Bug 29875 - IsEnabled does not work for Views derived from ViewElementRenderer<T>
Summary: IsEnabled does not work for Views derived from ViewElementRenderer<T>
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.4.2
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-05-08 08:58 UTC by John Miller [MSFT]
Modified: 2015-05-22 16:08 UTC (History)
6 users (show)

Tags: AC
Is this bug a regression?: ---
Last known good build:

Test Case (179.80 KB, application/zip)
2015-05-08 08:58 UTC, John Miller [MSFT]

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Description John Miller [MSFT] 2015-05-08 08:58:59 UTC
Created attachment 11128 [details]
Test Case


   Any control which has a renderer derived from ViewElementRenderer<T> like Page, BoxView, Carousel, FrameView, TabbedView can't be disabled.
   The issue is that IsEnabled change is not handled and native view is not updated.

**Steps to Reproduce:**

   1. Run the attached sample on iOS or Android
   2. Touch the Red part of the screen, a tapped message is logged to the console
   3. After 3 seconds, the IsEnabled property is toggled to False
   4. Repeat steps #2, the tapped message is logged again.

**Actual Results:**

   Setting IsEnabled to false still registers touch events. 

**Expected Results:**

   Setting IsEnabled to false should disabled the view from registering touch events.

**Build Date & Platform:**

   Android and iOS
   XF 1.4.2
Comment 1 Jason Smith [MSFT] 2015-05-21 05:44:33 UTC
What does that even do? Great your Box isn't enabled, its now as inert as it previous was?
Comment 2 John Miller [MSFT] 2015-05-21 09:08:53 UTC

These controls can receive a TapGestureRecognizer. The Enabled property was thought to disable touch when there might be a GestureRecognizer on it. Similar to UserInteractionEnabled on iOS, and whatever is similar on Android. UIView does not inertly receive touch events, but if you add a gesture to it, UserInteractionEnabled controls if that gesture receives touch events or not. 

The Actual/Expected Results area explain what was expected.
Comment 3 John Miller [MSFT] 2015-05-22 16:08:12 UTC
It is suggested as a workaround to instead remove the gesture recognizer when the view should not be touchable.