shortcutcontroller: Implement mnemonic cycling

Make GtkShortcutController collect matching shortcuts
in the same way GtkKeyHash did (accept fuzzy matches
if we don't have any exact matches), and cycle among
the matches if we have multiple.

diff --git a/gtk/gtkshortcutcontroller.c b/gtk/gtkshortcutcontroller.c
index 31c12d0195a67e12c1861b1625eece7abf8b42c9..8d2c5f1f35f7488fc57dcadf4a2535916848bedc 100644 (file)
--- a/gtk/gtkshortcutcontroller.c
+++ b/gtk/gtkshortcutcontroller.c
@@ -55,6 +55,8 @@ struct _GtkShortcutController
   GdkModifierType mnemonics_modifiers;
 
   guint custom_shortcuts : 1;
+
+  guint last_activated;
 };
 
 struct _GtkShortcutControllerClass
@@ -238,31 +240,18 @@ gtk_shortcut_controller_finalize (GObject *object)
   G_OBJECT_CLASS (gtk_shortcut_controller_parent_class)->finalize (object);
 }
 
-static gboolean
-gtk_shortcut_controller_trigger_shortcut (GtkShortcutController *self,
-                                          GtkShortcut           *shortcut,
-                                          guint                  position,
-                                          GdkEvent              *event,
-                                          gboolean               enable_mnemonics)
-{
-  GtkWidget *widget;
+typedef struct {
+  GtkShortcut *shortcut;
+  guint index;
+} ShortcutData;
 
-  if (gtk_shortcut_trigger_trigger (gtk_shortcut_get_trigger (shortcut), event, enable_mnemonics) == GTK_SHORTCUT_TRIGGER_MATCH_NONE)
-    return FALSE;
-
-  widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (self));
-  if (!self->custom_shortcuts &&
-      GTK_IS_FLATTEN_LIST_MODEL (self->shortcuts))
-    {
-      GListModel *model = gtk_flatten_list_model_get_model_for_item (GTK_FLATTEN_LIST_MODEL (self->shortcuts), position);
-      if (GTK_IS_SHORTCUT_CONTROLLER (model))
-        widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (model));
-    }
+static void
+shortcut_data_free (gpointer data)
+{
+  ShortcutData *sdata = data;
 
-  return gtk_shortcut_action_activate (gtk_shortcut_get_action (shortcut),
-                                       GTK_SHORTCUT_ACTION_EXCLUSIVE, /* FIXME */
-                                       widget,
-                                       gtk_shortcut_get_arguments (shortcut));
+  g_object_unref (sdata->shortcut);
+  g_free (sdata);
 }
 
 static gboolean
@@ -274,21 +263,79 @@ gtk_shortcut_controller_run_controllers (GtkEventController *controller,
 {
   GtkShortcutController *self = GTK_SHORTCUT_CONTROLLER (controller);
   guint i;
+  GSList *shortcuts = NULL;
+  GSList *l;
+  gboolean has_exact = FALSE;
+  gboolean retval = FALSE;
 
   for (i = 0; i < g_list_model_get_n_items (self->shortcuts); i++)
     {
-      GtkShortcut *shortcut = g_list_model_get_item (self->shortcuts, i);
-      g_object_unref (shortcut);
-
-      if (gtk_shortcut_controller_trigger_shortcut (self, 
-                                                    shortcut,
-                                                    i,
-                                                    event,
-                                                    enable_mnemonics))
-        return TRUE;
+      GtkShortcut *shortcut;
+      ShortcutData *data;
+      guint index;
+
+      index = (self->last_activated + 1 + i) % g_list_model_get_n_items (self->shortcuts);
+      shortcut = g_list_model_get_item (self->shortcuts, index);
+
+      switch (gtk_shortcut_trigger_trigger (gtk_shortcut_get_trigger (shortcut), event, enable_mnemonics))
+        {
+        case GTK_SHORTCUT_TRIGGER_MATCH_PARTIAL:
+          if (!has_exact)
+            break;
+          G_GNUC_FALLTHROUGH;
+
+        case GTK_SHORTCUT_TRIGGER_MATCH_NONE:
+          g_object_unref (shortcut);
+          continue;
+
+        case GTK_SHORTCUT_TRIGGER_MATCH_EXACT:
+          if (!has_exact)
+            {
+              g_slist_free_full (shortcuts, shortcut_data_free);
+              shortcuts = NULL;
+            }
+          has_exact = TRUE;
+          break;
+
+        default:
+          g_assert_not_reached ();
+        }
+
+      data = g_new0 (ShortcutData, 1);
+      data->shortcut = shortcut;
+      data->index = index;
+
+      shortcuts = g_slist_append (shortcuts, data);
+    }
+
+  for (l = shortcuts; l; l = l->next)
+    {
+      ShortcutData *data = l->data;
+      GtkWidget *widget;
+
+      widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (self));
+      if (!self->custom_shortcuts &&
+          GTK_IS_FLATTEN_LIST_MODEL (self->shortcuts))
+        {
+          GListModel *model = gtk_flatten_list_model_get_model_for_item (GTK_FLATTEN_LIST_MODEL (self->shortcuts), data->index);
+          if (GTK_IS_SHORTCUT_CONTROLLER (model))
+            widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (model));
+        }
+
+      if (gtk_shortcut_action_activate (gtk_shortcut_get_action (data->shortcut),
+                                        shortcuts->next == NULL ? GTK_SHORTCUT_ACTION_EXCLUSIVE : 0,
+                                        widget,
+                                        gtk_shortcut_get_arguments (data->shortcut)))
+        {
+          self->last_activated = data->index;
+          retval = TRUE;
+          break;
+        }
     }
 
-  return FALSE;
+  g_slist_free_full (shortcuts, shortcut_data_free);
+
+  return retval;
 }
 
 static gboolean