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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).
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.
selection |
||
model |
A GtkTreeModel being viewed |
|
path |
The GtkTreePath of the row in question |
|
path_currently_selected |
|
|
data |
user data. |
[closure] |
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.
model |
The GtkTreeModel being viewed |
|
path |
The GtkTreePath of a selected row |
|
iter |
A GtkTreeIter pointing to a selected row |
|
data |
user data. |
[closure] |
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.
GtkSelectionMode
gtk_tree_selection_get_mode (GtkTreeSelection *selection
);
Gets the selection mode for selection
. See
gtk_tree_selection_set_mode()
.
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.
GtkTreeSelectionFunc
gtk_tree_selection_get_select_function
(GtkTreeSelection *selection
);
Returns the current selection function.
[skip]
Since: 2.14
gpointer
gtk_tree_selection_get_user_data (GtkTreeSelection *selection
);
Returns the user data for the selection function.
[skip]
GtkTreeView *
gtk_tree_selection_get_tree_view (GtkTreeSelection *selection
);
Returns the tree view associated with selection
.
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
.
The iter
argument may be NULL
if you just want to test if selection
has any selected nodes.
The model
argument is filled with the current model as a convenience.
This function will not work with GTK_SELECTION_MULTIPLE
. See
gtk_tree_selection_get_selected_rows()
instead.
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.
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); |
selection |
||
model |
A pointer to set to the GtkTreeModel, or |
[out][allow-none][transfer none] |
Since: 2.2
gint
gtk_tree_selection_count_selected_rows
(GtkTreeSelection *selection
);
Returns the number of rows that have been selected in tree
.
Since: 2.2
void gtk_tree_selection_select_path (GtkTreeSelection *selection
,GtkTreePath *path
);
Select the row at path
.
void gtk_tree_selection_unselect_path (GtkTreeSelection *selection
,GtkTreePath *path
);
Unselects the row at path
.
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
void gtk_tree_selection_select_iter (GtkTreeSelection *selection
,GtkTreeIter *iter
);
Selects the specified iterator.
void gtk_tree_selection_unselect_iter (GtkTreeSelection *selection
,GtkTreeIter *iter
);
Unselects the specified iterator.
gboolean gtk_tree_selection_iter_is_selected (GtkTreeSelection *selection
,GtkTreeIter *iter
);
Returns TRUE
if the row at iter
is currently selected.
void
gtk_tree_selection_select_all (GtkTreeSelection *selection
);
Selects all the nodes. selection
must be set to GTK_SELECTION_MULTIPLE
mode.
void
gtk_tree_selection_unselect_all (GtkTreeSelection *selection
);
Unselects all the nodes.
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.
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.
selection |
||
start_path |
The initial node of the range. |
|
end_path |
The initial node of the range. |
Since: 2.2
“mode”
property“mode” GtkSelectionMode
Selection mode.
See gtk_tree_selection_set_mode()
for more information on this property.
Owner: GtkTreeSelection
Flags: Read / Write
Default value: GTK_SELECTION_SINGLE
Since: 3.2
“changed”
signalvoid 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.
treeselection |
the object which received the signal. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run First