摘录的WinForm Control 开发5,WinForm 开发：FlashGetFormDemos ，类似FlashGet的悬浮窗

主窗体中有做两个处理：

1，主窗体在最小化时，悬浮窗显示

    代码：

        void MainFormSizeChanged(object sender, EventArgs e)
        {
            if( this.WindowState == FormWindowState.Minimized )
            {
                topMostForm.Show();
                this.ShowInTaskbar = false;
            }
            else if( this.WindowState != previouseState )
            {
                previouseState = this.WindowState;
            }
        }

2，提供还原主窗口的方法

        /// <summary>
        /// 还原主窗口
        /// </summary>
        public void RestoreWindowState()
        {
            this.WindowState=previouseState;
            this.ShowInTaskbar=true;
        }

 悬浮窗处理：

1，设置窗口状态为None，以去掉窗体边框

   this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

2，Load事件里，亮点是设置窗口的透明度

   代码：

        /// <summary>
        /// 设置透明
        /// </summary>
        private void SetClarity(double prameter)
        {
            this.Opacity=prameter;
        }

 3，悬浮窗的鼠标事件：

   代码：

void TopMostFormMouseDown(object sender, MouseEventArgs e)
        {
            if(e.Button==MouseButtons.Left)
            {
                blnMouseDown = true;
     
                // 保存当前，鼠标位置，窗口位置
                ptMouseCurrrnetPos = Control.MousePosition;
                ptFormPos = Location;
            }
        }
        
        void TopMostFormMouseUp(object sender, MouseEventArgs e)
        {
            if(e.Button==MouseButtons.Left)
            {
                blnMouseDown=false;
            }
        }
        
        void TopMostFormMouseMove(object sender, MouseEventArgs e)
        {
            if( blnMouseDown )
            {
                //获取当前鼠标位置
                ptMouseNewPos = Control.MousePosition;
     
                //设置窗口位置
                ptFormNewPos.X = ptMouseNewPos.X - ptMouseCurrrnetPos.X + ptFormPos.X;
                ptFormNewPos.Y = ptMouseNewPos.Y - ptMouseCurrrnetPos.Y + ptFormPos.Y;
     
                //设置窗口位置
                Location = ptFormNewPos;
                ptFormPos = ptFormNewPos;
     
                //保存鼠标位置
                ptMouseCurrrnetPos = ptMouseNewPos;
            } 
        }

 4、转换为主窗口的函数：

   代码：

     void TopMostFormDoubleClick(object sender, EventArgs e)
        {
            SwitchToMainForm();
        }
        
        void SwitchToMainForm()
        {
            this.mainForm.RestoreWindowState();
            this.Hide();
        }

 /Files/csharponworking/FlashFormDemos.zip