[tepl] LanguageChooserWidget: handle scrolling to selected rows

[Sébastien Wilmet <swilmet src gnome org>]

commit bce351b92dff0cd9d0f18c463bf88e28827bb004
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Nov 4 22:26:21 2020 +0100

    LanguageChooserWidget: handle scrolling to selected rows

 tepl/tepl-language-chooser-widget.c | 40 ++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)
---
diff --git a/tepl/tepl-language-chooser-widget.c b/tepl/tepl-language-chooser-widget.c
index 4e02cf1..4b0d3b7 100644
--- a/tepl/tepl-language-chooser-widget.c
+++ b/tepl/tepl-language-chooser-widget.c
@@ -48,6 +48,11 @@ list_box_select_first_row (GtkListBox           *list_box,
 
        row = tepl_utils_list_box_get_row_at_index_with_filter (list_box, 0, filter_func, user_data);
        gtk_list_box_select_row (list_box, row);
+
+       if (row != NULL)
+       {
+               tepl_utils_list_box_scroll_to_row (list_box, row);
+       }
 }
 
 static void
@@ -97,12 +102,28 @@ tepl_language_chooser_widget_dispose (GObject *object)
        G_OBJECT_CLASS (tepl_language_chooser_widget_parent_class)->dispose (object);
 }
 
+static void
+tepl_language_chooser_widget_map (GtkWidget *widget)
+{
+       TeplLanguageChooserWidget *chooser_widget = TEPL_LANGUAGE_CHOOSER_WIDGET (widget);
+
+       if (GTK_WIDGET_CLASS (tepl_language_chooser_widget_parent_class)->map != NULL)
+       {
+               GTK_WIDGET_CLASS (tepl_language_chooser_widget_parent_class)->map (widget);
+       }
+
+       tepl_utils_list_box_scroll_to_selected_row (chooser_widget->priv->list_box);
+}
+
 static void
 tepl_language_chooser_widget_class_init (TeplLanguageChooserWidgetClass *klass)
 {
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
+       GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
        object_class->dispose = tepl_language_chooser_widget_dispose;
+
+       widget_class->map = tepl_language_chooser_widget_map;
 }
 
 static void
@@ -124,6 +145,7 @@ tepl_language_chooser_widget_select_language (TeplLanguageChooser *chooser,
                if (cur_language == language)
                {
                        gtk_list_box_select_row (chooser_widget->priv->list_box, cur_row);
+                       tepl_utils_list_box_scroll_to_row (chooser_widget->priv->list_box, cur_row);
                        break;
                }
        }
@@ -363,6 +385,7 @@ move_selection (TeplLanguageChooserWidget *chooser_widget,
        new_row_to_select_pos = CLAMP (new_row_to_select_pos, 0, n_filtered_children - 1);
        new_row_to_select = filtered_children[new_row_to_select_pos];
        gtk_list_box_select_row (chooser_widget->priv->list_box, new_row_to_select);
+       tepl_utils_list_box_scroll_to_row (chooser_widget->priv->list_box, new_row_to_select);
 
 out:
        g_free (filtered_children);
@@ -400,32 +423,39 @@ search_entry_key_press_event_cb (GtkWidget                 *search_entry,
 static void
 tepl_language_chooser_widget_init (TeplLanguageChooserWidget *chooser_widget)
 {
-       GtkWidget *scrolled_window;
+       GtkScrolledWindow *scrolled_window;
 
        chooser_widget->priv = tepl_language_chooser_widget_get_instance_private (chooser_widget);
 
+       /* chooser_widget config */
        gtk_orientable_set_orientation (GTK_ORIENTABLE (chooser_widget), GTK_ORIENTATION_VERTICAL);
        gtk_widget_set_size_request (GTK_WIDGET (chooser_widget), 300, 400);
        gtk_grid_set_row_spacing (GTK_GRID (chooser_widget), 3);
        gtk_container_set_border_width (GTK_CONTAINER (chooser_widget), 6);
 
+       /* GtkSearchEntry */
        chooser_widget->priv->search_entry = GTK_SEARCH_ENTRY (gtk_search_entry_new ());
        gtk_entry_set_placeholder_text (GTK_ENTRY (chooser_widget->priv->search_entry),
                                        _("Search highlight mode…"));
        gtk_widget_show (GTK_WIDGET (chooser_widget->priv->search_entry));
        gtk_container_add (GTK_CONTAINER (chooser_widget), GTK_WIDGET (chooser_widget->priv->search_entry));
 
+       /* GtkListBox */
        chooser_widget->priv->list_box = GTK_LIST_BOX (gtk_list_box_new ());
        gtk_list_box_set_activate_on_single_click (chooser_widget->priv->list_box, FALSE);
        gtk_widget_set_hexpand (GTK_WIDGET (chooser_widget->priv->list_box), TRUE);
        gtk_widget_set_vexpand (GTK_WIDGET (chooser_widget->priv->list_box), TRUE);
        populate_list_box (chooser_widget);
 
-       scrolled_window = gtk_scrolled_window_new (NULL, NULL);
-       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_IN);
+       /* GtkScrolledWindow */
+       scrolled_window = GTK_SCROLLED_WINDOW (gtk_scrolled_window_new (NULL, NULL));
+       gtk_scrolled_window_set_shadow_type (scrolled_window, GTK_SHADOW_IN);
+
        gtk_container_add (GTK_CONTAINER (scrolled_window), GTK_WIDGET (chooser_widget->priv->list_box));
-       gtk_widget_show_all (scrolled_window);
-       gtk_container_add (GTK_CONTAINER (chooser_widget), scrolled_window);
+       gtk_widget_show_all (GTK_WIDGET (scrolled_window));
+       gtk_container_add (GTK_CONTAINER (chooser_widget), GTK_WIDGET (scrolled_window));
+
+       tepl_utils_list_box_setup_scrolling (chooser_widget->priv->list_box, scrolled_window);
 
        gtk_list_box_set_filter_func (chooser_widget->priv->list_box,
                                      filter_cb,