3rdpartylibs/fastreports.wpf/FastReport.Forms.WPF/Misc/SystemWindow.cs

namespace System.Windows.Forms
{
    public class SystemWindow : Window, IForm
    {
        public System.Windows.Controls.ContentControl ContentControl => this;

        public bool ExtendedAppArea { get; set; } // not supported

        public double ExtendedAppAreaSize { get; set; } // not supported

        public System.Drawing.Size ClientSizeDelta => NativeMethods.GetClientSizeDelta(this);

        private FormBorderStyle formBorderStyle;
        public FormBorderStyle FormBorderStyle
        {
            get => formBorderStyle;
            set
            {
                formBorderStyle = value;

                ResizeMode = value == FormBorderStyle.FixedDialog || value == FormBorderStyle.FixedToolWindow ? ResizeMode.NoResize : ResizeMode.CanResize;
                WindowStyle = value switch
                {
                    FormBorderStyle.None => WindowStyle.None,
                    FormBorderStyle.FixedToolWindow => WindowStyle.ToolWindow,
                    FormBorderStyle.SizableToolWindow => WindowStyle.ToolWindow,
                    _ => WindowStyle.SingleBorderWindow
                };
                
                if (value == FormBorderStyle.FixedDialog)
                {
                    MinimizeBox = MaximizeBox = ShowIcon = false;
                }
                else if (value == FormBorderStyle.None)
                    ResizeMode = ResizeMode.NoResize;
            }
        }

        public bool MaximizeBox { get; set; }

        public bool MinimizeBox { get; set; }

        public bool ShowIcon { get; set; }

        public SystemWindow()
        {
            Loaded += (s, e) => NativeMethods.RemoveWindowItems(this, ShowIcon, MinimizeBox, MaximizeBox);
        }
    }
}