WinForm利用 WinApi实现 淡入淡出 弹出 效果 仿QQ消息

消息框：

using System.Runtime.InteropServices;

namespace Windows_API_实现屏幕右下角_消息框_
{
    public partial class Msg : Form
    {
        public Msg()
        {
            InitializeComponent();
            Point p = new Point(Screen.PrimaryScreen.WorkingArea.Width - this.Width - 3, Screen.PrimaryScreen.WorkingArea.Height - this.Height - 3);
            this.PointToScreen(p);
            this.Location = p;
        }

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;

        private void FrmLogin_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

        private Thread td;
        delegate void SetTextCallBack(string txt);
        private void Msg_Load(object sender, EventArgs e)
        {
            OnLoad();
        }
        private void SetText(string txt)
        {
            if (string.IsNullOrEmpty(txt))
                return;
            string first = txt.Substring(0, 1);
            string second = txt.Substring(1, txt.Length - 1);
            string thrid = second + first;
            if (lblMsg.InvokeRequired)
            {
                SetTextCallBack cb = new SetTextCallBack(SetText);
                BeginInvoke(cb, thrid);
            }
            else
                lblMsg.Text = thrid;
        }

        private void Msg_FormClosing(object sender, FormClosingEventArgs e)
        {
            td.Abort();
        }

        internal void OnLoad()
        {
            td = new Thread(() =>
            {
                while (true)
                {
                    SetText(lblMsg.Text);
                    Thread.Sleep(200);
                }
            });
            td.Start();
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

namespace Windows_API_实现屏幕右下角_消息框_
{
    partial class Msg
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Msg));
            this.lblMsg = new System.Windows.Forms.Label();
            this.btnClose = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // lblMsg
            // 
            this.lblMsg.BackColor = System.Drawing.Color.Transparent;
            this.lblMsg.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.lblMsg.ForeColor = System.Drawing.Color.DarkGreen;
            this.lblMsg.Location = new System.Drawing.Point(3, 162);
            this.lblMsg.Name = "lblMsg";
            this.lblMsg.Size = new System.Drawing.Size(269, 23);
            this.lblMsg.TabIndex = 0;
            this.lblMsg.Text = "Hello~ WinAPI 实现屏幕右下角“消息框”                       ";
            this.lblMsg.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            // 
            // btnClose
            // 
            this.btnClose.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("btnClose.BackgroundImage")));
            this.btnClose.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
            this.btnClose.Location = new System.Drawing.Point(244, 0);
            this.btnClose.Name = "btnClose";
            this.btnClose.Size = new System.Drawing.Size(39, 26);
            this.btnClose.TabIndex = 1;
            this.btnClose.UseVisualStyleBackColor = true;
            this.btnClose.Click += new System.EventHandler(this.btnClose_Click);
            // 
            // Msg
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
            this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Zoom;
            this.ClientSize = new System.Drawing.Size(285, 190);
            this.Controls.Add(this.btnClose);
            this.Controls.Add(this.lblMsg);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Name = "Msg";
            this.Text = "Msg";
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Msg_FormClosing);
            this.Load += new System.EventHandler(this.Msg_Load);
            this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.FrmLogin_MouseDown);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Label lblMsg;
        private System.Windows.Forms.Button btnClose;
    }
}

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