[ericshliao]

It's so great! This approach works.
Now LED and buttons on iLiad can be used in QT4 apps.

I borrowed some code from trayicon_x11.cpp and made some modification.

This is the code that I use in djview4 for iLiad:

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <QX11Info>



  Display *dsp = QX11Info::display();
  WId leader   = winId();
  // set the class hint
  XClassHint classhint;
  classhint.res_name  = (char*)"sh";
  classhint.res_class = (char*)"sh";
  XSetClassHint(dsp, leader, &classhint);
  // set the Window Manager hints
  XWMHints *hints;
  hints = XGetWMHints(dsp, leader); // init hints
  hints->flags = WindowGroupHint | IconWindowHint | StateHint; // set the window group hint
  hints->window_group = leader;  // set the window hint
  hints->initial_state = WithdrawnState; // initial state
  //hints->icon_window = icon;  // in WM, this should be winId() of separate widget
  hints->icon_x = 0;
  hints->icon_y = 0;
  
  XSetWMHints(dsp, leader, hints); // set the window hints for WM to use.
  XFree( hints );
  //end setting WM hints