TweetDuck/Data/WindowState.cs

using System.Drawing;
using System.Windows.Forms;
using TweetDuck.Core.Controls;
using TweetLib.Core.Serialization.Converters;
using TweetLib.Core.Utils;

namespace TweetDuck.Data{
    sealed class WindowState{
        private Rectangle rect;
        private bool isMaximized;

        public void Save(Form form){
            rect = form.WindowState == FormWindowState.Normal ? form.DesktopBounds : form.RestoreBounds;
            isMaximized = form.WindowState == FormWindowState.Maximized;
        }

        public void Restore(Form form, bool firstTimeFullscreen){
            if (rect != Rectangle.Empty){
                form.DesktopBounds = rect;
                form.WindowState = isMaximized ? FormWindowState.Maximized : FormWindowState.Normal;
            }

            if ((rect == Rectangle.Empty && firstTimeFullscreen) || form.IsFullyOutsideView()){
                form.DesktopBounds = Screen.PrimaryScreen.WorkingArea;
                form.WindowState = FormWindowState.Maximized;
                Save(form);
            }
        }

        public static readonly SingleTypeConverter<WindowState> Converter = new SingleTypeConverter<WindowState>{
            ConvertToString = value => $"{(value.isMaximized ? 'M' : '_')}{value.rect.X} {value.rect.Y} {value.rect.Width} {value.rect.Height}",
            ConvertToObject = value => {
                int[] elements = StringUtils.ParseInts(value.Substring(1), ' ');
                
                return new WindowState{
                    rect = new Rectangle(elements[0], elements[1], elements[2], elements[3]),
                    isMaximized = value[0] == 'M'
                };
            }
        };
    }
}