Renaming.

LdCategoryViewIf -> LdCategoryView -> LdCategoryTreeView

8 files changed, 488 insertions, 487 deletions

diff --git a/liblogdiag/ld-category-symbol-view.c b/liblogdiag/ld-category-symbol-view.c
index 3cf975f..aa3fe8c 100644
--- a/liblogdiag/ld-category-symbol-view.c
+++ b/liblogdiag/ld-category-symbol-view.c
@@ -71,9 +71,9 @@ static void ld_category_symbol_view_set_property (GObject *object,
 static void ld_category_symbol_view_finalize (GObject *gobject);
 
 static void ld_category_symbol_view_set_category
-	(LdCategoryViewIf *iface, LdCategory *category);
+	(LdCategoryView *iface, LdCategory *category);
 static LdCategory *ld_category_symbol_view_get_category
-	(LdCategoryViewIf *iface);
+	(LdCategoryView *iface);
 
 static void on_size_request (GtkWidget *widget, GtkRequisition *requisition,
 	gpointer user_data);
@@ -84,7 +84,7 @@ static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
 
 
 static void
-ld_category_view_if_init (LdCategoryViewIfInterface *iface)
+ld_category_view_init (LdCategoryViewInterface *iface)
 {
 	iface->set_category = ld_category_symbol_view_set_category;
 	iface->get_category = ld_category_symbol_view_get_category;
@@ -92,7 +92,7 @@ ld_category_view_if_init (LdCategoryViewIfInterface *iface)
 
 G_DEFINE_TYPE_WITH_CODE (LdCategorySymbolView,
 	ld_category_symbol_view, GTK_TYPE_DRAWING_AREA,
-	G_IMPLEMENT_INTERFACE (LD_TYPE_CATEGORY_VIEW_IF, ld_category_view_if_init));
+	G_IMPLEMENT_INTERFACE (LD_TYPE_CATEGORY_VIEW, ld_category_view_init));
 
 static void
 ld_category_symbol_view_class_init (LdCategorySymbolViewClass *klass)
@@ -128,7 +128,7 @@ symbol_deselect (LdCategorySymbolView *self)
 	if (!preselected)
 		return;
 
-	g_signal_emit (self, LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->
+	g_signal_emit (self, LD_CATEGORY_VIEW_GET_INTERFACE (self)->
 		symbol_deselected_signal, 0, preselected->symbol, preselected->path);
 
 	symbol_redraw (self, preselected);
@@ -175,7 +175,7 @@ on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data)
 			gtk_drag_source_set (widget,
 				GDK_BUTTON1_MASK, &target, 1, GDK_ACTION_COPY);
 
-			g_signal_emit (self, LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->
+			g_signal_emit (self, LD_CATEGORY_VIEW_GET_INTERFACE (self)->
 				symbol_selected_signal, 0, data->symbol, data->path);
 		}
 		return FALSE;
@@ -298,7 +298,7 @@ ld_category_symbol_view_get_property (GObject *object, guint property_id,
 	{
 	case PROP_CATEGORY:
 		g_value_set_object (value,
-			ld_category_view_if_get_category (LD_CATEGORY_VIEW_IF (object)));
+			ld_category_view_get_category (LD_CATEGORY_VIEW (object)));
 		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
@@ -312,7 +312,7 @@ ld_category_symbol_view_set_property (GObject *object, guint property_id,
 	switch (property_id)
 	{
 	case PROP_CATEGORY:
-		ld_category_view_if_set_category (LD_CATEGORY_VIEW_IF (object),
+		ld_category_view_set_category (LD_CATEGORY_VIEW (object),
 			LD_CATEGORY (g_value_get_object (value)));
 		break;
 	default:
@@ -541,12 +541,12 @@ ld_category_symbol_view_new (LdCategory *category)
 	LdCategorySymbolView *self;
 
 	self = g_object_new (LD_TYPE_CATEGORY_SYMBOL_VIEW, NULL);
-	ld_category_view_if_set_category (LD_CATEGORY_VIEW_IF (self), category);
+	ld_category_view_set_category (LD_CATEGORY_VIEW (self), category);
 	return GTK_WIDGET (self);
 }
 
 static void
-ld_category_symbol_view_set_category (LdCategoryViewIf *iface,
+ld_category_symbol_view_set_category (LdCategoryView *iface,
 	LdCategory *category)
 {
 	LdCategorySymbolView *self;
@@ -575,7 +575,7 @@ ld_category_symbol_view_set_category (LdCategoryViewIf *iface,
 }
 
 static LdCategory *
-ld_category_symbol_view_get_category (LdCategoryViewIf *iface)
+ld_category_symbol_view_get_category (LdCategoryView *iface)
 {
 	g_return_val_if_fail (LD_IS_CATEGORY_SYMBOL_VIEW (iface), NULL);
 	return LD_CATEGORY_SYMBOL_VIEW (iface)->priv->category;
diff --git a/liblogdiag/ld-category-tree-view.c b/liblogdiag/ld-category-tree-view.c
new file mode 100644
index 0000000..674c308
--- /dev/null
+++ b/liblogdiag/ld-category-tree-view.c
@@ -0,0 +1,338 @@
+/*
+ * ld-category-tree-view.c
+ *
+ * This file is a part of logdiag.
+ * Copyright Přemysl Janouch 2011. All rights reserved.
+ *
+ * See the file LICENSE for licensing information.
+ *
+ */
+
+#include "liblogdiag.h"
+#include "config.h"
+
+
+/**
+ * SECTION:ld-category-tree-view
+ * @short_description: A category tree view widget
+ * @see_also: #LdCategory
+ *
+ * #LdCategoryTreeView enables the user to drag symbols from #LdLibrary
+ * onto #LdDiagramView.
+ */
+
+/*
+ * LdCategoryTreeViewPrivate:
+ * @category: a category object assigned as a model.
+ * @expander_prefix: a string to prepend to subcategory labels in expanders.
+ */
+struct _LdCategoryTreeViewPrivate
+{
+	LdCategory *category;
+	gchar *expander_prefix;
+};
+
+enum
+{
+	PROP_0,
+	PROP_CATEGORY
+};
+
+static void ld_category_tree_view_get_property (GObject *object,
+	guint property_id, GValue *value, GParamSpec *pspec);
+static void ld_category_tree_view_set_property (GObject *object,
+	guint property_id, const GValue *value, GParamSpec *pspec);
+static void ld_category_tree_view_dispose (GObject *gobject);
+
+static void ld_category_tree_view_set_category (LdCategoryView *iface,
+	LdCategory *category);
+static LdCategory *ld_category_tree_view_get_category (LdCategoryView *iface);
+
+static void reload_category (LdCategoryTreeView *self);
+static void load_category_cb (gpointer data, gpointer user_data);
+
+
+static void
+ld_category_view_init (LdCategoryViewInterface *iface)
+{
+	iface->set_category = ld_category_tree_view_set_category;
+	iface->get_category = ld_category_tree_view_get_category;
+}
+
+G_DEFINE_TYPE_WITH_CODE (LdCategoryTreeView,
+	ld_category_tree_view, GTK_TYPE_VBOX,
+	G_IMPLEMENT_INTERFACE (LD_TYPE_CATEGORY_VIEW, ld_category_view_init));
+
+static void
+ld_category_tree_view_class_init (LdCategoryTreeViewClass *klass)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (klass);
+	object_class->get_property = ld_category_tree_view_get_property;
+	object_class->set_property = ld_category_tree_view_set_property;
+	object_class->dispose = ld_category_tree_view_dispose;
+
+	g_object_class_override_property (object_class, PROP_CATEGORY, "category");
+
+	g_type_class_add_private (klass, sizeof (LdCategoryTreeViewPrivate));
+}
+
+static void
+ld_category_tree_view_init (LdCategoryTreeView *self)
+{
+	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
+		(self, LD_TYPE_CATEGORY_TREE_VIEW, LdCategoryTreeViewPrivate);
+}
+
+static void
+ld_category_tree_view_dispose (GObject *gobject)
+{
+	LdCategoryTreeView *self;
+
+	self = LD_CATEGORY_TREE_VIEW (gobject);
+	ld_category_view_set_category (LD_CATEGORY_VIEW (self), NULL);
+
+	g_free (self->priv->expander_prefix);
+	self->priv->expander_prefix = NULL;
+
+	/* Chain up to the parent class. */
+	G_OBJECT_CLASS (ld_category_tree_view_parent_class)->dispose (gobject);
+}
+
+static void
+ld_category_tree_view_get_property (GObject *object, guint property_id,
+	GValue *value, GParamSpec *pspec)
+{
+	switch (property_id)
+	{
+	case PROP_CATEGORY:
+		g_value_set_object (value,
+			ld_category_view_get_category (LD_CATEGORY_VIEW (object)));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+static void
+ld_category_tree_view_set_property (GObject *object, guint property_id,
+	const GValue *value, GParamSpec *pspec)
+{
+	switch (property_id)
+	{
+	case PROP_CATEGORY:
+		ld_category_view_set_category (LD_CATEGORY_VIEW (object),
+			LD_CATEGORY (g_value_get_object (value)));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+
+/**
+ * ld_category_tree_view_new:
+ * @category: (allow-none): a category to be assigned to the widget.
+ *
+ * Create an instance.
+ */
+GtkWidget *
+ld_category_tree_view_new (LdCategory *category)
+{
+	LdCategoryTreeView *self;
+
+	self = g_object_new (LD_TYPE_CATEGORY_TREE_VIEW, NULL);
+	ld_category_view_set_category (LD_CATEGORY_VIEW (self), category);
+	return GTK_WIDGET (self);
+}
+
+static void
+ld_category_tree_view_set_category (LdCategoryView *iface, LdCategory *category)
+{
+	LdCategoryTreeView *self;
+
+	g_return_if_fail (LD_IS_CATEGORY_TREE_VIEW (iface));
+	g_return_if_fail (LD_IS_CATEGORY (category) || category == NULL);
+
+	self = LD_CATEGORY_TREE_VIEW (iface);
+	if (self->priv->category)
+	{
+		g_signal_handlers_disconnect_by_func (self->priv->category,
+			reload_category, self);
+		g_object_unref (self->priv->category);
+	}
+
+	self->priv->category = category;
+
+	if (category)
+	{
+		g_signal_connect_data (category, "children-changed",
+			G_CALLBACK (reload_category), self,
+			NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
+		g_signal_connect_data (category, "notify::parent",
+			G_CALLBACK (reload_category), self,
+			NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
+		g_object_ref (category);
+	}
+	reload_category (self);
+	g_object_notify (G_OBJECT (self), "category");
+}
+
+static LdCategory *
+ld_category_tree_view_get_category (LdCategoryView *iface)
+{
+	g_return_val_if_fail (LD_IS_CATEGORY_TREE_VIEW (iface), NULL);
+	return LD_CATEGORY_TREE_VIEW (iface)->priv->category;
+}
+
+static GtkWidget *
+create_empty_label (void)
+{
+	GtkWidget *label;
+	PangoAttrList *attr;
+
+	label = gtk_label_new (_("Empty"));
+	gtk_widget_set_sensitive (label, FALSE);
+	gtk_misc_set_alignment (GTK_MISC (label), 0, 0.5);
+	gtk_misc_set_padding (GTK_MISC (label), 5, 0);
+
+	attr = pango_attr_list_new ();
+	pango_attr_list_change (attr, pango_attr_style_new (PANGO_STYLE_ITALIC));
+	gtk_label_set_attributes (GTK_LABEL (label), attr);
+	pango_attr_list_unref (attr);
+
+	return label;
+}
+
+static void
+reconstruct_prefix (LdCategoryTreeView *self)
+{
+	LdCategory *iter;
+	gchar *start, *end;
+
+	start = g_strdup ("");
+	end   = g_strdup ("");
+
+	for (iter = self->priv->category; iter;
+		iter = ld_category_get_parent (iter))
+	{
+		const gchar *name;
+		gchar *new_start, *new_end, *name_escaped;
+
+		/* Stop at the root category. */
+		if (!strcmp (ld_category_get_name (iter),
+			LD_LIBRARY_IDENTIFIER_SEPARATOR))
+			break;
+
+		name = ld_category_get_human_name (iter);
+		name_escaped = g_markup_escape_text (name, -1);
+
+		new_start = g_strconcat (start, "<small>", NULL);
+		new_end   = g_strconcat (name_escaped, ":</small> ", end, NULL);
+
+		g_free (name_escaped);
+		g_free (start);
+		g_free (end);
+
+		start = new_start;
+		end   = new_end;
+	}
+
+	g_free (self->priv->expander_prefix);
+	self->priv->expander_prefix = g_strconcat (start, end, NULL);
+	g_free (start);
+	g_free (end);
+}
+
+static void
+on_symbol_selected (GObject *source,
+	LdSymbol *symbol, const gchar *path, LdCategoryTreeView *self)
+{
+	g_signal_emit (self, LD_CATEGORY_VIEW_GET_INTERFACE (self)->
+		symbol_selected_signal, 0, symbol, path);
+}
+
+static void
+on_symbol_deselected (GObject *source,
+	LdSymbol *symbol, const gchar *path, LdCategoryTreeView *self)
+{
+	g_signal_emit (self, LD_CATEGORY_VIEW_GET_INTERFACE (self)->
+		symbol_deselected_signal, 0, symbol, path);
+}
+
+static void
+reload_category (LdCategoryTreeView *self)
+{
+	g_return_if_fail (LD_IS_CATEGORY_TREE_VIEW (self));
+
+	/* Clear the container first, if there is already something in it. */
+	gtk_container_foreach (GTK_CONTAINER (self),
+		(GtkCallback) gtk_widget_destroy, NULL);
+
+	/* XXX: We might want to disconnect signal handlers. */
+
+	if (self->priv->category)
+	{
+		GSList *symbols, *children;
+
+		symbols  = (GSList *) ld_category_get_symbols  (self->priv->category);
+		children = (GSList *) ld_category_get_children (self->priv->category);
+
+		if (symbols)
+		{
+			GtkWidget *symbol_view;
+
+			symbol_view = ld_category_symbol_view_new (self->priv->category);
+			gtk_box_pack_start (GTK_BOX (self), symbol_view, FALSE, FALSE, 0);
+
+			g_signal_connect_after (symbol_view, "symbol-selected",
+				G_CALLBACK (on_symbol_selected), self);
+			g_signal_connect_after (symbol_view, "symbol-deselected",
+				G_CALLBACK (on_symbol_deselected), self);
+		}
+
+		if (children)
+		{
+			reconstruct_prefix (self);
+			g_slist_foreach (children, load_category_cb, self);
+		}
+		else if (!symbols)
+			gtk_box_pack_start (GTK_BOX (self),
+				create_empty_label (), FALSE, FALSE, 0);
+	}
+}
+
+static void
+load_category_cb (gpointer data, gpointer user_data)
+{
+	LdCategoryTreeView *self;
+	LdCategory *cat;
+	GtkWidget *expander, *child;
+	gchar *name, *label_markup;
+
+	g_return_if_fail (LD_IS_CATEGORY_TREE_VIEW (user_data));
+	g_return_if_fail (LD_IS_CATEGORY (data));
+
+	self = user_data;
+	cat = data;
+
+	name = g_markup_escape_text (ld_category_get_human_name (cat), -1);
+	label_markup = g_strconcat (self->priv->expander_prefix, name, NULL);
+	g_free (name);
+
+	expander = gtk_expander_new (label_markup);
+	gtk_expander_set_expanded (GTK_EXPANDER (expander), TRUE);
+	gtk_expander_set_use_markup (GTK_EXPANDER (expander), TRUE);
+	g_free (label_markup);
+
+	child = ld_category_tree_view_new (cat);
+	gtk_container_add (GTK_CONTAINER (expander), child);
+	gtk_box_pack_start (GTK_BOX (self), expander, FALSE, FALSE, 0);
+
+	g_signal_connect_after (child, "symbol-selected",
+		G_CALLBACK (on_symbol_selected), self);
+	g_signal_connect_after (child, "symbol-deselected",
+		G_CALLBACK (on_symbol_deselected), self);
+}
+
diff --git a/liblogdiag/ld-category-tree-view.h b/liblogdiag/ld-category-tree-view.h
new file mode 100644
index 0000000..f5456f2
--- /dev/null
+++ b/liblogdiag/ld-category-tree-view.h
@@ -0,0 +1,58 @@
+/*
+ * ld-category-tree-view.h
+ *
+ * This file is a part of logdiag.
+ * Copyright Přemysl Janouch 2011. All rights reserved.
+ *
+ * See the file LICENSE for licensing information.
+ *
+ */
+
+#ifndef __LD_CATEGORY_TREE_VIEW_H__
+#define __LD_CATEGORY_TREE_VIEW_H__
+
+G_BEGIN_DECLS
+
+
+#define LD_TYPE_CATEGORY_TREE_VIEW (ld_category_tree_view_get_type ())
+#define LD_CATEGORY_TREE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_CAST \
+	((obj), LD_TYPE_CATEGORY_TREE_VIEW, LdCategoryTreeView))
+#define LD_CATEGORY_TREE_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST \
+	((klass), LD_TYPE_CATEGORY_TREE_VIEW, LdCategoryTreeViewClass))
+#define LD_IS_CATEGORY_TREE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_TYPE \
+	((obj), LD_TYPE_CATEGORY_TREE_VIEW))
+#define LD_IS_CATEGORY_TREE_VIEW_CLASS(klass) (G_TYPE_CHECK_INSTANCE_TYPE \
+	((klass), LD_TYPE_CATEGORY_TREE_VIEW))
+#define LD_CATEGORY_TREE_VIEW_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS \
+	((obj), LD_CATEGORY_TREE_VIEW, LdCategoryTreeViewClass))
+
+typedef struct _LdCategoryTreeView LdCategoryTreeView;
+typedef struct _LdCategoryTreeViewPrivate LdCategoryTreeViewPrivate;
+typedef struct _LdCategoryTreeViewClass LdCategoryTreeViewClass;
+
+
+/**
+ * LdCategoryTreeView:
+ */
+struct _LdCategoryTreeView
+{
+/*< private >*/
+	GtkVBox parent_instance;
+	LdCategoryTreeViewPrivate *priv;
+};
+
+struct _LdCategoryTreeViewClass
+{
+/*< private >*/
+	GtkVBoxClass parent_class;
+};
+
+
+GType ld_category_tree_view_get_type (void) G_GNUC_CONST;
+
+GtkWidget *ld_category_tree_view_new (LdCategory *category);
+
+
+G_END_DECLS
+
+#endif /* ! __LD_CATEGORY_TREE_VIEW_H__ */
diff --git a/liblogdiag/ld-category-view-if.c b/liblogdiag/ld-category-view-if.c
deleted file mode 100644
index 18a37e1..0000000
--- a/liblogdiag/ld-category-view-if.c
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * ld-category-view-if.c
- *
- * This file is a part of logdiag.
- * Copyright Přemysl Janouch 2012. All rights reserved.
- *
- * See the file LICENSE for licensing information.
- *
- */
-
-#include "liblogdiag.h"
-#include "config.h"
-
-
-/**
- * SECTION:ld-category-view-if
- * @short_description: Interface for objects displaying categories
- * @see_also: #LdCategory
- *
- * #LdCategoryViewIf defines objects displaying contents of #LdCategory
- * hierarchies.
- */
-
-G_DEFINE_INTERFACE (LdCategoryViewIf, ld_category_view_if, 0);
-
-static void
-ld_category_view_if_default_init (LdCategoryViewIfInterface *iface)
-{
-	GParamSpec *pspec;
-
-/**
- * LdCategoryViewIf::symbol-selected:
- * @self: an #LdCategoryView object.
- * @symbol: the selected #LdSymbol object.
- * @path: location of the symbol within the library.
- *
- * A symbol has been selected.
- */
-	iface->symbol_selected_signal = g_signal_new
-		("symbol-selected", G_TYPE_FROM_INTERFACE (iface),
-		G_SIGNAL_RUN_LAST, 0, NULL, NULL,
-		ld_marshal_VOID__OBJECT_STRING,
-		G_TYPE_NONE, 2, LD_TYPE_SYMBOL,
-		G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
-
-/**
- * LdCategoryViewIf::symbol-deselected:
- * @self: an #LdCategoryView object.
- * @symbol: the deselected #LdSymbol object.
- * @path: location of the symbol within the library.
- *
- * A symbol has been deselected.
- */
-	iface->symbol_deselected_signal = g_signal_new
-		("symbol-deselected", G_TYPE_FROM_INTERFACE (iface),
-		G_SIGNAL_RUN_LAST, 0, NULL, NULL,
-		ld_marshal_VOID__OBJECT_STRING,
-		G_TYPE_NONE, 2, LD_TYPE_SYMBOL,
-		G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
-
-/**
- * LdCategoryViewIf:category:
- *
- * The #LdCategory this object retrieves content from.
- */
-	pspec = g_param_spec_object ("category", "Category",
-		"The symbol category that is shown by this object.",
-		LD_TYPE_CATEGORY, G_PARAM_READWRITE);
-	g_object_interface_install_property (iface, pspec);
-}
-
-/**
- * ld_category_view_if_set_category:
- * @self: an #LdCategorylViewIf object.
- * @category: the #LdCategory to be assigned to the view.
- *
- * Assign an #LdCategory object to the view.
- */
-void
-ld_category_view_if_set_category (LdCategoryViewIf *self,
-	LdCategory *category)
-{
-	g_return_if_fail (LD_IS_CATEGORY_VIEW_IF (self));
-	LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->set_category (self, category);
-}
-
-/**
- * ld_category_view_if_get_category:
- * @self: an #LdCategoryViewIf object.
- *
- * Get the #LdCategory object assigned to this view.
- * The reference count on the category is not incremented.
- */
-LdCategory *
-ld_category_view_if_get_category (LdCategoryViewIf *self)
-{
-	g_return_val_if_fail (LD_IS_CATEGORY_VIEW_IF (self), NULL);
-	return LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->get_category (self);
-}
diff --git a/liblogdiag/ld-category-view-if.h b/liblogdiag/ld-category-view-if.h
deleted file mode 100644
index 7cdfa9d..0000000
--- a/liblogdiag/ld-category-view-if.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * ld-category-view-if.h
- *
- * This file is a part of logdiag.
- * Copyright Přemysl Janouch 2012. All rights reserved.
- *
- * See the file LICENSE for licensing information.
- *
- */
-
-#ifndef __LD_CATEGORY_VIEW_IF_H__
-#define __LD_CATEGORY_VIEW_IF_H__
-
-G_BEGIN_DECLS
-
-
-#define LD_TYPE_CATEGORY_VIEW_IF (ld_category_view_if_get_type ())
-#define LD_CATEGORY_VIEW_IF(obj) (G_TYPE_CHECK_INSTANCE_CAST \
-	((obj), LD_TYPE_CATEGORY_VIEW_IF, LdCategoryViewIf))
-#define LD_IS_CATEGORY_VIEW_IF(obj) (G_TYPE_CHECK_INSTANCE_TYPE \
-	((obj), LD_TYPE_CATEGORY_VIEW_IF))
-#define LD_CATEGORY_VIEW_IF_GET_INTERFACE(inst) (G_TYPE_INSTANCE_GET_INTERFACE \
-	((inst), LD_TYPE_CATEGORY_VIEW_IF, LdCategoryViewIfInterface))
-
-typedef struct _LdCategoryViewIf LdCategoryViewIf;
-typedef struct _LdCategoryViewIfInterface LdCategoryViewIfInterface;
-
-/**
- * LdCategoryViewIf:
- */
-struct _LdCategoryViewIf
-{
-	/* Just to remind gtk-doc that this really exists. */
-};
-
-struct _LdCategoryViewIfInterface
-{
-/*< private >*/
-	GTypeInterface parent;
-
-	guint symbol_selected_signal;
-	guint symbol_deselected_signal;
-
-	void (*set_category) (LdCategoryViewIf *self, LdCategory *category);
-	LdCategory *(*get_category) (LdCategoryViewIf *self);
-};
-
-
-GType ld_category_view_if_get_type (void) G_GNUC_CONST;
-
-void ld_category_view_if_set_category (LdCategoryViewIf *self,
-	LdCategory *category);
-LdCategory *ld_category_view_if_get_category (LdCategoryViewIf *self);
-
-
-G_END_DECLS
-
-#endif /* ! __LD_CATEGORY_VIEW_IF_H__ */
diff --git a/liblogdiag/ld-category-view.c b/liblogdiag/ld-category-view.c
index 707627d..839b099 100644
--- a/liblogdiag/ld-category-view.c
+++ b/liblogdiag/ld-category-view.c
@@ -2,7 +2,7 @@
  * ld-category-view.c
  *
  * This file is a part of logdiag.
- * Copyright Přemysl Janouch 2011. All rights reserved.
+ * Copyright Přemysl Janouch 2012. All rights reserved.
  *
  * See the file LICENSE for licensing information.
  *
@@ -14,324 +14,86 @@
 
 /**
  * SECTION:ld-category-view
- * @short_description: A category view widget
+ * @short_description: Interface for objects displaying categories
  * @see_also: #LdCategory
  *
- * #LdCategoryView enables the user to drag symbols from #LdLibrary
- * onto #LdDiagramView.
+ * #LdCategoryView defines objects displaying contents of #LdCategory
+ * hierarchies.
  */
 
-/*
- * LdCategoryViewPrivate:
- * @category: a category object assigned as a model.
- * @expander_prefix: a string to prepend to subcategory labels in expanders.
- */
-struct _LdCategoryViewPrivate
-{
-	LdCategory *category;
-	gchar *expander_prefix;
-};
-
-enum
-{
-	PROP_0,
-	PROP_CATEGORY
-};
-
-static void ld_category_view_get_property (GObject *object, guint property_id,
-	GValue *value, GParamSpec *pspec);
-static void ld_category_view_set_property (GObject *object, guint property_id,
-	const GValue *value, GParamSpec *pspec);
-static void ld_category_view_dispose (GObject *gobject);
-
-static void ld_category_view_set_category (LdCategoryViewIf *iface,
-	LdCategory *category);
-static LdCategory *ld_category_view_get_category (LdCategoryViewIf *iface);
-
-static void reload_category (LdCategoryView *self);
-static void load_category_cb (gpointer data, gpointer user_data);
-
-
-static void
-ld_category_view_if_init (LdCategoryViewIfInterface *iface)
-{
-	iface->set_category = ld_category_view_set_category;
-	iface->get_category = ld_category_view_get_category;
-}
-
-G_DEFINE_TYPE_WITH_CODE (LdCategoryView, ld_category_view, GTK_TYPE_VBOX,
-	G_IMPLEMENT_INTERFACE (LD_TYPE_CATEGORY_VIEW_IF, ld_category_view_if_init));
-
-static void
-ld_category_view_class_init (LdCategoryViewClass *klass)
-{
-	GObjectClass *object_class;
-
-	object_class = G_OBJECT_CLASS (klass);
-	object_class->get_property = ld_category_view_get_property;
-	object_class->set_property = ld_category_view_set_property;
-	object_class->dispose = ld_category_view_dispose;
-
-	g_object_class_override_property (object_class, PROP_CATEGORY, "category");
-
-	g_type_class_add_private (klass, sizeof (LdCategoryViewPrivate));
-}
-
-static void
-ld_category_view_init (LdCategoryView *self)
-{
-	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
-		(self, LD_TYPE_CATEGORY_VIEW, LdCategoryViewPrivate);
-}
-
-static void
-ld_category_view_dispose (GObject *gobject)
-{
-	LdCategoryView *self;
-
-	self = LD_CATEGORY_VIEW (gobject);
-	ld_category_view_if_set_category (LD_CATEGORY_VIEW_IF (self), NULL);
-
-	g_free (self->priv->expander_prefix);
-	self->priv->expander_prefix = NULL;
-
-	/* Chain up to the parent class. */
-	G_OBJECT_CLASS (ld_category_view_parent_class)->dispose (gobject);
-}
+G_DEFINE_INTERFACE (LdCategoryView, ld_category_view, 0);
 
 static void
-ld_category_view_get_property (GObject *object, guint property_id,
-	GValue *value, GParamSpec *pspec)
+ld_category_view_default_init (LdCategoryViewInterface *iface)
 {
-	switch (property_id)
-	{
-	case PROP_CATEGORY:
-		g_value_set_object (value,
-			ld_category_view_if_get_category (LD_CATEGORY_VIEW_IF (object)));
-		break;
-	default:
-		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
-	}
-}
-
-static void
-ld_category_view_set_property (GObject *object, guint property_id,
-	const GValue *value, GParamSpec *pspec)
-{
-	switch (property_id)
-	{
-	case PROP_CATEGORY:
-		ld_category_view_if_set_category (LD_CATEGORY_VIEW_IF (object),
-			LD_CATEGORY (g_value_get_object (value)));
-		break;
-	default:
-		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
-	}
-}
-
+	GParamSpec *pspec;
 
 /**
- * ld_category_view_new:
- * @category: (allow-none): a category to be assigned to the widget.
+ * LdCategoryView::symbol-selected:
+ * @self: an #LdCategoryView object.
+ * @symbol: the selected #LdSymbol object.
+ * @path: location of the symbol within the library.
  *
- * Create an instance.
+ * A symbol has been selected.
  */
-GtkWidget *
-ld_category_view_new (LdCategory *category)
-{
-	LdCategoryView *self;
-
-	self = g_object_new (LD_TYPE_CATEGORY_VIEW, NULL);
-	ld_category_view_if_set_category (LD_CATEGORY_VIEW_IF (self), category);
-	return GTK_WIDGET (self);
-}
-
-static void
-ld_category_view_set_category (LdCategoryViewIf *iface, LdCategory *category)
-{
-	LdCategoryView *self;
-
-	g_return_if_fail (LD_IS_CATEGORY_VIEW (iface));
-	g_return_if_fail (LD_IS_CATEGORY (category) || category == NULL);
-
-	self = LD_CATEGORY_VIEW (iface);
-	if (self->priv->category)
-	{
-		g_signal_handlers_disconnect_by_func (self->priv->category,
-			reload_category, self);
-		g_object_unref (self->priv->category);
-	}
-
-	self->priv->category = category;
-
-	if (category)
-	{
-		g_signal_connect_data (category, "children-changed",
-			G_CALLBACK (reload_category), self,
-			NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
-		g_signal_connect_data (category, "notify::parent",
-			G_CALLBACK (reload_category), self,
-			NULL, G_CONNECT_AFTER | G_CONNECT_SWAPPED);
-		g_object_ref (category);
-	}
-	reload_category (self);
-	g_object_notify (G_OBJECT (self), "category");
-}
-
-static LdCategory *
-ld_category_view_get_category (LdCategoryViewIf *iface)
-{
-	g_return_val_if_fail (LD_IS_CATEGORY_VIEW (iface), NULL);
-	return LD_CATEGORY_VIEW (iface)->priv->category;
-}
+	iface->symbol_selected_signal = g_signal_new
+		("symbol-selected", G_TYPE_FROM_INTERFACE (iface),
+		G_SIGNAL_RUN_LAST, 0, NULL, NULL,
+		ld_marshal_VOID__OBJECT_STRING,
+		G_TYPE_NONE, 2, LD_TYPE_SYMBOL,
+		G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
 
-static GtkWidget *
-create_empty_label (void)
-{
-	GtkWidget *label;
-	PangoAttrList *attr;
-
-	label = gtk_label_new (_("Empty"));
-	gtk_widget_set_sensitive (label, FALSE);
-	gtk_misc_set_alignment (GTK_MISC (label), 0, 0.5);
-	gtk_misc_set_padding (GTK_MISC (label), 5, 0);
-
-	attr = pango_attr_list_new ();
-	pango_attr_list_change (attr, pango_attr_style_new (PANGO_STYLE_ITALIC));
-	gtk_label_set_attributes (GTK_LABEL (label), attr);
-	pango_attr_list_unref (attr);
-
-	return label;
-}
-
-static void
-reconstruct_prefix (LdCategoryView *self)
-{
-	LdCategory *iter;
-	gchar *start, *end;
-
-	start = g_strdup ("");
-	end   = g_strdup ("");
-
-	for (iter = self->priv->category; iter;
-		iter = ld_category_get_parent (iter))
-	{
-		const gchar *name;
-		gchar *new_start, *new_end, *name_escaped;
-
-		/* Stop at the root category. */
-		if (!strcmp (ld_category_get_name (iter),
-			LD_LIBRARY_IDENTIFIER_SEPARATOR))
-			break;
-
-		name = ld_category_get_human_name (iter);
-		name_escaped = g_markup_escape_text (name, -1);
-
-		new_start = g_strconcat (start, "<small>", NULL);
-		new_end   = g_strconcat (name_escaped, ":</small> ", end, NULL);
-
-		g_free (name_escaped);
-		g_free (start);
-		g_free (end);
-
-		start = new_start;
-		end   = new_end;
-	}
-
-	g_free (self->priv->expander_prefix);
-	self->priv->expander_prefix = g_strconcat (start, end, NULL);
-	g_free (start);
-	g_free (end);
-}
-
-static void
-on_symbol_selected (GObject *source,
-	LdSymbol *symbol, const gchar *path, LdCategoryView *self)
-{
-	g_signal_emit (self, LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->
-		symbol_selected_signal, 0, symbol, path);
-}
+/**
+ * LdCategoryView::symbol-deselected:
+ * @self: an #LdCategoryView object.
+ * @symbol: the deselected #LdSymbol object.
+ * @path: location of the symbol within the library.
+ *
+ * A symbol has been deselected.
+ */
+	iface->symbol_deselected_signal = g_signal_new
+		("symbol-deselected", G_TYPE_FROM_INTERFACE (iface),
+		G_SIGNAL_RUN_LAST, 0, NULL, NULL,
+		ld_marshal_VOID__OBJECT_STRING,
+		G_TYPE_NONE, 2, LD_TYPE_SYMBOL,
+		G_TYPE_STRING | G_SIGNAL_TYPE_STATIC_SCOPE);
 
-static void
-on_symbol_deselected (GObject *source,
-	LdSymbol *symbol, const gchar *path, LdCategoryView *self)
-{
-	g_signal_emit (self, LD_CATEGORY_VIEW_IF_GET_INTERFACE (self)->
-		symbol_deselected_signal, 0, symbol, path);
+/**
+ * LdCategoryView:category:
+ *
+ * The #LdCategory this object retrieves content from.
+ */
+	pspec = g_param_spec_object ("category", "Category",
+		"The symbol category that is shown by this object.",
+		LD_TYPE_CATEGORY, G_PARAM_READWRITE);
+	g_object_interface_install_property (iface, pspec);
 }
 
-static void
-reload_category (LdCategoryView *self)
+/**
+ * ld_category_view_set_category:
+ * @self: an #LdCategorylView object.
+ * @category: the #LdCategory to be assigned to the view.
+ *
+ * Assign an #LdCategory object to the view.
+ */
+void
+ld_category_view_set_category (LdCategoryView *self,
+	LdCategory *category)
 {
 	g_return_if_fail (LD_IS_CATEGORY_VIEW (self));
-
-	/* Clear the container first, if there is already something in it. */
-	gtk_container_foreach (GTK_CONTAINER (self),
-		(GtkCallback) gtk_widget_destroy, NULL);
-
-	/* XXX: We might want to disconnect signal handlers. */
-
-	if (self->priv->category)
-	{
-		GSList *symbols, *children;
-
-		symbols  = (GSList *) ld_category_get_symbols  (self->priv->category);
-		children = (GSList *) ld_category_get_children (self->priv->category);
-
-		if (symbols)
-		{
-			GtkWidget *symbol_view;
-
-			symbol_view = ld_category_symbol_view_new (self->priv->category);
-			gtk_box_pack_start (GTK_BOX (self), symbol_view, FALSE, FALSE, 0);
-
-			g_signal_connect_after (symbol_view, "symbol-selected",
-				G_CALLBACK (on_symbol_selected), self);
-			g_signal_connect_after (symbol_view, "symbol-deselected",
-				G_CALLBACK (on_symbol_deselected), self);
-		}
-
-		if (children)
-		{
-			reconstruct_prefix (self);
-			g_slist_foreach (children, load_category_cb, self);
-		}
-		else if (!symbols)
-			gtk_box_pack_start (GTK_BOX (self),
-				create_empty_label (), FALSE, FALSE, 0);
-	}
+	LD_CATEGORY_VIEW_GET_INTERFACE (self)->set_category (self, category);
 }
 
-static void
-load_category_cb (gpointer data, gpointer user_data)
+/**
+ * ld_category_view_get_category:
+ * @self: an #LdCategoryView object.
+ *
+ * Get the #LdCategory object assigned to this view.
+ * The reference count on the category is not incremented.
+ */
+LdCategory *
+ld_category_view_get_category (LdCategoryView *self)
 {
-	LdCategoryView *self;
-	LdCategory *cat;
-	GtkWidget *expander, *child;
-	gchar *name, *label_markup;
-
-	g_return_if_fail (LD_IS_CATEGORY_VIEW (user_data));
-	g_return_if_fail (LD_IS_CATEGORY (data));
-
-	self = user_data;
-	cat = data;
-
-	name = g_markup_escape_text (ld_category_get_human_name (cat), -1);
-	label_markup = g_strconcat (self->priv->expander_prefix, name, NULL);
-	g_free (name);
-
-	expander = gtk_expander_new (label_markup);
-	gtk_expander_set_expanded (GTK_EXPANDER (expander), TRUE);
-	gtk_expander_set_use_markup (GTK_EXPANDER (expander), TRUE);
-	g_free (label_markup);
-
-	child = ld_category_view_new (cat);
-	gtk_container_add (GTK_CONTAINER (expander), child);
-	gtk_box_pack_start (GTK_BOX (self), expander, FALSE, FALSE, 0);
-
-	g_signal_connect_after (child, "symbol-selected",
-		G_CALLBACK (on_symbol_selected), self);
-	g_signal_connect_after (child, "symbol-deselected",
-		G_CALLBACK (on_symbol_deselected), self);
+	g_return_val_if_fail (LD_IS_CATEGORY_VIEW (self), NULL);
+	return LD_CATEGORY_VIEW_GET_INTERFACE (self)->get_category (self);
 }
-
diff --git a/liblogdiag/ld-category-view.h b/liblogdiag/ld-category-view.h
index b684448..723f78a 100644
--- a/liblogdiag/ld-category-view.h
+++ b/liblogdiag/ld-category-view.h
@@ -2,7 +2,7 @@
  * ld-category-view.h
  *
  * This file is a part of logdiag.
- * Copyright Přemysl Janouch 2011. All rights reserved.
+ * Copyright Přemysl Janouch 2012. All rights reserved.
  *
  * See the file LICENSE for licensing information.
  *
@@ -17,40 +17,40 @@ G_BEGIN_DECLS
 #define LD_TYPE_CATEGORY_VIEW (ld_category_view_get_type ())
 #define LD_CATEGORY_VIEW(obj) (G_TYPE_CHECK_INSTANCE_CAST \
 	((obj), LD_TYPE_CATEGORY_VIEW, LdCategoryView))
-#define LD_CATEGORY_VIEW_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST \
-	((klass), LD_TYPE_CATEGORY_VIEW, LdCategoryViewClass))
 #define LD_IS_CATEGORY_VIEW(obj) (G_TYPE_CHECK_INSTANCE_TYPE \
 	((obj), LD_TYPE_CATEGORY_VIEW))
-#define LD_IS_CATEGORY_VIEW_CLASS(klass) (G_TYPE_CHECK_INSTANCE_TYPE \
-	((klass), LD_TYPE_CATEGORY_VIEW))
-#define LD_CATEGORY_VIEW_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS \
-	((obj), LD_CATEGORY_VIEW, LdCategoryViewClass))
+#define LD_CATEGORY_VIEW_GET_INTERFACE(inst) (G_TYPE_INSTANCE_GET_INTERFACE \
+	((inst), LD_TYPE_CATEGORY_VIEW, LdCategoryViewInterface))
 
 typedef struct _LdCategoryView LdCategoryView;
-typedef struct _LdCategoryViewPrivate LdCategoryViewPrivate;
-typedef struct _LdCategoryViewClass LdCategoryViewClass;
-
+typedef struct _LdCategoryViewInterface LdCategoryViewInterface;
 
 /**
  * LdCategoryView:
  */
 struct _LdCategoryView
 {
-/*< private >*/
-	GtkVBox parent_instance;
-	LdCategoryViewPrivate *priv;
+	/* Just to remind gtk-doc that this really exists. */
 };
 
-struct _LdCategoryViewClass
+struct _LdCategoryViewInterface
 {
 /*< private >*/
-	GtkVBoxClass parent_class;
+	GTypeInterface parent;
+
+	guint symbol_selected_signal;
+	guint symbol_deselected_signal;
+
+	void (*set_category) (LdCategoryView *self, LdCategory *category);
+	LdCategory *(*get_category) (LdCategoryView *self);
 };
 
 
 GType ld_category_view_get_type (void) G_GNUC_CONST;
 
-GtkWidget *ld_category_view_new (LdCategory *category);
+void ld_category_view_set_category (LdCategoryView *self,
+	LdCategory *category);
+LdCategory *ld_category_view_get_category (LdCategoryView *self);
 
 
 G_END_DECLS
diff --git a/liblogdiag/liblogdiag.h b/liblogdiag/liblogdiag.h
index f3ec94b..aeac0a3 100644
--- a/liblogdiag/liblogdiag.h
+++ b/liblogdiag/liblogdiag.h
@@ -28,9 +28,9 @@
 #include "ld-diagram.h"
 
 #include "ld-diagram-view.h"
-#include "ld-category-view-if.h"
-#include "ld-category-symbol-view.h"
 #include "ld-category-view.h"
+#include "ld-category-symbol-view.h"
+#include "ld-category-tree-view.h"
 
 #include "ld-lua.h"
 #include "ld-lua-symbol.h"