PKHeX/PKHeX.WinForms/Controls/Slots/DragManager.cs

using System.Drawing;
using System.Windows.Forms;

namespace PKHeX.WinForms.Controls;

public sealed class DragManager
{
    public SlotChangeInfo<Cursor, PictureBox> Info { get; private set; } = new();
    public event DragEventHandler? RequestExternalDragDrop;
    public void RequestDD(object sender, DragEventArgs e) => RequestExternalDragDrop?.Invoke(sender, e);

    public void SetCursor(Form? f, Cursor? z)
    {
        if (f != null)
            f.Cursor = z;
        Info.Cursor = z;
    }

    public void ResetCursor(Form? sender)
    {
        SetCursor(sender, Cursors.Default);
    }

    public void Initialize()
    {
        Info = new SlotChangeInfo<Cursor, PictureBox>();
    }

    public void Reset() => Info.Reset();

    public Point MouseDownPosition { private get; set; }
    public bool CanStartDrag => Info.LeftMouseIsDown && !Cursor.Position.Equals(MouseDownPosition);
}