通过面板移动无边框表单

Question

我一直在为我的问题寻找解决方案，但目前我无法获得任何我想做的成功代码。所以，我有一个没有边框的表单，里面有 2 个自定义面板，所以用户无法点击框架，我想，我实现了一个代码，当用户点击面板时，这将调用一个函数在我的表单上，通过参数接收鼠标事件。 这是我的面板的代码（请注意，我在框架中的两个面板都是同一个类，它只是 2 个不同的实例）

 public class MyPanel : System.Windows.Forms.Panel{

                       (...)

     private void MyPanel_MouseDown(object sender, MouseEventArgs e)
     {
         BarraSms.getInstance().mouseDown(e);
     }

     private void MyPanel_MouseMove(object sender, MouseEventArgs e)
     {
         BarraSms.getInstance().mouseMove(e);
     }

}

这是我的表单代码：

 public partial class BarraSms : Form
{
  private Point mousePoint;

             (...)

   public void mouseDown(MouseEventArgs e) {

        mousePoint = new Point(-e.X, -e.Y);

    }

    public void mouseMove(MouseEventArgs e) {

        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            Point mousePos = Control.MousePosition;
            mousePos.Offset(mousePoint .X, mousePoint .Y);
            this.Location = mousePos;
        }

    }
}

我有什么遗漏的吗？ 提前感谢您的帮助。

工作代码（更新），问题解决：x4rf41

MyPanel 类：

MouseMove += MyPanel_MouseMove; // added in class constructer

BarraSms 类（表单）

public partial class BarraSms : Form
{
    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;


    [DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
    [DllImportAttribute("user32.dll")]
    public static extern bool ReleaseCapture(); 

     public void mouseMove(MouseEventArgs e) {

        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);
            Point loc = this.Location;

            writeCoordToBin(loc.X, loc.Y);

        }

    }

}

Answer 1

使用 windows api 函数有更好的解决方案。 你使用它的方式，当你快速移动表单并且鼠标离开面板时，你会遇到问题。我遇到了完全相同的问题。

试试这个：

using System.Runtime.InteropServices;

在你的 Form 类中

public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;

[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();        

public void mouseMove(MouseEventArgs e) 
{
   if (e.Button == System.Windows.Forms.MouseButtons.Left)
   {
      ReleaseCapture();
      SendMessage(this.Handle,  WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);
   }
}

这个不需要 mouseDown 事件

Answer 2

框架不能调用您在 MyPanel 中的私有方法。您需要按如下方式声明它们：

protected override void OnMouseDown(MouseEventArgs e)
{
    var parent = this.Parent as BarraSms;
    parent.mouseDown(e);
}

protected override void OnMouseMove(MouseEventArgs e)
{
    var parent = this.Parent as BarraSms;
    parent.mouseMove(e);
}

Answer 3

试试这个：

public void mouseMove(MouseEventArgs e) {

    if (e.Button == System.Windows.Forms.MouseButtons.Left)
    {
        Point currentPos = Location;
        currentPos.Offset(e.X + mousePoint.X, e.Y + mousePoint.Y);
        this.Location = currentPos;
    }
    //Or simply use Location.Offset(e.X + mousePoint.X, e.Y + mousePoint.Y);
}

您必须使用Location（表单的当前位置），而不是Control.MousePosition，这是鼠标在屏幕上的位置。

更新：看起来您甚至不知道如何注册事件处理程序，尝试像这样修改您的面板类：

public class MyPanel : System.Windows.Forms.Panel{
  //(...)
 protected override void OnMouseDown(MouseEventArgs e)
 {
     base.OnMouseDown(e);
     BarraSms.getInstance().mouseDown(e);
 }

 protected override void OnMouseMove(MouseEventArgs e)
 {
     base.OnMouseMove(e);
     BarraSms.getInstance().mouseMove(e);
 }

}