Create small win32 window which is both draggable and clickable

Question

Created a small window

    HWND hWnd = CreateWindowW(szWindowClass, NULL, WS_POPUP | WS_BORDER,
        1200, 800, 60, 60,
        nullptr, nullptr, hInstance, nullptr);

Dragging window is working when the following code is added in window procedure,

      case WM_NCHITTEST:
      return HTCAPTION;
      break;

But unfortunately dragging stopped working after i added a button in the window. I need to capture click event so added a button. Click event is working, i.e., i get the message box when i click.

case WM_COMMAND:
{
        MessageBoxW(NULL, L"WM_COMMAND", L"msgbox", MB_OK);
}
break;
case WM_CREATE:
{
        hButton = CreateWindow(L"BUTTON", NULL,
            WS_CHILD | WS_VISIBLE, 0, 0, 60, 60, hWnd, 0, NULL, NULL);
}
break;

I like to have both dragging and clicking to work.

Answer 1

Implement the additional code described in the answer here - how-do-i-implement-dragging-a-window-using-its-client-area. If your button takes the entire client area of the parent window then you need to drag the window by using its border. So test for both HTCLIENT and HTBORDER.