[feature request] UICenterOnChild Event Callback

[yuewah]

Is it possible to add an event callback after the panel is centered ?

[ArenMook]

I added that script as an example of how it can be done. Feel free to modify it or its copy to suit your needs. Adding an event should be trivial.

[yuewah]

I have updated to v2.2.2, where is the example code ?

[ArenMook]

I think you misunderstood what I meant. What I was trying to say is that the UICenterOnClick script was an example in response to a question that was asked fairly frequently. Adding a callback to be triggered at the end is a trivial task, so I simply suggested you modify that script or create a copy of it with the added callback.

[yuewah]

The UI with some dot indicator at the bottom used for level selection is quite common on mobile game. It make use of the callback event. I hope that NGUI will support it in the future.

[ArenMook]

The image link is broken to me.

[yuewah]

updated with another image url.

[yuewah]

@ArenMook, can you view the screenshot for the UI ?

[ArenMook]

Yup I see it.

[yuewah]

I think this UI design is quite common, for the dot indicator shown at the bottom correctly, onCenterFinished callback is necessary, would you add the following code to them main branch ?

1. public class UICenterOnChild : MonoBehaviour
2. {
3.  
4.         public delegate void OnCenterFinished();
5.         public OnCenterFinished onCenterFinished;
6.  
7.         public void Recenter()
8.         {
9.                 ...
10.                 SpringPanel springPanel = SpringPanel.Begin(mDrag.gameObject, dt.localPosition - offset, 8f);
11.                 springPanel.onSpringFinished = OnSpringFinished;
12.                 ...
13.         }
14.  
15.         void OnSpringFinished()
16.         {
17.                 if ( onCenterFinished != null )
18.                         onCenterFinished();
19.         }
20. }

1. public class SpringPanel : IgnoreTimeScale
2. {
3.         public delegate void OnSpringFinished();
4.         public OnSpringFinished onSpringFinished;
5.  
6.         void Update ()
7.         {
8.                 ...
9.                 if (mThreshold >= Vector3.Magnitude(after - target))
10.                 {
11.                         ...
12.                         if (onSpringFinished != null) onSpringFinished();
13.                 }
14.         }
15.  
16. }

[loverains]

 public void Recenter()
    {
        if (mDrag == null)
        {
            mDrag = UITools.FindInParents<UIDraggablePanel>(gameObject);

            if (mDrag == null)
            {
                Debug.LogWarning(GetType() + " requires " + typeof(UIDraggablePanel) + " on a parent object in order to work", this);
                enabled = false;
                return;
            }
            else
            {
                mDrag.onDragFinished = OnDragFinished;
            }
        }

this delegate why not use += operator?

[yuewah]

+= means adding multiple listeners, in this case, it is unnecessary.

[ArenMook]

Sure, I'll add it.

[seandanger]

+= means adding multiple listeners, in this case, it is unnecessary.

To be clear, += means to append a listener to the delegate list, instead of replacing them.  Using = overwrites any other listeners that may be attached to that delegate.

For that reason, I think this should be +=, I don't want my UIDraggablePanel's other delegates being overwritten by this component.