Bug 32698 - [Windows Phone] Unable to scroll if finger is placed in blank space
Summary: [Windows Phone] Unable to scroll if finger is placed in blank space
Status: RESOLVED ANSWERED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.5.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
: 35612 ()
Depends on:
Blocks:
 
Reported: 2015-08-03 01:04 UTC by Adam
Modified: 2016-01-13 04:01 UTC (History)
10 users (show)

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


Attachments
Repro project (109.98 KB, application/x-zip-compressed)
2015-09-03 19:37 UTC, Jimmy [MSFT]
Details


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Status:
RESOLVED ANSWERED

Description Adam 2015-08-03 01:04:35 UTC
If I have something similar to this in Windows Phone only

<ScrollView>

    <StackLayout Spacing="40">

      <Label BackgroundColor="Red" HeightRequest="100" />
      <Label BackgroundColor="Red" HeightRequest="100" />
      <Label BackgroundColor="Red" HeightRequest="100" />
      <Label BackgroundColor="Red" HeightRequest="100" />
      <Label BackgroundColor="Red" HeightRequest="100" />
      <Label BackgroundColor="Red" HeightRequest="100" /> 

    </StackLayout>

</ScrollView>

If you put your finger in the space between these labels and try to scroll it will not scroll. You have to actually place your finger on an element and then you can scroll.

This behavior is not present on iOS or Android.
Comment 1 Ram Chandra 2015-08-06 08:36:30 UTC
I have checked this issue and I am also getting the reported behavior. 

I have checked the same with android and iOS and observed that this issue is only exist for windows environment.

Screencast: http://www.screencast.com/t/i9beyBpKcE

Environment Info : 

Xamarin.Forms 1.5.0.6396-pre1

Microsoft Visual Studio Professional 2013
Version 12.0.30723.00 Update 3
Microsoft .NET Framework
Version 4.5.51641

Installed Version: Professional

LightSwitch for Visual Studio 2013   06177-004-0447006-02641
Microsoft LightSwitch for Visual Studio 2013

Team Explorer for Visual Studio 2013   06177-004-0447006-02641
Microsoft Team Explorer for Visual Studio 2013

Visual Basic 2013   06177-004-0447006-02641
Microsoft Visual Basic 2013

Visual C# 2013   06177-004-0447006-02641
Microsoft Visual C# 2013

Visual C++ 2013   06177-004-0447006-02641
Microsoft Visual C++ 2013

Visual F# 2013   06177-004-0447006-02641
Microsoft Visual F# 2013

Visual Studio 2013 Code Analysis Spell Checker   06177-004-0447006-02641
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker

Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.

The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

Windows Phone SDK 8.0 - ENU   06177-004-0447006-02641
Windows Phone SDK 8.0 - ENU

Application Insights Tools for Visual Studio Package   1.0
Application Insights Tools for Visual Studio

ASP.NET and Web Tools   12.3.50717.0
Microsoft Web Developer Tools contains the following components:
Support for creating and opening ASP.NET web projects
Browser Link: A communication channel between Visual Studio and browsers
Editor extensions for HTML, CSS, and JavaScript
Page Inspector: Inspection tool for ASP.NET web projects
Scaffolding: A framework for building and running code generators
Server Explorer extensions for Microsoft Azure Websites
Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure

ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563

ASP.NET Web Frameworks and Tools 2013   5.2.20703.0
For additional information, visit http://www.asp.net/

Common Azure Tools   1.2
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Microsoft Advertising SDK for Windows Phone   
Microsoft Advertising SDK for Windows Phone
Build 

Microsoft Azure Mobile Services Tools   1.2
Microsoft Azure Mobile Services Tools

Multilingual App Toolkit   3.1.1250.0
Multilingual App Toolkit helps you localize your Windows Store app by providing file management, pseudo and machine translation, translation editor, and build integration. http://go.microsoft.com/fwlink?linkid=245767

NuGet Package Manager   2.8.60318.734
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Office Developer Tools for Visual Studio 2013 ENU   12.0.30626
Microsoft Office Developer Tools for Visual Studio 2013 ENU

PowerShell Tools   1.2
Provides file classification services using PowerShell

PreEmptive Analytics Visualizer   1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.

SQL Server Data Tools   12.0.30919.1
Microsoft SQL Server Data Tools

Windows Phone 8.1 SDK Integration   1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.

Workflow Manager Tools 1.0   1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.

Xamarin   3.11.850.0 (5c48f6b)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android   5.1.5.3 (f98871a95a479f6d71b3067b7e5834d41fcb2118)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.Forms Intellisense   1.0
Provides intellisense for Xamarin.Forms in the XML editor.

Xamarin.iOS   8.10.4.0 (a888f9e906e136062b2de4a6b738787daae4e824)
Visual Studio extension to enable development for Xamarin.iOS.

Xamarin.iOS Unified Migration   1.0
Automated migration for Xamarin iOS Classic projects to Unified

Xamarin.TestCloud.Integration   1.0
Early preview of Xamarin Test Cloud integration
Comment 2 Jimmy [MSFT] 2015-09-03 19:37:31 UTC
Created attachment 12744 [details]
Repro project

Updated repro project to show issue is still present with Forms 1.5.0-pre3

I used previous versions of Xamarin to test if it ever worked as expected and it did in version 1.3.5. It seems to be broken in version 1.4 and above.
Comment 3 Adam 2015-09-04 01:45:55 UTC
Just thought I would add a workaround while this bug is being fixed.

If you set the background color in the ScrollView it works as expected.

<ScrollView BackgroundColor="Transparent">
Comment 4 Matthew Regul 2015-12-29 19:59:33 UTC
*** Bug 35612 has been marked as a duplicate of this bug. ***
Comment 5 Mihail 2016-01-04 10:09:41 UTC
I am also able to reproduce the bug.
Comment 6 Matthew Regul 2016-01-04 16:15:30 UTC
*As mentioned above by Adam*
Setting the background color of the ScrollView to transparent is indeed a workaround, nice find!

(In reply to Adam from comment #3)
> Just thought I would add a workaround while this bug is being fixed.
> 
> If you set the background color in the ScrollView it works as expected.
> 
> <ScrollView BackgroundColor="Transparent">
Comment 7 Paul DiPietro [MSFT] 2016-01-04 20:45:49 UTC
This is how WP works -- the view will only scroll if a visual element is being touched. Setting the background to "transparent" is effectively creating something visual which can respond to the touch action; it is otherwise effectively "dead space."
Comment 8 Adam 2016-01-13 04:01:44 UTC
Then to ensure things are kept common, should XF set the background to Transparent by default on Windows Phone? It creates an inconsistent environment if we have to workaround like this.

Are there any drawbacks for setting the Background to Transparent by default in a page initialization on Windows Phone?