// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
 
namespace System.Drawing.Design;
 
/// <summary>
///  Provides a font editor that is used to visually select and configure a Font object.
/// </summary>
[CLSCompliant(false)]
public class FontEditor : UITypeEditor
{
    private FontDialog? _fontDialog;
 
    public override object? EditValue(ITypeDescriptorContext? context, IServiceProvider provider, object? value)
    {
        // Even though we don't use the editor service this is historically what we did.
        if (!provider.TryGetService(out IWindowsFormsEditorService? _))
        {
            return value;
        }
 
        _fontDialog ??= new FontDialog
        {
            ShowApply = false,
            ShowColor = false,
            AllowVerticalFonts = false
        };
 
        if (value is Font fontValue)
        {
            _fontDialog.Font = fontValue;
        }
 
        HWND hwndFocus = PInvoke.GetFocus();
        try
        {
            if (_fontDialog.ShowDialog() == DialogResult.OK)
            {
                return _fontDialog.Font;
            }
        }
        finally
        {
            if (!hwndFocus.IsNull)
            {
                PInvoke.SetFocus(hwndFocus);
            }
        }
 
        return value;
    }
 
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext? context) => UITypeEditorEditStyle.Modal;
}