🚀 go-pugleaf

Gary Setter wrote:
> I don't understand. Why don't you think that GWL_WNDPROC existis?

I'm just now checking that for a window control that was not created
with my window class (like tEdit) my code cannot work as intended.

> I was able to get you app running. I posted some of your code below.

The code as posted works just fine.

> Here is some of the code that I changed. The key is using the  GWL_USERDATA
> offset, which is available for all windows including EDIT.

Moving from GWL_WNDPROC to GWL_USERDATA helped. Now I can work with a
non-static tEdit::WndProc, that means the code from EditWindowProc can
be moved to tEdit::WndProc. The resulting functions after changings look
as following:

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam,
                         LPARAM lParam) {
  tWindow* pWindow = reinterpret_cast<tWindow*>
                       (GetWindowLong(hWnd, GWL_USERDATA));
  if (!pWindow) 
    return DefWindowProc(hWnd, iMessage, wParam, lParam);
  return pWindow->WndProc(iMessage, wParam, lParam);
}

void tWindow :: Create() {
  hWnd = CreateWindow(szWndClsName, title.c_str(), attr.style,
                      attr.left, attr.top, attr.width, attr.height,
                      parent ? parent->GetHandle() : 0, 0,
                      tApp::hInst, 0);
  if (!hWnd)
    throw tXWindow();
  hDC = GetDC(hWnd);
  if (!hDC)
    throw tXWindow();
  SetWindowLong(hWnd, GWL_USERDATA, (LONG)this);
  if (parent)
    parent->AddChild(this);
}

void tEdit :: Create() {
  attr.style |= ES_AUTOHSCROLL | ES_LEFT | WS_TABSTOP;
  hWnd = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "", attr.style,
                        attr.left, attr.top, attr.width, attr.height,
                        parent ? parent->GetHandle() : 0, 0,
                        tApp::hInst, 0);
  if (!hWnd)
    throw tXWindow();
  orgWndProc = (WNDPROC)SetWindowLong(hWnd, GWL_WNDPROC,
(LONG)::WndProc);
  if (!orgWndProc)
    throw tXWindow();
  if (parent)
    parent->AddChild(this);
}

Do you see any problems with this? As far as I can tell the app is
running.
Thanks for help.

Martin