[gtksourceview/wip/chergert/gsv-gtk4: 221/259] words: implement filtering with GtkFilterListModel

[Christian Hergert <chergert src gnome org>]

commit d1cf4cea60a483b720b87222daed19331d0cff1f
Author: Christian Hergert <chergert redhat com>
Date:   Tue Sep 1 16:10:38 2020 -0700

    words: implement filtering with GtkFilterListModel

 .../words/gtksourcecompletionwords.c               | 40 ++++++++++++++++++++++
 .../words/gtksourcecompletionwordsproposal.c       | 37 ++++++++++++++++++++
 2 files changed, 77 insertions(+)
---
diff --git a/gtksourceview/completion-providers/words/gtksourcecompletionwords.c 
b/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
index 21e91c71..017fcbf9 100644
--- a/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
+++ b/gtksourceview/completion-providers/words/gtksourcecompletionwords.c
@@ -498,6 +498,45 @@ gtk_source_completion_words_activate (GtkSourceCompletionProvider *provider,
        }
 }
 
+static void
+gtk_source_completion_words_refilter (GtkSourceCompletionProvider *provider,
+                                      GtkSourceCompletionContext  *context,
+                                      GListModel                  *model)
+{
+       GtkFilterListModel *filter_model;
+       GtkExpression *expression;
+       GtkFilter *filter;
+       gchar *word;
+
+       g_assert (GTK_SOURCE_IS_COMPLETION_PROVIDER (provider));
+       g_assert (GTK_SOURCE_IS_COMPLETION_CONTEXT (context));
+       g_assert (G_IS_LIST_MODEL (model));
+
+       word = gtk_source_completion_context_get_word (context);
+
+       if (GTK_IS_FILTER_LIST_MODEL (model))
+       {
+               model = gtk_filter_list_model_get_model (GTK_FILTER_LIST_MODEL (model));
+       }
+
+       if (!word || !word[0])
+       {
+               gtk_source_completion_context_set_proposals_for_provider (context, provider, model);
+               g_free (word);
+               return;
+       }
+
+       expression = gtk_property_expression_new (GTK_SOURCE_TYPE_COMPLETION_WORDS_PROPOSAL, NULL, "word");
+       filter = gtk_string_filter_new (g_steal_pointer (&expression));
+       gtk_string_filter_set_search (GTK_STRING_FILTER (filter), word);
+       filter_model = gtk_filter_list_model_new (g_object_ref (model), g_steal_pointer (&filter));
+       gtk_filter_list_model_set_incremental (filter_model, TRUE);
+       gtk_source_completion_context_set_proposals_for_provider (context, provider, G_LIST_MODEL 
(filter_model));
+
+       g_clear_object (&filter_model);
+       g_free (word);
+}
+
 static void
 gtk_source_completion_words_iface_init (GtkSourceCompletionProviderInterface *iface)
 {
@@ -507,6 +546,7 @@ gtk_source_completion_words_iface_init (GtkSourceCompletionProviderInterface *if
        iface->get_priority = gtk_source_completion_words_get_priority;
        iface->display = gtk_source_completion_words_display;
        iface->activate = gtk_source_completion_words_activate;
+       iface->refilter = gtk_source_completion_words_refilter;
 }
 
 static void
diff --git a/gtksourceview/completion-providers/words/gtksourcecompletionwordsproposal.c 
b/gtksourceview/completion-providers/words/gtksourcecompletionwordsproposal.c
index 5f88571f..bb394e18 100644
--- a/gtksourceview/completion-providers/words/gtksourcecompletionwordsproposal.c
+++ b/gtksourceview/completion-providers/words/gtksourcecompletionwordsproposal.c
@@ -35,6 +35,14 @@ enum
        N_SIGNALS
 };
 
+enum
+{
+       PROP_0,
+       PROP_WORD,
+       N_PROPS
+};
+
+static GParamSpec *properties[N_PROPS];
 static guint signals[N_SIGNALS];
 
 G_DEFINE_TYPE_WITH_CODE (GtkSourceCompletionWordsProposal,
@@ -53,12 +61,41 @@ gtk_source_completion_words_proposal_finalize (GObject *object)
        G_OBJECT_CLASS (gtk_source_completion_words_proposal_parent_class)->finalize (object);
 }
 
+static void
+gtk_source_completion_words_proposal_get_property (GObject    *object,
+                                                   guint       prop_id,
+                                                   GValue     *value,
+                                                   GParamSpec *pspec)
+{
+       GtkSourceCompletionWordsProposal *self = GTK_SOURCE_COMPLETION_WORDS_PROPOSAL (object);
+
+       switch (prop_id)
+       {
+       case PROP_WORD:
+               g_value_set_string (value, self->word);
+               break;
+
+       default:
+               G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+       }
+}
+
 static void
 gtk_source_completion_words_proposal_class_init (GtkSourceCompletionWordsProposalClass *klass)
 {
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
        object_class->finalize = gtk_source_completion_words_proposal_finalize;
+       object_class->get_property = gtk_source_completion_words_proposal_get_property;
+
+       properties [PROP_WORD] =
+               g_param_spec_string ("word",
+                                    "Word",
+                                    "The word for the proposal",
+                                    NULL,
+                                    (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
+       g_object_class_install_properties (object_class, N_PROPS, properties);
 
        signals[UNUSED] =
                g_signal_new ("unused",