• c# 制作悬浮框


    一,制作winform 窗体

    窗体要做小一点,你见过500*500的悬浮框吗?

    二,去掉边框和标题栏

       this.FormBorderStyle = FormBorderStyle.None;

      运行出来如下所示:

      

    三,在窗体中拖放label 控件

      因为准备在悬浮框中放置gif动画,

              labelex.AutoSize = false;
                    labelex.Left = 0;
                    labelex.Top = 0;
                    labelex.Width = this.Width;
                    labelex.Height = this.Height;

    四,拖拉label事件

    const int WM_NCHITTEST = 0x0084;
            const int HTCLIENT = 0x0001;
            const int HTCAPTION = 0x0002;
            private Point ptMouseCurrrnetPos, ptMouseNewPos, ptFormPos, ptFormNewPos;
            public  bool blnMouseDown = false;
    
            [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;
    
            const int WM_NCLBUTTONDBLCLK = 0xA3;
            public const int WM_RBUTTONDOWN = 0x0204;
            public const int WM_LBUTTONDOWN = 0x0201;
     private void labelex_MouseDown(object sender, MouseEventArgs e)
            {
                if (e.Button == MouseButtons.Left)
                {
                    blnMouseDown = true;
                    // Save window position and mouse position
                    ptMouseCurrrnetPos = Control.MousePosition;
                    ptFormPos = Location;
                }
    
                ReleaseCapture();
                //SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
            }
    
            private void labelex_MouseUp(object sender, MouseEventArgs e)
            {
                if (e.Button == MouseButtons.Left)
                    //Return back signal
                    blnMouseDown = false;
            }
    
            private void labelex_MouseMove(object sender, MouseEventArgs e)
            {
                if (blnMouseDown)
                {
                    //Get the current position of the mouse in the screen
                    ptMouseNewPos = Control.MousePosition;
                    //Set window position
                    ptFormNewPos.X = ptMouseNewPos.X - ptMouseCurrrnetPos.X + ptFormPos.X;
                    ptFormNewPos.Y = ptMouseNewPos.Y - ptMouseCurrrnetPos.Y + ptFormPos.Y;
                    //Save window position
                    Location = ptFormNewPos;
                    ptFormPos = ptFormNewPos;
                    //Save mouse position
                    ptMouseCurrrnetPos = ptMouseNewPos;
    
                }
            }
        }

    五,将窗体置于最顶端

      将窗体属性TopMost = True,这样窗体就可以不被其他窗体覆盖,置于屏幕的最顶端了。

      

    六,这样一个简单的悬浮框 就做好了。可以手动尝试一下。

      

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  • 原文地址:https://www.cnblogs.com/techdreaming/p/7931286.html
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