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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
/// <summary>
/// This class handles displaying Fact tooltips, when hovering over a fact in the Gameworld
/// </summary>
public class WorldFactInteraction : MonoBehaviour
{
[SerializeField] private LayerMask factLayerMask;
[SerializeField] private Transform HidingCanvas;
private GameObject currentDisplay;
private Transform lastHit = null;
private bool canRun = false;
private void Update()
{
// disable this script if HidingCanvas does not render
canRun = HidingCanvas.GetComponent<Canvas>().enabled;
}
void LateUpdate()
{
if (currentDisplay != null && currentDisplay.GetComponent<DragHandling>().dragged)
{
// currently dragging -> remove transparency to indicate dragging and let DragHandling.cs take over
currentDisplay.GetComponent<CanvasGroup>().alpha = 1;
return;
}
UpdateDisplay();
}
private void UpdateDisplay()
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
// if no fact was hit or pointer was over other UI
if (!Physics.Raycast(ray, out RaycastHit hit, Mathf.Infinity, factLayerMask) || WasOtherUIHit())
// destroy currentDisplay if it exists
Destroy(currentDisplay);
return;
}
FactObject factObj = hit.transform.gameObject.GetComponentInChildren<FactObject>();
if (factObj == null)
{
// should never happen, if the layerMask is set up correctly
Tobias Schöner
committed
Debug.LogError("WorldFactInteraction Raycast collided with object in factLayerMask, that did not contain a FactObject script: " + hit.transform.gameObject.name);
Destroy(currentDisplay);
return;
}
if (hit.transform != lastHit) // a fact has been hit for the first time -> delete old display and instantiate new one
{
InstantiateNewDisplay(factObj);
}
currentDisplay.transform.position = Input.mousePosition; // move currentDisplay to mousePosition
currentDisplay.GetComponent<CanvasGroup>().alpha = 0.5f; // ensure that image alpha is correct, since it could have changed due to dragging
lastHit = hit.transform;
}
private void InstantiateNewDisplay(FactObject factObj)
{
if (currentDisplay)
Destroy(currentDisplay);
Fact fact = StageStatic.stage.factState[factObj.URI];
// TODO: this link to DisplayFacts is not ideal: maybe refactor to SciptableObject or such
currentDisplay = fact.instantiateDisplay(DisplayFacts.prefabDictionary[fact.GetType()], HidingCanvas);
}
#region Helper
/// <summary>
/// Returns true if any UI other than currentDisplay was hit
/// </summary>
/// <returns></returns>
private bool WasOtherUIHit()
{
PointerEventData pointerData = new(EventSystem.current)
{
position = Input.mousePosition
};
List<RaycastResult> results = new();
EventSystem.current.RaycastAll(pointerData, results);
foreach (var res in results)
if (currentDisplay == null || !res.gameObject.transform.IsChildOf(currentDisplay.transform))
return true;
return false;
}
#endregion Helper
}