general: Make property extensions gtk version independentnew-properties-extension

Nautilus property extensions to add property pages to the property
dialog was providing a GtkWidget to be modified by extensions.

This makes the extension need to target a specific gtk version, which
with the new gtk versioning might be hard to provide, and it's quite a
bad practice since it requires everyone to be on top of any gtk update.
This is currently holding the work for porting Nautilus to gtk4, since
the Totem extension depends on us having the same gtk+ version, which is
unlikely.

This work makes the extension for providing property extensions not
depend on gtk by providing a plain struct to be filled with data that
later on Nautilus will layout on the UI.

See https://gitlab.gnome.org/GNOME/nautilus/issues/276

1 files changed, 250 insertions, 0 deletions

diff --git a/extensions/image-properties/nautilus-image-properties-page-model-provider.c b/extensions/image-properties/nautilus-image-properties-page-model-provider.c
new file mode 100644
index 000000000..cf55f1094
--- /dev/null
+++ b/extensions/image-properties/nautilus-image-properties-page-model-provider.c
@@ -0,0 +1,250 @@
+/* Copyright (C) 2004 Red Hat, Inc
+ * Copyright (c) 2007 Novell, Inc.
+ * Copyright (c) 2017 Thomas Bechtold <thomasbechtold@jpberlin.de>
+ * Copyright (c) 2018 Ernestas Kulik <ernestask@gnome.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Alexander Larsson <alexl@redhat.com>
+ * XMP support by Hubert Figuiere <hfiguiere@novell.com>
+ */
+
+#include "nautilus-image-properties-page-model-provider.h"
+#include "nautilus-image-properties-page-model.h"
+#include <glib/gi18n.h>
+#include <nautilus-extension.h>
+
+#define NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_NAME "NautilusImagePropertiesPageModel::property_page"
+
+struct _NautilusImagePropertiesPageModelProvider
+{
+    GObject parent_instance;
+
+    NautilusPropertyPageModel *page_model;
+    GList *files;
+};
+
+enum
+{
+    PROP_0,
+    PROP_PAGE_MODEL,
+    PROP_FILES,
+    N_PROPERTIES
+};
+
+static void property_page_provider_iface_init (NautilusPropertyPageModelProviderInterface *iface);
+
+G_DEFINE_DYNAMIC_TYPE_EXTENDED (NautilusImagePropertiesPageModelProvider,
+                                nautilus_image_properties_page_model_provider,
+                                G_TYPE_OBJECT,
+                                0,
+                                G_IMPLEMENT_INTERFACE_DYNAMIC (NAUTILUS_TYPE_PROPERTY_PAGE_MODEL_PROVIDER,
+                                                               property_page_provider_iface_init))
+
+static gboolean
+is_mime_type_supported (const char *mime_type)
+{
+    g_autoptr (GSList) formats = NULL;
+
+    if (mime_type == NULL)
+    {
+        return FALSE;
+    }
+
+    formats = gdk_pixbuf_get_formats ();
+
+    for (GSList *l = formats; l != NULL; l = l->next)
+    {
+        g_auto (GStrv) mime_types = NULL;
+
+        mime_types = gdk_pixbuf_format_get_mime_types (l->data);
+        if (mime_types == NULL)
+        {
+            continue;
+        }
+
+        if (g_strv_contains ((const char *const *) mime_types, mime_type))
+        {
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+static NautilusPropertyPageModel*
+get_model (NautilusPropertyPageModelProvider *provider)
+{
+    NautilusImagePropertiesPageModelProvider *self;
+
+    self = NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_PROVIDER (provider);
+
+    return self->page_model;
+}
+
+static void
+set_files (NautilusPropertyPageModelProvider *provider,
+           GList                             *files)
+{
+    NautilusImagePropertiesPageModelProvider *self;
+    NautilusFileInfo *file_info;
+    g_autofree char *mime_type = NULL;
+
+    self = NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_PROVIDER (provider);
+
+    if (self->files != NULL)
+    {
+        g_list_free_full (self->files, g_object_unref);
+        self->files = NULL;
+    }
+
+    self->files = g_list_copy_deep (files,
+                                    (GCopyFunc) g_object_ref, NULL);
+
+    if (self->files == NULL || self->files->next != NULL)
+    {
+        return;
+    }
+
+    file_info = NAUTILUS_FILE_INFO (self->files->data);
+    mime_type = nautilus_file_info_get_mime_type (file_info);
+    if (!is_mime_type_supported (mime_type))
+    {
+        return;
+    }
+
+    nautilus_image_properties_page_model_load_from_file_info (NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL (self->page_model),
+                                                        file_info);
+}
+
+static gboolean
+supports_files (NautilusPropertyPageModelProvider *provider)
+{
+    g_autofree char *mime_type = NULL;
+    NautilusFileInfo *file_info;
+    NautilusImagePropertiesPageModelProvider *self;
+
+    self = NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_PROVIDER (provider);
+    if (self->files == NULL || self->files->next != NULL)
+    {
+        return FALSE;
+    }
+
+    file_info = NAUTILUS_FILE_INFO (self->files->data);
+    mime_type = nautilus_file_info_get_mime_type (file_info);
+    if (!is_mime_type_supported (mime_type))
+    {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static void
+nautilus_image_properties_page_model_provider_get_property (GObject    *object,
+                                                      guint       prop_id,
+                                                      GValue     *value,
+                                                      GParamSpec *pspec)
+{
+    NautilusImagePropertiesPageModelProvider *self = NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_PROVIDER (object);
+    switch (prop_id)
+    {
+        case PROP_PAGE_MODEL:
+        {
+            g_value_set_object (value, self->page_model);
+        }
+        break;
+
+        case PROP_FILES:
+        {
+            g_value_set_pointer (value, self->files);
+        }
+        break;
+
+        default:
+        {
+            g_assert_not_reached ();
+        }
+    }
+}
+
+static void
+nautilus_image_properties_page_model_provider_set_property (GObject    *object,
+                                                      guint       prop_id,
+                                                      const GValue     *value,
+                                                      GParamSpec *pspec)
+{
+    NautilusImagePropertiesPageModelProvider *self = NAUTILUS_IMAGE_PROPERTIES_PAGE_MODEL_PROVIDER (object);
+    switch (prop_id)
+    {
+        case PROP_PAGE_MODEL:
+        {
+            g_clear_object (&self->page_model);
+            self->page_model = NAUTILUS_PROPERTY_PAGE_MODEL (g_value_get_object (value));
+        }
+        break;
+
+        case PROP_FILES:
+        {
+            set_files (NAUTILUS_PROPERTY_PAGE_MODEL_PROVIDER (self),
+                       g_value_get_pointer (value));
+        }
+        break;
+
+        default:
+        {
+            g_assert_not_reached ();
+        }
+    }
+}
+
+static void
+property_page_provider_iface_init (NautilusPropertyPageModelProviderInterface *iface)
+{
+    iface->get_model = get_model;
+    iface->set_files = set_files;
+    iface->supports_files = supports_files;
+
+}
+
+static void
+nautilus_image_properties_page_model_provider_init (NautilusImagePropertiesPageModelProvider *self)
+{
+    self->page_model = NAUTILUS_PROPERTY_PAGE_MODEL (nautilus_image_properties_page_model_new ());
+}
+
+static void
+nautilus_image_properties_page_model_provider_class_init (NautilusImagePropertiesPageModelProviderClass *klass)
+{
+    GObjectClass *oclass;
+
+    oclass = G_OBJECT_CLASS (klass);
+    oclass->get_property = nautilus_image_properties_page_model_provider_get_property;
+    oclass->set_property = nautilus_image_properties_page_model_provider_set_property;
+
+    g_object_class_override_property (oclass, PROP_PAGE_MODEL, "page-model");
+    g_object_class_override_property (oclass, PROP_FILES, "files");
+}
+
+static void
+nautilus_image_properties_page_model_provider_class_finalize (NautilusImagePropertiesPageModelProviderClass *klass)
+{
+    (void) klass;
+}
+
+void
+nautilus_image_properties_page_model_provider_load (GTypeModule *module)
+{
+    nautilus_image_properties_page_model_provider_register_type (module);
+}