Radial Layout

Radial Layout shows how to create a Radial Panel using 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 RadialPanel.cs and then Click on Add.

Step 4

Step 5

You will now be in the View for the Code of RadialPanel.cs, within this type the following Code:

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Media;
using System;
using Windows.Foundation;

namespace RadialLayout;

public class RadialPanel : Panel
{
    // Dependency Properties & Properties

    // Measure Override Method

    // Arrange Override Method

}
                                    

There are using statements for the User Control, a namespace for RadialLayout along with a class of RadialPanel that will represent the User Control and Inherits the class of Panel.

Step 6

Then in the namespace of RadialLayout in the class of RadialPanel after the Comment of // Dependency Properties & Properties type the following Dependency Properties and Properties

public static readonly DependencyProperty ItemHeightProperty =
DependencyProperty.Register(nameof(ItemHeight), 
typeof(double), typeof(RadialPanel),
new PropertyMetadata(double.NaN));

public static readonly DependencyProperty ItemWidthProperty =
DependencyProperty.Register(nameof(ItemWidth), 
typeof(double), typeof(RadialPanel),
new PropertyMetadata(double.NaN));

public static readonly DependencyProperty IsOrientedProperty =
DependencyProperty.Register(nameof(IsOriented), 
typeof(bool), typeof(RadialPanel),
new PropertyMetadata(false));

public double ItemHeight
{
    get { return (double)GetValue(ItemHeightProperty); }
    set { SetValue(ItemHeightProperty, value); }
}

public double ItemWidth
{
    get { return (double)GetValue(ItemWidthProperty); }
    set { SetValue(ItemWidthProperty, value); }
}

public bool IsOriented
{
    get { return (bool)GetValue(IsOrientedProperty); }
    set { SetValue(IsOrientedProperty, value); }
}
                                    

The Dependency Properties or Properties for the User Control can be customised for the Radial Panel.

Step 7

While still in the namespace of RadialLayout in the class of RadialPanel after the Comment of // Measure Override Method type the following Method:

protected override Size MeasureOverride(Size availableSize)
{
    double itemWidth = ItemWidth;
    double itemHeight = ItemHeight;
    bool hasFixedWidth = !double.IsNaN(itemWidth);
    bool hasFixedHeight = !double.IsNaN(itemHeight);
    var itemSize = new Size(
        hasFixedWidth ? itemWidth : availableSize.Width,
        hasFixedHeight ? itemHeight : availableSize.Height);
    foreach (var element in Children)
    {
        element.Measure(itemSize);
    }
    return itemSize;
}
                                    

The Method of MeasureOverride will Measure the Size required to layout the Children of the Panel.

Step 8

While still in the namespace of RadialLayout in the class of RadialPanel after the Comment of // Arrange Override Method type the following Method:

protected override Size ArrangeOverride(Size finalSize)
{
    double itemWidth = ItemWidth;
    double itemHeight = ItemHeight;
    bool hasFixedWidth = !double.IsNaN(itemWidth);
    bool hasFixedHeight = !double.IsNaN(itemHeight);
    double radiusX = finalSize.Width * 0.5;
    double radiusY = finalSize.Height * 0.5;
    int count = Children.Count;
    double deltaAngle = 2 * Math.PI / count;
    var centre = new Point(finalSize.Width / 2,
        finalSize.Height / 2);
    for (int i = 0; i < count; i++)
    {
        var element = Children[i];
        var elementSize = new Size(
        hasFixedWidth ? itemWidth : element.DesiredSize.Width,
        hasFixedHeight ? itemHeight : element.DesiredSize.Height);
        double angle = i * deltaAngle;
        double x = centre.X + radiusX * Math.Cos(angle)
            - elementSize.Width / 2;
        double y = centre.Y + radiusY * Math.Sin(angle)
            - elementSize.Height / 2;
        if (IsOriented)
            element.RenderTransform = null;
        else
        {
            element.RenderTransformOrigin = new Point(0.5, 0.5);
            element.RenderTransform = new RotateTransform()
            {
                Angle = angle * 180 / Math.PI
            };
        }
        element.Arrange(new Rect(x, y,
            elementSize.Width, elementSize.Height));
    }
    return finalSize;
}
                                    

The Method of ArrangeOverride will position the Children of the Panel and position them at different degrees of rotation around the centre of the User Control and IsOriented will either rotate them to face downwards or towards the centre of the User Control.

Step 9

Step 10

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 11

While still in the XAML for MainWindow.xaml above </Window>, type in the following XAML:

                            
<local:RadialPanel Height="500" Width="500" IsOriented="True">
    <Rectangle Width="100" Height="100" Fill="Red"/>
    <Rectangle Width="100" Height="100" Fill="Orange"/>
    <Rectangle Width="100" Height="100" Fill="Yellow"/>
    <Rectangle Width="100" Height="100" Fill="Green"/>
    <Rectangle Width="100" Height="100" Fill="Cyan"/>
    <Rectangle Width="100" Height="100" Fill="Blue"/>
    <Rectangle Width="100" Height="100" Fill="Magenta"/>
    <Rectangle Width="100" Height="100" Fill="Purple"/>
</local:RadialPanel>
                                    

This XAML contains the User Control of RadialPanel with IsOriented set to True with the Children containing Controls for a Rectangle in various colours.

Step 12

Step 13

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 14

Step 15

Once running you will see the Radial Panel displayed.

Step 16