[gnome-builder/wip/chergert/layout] symbol-tree: add search to symbol popover

[Christian Hergert <chergert src gnome org>]

commit 3e2dcc8c60132d5e148da93d04f443766598b8ac
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jul 1 18:35:04 2017 -0700

    symbol-tree: add search to symbol popover
    
    This is useful for quickly filtering the symbols based on a
    search query. We should probably make this easily focusable
    by keybinding with a layout-view action.

 plugins/symbol-tree/gbp-symbol-menu-button.c  |   49 ++++++++++++++++++++++++-
 plugins/symbol-tree/gbp-symbol-menu-button.ui |   32 +++++++++++-----
 2 files changed, 70 insertions(+), 11 deletions(-)
---
diff --git a/plugins/symbol-tree/gbp-symbol-menu-button.c b/plugins/symbol-tree/gbp-symbol-menu-button.c
index 6879a21..73062ba 100644
--- a/plugins/symbol-tree/gbp-symbol-menu-button.c
+++ b/plugins/symbol-tree/gbp-symbol-menu-button.c
@@ -31,7 +31,8 @@ struct _GbpSymbolMenuButton
   /* Template references */
   DzlTree        *tree;
   DzlTreeBuilder *tree_builder;
-  GtkWidget      *popover;
+  GtkPopover     *popover;
+  GtkSearchEntry *search_entry;
 };
 
 enum {
@@ -44,6 +45,46 @@ G_DEFINE_TYPE (GbpSymbolMenuButton, gbp_symbol_menu_button, GTK_TYPE_MENU_BUTTON
 
 static GParamSpec *properties [N_PROPS];
 
+static gboolean
+filter_symbols_cb (DzlTree     *tree,
+                   DzlTreeNode *node,
+                   gpointer     user_data)
+{
+  DzlPatternSpec *spec = user_data;
+  const gchar *text;
+
+  if G_LIKELY (NULL != (text = dzl_tree_node_get_text (node)))
+    return dzl_pattern_spec_match (spec, text);
+
+  return FALSE;
+}
+
+static void
+gbp_symbol_menu_button_search_changed (GbpSymbolMenuButton *self,
+                                       GtkSearchEntry      *search_entry)
+{
+  DzlPatternSpec *spec;
+  const gchar *text;
+
+  g_assert (GBP_IS_SYMBOL_MENU_BUTTON (self));
+  g_assert (GTK_IS_SEARCH_ENTRY (search_entry));
+
+  text = gtk_entry_get_text (GTK_ENTRY (search_entry));
+
+  if (ide_str_empty0 (text))
+    {
+      dzl_tree_set_filter (self->tree, NULL, NULL, NULL);
+      return;
+    }
+
+  spec = dzl_pattern_spec_new (text);
+  dzl_tree_set_filter (self->tree,
+                       filter_symbols_cb,
+                       spec,
+                       (GDestroyNotify)dzl_pattern_spec_unref);
+  gtk_tree_view_expand_all (GTK_TREE_VIEW (self->tree));
+}
+
 static void
 gbp_symbol_menu_button_destroy (GtkWidget *widget)
 {
@@ -108,6 +149,7 @@ gbp_symbol_menu_button_class_init (GbpSymbolMenuButtonClass *klass)
 
   gtk_widget_class_set_template_from_resource (widget_class, 
"/org/gnome/builder/plugins/symbol-tree-plugin/gbp-symbol-menu-button.ui");
   gtk_widget_class_bind_template_child (widget_class, GbpSymbolMenuButton, popover);
+  gtk_widget_class_bind_template_child (widget_class, GbpSymbolMenuButton, search_entry);
   gtk_widget_class_bind_template_child (widget_class, GbpSymbolMenuButton, tree);
   gtk_widget_class_bind_template_child (widget_class, GbpSymbolMenuButton, tree_builder);
 
@@ -127,6 +169,11 @@ static void
 gbp_symbol_menu_button_init (GbpSymbolMenuButton *self)
 {
   gtk_widget_init_template (GTK_WIDGET (self));
+
+  g_signal_connect_swapped (self->search_entry,
+                            "changed",
+                            G_CALLBACK (gbp_symbol_menu_button_search_changed),
+                            self);
 }
 
 /**
diff --git a/plugins/symbol-tree/gbp-symbol-menu-button.ui b/plugins/symbol-tree/gbp-symbol-menu-button.ui
index 39c35f9..00667c4 100644
--- a/plugins/symbol-tree/gbp-symbol-menu-button.ui
+++ b/plugins/symbol-tree/gbp-symbol-menu-button.ui
@@ -5,19 +5,31 @@
       <class name="symbols-button"/>
     </style>
     <child>
-      <object class="GtkScrolledWindow">
-        <property name="propagate-natural-width">true</property>
-        <property name="propagate-natural-height">true</property>
-        <property name="max-content-height">600</property>
+      <object class="GtkBox">
+        <property name="orientation">vertical</property>
         <property name="visible">true</property>
         <child>
-          <object class="DzlTree" id="tree">
-            <property name="headers-visible">false</property>
-            <property name="show-icons">true</property>
-            <property name="activate-on-single-click">true</property>
+          <object class="GtkSearchEntry" id="search_entry">
+            <property name="margin">6</property>
             <property name="visible">true</property>
-            <child type="builder">
-              <object class="GbpSymbolTreeBuilder" id="tree_builder"/>
+          </object>
+        </child>
+        <child>
+          <object class="GtkScrolledWindow">
+            <property name="propagate-natural-width">true</property>
+            <property name="propagate-natural-height">true</property>
+            <property name="max-content-height">600</property>
+            <property name="visible">true</property>
+            <child>
+              <object class="DzlTree" id="tree">
+                <property name="headers-visible">false</property>
+                <property name="show-icons">true</property>
+                <property name="activate-on-single-click">true</property>
+                <property name="visible">true</property>
+                <child type="builder">
+                  <object class="GbpSymbolTreeBuilder" id="tree_builder"/>
+                </child>
+              </object>
             </child>
           </object>
         </child>