Wino-Mail/Wino.Core.UWP/Controls/WinoNavigationViewItem.cs

using System.Numerics;
using Microsoft.UI.Xaml.Controls;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Hosting;

namespace Wino.Core.UWP.Controls;

public partial class WinoNavigationViewItem : NavigationViewItem
{
    public bool IsDraggingItemOver
    {
        get { return (bool)GetValue(IsDraggingItemOverProperty); }
        set { SetValue(IsDraggingItemOverProperty, value); }
    }

    public static readonly DependencyProperty IsDraggingItemOverProperty = DependencyProperty.Register(nameof(IsDraggingItemOver), typeof(bool), typeof(WinoNavigationViewItem), new PropertyMetadata(false, OnIsDraggingItemOverChanged));

    private static void OnIsDraggingItemOverChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
        if (obj is WinoNavigationViewItem control)
            control.UpdateDragEnterState();
    }

    private void UpdateDragEnterState()
    {
        // TODO: Add animation. Maybe after overriding DragUI in shell?

        //if (IsDraggingItemOver)
        //{
        //    ScaleAnimation(new System.Numerics.Vector3(1.2f, 1.2f, 1.2f));
        //}
        //else
        //{
        //    ScaleAnimation(new System.Numerics.Vector3(1f, 1f, 1f));
        //}
    }

    private void ScaleAnimation(Vector3 vector)
    {
        if (Content is UIElement content)
        {
            var visual = ElementCompositionPreview.GetElementVisual(content);
            visual.Scale = vector;
        }
    }
}