// this is the new wndproc, just show a messagebox on left button down:
private int MyWndProc(IntPtr hWnd, int Msg, int wParam, int lParam)
{
System.Diagnostics.Debug.WriteLine(Msg.ToString());
switch (Msg)
{
case 0x4e:
{
unsafe
{
NMHDR *hdr = (NMHDR *)lParam;
if (hdr->code == LVN_LINKCLICK)
{
MessageBox.Show("Link clicked!");
return(0);
}
}
break;
}
default:
break;
}
return(CallWindowProc(oldWndProc, hWnd, Msg, wParam, lParam));
}
protected unsafe override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 8270:
NMHDR *ptr = (NMHDR *)((void *)m.LParam);
if (ptr->code == NM_CUSTOMDRAW)
{
NMTVCUSTOMDRAW nMTVCUSTOMDRAW = (NMTVCUSTOMDRAW)m.GetLParam(typeof(NMTVCUSTOMDRAW));
int dwDrawStage = nMTVCUSTOMDRAW.nmcd.dwDrawStage;
if (dwDrawStage == (CDDS_ITEM | CDDS_PREPAINT))
{
TreeNode treeNode = TreeNode.FromHandle(this, nMTVCUSTOMDRAW.nmcd.dwItemSpec);
if (treeNode != null)
{
using (Graphics graphics = Graphics.FromHdcInternal(nMTVCUSTOMDRAW.nmcd.hdc))
{
var bounds = treeNode.Bounds;
using (var brush = new SolidBrush(GetNodeRowBackgroundColor(treeNode)))
{
graphics.FillRectangle(brush, new Rectangle(0, bounds.Top, this.Width, bounds.Height));
}
}
}
}
}
break;
case WM_ERASEBKGND:
// in this handler erase only part of background that is not covered by nodes
TreeNode lastVisible = FindLastVisible(Nodes);
Rectangle r;
if (lastVisible != null)
{
r = new Rectangle(0, lastVisible.Bounds.Bottom, Width, Height);
}
else
{
r = new Rectangle(0, 0, Width, Height);
}
using (var g = CreateGraphics())
g.FillRectangle(Brushes.White, r);
m.Result = (IntPtr)1;
return; // skip default processing
case WM_HSCROLL:
Invalidate();
break;
}
base.WndProc(ref m);
}
private unsafe void OnWmReflectNotify(ref Message m)
{
NMHDR *hdr = (NMHDR *)m.LParam;
if (OSVersion.IsAboveOrEqual(WindowsVersion.Vista) && hdr->code == LVN_LinkClick)
{
NMLVLINK link = (NMLVLINK)Marshal.PtrToStructure(m.LParam, typeof(NMLVLINK));
this.OnGroupLinkClicked(this.FindGroup(link.SubItemIndex));
}
else if (hdr->code == NM_DBLClk)
{
if (!_doubleClickChecks && this.CheckBoxes)
{
_doubleClickCheckHackActive = true;
}
}
}
public static unsafe void ReflectMessage(ref Message msg, out bool handled)
{
IntPtr hWndChild = IntPtr.Zero;
if (msg.MessageId == WindowMessages.WM_COMMAND)
{
if (msg.LParam != IntPtr.Zero)
{
hWndChild = msg.LParam;
}
}
else if (msg.MessageId == WindowMessages.WM_NOTIFY)
{
NMHDR *header = (NMHDR *)msg.LParam;
hWndChild = header->hWndFrom;
}
else if (msg.MessageId == WindowMessages.WM_PARENTNOTIFY)
{
uint submessage = (uint)((int)msg.WParam & 0xFFFF);
if (submessage == WindowMessages.WM_CREATE || submessage == WindowMessages.WM_DESTROY)
{
hWndChild = msg.LParam;
}
else
{
int controlId = ((int)msg.WParam >> 16) & 0xFFFF;
hWndChild = NativeMethods.GetDlgItem(msg.TargetHandle, controlId);
}
}
else if (msg.MessageId == WindowMessages.WM_DRAWITEM)
{
if (msg.WParam != IntPtr.Zero)
{
DRAWITEMSTRUCT *drawItemStruct = (DRAWITEMSTRUCT *)msg.WParam;
hWndChild = drawItemStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_MEASUREITEM)
{
if (msg.WParam != IntPtr.Zero)
{
MEASUREITEMSTRUCT *measureItemStruct = (MEASUREITEMSTRUCT *)msg.WParam;
hWndChild = NativeMethods.GetDlgItem(msg.TargetHandle, (int)measureItemStruct->CtlID);
}
}
else if (msg.MessageId == WindowMessages.WM_COMPAREITEM)
{
if (msg.WParam != IntPtr.Zero)
{
COMPAREITEMSTRUCT *compareStruct = (COMPAREITEMSTRUCT *)msg.WParam;
hWndChild = compareStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_DELETEITEM)
{
if (msg.WParam != IntPtr.Zero)
{
DELETEITEMSTRUCT *deleteStruct = (DELETEITEMSTRUCT *)msg.WParam;
hWndChild = deleteStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_VKEYTOITEM || msg.MessageId == WindowMessages.WM_CHARTOITEM ||
msg.MessageId == WindowMessages.WM_HSCROLL || msg.MessageId == WindowMessages.WM_VSCROLL)
{
hWndChild = msg.LParam;
}
else if (msg.MessageId == WindowMessages.WM_CTLCOLORBTN || msg.MessageId == WindowMessages.WM_CTLCOLORDLG ||
msg.MessageId == WindowMessages.WM_CTLCOLOREDIT || msg.MessageId == WindowMessages.WM_CTLCOLORMSGBOX ||
msg.MessageId == WindowMessages.WM_CTLCOLORMSGBOX || msg.MessageId == WindowMessages.WM_CTLCOLORSCROLLBAR ||
msg.MessageId == WindowMessages.WM_CTLCOLORSTATIC)
{
hWndChild = msg.LParam;
}
if (hWndChild == IntPtr.Zero)
{
handled = false;
return;
}
if (!NativeMethods.IsWindow(hWndChild))
{
throw new InvalidOperationException("hwndChild not a valid HWND");
}
// This code relies on the fact that NativeMethods.GetProp() returns IntPtr.Zero
// if the property has not been set. This code only cares if the handled flag
// was set to true. If the flag is false, this code behaves the same as if
// SetReflectedMessageHandled() was never called at all.
NativeMethods.RemoveProp(hWndChild, HandledProperty); // clear it out, just in case
IntPtr result = NativeMethods.SendMessage(hWndChild, msg.MessageId + WM_REFLECTED_MESSAGE_BASE, msg.WParam, msg.LParam);
handled = NativeMethods.GetProp(hWndChild, HandledProperty) != IntPtr.Zero;
NativeMethods.RemoveProp(hWndChild, HandledProperty);
if (handled)
{
msg.Result = result;
}
}
afx_msg void OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult);
