the #GdkWindow @rect is relative to
the #GdkRectangle to align @menu with
the point on @rect to align with @menu's anchor point
the point on @menu to align with @rect's anchor point
the #GdkEvent that initiated this request or %NULL if it's the current event
3.22
Displays @menu and makes it available for selection.
See gtk_menu_popup_at_widget () and gtk_menu_popup_at_pointer (), which handle more common cases for popping up menus.
@menu will be positioned at @rect, aligning their anchor points. @rect is relative to the top-left corner of @rect_window. @rect_anchor and @menu_anchor determine anchor points on @rect and @menu to pin together. @menu can optionally be offset by #GtkMenu:rect-anchor-dx and #GtkMenu:rect-anchor-dy.
Anchors should be specified under the assumption that the text direction is left-to-right; they will be flipped horizontally automatically if the text direction is right-to-left.
Other properties that influence the behaviour of this function are #GtkMenu:anchor-hints and #GtkMenu:menu-type-hint. Connect to the #GtkMenu::popped-up signal to find out how it was actually positioned.