[gimp] app: implement a select_items() method for GimpContainerComboBox…

[Jehan <jehanp src gnome org>]

commit 1a3dbe2099f63b10f9feca1fa88cd018cdcebdd7
Author: Jehan <jehan girinstud io>
Date:   Thu Jun 10 09:54:22 2021 +0200

    app: implement a select_items() method for GimpContainerComboBox…
    
    … and use gimp_container_view_select_items() when the context changes.
    
    Even though some types of containers still expect only a single
    selected content, we should slowly move to multiple item code. The
    reason is to avoid 2 code paths which makes the code more complicated
    and bug-prone. When all child classes of GimpContainerView will have a
    valid select_items() implementation, we can work on getting rid of the
    select_item() in favor of the multi-item one.

 app/widgets/gimpcontainercombobox.c | 38 +++++++++++++++++++++++++++++++++++++
 app/widgets/gimpcontainerview.c     |  9 ++++++++-
 2 files changed, 46 insertions(+), 1 deletion(-)
---
diff --git a/app/widgets/gimpcontainercombobox.c b/app/widgets/gimpcontainercombobox.c
index d559890b12..16b1ab9fe3 100644
--- a/app/widgets/gimpcontainercombobox.c
+++ b/app/widgets/gimpcontainercombobox.c
@@ -77,6 +77,9 @@ static void     gimp_container_combo_box_rename_item  (GimpContainerView      *v
 static gboolean  gimp_container_combo_box_select_item (GimpContainerView      *view,
                                                        GimpViewable           *viewable,
                                                        gpointer                insert_data);
+static gboolean  gimp_container_combo_box_select_items(GimpContainerView      *view,
+                                                       GList                  *viewables,
+                                                       GList                  *paths);
 static void     gimp_container_combo_box_clear_items  (GimpContainerView      *view);
 static void    gimp_container_combo_box_set_view_size (GimpContainerView      *view);
 
@@ -127,6 +130,7 @@ gimp_container_combo_box_view_iface_init (GimpContainerViewInterface *iface)
   iface->reorder_item  = gimp_container_combo_box_reorder_item;
   iface->rename_item   = gimp_container_combo_box_rename_item;
   iface->select_item   = gimp_container_combo_box_select_item;
+  iface->select_items  = gimp_container_combo_box_select_items;
   iface->clear_items   = gimp_container_combo_box_clear_items;
   iface->set_view_size = gimp_container_combo_box_set_view_size;
 
@@ -380,6 +384,40 @@ gimp_container_combo_box_select_item (GimpContainerView *view,
   return TRUE;
 }
 
+static gboolean
+gimp_container_combo_box_select_items (GimpContainerView *view,
+                                       GList             *viewables,
+                                       GList             *paths)
+{
+  GtkComboBox *combo_box = GTK_COMBO_BOX (view);
+
+  g_return_val_if_fail (GIMP_IS_CONTAINER_VIEW (view), FALSE);
+  /* Only zero or one items may selected in a GimpContainerComboBox. */
+  g_return_val_if_fail (g_list_length (viewables) < 2, FALSE);
+
+  if (gtk_combo_box_get_model (GTK_COMBO_BOX (view)))
+    {
+      g_signal_handlers_block_by_func (combo_box,
+                                       gimp_container_combo_box_changed,
+                                       view);
+
+      if (viewables)
+        {
+          gimp_container_view_item_selected (view, viewables->data);
+        }
+      else
+        {
+          gtk_combo_box_set_active (combo_box, -1);
+        }
+
+      g_signal_handlers_unblock_by_func (combo_box,
+                                         gimp_container_combo_box_changed,
+                                         view);
+    }
+
+  return TRUE;
+}
+
 static void
 gimp_container_combo_box_clear_items (GimpContainerView *view)
 {
diff --git a/app/widgets/gimpcontainerview.c b/app/widgets/gimpcontainerview.c
index eac2c20020..e6a8441f06 100644
--- a/app/widgets/gimpcontainerview.c
+++ b/app/widgets/gimpcontainerview.c
@@ -1383,8 +1383,15 @@ gimp_container_view_context_changed (GimpContext       *context,
                                      GimpViewable      *viewable,
                                      GimpContainerView *view)
 {
-  if (! gimp_container_view_select_item (view, viewable))
+  GList *viewables = NULL;
+
+  if (viewable)
+    viewables = g_list_prepend (viewables, viewable);
+
+  if (! gimp_container_view_select_items (view, viewables))
     g_warning ("%s: select_item() failed (should not happen)", G_STRFUNC);
+
+  g_list_free (viewables);
 }
 
 static void