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Question by Rs · Nov 25, 2014 at 12:03 AM · inputtoggle4.6scroll

4.6 Scroll Rect not working with Event Triggers?

Hi all, I've setup a Scroll Rect to scroll a Toggle Group with a bunch of Toggles. If I use the OnValueChange event in the Toggle component the scrolling works perfectly. Instead, if I want come more complex logics and I use an Event Trigger component (to get Select, Deselect and other events) these seem to absorb the touch event breaking the scrolling functionality.

Is someone else having this issue? Do you know what may cause it and a workaround?

Thank you all.

How to reproduce the problem step by step

  1. Create a new scene

  2. Create a UI Canvas

  3. Create a UI Panel, call it "Scroller" and make it child of your canvas

  4. Create another UI Panel, bigger than the previous one, and make it child of the previous panel, call it "Content" and make sure it is assigned an image.

  5. Create a new game object and add a Toggle Group component to it. Call it toggle group and make it child of you "Content" panel.

  6. Create one or two Toggles, add some graphics to them (image or text) and make them children of "Content"

  7. Test the scrolling. It should work even when you start dragging from one of the toggles.

  8. Now add an Event Trigger component to your triggers, add a couple of event types (Select and Deselect will do).

  9. Test again. Now it shouldn't work when starting to drag from any toggles.

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avatar image Kiwasi · Nov 25, 2014 at 12:04 AM 0
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I may have encountered a similar problem in one of my tutorials. I'll have a play and see what I can come up with.

avatar image Rs · Nov 25, 2014 at 12:53 PM 0
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Sweet! Good to know I'm not alone. :) Let me know.

avatar image hadesfury · Dec 04, 2014 at 11:13 AM 0
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It's happening in release 4.6.0

avatar image gslance · Feb 18, 2015 at 11:50 AM 0
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Was there ever a fix for this?

avatar image BlackPhi · Mar 14, 2015 at 01:39 AM 0
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I hit this problem too, so I had a little play.

  1. If I put the scrollable panel inside another parent panel and attach an event trigger to that parent then scrolling is fine.

  2. If I put a (smaller) button inside the scrollable area and attach an event trigger to the button then I can scroll from anywhere in the scrollable area except for the button.

It looks as though mouse/touch events are being passed from front to back of the UI under normal circumstances, but the event trigger script is consuming all of them, rather than passing them on, not just the ones specified in the trigger.

The obvious solution would be to code our own event scripts, ignoring the supplied event trigger one. Either that or find some way of coding a pass-through in the functions called by the trigger.

Any thoughts?

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Answer by Railon23 · Apr 20, 2015 at 03:12 AM

Had the same issue right now. Found this solution and it works perfectly for me: http://answers.unity3d.com/questions/852385/onpointerclick-function-not-triggering.html

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Answer by Chris9 · Feb 24, 2015 at 08:55 AM

Hello,

Check these interfaces : http://docs.unity3d.com/460/Documentation/Manual/SupportedEvents.html

You can achieve this by adding to your GameObjects a Monobehaviour which implements every one of those.

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Answer by MFen · Mar 03, 2016 at 02:20 PM

Fairly old question but ran into somewhat same situation with Unity 5.3.3. Easy way to fix is put your eventtrigger on the scroll rect instead of the object you want to cause the trigger, the scroll rect triggered it for me.

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Answer by mk26 · Sep 04, 2015 at 10:21 AM

Can be fixed using this OnDeselect

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Answer by $$anonymous$$ · Nov 24, 2016 at 04:15 PM

a work around would be to use a button component and then add the triggers to that button using the already supplied "On ClicK" trigger of the button itself rather than using standalone event trigger components. it is strange but it works

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