cef-bridge-data-exchange/CefBridgeDataExchange.Tests/Services/WindowControlService.cs

using System;
using System.Windows.Forms;

namespace CefBridgeDataExchange.Tests.Services
{
    internal class WindowControlService : IWindowControlService
    {
        private readonly Form _form;

        public WindowControlService(Form form)
        {
            _form = form;
        }

        WindowState IWindowControlService.GetWindowState()
        {
            return (WindowState)_form.WindowState;
        }

        void IWindowControlService.SetWindowState(WindowState windowState)
        {
            if (_form.InvokeRequired) _form.Invoke(new Action(() => _form.WindowState = (FormWindowState)windowState));
            else _form.WindowState = (FormWindowState)windowState;
        }

        void IWindowControlService.Close()
        {
            if (_form.InvokeRequired) _form.Invoke(new Action(() => _form.Close()));
            else _form.Close();
        }

        void IWindowControlService.DragMove()
        {
            if (_form.InvokeRequired)
            {
                _form.Invoke(new Action(() =>
                {
                    ReleaseCapture();
                    SendMessage(_form.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
                }));
            }
            else
            {
                ReleaseCapture();
                SendMessage(_form.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }

        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();
    }
}