using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace FormTrans
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            base.SetStyle(ControlStyles.DoubleBuffer
    | ControlStyles.AllPaintingInWmPaint,
  true);
            InitializeComponent();
        }
        public const int WS_EX_WINDOWEDGE = 0x100; //窗口具有凸起的3D边框 
        public const int WS_EX_CLIENTEDGE = 0x200; //窗口具有阴影边界 
        public const int WS_EX_TOOLWINDOW = 0x80; //小标题工具窗口 
        public const int WS_EX_TOPMOST = 0x8; //窗口总在顶层 
        public const int WS_EX_OVERLAPPEDWINDOW = (WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE); //WS_EX-CLIENTEDGE和WS_EX_WINDOWEDGE的组合 
        public const int WS_EX_PALETTEWINDOW = (WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST); //WS_EX_WINDOWEDGE和WS_EX_TOOLWINDOW和WS_EX_TOPMOST的组合 
        public const int WS_EX_DLGMODALFRAME = 0x1; //带双边的窗口 
        public const int WS_EX_NOPARENTNOTIFY = 0x4; //窗口在创建和销毁时不向父窗口发送WM_PARENTNOTIFY消息 
        public const int WS_EX_TRANSPARENT = 0x20; //窗口透眀 
        public const int WS_EX_MDICHILD = 0x40; //MDI子窗口 
        public const int WS_EX_CONTEXTHELP = 0x400; //标题栏包含问号联机帮助按钮 
        public const int WS_EX_RIGHT = 0x1000; //窗口具有右对齐属性 
        public const int WS_EX_RTLREADING = 0x2000; //窗口文本自右向左显示 
        public const int WS_EX_LEFTSCROLLBAR = 0x4000; //标题栏在客户区的左边 
        public const int WS_EX_CONTROLPARENT = 0x10000; //允许用户使用Tab键在窗口的子窗口间搜索 
        public const int WS_EX_STATICEDGE = 0x20000; //为不接受用户输入的项创建一个三维边界风格 
        public const int WS_EX_APPWINDOW = 0x40000; //在任务栏上显示顶层窗口的标题按钮 
        public const int WS_EX_LAYERED = 0x80000; //窗口具有透眀属性(Win2000)以上 
        public const int WS_EX_NOINHERITLAYOUT = 0x100000; //窗口布局不传递给子窗口(Win2000)以上 
        public const int WS_EX_LAYOUTRTL = 0x400000; //水平起点在右边的窗口 
        public const int WS_EX_NOACTIVATE = 0x8000000; //窗口不会变成前台窗口(Win2000)以上 
        public const int WS_EX_LEFT = 0x0; //窗口具有左对齐属性 
        public const int WS_EX_LTRREADING = 0x0; //窗口文本自左向右显示 
        public const int WS_EX_RIGHTSCROLLBAR = 0x0; //垂直滚动条在窗口的右边界 
        public const int WS_EX_ACCEPTFILES = 0x10; //接受文件拖曳 
        public const int WS_EX_COMPOSITED = 0x2000000; //窗体所有子窗口使用双缓冲从低到高绘制(XP) 
 
        private const int GWL_STYLE = (-16);
        private const int GWL_EXSTYLE = (-20);
        private const int LWA_ALPHA = 0x2;

        [DllImport("user32", EntryPoint = "SetWindowLong")]
        private static extern uint SetWindowLong(
        IntPtr hwnd,
        int nIndex,
        uint dwNewLong
        );

        [DllImport("user32", EntryPoint = "GetWindowLong")]
        private static extern uint GetWindowLong(
        IntPtr hwnd,
        int nIndex
        );

        [DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
        private static extern int SetLayeredWindowAttributes(
        IntPtr hwnd,
        int crKey,
        int bAlpha,
        int dwFlags
        );

        [DllImport("user32.dll")]
        public static extern IntPtr GetActiveWindow();

        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr handle, ref RECT lpRect);

        [Serializable, StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }
 
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            this.ShowInTaskbar = false;
            this.timer2.Interval = 1000 * 60 * 15;
            this.timer3.Interval = 10000;
            SetPenetrate();
            
        }

        /// <summary>
        /// 设置窗体具有鼠标穿透效果
        /// </summary>
        public void SetPenetrate()
        {
            this.TopMost = true;
            GetWindowLong(this.Handle, GWL_EXSTYLE);
            SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
            SetLayeredWindowAttributes(this.Handle, 0, 20, LWA_ALPHA);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.DrawString("你需要休息一下了", this.Font, Brushes.Yellow, e.ClipRectangle);
            base.OnPaint(e);
        }

        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        float _Opacity = 0.01f;
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (this.Opacity < 0.05f)
            { 
                _Opacity = _Opacity * -1;
            }
            if (this.Opacity >0.2f)
            { 
                _Opacity = _Opacity * -1;
            }
            this.Opacity = this.Opacity + _Opacity;
        }

        protected override CreateParams CreateParams
        {
            get
            { 
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= WS_EX_NOACTIVATE;
                return cp;
            }
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            if (!this.Visible)
            {
                IntPtr hwnd = GetActiveWindow();
                RECT rect = new RECT();
                if (GetWindowRect(hwnd, ref   rect))
                {
                    this.Width = rect.right - rect.left;
                    this.Height = rect.bottom - rect.top;
                    this.Left = rect.left;
                }
            }
            this.Opacity = 0.2f;
            this.timer3.Enabled = true;
            this.Visible = true;
        }

        private void timer3_Tick(object sender, EventArgs e)
        {
            this.Visible = false;
            this.timer3.Enabled = false;
        } 
    }
}