WCS/Cowain.Base/Helpers/GridPositionAnimator.cs

using Avalonia.Animation;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Styling;
using Avalonia.Xaml.Interactivity;
using Avalonia.Threading;


namespace Cowain.Base.Helpers;

public class GridPositionAnimator : Behavior<Control>
{

    public static readonly StyledProperty<int> RowProperty =
       AvaloniaProperty.Register<GridPositionAnimator, int>("Row");

    public static readonly StyledProperty<int> ColumnProperty =
        AvaloniaProperty.Register<GridPositionAnimator, int>("Column");

    public int Row
    {
        get => GetValue(RowProperty);
        set => SetValue(RowProperty, value);
    }

    public int Column
    {
        get => GetValue(ColumnProperty);
        set => SetValue(ColumnProperty, value);
    }

    protected override void OnAttached()
    {
        base.OnAttached();
        if (AssociatedObject != null)
        {
            Dispatcher.UIThread.Post(() =>
            {
                // 初始设置位置
                Grid.SetRow(AssociatedObject, Row);
                Grid.SetColumn(AssociatedObject, Column);

                // 新的事件订阅方式
                RowProperty.Changed.AddClassHandler<GridPositionAnimator>((b, e) => b.OnRowChanged(e));
                ColumnProperty.Changed.AddClassHandler<GridPositionAnimator>((b, e) => b.OnColumnChanged(e));
            });
        }
    }

    private void OnRowChanged(AvaloniaPropertyChangedEventArgs e)
    {
        if (AssociatedObject != null && e.NewValue is int newRow)
        {
            // 创建行变化动画
            var animation = new Animation
            {
                Duration = TimeSpan.FromSeconds(1),
                FillMode = FillMode.Both,
                Children =
                {
                    new KeyFrame
                    {
                        Cue = new Cue(0d),
                        Setters = { new Setter { Property = Grid.RowProperty, Value = e.OldValue } }
                    },
                    new KeyFrame
                    {
                        Cue = new Cue(1d),
                        Setters = { new Setter { Property = Grid.RowProperty, Value = newRow } }
                    }
                }
            };

            animation.RunAsync(AssociatedObject);
        }
    }

    private void OnColumnChanged(AvaloniaPropertyChangedEventArgs e)
    {
        if (AssociatedObject != null && e.NewValue is int newColumn)
        {
            // 创建列变化动画
            var animation = new Animation
            {
                Duration = TimeSpan.FromSeconds(1),
                FillMode = FillMode.Both,
                Children =
                {
                    new KeyFrame
                    {
                        Cue = new Cue(0d),
                        Setters = { new Setter { Property = Grid.ColumnProperty, Value = e.OldValue } }
                    },
                    new KeyFrame
                    {
                        Cue = new Cue(1d),
                        Setters = { new Setter { Property = Grid.ColumnProperty, Value = newColumn } }
                    }
                }
            };

            animation.RunAsync(AssociatedObject);
        }
    }
}