouseLeaveEventArgs(Entity entity, MouseInteractionFeature feature, EngineUpdateEventArgs args)
{
return(new MouseLeaveEngineEventArgs(Engine.Current, feature._lastMousePosition));
}