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


namespace PTMedicalInsurance.Forms
{
    public partial class PasswordKeyboardForm : Form
    {
        // 导入Windows API函数
        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        private static extern IntPtr GetFocus();

        [DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        private const uint WM_CHAR = 0x0102;

        private IntPtr _targetEditBox;

        public PasswordKeyboardForm(IntPtr targetEditBox)
        {
            InitializeComponent();
            _targetEditBox = targetEditBox;
        }

        public PasswordKeyboardForm()
        {
            InitializeComponent();
        }

        private void SendKeyToFocusedControl(char key)
        {
            IntPtr focusedHandle = GetFocus();
            if (focusedHandle != IntPtr.Zero)
            {
                SendMessage(focusedHandle, WM_CHAR, (IntPtr)key, IntPtr.Zero);
            }
        }

        // 处理按钮点击事件
        private void btn_1_Click(object sender, EventArgs e)
        {           
            Button button = sender as Button;
            if (button != null)
            {
                // 使用 SendKeys 将按钮的文本发送到当前焦点控件
                SendKeys.Send(button.Text);
            }
        }

        // 处理删除按钮点击事件
        private void btn_delete_Click(object sender, EventArgs e)
        {
            SendKeys.Send("{BACKSPACE}");
        }

        // 处理关闭按钮点击事件
        private void btn_Exit_Click(object sender, EventArgs e)
        {
            this.Close(); // 关闭密码键盘
        }

        private void btn_OK_Click(object sender, EventArgs e)
        {
            SendTextToEditBox(sender.ToString());
        }

        // 将文本发送到目标编辑框
        private void SendTextToEditBox(string text)
        {
            if (_targetEditBox != IntPtr.Zero)
            {
                foreach (char c in text)
                {
                    SendMessage(_targetEditBox, WM_CHAR, (IntPtr)c, IntPtr.Zero);
                }
            }
        }

        private void btn_clear_Click(object sender, EventArgs e)
        {
            SendKeys.Send("^{A}"); // 全选
            SendKeys.Send("{DEL}"); // 删除
        }

        private void PasswordKeyboardForm_Load(object sender, EventArgs e)
        {
            this.TopMost = true;
        }
    }
}