fltk_indicator.cpp

class tray_window : public Fl_Double_Window
{
public:
  tray_window(int W, int H, const char *L=0)
    : Fl_Double_Window(W, H, L) { }

  int handle(int event) {
    int rv = Fl_Double_Window::handle(event);
    switch (event) {
      case FL_PUSH:
    //case FL_RELEASE:
        do_callback();
        rv = 1;
        break;
    }
    return rv;
  }
};

static tray_window *win;
static const char *command = NULL;

static void callback(Fl_Widget *, void *);
static void close_cb(Fl_Widget *, void *);

static Fl_Menu_Item menu[] = {
  { "Launch", 0, callback, 0,0, FL_NORMAL_LABEL, 0, 14, 0 },
  { "Quit",   0, close_cb, 0,0, FL_NORMAL_LABEL, 0, 14, 0 },
  { 0,0,0,0,0,0,0,0,0 }
};

static void callback(Fl_Widget *, void *) {
  win->hide();
  execl("/bin/sh", "sh", "-c", command, NULL);
  _exit(127);
}

static void show_menu_cb(Fl_Widget *) {
  menu->popup(1,1);
}

static void close_cb(Fl_Widget *, void *) {
  win->hide();
}

static bool create_tray_entry(const char *)
{
  Window dock;
  XColor c;
  XImage *image;
  XEvent ev;
  char atom_tray_name[128];
  char buf[16];

  snprintf(atom_tray_name, sizeof(atom_tray_name), "_NET_SYSTEM_TRAY_S%i", fl_screen);
  dock = XGetSelectionOwner(fl_display, XInternAtom(fl_display, atom_tray_name, False));
  if (!dock) {
    return false;
  }

  win = new tray_window(32, 32);
  {
    Fl_Box *o = new Fl_Box(0, 0, 32, 32);
    o->type(FL_NO_BOX);
    o->image(new Fl_PNG_Image(NULL, src_default_tray_icon_png, src_default_tray_icon_png_len));
  }
  win->callback(callback);
  //win->callback(show_menu_cb);
  win->clear_border();
  win->end();
  win->show();

  memset(&ev, 0, sizeof(ev));
  ev.xclient.type = ClientMessage;
  ev.xclient.window = dock;
  ev.xclient.message_type = XInternAtom(fl_display, "_NET_SYSTEM_TRAY_OPCODE", False);
  ev.xclient.format = 32;
  ev.xclient.data.l[0] = fl_event_time;
  ev.xclient.data.l[1] = 0;  // SYSTEM_TRAY_REQUEST_DOCK
  ev.xclient.data.l[2] = fl_xid(win);
  ev.xclient.data.l[3] = 0;
  ev.xclient.data.l[4] = 0;
  XSendEvent(fl_display, dock, False, NoEventMask, &ev);
  XSync(fl_display, False);
  //trap_errors();

  image = XGetImage(fl_display, RootWindow(fl_display, DefaultScreen(fl_display)),
                    win->x() + 1, win->y() + 1, 1, 1, AllPlanes, XYPixmap);
  c.pixel = XGetPixel(image, 0, 0);
  XFree(image);

  XQueryColor(fl_display, DefaultColormap(fl_display, DefaultScreen(fl_display)), &c);
  snprintf(buf, sizeof(buf), "0x%02x%02x%02x00",
           static_cast<int>(c.red >> 8),
           static_cast<int>(c.green >> 8),
           static_cast<int>(c.blue >> 8));
  win->color(strtoul(buf, 0, 16));
  win->redraw();
  //if (untrap_errors()) {
  /* Handle failure */
  //}

  return true;
}