简易密码输入自定义控件示例 含自定义事件 可在调用窗口事件视图中看到事件名

    public partial class MyCheckBox : UserControl
    {
        string text=string.Empty;
        bool bAutoSrcoll=true;
        Size sSize;
        public MyCheckBox()
        {
            InitializeComponent();
            textBox1.TextChanged +=new EventHandler(Right_Click);
        }

        [Description("文本框内输入的内容")]
        public string MyText
        {
            get { return text; }
            set
            {
                textBox1.Text = value;
                text = value;
            }
        }
        [Description("光标跟随编辑位置")]
        public bool AutoSrcoll
        {
            get { return bAutoSrcoll; }
            set
            {
                bAutoSrcoll = value;
            }
        }

     //   [Description("文本更改")]

        public delegate void RTextChangedEventHandler(object sender, RTextChangedEventArgs e);//事件所需的委托

        //当颜色改变时触发事件
        public  event RTextChangedEventHandler RTextChanged;//定义一个ColorChanged事件

        protected virtual void OnTextChanged(RTextChangedEventArgs e)
        {//事件触发方法
            if (RTextChanged != null)
            {//判断事件是否为空
                RTextChanged(this, e);//触发事件
            }
        }
        public class RTextChangedEventArgs : EventArgs
        {
            public string str;
            public RTextChangedEventArgs()
            {
                str = "right";
            }
        }

        private void Right_Click(object sender, EventArgs e)
        {
            RTextChanged(this, new RTextChangedEventArgs());
        }

 

 

 

 

 

 

 

 

        private void SetSign(int Position)
        {
            string temp = string.Empty;
            for (int i = 0; i < textBox1.Text.Length; i++)
            {
                temp += @"*";
            }
            textBox1.Text = temp;
            if (bAutoSrcoll == true)
            {
                textBox1.Select(Position + 1, 0);
            }
            else
            {
                textBox1.Select(textBox1.Text.Length, 0);
            }
            textBox1.ScrollToCaret();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (MyText.Length == textBox1.Text.Length) //显示回显
            {
                string tmp = textBox1.Text.Replace(@"*", "");
                if (tmp.Trim().Length != 0)
                {
                    SetSign(textBox1.Text.Length);
                }
                return;
            }

            //输入空，不需回显
            if (string.IsNullOrEmpty(textBox1.Text) == true)
            {
                text = string.Empty;
                return;
            }

            string input = textBox1.Text.Replace(@"*", "");
            if (input == string.Empty)//输入*号，不需回显
            {
                text = text + @"*";
                return;
            }
            else
            {
                int inputset = textBox1.Text.LastIndexOf(input);
                if (inputset == text.Length)//追加
                {
                    text += input;
                }
                else//插入
                    text = text.Insert(inputset, input);

                SetSign(inputset);
             
            }   
        }
    }