[gtk/wip/otte/listview-colors: 8/8] gtk-demo: Reinstate incremental filling

[Benjamin Otte <otte src gnome org>]

commit c885f310367e87ff6deaf7bbd142cf898309a87a
Author: Benjamin Otte <otte redhat com>
Date:   Sun Jun 21 05:21:11 2020 +0200

    gtk-demo: Reinstate incremental filling
    
    Do it via the new size setting on the color list.
    
    Also add an option to set the maximum size of the color list that it'll
    be filled to so rudimentary performance testing is possible.
    
    Hint: Do not select 16777216.
    
    This reinstates commit c16848c2bb683f7ddf51571aa5951f8a4a1ea622.

 demos/gtk-demo/listview_colors.c | 106 +++++++++++++++++++++++++++++++++++----
 1 file changed, 96 insertions(+), 10 deletions(-)
---
diff --git a/demos/gtk-demo/listview_colors.c b/demos/gtk-demo/listview_colors.c
index b961f8f1ab..7441b3249a 100644
--- a/demos/gtk-demo/listview_colors.c
+++ b/demos/gtk-demo/listview_colors.c
@@ -426,6 +426,21 @@ gtk_color_list_get_property (GObject    *object,
     }
 }
 
+static void
+gtk_color_list_set_size (GtkColorList *self,
+                         guint         size)
+{
+  guint old_size = self->size;
+
+  self->size = size;
+  if (self->size > old_size)
+    g_list_model_items_changed (G_LIST_MODEL (self), old_size, 0, self->size - old_size);
+  else if (old_size > self->size)
+    g_list_model_items_changed (G_LIST_MODEL (self), self->size, old_size - self->size, 0);
+
+  g_object_notify_by_pspec (G_OBJECT (self), list_properties[LIST_PROP_SIZE]);
+}
+
 static void
 gtk_color_list_set_property (GObject      *object,
                              guint         property_id,
@@ -437,14 +452,7 @@ gtk_color_list_set_property (GObject      *object,
   switch (property_id)
     {
     case LIST_PROP_SIZE:
-      {
-        guint old_size = self->size;
-        self->size = g_value_get_uint (value);
-        if (self->size > old_size)
-          g_list_model_items_changed (G_LIST_MODEL (self), old_size, 0, self->size - old_size);
-        else if (old_size > self->size)
-          g_list_model_items_changed (G_LIST_MODEL (self), self->size, old_size - self->size, 0);
-      }
+      gtk_color_list_set_size (self, g_value_get_uint (value));
       break;
 
     default:
@@ -658,7 +666,7 @@ create_color_grid (void)
   gtk_grid_view_set_max_columns (GTK_GRID_VIEW (gridview), 24);
   gtk_grid_view_set_enable_rubberband (GTK_GRID_VIEW (gridview), TRUE);
 
-  model = G_LIST_MODEL (gtk_sort_list_model_new (gtk_color_list_new (1<<12), NULL));
+  model = G_LIST_MODEL (gtk_sort_list_model_new (gtk_color_list_new (0), NULL));
 
   selection = G_LIST_MODEL (gtk_property_selection_new (model, "selected"));
   gtk_grid_view_set_model (GTK_GRID_VIEW (gridview), selection);
@@ -668,6 +676,63 @@ create_color_grid (void)
   return gridview;
 }
 
+static gboolean
+add_colors (GtkWidget     *widget,
+            GdkFrameClock *clock,
+            gpointer       data)
+{
+  GtkColorList *colors = data;
+  guint limit;
+
+  limit = GPOINTER_TO_UINT (g_object_get_data (data, "limit"));
+  gtk_color_list_set_size (colors, MIN (limit, colors->size + MAX (1, limit / 4096)));
+  
+  if (colors->size >= limit)
+    return G_SOURCE_REMOVE;
+  else
+    return G_SOURCE_CONTINUE;
+}
+
+static void
+refill (GtkWidget    *button,
+        GtkColorList *colors)
+{
+  gtk_color_list_set_size (colors, 0);
+  gtk_widget_add_tick_callback (button, add_colors, g_object_ref (colors), g_object_unref);
+}
+ 
+static void
+limit_changed_cb (GtkDropDown  *dropdown,
+                  GParamSpec   *pspec,
+                  GtkColorList *colors)
+{
+  guint new_limit, old_limit;
+
+  old_limit = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (colors), "limit"));
+  new_limit = 1 << (3 * (gtk_drop_down_get_selected (dropdown) + 1));
+
+  g_object_set_data (G_OBJECT (colors), "limit", GUINT_TO_POINTER (new_limit));
+
+  if (old_limit == colors->size)
+    gtk_color_list_set_size (colors, new_limit);
+}
+
+static void
+items_changed_cb (GListModel *model,
+                  guint       position,
+                  guint       removed,
+                  guint       added,
+                  GtkWidget  *label)
+{
+  guint n = g_list_model_get_n_items (model);
+  char *text;
+
+  text = g_strdup_printf ("%u /", n);
+  gtk_label_set_label (GTK_LABEL (label), text);
+  g_free (text);
+}
+
+
 static GtkWidget *window = NULL;
 
 GtkWidget *
@@ -679,11 +744,12 @@ do_listview_colors (GtkWidget *do_widget)
       GtkListItemFactory *factory;
       GListStore *factories;
       GListModel *model;
-
       GtkSorter *sorter;
       GtkSorter *multi_sorter;
       GListStore *sorters;
       GtkExpression *expression;
+      GtkWidget *button;
+      GtkWidget *label;
 
       window = gtk_window_new ();
       gtk_window_set_title (GTK_WINDOW (window), "Colors");
@@ -704,6 +770,26 @@ do_listview_colors (GtkWidget *do_widget)
       model = gtk_grid_view_get_model (GTK_GRID_VIEW (gridview));
       g_object_get (model, "model", &model, NULL);
 
+      button = gtk_button_new_with_mnemonic ("_Refill");
+      g_signal_connect (button, "clicked",
+                        G_CALLBACK (refill),
+                        gtk_sort_list_model_get_model (GTK_SORT_LIST_MODEL (model)));
+
+      gtk_header_bar_pack_start (GTK_HEADER_BAR (header), button);
+
+      label = gtk_label_new ("0 /");
+      g_signal_connect (gtk_grid_view_get_model (GTK_GRID_VIEW (gridview)),
+                        "items-changed", G_CALLBACK (items_changed_cb), label);
+      gtk_header_bar_pack_start (GTK_HEADER_BAR (header), label);
+
+      dropdown = gtk_drop_down_new ();
+      gtk_drop_down_set_from_strings (GTK_DROP_DOWN (dropdown), (const char *[]) { "8", "64", "512", "4096", 
"32768", "262144", "2097152", "16777216", NULL });
+      g_signal_connect (dropdown, "notify::selected",
+                        G_CALLBACK (limit_changed_cb), 
+                        gtk_sort_list_model_get_model (GTK_SORT_LIST_MODEL (model)));
+      gtk_drop_down_set_selected (GTK_DROP_DOWN (dropdown), 3); /* 4096 */
+      gtk_header_bar_pack_start (GTK_HEADER_BAR (header), dropdown);
+
       sorters = g_list_store_new (GTK_TYPE_SORTER);
 
       sorter = gtk_string_sorter_new (gtk_property_expression_new (GTK_TYPE_COLOR, NULL, "name"));