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# Gtk::TreeModelFilter Class Reference
[TreeView Classes]

Inheritance diagram for Gtk::TreeModelFilter:

[legend]
List of all members.

## Public Types
typedef sigc::slot< void, const Gtk::TreeModel::iterator&, Glib::ValueBase&, int > | SlotModify
| For instance, void on_modify(const Gtk::TreeModel::iterator& iter, Glib::ValueBase& value, int column);.
typedef sigc::slot< bool, const TreeModel::const_iterator& > | SlotVisible
| For instance, bool on_visible(const TreeModel::const_iterator& iter); This should return true if the given row should be visible and false otherwise.
## Public Member Functions
void | clear_cache ()
| This function should almost never be called.
iterator | convert_child_iter_to_iter (const iterator& child_iter) const
| Gets an iterator that points to the sorted row that corresponds to the child row pointed at by child_iter.
Path | convert_child_path_to_path (const Path& child_path) const
| Converts child_path to a path relative to filter .
Path | convert_child_path_to_path (const Path& child_path)
| Converts child_path to a path relative to filter .
iterator | convert_iter_to_child_iter (const iterator& filter_iter) const
| Gets an iterator that points to the child row that corresponds to the sorted row pointed at by sorted_iter.
Path | convert_path_to_child_path (const Path& filter_path) const
| Converts filter_path to a path on the child model of filter .
Path | convert_path_to_child_path (const Path& filter_path)
| Converts filter_path to a path on the child model of filter .
Glib::RefPtr<const TreeModel> | get_model () const
| Return value: A pointer to a Gtk::TreeModel.
Glib::RefPtr<TreeModel> | get_model ()
| Return value: A pointer to a Gtk::TreeModel.
const GtkTreeModelFilter* | gobj () const
| Provides access to the underlying C GObject.
GtkTreeModelFilter* | gobj ()
| Provides access to the underlying C GObject.
GtkTreeModelFilter* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
void | refilter ()
| Emits row_changed for each row in the child model, which causes the filter to re-evaluate whether a row is visible or not.
void | set_modify_func (const TreeModelColumnRecord& columns, const SlotModify& slot)
| Specify columns that will be provided by this model, and a callback that will provide data for these columns based on data in the columns of the child model.
void | set_visible_column (int column)
| Sets column of the child_model to be the column where filter should look for visibility information.
void | set_visible_column (const TreeModelColumnBase& column)
| Sets column of the child_model to be the column where filter should look for visibility information.
void | set_visible_func (const SlotVisible& slot)
| Sets the "visible" callback used when filtering the filter.
virtual | ~TreeModelFilter ()
## Static Public Member Functions
static Glib::RefPtr<TreeModelFilter> | create (const Glib::RefPtr<TreeModel>& child_model, const TreeModel::Path& virtual_root)
| This creates a TreeModelFilter with child_model as the child model, and root as the virtual root.
static Glib::RefPtr<TreeModelFilter> | create (const Glib::RefPtr<TreeModel>& child_model)
| This creates a TreeModelFilter with child_model as the child model.
## Protected Member Functions
virtual void | set_value_impl (const iterator& row, int column, const Glib::ValueBase& value)
| Override and implement this in a derived TreeModel class, so that Row::operator() and Row::set_value() work.
| TreeModelFilter (const Glib::RefPtr<TreeModel>& child_model, const TreeModel::Path& virtual_root)
| TreeModelFilter (const Glib::RefPtr<TreeModel>& child_model)
## Related Functions
(Note that these are not member functions.)
Glib::RefPtr<Gtk::TreeModelFilter> | wrap (GtkTreeModelFilter* object, bool take_copy=false)
| A Glib::wrap() method for this object.

## Member Typedef Documentation

typedef sigc::slot<void, const Gtk::TreeModel::iterator& , Glib::ValueBase& , int > Gtk::TreeModelFilter::SlotModify

For instance, void on_modify(const Gtk::TreeModel::iterator& iter, Glib::ValueBase& value, int column);.

where iter is an iterator to a row in the child model, value is an output parameter in which you must store the value to be used in the parent model's row, column is the column in the parent row whose row value you must provide in the value output paramater.

typedef sigc::slot<bool, const TreeModel::const_iterator&> Gtk::TreeModelFilter::SlotVisible

For instance, bool on_visible(const TreeModel::const_iterator& iter); This should return true if the given row should be visible and false otherwise.

## Constructor & Destructor Documentation

virtual Gtk::TreeModelFilter::~TreeModelFilter | ( |  | ) | `[virtual]`

Gtk::TreeModelFilter::TreeModelFilter | ( | const Glib::RefPtr<TreeModel>& | child_model | ) | `[explicit, protected]`

Gtk::TreeModelFilter::TreeModelFilter | ( | const Glib::RefPtr<TreeModel>& | child_model,
|  | const TreeModel::Path& | virtual_root |
| ) |  |  | `[explicit, protected]`

## Member Function Documentation

void Gtk::TreeModelFilter::clear_cache | ( |  | ) |

This function should almost never be called.

It clears the filter of any cached iterators that haven't been reffed with ref_node(). This might be useful if the child model being filtered is static (and doesn't change often) and there has been a lot of unreffed access to nodes. As a side effect of this function, all unreffed iters will be invalid.

Since gtkmm 2.4:

iterator Gtk::TreeModelFilter::convert_child_iter_to_iter | ( | const iterator& | child_iter | ) | const

Gets an iterator that points to the sorted row that corresponds to the child row pointed at by child_iter.

Parameters:

  | child_iter | A valid iterator pointing to a row on the child model.

Returns:
  A valid iterator that points to the row in this sorted model.

Path Gtk::TreeModelFilter::convert_child_path_to_path | ( | const Path& | child_path | ) | const

Converts child_path to a path relative to filter .

That is, child_path points to a path in the child model. The rerturned path will point to the same row in the filtered model. If child_path isn't a valid path on the child model or points to a row which is not visible in filter , then `0` is returned.

Parameters:

  | child_path | A Gtk::TreePath to convert.

Returns:
  A newly allocated Gtk::TreePath, or `0`.

Since gtkmm 2.4:

Path Gtk::TreeModelFilter::convert_child_path_to_path | ( | const Path& | child_path | ) |

Converts child_path to a path relative to filter .

That is, child_path points to a path in the child model. The rerturned path will point to the same row in the filtered model. If child_path isn't a valid path on the child model or points to a row which is not visible in filter , then `0` is returned.

Deprecated:
  Use convert_child_path_to_path(const Path& child_path) const

Parameters:

  | child_path | A Gtk::TreePath to convert.

Returns:
  A newly allocated Gtk::TreePath, or `0`.

Since gtkmm 2.4:

iterator Gtk::TreeModelFilter::convert_iter_to_child_iter | ( | const iterator& | filter_iter | ) | const

Gets an iterator that points to the child row that corresponds to the sorted row pointed at by sorted_iter.

Parameters:

  | filter_iter | A valid iterator pointing to a row on the sorted model.

Returns:
  A valid iterator that points to the row in the child model.

Path Gtk::TreeModelFilter::convert_path_to_child_path | ( | const Path& | filter_path | ) | const

Converts filter_path to a path on the child model of filter .

That is, filter_path points to a location in filter . The returned path will point to the same location in the model not being filtered. If filter_path does not point to a location in the child model, `0` is returned.

Parameters:

  | filter_path | A Gtk::TreePath to convert.

Returns:
  A newly allocated Gtk::TreePath, or `0`.

Since gtkmm 2.4:

Path Gtk::TreeModelFilter::convert_path_to_child_path | ( | const Path& | filter_path | ) |

Converts filter_path to a path on the child model of filter .

That is, filter_path points to a location in filter . The returned path will point to the same location in the model not being filtered. If filter_path does not point to a location in the child model, `0` is returned.

Deprecated:
  convert_path_to_child_path(const Path& filter_path) const

Parameters:

  | filter_path | A Gtk::TreePath to convert.

Returns:
  A newly allocated Gtk::TreePath, or `0`.

Since gtkmm 2.4:

static Glib::RefPtr<TreeModelFilter> Gtk::TreeModelFilter::create | ( | const Glib::RefPtr<TreeModel>& | child_model,
|  | const TreeModel::Path& | virtual_root |
| ) |  |  | `[static]`

This creates a TreeModelFilter with child_model as the child model, and root as the virtual root.

You can use set_visible_func(), set_visible_column() and/or set_modify_func() to change the mapping of child model to parent model.

static Glib::RefPtr<TreeModelFilter> Gtk::TreeModelFilter::create | ( | const Glib::RefPtr<TreeModel>& | child_model | ) | `[static]`

This creates a TreeModelFilter with child_model as the child model.

You can use set_visible_func(), set_visible_column() and/or set_modify_func() to change the mapping of child model to parent model.

Glib::RefPtr<const TreeModel> Gtk::TreeModelFilter::get_model | ( |  | ) | const

Return value: A pointer to a Gtk::TreeModel.

Returns:
  A pointer to a Gtk::TreeModel.

Since gtkmm 2.4:

Glib::RefPtr<TreeModel> Gtk::TreeModelFilter::get_model | ( |  | ) |

Return value: A pointer to a Gtk::TreeModel.

Returns:
  A pointer to a Gtk::TreeModel.

Since gtkmm 2.4:

const GtkTreeModelFilter* Gtk::TreeModelFilter::gobj | ( |  | ) | const`[inline]`

Provides access to the underlying C GObject.

Reimplemented from Gtk::TreeModel.

GtkTreeModelFilter* Gtk::TreeModelFilter::gobj | ( |  | ) | `[inline]`

Provides access to the underlying C GObject.

Reimplemented from Gtk::TreeModel.

GtkTreeModelFilter* Gtk::TreeModelFilter::gobj_copy | ( |  | ) |

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

void Gtk::TreeModelFilter::refilter | ( |  | ) |

Emits row_changed for each row in the child model, which causes the filter to re-evaluate whether a row is visible or not.

Since gtkmm 2.4:

void Gtk::TreeModelFilter::set_modify_func | ( | const TreeModelColumnRecord& | columns,
|  | const SlotModify& | slot |
| ) |  |  |

Specify columns that will be provided by this model, and a callback that will provide data for these columns based on data in the columns of the child model.

The modify function will get called for each data access.

Parameters:

  | columns | Column types for this model (which will be exposed to the parent model/view).
  | slot | A callback which will be called for each data access.

virtual void Gtk::TreeModelFilter::set_value_impl | ( | const iterator& | row,
|  | int | column,
|  | const Glib::ValueBase & | value |
| ) |  |  | `[protected, virtual]`

Override and implement this in a derived TreeModel class, so that Row::operator() and Row::set_value() work.

You can probably just implement this by calling set_value_vfunc(). Your implementation of set_value_impl() should also call set_row_changed() after changing the value.

Reimplemented from Gtk::TreeModel.

void Gtk::TreeModelFilter::set_visible_column | ( | int | column | ) |

Sets column of the child_model to be the column where filter should look for visibility information.

columns should be a column of type G::TYPE_BOOLEAN, where `true` means that a row is visible, and `false` if not.

Since gtkmm 2.4:

Parameters:

  | column | A `int` which is the column containing the visible information.

void Gtk::TreeModelFilter::set_visible_column | ( | const TreeModelColumnBase& | column | ) |

Sets column of the child_model to be the column where filter should look for visibility information.

columns should be a column of type G::TYPE_BOOLEAN, where `true` means that a row is visible, and `false` if not.

Since gtkmm 2.4:

Parameters:

  | column | A `int` which is the column containing the visible information.

void Gtk::TreeModelFilter::set_visible_func | ( | const SlotVisible& | slot | ) |

Sets the "visible" callback used when filtering the filter.

The callback function should return true if the given row should be visible and false otherwise.

Parameters:

  | slot | A callback slot which determines whether the row should be visible.

## Friends And Related Function Documentation

Glib::RefPtr<Gtk::TreeModelFilter> wrap | ( | GtkTreeModelFilter * | object,
|  | bool | take_copy = `false` |
| ) |  |  | `[related]`

A Glib::wrap() method for this object.

Parameters:

  | object | The C instance.
  | take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns:
  A C++ instance that wraps this C instance.

The documentation for this class was generated from the following file:

- treemodelfilter.h