Bug 26428 - ScrollTo of ListView does not work in WindowsPhone normally
Summary: ScrollTo of ListView does not work in WindowsPhone normally
Status: RESOLVED FIXED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.3.2
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-01-26 15:23 UTC by sin
Modified: 2015-03-02 10:53 UTC (History)
5 users (show)

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


Attachments
As for iOS, a problem is not (114.44 KB, image/png)
2015-01-26 15:24 UTC, sin
Details
As for Android, a problem is not (64.16 KB, image/png)
2015-01-26 15:25 UTC, sin
Details
WindowsPhone is movement defectiveness (86.77 KB, image/png)
2015-01-26 15:27 UTC, sin
Details
Sample App (6.47 MB, application/octet-stream)
2015-01-29 11:34 UTC, Udham Singh
Details


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Related Links:
Status:
RESOLVED FIXED

Description sin 2015-01-26 15:23:47 UTC
I use 1.3.2.6299-pre1
---------------------------------------------------------------------------
PM> get-package

Id                             Version              Description/Release Notes                                                                                                                 
--                             -------              -------------------------                                                                                                                 
WPtoolkit                      4.2013.08.16         Windows Phone toolkit provides a collection of controls, extension methods 
Xamarin.Android.Support.v4     19.1.0               C# bindings for android support library v4.                                                                                               
Xamarin.Forms                  1.3.1.6296           Build native UIs for iOS, Android, and Windows Phone from a single, shared Xamarin.Forms                  1.3.2.6299-pre1      Build native UIs for iOS, Android, and Windows Phone from a single, shared 
---------------------------------------------------------------------------

The following cord does not work normally.
A scroll position is strange.
---------------------------------------------------------------------------
public class App : Application{
    public App() {
        MainPage = new MyPage();
    }
}
class MyPage : ContentPage{
     public MyPage() {

        //100 list making (item-0~item-99)
        var ar = Enumerable.Range(0, 100).Select(n => string.Format("item-{0}", n)).ToList();
        var listView = new ListView() {
            ItemsSource = ar
        };


        //turn the 20th into a target (item-20)
        const int index = 20;
        ar[index] = ar[index] + " (Target)";

        //generate a command button
        var buttonStart = new Button { Text = "Start" };
        buttonStart.Clicked += (sender, args) => {
            //scroll it so that a target becomes the top
            listView.ScrollTo(ar[index], ScrollToPosition.Start, true);
        };
        var buttonCenter = new Button { Text = "Center" };
        buttonCenter.Clicked += (sender, args) => {
            //scroll it so that a target grows centrally
            listView.ScrollTo(ar[index], ScrollToPosition.Center, true);
        };
        var buttonEnd = new Button { Text = "End" };
        buttonEnd.Clicked += (sender, args) => {
            //scroll it so that a target grows last
            listView.ScrollTo(ar[index], ScrollToPosition.End, true);
        };

        var buttonMakeVisible = new Button { Text = "MakeVisible" };
        buttonMakeVisible.Clicked += (sender, args) => {
            //scroll a target to a position to look
            listView.ScrollTo(ar[index], ScrollToPosition.MakeVisible, true);
        };

        Content = new StackLayout {
            Padding = new Thickness(0, Device.OnPlatform(20, 0, 0), 0, 0),
            Children = {
                new StackLayout {//Four arrange a command button sideways
                    Padding = new Thickness(10),
                    Orientation = StackOrientation.Horizontal,
                    Children = { buttonStart,buttonCenter,buttonEnd,buttonMakeVisible}
                },listView
            }
        };
    }
}
---------------------------------------------------------------------------
Comment 1 sin 2015-01-26 15:24:46 UTC
Created attachment 9503 [details]
As for iOS, a problem is not
Comment 2 sin 2015-01-26 15:25:23 UTC
Created attachment 9504 [details]
As for Android, a problem is not
Comment 3 sin 2015-01-26 15:27:06 UTC
Created attachment 9505 [details]
WindowsPhone is movement defectiveness
Comment 4 Udham Singh 2015-01-29 11:34:33 UTC
Created attachment 9551 [details]
Sample App

I have checked this issue with the help of code given in bug and able to reproduce the reported behavior. I am attaching a sample app which I have created to reproduce this issue.

Screencast : http://www.screencast.com/t/pW0TyFlW

Environment Info : 

Xamarin.Forms.1.3.2.6309-pre2

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

NuGet Package Manager   2.8.50926.663
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   3.9.291.0 (9f3e552)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android   4.20.0.34 (49a04b966feb40dfdba49d57ba16249b66d606a6)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS   8.6.1.0 (3b3ef438017c7ecf486defa9e01567a5f2b3cb2a)
Visual Studio extension to enable development for Xamarin.iOS.

Xamarin.iOS Unified Migration   1.0
Automated migration for Xamarin iOS Classic projects to Unified
Comment 5 Rui Marinho 2015-03-02 10:53:22 UTC
This should be fixed in 1.3.5-pre1