gdkasync.c

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  ListChildrenState *state = (ListChildrenState *)data;

  if (dpy->last_request_read != state->get_property_req)
    return False;
  
  if (rep->generic.type == X_Error)
    {
      state->have_error = TRUE;
      return False;
    }
  else
    {
      xGetPropertyReply replbuf;
      xGetPropertyReply *repl;
	    
      repl = (xGetPropertyReply *)
	_XGetAsyncReply(dpy, (char *)&replbuf, rep, buf, len,
			(sizeof(xGetPropertyReply) - sizeof(xReply)) >> 2,
			True);

      state->has_wm_state = repl->propertyType != None;
      /* Since we called GetProperty with longLength of 0, we don't
       * have to worry about consuming the property data that would
       * normally follow after the reply
       */

      return True;
    }
}

static gboolean
list_children_and_wm_state (Display      *dpy,
			    Window        w,
			    Atom          wm_state_atom,
			    gboolean     *has_wm_state,
			    Window      **children,
			    unsigned int *nchildren)
{
  ListChildrenState state;
  _XAsyncHandler async;
  long nbytes;
  xQueryTreeReply rep;
  register xResourceReq *req;
  xGetPropertyReq *prop_req;

  LockDisplay(dpy);

  *children = NULL;
  *nchildren = 0;
  *has_wm_state = FALSE;
  
  state.have_error = FALSE;
  state.has_wm_state = FALSE;

  if (wm_state_atom)
    {
      async.next = dpy->async_handlers;
      async.handler = list_children_handler;
      async.data = (XPointer) &state;
      dpy->async_handlers = &async;

      GetReq (GetProperty, prop_req);
      prop_req->window = w;
      prop_req->property = wm_state_atom;
      prop_req->type = AnyPropertyType;
      prop_req->delete = False;
      prop_req->longOffset = 0;
      prop_req->longLength = 0;
      
      state.get_property_req = dpy->request;
    }
  
  GetResReq(QueryTree, w, req);
  if (!_XReply(dpy, (xReply *)&rep, 0, xFalse))
    {
      state.have_error = TRUE;
      goto out;
    }

  if (rep.nChildren != 0)
    {
      nbytes = rep.nChildren << 2;
      if (state.have_error)
	{
	  _XEatData(dpy, (unsigned long) nbytes);
	  goto out;
	}
      *children = g_new (Window, rep.nChildren);
      _XRead32 (dpy, (long *) *children, nbytes);
    }

  *nchildren = rep.nChildren;
  *has_wm_state = state.has_wm_state;

 out:
  if (wm_state_atom)
    DeqAsyncHandler(dpy, &async);
  UnlockDisplay(dpy);
  SyncHandle();
  
  return !state.have_error;
}

static void
handle_get_wa_reply (Display                   *dpy,
		     ChildInfoState            *state,
		     xGetWindowAttributesReply *repl)
{
  GdkChildInfoX11 *child = &state->child_info[state->n_children_found];
  child->is_mapped = repl->mapState != IsUnmapped;
  child->window_class = repl->class;
}

static void
handle_get_geometry_reply (Display           *dpy,
			   ChildInfoState    *state,
			   xGetGeometryReply *repl)
{
  GdkChildInfoX11 *child = &state->child_info[state->n_children_found];
  
  child->x = cvtINT16toInt (repl->x);
  child->y = cvtINT16toInt (repl->y);
  child->width = repl->width;
  child->height = repl->height;
}

static void
handle_get_property_reply (Display           *dpy,
			   ChildInfoState    *state,
			   xGetPropertyReply *repl)
{
  GdkChildInfoX11 *child = &state->child_info[state->n_children_found];
  child->has_wm_state = repl->propertyType != None;

  /* Since we called GetProperty with longLength of 0, we don't
   * have to worry about consuming the property data that would
   * normally follow after the reply
   */
}

static void
next_child (ChildInfoState *state)
{
  if (state->current_request == CHILD_INFO_GET_GEOMETRY)
    {
      if (!state->have_error && !state->child_has_error)
	{
	  state->child_info[state->n_children_found].window = state->children[state->current_child];
	  state->n_children_found++;
	}
      state->current_child++;
      if (state->get_wm_state)
	state->current_request = CHILD_INFO_GET_PROPERTY;
      else
	state->current_request = CHILD_INFO_GET_WA;
      state->child_has_error = FALSE;
      state->have_error = FALSE;
    }
  else
    state->current_request++;
}

static Bool
get_child_info_handler (Display *dpy,
			xReply  *rep,
			char    *buf,
			int      len,
			XPointer data)
{
  Bool result = True;
  
  ChildInfoState *state = (ChildInfoState *)data;

  if (dpy->last_request_read != state->child_states[state->current_child].seq[state->current_request])
    return False;
  
  if (rep->generic.type == X_Error)
    {
      state->child_has_error = TRUE;
      if (rep->error.errorCode != BadDrawable ||
	  rep->error.errorCode != BadWindow)
	{
	  state->have_error = TRUE;
	  result = False;
	}
    }
  else
    {
      switch (state->current_request)
	{
	case CHILD_INFO_GET_PROPERTY:
	  {
	    xGetPropertyReply replbuf;
	    xGetPropertyReply *repl;
	    
	    repl = (xGetPropertyReply *)
	      _XGetAsyncReply(dpy, (char *)&replbuf, rep, buf, len,
			      (sizeof(xGetPropertyReply) - sizeof(xReply)) >> 2,
			      True);
	    
	    handle_get_property_reply (dpy, state, repl);
	  }
	  break;
	case CHILD_INFO_GET_WA:
	  {
	    xGetWindowAttributesReply replbuf;
	    xGetWindowAttributesReply *repl;
	    
	    repl = (xGetWindowAttributesReply *)
	      _XGetAsyncReply(dpy, (char *)&replbuf, rep, buf, len,
			      (sizeof(xGetWindowAttributesReply) - sizeof(xReply)) >> 2,
			      True);
	    
	    handle_get_wa_reply (dpy, state, repl);
	  }
	  break;
	case CHILD_INFO_GET_GEOMETRY:
	  {
	    xGetGeometryReply replbuf;
	    xGetGeometryReply *repl;
	    
	    repl = (xGetGeometryReply *)
	      _XGetAsyncReply(dpy, (char *)&replbuf, rep, buf, len,
			      (sizeof(xGetGeometryReply) - sizeof(xReply)) >> 2,
			      True);
	    
	    handle_get_geometry_reply (dpy, state, repl);
	  }
	  break;
	}
    }

  next_child (state);

  return result;
}

gboolean
_gdk_x11_get_window_child_info (GdkDisplay       *display,
				Window            window,
				gboolean          get_wm_state,
				gboolean         *win_has_wm_state,
				GdkChildInfoX11 **children,
				guint            *nchildren)
{
  Display *dpy;
  _XAsyncHandler async;
  ChildInfoState state;
  Atom wm_state_atom;
  gboolean has_wm_state;
  Bool result;
  guint i;

  *children = NULL;
  *nchildren = 0;
  
  dpy = GDK_DISPLAY_XDISPLAY (display);
  if (get_wm_state)
    wm_state_atom = gdk_x11_get_xatom_by_name_for_display (display, "WM_STATE");
  else
    wm_state_atom = None;

  gdk_error_trap_push ();
  result = list_children_and_wm_state (dpy, window,
				       win_has_wm_state ? wm_state_atom : None,
				       &has_wm_state,
				       &state.children, &state.nchildren);
  gdk_error_trap_pop ();
  if (!result)
    return FALSE;

  if (has_wm_state)
    {
      if (win_has_wm_state)
	*win_has_wm_state = TRUE;
      return TRUE;
    }
  else
    {
      if (win_has_wm_state)
	*win_has_wm_state = FALSE;
    }

  state.get_wm_state = get_wm_state;
  state.child_info = g_new (GdkChildInfoX11, state.nchildren);
  state.child_states = g_new (ChildInfoChildState, state.nchildren);
  state.current_child = 0;
  state.n_children_found = 0;
  if (get_wm_state)
    state.current_request = CHILD_INFO_GET_PROPERTY;
  else
    state.current_request = CHILD_INFO_GET_WA;
  state.have_error = FALSE;
  state.child_has_error = FALSE;

  LockDisplay(dpy);

  async.next = dpy->async_handlers;
  async.handler = get_child_info_handler;
  async.data = (XPointer) &state;
  dpy->async_handlers = &async;
  
  for (i = 0; i < state.nchildren; i++)
    {
      xResourceReq *resource_req;
      xGetPropertyReq *prop_req;
      Window window = state.children[i];
      
      if (get_wm_state)
	{
	  GetReq (GetProperty, prop_req);
	  prop_req->window = window;
	  prop_req->property = wm_state_atom;
	  prop_req->type = AnyPropertyType;
	  prop_req->delete = False;
	  prop_req->longOffset = 0;
	  prop_req->longLength = 0;

	  state.child_states[i].seq[CHILD_INFO_GET_PROPERTY] = dpy->request;
	}
      
      GetResReq(GetWindowAttributes, window, resource_req);
      state.child_states[i].seq[CHILD_INFO_GET_WA] = dpy->request;
      
      GetResReq(GetGeometry, window, resource_req);
      state.child_states[i].seq[CHILD_INFO_GET_GEOMETRY] = dpy->request;
    }

  if (i != 0)
    {
      /* Wait for the last reply
       */
      xGetGeometryReply rep;

      /* On error, our async handler will get called
       */
      if (_XReply (dpy, (xReply *)&rep, 0, xTrue))
	handle_get_geometry_reply (dpy, &state, &rep);

      next_child (&state);
    }

  if (!state.have_error)
    {
      *children = state.child_info;
      *nchildren = state.n_children_found;
    }
  else
    {
      g_free (state.child_info);
    }

  g_free (state.children);
  g_free (state.child_states);
  
  DeqAsyncHandler(dpy, &async);
  UnlockDisplay(dpy);
  SyncHandle();

  return !state.have_error;
}

#define __GDK_ASYNC_C__
#include "gdkaliasdef.c"