[gtk/wip/otte/listview: 8/23] listitemmanager: Allow properties assigned to trackers

[Benjamin Otte <otte src gnome org>]

commit 4a50cb914b3c31147eaf00730a1c5e00b666669e
Author: Benjamin Otte <otte redhat com>
Date:   Sun Feb 13 16:39:18 2022 +0100

    listitemmanager: Allow properties assigned to trackers
    
    In theory, we could also use callback(s) here, but if the callbacks just
    notify, it's easier to do it this way.

 gtk/gtklistbase.c               | 10 +++++-----
 gtk/gtklistitemmanager.c        | 20 +++++++++++++++++++-
 gtk/gtklistitemmanagerprivate.h |  4 +++-
 3 files changed, 27 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtklistbase.c b/gtk/gtklistbase.c
index 2548e61b31..f29ffec23a 100644
--- a/gtk/gtklistbase.c
+++ b/gtk/gtklistbase.c
@@ -1527,7 +1527,7 @@ gtk_list_base_start_rubberband (GtkListBase *self,
 
   priv->rubberband = g_new0 (RubberbandData, 1);
 
-  priv->rubberband->start_tracker = gtk_list_item_tracker_new (priv->item_manager);
+  priv->rubberband->start_tracker = gtk_list_item_tracker_new (priv->item_manager, NULL, NULL);
   gtk_list_item_tracker_set_position (priv->item_manager, priv->rubberband->start_tracker, pos, 0, 0);
   priv->rubberband->start_align_across = item_area.width ? (double) (list_x - item_area.x) / item_area.width 
: 0.5;
   priv->rubberband->start_align_along = item_area.height ? (double) (list_y - item_area.y) / 
item_area.height : 0.5;
@@ -1801,11 +1801,11 @@ gtk_list_base_init_real (GtkListBase      *self,
                                                            g_class->list_item_size,
                                                            g_class->list_item_augment_size,
                                                            g_class->list_item_augment_func);
-  priv->anchor = gtk_list_item_tracker_new (priv->item_manager);
+  priv->anchor = gtk_list_item_tracker_new (priv->item_manager, NULL, NULL);
   priv->anchor_side_along = GTK_PACK_START;
   priv->anchor_side_across = GTK_PACK_START;
-  priv->selected = gtk_list_item_tracker_new (priv->item_manager);
-  priv->focus = gtk_list_item_tracker_new (priv->item_manager);
+  priv->selected = gtk_list_item_tracker_new (priv->item_manager, NULL, NULL);
+  priv->focus = gtk_list_item_tracker_new (priv->item_manager, NULL, NULL);
 
   priv->adjustment[GTK_ORIENTATION_HORIZONTAL] = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
   g_object_ref_sink (priv->adjustment[GTK_ORIENTATION_HORIZONTAL]);
@@ -2077,7 +2077,7 @@ gtk_list_base_grab_focus_on_item (GtkListBase *self,
 
   if (!item->widget)
     {
-      GtkListItemTracker *tracker = gtk_list_item_tracker_new (priv->item_manager);
+      GtkListItemTracker *tracker = gtk_list_item_tracker_new (priv->item_manager, NULL, NULL);
 
       /* We need a tracker here to create the widget.
        * That needs to have happened or we can't grab it.
diff --git a/gtk/gtklistitemmanager.c b/gtk/gtklistitemmanager.c
index 896d714182..b623dbd9f9 100644
--- a/gtk/gtklistitemmanager.c
+++ b/gtk/gtklistitemmanager.c
@@ -48,6 +48,9 @@ struct _GtkListItemManagerClass
 
 struct _GtkListItemTracker
 {
+  GParamSpec *position_property;
+  GParamSpec *item_property;
+
   guint position;
   GtkListItemWidget *widget;
   guint n_before;
@@ -264,6 +267,9 @@ gtk_list_item_tracker_update_widget (GtkListItemManager *self,
     return;
 
   tracker->widget = widget;
+
+  if (tracker->item_property)
+    g_object_notify_by_pspec (G_OBJECT (self->widget), tracker->item_property);
 }
 
 static void
@@ -275,6 +281,9 @@ gtk_list_item_tracker_update_position (GtkListItemManager *self,
     return;
 
   tracker->position = position;
+
+  if (tracker->position_property)
+    g_object_notify_by_pspec (G_OBJECT (self->widget), tracker->position_property);
 }
 
 static void
@@ -286,6 +295,11 @@ gtk_list_item_tracker_unset_position (GtkListItemManager *self,
 
   tracker->widget = NULL;
   tracker->position = GTK_INVALID_LIST_POSITION;
+
+  if (tracker->position_property)
+    g_object_notify_by_pspec (G_OBJECT (self->widget), tracker->position_property);
+  if (tracker->item_property)
+    g_object_notify_by_pspec (G_OBJECT (self->widget), tracker->item_property);
 }
 
 static gboolean
@@ -1172,7 +1186,9 @@ gtk_list_item_manager_get_single_click_activate (GtkListItemManager   *self)
 }
 
 GtkListItemTracker *
-gtk_list_item_tracker_new (GtkListItemManager *self)
+gtk_list_item_tracker_new (GtkListItemManager *self,
+                           GParamSpec         *position_property,
+                           GParamSpec         *item_property)
 {
   GtkListItemTracker *tracker;
 
@@ -1181,6 +1197,8 @@ gtk_list_item_tracker_new (GtkListItemManager *self)
   tracker = g_slice_new0 (GtkListItemTracker);
 
   tracker->position = GTK_INVALID_LIST_POSITION;
+  tracker->position_property = position_property;
+  tracker->item_property = item_property;
 
   self->trackers = g_slist_prepend (self->trackers, tracker);
 
diff --git a/gtk/gtklistitemmanagerprivate.h b/gtk/gtklistitemmanagerprivate.h
index 096c1adbb2..cb4655e3fc 100644
--- a/gtk/gtklistitemmanagerprivate.h
+++ b/gtk/gtklistitemmanagerprivate.h
@@ -101,7 +101,9 @@ void                    gtk_list_item_manager_set_single_click_activate
 gboolean                gtk_list_item_manager_get_single_click_activate
                                                                 (GtkListItemManager     *self);
 
-GtkListItemTracker *    gtk_list_item_tracker_new               (GtkListItemManager     *self);
+GtkListItemTracker *    gtk_list_item_tracker_new               (GtkListItemManager     *self,
+                                                                 GParamSpec             *position_property,
+                                                                 GParamSpec             *item_property);
 void                    gtk_list_item_tracker_free              (GtkListItemManager     *self,
                                                                  GtkListItemTracker     *tracker);
 void                    gtk_list_item_tracker_set_position      (GtkListItemManager     *self,