Colorful effect-Fade-in and fade-out forms

Colorful effect-Fade-in and fade-out forms

In actual projects, forms are often popped up. To avoid being so abrupt, you can add excessive animation effects. Fade-in and fade-out is a common animation.

 1 using System; 2 using System.Windows.Forms; 3  4 namespace TestFormEffect 5 { 6     public partial class Form1 : Form 7     { 8         private readonly Timer _timer; 9         private readonly double _inspeed;10         private readonly double _outspeed;11 12         private State _state;13 14         public const float Precision = 0.000001f;15 16         public Form1()17         {18             InitializeComponent();19             _timer=new Timer();20             _timer.Tick += timer1_Tick; 21             _timer.Enabled = false;22 23             _inspeed = 20;24             _outspeed = 20;25         }26 27         private void Form1_Load(object sender, EventArgs e)28         {29             _state = State.In;30             _timer.Enabled = true;31             Opacity = 0;32         }33 34         private void timer1_Tick(object sender, EventArgs e)35         {36             switch (_state)37             {38                 case State.In:39                     Opacity += _inspeed/100;40                     if (1 - Opacity <= Precision)41                     {42                         _timer.Enabled = false;43                     }44                     break;45                 case State.Out:46                     Opacity -= _outspeed/100;47                     if (Opacity <= Precision)48                     {49                         this.Close();50                         _timer.Enabled = false;51                     }52                     break;53             }54         }55 56         private void Form1_FormClosing(object sender, FormClosingEventArgs e)57         {58             e.Cancel = true;59             _state = State.Out;60             _timer.Enabled = true;61         }62 63     }64 65     enum State66     {67         In=1,68         Out69     }70 }