using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Exferia_Actualizacion_BD._3_Vistas
{
    public partial class P_Personalizada : Form
    {
        #region Librerias Externas
        [DllImport("dwmapi.dll")]
        public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);

        [DllImport("dwmapi.dll")]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);

        [DllImport("dwmapi.dll")]
        public static extern int DwmIsCompositionEnabled(ref int pfEnabled);

        #endregion


        private bool g_bol_Seleccionada;
        private int g_int_X, g_int_Y;

        public P_Personalizada()
        {
            InitializeComponent();
        }

        private void P_Personalizada_MouseDown(object sender, MouseEventArgs e)
        {
            g_bol_Seleccionada = true;
            g_int_X = e.X;
            g_int_Y = e.Y;
        }

        private void P_Personalizada_MouseMove(object sender, MouseEventArgs e)
        {
            if (g_bol_Seleccionada)
            {
                SetDesktopLocation(Cursor.Position.X - g_int_X, Cursor.Position.Y - g_int_Y);
            }
        }

        private void P_Personalizada_Resize(object sender, EventArgs e)
        {
            pnl_BordeIzquierdo.Size = new Size(2, Height - 3);

            pnl_BordeDerecho.Location = new Point(Width - 3, pnl_BordeDerecho.Location.Y);
            pnl_BordeDerecho.Size = new Size(2, Height - 3);

            pnl_BordeInferior.Location = new Point(pnl_BordeInferior.Location.X, Height - 3);
            pnl_BordeInferior.Size = new Size(Width - 4, 2);

        }

        private void P_Personalizada_MouseUp(object sender, MouseEventArgs e)
        {
            g_bol_Seleccionada = false;
        }

        #region Crear Sombra de la pantalla
        protected override void WndProc(ref Message m)
        {
            //Sombra de la pantalla ..................................................
            if (m.Msg == WM_NCPAINT)// box shadow
            {
                if (g_bol_HabilitarSombra)
                {
                    var v = 2;
                    DwmSetWindowAttribute(Handle, 2, ref v, 4);
                    MARGINS margins = new MARGINS()
                    {
                        bottomHeight = 1,
                        leftWidth = 1,
                        rightWidth = 1,
                        topHeight = 1
                    };
                    DwmExtendFrameIntoClientArea(Handle, ref margins);
                }
            }

            base.WndProc(ref m);
        }

        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
        (
            int nLeftRect, // x-coordinate of upper-left corner
            int nTopRect, // y-coordinate of upper-left corner
            int nRightRect, // x-coordinate of lower-right corner
            int nBottomRect, // y-coordinate of lower-right corner
            int nWidthEllipse, // height of ellipse
            int nHeightEllipse // width of ellipse
         );

        private bool g_bol_HabilitarSombra;                     // variables for box shadow
        private const int CS_DROPSHADOW = 0x00020000;
        private const int WM_NCPAINT = 0x0085;
        private const int WM_ACTIVATEAPP = 0x001C;

        public struct MARGINS                           // struct for box shadow
        {
            public int leftWidth;
            public int rightWidth;
            public int topHeight;
            public int bottomHeight;
        }

        private const int WM_NCHITTEST = 0x84;          // variables for dragging the form
        private const int HTCLIENT = 0x1;
        private const int HTCAPTION = 0x2;

        protected override CreateParams CreateParams
        {
            get
            {
                g_bol_HabilitarSombra = CheckAeroEnabled();

                CreateParams cp = base.CreateParams;
                if (!g_bol_HabilitarSombra)
                    cp.ClassStyle |= CS_DROPSHADOW;

                return cp;
            }
        }

        private bool CheckAeroEnabled()
        {
            if (Environment.OSVersion.Version.Major >= 6)
            {
                int enabled = 0;
                DwmIsCompositionEnabled(ref enabled);
                return (enabled == 1) ? true : false;
            }
            return false;
        }
        #endregion


    }
}