[gnome-builder] libide/tweaks: implement navigation.back action

[Christian Hergert <chergert src gnome org>]

commit ec3f2bfd9cc120876bc283e317a7b7d5c1f795bb
Author: Christian Hergert <chergert redhat com>
Date:   Wed Aug 3 10:18:08 2022 -0700

    libide/tweaks: implement navigation.back action

 src/libide/tweaks/ide-tweaks-window.c | 89 +++++++++++++++++++++++++++++++++++
 src/libide/tweaks/ide-tweaks-window.h | 14 +++---
 2 files changed, 97 insertions(+), 6 deletions(-)
---
diff --git a/src/libide/tweaks/ide-tweaks-window.c b/src/libide/tweaks/ide-tweaks-window.c
index 9015fa98e..087788bb5 100644
--- a/src/libide/tweaks/ide-tweaks-window.c
+++ b/src/libide/tweaks/ide-tweaks-window.c
@@ -62,6 +62,25 @@ ide_tweaks_window_get_current_page (IdeTweaksWindow *self)
   return NULL;
 }
 
+static void
+ide_tweaks_window_update_actions (IdeTweaksWindow *self)
+{
+  GtkWidget *visible_child;
+  gboolean navigate_back_enabled = FALSE;
+
+  g_assert (IDE_IS_TWEAKS_WINDOW (self));
+
+  if ((visible_child = gtk_stack_get_visible_child (self->panel_list_stack)))
+    {
+      IdeTweaksPanelList *list = IDE_TWEAKS_PANEL_LIST (visible_child);
+      IdeTweaksItem *item = ide_tweaks_panel_list_get_item (list);
+
+      navigate_back_enabled = !IDE_IS_TWEAKS (item);
+    }
+
+  gtk_widget_action_set_enabled (GTK_WIDGET (self), "navigation.back", navigate_back_enabled);
+}
+
 static void
 ide_tweaks_window_page_activated_cb (IdeTweaksWindow    *self,
                                      IdeTweaksPage      *page,
@@ -106,6 +125,8 @@ ide_tweaks_window_page_activated_cb (IdeTweaksWindow    *self,
                            sublist,
                            ide_tweaks_item_get_id (IDE_TWEAKS_ITEM (page)));
       gtk_stack_set_visible_child (self->panel_list_stack, sublist);
+
+      ide_tweaks_window_update_actions (self);
     }
 }
 
@@ -142,6 +163,8 @@ ide_tweaks_window_rebuild (IdeTweaksWindow *self)
                        list,
                        ide_tweaks_item_get_id (IDE_TWEAKS_ITEM (self->tweaks)));
   ide_tweaks_panel_list_select_first (IDE_TWEAKS_PANEL_LIST (list));
+
+  ide_tweaks_window_update_actions (self);
 }
 
 static void
@@ -181,6 +204,14 @@ panel_stack_notify_transition_running_cb (IdeTweaksWindow *self,
     }
 }
 
+static void
+ide_tweaks_window_navigate_back_action (GtkWidget  *widget,
+                                        const char *action_name,
+                                        GVariant   *param)
+{
+  ide_tweaks_window_navigate_back (IDE_TWEAKS_WINDOW (widget));
+}
+
 static void
 ide_tweaks_window_dispose (GObject *object)
 {
@@ -255,6 +286,8 @@ ide_tweaks_window_class_init (IdeTweaksWindowClass *klass)
   gtk_widget_class_bind_template_child (widget_class, IdeTweaksWindow, panel_list_stack);
   gtk_widget_class_bind_template_callback (widget_class, panel_stack_notify_transition_running_cb);
 
+  gtk_widget_class_install_action (widget_class, "navigation.back", NULL, 
ide_tweaks_window_navigate_back_action);
+
   g_type_ensure (IDE_TYPE_TWEAKS_PANEL);
   g_type_ensure (IDE_TYPE_TWEAKS_PANEL_LIST);
 }
@@ -263,6 +296,8 @@ static void
 ide_tweaks_window_init (IdeTweaksWindow *self)
 {
   gtk_widget_init_template (GTK_WIDGET (self));
+
+  gtk_widget_action_set_enabled (GTK_WIDGET (self), "navigation.back", FALSE);
 }
 
 GtkWidget *
@@ -343,3 +378,57 @@ ide_tweaks_window_navigate_to (IdeTweaksWindow *self,
     return;
 
 }
+
+static IdeTweaksPanelList *
+ide_tweaks_window_find_list_for_item (IdeTweaksWindow *self,
+                                      IdeTweaksItem   *item)
+{
+  GListModel *model;
+  guint n_items;
+
+  g_assert (IDE_IS_TWEAKS_WINDOW (self));
+  g_assert (IDE_IS_TWEAKS_ITEM (item));
+
+  model = G_LIST_MODEL (gtk_stack_get_pages (GTK_STACK (self->panel_list_stack)));
+  n_items = g_list_model_get_n_items (model);
+
+  for (guint i = 0; i < n_items; i++)
+    {
+      g_autoptr(GtkStackPage) page = g_list_model_get_item (model, i);
+      IdeTweaksPanelList *list = IDE_TWEAKS_PANEL_LIST (gtk_stack_page_get_child (page));
+      IdeTweaksItem *list_item = ide_tweaks_panel_list_get_item (list);
+
+      if (item == list_item)
+        return list;
+    }
+
+  return NULL;
+}
+
+void
+ide_tweaks_window_navigate_back (IdeTweaksWindow *self)
+{
+  IdeTweaksPanelList *list;
+  IdeTweaksItem *item;
+  GtkWidget *visible_child;
+
+  g_return_if_fail (IDE_IS_TWEAKS_WINDOW (self));
+
+  if (!(visible_child = gtk_stack_get_visible_child (self->panel_list_stack)))
+    g_return_if_reached ();
+
+  list = IDE_TWEAKS_PANEL_LIST (visible_child);
+  item = ide_tweaks_panel_list_get_item (list);
+
+  while ((item = ide_tweaks_item_get_parent (item)))
+    {
+      if ((list = ide_tweaks_window_find_list_for_item (self, item)))
+        {
+          gtk_stack_set_visible_child (self->panel_list_stack, GTK_WIDGET (list));
+          ide_tweaks_window_update_actions (self);
+          return;
+        }
+    }
+
+  g_warning ("Failed to lcoate parent panel list");
+}
diff --git a/src/libide/tweaks/ide-tweaks-window.h b/src/libide/tweaks/ide-tweaks-window.h
index 4bb96360b..8fe4b869d 100644
--- a/src/libide/tweaks/ide-tweaks-window.h
+++ b/src/libide/tweaks/ide-tweaks-window.h
@@ -36,14 +36,16 @@ IDE_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (IdeTweaksWindow, ide_tweaks_window, IDE, TWEAKS_WINDOW, AdwWindow)
 
 IDE_AVAILABLE_IN_ALL
-GtkWidget *ide_tweaks_window_new         (void);
+GtkWidget *ide_tweaks_window_new           (void);
 IDE_AVAILABLE_IN_ALL
-IdeTweaks *ide_tweaks_window_get_tweaks  (IdeTweaksWindow *self);
+IdeTweaks *ide_tweaks_window_get_tweaks    (IdeTweaksWindow *self);
 IDE_AVAILABLE_IN_ALL
-void       ide_tweaks_window_set_tweaks  (IdeTweaksWindow *self,
-                                          IdeTweaks       *tweaks);
+void       ide_tweaks_window_set_tweaks    (IdeTweaksWindow *self,
+                                            IdeTweaks       *tweaks);
 IDE_AVAILABLE_IN_ALL
-void       ide_tweaks_window_navigate_to (IdeTweaksWindow *self,
-                                          IdeTweaksItem   *item);
+void       ide_tweaks_window_navigate_to   (IdeTweaksWindow *self,
+                                            IdeTweaksItem   *item);
+IDE_AVAILABLE_IN_ALL
+void       ide_tweaks_window_navigate_back (IdeTweaksWindow *self);
 
 G_END_DECLS