using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Text;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace DanMu

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            Rectangle rec = Screen.GetWorkingArea(this);

            this.Height = rec.Height / 3 * 2; // 3分之2

            this.Width = rec.Width;

            this.Location = new Point(0, 0);

            this.BackColor = Color.White;

            this.TransparencyKey = Color.White;

            this.Opacity = 1;

            AddTanMu("你开启了弹幕");

            //测试运行

            Thread th1 = new Thread(new ThreadStart(test));

            th1.Start();

        }

        private void test()

        {

            while (true)

            {

                AddTanMu(Guid.NewGuid().ToString());

                Thread.Sleep(new Random().Next(2000, 3500));

            }

        }

        public void AddTanMu(String word)

        {

            Label label = new Label();

            label.Text = word;

            label.AutoSize = true;

            label.ForeColor = Color.Red;

            label.BackColor = Color.Transparent;

            label.Font = new Font("宋体", 20);

            label.Location = new Point(this.Width, new Random().Next(this.Height - label.Height));

            this.Invoke(new Action(() =>

            {

                this.Controls.Add(label);

            }));

        }

        private void Timer_Tick(object sender, EventArgs e)

        {

            //方法1：

            //foreach (Label label in this.Controls)

            //{

            //    Task.Run(() =>

            //    {

            //        //单独执行的委托，防止卡顿

            //        label.Invoke(new Action(() =>

            //        {

            //            //步数、速度

            //            for (int v = 0; v < 3; v++)

            //            {

            //                label.Left -= 2;

            //            }

            //        }));

            //        //超出移除

            //        if (label.Left + label.Width < 0)

            //        {

            //            this.Invoke(new Action(() =>

            //            {

            //                this.Controls.Remove(label);

            //                label.Dispose();

            //            }));

            //        }

            //    });

            //}

            //方法2：

            foreach (Label label in this.Controls)

            {

                label.Invoke(new Action(() =>

                {

                    //步数、速度

                    //【3（次数）*2（步数）=6（速度）】

                    for (int v = 0; v < 3; v++)

                    {

                        label.Left -= 2;

                    }

                }));

                //超出移除

                if (label.Left + label.Width < 0)

                {

                    label.Visible = false;

                    this.Controls.Remove(label);

                }

            }

        }

    }

}