using System;
using System.Drawing;
using System.Windows.Forms;

namespace UAS_LabelMachine.CustomControl
{
    public partial class NumOnlyTextBox : TextBox
    {
        private bool Negative1;

        public NumOnlyTextBox()
        {
            InitializeComponent();
        }
        //通过标识来判断是否允许输入负数
        public bool Negative
        {
            get
            {
                return Negative1;
            }

            set
            {
                Negative1 = value;
            }
        }

        private void NumOnlyTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            // 允许输入:数字、退格键(8)、全选(1)、复制(3)、粘贴(22)
            if (!char.IsDigit(e.KeyChar) && e.KeyChar != 8 && e.KeyChar != 1 && e.KeyChar != 3 && e.KeyChar != 22)
            {
                e.Handled = true;
            }
        }

        private void NumOnlyTextBox_Leave(object sender, EventArgs e)
        {
            this.BackColor = Color.White;
        }

        private void NumOnlyTextBox_Enter(object sender, EventArgs e)
        {
            this.BackColor = Color.GreenYellow;
        }
    }
}