/// <summary>Finds an EventTarget from the given screen location.
/// This fires a ray into the scene if the point isn't on the main UI and caches the hit in the given pointer.
/// X and Y are updated with the document-relative point if it's on a WorldUI/ on the Unity UI.</summary>
public static EventTarget TargetFromPoint(ref float x,ref float y,InputPointer pointer){
Element result=null;
if(UI.document!=null){
// Test the main UI:
result=UI.document.elementFromPointOnScreen(x,y);
if(result!=null){
// Is it transparent or not html/body?
if(AcceptsInput(result)){
// Great, we're done!
if(pointer!=null){
pointer.LatestHitSuccess=false;
}
return result;
}
}
}
// Handle a Unity UI if needed.
Vector2 point;
#if HANDLE_UNITY_UI
if(UnityUICaster!=null){
// Try hitting the Unity UI first.
point=new Vector2(x,ScreenInfo.ScreenY-1-y);
HtmlDocument panelDoc=MapToUIPanel(ref point);
if(panelDoc!=null){
// Test for an element there:
result=panelDoc.elementFromPointOnScreen(point.x,point.y);
if(result!=null){
// Is it transparent?
// We're still checking a UI so we might still pass "through" it.
if(AcceptsInput(result)){
// Got a hit! Update x/y:
x=point.x;
y=point.y;
if(pointer!=null){
pointer.LatestHitSuccess=false;
}
return result;
}
}
}
}
#endif
// Go after WorldUI's next.
RaycastHit worldUIHit;
Camera cam=CameraFor3DInput;
if(cam==null){
// No camera!
if(pointer!=null){
pointer.LatestHitSuccess=false;
}
return null;
}
Vector2 screenPoint = new Vector2(x,ScreenInfo.ScreenY-1-y);
if(pointer == null){
// Cast into the scene now:
Ray ray=cam.ScreenPointToRay(screenPoint);
if(!Physics.Raycast(ray,out worldUIHit)){
// Nothing hit.
return null;
}
}else if(!pointer.Raycast(out worldUIHit,cam,screenPoint)){
// Nothing hit.
pointer.LatestHitSuccess=false;
return null;
}
// Cache it:
if(pointer!=null){
pointer.LatestHit=worldUIHit;
pointer.LatestHitSuccess=true;
}
// Did it hit a worldUI?
WorldUI worldUI=WorldUI.Find(worldUIHit);
if(worldUI==null){
// Nope! Get the eventTarget for the gameObject:
#if Enable3DInput
return worldUIHit.transform.gameObject.getEventTarget();
#else
return null;
#endif
}
// Resolve the hit into a -0.5 to +0.5 point:
// (we're ok to reuse x/y here):
worldUI.ResolvePoint(worldUIHit,out x,out y);
// Map it from a relative point to a 'real' one:
point=worldUI.RelativePoint(x,y);
// Apply to x/y:
x=point.x;
y=point.y;
// Pull an element from that worldUI:
return worldUI.document.elementFromPointOnScreen(x,y);
}
