GTK+ 3 Reference Manual: GtkTreeSelection

## GtkTreeSelection GtkTreeSelection — The selection object for GtkTreeView |

## Functions

gboolean | (*GtkTreeSelectionFunc) ()
void | (*GtkTreeSelectionForeachFunc) ()
void | gtk_tree_selection_set_mode ()
GtkSelectionMode | gtk_tree_selection_get_mode ()
void | gtk_tree_selection_set_select_function ()
GtkTreeSelectionFunc | gtk_tree_selection_get_select_function ()
gpointer | gtk_tree_selection_get_user_data ()
GtkTreeView * | gtk_tree_selection_get_tree_view ()
gboolean | gtk_tree_selection_get_selected ()
void | gtk_tree_selection_selected_foreach ()
GList * | gtk_tree_selection_get_selected_rows ()
gint | gtk_tree_selection_count_selected_rows ()
void | gtk_tree_selection_select_path ()
void | gtk_tree_selection_unselect_path ()
gboolean | gtk_tree_selection_path_is_selected ()
void | gtk_tree_selection_select_iter ()
void | gtk_tree_selection_unselect_iter ()
gboolean | gtk_tree_selection_iter_is_selected ()
void | gtk_tree_selection_select_all ()
void | gtk_tree_selection_unselect_all ()
void | gtk_tree_selection_select_range ()
void | gtk_tree_selection_unselect_range ()

## Properties

GtkSelectionMode | mode | Read / Write

## Signals

void | changed | Run First

## Types and Values

| GtkTreeSelection
| GtkTreeSelectionClass

## Object Hierarchy

        GObject
        ╰── GtkTreeSelection

## Includes

    #include <gtk/gtk.h>

## Description

The GtkTreeSelection object is a helper object to manage the selection for a GtkTreeView widget. The GtkTreeSelection object is automatically created when a new GtkTreeView widget is created, and cannot exist independently of this widget. The primary reason the GtkTreeSelection objects exists is for cleanliness of code and API. That is, there is no conceptual reason all these functions could not be methods on the GtkTreeView widget instead of a separate function.

The GtkTreeSelection object is gotten from a GtkTreeView by calling `gtk_tree_view_get_selection()`. It can be manipulated to check the selection status of the tree, as well as select and deselect individual rows. Selection is done completely view side. As a result, multiple views of the same model can have completely different selections. Additionally, you cannot change the selection of a row on the model that is not currently displayed by the view without expanding its parents first.

One of the important things to remember when monitoring the selection of a view is that the “changed” signal is mostly a hint. That is, it may only emit one signal when a range of rows is selected. Additionally, it may on occasion emit a “changed” signal when nothing has happened (mostly as a result of programmers calling select_row on an already selected row).

## Functions

### GtkTreeSelectionFunc ()

    gboolean
    (*GtkTreeSelectionFunc) (GtkTreeSelection *selection,
                             GtkTreeModel *model,
                             GtkTreePath *path,
                             gboolean path_currently_selected,
                             gpointer data);

A function used by `gtk_tree_selection_set_select_function()` to filter whether or not a row may be selected. It is called whenever a row's state might change. A return value of `TRUE` indicates to `selection` that it is okay to change the selection.

#### Parameters

selection | A GtkTreeSelection |
model | A GtkTreeModel being viewed |
path | The GtkTreePath of the row in question |
path_currently_selected | `TRUE`, if the path is currently selected |
data | user data. | [closure]

#### Returns

`TRUE`, if the selection state of the row can be toggled

### GtkTreeSelectionForeachFunc ()

    void
    (*GtkTreeSelectionForeachFunc) (GtkTreeModel *model,
                                    GtkTreePath *path,
                                    GtkTreeIter *iter,
                                    gpointer data);

A function used by `gtk_tree_selection_selected_foreach()` to map all selected rows. It will be called on every selected row in the view.

#### Parameters

model | The GtkTreeModel being viewed |
path | The GtkTreePath of a selected row |
iter | A GtkTreeIter pointing to a selected row |
data | user data. | [closure]

### gtk_tree_selection_set_mode ()

    void
    gtk_tree_selection_set_mode (GtkTreeSelection *selection,
                                 GtkSelectionMode type);

Sets the selection mode of the `selection` . If the previous type was GTK_SELECTION_MULTIPLE, then the anchor is kept selected, if it was previously selected.

#### Parameters

selection | A GtkTreeSelection. |
type | The selection mode |

### gtk_tree_selection_get_mode ()

    GtkSelectionMode
    gtk_tree_selection_get_mode (GtkTreeSelection *selection);

Gets the selection mode for `selection` . See `gtk_tree_selection_set_mode()`.

#### Parameters

selection | a GtkTreeSelection |

#### Returns

the current selection mode

### gtk_tree_selection_set_select_function ()

    void
    gtk_tree_selection_set_select_function
                                   (GtkTreeSelection *selection,
                                    GtkTreeSelectionFunc func,
                                    gpointer data,
                                    GDestroyNotify destroy);

Sets the selection function.

If set, this function is called before any node is selected or unselected, giving some control over which nodes are selected. The select function should return `TRUE` if the state of the node may be toggled, and `FALSE` if the state of the node should be left unchanged.

#### Parameters

selection | A GtkTreeSelection. |
func | The selection function. May be `NULL` |
data | The selection function’s data. May be `NULL` |
destroy | The destroy function for user data. May be `NULL` |

### gtk_tree_selection_get_select_function ()

    GtkTreeSelectionFunc
    gtk_tree_selection_get_select_function
                                   (GtkTreeSelection *selection);

Returns the current selection function.

#### Parameters

selection | A GtkTreeSelection. |

#### Returns

The function.

Since 2.14

### gtk_tree_selection_get_user_data ()

    gpointer
    gtk_tree_selection_get_user_data (GtkTreeSelection *selection);

Returns the user data for the selection function.

#### Parameters

selection | A GtkTreeSelection. |

#### Returns

The user data.

### gtk_tree_selection_get_tree_view ()

    GtkTreeView *
    gtk_tree_selection_get_tree_view (GtkTreeSelection *selection);

Returns the tree view associated with `selection` .

#### Parameters

selection | A GtkTreeSelection |

#### Returns

A GtkTreeView.

[transfer none]

### gtk_tree_selection_get_selected ()

    gboolean
    gtk_tree_selection_get_selected (GtkTreeSelection *selection,
                                     GtkTreeModel **model,
                                     GtkTreeIter *iter);

Sets `iter` to the currently selected node if `selection` is set to GTK_SELECTION_SINGLE or GTK_SELECTION_BROWSE. `iter` may be NULL if you just want to test if `selection` has any selected nodes. `model` is filled with the current model as a convenience. This function will not work if you use `selection` is GTK_SELECTION_MULTIPLE.

#### Parameters

selection | A GtkTreeSelection. |
model | A pointer to set to the GtkTreeModel, or NULL. | [out][allow-none][transfer none]
iter | The GtkTreeIter, or NULL. | [out][allow-none]

#### Returns

TRUE, if there is a selected node.

### gtk_tree_selection_selected_foreach ()

    void
    gtk_tree_selection_selected_foreach (GtkTreeSelection *selection,
                                         GtkTreeSelectionForeachFunc func,
                                         gpointer data);

Calls a function for each selected node. Note that you cannot modify the tree or selection from within this function. As a result, `gtk_tree_selection_get_selected_rows()` might be more useful.

#### Parameters

selection | A GtkTreeSelection. |
func | The function to call for each selected node. | [scope call]
data | user data to pass to the function. |

### gtk_tree_selection_get_selected_rows ()

    GList *
    gtk_tree_selection_get_selected_rows (GtkTreeSelection *selection,
                                          GtkTreeModel **model);

Creates a list of path of all selected rows. Additionally, if you are planning on modifying the model after calling this function, you may want to convert the returned list into a list of GtkTreeRowReferences. To do this, you can use `gtk_tree_row_reference_new()`.

To free the return value, use:

    1
    g_list_free_full (list, (GDestroyNotify) gtk_tree_path_free);

#### Parameters

selection | A GtkTreeSelection. |
model | A pointer to set to the GtkTreeModel, or `NULL`. | [out][allow-none][transfer none]

#### Returns

A GList containing a GtkTreePath for each selected row.

[element-type GtkTreePath][transfer full]

Since 2.2

### gtk_tree_selection_count_selected_rows ()

    gint
    gtk_tree_selection_count_selected_rows
                                   (GtkTreeSelection *selection);

Returns the number of rows that have been selected in `tree` .

#### Parameters

selection | A GtkTreeSelection. |

#### Returns

The number of rows selected.

Since 2.2

### gtk_tree_selection_select_path ()

    void
    gtk_tree_selection_select_path (GtkTreeSelection *selection,
                                    GtkTreePath *path);

Select the row at `path` .

#### Parameters

selection | A GtkTreeSelection. |
path | The GtkTreePath to be selected. |

### gtk_tree_selection_unselect_path ()

    void
    gtk_tree_selection_unselect_path (GtkTreeSelection *selection,
                                      GtkTreePath *path);

Unselects the row at `path` .

#### Parameters

selection | A GtkTreeSelection. |
path | The GtkTreePath to be unselected. |

### gtk_tree_selection_path_is_selected ()

    gboolean
    gtk_tree_selection_path_is_selected (GtkTreeSelection *selection,
                                         GtkTreePath *path);

Returns `TRUE` if the row pointed to by `path` is currently selected. If `path` does not point to a valid location, `FALSE` is returned

#### Parameters

selection | A GtkTreeSelection. |
path | A GtkTreePath to check selection on. |

#### Returns

`TRUE` if `path` is selected.

### gtk_tree_selection_select_iter ()

    void
    gtk_tree_selection_select_iter (GtkTreeSelection *selection,
                                    GtkTreeIter *iter);

Selects the specified iterator.

#### Parameters

selection | A GtkTreeSelection. |
iter | The GtkTreeIter to be selected. |

### gtk_tree_selection_unselect_iter ()

    void
    gtk_tree_selection_unselect_iter (GtkTreeSelection *selection,
                                      GtkTreeIter *iter);

Unselects the specified iterator.

#### Parameters

selection | A GtkTreeSelection. |
iter | The GtkTreeIter to be unselected. |

### gtk_tree_selection_iter_is_selected ()

    gboolean
    gtk_tree_selection_iter_is_selected (GtkTreeSelection *selection,
                                         GtkTreeIter *iter);

Returns `TRUE` if the row at `iter` is currently selected.

#### Parameters

selection | A GtkTreeSelection |
iter | A valid GtkTreeIter |

#### Returns

`TRUE`, if `iter` is selected

### gtk_tree_selection_select_all ()

    void
    gtk_tree_selection_select_all (GtkTreeSelection *selection);

Selects all the nodes. `selection` must be set to GTK_SELECTION_MULTIPLE mode.

#### Parameters

selection | A GtkTreeSelection. |

### gtk_tree_selection_unselect_all ()

    void
    gtk_tree_selection_unselect_all (GtkTreeSelection *selection);

Unselects all the nodes.

#### Parameters

selection | A GtkTreeSelection. |

### gtk_tree_selection_select_range ()

    void
    gtk_tree_selection_select_range (GtkTreeSelection *selection,
                                     GtkTreePath *start_path,
                                     GtkTreePath *end_path);

Selects a range of nodes, determined by `start_path` and `end_path` inclusive. `selection` must be set to GTK_SELECTION_MULTIPLE mode.

#### Parameters

selection | A GtkTreeSelection. |
start_path | The initial node of the range. |
end_path | The final node of the range. |

### gtk_tree_selection_unselect_range ()

    void
    gtk_tree_selection_unselect_range (GtkTreeSelection *selection,
                                       GtkTreePath *start_path,
                                       GtkTreePath *end_path);

Unselects a range of nodes, determined by `start_path` and `end_path` inclusive.

#### Parameters

selection | A GtkTreeSelection. |
start_path | The initial node of the range. |
end_path | The initial node of the range. |

Since 2.2

## Types and Values

### GtkTreeSelection

    typedef struct _GtkTreeSelection GtkTreeSelection;

### GtkTreeSelectionClass

    typedef struct {
      GObjectClass parent_class;

      void (* changed) (GtkTreeSelection *selection);
    } GtkTreeSelectionClass;

#### Members

GObjectClass `parent_class`; | The parent class. |
`changed` () | Signal emitted whenever the selection has (possibly) changed. |

## Property Details

### The `“mode”` property

      “mode”                     GtkSelectionMode

Selection mode. See `gtk_tree_selection_set_mode()` for more information on this property.

Flags: Read / Write

Default value: GTK_SELECTION_SINGLE

Since 3.2

## Signal Details

### The `“changed”` signal

    void
    user_function (GtkTreeSelection *treeselection,
                   gpointer          user_data)

Emitted whenever the selection has (possibly) changed. Please note that this signal is mostly a hint. It may only be emitted once when a range of rows are selected, and it may occasionally be emitted when nothing has happened.

#### Parameters

treeselection | the object which received the signal. |
user_data | user data set when the signal handler was connected. |

Flags: Run First

## See Also

GtkTreeView, GtkTreeViewColumn, GtkTreeModel, GtkTreeSortable, GtkTreeModelSort, GtkListStore, GtkTreeStore, GtkCellRenderer, GtkCellEditable, GtkCellRendererPixbuf, GtkCellRendererText, GtkCellRendererToggle, GtkTreeView drag-and-drop