Gridview ScrollViewer Issue

Question

Hi,
So I have a gridview with some rectangles in it and I would like to manually scroll the gridview using the ScrollViewer.ChangeView method. So I trap on the right arrow key and then invoke the ChangeView method to scroll the gridview to a different
location. I notice if I slowly hit the key repeatedly then the horizontal offset is what I expect it to be based on the offset parameter I passed to the ChangeView method. However, if I hit the right arrow key quickly then the horizontal offsets are not what
they should be based on the parameter I passed. Is there any way I can fix this so that no matter how quickly I hit the key (or even if I hold it down) the horizontal offset of the ScrollViewer will consistently increase by the offset I
pass to ChangeView?
Thanks :-)
Here is my example ...
<Page
x:Class="ReorderTest.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:ReorderTest"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Canvas x:Name="canvas" Width="1920" Height="1080">
<GridView x:Name="gridView1" Width="1920" Height="1080" CanReorderItems="True" SelectionMode="Single" ScrollViewer.HorizontalScrollMode="Enabled" CanDragItems="True" AllowDrop="True">
<GridView.ItemContainerTransitions>
<TransitionCollection>
<RepositionThemeTransition/>
</TransitionCollection>
</GridView.ItemContainerTransitions>
</GridView>
</Canvas>
</Page>
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Diagnostics;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.UI.Xaml.Media.Imaging;
using Windows.UI.Xaml.Media.Animation;
using Windows.UI.Xaml.Shapes;
using Windows.System;
using Windows.UI.Core;
using WinRTXamlToolkit.Controls.Extensions;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace ReorderTest
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
private ScrollViewer scrollViewer;
public MainPage()
this.InitializeComponent();
Window.Current.CoreWindow.KeyDown += CoreWindow_KeyDown;
SolidColorBrush greenBrush = new SolidColorBrush(Windows.UI.Colors.Green);
for (int i = 0; i < 60; i++)
Rectangle temp = new Rectangle();
temp.Height = 250;
temp.Width = 400;
temp.Fill = greenBrush;
gridView1.Items.Add(temp);
this.Loaded += MainPage_Loaded;
private void MainPage_Loaded(object sender, RoutedEventArgs e)
scrollViewer = gridView1.GetFirstDescendantOfType<ScrollViewer>(); // using WinRTXamlToolkit.Controls.Extensions;
private void CoreWindow_KeyDown(CoreWindow sender, KeyEventArgs args)
//Rects[1].Opacity = 0;
if (args.VirtualKey == VirtualKey.Right)
scrollViewer.ChangeView(scrollViewer.HorizontalOffset + 300, null, null);
Debug.WriteLine(scrollViewer.HorizontalOffset);

Answer 1

Hi duffybr,
Try something like I suggested you in the previous thread:https://social.msdn.microsoft.com/Forums/en-US/8e81da67-949a-4206-855e-1dad60299841/scrollviewerchangeview-not-working-on-my-vertically-scrolling-gridview?forum=winappswithcsharp
Does it not working?
--James
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