[tepl/wip/tepl-next: 2/2] Add undo/redo GActions and AmtkActionInfos

[Sébastien Wilmet <swilmet src gnome org>]

commit c83da3294f41529233f6650c8c7ecdc8b0df24d8
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Aug 19 17:02:10 2017 +0200

    Add undo/redo GActions and AmtkActionInfos

 tepl/tepl-application-window.c |  113 ++++++++++++++++++++++++++++++++++++++++
 tepl/tepl-application.c        |    6 ++
 2 files changed, 119 insertions(+), 0 deletions(-)
---
diff --git a/tepl/tepl-application-window.c b/tepl/tepl-application-window.c
index 6b8f8b6..79bd6f4 100644
--- a/tepl/tepl-application-window.c
+++ b/tepl/tepl-application-window.c
@@ -52,6 +52,9 @@
  *
  * ## For the Edit menu
  *
+ * - `"win.tepl-undo"`: calls gtk_source_buffer_undo() on the active buffer.
+ * - `"win.tepl-redo"`: calls gtk_source_buffer_redo() on the active buffer.
+ *
  * The following actions require the %AMTK_FACTORY_IGNORE_ACCELS_FOR_APP flag,
  * because otherwise accelerators don't work in other text widgets than the
  * active view (e.g. in a #GtkEntry):
@@ -110,6 +113,50 @@ new_file_cb (GSimpleAction *action,
 }
 
 static void
+undo_cb (GSimpleAction *action,
+        GVariant      *parameter,
+        gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+       TeplView *view;
+
+       view = tepl_tab_group_get_active_view (TEPL_TAB_GROUP (tepl_window));
+
+       if (view != NULL)
+       {
+               TeplBuffer *buffer;
+
+               buffer = tepl_tab_group_get_active_buffer (TEPL_TAB_GROUP (tepl_window));
+
+               gtk_source_buffer_undo (GTK_SOURCE_BUFFER (buffer));
+               tepl_view_scroll_to_cursor (view);
+               gtk_widget_grab_focus (GTK_WIDGET (view));
+       }
+}
+
+static void
+redo_cb (GSimpleAction *action,
+        GVariant      *parameter,
+        gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+       TeplView *view;
+
+       view = tepl_tab_group_get_active_view (TEPL_TAB_GROUP (tepl_window));
+
+       if (view != NULL)
+       {
+               TeplBuffer *buffer;
+
+               buffer = tepl_tab_group_get_active_buffer (TEPL_TAB_GROUP (tepl_window));
+
+               gtk_source_buffer_redo (GTK_SOURCE_BUFFER (buffer));
+               tepl_view_scroll_to_cursor (view);
+               gtk_widget_grab_focus (GTK_WIDGET (view));
+       }
+}
+
+static void
 cut_cb (GSimpleAction *action,
        GVariant      *parameter,
        gpointer       user_data)
@@ -189,6 +236,38 @@ select_all_cb (GSimpleAction *action,
        }
 }
 
+static void
+update_undo_redo_actions_sensitivity (TeplApplicationWindow *tepl_window)
+{
+       TeplView *view;
+       gboolean view_is_editable = FALSE;
+       GtkSourceBuffer *buffer;
+       GActionMap *action_map;
+       GAction *action;
+
+       view = tepl_tab_group_get_active_view (TEPL_TAB_GROUP (tepl_window));
+       if (view != NULL)
+       {
+               view_is_editable = gtk_text_view_get_editable (GTK_TEXT_VIEW (view));
+       }
+
+       buffer = GTK_SOURCE_BUFFER (tepl_tab_group_get_active_buffer (TEPL_TAB_GROUP (tepl_window)));
+
+       action_map = G_ACTION_MAP (tepl_window->priv->gtk_window);
+
+       action = g_action_map_lookup_action (action_map, "tepl-undo");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    view_is_editable &&
+                                    buffer != NULL &&
+                                    gtk_source_buffer_can_undo (buffer));
+
+       action = g_action_map_lookup_action (action_map, "tepl-redo");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    view_is_editable &&
+                                    buffer != NULL &&
+                                    gtk_source_buffer_can_redo (buffer));
+}
+
 /* @can_paste_according_to_clipboard: TRUE if calling
  * tepl_view_paste_clipboard() will paste something.
  */
@@ -342,6 +421,7 @@ update_basic_edit_actions_sensitivity (TeplApplicationWindow *tepl_window)
 static void
 update_actions_sensitivity (TeplApplicationWindow *tepl_window)
 {
+       update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
        update_paste_action_sensitivity (tepl_window);
 }
@@ -361,6 +441,8 @@ add_actions (TeplApplicationWindow *tepl_window)
                { "tepl-new-file", new_file_cb },
 
                /* Edit menu */
+               { "tepl-undo", undo_cb },
+               { "tepl-redo", redo_cb },
                { "tepl-cut", cut_cb },
                { "tepl-copy", copy_cb },
                { "tepl-paste", paste_cb },
@@ -632,6 +714,7 @@ tepl_application_window_get_application_window (TeplApplicationWindow *tepl_wind
 static void
 active_tab_changed (TeplApplicationWindow *tepl_window)
 {
+       update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
        update_paste_action_sensitivity (tepl_window);
 }
@@ -641,6 +724,7 @@ active_view_editable_notify_cb (GtkTextView           *active_view,
                                GParamSpec            *pspec,
                                TeplApplicationWindow *tepl_window)
 {
+       update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
        update_paste_action_sensitivity (tepl_window);
 }
@@ -676,6 +760,22 @@ active_buffer_has_selection_notify_cb (GtkTextBuffer         *buffer,
 }
 
 static void
+active_buffer_can_undo_notify_cb (GtkSourceBuffer       *buffer,
+                                 GParamSpec            *pspec,
+                                 TeplApplicationWindow *tepl_window)
+{
+       update_undo_redo_actions_sensitivity (tepl_window);
+}
+
+static void
+active_buffer_can_redo_notify_cb (GtkSourceBuffer       *buffer,
+                                 GParamSpec            *pspec,
+                                 TeplApplicationWindow *tepl_window)
+{
+       update_undo_redo_actions_sensitivity (tepl_window);
+}
+
+static void
 active_buffer_changed (TeplApplicationWindow *tepl_window)
 {
        TeplBuffer *active_buffer;
@@ -696,7 +796,20 @@ active_buffer_changed (TeplApplicationWindow *tepl_window)
                                                  G_CALLBACK (active_buffer_has_selection_notify_cb),
                                                  tepl_window));
 
+       _tepl_signal_group_add (tepl_window->priv->buffer_signal_group,
+                               g_signal_connect (active_buffer,
+                                                 "notify::can-undo",
+                                                 G_CALLBACK (active_buffer_can_undo_notify_cb),
+                                                 tepl_window));
+
+       _tepl_signal_group_add (tepl_window->priv->buffer_signal_group,
+                               g_signal_connect (active_buffer,
+                                                 "notify::can-redo",
+                                                 G_CALLBACK (active_buffer_can_redo_notify_cb),
+                                                 tepl_window));
+
 end:
+       update_undo_redo_actions_sensitivity (tepl_window);
        update_basic_edit_actions_sensitivity (tepl_window);
 }
 
diff --git a/tepl/tepl-application.c b/tepl/tepl-application.c
index 5d0a2e7..e199c0f 100644
--- a/tepl/tepl-application.c
+++ b/tepl/tepl-application.c
@@ -73,6 +73,12 @@ init_tepl_action_info_store (TeplApplication *tepl_app)
 
                /* Edit menu */
 
+               { "win.tepl-undo", "edit-undo", N_("_Undo"), "<Control>z",
+                 N_("Undo the last action") },
+
+               { "win.tepl-redo", "edit-redo", N_("_Redo"), "<Shift><Control>z",
+                 N_("Redo the last undone action") },
+
                { "win.tepl-cut", "edit-cut", N_("Cu_t"), "<Control>x",
                  N_("Cut the selection") },