winform 屏幕右上角悬浮窗demo

当窗体最小化时，显示右悬浮窗！！！

1新建右上角小窗口

（1）去除边框 （2）最前显示（设置背景图案）

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

namespace TopMost
{
    public partial class frmTopMost : Form
    {
        private Point ptMouseCurrentPos, ptMouseNewPos, ptFormPos, ptFormNewPos;
        private bool blnMouseDown = false;
        private frmMain pParent;
        //Add ContextMenuStrip .
        private ContextMenuStrip docMenu;

        public frmTopMost(frmMain pMain)
        {
            InitializeComponent();
            pParent=pMain;
        }

        private void frmTopMost_Load(object sender, EventArgs e)
        {
            this.FormBorderStyle = FormBorderStyle.None;
            this.TopMost = true;
            this.Show();
            this.Top = 100;
            this.Left = Screen.PrimaryScreen.Bounds.Width - 200;
            this.Width = 35;
            this.Height = 35;

            docMenu = new ContextMenuStrip();
            
            ToolStripMenuItem OpenLable = new ToolStripMenuItem();
            OpenLable.Text = "Open";
            OpenLable.Click+=new EventHandler(OpenLable_Click);
            ToolStripMenuItem ExitLable = new ToolStripMenuItem();
            ExitLable.Text = "Exit";
            ExitLable.Click+=new EventHandler(ExitLable_Click);

            docMenu.Items.AddRange(new ToolStripMenuItem[] { OpenLable,ExitLable});
            this.ContextMenuStrip = docMenu;
        }
        private void frmTopMost_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (blnMouseDown)
            {
                //Get the current postion of the mouse in the screen.
                ptMouseNewPos = Control.MousePosition;

                //Set window postion.
                ptFormNewPos.X = ptMouseNewPos.X - ptMouseCurrentPos.X + ptFormPos.X;
                ptFormNewPos.Y = ptMouseNewPos.Y - ptMouseCurrentPos.Y + ptFormPos.Y;

                //Save window postion.
                Location = ptFormNewPos;
                ptFormPos = ptFormNewPos;

                //Save mouse pontion.
                ptMouseCurrentPos = ptMouseNewPos;
            }
        }

        private void frmTopMost_MouseDown(object sender,System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                blnMouseDown = true;

                //Save window postion and mouse postion.
                ptMouseCurrentPos = Control.MousePosition;
                ptFormPos = Location;
            }
        }

        private void frmTopMost_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                blnMouseDown = false;
            }
        }
        //Restore parent from.
        private void frmTopMost_DoubleClick(object sender, System.EventArgs e)
        {
            SwitchToMain();
        }
        private void SwitchToMain()
        {
            pParent.RestoreWindow();
            this.Hide();
        }

        #region  //Context events.
        private void OpenLable_Click(object sender, System.EventArgs e)
        {
            SwitchToMain();
        }
        private void ExitLable_Click(object sender, System.EventArgs e)
        {
            Application.Exit();
        }
        #endregion

        private void frmTopMost_MouseEnter(object sender, System.EventArgs e)
        {
            this.toolTip1.Active = true;
            this.toolTip1.AutoPopDelay = 500000;
            this.toolTip1.InitialDelay = 500;
            this.toolTip1.ReshowDelay = 100;
            this.toolTip1.ShowAlways = true;
        }
        private void frmTopMost_MouseLeave(object sender, System.EventArgs e)
        {
            this.toolTip1.Active = false;
        }

    }
}

2、主窗体

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

namespace TopMost
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        private FormWindowState fwsPrevious;
        private frmTopMost myTopMost;
        private void frmMain_Load(object sender, EventArgs e)
        {
            //save the windowState;
            fwsPrevious = this.WindowState;

            //Create top most window;
            myTopMost = new frmTopMost(this);
        }

        private void frmMain_SizeChanged(object sender,EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                //window minimized.
                //show the most window.
                myTopMost.Show();
                this.ShowInTaskbar = false;
            }
            else if(this.WindowState!=fwsPrevious)
            {
                fwsPrevious = WindowState;
            }
        }
        //Restore window.
        public void RestoreWindow()
        {
            this.WindowState = fwsPrevious;
            this.ShowInTaskbar = true;
        }
    }
}

完！！