How do I make mousedrag inside Panel move form window?

Question

I have this System.Windows.Forms.Panel that I want to enable so that if the user click and drags the mouse drags the window around to.

Can I do this? Do i have to implement multiple events?

Answer 1

The Solution that works best for me is using unmanaged code, which gives you smooth window movements unlike the answer posted by HatSoft.

3 small steps to drag your window on Panel movement

using System.Runtime.InteropServices;

add these six lines inside your class

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

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

and your MouseMove event on Panel should look like this

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
   if (e.Button == MouseButtons.Left)
   {
      ReleaseCapture();
      SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
   }
}

posted it a little late :) , who knows we might need it again in future.

Answer 2

You can achieve it by using the MouseMove Event of the panel

Example should be something like this (Sorry have not tested it)

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        this.Location = new Point(Cursor.Position.X + e.X , Cursor.Position.Y + e.Y);
    }
}

Answer 3

You might want to take a look at this component that I pasted here:

http://pastebin.com/5ufJmuay

It is a component that you will be able to drop on a form, and then drag the form by dragging inside it.

Answer 4

Currently Set For A Panel. VS C# Just Messing About Seems to work for me as I wanted Sets application left-top corner to mouse position while left-click is pressed.

 public form1()
    {
        InitializeComponent();
        this.panel2.MouseMove += new MouseEventHandler(panel2_MouseMove);
    }
    
    public const int WM_NCLBUTTONDOWN = 0xA1;
    public const int HT_CAPTION = 0x2;

    [DllImportAttribute("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
    
    private void panel2_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            
            Point loc1 = MousePosition;
            this.Location = loc1;
        }
    }

Answer 5

Hey Hope this works for you

1. First you have to put a panel on your form and dock it to top
2. Then add these lines of codes

using System.Runtime.InteropServices;

public partial class Main_FM : Form
{

  [DllImport("user32.dll", EntryPoint = "ReleaseCapture")]
    private extern static void ReleaseCapture();

  [DllImport("user32.dll", EntryPoint = "SendMessage")]
    private extern static void SendMessge(System.IntPtr hwnd, int wmsg, int wparam, int lparam);

}

3. The create the MouseDown event on the panel and add these codes:

 private void Top_PNL_MouseDown(object sender, MouseEventArgs e)
  {
      ReleaseCapture();
      SendMessge(this.Handle, 0x112, 0xf012, 0);
  }

Answer 6

Bravo 的代码工作得非常好，但是直到我在我想要移动的面板的->properties->event 部分中明确启用 MouseMove 事件之前，我无法让它工作。