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   源码介绍

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

namespace Infographic
{
    public partial class FormHome : Form
    {
        public FormHome()
        {
            InitializeComponent();

        }

        //记录鼠标按键是否按下
        private bool isMouseDown = false;          

        bool haveHandle = false;
        Point oldPoint = new Point(0, 0);

        static int  frameWidth = 1500;//背景宽
        static int frameHeight = 700;//背景高

        int frameX = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Width - frameWidth;
        int frameY = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Height - frameHeight;

        private void InitializeStyles()
        {
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            SetStyle(ControlStyles.UserPaint, true);
            UpdateStyles();
        }
        protected override void OnClosing(CancelEventArgs e)
        {
            e.Cancel = true;
            base.OnClosing(e);
            haveHandle = false;
        }

        protected override void OnHandleCreated(EventArgs e)
        {
            InitializeStyles();
            base.OnHandleCreated(e);
            haveHandle = true;
        }
        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cParms = base.CreateParams;
                cParms.ExStyle |= 0x00080000; // WS_EX_LAYERED
                return cParms;
            }
        }

        private void FormHome_Load(object sender, EventArgs e)
        {

            this.SetDesktopLocation(frameX, frameY); //设置窗体打开后在显示器上的坐标

            SetBits(global::Infographic.Properties.Resources.wsj2015_2);

        }

        public void SetBits(Bitmap bitmap)
        {
            if (!haveHandle) return;

            if (!Bitmap.IsCanonicalPixelFormat(bitmap.PixelFormat) || !Bitmap.IsAlphaPixelFormat(bitmap.PixelFormat))
                throw new ApplicationException("The picture must be 32bit picture with alpha channel.");

            IntPtr oldBits = IntPtr.Zero;
            IntPtr screenDC = Win32.GetDC(IntPtr.Zero);
            IntPtr hBitmap = IntPtr.Zero;
            IntPtr memDc = Win32.CreateCompatibleDC(screenDC);

            try
            {
                Win32.Point topLoc = new Win32.Point(Left, Top);
                Win32.Size bitMapSize = new Win32.Size(bitmap.Width, bitmap.Height);
                Win32.BLENDFUNCTION blendFunc = new Win32.BLENDFUNCTION();
                Win32.Point srcLoc = new Win32.Point(0, 0);

                hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
                oldBits = Win32.SelectObject(memDc, hBitmap);

                blendFunc.BlendOp = Win32.AC_SRC_OVER;
                blendFunc.SourceConstantAlpha = 255;
                blendFunc.AlphaFormat = Win32.AC_SRC_ALPHA;
                blendFunc.BlendFlags = 0;

                Win32.UpdateLayeredWindow(Handle, screenDC, ref topLoc, ref bitMapSize, memDc, ref srcLoc, 0, ref blendFunc, Win32.ULW_ALPHA);
            }
            finally
            {
                if (hBitmap != IntPtr.Zero)
                {
                    Win32.SelectObject(memDc, oldBits);
                    Win32.DeleteObject(hBitmap);
                }
                Win32.ReleaseDC(IntPtr.Zero, screenDC);
                Win32.DeleteDC(memDc);
            }
        }

        private void FormHome_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                oldPoint = e.Location;

                isMouseDown = true;
            }
            if (e.Button == MouseButtons.Right)
            {
                contextMenuStrip.Show(this, e.Location);
            }
        }

        private void FormHome_MouseMove(object sender, MouseEventArgs e)
        {
            if (isMouseDown)
            {
                this.Left  = (e.X - oldPoint.X);
                this.Top  = (e.Y - oldPoint.Y);
            }
        }

        private void FormHome_MouseUp(object sender, MouseEventArgs e)
        {
            //   修改鼠标状态isMouseDown的值 
            //   确保只有鼠标左键按下并移动时，才移动窗体 
            if (e.Button == MouseButtons.Left)
            {
                isMouseDown = false;
            }
        }

        private void FormHome_DoubleClick(object sender, EventArgs e)
        {

        }

        //退出
        private void tsmExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        //帮助
        private void tsmHelp_Click(object sender, EventArgs e)
        {
            MessageBox.Show("帮助");
        }
        //关于
        private void tsmAbout_Click(object sender, EventArgs e)
        {

            MessageBox.Show("关于");
        }


    }
}