<!-- ##### SECTION Title ##### -->GtkTreeModelFilter<!-- ##### SECTION Short_Description ##### -->A GtkTreeModel which hides parts of an underlying tree model<!-- ##### SECTION Long_Description ##### --><para>A #GtkTreeModelFilter is a tree model which wraps another tree model,and can do the following things:<itemizedlist><listitem><para>Filter specific rows, based on data from a "visible column", a columnstoring booleans indicating whether the row should be filtered or not,or based on the return value of a "visible function", which gets amodel, iter and user_data and returns a boolean indicating whether therow should be filtered or not.</para></listitem><listitem><para>Modify the "appearance" of the model, using a modify function. This is extremely powerful and allows for just changingsome values and also for creating a completely different model based onthe given child model. </para></listitem><listitem><para>Set a different root node, also known as a "virtual root". You can pass in a #GtkTreePath indicating the root node for the filter at construction time.</para></listitem></itemizedlist></para><!-- ##### SECTION See_Also ##### --><para>#GtkTreeModelSort</para><!-- ##### SECTION Stability_Level ##### --><!-- ##### STRUCT GtkTreeModelFilter ##### --><para>The GtkTreeModelFilter struct contains only private fields.</para><!-- ##### ARG GtkTreeModelFilter:child-model ##### --><para></para><!-- ##### ARG GtkTreeModelFilter:virtual-root ##### --><para></para><!-- ##### USER_FUNCTION GtkTreeModelFilterVisibleFunc ##### --><para>A function which decides whether the row indicated by @iter is visible.</para>@model: the child model of the #GtkTreeModelFilter@iter: a #GtkTreeIter pointing to the row in @model whose visibility    is determined@data: user data given to gtk_tree_model_filter_set_visible_func()@Returns: Whether the row indicated by @iter is visible.<!-- ##### USER_FUNCTION GtkTreeModelFilterModifyFunc ##### --><para>A function which calculates display values from raw values in the model.It must fill @value with the display value for the column @column in the row indicated by @iter. </para><para>Since this function is called for each data access, it's not aparticularly efficient operation.</para>@model: the #GtkTreeModelFilter@iter: a #GtkTreeIter pointing to the row whose display values are determined@value: A #GValue which is already initialized for with the correct type for   the column @column.@column: the column whose display value is determined@data: user data given to gtk_tree_model_filter_set_modify_func()<!-- ##### FUNCTION gtk_tree_model_filter_new ##### --><para></para>@child_model: @root: @Returns: <!-- ##### FUNCTION gtk_tree_model_filter_set_visible_func ##### --><para></para>@filter: @func: @data: @destroy: <!-- ##### FUNCTION gtk_tree_model_filter_set_modify_func ##### --><para></para>@filter: @n_columns: @types: @func: @data: @destroy: <!-- ##### FUNCTION gtk_tree_model_filter_set_visible_column ##### --><para></para>@filter: @column: <!-- ##### FUNCTION gtk_tree_model_filter_get_model ##### --><para></para>@filter: @Returns: <!-- ##### FUNCTION gtk_tree_model_filter_convert_child_iter_to_iter ##### --><para></para>@filter: @filter_iter: @child_iter: <!-- ##### FUNCTION gtk_tree_model_filter_convert_iter_to_child_iter ##### --><para></para>@filter: @child_iter: @filter_iter: <!-- ##### FUNCTION gtk_tree_model_filter_convert_child_path_to_path ##### --><para></para>@filter: @child_path: @Returns: <!-- ##### FUNCTION gtk_tree_model_filter_convert_path_to_child_path ##### --><para></para>@filter: @filter_path: @Returns: <!-- # Unused Parameters # -->@path: <!-- ##### FUNCTION gtk_tree_model_filter_refilter ##### --><para></para>@filter: <!-- ##### FUNCTION gtk_tree_model_filter_clear_cache ##### --><para></para>@filter: