/// <summary>Occurs when a Windows message is dispatched.</summary>
/// <param name="message">Message to process.</param>
/// <remarks>Overrides WM_PAINT, WM_ERASEBKGND.</remarks>
protected override void WndProc(ref Message m)
{
const int WM_PAINT = 0x000F;
const int WM_PRINTCLIENT = 0x0318;
const int WM_ERASEBKGND = 0x0014;
const int WM_MOUSEHOVER = 0x02A1;
const int WM_NOTIFY = 0x004E;
NMHDR nm1;
bool messageProcessed = false;
switch (m.Msg)
{
case 7: // WM_SETFOCUS
//try { base.WndProc(ref m); } // skip immediate parent to avoid focus problems
//catch{}
m.Result = IntPtr.Zero;
messageProcessed = true;
break;
// case (int)WindowsMessage.WM_REFLECT + (int)WindowsMessage.WM_NOTIFY:
case (0x0400 + 0x1c00 + WM_NOTIFY):
m.Result = IntPtr.Zero;
nm1 = (NMHDR) m.GetLParam(typeof (NMHDR));
switch (nm1.code)
{
case (int) ListViewNotificationCodes.LVN_ITEMCHANGED:
messageProcessed = true;
break;
case (int) ListViewNotificationCodes.LVN_GETDISPINFOW:
OnDispInfoNotice(ref m, false);
messageProcessed = true;
break;
// ignore dragging as we are virtual and ListView doesnt like it.
case (int) ListViewNotificationCodes.LVN_BEGINDRAG:
OnBeginDrag(ref m);
messageProcessed = true;
break;
case (int) ListViewNotificationCodes.LVN_BEGINRDRAG:
OnBeginDrag(ref m);
messageProcessed = true;
break;
case (int) NotificationCodes.NM_CUSTOMDRAW:
m.Result = new IntPtr((int) OnCustomDraw(ref m));
messageProcessed = true;
break;
case (int) ListViewNotificationCodes.LVN_ODSTATECHANGED:
{
messageProcessed = true;
var lvod = (NMLVODSTATECHANGE) m.GetLParam(typeof (NMLVODSTATECHANGE));
int num1 = lvod.uOldState & (int) ListViewItemStates.LVIS_SELECTED;
int num2 = lvod.uNewState & (int) ListViewItemStates.LVIS_SELECTED;
if (num2 == num1)
return;
OnSelectedIndexChanged(EventArgs.Empty);
break;
}
default:
break;
}
break;
case WM_NOTIFY:
nm1 = (NMHDR) m.GetLParam(typeof (NMHDR));
if (nm1.code == (int) NotificationCodes.NM_RCLICK)
{
IntPtr header = SendMessage(Handle, (int) ListViewMessages.LVM_GETHEADER, IntPtr.Zero,
IntPtr.Zero);
uint curpos = GetMessagePos();
Point ptheader = PointToClient(new Point((short) curpos, (int) curpos >> 16));
var hdhti = new HDHITTESTINFO();
hdhti.pt = ptheader;
SendMessage(header, HeaderMessageCodes.HDM_HITTEST, IntPtr.Zero, ref hdhti);
OnColumnRightClick(new ColumnClickEventArgs(hdhti.iItem));
}
else if (nm1.code == (int) HeaderNotificationCodes.HDN_ITEMCLICKW)
{
if (OnCustomSort(ref m))
{
m.Result = IntPtr.Zero;
messageProcessed = true;
}
}
break;
case WM_ERASEBKGND:
//removes flicker
return;
case WM_MOUSEHOVER:
messageProcessed = true;
break;
case WM_PAINT:
// The designer host does not call OnResize()
if (internalGraphics == null)
OnResize(EventArgs.Empty);
//Set up
var updateRect = new RECT();
if (GetUpdateRect(m.HWnd, ref updateRect, false) == 0)
break;
var paintStruct = new PAINTSTRUCT();
IntPtr screenHdc = BeginPaint(m.HWnd, ref paintStruct);
using (Graphics screenGraphics = Graphics.FromHdc(screenHdc))
{
//Draw Internal Graphics
internalGraphics.Clear(BackColor);
IntPtr hdc = internalGraphics.GetHdc();
Message printClientMessage = Message.Create(Handle, WM_PRINTCLIENT, hdc, IntPtr.Zero);
DefWndProc(ref printClientMessage);
internalGraphics.ReleaseHdc(hdc);
//Add the missing OnPaint() call
OnPaint(new PaintEventArgs(internalGraphics, Rectangle.FromLTRB(
updateRect.left,
updateRect.top,
updateRect.right,
updateRect.bottom)));
//Draw Screen Graphics
screenGraphics.DrawImage(internalBitmap, 0, 0);
}
//Tear down
EndPaint(m.HWnd, ref paintStruct);
return;
default:
break;
}
if (!messageProcessed)
{
try
{
base.WndProc(ref m);
}
catch
{
}
}
}
private static extern int SendMessage(IntPtr hWnd, HeaderMessageCodes uMsg, IntPtr wParam,
ref HDHITTESTINFO lParam);