Positioning items on X and Y within an ItemsControl

Using a transform to position items in an ItemsControl

If you need to overlay points of interest on a map or distribute usercontrols on a game board, you can foreach over the items and add them to a placeholder. But all this can be accomplished much easier with an ItemsControl that has a Grid or Canvas as its ItemsPanelTemplate. First let me show you what this demo project does:


Steps to create this

public class Location {
    public string Name { get; set; }
    public double X { get; set; }
    public double Y { get; set; }
<ItemsControl ItemsSource="{Binding Locations}">
            <Grid HorizontalAlignment="Left" Background="#FFFF0069" RenderTransformOrigin="0.5,0.5" Height="30">
                    <CompositeTransform Rotation="-45" TranslateX="{Binding X}" TranslateY="{Binding Y}"/>
                <Rectangle Fill="#FFFF0069" RenderTransformOrigin="0.5,0.5" Width="15" Height="15" HorizontalAlignment="Right" Margin="0,0,-3,0">
                        <CompositeTransform Rotation="45"/>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding Name}" d:LayoutOverrides="Height" FontFamily="Arial Black" FontSize="16" Margin="2"/>
            <Grid/> // this is a StackPanel by default

The trick here is to use a Grid in the ItemsPanelTemplate and bind the TranslateX and TranslateY to the X and Y of the model.

public ObservableCollection<Location>  Locations { get; set; }
public MainViewModel() {
    Locations = new ObservableCollection<Location>();
    Locations.Add(new Location { Name = "London", X = 175, Y = 35 });
    Locations.Add(new Location { Name = "Eindhoven", X = 240, Y = 40 });
    Locations.Add(new Location { Name = "M√ľnchen", X = 330, Y = 100 });
<ItemsControl ItemsSource="{Binding Locations}">
Written by Loek van den Ouweland on June 03, 2011. Questions regarding this artice? You can send them to the address below.
By using this site, you acknowledge that you have read and understand our Cookie and Privacy Policy.