Added gal-view-instance.c and gal-view-instance.h.

2002-01-31  Christopher James Lahey  <clahey@ximian.com>

	* Makefile.am: Added gal-view-instance.c and gal-view-instance.h.

	* gal-view-collection.c, gal-view-collection.h
	(gal_view_collection_load_view_from_file): Factored out this
	function so that it can be used outside of gal-view-collection.c.
	(gal_view_collection_get_view_index_by_id,
	gal_view_collection_get_view_id_by_index,
	gal_view_collection_loaded): Added these functions.

	* gal-view-instance.c, gal-view-instance.h: New class representing
	a single folder of a particular type of folder.

svn path=/trunk/; revision=15544

1 files changed, 338 insertions, 0 deletions

diff --git a/widgets/menus/gal-view-instance.c b/widgets/menus/gal-view-instance.c
new file mode 100644
index 0000000000..0deaf91c60
--- /dev/null
+++ b/widgets/menus/gal-view-instance.c
@@ -0,0 +1,338 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/* 
+ * gal-view-instance.c
+ * Copyright 2000, 2001, Ximian, Inc.
+ *
+ * Authors:
+ *   Chris Lahey <clahey@ximian.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License, version 2, as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <config.h>
+
+#include <util/e-i18n.h>
+#include <ctype.h>
+#include <string.h>
+#include <gtk/gtksignal.h>
+#include <gnome-xml/parser.h>
+#include <libgnome/gnome-defs.h>
+#include <libgnome/gnome-util.h>
+#include <gal/util/e-util.h>
+#include <gal/util/e-xml-utils.h>
+#include <gal/widgets/e-unicode.h>
+#include "gal-view-instance.h"
+
+#define GVI_CLASS(e) ((GalViewInstanceClass *)((GtkObject *)e)->klass)
+
+#define PARENT_TYPE gtk_object_get_type ()
+
+static GtkObjectClass *gal_view_instance_parent_class;
+
+enum {
+	DISPLAY_VIEW,
+	CHANGED,
+	LAST_SIGNAL
+};
+
+static guint gal_view_instance_signals [LAST_SIGNAL] = { 0, };
+
+static void
+gal_view_instance_changed (GalViewInstance *instance)
+{
+	g_return_if_fail (instance != NULL);
+	g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));
+
+	gtk_signal_emit (GTK_OBJECT (instance),
+			 gal_view_instance_signals [CHANGED]);
+}
+
+static void
+gal_view_instance_display_view (GalViewInstance *instance, GalView *view)
+{
+	g_return_if_fail (instance != NULL);
+	g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));
+
+	gtk_signal_emit (GTK_OBJECT (instance),
+			 gal_view_instance_signals [DISPLAY_VIEW],
+			 view);
+}
+
+static void
+gal_view_instance_destroy (GtkObject *object)
+{
+	GalViewInstance *instance = GAL_VIEW_INSTANCE(object);
+
+	if (instance->collection)
+		gtk_object_unref (GTK_OBJECT (instance->collection));
+
+	g_free (instance->instance_id);
+	g_free (instance->custom_filename);
+	g_free (instance->current_view_filename);
+
+	g_free (instance->current_title);
+	g_free (instance->current_type);
+	g_free (instance->current_id);
+	if (instance->current_view)
+		gtk_object_unref (GTK_OBJECT (instance->current_view));
+	
+	if (gal_view_instance_parent_class->destroy)
+		(*gal_view_instance_parent_class->destroy)(object);
+}
+
+static void
+gal_view_instance_class_init (GtkObjectClass *object_class)
+{
+	GalViewInstanceClass *klass = GAL_VIEW_INSTANCE_CLASS(object_class);
+	gal_view_instance_parent_class = gtk_type_class (PARENT_TYPE);
+	
+	object_class->destroy = gal_view_instance_destroy;
+
+	gal_view_instance_signals [DISPLAY_VIEW] =
+		gtk_signal_new ("display_view",
+				GTK_RUN_LAST,
+				E_OBJECT_CLASS_TYPE (object_class),
+				GTK_SIGNAL_OFFSET (GalViewInstanceClass, display_view),
+				gtk_marshal_NONE__OBJECT,
+				GTK_TYPE_NONE, 1, GAL_VIEW_TYPE);
+
+	gal_view_instance_signals [CHANGED] =
+		gtk_signal_new ("changed",
+				GTK_RUN_LAST,
+				E_OBJECT_CLASS_TYPE (object_class),
+				GTK_SIGNAL_OFFSET (GalViewInstanceClass, changed),
+				gtk_marshal_NONE__NONE,
+				GTK_TYPE_NONE, 0);
+
+	E_OBJECT_CLASS_ADD_SIGNALS (object_class, gal_view_instance_signals, LAST_SIGNAL);
+
+	klass->display_view = NULL;
+	klass->changed      = NULL;
+}
+
+static void
+gal_view_instance_init (GalViewInstance *instance)
+{
+	instance->collection = NULL;
+
+	instance->instance_id = NULL;
+	instance->custom_filename = NULL;
+	instance->current_view_filename = NULL;
+	
+	instance->current_title = NULL;
+	instance->current_type = NULL;
+	instance->current_id = NULL;
+	instance->current_view = NULL;
+
+}
+
+/**
+ * gal_view_instance_get_type:
+ *
+ */
+guint
+gal_view_instance_get_type (void)
+{
+	static guint type = 0;
+	
+	if (!type)
+	{
+		GtkTypeInfo info =
+		{
+			"GalViewInstance",
+			sizeof (GalViewInstance),
+			sizeof (GalViewInstanceClass),
+			(GtkClassInitFunc) gal_view_instance_class_init,
+			(GtkObjectInitFunc) gal_view_instance_init,
+			/* reserved_1 */ NULL,
+			/* reserved_2 */ NULL,
+			(GtkClassInitFunc) NULL,
+		};
+		
+		type = gtk_type_unique (PARENT_TYPE, &info);
+	}
+
+  return type;
+}
+
+static void
+save_current_view (GalViewInstance *instance)
+{
+	xmlDoc *doc;
+	xmlNode *root;
+
+	doc = xmlNewDoc("1.0");
+	root = xmlNewNode (NULL, "GalViewCurrentView");
+	xmlDocSetRootElement(doc, root);
+
+	if (instance->current_id)
+		e_xml_set_string_prop_by_name (root, "current_view", instance->current_id);
+	if (instance->current_type)
+		e_xml_set_string_prop_by_name (root, "current_view_type", instance->current_type);
+
+	xmlSaveFile(instance->current_view_filename, doc);
+	xmlFreeDoc(doc);
+}
+
+static void
+view_changed (GalView *view, GalViewInstance *instance)
+{
+	if (instance->current_id != NULL) {
+		instance->current_view = NULL;
+		save_current_view (instance);
+		gal_view_instance_changed(instance);
+	}
+
+	gal_view_save (view, instance->custom_filename);
+}
+
+static void
+load_current_view (GalViewInstance *instance)
+{
+	xmlDoc *doc;
+	xmlNode *root;
+
+	doc = xmlParseFile(instance->current_view_filename);
+
+	if (!doc)
+		return;
+
+	root = xmlDocGetRootElement(doc);
+	instance->current_id = e_xml_get_string_prop_by_name_with_default (root, "current_view", NULL);
+	instance->current_type = e_xml_get_string_prop_by_name_with_default (root, "current_view_type", NULL);
+	xmlFreeDoc(doc);
+
+	if (instance->current_id == NULL) {
+		instance->current_view =
+			gal_view_collection_load_view_from_file (instance->collection,
+								 instance->current_type,
+								 instance->custom_filename);
+
+	} else {
+		int index = gal_view_collection_get_view_index_by_id (instance->collection,
+								      instance->current_id);
+		GalView *view = gal_view_collection_get_view (instance->collection,
+							      index);
+		instance->current_view = gal_view_clone(view);
+
+	}
+
+	instance->current_title = g_strdup (gal_view_get_title(instance->current_view));
+	gtk_signal_connect(GTK_OBJECT(instance->current_view), "changed",
+			   GTK_SIGNAL_FUNC(view_changed), instance);
+
+	gal_view_instance_display_view (instance, instance->current_view);
+}
+
+/**
+ * gal_view_instance_new:
+ * @collection: This %GalViewCollection should be loaded before being passed to this function.
+ * @instance_id: Which instance of this type of object is this (for most of evo, this is the folder id.)
+ * 
+ * Create a new %GalViewInstance.
+ * 
+ * Return value: The new %GalViewInstance.
+ **/
+GalViewInstance *
+gal_view_instance_new (GalViewCollection *collection, const char *instance_id)
+{
+	GalViewInstance *instance = gtk_type_new(gal_view_instance_get_type());
+	if (gal_view_instance_construct (instance, collection, instance_id))
+		return instance;
+	else {
+		gtk_object_unref (GTK_OBJECT (instance));
+		return NULL;
+	}
+}
+
+GalViewInstance *
+gal_view_instance_construct (GalViewInstance *instance, GalViewCollection *collection, const char *instance_id)
+{
+	char *filename;
+	char *safe_id;
+
+	g_return_val_if_fail (gal_view_collection_loaded (collection), NULL);
+
+	instance->collection = collection;
+	if (collection)
+		gtk_object_ref (GTK_OBJECT (collection));
+	instance->instance_id = g_strdup (instance_id);
+
+	safe_id = g_strdup (instance->instance_id);
+	e_filename_make_safe (safe_id);
+
+	filename = g_strdup_printf ("custom_view-%s.xml", safe_id);
+	instance->custom_filename = g_concat_dir_and_file (instance->collection->local_dir, filename);
+	g_free (filename);
+
+	filename = g_strdup_printf ("current_view-%s.xml", safe_id);
+	instance->current_view_filename = g_concat_dir_and_file (instance->collection->local_dir, filename);
+	g_free (filename);
+
+	g_free (safe_id);
+
+	load_current_view (instance);
+
+	return instance;
+}
+
+/* Manipulate the current view. */
+char *
+gal_view_instance_get_current_view_id (GalViewInstance *instance)
+{
+	return g_strdup (instance->current_id);
+}
+
+void
+gal_view_instance_set_current_view_id (GalViewInstance *instance, char *view_id)
+{
+	GalView *view;
+	int index;
+
+	g_return_if_fail (instance != NULL);
+	g_return_if_fail (GAL_IS_VIEW_INSTANCE (instance));
+
+	if (instance->current_view && !strcmp (instance->current_id, view_id))
+		return;
+
+	if (instance->current_view) {
+		gtk_object_unref (GTK_OBJECT (instance->current_view));
+	}
+
+	g_free (instance->current_type);
+	g_free (instance->current_title);
+	g_free (instance->current_id);
+
+	index = gal_view_collection_get_view_index_by_id (instance->collection, view_id);
+	view = gal_view_collection_get_view (instance->collection, index);
+
+	instance->current_title = g_strdup (gal_view_get_title(view));
+	instance->current_type = g_strdup (gal_view_get_type_code(view));
+	instance->current_id = g_strdup (view_id);
+	instance->current_view = gal_view_clone(view);
+
+	gtk_signal_connect(GTK_OBJECT(instance->current_view), "changed",
+			   GTK_SIGNAL_FUNC(view_changed), instance);
+
+	save_current_view (instance);
+	gal_view_instance_changed(instance);
+	gal_view_instance_display_view (instance, view);
+}
+
+GalView *
+gal_view_instance_get_current_view (GalViewInstance *instance)
+{
+	return instance->current_view;
+}