Struct gtk4::TreeModelSort
source · #[repr(transparent)]pub struct TreeModelSort { /* private fields */ }
Expand description
Use SortListModel
instead
A GtkTreeModel which makes an underlying tree model sortable
The TreeModelSort
is a model which implements the TreeSortable
interface. It does not hold any data itself, but rather is created with
a child model and proxies its data. It has identical column types to
this child model, and the changes in the child are propagated. The
primary purpose of this model is to provide a way to sort a different
model without modifying it. Note that the sort function used by
TreeModelSort
is not guaranteed to be stable.
The use of this is best demonstrated through an example. In the
following sample code we create two TreeView
widgets each with a
view of the same data. As the model is wrapped here by a
TreeModelSort
, the two TreeView
s can each sort their
view of the data without affecting the other. By contrast, if we
simply put the same model in each widget, then sorting the first would
sort the second.
Using a TreeModelSort
⚠️ The following code is in C ⚠️
{
GtkTreeView *tree_view1;
GtkTreeView *tree_view2;
GtkTreeModel *sort_model1;
GtkTreeModel *sort_model2;
GtkTreeModel *child_model;
// get the child model
child_model = get_my_model ();
// Create the first tree
sort_model1 = gtk_tree_model_sort_new_with_model (child_model);
tree_view1 = gtk_tree_view_new_with_model (sort_model1);
// Create the second tree
sort_model2 = gtk_tree_model_sort_new_with_model (child_model);
tree_view2 = gtk_tree_view_new_with_model (sort_model2);
// Now we can sort the two models independently
gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (sort_model1),
COLUMN_1, GTK_SORT_ASCENDING);
gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (sort_model2),
COLUMN_1, GTK_SORT_DESCENDING);
}
To demonstrate how to access the underlying child model from the sort
model, the next example will be a callback for the TreeSelection
GtkTreeSelection::changed
signal. In this callback, we get a string
from COLUMN_1 of the model. We then modify the string, find the same
selected row on the child model, and change the row there.
Accessing the child model of in a selection changed callback
⚠️ The following code is in C ⚠️
void
selection_changed (GtkTreeSelection *selection, gpointer data)
{
GtkTreeModel *sort_model = NULL;
GtkTreeModel *child_model;
GtkTreeIter sort_iter;
GtkTreeIter child_iter;
char *some_data = NULL;
char *modified_data;
// Get the current selected row and the model.
if (! gtk_tree_selection_get_selected (selection,
&sort_model,
&sort_iter))
return;
// Look up the current value on the selected row and get
// a new value to change it to.
gtk_tree_model_get (GTK_TREE_MODEL (sort_model), &sort_iter,
COLUMN_1, &some_data,
-1);
modified_data = change_the_data (some_data);
g_free (some_data);
// Get an iterator on the child model, instead of the sort model.
gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (sort_model),
&child_iter,
&sort_iter);
// Get the child model and change the value of the row. In this
// example, the child model is a GtkListStore. It could be any other
// type of model, though.
child_model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (sort_model));
gtk_list_store_set (GTK_LIST_STORE (child_model), &child_iter,
COLUMN_1, &modified_data,
-1);
g_free (modified_data);
}
Properties
model
Readable | Writeable | Construct Only
Implements
TreeModelSortExt
, glib::ObjectExt
, TreeDragSourceExt
, TreeModelExt
, TreeSortableExt
, TreeModelExtManual
, TreeSortableExtManual
Implementations§
source§impl TreeModelSort
impl TreeModelSort
pub const NONE: Option<&'static TreeModelSort> = None
sourcepub fn with_model(child_model: &impl IsA<TreeModel>) -> TreeModelSort
pub fn with_model(child_model: &impl IsA<TreeModel>) -> TreeModelSort
Creates a new TreeModelSort
, with @child_model as the child model.
child_model
Returns
A new TreeModelSort
.
Trait Implementations§
source§impl Clone for TreeModelSort
impl Clone for TreeModelSort
source§impl Debug for TreeModelSort
impl Debug for TreeModelSort
source§impl Display for TreeModelSort
impl Display for TreeModelSort
source§impl HasParamSpec for TreeModelSort
impl HasParamSpec for TreeModelSort
type ParamSpec = ParamSpecObject
§type SetValue = TreeModelSort
type SetValue = TreeModelSort
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, TreeModelSort>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for TreeModelSort
impl Hash for TreeModelSort
source§impl Ord for TreeModelSort
impl Ord for TreeModelSort
source§impl ParentClassIs for TreeModelSort
impl ParentClassIs for TreeModelSort
source§impl<OT: ObjectType> PartialEq<OT> for TreeModelSort
impl<OT: ObjectType> PartialEq<OT> for TreeModelSort
source§impl<OT: ObjectType> PartialOrd<OT> for TreeModelSort
impl<OT: ObjectType> PartialOrd<OT> for TreeModelSort
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for TreeModelSort
impl StaticType for TreeModelSort
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for TreeModelSort
impl IsA<TreeDragSource> for TreeModelSort
impl IsA<TreeModel> for TreeModelSort
impl IsA<TreeSortable> for TreeModelSort
Auto Trait Implementations§
impl RefUnwindSafe for TreeModelSort
impl !Send for TreeModelSort
impl !Sync for TreeModelSort
impl Unpin for TreeModelSort
impl UnwindSafe for TreeModelSort
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) -> SignalHandlerIdwhere
F: Fn(&T, &ParamSpec),
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F ) -> SignalHandlerIdwhere F: Fn(&T, &ParamSpec),
notify
signal of the object. Read more