C#自定义软键盘控件及应用

自定义控件代码：

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

namespace WindowsFormsApp软键盘应用
{
    public partial class SoftKey : UserControl
    {
        public SoftKey()
        {
            InitializeComponent();
        }
        //属性
        private string str = "";
        public string Str
        {
            get { return str; }
            set { str = value; Invalidate(); }
        }
        void btn_A_Click(object sender, EventArgs e)
        {
            textBox1.Text += "-";
            textBox1.SelectionStart = textBox1.Text.Length;
        }
        void btn_B_Click(object sender, EventArgs e)
        {
            textBox1.Text += ".";
            textBox1.SelectionStart = textBox1.Text.Length;
        }
        void btn_Click(object sender, EventArgs e)
        {
            Button B = (Button)sender;
            textBox1.Text += B.Name.Substring(4, 1);
            textBox1.SelectionStart = textBox1.Text.Length;
        }
        void btnESC_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length > 0)
            {
                textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1, 1);
            }
        }
        void btnCLR_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }
        public event EventHandler BtnTestClick;
        void btnENT_Click(object sender, EventArgs e)
        {
            str = textBox1.Text;
            textBox1.Text = "";
            this.Hide();
            if (BtnTestClick != null)
            {
                BtnTestClick(sender, e);
            }
        }
    }
}

窗体应用：
将生成的控件拖入窗体中
代码如下：

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;

namespace WindowsFormsApp软键盘应用
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            softKey1.Hide();
        }
        private void textBox1_Click(object sender, EventArgs e)
        {
            softKey1.Str = "";
       
            softKey1.Show();
        }

        private void softKey1_BtnTestClick(object sender, EventArgs e)
        {
            textBox1.Text += softKey1.Str;
            textBox1.SelectionStart = textBox1.Text.Length;
        }
    }
}