using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Runtime.InteropServices;

namespace formula_manage
{
    /// <summary>
    /// Login.xaml 的交互逻辑
    /// </summary>
    public partial class Login : Window
    {
        [DllImport("user32.dll", SetLastError = true)]
        static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);
        public static void PressKey(Keys key, bool up)
        {
            const int KEYEVENTF_EXTENDEDKEY = 0x1;
            const int KEYEVENTF_KEYUP = 0x2;
            if (up)
            {
                keybd_event((byte)key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr)0);
            }
            else
            {
                keybd_event((byte)key, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr)0);
            }
        }

        public Login()
        {
            WindowStartupLocation = WindowStartupLocation.CenterScreen;
            InitializeComponent();
        }

        private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            Regex re = new Regex("^[1-9]+[0-9]*$");

            e.Handled = !re.IsMatch(e.Text);
        }

        private void Button_Click(object sender, RoutedEventArgs e)  //退出按钮事件
        {
            this.Close();
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)  //登录按钮事件
        {
            if ((User.Text == "engineer" || User.Text == "ENGINEER") && (Pasword.Password == "engineer" || Pasword.Password == "ENGINEER"))
            {
                Window window = Window.GetWindow(this);
                MainWindow Main = new MainWindow();
                window.Close();
                Main.ShowDialog();//实例化并置顶打开信息窗口
            }
            else
            {
                System.Windows.MessageBox.Show("账号或密码错误");
            }
        }

        private void SearchBox_OnKeyDownd(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                //SendKeys.SendWait("{Tab}");
                PressKey(Keys.Tab, false);
                PressKey(Keys.Tab, true);
            }
        }

       private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            PressKey(Keys.Tab, false);
            PressKey(Keys.Tab, true);
        }
    }
}