[tepl] App/AppWindow: add win.tepl-goto-line GAction

[Sébastien Wilmet <swilmet src gnome org>]

commit a184fdd5b7324e6c13924963e0e42cc61ef54922
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Apr 24 19:45:31 2020 +0200

    App/AppWindow: add win.tepl-goto-line GAction

 tepl/tepl-application-window.c | 100 ++++++++++++++++++++++++++++++++++++++++-
 tepl/tepl-application.c        |   7 ++-
 2 files changed, 105 insertions(+), 2 deletions(-)
---
diff --git a/tepl/tepl-application-window.c b/tepl/tepl-application-window.c
index 24ba393..93c6c01 100644
--- a/tepl/tepl-application-window.c
+++ b/tepl/tepl-application-window.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of Tepl, a text editor library.
  *
- * Copyright 2017 - Sébastien Wilmet <swilmet gnome org>
+ * Copyright 2017-2020 - Sébastien Wilmet <swilmet gnome org>
  *
  * Tepl is free software; you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License as published by the
@@ -77,6 +77,19 @@
  *   selected text of the active view.
  *
  * See the tepl_menu_shell_append_edit_actions() convenience function.
+ *
+ * ## For the Search menu
+ *
+ * - `"win.tepl-goto-line"`: shows the #TeplGotoLineBar of all #TeplTab's
+ *   belonging to #TeplApplicationWindow. Even though each #TeplTab has a
+ *   different #TeplGotoLineBar, all #TeplGotoLineBar's of the #TeplTabGroup
+ *   have their #GtkWidget:visible state synchronized, so when one
+ *   #TeplGotoLineBar is hidden, all the other #TeplGotoLineBar's are hidden as
+ *   well. The user may think that there is only one #TeplGotoLineBar per
+ *   window, with the #TeplGotoLineBar remembering a different state (mainly the
+ *   content of the #GtkSearchEntry) for each #TeplTab. To remember the state
+ *   for each #TeplTab, the easiest is to have a different widget for each
+ *   #TeplTab, hence the current implementation.
  */
 
 struct _TeplApplicationWindowPrivate
@@ -409,6 +422,86 @@ unindent_cb (GSimpleAction *action,
        }
 }
 
+static void
+update_goto_line_action_sensitivity (TeplApplicationWindow *tepl_window)
+{
+       TeplTab *active_tab;
+       GActionMap *action_map;
+       GAction *action;
+
+       active_tab = tepl_tab_group_get_active_tab (TEPL_TAB_GROUP (tepl_window));
+
+       action_map = G_ACTION_MAP (tepl_window->priv->gtk_window);
+
+       action = g_action_map_lookup_action (action_map, "tepl-goto-line");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    active_tab != NULL);
+}
+
+static void
+update_goto_line (TeplApplicationWindow *tepl_window)
+{
+       GActionMap *action_map;
+       GAction *goto_line_action;
+       TeplTab *active_tab;
+       TeplGotoLineBar *goto_line_bar;
+
+       update_goto_line_action_sensitivity (tepl_window);
+
+       action_map = G_ACTION_MAP (tepl_window->priv->gtk_window);
+       goto_line_action = g_action_map_lookup_action (action_map, "tepl-goto-line");
+
+       active_tab = tepl_tab_group_get_active_tab (TEPL_TAB_GROUP (tepl_window));
+       if (active_tab == NULL)
+       {
+               /* FIXME: should be done when the TeplTabGroup is *empty*. When
+                * the active_tab == NULL it's an approximation. More APIs need
+                * to be added to TeplTabGroup.
+                */
+               g_simple_action_set_state (G_SIMPLE_ACTION (goto_line_action),
+                                          g_variant_new_boolean (FALSE));
+               return;
+       }
+
+       /* FIXME: would be nice to call
+        * _tepl_goto_line_bar_bind_to_gaction_state() directly for all
+        * TeplTab's, when they are added to the TeplTabGroup.
+        */
+       goto_line_bar = tepl_tab_get_goto_line_bar (active_tab);
+       _tepl_goto_line_bar_bind_to_gaction_state (goto_line_bar, goto_line_action);
+}
+
+static void
+goto_line_activate_cb (GSimpleAction *action,
+                      GVariant      *parameter,
+                      gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+       TeplTab *active_tab;
+
+       g_action_change_state (G_ACTION (action), g_variant_new_boolean (TRUE));
+
+       active_tab = tepl_tab_group_get_active_tab (TEPL_TAB_GROUP (tepl_window));
+       if (active_tab != NULL)
+       {
+               TeplGotoLineBar *goto_line_bar;
+
+               goto_line_bar = tepl_tab_get_goto_line_bar (active_tab);
+               tepl_goto_line_bar_grab_focus_to_entry (goto_line_bar);
+       }
+}
+
+static void
+goto_line_change_state_cb (GSimpleAction *action,
+                          GVariant      *value,
+                          gpointer       user_data)
+{
+       TeplApplicationWindow *tepl_window = TEPL_APPLICATION_WINDOW (user_data);
+
+       g_simple_action_set_state (action, value);
+       update_goto_line (tepl_window);
+}
+
 static void
 update_save_actions_sensitivity (TeplApplicationWindow *tepl_window)
 {
@@ -626,6 +719,7 @@ 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);
+       update_goto_line_action_sensitivity (tepl_window);
 }
 
 static void
@@ -655,6 +749,9 @@ add_actions (TeplApplicationWindow *tepl_window)
                { "tepl-select-all", select_all_cb },
                { "tepl-indent", indent_cb },
                { "tepl-unindent", unindent_cb },
+
+               /* Search menu */
+               { "tepl-goto-line", goto_line_activate_cb, NULL, "false", goto_line_change_state_cb },
        };
 
        amtk_action_map_add_action_entries_check_dups (G_ACTION_MAP (tepl_window->priv->gtk_window),
@@ -1021,6 +1118,7 @@ active_tab_changed (TeplApplicationWindow *tepl_window)
        update_basic_edit_actions_sensitivity (tepl_window);
        update_paste_action_sensitivity (tepl_window);
 
+       update_goto_line (tepl_window);
        update_title (tepl_window);
 }
 
diff --git a/tepl/tepl-application.c b/tepl/tepl-application.c
index edbb1ca..8d6ce02 100644
--- a/tepl/tepl-application.c
+++ b/tepl/tepl-application.c
@@ -1,7 +1,7 @@
 /*
  * This file is part of Tepl, a text editor library.
  *
- * Copyright 2017 - Sébastien Wilmet <swilmet gnome org>
+ * Copyright 2017-2020 - Sébastien Wilmet <swilmet gnome org>
  *
  * Tepl is free software; you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License as published by the
@@ -134,6 +134,11 @@ init_tepl_action_info_store (TeplApplication *tepl_app)
 
                { "win.tepl-unindent", "format-indent-less", N_("_Unindent"), "<Shift>Tab",
                  N_("Unindent the selected lines") },
+
+               /* Search menu */
+
+               { "win.tepl-goto-line", "go-jump", N_("_Go to Line…"), "<Control>l",
+                 N_("Go to a specific line") },
        };
 
        g_assert (tepl_app->priv->tepl_action_info_store == NULL);