Parallax View
Learn to use the Parallax View in Windows App SDK with this Tutorial
Parallax View shows how you can use ParallaxView which allows you to combine the scroll of a list
to a background element so as the list scrolls it animates the background element with Parallax in an
application using the Windows App SDK.
Step 1
Follow Setup and Start on how to get Setup and Install what you need for Visual Studio 2022 and Windows App SDK.
Step 2
Then in Visual Studio within Solution Explorer for the Solution, right click on the Project shown below the Solution and then select Add then New Item…
Step 3
Then in Add New Item from the C# Items list, select Code and then select Code File from the list next to this, then type in the name of Library.cs and then Click on Add.
Step 4
You will now be in the View for the Code of Library.cs, within this type the following Code:
using Microsoft.UI.Xaml.Controls;
using System;
internal class Library
{
private class Item
{
public Guid Id { get; set; } = Guid.NewGuid();
public string Text { get; set; } = string.Empty;
}
public static void Add(ListView listView, string value)
{
listView.Items.Add(new Item
{
Text = value
});
}
public static void Remove(ListView listView, object sender)
{
Item item = (sender as AppBarButton).Tag as Item;
listView.Items.Remove(item);
}
}
The Class that has been defined in Library.cs has a Class within it of Item which is marked private, this is just for use with
Library.cs which will represent what will be added or removed from the ListView which is performed in the Methods of Add and
Remove which are declared as static so an Instance of the Class is not needed.
Step 5
Step 6
In the XAML for MainWindow.xaml there will be some XAML for a StackPanel, this should be Removed:
<StackPanel Orientation="Horizontal"
HorizontalAlignment="Center" VerticalAlignment="Center">
<Button x:Name="myButton" Click="myButton_Click">Click Me</Button>
</StackPanel>
Step 7
While still in the XAML for MainWindow.xaml above </Window>, type in the following XAML:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<AutoSuggestBox Grid.Row="0" Margin="25" Name="Value" QueryIcon="Add"
QuerySubmitted="Value_QuerySubmitted"/>
<Grid Grid.Row="1">
<ParallaxView Source="{x:Bind Display}" VerticalShift="100">
<StackPanel Spacing="5" Orientation="Vertical"
HorizontalAlignment="Center">
<Rectangle Margin="10" Width="75" Height="75" Fill="Black"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Gray"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Red"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Orange"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Yellow"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Green"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Cyan"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Blue"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Magenta"/>
<Rectangle Margin="10" Width="75" Height="75" Fill="Purple"/>
</StackPanel>
</ParallaxView>
<ListView x:Name="Display">
<ListView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Text}"
VerticalAlignment="Center"/>
<AppBarButton Grid.Column="1" Icon="Remove" Label="Remove"
Tag="{Binding}" Click="Remove_Click"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
</ListView>
</Grid>
</Grid>
This XAML features a Grid with two Rows, the first Row is for a AutoSuggestBox to add an Item, then the second Row is the ParallaxView containing
Rectangle elements which has the Source set to the ListView which uses a DataTemplate which controls how each Item in the ListView will look like
and contains the AppBarButton which will be used to remove an Item.
Step 8
Step 9
In the Code for MainWindow.xaml.cs there be a Method of myButton_Click(...) this should be Removed by removing the following:
private void myButton_Click(object sender, RoutedEventArgs e)
{
myButton.Content = "Clicked";
}
Step 10
Once myButton_Click(...) has been removed, type the following Code below the end of the Constructor of public MainWindow() { ... }:
private void Value_QuerySubmitted(AutoSuggestBox sender,
AutoSuggestBoxQuerySubmittedEventArgs args)
{
Library.Add(Display, Value.Text);
}
private void Remove_Click(object sender, RoutedEventArgs e)
{
Library.Remove(Display, sender);
}
The Method of Value_QuerySubmitted will call the Method within Library.cs of Add from Library passing in the ListView and also
passes in the Property for Text. The Method of Remove_Click will call the Method for Remove with the ListView and the object for sender.
Step 11
Step 12
Once running you should see a AutoSuggestBox and some Rectangle elements.
Step 13
You can type into the AutoSuggestBox any values and then press Enter or Click on the + option to add them, then when you add a few, you can try scrolling the ListView and you should see the Parallax View in action.
Step 14
