Gtk::TreeModel Class Reference
TreeView Classes

This class defines a generic tree interface for use by the Gtk::TreeView widget. More...

`#include <gtkmm/treemodel.h>`

Inheritance diagram for Gtk::TreeModel:
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## Public Types

typedef TreeModelColumnRecord | ColumnRecord
typedef TreeNodeChildren | Children
typedef Children::iterator | iterator
typedef Children::const_iterator | const_iterator
typedef Children::reverse_iterator | reverse_iterator
typedef Children::const_reverse_iterator | const_reverse_iterator
typedef TreeRow | Row
typedef TreePath | Path
typedef TreeRowReference | RowReference
typedef sigc::slot< bool, const TreeModel::iterator & > | SlotForeachIter
| The type of callback slot used by foreach_iter().
typedef sigc::slot< bool, const TreeModel::Path & > | SlotForeachPath
| The type of callback slot used by foreach_path().
typedef sigc::slot< bool, const TreeModel::Path &, const TreeModel::iterator & > | SlotForeachPathAndIter
| The type of callback slot used by foreach().

## Public Member Functions

| TreeModel (TreeModel &&src) noexcept
TreeModel & | operator= (TreeModel &&src) noexcept
| ~TreeModel () noexcept override
GtkTreeModel * | gobj ()
| Provides access to the underlying C GObject.
const GtkTreeModel * | gobj () const
| Provides access to the underlying C GObject.
iterator | get_iter (const Path & path)
| Returns a valid iterator pointing to path.
iterator | get_iter (const Glib::ustring &path_string)
| Returns a valid iterator pointing to path_string.
Children | children ()
| This returns an STL-like container API, for iterating over the rows.
Children | children () const
| This returns an STL-like container API, for iterating over the rows.
void | foreach_iter (const SlotForeachIter &slot)
| Calls a callback of type SlotForeachIter on each node in the model in a depth-first fashion.
void | foreach_path (const SlotForeachPath &slot)
| Calls a callback of type SlotForeachPath on each node in the model in a depth-first fashion.
void | foreach (const SlotForeachPathAndIter &slot)
| Calls a callback of type SlotForeachPathAndIter on each node in the model in a depth-first fashion.
TreeModelFlags | get_flags () const
| Returns a set of flags supported by this interface.
int | get_n_columns () const
| Returns the number of columns supported by tree_model.
GType | get_column_type (int index) const
| Returns the type of the column.
TreeModel::Path | get_path (const iterator &iter) const
| Returns a Gtk::TreePath referenced by iter.
void | row_changed (const Path & path, const iterator &iter)
| Emits the Gtk::TreeModel::signal_row_changed() signal on tree_model.
void | row_inserted (const Path & path, const iterator &iter)
| Emits the Gtk::TreeModel::signal_row_inserted() signal on tree_model.
void | row_has_child_toggled (const Path & path, const iterator &iter)
| Emits the Gtk::TreeModel::signal_row_has_child_toggled() signal on tree_model.
void | row_deleted (const Path & path)
| Emits the Gtk::TreeModel::signal_row_deleted() signal on tree_model.
void | rows_reordered (const Path & path, const iterator &iter, const std::vector< int > &new_order)
| Emits the "rows_reordered" signal on the tree model.
void | rows_reordered (const Path & path, const std::vector< int > &new_order)
| Emits the "rows_reordered" signal on the tree model.
void | rows_reordered (const Path & path, const iterator &iter, int *new_order)
| Emits the Gtk::TreeModel::signal_rows_reordered() signal on tree_model.
Glib::ustring | get_string (const iterator &iter) const
| Generates a string representation of the iter.
Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > | signal_row_changed ()
Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > | signal_row_inserted ()
Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > | signal_row_has_child_toggled ()
Glib::SignalProxy< void, const TreeModel::Path & > | signal_row_deleted ()
Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator &, int * > | signal_rows_reordered ()

## Static Public Member Functions

static void | add_interface (GType gtype_implementer)
static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system.

## Protected Member Functions

| TreeModel ()
| You should derive from this class to use it.
virtual TreeModelFlags | get_flags_vfunc () const
virtual int | get_n_columns_vfunc () const
virtual GType | get_column_type_vfunc (int index) const
virtual bool | iter_next_vfunc (const iterator &iter, iterator &iter_next) const
| Override and implement this in a derived TreeModel class.
virtual bool | get_iter_vfunc (const Path & path, iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual bool | iter_children_vfunc (const iterator & parent, iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual bool | iter_parent_vfunc (const iterator &child, iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual bool | iter_nth_child_vfunc (const iterator & parent, int n, iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual bool | iter_nth_root_child_vfunc (int n, iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual bool | iter_has_child_vfunc (const iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual int | iter_n_children_vfunc (const iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual int | iter_n_root_children_vfunc () const
| Override and implement this in a derived TreeModel class.
virtual void | ref_node_vfunc (const iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual void | unref_node_vfunc (const iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual TreeModel::Path | get_path_vfunc (const iterator &iter) const
| Override and implement this in a derived TreeModel class.
virtual void | get_value_vfunc (const iterator &iter, int column, Glib::ValueBase & value) const
| Override and implement this in a derived TreeModel class.
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.
virtual void | get_value_impl (const iterator &row, int column, Glib::ValueBase & value) const
virtual void | on_row_changed (const TreeModel::Path & path, const TreeModel::iterator &iter)
| This is a default handler for the signal signal_row_changed().
virtual void | on_row_inserted (const TreeModel::Path & path, const TreeModel::iterator &iter)
| This is a default handler for the signal signal_row_inserted().
virtual void | on_row_has_child_toggled (const TreeModel::Path & path, const TreeModel::iterator &iter)
| This is a default handler for the signal signal_row_has_child_toggled().
virtual void | on_row_deleted (const TreeModel::Path & path)
| This is a default handler for the signal signal_row_deleted().
virtual void | on_rows_reordered (const TreeModel::Path & path, const TreeModel::iterator &iter, int *new_order)
| This is a default handler for the signal signal_rows_reordered().

## Related Symbols

(Note that these are not member symbols.)
Glib::RefPtr< Gtk::TreeModel > | wrap (GtkTreeModel *object, bool take_copy=false)
| A Glib::wrap() method for this object.

## Detailed Description

This class defines a generic tree interface for use by the Gtk::TreeView widget.

It is is designed to be usable with any appropriate data structure. The programmer just has to implement this interface on their own data type for it to be viewable by a Gtk::TreeView widget.

The model is represented as a hierarchical tree of strongly-typed, columned data. In other words, the model can be seen as a tree where every node has different values depending on which column is being queried. The type of data found in a column is determined by TreeModel::Column<> templates. The types are homogeneous per column across all nodes. It is important to note that this interface only provides a way of examining a model and observing changes. The implementation of each individual model decides how and if changes are made.

In order to make life simpler for programmers who do not need to write their own specialized model, two generic models are provided - the Gtk::TreeStore and the Gtk::ListStore. To use these, the developer simply pushes data into these models as necessary. These models provide the data structure as well as all appropriate tree interfaces. As a result, implementing drag and drop, sorting, and storing data is trivial. For the vast majority of trees and lists, these two models are sufficient.

Models are accessed on a node/column level of granularity. One can query for the value of a model at a certain node and a certain column on that node. There are two structures used to reference a particular node in a model. They are the Path and the iterator. Most of the interface consists of operations on an iterator.

A Gtk::TreeModel::Path is essentially a potential node. It is a location on a model that may or may not actually correspond to a node on a specific model.

By contrast, an Gtk::TreeModel::iterator is a reference to a specific node on a specific model. One can convert a path to an iterator by calling Gtk::TreeModel::get_iter(). These iterators are the primary way of accessing a model and are similar to the iterators used by Gtk::TextBuffer. The model interface defines a set of operations using them for navigating the model.

The RowReference is also useful, because it remains valid as long as there is an existing row pointed to by it's path. You can convert between RowReferences and iterators and Path s.

## Member Typedef Documentation

## Children

typedef TreeNodeChildren Gtk::TreeModel::Children

## ColumnRecord

typedef TreeModelColumnRecord Gtk::TreeModel::ColumnRecord

## const_iterator

typedef Children::const_iterator Gtk::TreeModel::const_iterator

## const_reverse_iterator

typedef Children::const_reverse_iterator Gtk::TreeModel::const_reverse_iterator

Deprecated:
  This reverse_iterator has never worked, use the normal (forward) iterator instead.

## iterator

typedef Children::iterator Gtk::TreeModel::iterator

## Path

typedef TreePath Gtk::TreeModel::Path

## reverse_iterator

typedef Children::reverse_iterator Gtk::TreeModel::reverse_iterator

Deprecated:
  This reverse_iterator has never worked, use the normal (forward) iterator instead.

## Row

typedef TreeRow Gtk::TreeModel::Row

## RowReference

typedef TreeRowReference Gtk::TreeModel::RowReference

## SlotForeachIter

typedef sigc::slot<bool, const TreeModel::iterator&> Gtk::TreeModel::SlotForeachIter

The type of callback slot used by foreach_iter().

If the callback function returns true, then the tree ceases to be walked, and foreach_iter() returns.

For example: bool on_foreach_iter(const Gtk::TreeModel::iterator& iter);

## SlotForeachPath

typedef sigc::slot<bool, const TreeModel::Path&> Gtk::TreeModel::SlotForeachPath

The type of callback slot used by foreach_path().

For example: bool on_foreach_path(const Gtk::TreeModel::Path& path);

If the callback function returns true, then the tree ceases to be walked, and foreach_path() returns.

## SlotForeachPathAndIter

typedef sigc::slot<bool, const TreeModel::Path&, const TreeModel::iterator&> Gtk::TreeModel::SlotForeachPathAndIter

The type of callback slot used by foreach().

For example: bool on_foreach(const Gtk::TreeModel::Path& path, const Gtk::TreeModel::iterator& iter);

If the callback function returns true, then the tree ceases to be walked, and foreach() returns.

## Constructor & Destructor Documentation

## TreeModel() [1/2]

Gtk::TreeModel::TreeModel | ( |  | ) |

protected

You should derive from this class to use it.

## TreeModel() [2/2]

Gtk::TreeModel::TreeModel | ( | TreeModel && | src | ) |

noexcept

## ~TreeModel()

Gtk::TreeModel::~TreeModel | ( |  | ) |

override noexcept

## Member Function Documentation

## add_interface()

static void Gtk::TreeModel::add_interface | ( | GType | gtype_implementer | ) |

static

## children() [1/2]

Children Gtk::TreeModel::children | ( |  | ) |

This returns an STL-like container API, for iterating over the rows.

## children() [2/2]

Children Gtk::TreeModel::children | ( |  | ) | const

This returns an STL-like container API, for iterating over the rows.

## foreach()

void Gtk::TreeModel::foreach | ( | const SlotForeachPathAndIter & | slot | ) |

Calls a callback of type SlotForeachPathAndIter on each node in the model in a depth-first fashion.

If the callback function returns true, then the tree ceases to be walked, and foreach() returns.

Parameters

  slot | The function to call for each selected node.

## foreach_iter()

void Gtk::TreeModel::foreach_iter | ( | const SlotForeachIter & | slot | ) |

Calls a callback of type SlotForeachIter on each node in the model in a depth-first fashion.

If the callback function returns true, then the tree ceases to be walked, and foreach_iter() returns.

Parameters

  slot | The function to call for each selected node.

## foreach_path()

void Gtk::TreeModel::foreach_path | ( | const SlotForeachPath & | slot | ) |

Calls a callback of type SlotForeachPath on each node in the model in a depth-first fashion.

If the callback function returns true, then the tree ceases to be walked, and foreach_path() returns.

Parameters

  slot | The function to call for each selected node.

## get_column_type()

GType Gtk::TreeModel::get_column_type | ( | int | index | ) | const

Returns the type of the column.

Parameters

  index | The column index.

Returns
  The type of the column.

## get_column_type_vfunc()

virtual GType Gtk::TreeModel::get_column_type_vfunc | ( | int | index | ) | const

protected virtual

## get_flags()

TreeModelFlags Gtk::TreeModel::get_flags | ( |  | ) | const

Returns a set of flags supported by this interface.

The flags are a bitwise combination of Gtk::TreeModelFlags. The flags supported should not change during the lifetime of the tree_model.

Returns
  The flags supported by this interface.

## get_flags_vfunc()

virtual TreeModelFlags Gtk::TreeModel::get_flags_vfunc | ( |  | ) | const

protected virtual

## get_iter() [1/2]

iterator Gtk::TreeModel::get_iter | ( | const Glib::ustring & | path_string | ) |

Returns a valid iterator pointing to path_string.

Parameters

  path_string | The path, as a string representation.

Returns
  A valid iterator pointing to the path, or an invalid iterator if that is not possible.

## get_iter() [2/2]

iterator Gtk::TreeModel::get_iter | ( | const Path & | path | ) |

Returns a valid iterator pointing to path.

Parameters

  path | The Gtk::TreeModel::Path.

Returns
  A valid iterator pointing to the path, or an invalid iterator if that is not possible.

## get_iter_vfunc()

virtual bool Gtk::TreeModel::get_iter_vfunc | ( | const Path & | path,
|  | iterator & | iter
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter to a valid iterator pointing to path

Parameters

  path | An path to a node.
  iter | An iterator that will be set to refer to a node to the path, or will be set as invalid.

Returns
  true if the operation was possible.

## get_n_columns()

int Gtk::TreeModel::get_n_columns | ( |  | ) | const

Returns the number of columns supported by tree_model.

Returns
  The number of columns.

## get_n_columns_vfunc()

virtual int Gtk::TreeModel::get_n_columns_vfunc | ( |  | ) | const

protected virtual

## get_path()

TreeModel::Path Gtk::TreeModel::get_path | ( | const iterator & | iter | ) | const

Returns a Gtk::TreePath referenced by iter.

Parameters

  iter | The Gtk::TreeIter.

Returns
  A Gtk::TreePath.

## get_path_vfunc()

virtual TreeModel::Path Gtk::TreeModel::get_path_vfunc | ( | const iterator & | iter | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Returns a Path referenced by iter.

Parameters

  iter | The iterator.

Returns
  The path.

## get_string()

Glib::ustring Gtk::TreeModel::get_string | ( | const iterator & | iter | ) | const

Generates a string representation of the iter.

This string is a “:” separated list of numbers. For example, “4:10:0:3” would be an acceptable return value for this string.

Since gtkmm 2.2:

Parameters

  iter | An Gtk::TreeIter.

Returns
  The string.

## get_type()

static GType Gtk::TreeModel::get_type | ( |  | ) |

static

Get the GType for this class, for use with the underlying GObject type system.

## get_value_impl()

virtual void Gtk::TreeModel::get_value_impl | ( | const iterator & | row,
|  | int | column,
|  | Glib::ValueBase & | value
| ) |  | const

protected virtual

## get_value_vfunc()

virtual void Gtk::TreeModel::get_value_vfunc | ( | const iterator & | iter,
|  | int | column,
|  | Glib::ValueBase & | value
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Initializes and sets value to that at column.

Parameters

  iter | The iterator.
  column | The column to lookup the value at.
  value | An empty Glib:Value to set.

## gobj() [1/2]

GtkTreeModel * Gtk::TreeModel::gobj | ( |  | ) |

inline

Provides access to the underlying C GObject.

## gobj() [2/2]

const GtkTreeModel * Gtk::TreeModel::gobj | ( |  | ) | const

inline

Provides access to the underlying C GObject.

## iter_children_vfunc()

virtual bool Gtk::TreeModel::iter_children_vfunc | ( | const iterator & | parent,
|  | iterator & | iter
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter to refer to the first child of parent. If parent has no children, false is returned and iter is set to be invalid.

Parameters

  parent | An iterator.
  iter | An iterator that will be set to refer to the firt child node, or will be set as invalid.

Returns
  true if the operation was possible.

## iter_has_child_vfunc()

virtual bool Gtk::TreeModel::iter_has_child_vfunc | ( | const iterator & | iter | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Returns true if iter has children, false otherwise.

Parameters

  iter | The iterator to test for children.

Returns
  true if iter has children.

## iter_n_children_vfunc()

virtual int Gtk::TreeModel::iter_n_children_vfunc | ( | const iterator & | iter | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Returns the number of children that iter has. See also iter_n_root_children_vfunc().

Parameters

  iter | The iterator to test for children.

Returns
  The number of children of iter.

## iter_n_root_children_vfunc()

virtual int Gtk::TreeModel::iter_n_root_children_vfunc | ( |  | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Returns the number of toplevel nodes. See also iter_n_children().

Returns
  The number of children at the root level.

## iter_next_vfunc()

virtual bool Gtk::TreeModel::iter_next_vfunc | ( | const iterator & | iter,
|  | iterator & | iter_next
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter_next to refer to the node following iter it at the current level. If there is no next iter, false is returned and iter_next is set to be invalid.

Parameters

  iter | An iterator.
  iter_next | An iterator that will be set to refer to the next node, or will be set as invalid.

Returns
  true if the operation was possible.

## iter_nth_child_vfunc()

virtual bool Gtk::TreeModel::iter_nth_child_vfunc | ( | const iterator & | parent,
|  | int | n,
|  | iterator & | iter
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter to be the child of parent using the given index. The first index is 0. If n is too big, or parent has no children, iter is set to an invalid iterator and false is returned. See also iter_nth_root_child_vfunc()

Parameters

  parent | An iterator.
  n | The index of the child node to which iter should be set.
  iter | An iterator that will be set to refer to the nth node, or will be set as invalid.

Returns
  true if the operation was possible.

## iter_nth_root_child_vfunc()

virtual bool Gtk::TreeModel::iter_nth_root_child_vfunc | ( | int | n,
|  | iterator & | iter
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter to be the child of at the root level using the given index. The first index is 0. If n is too big, or if there are no children, iter is set to an invalid iterator and false is returned. See also iter_nth_child_vfunc().

Parameters

  n | The index of the child node to which iter should be set.
  iter | An iterator that will be set to refer to the nth node, or will be set as invalid.

Returns
  true if the operation was possible.

## iter_parent_vfunc()

virtual bool Gtk::TreeModel::iter_parent_vfunc | ( | const iterator & | child,
|  | iterator & | iter
| ) |  | const

protected virtual

Override and implement this in a derived TreeModel class.

Sets iter to be the parent of child. If child is at the toplevel, and doesn't have a parent, then iter is set to an invalid iterator and false is returned.

Parameters

  child | An iterator.
  iter | An iterator that will be set to refer to the parent node, or will be set as invalid.

Returns
  true if the operation was possible.

## on_row_changed()

virtual void Gtk::TreeModel::on_row_changed | ( | const TreeModel::Path & | path,
|  | const TreeModel::iterator & | iter
| ) |  |

protected virtual

This is a default handler for the signal signal_row_changed().

## on_row_deleted()

virtual void Gtk::TreeModel::on_row_deleted | ( | const TreeModel::Path & | path | ) |

protected virtual

This is a default handler for the signal signal_row_deleted().

## on_row_has_child_toggled()

virtual void Gtk::TreeModel::on_row_has_child_toggled | ( | const TreeModel::Path & | path,
|  | const TreeModel::iterator & | iter
| ) |  |

protected virtual

This is a default handler for the signal signal_row_has_child_toggled().

## on_row_inserted()

virtual void Gtk::TreeModel::on_row_inserted | ( | const TreeModel::Path & | path,
|  | const TreeModel::iterator & | iter
| ) |  |

protected virtual

This is a default handler for the signal signal_row_inserted().

## on_rows_reordered()

virtual void Gtk::TreeModel::on_rows_reordered | ( | const TreeModel::Path & | path,
|  | const TreeModel::iterator & | iter,
|  | int * | new_order
| ) |  |

protected virtual

This is a default handler for the signal signal_rows_reordered().

## operator=()

TreeModel & Gtk::TreeModel::operator= | ( | TreeModel && | src | ) |

noexcept

## ref_node_vfunc()

virtual void Gtk::TreeModel::ref_node_vfunc | ( | const iterator & | iter | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Lets the tree ref the node. This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

This function is primarily meant as a way for views to let caching model know when nodes are being displayed (and hence, whether or not to cache that node.) For example, a file-system based model would not want to keep the entire file-hierarchy in memory, just the sections that are currently being displayed by every current view.

A model should be expected to be able to get an iter independent of its reffed state.

Parameters

  iter | the iterator.

## row_changed()

void Gtk::TreeModel::row_changed | ( | const Path & | path,
|  | const iterator & | iter
| ) |  |

Emits the Gtk::TreeModel::signal_row_changed() signal on tree_model.

Parameters

  path | A Gtk::TreePath-struct pointing to the changed row.
  iter | A valid Gtk::TreeIter-struct pointing to the changed row.

## row_deleted()

void Gtk::TreeModel::row_deleted | ( | const Path & | path | ) |

Emits the Gtk::TreeModel::signal_row_deleted() signal on tree_model.

This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

Nodes that are deleted are not unreffed, this means that any outstanding references on the deleted node should not be released.

Parameters

  path | A Gtk::TreePath-struct pointing to the previous location of the deleted row.

## row_has_child_toggled()

void Gtk::TreeModel::row_has_child_toggled | ( | const Path & | path,
|  | const iterator & | iter
| ) |  |

Emits the Gtk::TreeModel::signal_row_has_child_toggled() signal on tree_model.

This should be called by models after the child state of a node changes.

Parameters

  path | A Gtk::TreePath-struct pointing to the changed row.
  iter | A valid Gtk::TreeIter-struct pointing to the changed row.

## row_inserted()

void Gtk::TreeModel::row_inserted | ( | const Path & | path,
|  | const iterator & | iter
| ) |  |

Emits the Gtk::TreeModel::signal_row_inserted() signal on tree_model.

Parameters

  path | A Gtk::TreePath-struct pointing to the inserted row.
  iter | A valid Gtk::TreeIter-struct pointing to the inserted row.

## rows_reordered() [1/3]

void Gtk::TreeModel::rows_reordered | ( | const Path & | path,
|  | const iterator & | iter,
|  | const std::vector< int > & | new_order
| ) |  |

Emits the "rows_reordered" signal on the tree model.

This should be called by custom models when their rows have been reordered.

Parameters

  path | A tree path pointing to the tree node whose children have been reordered.
  iter | A valid iterator pointing to the node whose children have been reordered. See also, rows_reordered(const Path& path, const std::vector<int>& new_order), if the path has a depth of 0.
  new_order | An array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order<literal>[newpos] = oldpos.

## rows_reordered() [2/3]

void Gtk::TreeModel::rows_reordered | ( | const Path & | path,
|  | const iterator & | iter,
|  | int * | new_order
| ) |  |

Emits the Gtk::TreeModel::signal_rows_reordered() signal on tree_model.

This should be called by models when their rows have been reordered.

Parameters

  path | A Gtk::TreePath pointing to the tree node whose children have been reordered.
  iter | A valid Gtk::TreeIter pointing to the node whose children have been reordered, or `nullptr` if the depth of path is 0.
  new_order | An array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order`[newpos] = oldpos`.

## rows_reordered() [3/3]

void Gtk::TreeModel::rows_reordered | ( | const Path & | path,
|  | const std::vector< int > & | new_order
| ) |  |

Emits the "rows_reordered" signal on the tree model.

This should be called by custom models when their rows have been reordered. This method overload is for nodes whose path has a depth of 0.

Since gtkmm 2.10:

Parameters

  path | A tree path pointing to the tree node whose children have been reordered.
  new_order | An array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order<literal>[newpos] = oldpos.

## set_value_impl()

virtual void Gtk::TreeModel::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.

Your implementation of set_value_impl() should call row_changed() after changing the value.

Reimplemented in Gtk::ListStore, Gtk::TreeModelFilter, Gtk::TreeModelSort, and Gtk::TreeStore.

## signal_row_changed()

Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > Gtk::TreeModel::signal_row_changed | ( |  | ) |

Slot Prototype:
  `void on_my_row_changed(const TreeModel::Path& path, const TreeModel::iterator& iter)`

Flags: Run Last

This signal is emitted when a row in the model has changed.

Parameters

  path | A Gtk::TreePath-struct identifying the changed row.
  iter | A valid Gtk::TreeIter-struct pointing to the changed row.

## signal_row_deleted()

Glib::SignalProxy< void, const TreeModel::Path & > Gtk::TreeModel::signal_row_deleted | ( |  | ) |

Slot Prototype:
  `void on_my_row_deleted(const TreeModel::Path& path)`

Flags: Run First

This signal is emitted when a row has been deleted.

Note that no iterator is passed to the signal handler, since the row is already deleted.

This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

Parameters

  path | A Gtk::TreePath-struct identifying the row.

## signal_row_has_child_toggled()

Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > Gtk::TreeModel::signal_row_has_child_toggled | ( |  | ) |

Slot Prototype:
  `void on_my_row_has_child_toggled(const TreeModel::Path& path, const TreeModel::iterator& iter)`

Flags: Run Last

This signal is emitted when a row has gotten the first child row or lost its last child row.

Parameters

  path | A Gtk::TreePath-struct identifying the row.
  iter | A valid Gtk::TreeIter-struct pointing to the row.

## signal_row_inserted()

Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator & > Gtk::TreeModel::signal_row_inserted | ( |  | ) |

Slot Prototype:
  `void on_my_row_inserted(const TreeModel::Path& path, const TreeModel::iterator& iter)`

Flags: Run First

This signal is emitted when a new row has been inserted in the model.

Note that the row may still be empty at this point, since it is a common pattern to first insert an empty row, and then fill it with the desired values.

Parameters

  path | A Gtk::TreePath-struct identifying the new row.
  iter | A valid Gtk::TreeIter-struct pointing to the new row.

## signal_rows_reordered()

Glib::SignalProxy< void, const TreeModel::Path &, const TreeModel::iterator &, int * > Gtk::TreeModel::signal_rows_reordered | ( |  | ) |

Slot Prototype:
  `void on_my_rows_reordered(const TreeModel::Path& path, const TreeModel::iterator& iter, int* new_order)`

Flags: Run First

This signal is emitted when the children of a node in the Gtk::TreeModel have been reordered.

Note that this signal is not emitted when rows are reordered by DND, since this is implemented by removing and then reinserting the row.

Parameters

  path | A Gtk::TreePath-struct identifying the tree node whose children have been reordered.
  iter | A valid Gtk::TreeIter-struct pointing to the node whose children have been reordered, or `nullptr` if the depth of path is 0.
  new_order | An array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order`[newpos] = oldpos`.

## unref_node_vfunc()

virtual void Gtk::TreeModel::unref_node_vfunc | ( | const iterator & | iter | ) | const

protected virtual

Override and implement this in a derived TreeModel class.

Lets the tree unref the node. This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

For more information on what this means, see unref_node_vfunc(). Please note that nodes that are deleted are not unreffed.

Parameters

  iter | the iterator.

## Friends And Related Symbol Documentation

## wrap()

Glib::RefPtr< Gtk::TreeModel > wrap | ( | GtkTreeModel * | 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.