NOTRESIZABLELISTVIEW : FIGER LA LARGEUR DES COLONNES

//COPYRIGHT Original author ....

	public class NotResizableListView: ListView 
	{		
		#region Interop
		#region Consts
		const int LVM_FIRST = 0x1000;    
		const int LVM_GETHEADER = LVM_FIRST + 31;    
		const int HDM_FIRST = 0x1200;
		const int HDM_HITTEST = HDM_FIRST + 6;        
		const int HHT_ONDIVIDER = 0x0004;    
		const int WM_SETCURSOR = 0x0020;    
		const int WM_LBUTTONDOWN = 0x0201;        
		#endregion Consts

		[StructLayout(LayoutKind.Sequential)]    
			struct HDHITTESTINFO    
		{
			public Point pt;        
			public int flags;       
			public int iItem;    
		}        
		[DllImport("User32.dll")]    
		static extern int SendMessage(IntPtr hWnd, int uMsg, IntPtr wParam, IntPtr lParam); 

		#endregion Interop

		protected override void OnHandleCreated(EventArgs e)    
		{       
			base.OnHandleCreated(e);     
			//Recupere l'objet columnheader.
			IntPtr hHeader = (IntPtr)SendMessage(Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);  
			ColumnHeader nativeWindow = new ColumnHeader(hHeader);  
		}   
		
		private class ColumnHeader : NativeWindow    
		{       
			public ColumnHeader(IntPtr hHeader)
			{ 
				this.AssignHandle(hHeader);       
			}   
    
			protected override void WndProc(ref Message m)
			{
				switch(m.Msg)          
				{             
					case WM_SETCURSOR:                
						// Pas de changement de curseur
						return;             
					case WM_LBUTTONDOWN:              
						Int16 x = (Int16)m.LParam;                
						Int16 y = (Int16)((int)m.LParam >> 16);
						// Recuepere la position du cursor
						Point cursorPosition = new Point(x, y);
						HDHITTESTINFO hitInfo = new HDHITTESTINFO();
						hitInfo.pt = cursorPosition;                
						IntPtr buffer = Marshal.AllocHGlobal(Marshal.SizeOf(hitInfo));                
						Marshal.StructureToPtr(hitInfo, buffer, true);         
						//Declenche le hit, permet l'execution des autres actions lié au click sur le header
						SendMessage(m.HWnd, HDM_HITTEST, IntPtr.Zero, buffer); 
						hitInfo = (HDHITTESTINFO)Marshal.PtrToStructure(buffer, typeof(HDHITTESTINFO));
						Marshal.FreeHGlobal(buffer);                
						if (hitInfo.flags == HHT_ONDIVIDER)                   
							//On est sur le separateur donc pas d'action
							return;                
						break;          
				}

				base.WndProc(ref m);       
			}    
		} 
	
	}