[gtk+] inspector: Parse custom css with a delay

[Matthias Clasen <matthiasc src gnome org>]

commit f6cf7fee73a18892bf59e52dc440fa16abbea22d
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jun 3 09:44:28 2014 -0400

    inspector: Parse custom css with a delay
    
    The CSS editor was feeling a little sluggish, because it was
    reparsing and reapplying the CSS on every keystroke. Add a small
    delay, to make this feel smoother.

 gtk/inspector/css-editor.c |   40 +++++++++++++++++++++++++++++++++++++---
 1 files changed, 37 insertions(+), 3 deletions(-)
---
diff --git a/gtk/inspector/css-editor.c b/gtk/inspector/css-editor.c
index 10c63b9..8224c6a 100644
--- a/gtk/inspector/css-editor.c
+++ b/gtk/inspector/css-editor.c
@@ -55,6 +55,7 @@ struct _GtkInspectorCssEditorPrivate
   gboolean global;
   GtkStyleContext *context;
   GtkToggleToolButton *disable_button;
+  guint timeout;
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GtkInspectorCssEditor, gtk_inspector_css_editor, GTK_TYPE_BOX)
@@ -207,8 +208,7 @@ apply_system_font (GtkInspectorCssEditor *ce)
 }
 
 static void
-text_changed (GtkTextBuffer         *buffer,
-              GtkInspectorCssEditor *ce)
+update_style (GtkInspectorCssEditor *ce)
 {
   GtkCssProvider *provider;
   gchar *text;
@@ -220,13 +220,35 @@ text_changed (GtkTextBuffer         *buffer,
   else
     return;
 
-  text = get_current_text (buffer);
+  text = get_current_text (ce->priv->text);
   gtk_css_provider_load_from_data (provider, text, -1, NULL);
   g_free (text);
 
   gtk_style_context_reset_widgets (gdk_screen_get_default ());
 }
 
+static gboolean
+update_timeout (gpointer data)
+{
+  GtkInspectorCssEditor *ce = data;
+
+  ce->priv->timeout = 0;
+
+  update_style (ce);
+
+  return G_SOURCE_REMOVE;
+}
+
+static void
+text_changed (GtkTextBuffer         *buffer,
+              GtkInspectorCssEditor *ce)
+{
+  if (ce->priv->timeout != 0)
+    g_source_remove (ce->priv->timeout);
+
+  ce->priv->timeout = g_timeout_add (100, update_timeout, ce); 
+}
+
 static void
 show_parsing_error (GtkCssProvider        *provider,
                     GtkCssSection         *section,
@@ -338,6 +360,17 @@ set_property (GObject      *object,
 }
 
 static void
+finalize (GObject *object)
+{
+  GtkInspectorCssEditor *ce = GTK_INSPECTOR_CSS_EDITOR (object);
+
+  if (ce->priv->timeout != 0)
+    g_source_remove (ce->priv->timeout);
+
+  G_OBJECT_CLASS (gtk_inspector_css_editor_parent_class)->finalize (object);
+}
+
+static void
 gtk_inspector_css_editor_class_init (GtkInspectorCssEditorClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
@@ -346,6 +379,7 @@ gtk_inspector_css_editor_class_init (GtkInspectorCssEditorClass *klass)
   object_class->get_property = get_property;
   object_class->set_property = set_property;
   object_class->constructed = constructed;
+  object_class->finalize = finalize;
 
   g_object_class_install_property (object_class, PROP_GLOBAL,
       g_param_spec_boolean ("global", "Global", "Whether this editor changes the whole application or just 
the selected widget",