1 files changed, 550 insertions, 0 deletions
diff --git a/liblogdiag/ld-diagram.c b/liblogdiag/ld-diagram.c
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+++ b/liblogdiag/ld-diagram.c
@@ -0,0 +1,550 @@
+/*
+ * ld-diagram.c
+ *
+ * This file is a part of logdiag.
+ * Copyright Přemysl Janouch 2010 - 2011. All rights reserved.
+ *
+ * See the file LICENSE for licensing information.
+ *
+ */
+
+#include "liblogdiag.h"
+#include "config.h"
+
+
+/**
+ * SECTION:ld-diagram
+ * @short_description: A diagram object.
+ * @see_also: #LdCanvas
+ *
+ * #LdDiagram is a model used for storing diagrams.
+ */
+
+/*
+ * LdDiagramPrivate:
+ * @modified: Whether the diagram has been modified.
+ * @objects: All objects in the diagram.
+ * @selection: All currently selected objects.
+ * @connections: Connections between objects.
+ */
+struct _LdDiagramPrivate
+{
+	gboolean modified;
+
+	GList *objects;
+	GList *selection;
+	GList *connections;
+};
+
+enum
+{
+	PROP_0,
+	PROP_MODIFIED
+};
+
+static void ld_diagram_get_property (GObject *object, guint property_id,
+	GValue *value, GParamSpec *pspec);
+static void ld_diagram_set_property (GObject *object, guint property_id,
+	const GValue *value, GParamSpec *pspec);
+static void ld_diagram_dispose (GObject *gobject);
+static void ld_diagram_finalize (GObject *gobject);
+
+static gboolean write_signature (GOutputStream *stream, GError **error);
+
+static void ld_diagram_real_changed (LdDiagram *self);
+static void ld_diagram_clear_internal (LdDiagram *self);
+static void ld_diagram_unselect_all_internal (LdDiagram *self);
+
+
+G_DEFINE_TYPE (LdDiagram, ld_diagram, G_TYPE_OBJECT);
+
+static void
+ld_diagram_class_init (LdDiagramClass *klass)
+{
+	GObjectClass *object_class;
+	GParamSpec *pspec;
+
+	object_class = G_OBJECT_CLASS (klass);
+	object_class->get_property = ld_diagram_get_property;
+	object_class->set_property = ld_diagram_set_property;
+	object_class->dispose = ld_diagram_dispose;
+	object_class->finalize = ld_diagram_finalize;
+
+	klass->changed = ld_diagram_real_changed;
+
+/**
+ * LdDiagram:modified:
+ *
+ * Whether the diagram has been modified.
+ */
+	pspec = g_param_spec_boolean ("modified", "Modified",
+		"Whether the diagram has been modified.",
+		FALSE, G_PARAM_READWRITE);
+	g_object_class_install_property (object_class, PROP_MODIFIED, pspec);
+
+/**
+ * LdDiagram::changed:
+ * @diagram: The diagram object.
+ *
+ * Contents of the diagram have changed.
+ */
+	klass->changed_signal = g_signal_new
+		("changed", G_TYPE_FROM_CLASS (klass),
+		G_SIGNAL_RUN_LAST,
+		G_STRUCT_OFFSET (LdDiagramClass, changed), NULL, NULL,
+		g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+
+/**
+ * LdDiagram::selection-changed:
+ * @diagram: The diagram object.
+ *
+ * The current selection has changed.
+ */
+	klass->selection_changed_signal = g_signal_new
+		("selection-changed", G_TYPE_FROM_CLASS (klass),
+		G_SIGNAL_RUN_LAST,
+		G_STRUCT_OFFSET (LdDiagramClass, selection_changed), NULL, NULL,
+		g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+
+	g_type_class_add_private (klass, sizeof (LdDiagramPrivate));
+}
+
+static void
+ld_diagram_init (LdDiagram *self)
+{
+	self->priv = G_TYPE_INSTANCE_GET_PRIVATE
+		(self, LD_TYPE_DIAGRAM, LdDiagramPrivate);
+}
+
+static void
+ld_diagram_get_property (GObject *object, guint property_id,
+	GValue *value, GParamSpec *pspec)
+{
+	LdDiagram *self;
+
+	self = LD_DIAGRAM (object);
+	switch (property_id)
+	{
+	case PROP_MODIFIED:
+		g_value_set_boolean (value, ld_diagram_get_modified (self));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+static void
+ld_diagram_set_property (GObject *object, guint property_id,
+	const GValue *value, GParamSpec *pspec)
+{
+	LdDiagram *self;
+
+	self = LD_DIAGRAM (object);
+	switch (property_id)
+	{
+	case PROP_MODIFIED:
+		ld_diagram_set_modified (self, g_value_get_boolean (value));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+	}
+}
+
+static void
+ld_diagram_dispose (GObject *gobject)
+{
+	LdDiagram *self;
+
+	self = LD_DIAGRAM (gobject);
+	ld_diagram_clear_internal (self);
+
+	/* Chain up to the parent class. */
+	G_OBJECT_CLASS (ld_diagram_parent_class)->dispose (gobject);
+}
+
+static void
+ld_diagram_finalize (GObject *gobject)
+{
+	/* Chain up to the parent class. */
+	G_OBJECT_CLASS (ld_diagram_parent_class)->finalize (gobject);
+}
+
+static void
+ld_diagram_real_changed (LdDiagram *self)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+
+	ld_diagram_set_modified (self, TRUE);
+}
+
+
+/**
+ * ld_diagram_new:
+ *
+ * Create an instance.
+ */
+LdDiagram *
+ld_diagram_new (void)
+{
+	return g_object_new (LD_TYPE_DIAGRAM, NULL);
+}
+
+/**
+ * ld_diagram_clear:
+ * @self: An #LdDiagram object.
+ *
+ * Clear the whole diagram with it's objects and selection.
+ */
+void
+ld_diagram_clear (LdDiagram *self)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+
+	ld_diagram_clear_internal (self);
+
+	g_signal_emit (self,
+		LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
+}
+
+/*
+ * ld_diagram_clear_internal:
+ * @self: An #LdDiagram object.
+ *
+ * Do the same as ld_diagram_clear() does but don't emit signals.
+ */
+static void
+ld_diagram_clear_internal (LdDiagram *self)
+{
+	ld_diagram_unselect_all (self);
+
+	g_list_free (self->priv->connections);
+	self->priv->connections = NULL;
+
+	g_list_foreach (self->priv->objects, (GFunc) g_object_unref, NULL);
+	g_list_free (self->priv->objects);
+	self->priv->objects = NULL;
+}
+
+/**
+ * ld_diagram_load_from_file:
+ * @self: An #LdDiagram object.
+ * @filename: A filename.
+ * @error: Return location for a GError, or NULL.
+ *
+ * Load a file into the diagram.
+ *
+ * Return value: TRUE if the file could be loaded, FALSE otherwise.
+ */
+gboolean
+ld_diagram_load_from_file (LdDiagram *self,
+	const gchar *filename, GError **error)
+{
+	JsonParser *parser;
+	GError *json_error;
+
+	g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
+	g_return_val_if_fail (filename != NULL, FALSE);
+
+	/* TODO: Implement loading for real. This is just a stub. */
+	parser = json_parser_new ();
+
+	json_error = NULL;
+	json_parser_load_from_file (parser, filename, &json_error);
+	if (json_error)
+	{
+		g_propagate_error (error, json_error);
+		g_object_unref (parser);
+		return FALSE;
+	}
+
+	ld_diagram_clear (self);
+	g_object_unref (parser);
+	return TRUE;
+}
+
+/**
+ * ld_diagram_save_to_file:
+ * @self: An #LdDiagram object.
+ * @filename: A filename.
+ * @error: Return location for a GError, or NULL.
+ *
+ * Save the diagram into a file.
+ *
+ * Return value: TRUE if the diagram could be saved, FALSE otherwise.
+ */
+gboolean
+ld_diagram_save_to_file (LdDiagram *self,
+	const gchar *filename, GError **error)
+{
+	GFile *file;
+	GFileOutputStream *file_stream;
+	JsonGenerator *generator;
+	JsonNode *root;
+	GError *local_error;
+
+	g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
+	g_return_val_if_fail (filename != NULL, FALSE);
+
+	file = g_file_new_for_path (filename);
+
+	local_error = NULL;
+	file_stream = g_file_replace (file, NULL, FALSE,
+		G_FILE_CREATE_NONE, NULL, &local_error);
+	g_object_unref (file);
+
+	if (local_error)
+	{
+		g_propagate_error (error, local_error);
+		return FALSE;
+	}
+
+	local_error = NULL;
+	write_signature (G_OUTPUT_STREAM (file_stream), &local_error);
+	if (local_error)
+	{
+		g_object_unref (file_stream);
+		g_propagate_error (error, local_error);
+		return FALSE;
+	}
+
+	/* TODO: Implement saving for real. This is just a stub. */
+	generator = json_generator_new ();
+	g_object_set (generator, "pretty", TRUE, NULL);
+
+	/* XXX: json-glib dislikes empty objects. */
+	root = json_node_new (JSON_NODE_OBJECT);
+	json_generator_set_root (generator, root);
+	json_node_free (root);
+
+	local_error = NULL;
+	json_generator_to_stream (generator, G_OUTPUT_STREAM (file_stream),
+		NULL, &local_error);
+	g_object_unref (file_stream);
+	g_object_unref (generator);
+
+	if (local_error)
+	{
+		g_propagate_error (error, local_error);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static gboolean
+write_signature (GOutputStream *stream, GError **error)
+{
+	static const gchar signature[] = "/* logdiag diagram */\n";
+	GError *local_error = NULL;
+
+	g_output_stream_write (stream, signature, sizeof (signature) - 1,
+		NULL, &local_error);
+	if (local_error)
+	{
+		g_propagate_error (error, local_error);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * ld_diagram_get_modified:
+ * @self: An #LdDiagram object.
+ *
+ * Return value: The modification status of diagram.
+ */
+gboolean
+ld_diagram_get_modified (LdDiagram *self)
+{
+	g_return_val_if_fail (LD_IS_DIAGRAM (self), FALSE);
+	return self->priv->modified;
+}
+
+/**
+ * ld_diagram_set_modified:
+ * @self: An #LdDiagram object.
+ * @value: Whether the diagram has been modified.
+ *
+ * Set the modification status of diagram.
+ */
+void
+ld_diagram_set_modified (LdDiagram *self, gboolean value)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+	self->priv->modified = value;
+
+	g_object_notify (G_OBJECT (self), "modified");
+}
+
+/**
+ * ld_diagram_get_objects:
+ * @self: An #LdDiagram object.
+ *
+ * Get a list of objects in the diagram. Do not modify.
+ */
+GList *
+ld_diagram_get_objects (LdDiagram *self)
+{
+	g_return_val_if_fail (LD_IS_DIAGRAM (self), NULL);
+	return self->priv->objects;
+}
+
+/**
+ * ld_diagram_insert_object:
+ * @self: An #LdDiagram object.
+ * @object: The object to be inserted.
+ * @pos: The position at which the object is to be inserted.
+ *       Negative values will append to the end.
+ *
+ * Insert an object into the diagram.
+ */
+void
+ld_diagram_insert_object (LdDiagram *self, LdDiagramObject *object, gint pos)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+	g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
+
+	if (!g_list_find (self->priv->objects, object))
+	{
+		self->priv->objects =
+			g_list_insert (self->priv->objects, object, pos);
+		g_object_ref (object);
+
+		g_signal_emit (self,
+			LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
+	}
+}
+
+/**
+ * ld_diagram_remove_object:
+ * @self: An #LdDiagram object.
+ * @object: The object to be removed.
+ *
+ * Remove an object from the diagram.
+ */
+void
+ld_diagram_remove_object (LdDiagram *self, LdDiagramObject *object)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+	g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
+
+	if (g_list_find (self->priv->objects, object))
+	{
+		ld_diagram_selection_remove (self, object);
+
+		self->priv->objects = g_list_remove (self->priv->objects, object);
+		g_object_unref (object);
+
+		g_signal_emit (self,
+			LD_DIAGRAM_GET_CLASS (self)->changed_signal, 0);
+	}
+}
+
+/**
+ * ld_diagram_get_selection:
+ * @self: An #LdDiagram object.
+ *
+ * Get a list of objects that are currently selected in the diagram.
+ * Do not modify.
+ */
+GList *
+ld_diagram_get_selection (LdDiagram *self)
+{
+	g_return_val_if_fail (LD_IS_DIAGRAM (self), NULL);
+	return self->priv->selection;
+}
+
+/**
+ * ld_diagram_selection_add:
+ * @self: An #LdDiagram object.
+ * @object: The object to be added to the selection.
+ * @pos: The position at which the object is to be inserted.
+ *       Negative values will append to the end.
+ *
+ * Add an object to selection.
+ */
+void
+ld_diagram_selection_add (LdDiagram *self, LdDiagramObject *object, gint pos)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+	g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
+
+	g_return_if_fail (g_list_find (self->priv->objects, object) != NULL);
+
+	if (!g_list_find (self->priv->selection, object))
+	{
+		self->priv->selection =
+			g_list_insert (self->priv->selection, object, pos);
+		g_object_ref (object);
+
+		g_signal_emit (self,
+			LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
+	}
+}
+
+/**
+ * ld_diagram_selection_remove:
+ * @self: An #LdDiagram object.
+ * @object: The object to be removed from the selection.
+ *
+ * Remove an object from the selection.
+ */
+void
+ld_diagram_selection_remove (LdDiagram *self, LdDiagramObject *object)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+	g_return_if_fail (LD_IS_DIAGRAM_OBJECT (object));
+
+	if (g_list_find (self->priv->selection, object))
+	{
+		self->priv->selection = g_list_remove (self->priv->selection, object);
+		g_object_unref (object);
+
+		g_signal_emit (self,
+			LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
+	}
+}
+
+/**
+ * ld_diagram_select_all:
+ * @self: An #LdDiagram object.
+ *
+ * Include all objects in the document to the selection.
+ */
+void
+ld_diagram_select_all (LdDiagram *self)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+
+	ld_diagram_unselect_all_internal (self);
+
+	self->priv->selection = g_list_copy (self->priv->objects);
+	g_list_foreach (self->priv->selection, (GFunc) g_object_ref, NULL);
+
+	g_signal_emit (self,
+		LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
+}
+
+/**
+ * ld_diagram_unselect_all:
+ * @self: An #LdDiagram object.
+ *
+ * Remove all objects from the current selection.
+ */
+void
+ld_diagram_unselect_all (LdDiagram *self)
+{
+	g_return_if_fail (LD_IS_DIAGRAM (self));
+
+	ld_diagram_unselect_all_internal (self);
+
+	g_signal_emit (self,
+		LD_DIAGRAM_GET_CLASS (self)->selection_changed_signal, 0);
+}
+
+static void
+ld_diagram_unselect_all_internal (LdDiagram *self)
+{
+	g_list_foreach (self->priv->selection, (GFunc) g_object_unref, NULL);
+	g_list_free (self->priv->selection);
+	self->priv->selection = NULL;
+}