Gtk.TreeView.prototype.set_tooltip_column

function set_tooltip_column(column:Number):void {
    // Gjs wrapper for gtk_tree_view_set_tooltip_column()
}

If you only plan to have simple (text-only) tooltips on full rows, you can use this function to have Gtk.TreeView handle these automatically for you. column should be set to the column in tree_view's model containing the tooltip texts, or -1 to disable this feature.

When enabled, Gtk.has-tooltip will be set to true and tree_view will connect a Gtk.query-tooltip signal handler.

Note that the signal handler sets the text with Gtk.Tooltip.prototype.set_markup, so &, <, etc have to be escaped in the text.

Since 2.12