Bug 22760 - ListView in AbsoluteLayout collapses to zero height and says that way even when content is added
Summary: ListView in AbsoluteLayout collapses to zero height and says that way even wh...
Status: RESOLVED ANSWERED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.2.2
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2014-09-08 17:13 UTC by Jakub Arnold
Modified: 2015-05-26 23:54 UTC (History)
5 users (show)

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

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Status:
RESOLVED ANSWERED

Description Jakub Arnold 2014-09-08 17:13:45 UTC
Steps to reproduce:

1. Create a page with an AbsoluteLayout
2. Add an empty ListView to the layout
3. Create an empty ObservableCollection and set that as a source to the ListView
4. Asynchronously load more data into the collection. **This must happen after the view is rendered, so adding a 1-2 second delay is a good way.**
5. The ListView stays collapsed at 0 height (invisible to the user) even after the data is loaded.

I'm not sure if this is a desired behavior, but it took me a little while to find what was causing this. Might be worth documenting that every view in an AbsoluteLayout must have its dimensions set explicitly.
Comment 1 Parmendra Kumar 2014-09-09 07:18:34 UTC
I have tried to reproduce this issue and unable to reproduce it. Could you Please provide us the sample project or environment info to reproduce this issue ?.

Screencast:http://screencast.com/t/pq2NpCNcQD6j

Environment Info:
=== Xamarin Studio ===

Version 5.3 (build 440)
Installation UUID: 1a096c6f-0678-402e-89b2-a2c10f7e80e4
Runtime:
	Mono 3.8.0 ((no/45d0ba1)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 308000009

=== Apple Developer Tools ===

Xcode 5.1 (5084)
Build 5B130a

=== Xamarin.Mac ===

Version: 1.10.0.10 (Business Edition)

=== Xamarin.Android ===

Version: 4.16.0 (Business Edition)
Android SDK: /Users/360_macmini/Desktop/android-sdk-macosx
	Supported Android versions:
		2.1    (API level 7)
		2.2    (API level 8)
		2.3    (API level 10)
		3.1    (API level 12)
		3.2    (API level 13)
		4.0    (API level 14)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
Java SDK: /usr
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

=== Xamarin.iOS ===

Version: 7.4.0.108 (Business Edition)
Hash: 77efa3f
Branch: 
Build date: 2014-08-26 07:59:55-0400

=== Build Information ===

Release ID: 503000440
Git revision: accb55419539e512cff857b14b80ec3107996511
Build date: 2014-09-01 08:53:05-04
Xamarin addins: 6dbac4b3a32df080bf98cde838ce89e573a92859

=== Operating System ===

Mac OS X 10.9.4
Darwin ShrutiMac.local 13.3.0 Darwin Kernel Version 13.3.0
    Tue Jun  3 21:27:35 PDT 2014
    root:xnu-2422.110.17~1/RELEASE_X86_64 x86_64
Comment 2 Jakub Arnold 2014-09-09 08:27:30 UTC
Here's a complete example that reproduces this https://gist.github.com/darthdeus/af0f11b0e5c306bfc134.

First comment out the "HeightRequest = 80" to see how it collapses to 0 height, then comment out the "await Task.Delay(2000)" to make the data loading synchronous and see how it doesn't collapse anymore.
Comment 3 Jakub Arnold 2014-09-09 08:37:31 UTC
Here's also a recording http://screencast.com/t/5FV41G98g
Comment 4 Parmendra Kumar 2014-09-10 07:06:09 UTC
I have checked this issue as per comment 2, And getting the same behavior but on Android when we comment out the the "HeightRequest = 80" to see it is not collapses to 0 height.

Screencast: http://screencast.com/t/WFK37nNoo
OutputLog: https://gist.github.com/anonymous/aabdc28bc69e6d052fd4

Environment: 
=== Xamarin Studio ===

Version 5.3 (build 441)
Installation UUID: 1a096c6f-0678-402e-89b2-a2c10f7e80e4
Runtime:
	Mono 3.8.0 ((no/45d0ba1)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 308000009

=== Apple Developer Tools ===

Xcode 5.1 (5084)
Build 5B130a

=== Xamarin.Mac ===

Version: 1.10.0.10 (Business Edition)

=== Xamarin.Android ===

Version: 4.16.0 (Business Edition)
Android SDK: /Users/360_macmini/Desktop/android-sdk-macosx
	Supported Android versions:
		2.1    (API level 7)
		2.2    (API level 8)
		2.3    (API level 10)
		3.1    (API level 12)
		3.2    (API level 13)
		4.0    (API level 14)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
Java SDK: /usr
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

=== Xamarin.iOS ===

Version: 7.4.0.108 (Business Edition)
Hash: 77efa3f
Branch: 
Build date: 2014-08-26 07:59:55-0400

=== Build Information ===

Release ID: 503000441
Git revision: befb6aa1176d37a5f678f4274f340a0159091b7a
Build date: 2014-09-08 17:57:02-04
Xamarin addins: 6dc7c388e31fdfc8014689839d37de0d4622435c

=== Operating System ===

Mac OS X 10.9.4
Darwin ShrutiMac.local 13.3.0 Darwin Kernel Version 13.3.0
    Tue Jun  3 21:27:35 PDT 2014
    root:xnu-2422.110.17~1/RELEASE_X86_64 x86_64
Comment 5 Jason Smith [MSFT] 2015-05-26 23:54:30 UTC
ListView does not trigger a resize automatically when content is added as these events are quite expensive. If your layout requires this, it is up to you to call ForceLayout on the parent. Doing this frequently will cause performance issues.

Alternatively don't set the RowHeight and the ListView will expand to the screen size.