UICenterOnChild feature request

[Markov]

Hi!
I'm using UICenterOnChild to swipe between map lists in our game. This objects are big and if I want to see the next list I have to slide too much range (red arrow on picture). This is very invonvinient on tablets and PC.


May I ask you to add functionality in UICenterOnChild to set this range?(like on blue arrow)

[UncleAcid]

Add the following variables to UICenterOnChild:

1.     public bool allowFlickToNext = false;
2.     public float flickThreshold = 50f; // 50f has seemed to work well in my cases
3.  

and then replace the Recenter function with the following:

1.     public void Recenter ()
2.         {
3.                 if (mDrag == null)
4.                 {
5.                         mDrag = NGUITools.FindInParents<UIScrollView>(gameObject);
6.  
7.                         if (mDrag == null)
8.                         {
9.                                 Debug.LogWarning(GetType() + " requires " + typeof(UIScrollView) + " on a parent object in order to work", this);
10.                                 enabled = false;
11.                                 return;
12.                         }
13.                         else
14.                         {
15.                                 mDrag.onDragFinished = OnDragFinished;
16.                                
17.                                 if (mDrag.horizontalScrollBar != null)
18.                                         mDrag.horizontalScrollBar.onDragFinished = OnDragFinished;
19.  
20.                                 if (mDrag.verticalScrollBar != null)
21.                                         mDrag.verticalScrollBar.onDragFinished = OnDragFinished;
22.                         }
23.                 }
24.                 if (mDrag.panel == null) return;
25.  
26.                 // Calculate the panel's center in world coordinates
27.                 Vector3[] corners = mDrag.panel.worldCorners;
28.                 Vector3 panelCenter = (corners[2] + corners[0]) * 0.5f;
29.  
30.                 // Offset this value by the momentum
31.                 Vector3 pickingPoint = panelCenter - mDrag.currentMomentum * (mDrag.momentumAmount * 0.1f);
32.                 mDrag.currentMomentum = Vector3.zero;
33.  
34.                 float min = float.MaxValue;
35.                 Transform closest = null;
36.                 Transform trans = transform;
37.                 int index = 0;
38.  
39.                 // Determine the closest child
40.                 for (int i = 0, imax = trans.childCount; i < imax; ++i)
41.                 {
42.                         Transform t = trans.GetChild(i);
43.                         float sqrDist = Vector3.SqrMagnitude(t.position - pickingPoint);
44.  
45.                         if (sqrDist < min)
46.                         {
47.                                 min = sqrDist;
48.                                 closest = t;
49.                                 index = i;
50.                         }
51.                 }
52.                 if(allowFlickToNext && UICamera.currentTouch != null){
53.                         if(UICamera.currentTouch.totalDelta.x > flickThreshold && centeredObject.transform == trans.GetChild(index)){
54.                                 if(index - 1 >= 0){
55.                                         closest = trans.GetChild(index - 1);
56.                                 }
57.                         }
58.                         else if(UICamera.currentTouch.totalDelta.x < -flickThreshold && centeredObject.transform == trans.GetChild(index))
59.                         {
60.                                 if(index + 1 < trans.childCount){
61.                                         closest = trans.GetChild(index + 1);
62.                                 }
63.                         }
64.                 }
65.  
66.                 CenterOn(closest, panelCenter);
67.         }
68.  

All these changes do is check to see if you "flicked" the panel in either direction but didn't swipe (swiping far enough to center on a different child will result in default behaviour). If you "flicked"; the closest child will be the current child and so it sets the closest to the next or previous depending on flick direction.

[Markov]

Thank you UncleAcid!
I hope this changes will be in the next update too.

[ArenMook]

Thanks, UncleAcid. I've used your code as a guide to implement a similar solution. 3.0.7 will have a 'next page threshold' value you can set that works same as your flick threshold. If something other than zero, it will behave like your solution.

[UncleAcid]

Cool.

Glad I could contribute, no matter how small