Colorful form-fade in and fade out

Colorful form-fade in and fade out

In actual projects, we often need pop-up forms to interact with users. To make the pop-up forms not so abrupt, we can add some conversion effects. fade in and fade out is one of them.

using System;using System.Windows.Forms;namespace TestFormEffect{    public partial class Form1 : Form    {        private readonly Timer _timer;        private readonly double _inspeed;        private readonly double _outspeed;        private State _state;        public const float Precision = 0.000001f;        public Form1()        {            InitializeComponent();            _timer=new Timer();            _timer.Tick += timer1_Tick;             _timer.Enabled = false;            _inspeed = 20;            _outspeed = 20;        }        private void Form1_Load(object sender, EventArgs e)        {            _state = State.In;            _timer.Enabled = true;            Opacity = 0;        }        private void timer1_Tick(object sender, EventArgs e)        {            switch (_state)            {                case State.In:                    Opacity += _inspeed/100;                    if (1 - Opacity <= Precision)                    {                        _timer.Enabled = false;                    }                    break;                case State.Out:                    Opacity -= _outspeed/100;                    if (Opacity <= Precision)                    {                        this.Close();                        _timer.Enabled = false;                    }                    break;            }        }        private void Form1_FormClosing(object sender, FormClosingEventArgs e)        {            e.Cancel = true;            _state = State.Out;            _timer.Enabled = true;        }    }    enum State    {        In=1,        Out    }}