/* Returns TRUE if a translation should be done */
static gboolean
gtk_widget_get_translation_to_window (GtkWidget *widget,
GdkWindow *window,
int *x,
int *y)
{
GdkWindow *w, *widget_window;
if (! gtk_widget_get_has_window (widget))
{
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
*x = -allocation.x;
*y = -allocation.y;
}
else
{
*x = 0;
*y = 0;
}
widget_window = gtk_widget_get_window (widget);
for (w = window;
w && w != widget_window;
w = gdk_window_get_effective_parent (w))
{
gdouble px, py;
gdk_window_coords_to_parent (w, *x, *y, &px, &py);
*x += px;
*y += py;
}
if (w == NULL)
{
*x = 0;
*y = 0;
return FALSE;
}
return TRUE;
}
/* Translates coordinates from window relative (x, y) to
* allocation relative (x, y) of the returned widget.
*/
GtkWidget *
_gtk_widget_find_at_coords (GdkWindow *window,
gint window_x,
gint window_y,
gint *widget_x,
gint *widget_y)
{
GtkWidget *event_widget;
struct ChildLocation child_loc = { NULL, NULL, 0, 0 };
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
gdk_window_get_user_data (window, (void **)&event_widget);
if (!event_widget)
return NULL;
#ifdef DEBUG_TOOLTIP
g_print ("event window %p (belonging to %p (%s)) (%d, %d)\n",
window, event_widget, gtk_widget_get_name (event_widget),
window_x, window_y);
#endif
/* Coordinates are relative to event window */
child_loc.x = window_x;
child_loc.y = window_y;
/* We go down the window hierarchy to the widget->window,
* coordinates stay relative to the current window.
* We end up with window == widget->window, coordinates relative to that.
*/
while (window && window != gtk_widget_get_window (event_widget))
{
gdouble px, py;
gdk_window_coords_to_parent (window,
child_loc.x, child_loc.y,
&px, &py);
child_loc.x = px;
child_loc.y = py;
window = gdk_window_get_effective_parent (window);
}
/* Failing to find widget->window can happen for e.g. a detached handle box;
* chaining ::query-tooltip up to its parent probably makes little sense,
* and users better implement tooltips on handle_box->child.
* so we simply ignore the event for tooltips here.
*/
if (!window)
return NULL;
/* Convert the window relative coordinates to allocation
* relative coordinates.
*/
window_to_alloc (event_widget,
child_loc.x, child_loc.y,
&child_loc.x, &child_loc.y);
if (GTK_IS_CONTAINER (event_widget))
{
GtkWidget *container = event_widget;
child_loc.container = event_widget;
child_loc.child = NULL;
gtk_container_forall (GTK_CONTAINER (event_widget),
child_location_foreach, &child_loc);
/* Here we have a widget, with coordinates relative to
* child_loc.container's allocation.
*/
if (child_loc.child)
event_widget = child_loc.child;
else if (child_loc.container)
event_widget = child_loc.container;
/* Translate to event_widget's allocation */
gtk_widget_translate_coordinates (container, event_widget,
child_loc.x, child_loc.y,
&child_loc.x, &child_loc.y);
}
/* We return (x, y) relative to the allocation of event_widget. */
if (widget_x)
*widget_x = child_loc.x;
if (widget_y)
*widget_y = child_loc.y;
return event_widget;
}