[gimp] Bug 785061 - Add channels-select-(prev|next|top|bottom) actions.

[Jehan Pagès <jehanp src gnome org>]

commit 1e87642ef094b80a57d421fd3c72902fc1fff0a3
Author: Jehan <jehan girinstud io>
Date:   Thu Nov 16 01:26:19 2017 +0100

    Bug 785061 - Add channels-select-(prev|next|top|bottom) actions.

 app/actions/channels-actions.c  |   37 +++++++++++++++++++++++++++++++++++++
 app/actions/channels-commands.c |   22 ++++++++++++++++++++++
 app/actions/channels-commands.h |    4 ++++
 app/widgets/gimphelp-ids.h      |    4 ++++
 4 files changed, 67 insertions(+), 0 deletions(-)
---
diff --git a/app/actions/channels-actions.c b/app/actions/channels-actions.c
index 63a126a..4d9dcaf 100644
--- a/app/actions/channels-actions.c
+++ b/app/actions/channels-actions.c
@@ -218,6 +218,33 @@ static const GimpEnumActionEntry channels_to_selection_actions[] =
     GIMP_HELP_CHANNEL_SELECTION_INTERSECT }
 };
 
+static const GimpEnumActionEntry channels_select_actions[] =
+{
+  { "channels-select-top", NULL,
+    NC_("channels-action", "Select _Top Channel"), NULL,
+    NC_("channels-action", "Select the topmost channel"),
+    GIMP_ACTION_SELECT_FIRST, FALSE,
+    GIMP_HELP_CHANNEL_TOP },
+
+  { "channels-select-bottom", NULL,
+    NC_("channels-action", "Select _Bottom Channel"), NULL,
+    NC_("channels-action", "Select the bottommost channel"),
+    GIMP_ACTION_SELECT_LAST, FALSE,
+    GIMP_HELP_CHANNEL_BOTTOM },
+
+  { "channels-select-previous", NULL,
+    NC_("channels-action", "Select _Previous Channel"), NULL,
+    NC_("channels-action", "Select the channel above the current channel"),
+    GIMP_ACTION_SELECT_PREVIOUS, FALSE,
+    GIMP_HELP_CHANNEL_PREVIOUS },
+
+  { "channels-select-next", NULL,
+    NC_("channels-action", "Select _Next Channel"), NULL,
+    NC_("channels-action", "Select the channel below the current channel"),
+    GIMP_ACTION_SELECT_NEXT, FALSE,
+    GIMP_HELP_CHANNEL_NEXT }
+};
+
 
 void
 channels_actions_setup (GimpActionGroup *group)
@@ -240,6 +267,11 @@ channels_actions_setup (GimpActionGroup *group)
                                       G_N_ELEMENTS (channels_to_selection_actions),
                                       G_CALLBACK (channels_to_selection_cmd_callback));
 
+  gimp_action_group_add_enum_actions (group, "channels-action",
+                                      channels_select_actions,
+                                      G_N_ELEMENTS (channels_select_actions),
+                                      G_CALLBACK (channels_select_cmd_callback));
+
   items_actions_setup (group, "channels");
 }
 
@@ -305,6 +337,11 @@ channels_actions_update (GimpActionGroup *group,
   SET_SENSITIVE ("channels-selection-subtract",  !fs && (channel || component));
   SET_SENSITIVE ("channels-selection-intersect", !fs && (channel || component));
 
+  SET_SENSITIVE ("channels-select-top",      !fs && channel && prev);
+  SET_SENSITIVE ("channels-select-bottom",   !fs && channel && next);
+  SET_SENSITIVE ("channels-select-previous", !fs && channel && prev);
+  SET_SENSITIVE ("channels-select-next",     !fs && channel && next);
+
 #undef SET_SENSITIVE
 
   items_actions_update (group, "channels", GIMP_ITEM (channel));
diff --git a/app/actions/channels-commands.c b/app/actions/channels-commands.c
index 3d4e89e..734cb75 100644
--- a/app/actions/channels-commands.c
+++ b/app/actions/channels-commands.c
@@ -424,6 +424,28 @@ channels_color_tag_cmd_callback (GtkAction *action,
                                 (GimpColorTag) value);
 }
 
+void
+channels_select_cmd_callback (GtkAction *action,
+                              gint       value,
+                              gpointer   data)
+{
+  GimpImage      *image;
+  GimpChannel    *channel;
+  GimpChannel    *channel2;
+  GimpContainer  *container;
+  return_if_no_channel (image, channel, data);
+
+  container = gimp_image_get_channels (image);
+  channel2 = (GimpChannel *) action_select_object ((GimpActionSelectType) value,
+                                                   container,
+                                                   (GimpObject *) channel);
+
+  if (channel2 && channel2 != channel)
+    {
+      gimp_image_set_active_channel (image, channel2);
+      gimp_image_flush (image);
+    }
+}
 
 /*  private functions  */
 
diff --git a/app/actions/channels-commands.h b/app/actions/channels-commands.h
index f88ff92..3b57f72 100644
--- a/app/actions/channels-commands.h
+++ b/app/actions/channels-commands.h
@@ -56,5 +56,9 @@ void   channels_color_tag_cmd_callback       (GtkAction   *action,
                                               gint         value,
                                               gpointer     data);
 
+void   channels_select_cmd_callback          (GtkAction   *action,
+                                              gint         value,
+                                              gpointer     data);
+
 
 #endif /* __CHANNELS_COMMANDS_H__ */
diff --git a/app/widgets/gimphelp-ids.h b/app/widgets/gimphelp-ids.h
index 174546b..9238406 100644
--- a/app/widgets/gimphelp-ids.h
+++ b/app/widgets/gimphelp-ids.h
@@ -233,6 +233,10 @@
 #define GIMP_HELP_CHANNEL_LOWER_TO_BOTTOM         "gimp-channel-lower-to-bottom"
 #define GIMP_HELP_CHANNEL_DUPLICATE               "gimp-channel-duplicate"
 #define GIMP_HELP_CHANNEL_DELETE                  "gimp-channel-delete"
+#define GIMP_HELP_CHANNEL_PREVIOUS                "gimp-channel-previous"
+#define GIMP_HELP_CHANNEL_NEXT                    "gimp-channel-next"
+#define GIMP_HELP_CHANNEL_TOP                     "gimp-channel-top"
+#define GIMP_HELP_CHANNEL_BOTTOM                  "gimp-channel-bottom"
 #define GIMP_HELP_CHANNEL_VISIBLE                 "gimp-channel-visible"
 #define GIMP_HELP_CHANNEL_LINKED                  "gimp-channel-linked"
 #define GIMP_HELP_CHANNEL_COLOR_TAG               "gimp-channel-color-tag"