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constraint layout: Provide list models

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Provide list models for the constraints and guides,
so we can show them in the inspector, and use them
in e.g. the constraints editor.
This commit is contained in:
Matthias Clasen 2019-07-01 20:14:26 -04:00
parent b2f15a622d
commit 274c47e5ba
3 changed files with 137 additions and 0 deletions
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4
docs/reference/gtk/gtk4-sections.txt
View File

@ -7338,6 +7338,10 @@ gtk_constraint_layout_remove_guide
gtk_constraint_layout_add_constraints_from_description
gtk_constraint_layout_add_constraints_from_descriptionv
<SUBSECTION>
gtk_constraint_layout_observe_constraints
gtk_constraint_layout_observe_guides
<SUBSECTION Standard>
GTK_TYPE_CONSTRAINT_LAYOUT
gtk_constraint_layout_get_type

128
gtk/gtkconstraintlayout.c
View File

@ -253,6 +253,9 @@ struct _GtkConstraintLayout
/* HashSet<GtkConstraintGuide> */
GHashTable *guides;
GListStore *constraints_observer;
GListStore *guides_observer;
};
G_DEFINE_TYPE (GtkConstraintLayoutChild, gtk_constraint_layout_child, GTK_TYPE_LAYOUT_CHILD)
@ -534,6 +537,19 @@ gtk_constraint_layout_finalize (GObject *gobject)
{
GtkConstraintLayout *self = GTK_CONSTRAINT_LAYOUT (gobject);
if (self->constraints_observer)
{
g_list_store_remove_all (self->constraints_observer);
g_object_remove_weak_pointer ((GObject *)self->constraints_observer,
(gpointer *)&self->constraints_observer);
}
if (self->guides_observer)
{
g_list_store_remove_all (self->guides_observer);
g_object_remove_weak_pointer ((GObject *)self->guides_observer,
(gpointer *)&self->guides_observer);
}
g_clear_pointer (&self->bound_attributes, g_hash_table_unref);
g_clear_pointer (&self->constraints, g_hash_table_unref);
g_clear_pointer (&self->guides, g_hash_table_unref);
@ -1709,10 +1725,32 @@ gtk_constraint_layout_add_constraint (GtkConstraintLayout *layout,
layout_add_constraint (layout, constraint);
g_hash_table_add (layout->constraints, constraint);
if (layout->constraints_observer)
g_list_store_append (layout->constraints_observer, constraint);
gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (layout));
}
static void
list_store_remove_item (GListStore *store,
gpointer item)
{
int n_items;
int i;
n_items = g_list_model_get_n_items (G_LIST_MODEL (store));
for (i = 0; i < n_items; i++)
{
gpointer *model_item = g_list_model_get_item (G_LIST_MODEL (store), i);
g_object_unref (model_item);
if (item == model_item)
{
g_list_store_remove (store, i);
break;
}
}
}
/**
* gtk_constraint_layout_remove_constraint:
* @layout: a #GtkConstraintLayout
@ -1731,6 +1769,8 @@ gtk_constraint_layout_remove_constraint (GtkConstraintLayout *layout,
gtk_constraint_detach (constraint);
g_hash_table_remove (layout->constraints, constraint);
if (layout->constraints_observer)
list_store_remove_item (layout->constraints_observer, constraint);
gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (layout));
}
@ -1757,6 +1797,8 @@ gtk_constraint_layout_remove_all_constraints (GtkConstraintLayout *layout)
gtk_constraint_detach (constraint);
g_hash_table_iter_remove (&iter);
}
if (layout->constraints_observer)
g_list_store_remove_all (layout->constraints_observer);
gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (layout));
}
@ -1783,6 +1825,8 @@ gtk_constraint_layout_add_guide (GtkConstraintLayout *layout,
gtk_constraint_guide_set_layout (guide, layout);
g_hash_table_add (layout->guides, guide);
if (layout->guides_observer)
g_list_store_append (layout->guides_observer, guide);
gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (layout));
}
@ -1807,6 +1851,8 @@ gtk_constraint_layout_remove_guide (GtkConstraintLayout *layout,
gtk_constraint_guide_set_layout (guide, NULL);
g_hash_table_remove (layout->guides, guide);
if (layout->guides_observer)
list_store_remove_item (layout->guides_observer, guide);
gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (layout));
}
@ -2026,6 +2072,8 @@ gtk_constraint_layout_add_constraints_from_descriptionv (GtkConstraintLayout *la
layout_add_constraint (layout, constraint);
g_hash_table_add (layout->constraints, constraint);
if (layout->constraints_observer)
g_list_store_append (layout->constraints_observer, constraint);
res = g_list_prepend (res, constraint);
}
@ -2116,3 +2164,83 @@ gtk_constraint_layout_add_constraints_from_description (GtkConstraintLayout *lay
return res;
}
/**
* gtk_constraint_layout_observe_constraints:
* @layout: a #GtkConstraintLayout
*
* Returns a #GListModel to track the constraints that are
* part of @layout.
*
* Calling this function will enable extra internal bookkeeping
* to track constraints and emit signals on the returned listmodel.
* It may slow down operations a lot.
*
* Applications should try hard to avoid calling this function
* because of the slowdowns.
*
* Returns: (transfer full): a #GListModel tracking @layout's
* constraints
*/
GListModel *
gtk_constraint_layout_observe_constraints (GtkConstraintLayout *layout)
{
GHashTableIter iter;
gpointer key;
if (layout->constraints_observer)
return g_object_ref (G_LIST_MODEL (layout->constraints_observer));
layout->constraints_observer = g_list_store_new (GTK_TYPE_CONSTRAINT);
g_object_add_weak_pointer ((GObject *)layout->constraints_observer,
(gpointer *)&layout->constraints_observer);
g_hash_table_iter_init (&iter, layout->constraints);
while (g_hash_table_iter_next (&iter, &key, NULL))
{
GtkConstraint *constraint = key;
g_list_store_append (layout->constraints_observer, constraint);
}
return G_LIST_MODEL (layout->constraints_observer);
}
/**
* gtk_constraint_layout_observe_guides:
* @layout: a #GtkConstraintLayout
*
* Returns a #GListModel to track the guides that are
* part of @layout.
*
* Calling this function will enable extra internal bookkeeping
* to track guides and emit signals on the returned listmodel.
* It may slow down operations a lot.
*
* Applications should try hard to avoid calling this function
* because of the slowdowns.
*
* Returns: (transfer full): a #GListModel tracking @layout's
* guides
*/
GListModel *
gtk_constraint_layout_observe_guides (GtkConstraintLayout *layout)
{
GHashTableIter iter;
gpointer key;
if (layout->guides_observer)
return g_object_ref (G_LIST_MODEL (layout->guides_observer));
layout->guides_observer = g_list_store_new (GTK_TYPE_CONSTRAINT_GUIDE);
g_object_add_weak_pointer ((GObject *)layout->guides_observer,
(gpointer *)&layout->guides_observer);
g_hash_table_iter_init (&iter, layout->guides);
while (g_hash_table_iter_next (&iter, &key, NULL))
{
GtkConstraintGuide *guide = key;
g_list_store_append (layout->guides_observer, guide);
}
return G_LIST_MODEL (layout->guides_observer);
}

5
gtk/gtkconstraintlayout.h
View File

@ -85,4 +85,9 @@ GList * gtk_constraint_layout_add_constraints_from_descriptionv
GHashTable *views,
GError **error);
GDK_AVAILABLE_IN_ALL
GListModel * gtk_constraint_layout_observe_constraints (GtkConstraintLayout *layout);
GDK_AVAILABLE_IN_ALL
GListModel * gtk_constraint_layout_observe_guides (GtkConstraintLayout *layout);
G_END_DECLS