koobas.hobune.stream
How can I get UI element over which pointer is in Unity3D?
I can detect if mouse is hovering any UI element by EventSystem.current.IsPointerOverGameObject().
But how do I know which GameObjest it is exactly?
I have tried:
if (EventSystem.current.IsPointerOverGameObject())
foreach (GameObject go in new PointerEventData(EventSystem.current).hovered)
print(go.name);
But in every moment new PointerEventData(EventSystem.current).hovered is empty whether I hover or not.
I can see required info using print(EventSystem.current);:
<b>Selected:</b>
<b>Pointer Input Module of type: </b>UnityEngine.EventSystems.StandaloneInputModule
<B>Pointer:</b> -1
<b>Position</b>: (746.0, 535.0)
<b>delta</b>: (60.0, -44.0)
<b>eligibleForClick</b>: False
<b>pointerEnter</b>: cursorInfoText (UnityEngine.GameObject)
<b>pointerPress</b>:
<b>lastPointerPress</b>:
<b>pointerDrag</b>:
<b>Use Drag Threshold</b>: True
<b>Current Rayast:</b>
Name: cursorInfoText (UnityEngine.GameObject)
module: Name: Canvas (UnityEngine.GameObject)
eventCamera:
sortOrderPriority: 0
renderOrderPriority: 0
module camera: null
distance: 0
index: 0
depth: 1
worldNormal: (0.0, 0.0, 0.0)
worldPosition: (0.0, 0.0, 0.0)
screenPosition: (746.0, 535.0)
module.sortOrderPriority: 0
module.renderOrderPriority: 0
sortingLayer: 0
sortingOrder: 0
<b>Press Rayast:</b>
<B>Pointer:</b> -2
<b>Position</b>: (746.0, 535.0)
<b>delta</b>: (60.0, -44.0)
<b>eligibleForClick</b>: False
<b>pointerEnter</b>: cursorInfoText (UnityEngine.GameObject)
<b>pointerPress</b>:
<b>lastPointerPress</b>:
<b>pointerDrag</b>:
<b>Use Drag Threshold</b>: True
<b>Current Rayast:</b>
Name: cursorInfoText (UnityEngine.GameObject)
module: Name: Canvas (UnityEngine.GameObject)
eventCamera:
sortOrderPriority: 0
renderOrderPriority: 0
module camera: null
distance: 0
index: 0
depth: 1
worldNormal: (0.0, 0.0, 0.0)
worldPosition: (0.0, 0.0, 0.0)
screenPosition: (746.0, 535.0)
module.sortOrderPriority: 0
module.renderOrderPriority: 0
sortingLayer: 0
sortingOrder: 0
<b>Press Rayast:</b>
<B>Pointer:</b> -3
<b>Position</b>: (746.0, 535.0)
<b>delta</b>: (60.0, -44.0)
<b>eligibleForClick</b>: False
<b>pointerEnter</b>: cursorInfoText (UnityEngine.GameObject)
<b>pointerPress</b>:
<b>lastPointerPress</b>:
<b>pointerDrag</b>:
<b>Use Drag Threshold</b>: True
<b>Current Rayast:</b>
Name: cursorInfoText (UnityEngine.GameObject)
module: Name: Canvas (UnityEngine.GameObject)
eventCamera:
sortOrderPriority: 0
renderOrderPriority: 0
module camera: null
distance: 0
index: 0
depth: 1
worldNormal: (0.0, 0.0, 0.0)
worldPosition: (0.0, 0.0, 0.0)
screenPosition: (746.0, 535.0)
module.sortOrderPriority: 0
module.renderOrderPriority: 0
sortingLayer: 0
sortingOrder: 0
<b>Press Rayast:</b>
By the way why are there 3 pointers (-1, -2, -3) and what does this mean? I've read somewhere in docs, pointer -1 is left mouse button, but I click nothing, so this is weird.
I can see <b>pointerEnter</b>: cursorInfoText (UnityEngine.GameObject) and Name: cursorInfoText (UnityEngine.GameObject) which is what I need. But how do I extract this info? I have tried print(new PointerEventData(EventSystem.current).pointerEnter);, but it is Null doesn't matter I enter or hover. And I see no other appropriate methods or properties in docs, although I can see that info is stored. I've tried EventSystem.current.currentSelectedGameObject too and it always returns Null as well. What have I missed?
My goal is to detect if mouse is hovering UI element with some conditions (ignore small amount of UI elements (likely by tag) and don't ignore the rest (most of elements)), so I have to get GameObject itself. And if mouse doesn't hover UI element (except those few), script does unrelated to UI stuff. But do not ignore if it hovers one of those few and one of the rest at the same time.
Unity 5.3.4.
Simply newing up a PointerEventData object will not initialize it with the actual data you're looking for. It sounds to me like you're wanting to get the PointerEventData from your current input module. Problem is that the relevant input module members are not publicly exposed - but they do have protected access, so you can derive your own input module and expose them that way. For example, if you're using the default StandaloneInputModule:
using UnityEngine.EventSystems;
public class ExtendedStandaloneInputModule : StandaloneInputModule
{
public static PointerEventData GetPointerEventData(int pointerId = -1)
{
PointerEventData eventData;
_instance.GetPointerData(pointerId, out eventData, true);
return eventData;
}
private static ExtendedStandaloneInputModule _instance;
protected override void Awake()
{
base.Awake();
_instance = this;
}
}
Use something like the above to replace the input module in your EventSystem object (may have to set "Force Module Active" for it to work), and you can call the static ExtendedStandaloneInputModule.GetPointerEventData() method to get proper PointerEventData objects from it. In your case you will likely be wanting to look at the hovered member which is a List<GameObject> of objects in the hover stack.
The EventSystem keeps a dictionary of PointerEventData objects keyed by pointer ids, where the pointer ids refer to specific pointer events: -1, -2, and -3 are left, right, and middle mouse buttons; and I believe 1, 2, 3+ refer to first, second, third, touch input fingers, etc. but I'm not too familiar with touch controls. I'm assuming any mouse button pointer id will yield the hovered members you'll be interested in, if not then at least the default -1 pointer id should work.
Hope that helps!
Try this in your foreach loop
if(go.gameobject == this.gameobject) { // go.gameobject is not the UI element you are hovering over }
