BUG: "Enabled" state is not properly inherited with alpha in nested UIPanels

[Edy]

NGUI 3.0.8 f7

Alpha is nicely inherited in any nested components. However the "enabled" state due to alpha=0 is not transmitted properly in nested UIPanels.

Easy to repro:

• Open the NGUI example scene "Example 7 - Scroll View (Panel)"
• Hierarchy: UI Root (2D) > Window Panel > Scroll View > UIGrid
• Give all items inside UIGrid an UIPlaySound component (multiselect works). Trigger: OnMouseOver, choose any sound file.
• Click Play and test that the sound plays when mouse touches the items
• While in Play mode, select "Window Panel" at Hierarchy. Set Alpha=0 in the UIPanel component. Everything disappears.
• Click the Game window and move the mouse at the position of the (now invisible) items. The sound still plays.

Note that if you change the alpha to 0 in the "Scroll View" object instead of "Window Panel" then the items don't play the sound anymore. They are correctly disabled due to alpha=0 in their parent panel, but not if the alpha=0 is inherited from an ancestor component.

[ivomarel]

I'm actually surprised that items would be disabled on alpha = 0, but I guess I'd solve your problem by adding a script that disables the panel after your alphatween.

[ArenMook]

Yup, this bug was reported along with a fix via email earlier. If I remember correctly, my suggested fix was to add

1. mMoved = true;

...to UIWidget.OnInit();

[Edy]

I'm actually surprised that items would be disabled on alpha = 0, but I guess I'd solve your problem by adding a script that disables the panel after your alphatween.

The ScrollView contents are actually disabled when you set the ScrollView Panel's alpha to 0. But not when the alpha=0 is inherited from an ancestor Panel or Widget.

Yup, this bug was reported along with a fix via email earlier. If I remember correctly, my suggested fix was to add

1. mMoved = true;

...to UIWidget.OnInit();

Tried, but the problem persists. I don't think this is related with that bug. Actually, when you set a ScrollView Panel's alpha to zero the contained elements are disabled. But if the alpha=0 state is inherited from an ancestor Panel or Widget, the ScrollView and its contents are invisible but the contained elements (colliders) remain active.

[ArenMook]

I will look into this when I return home tomorrow.