[gnome-photos/wip/rishi/imageview: 2/2] Image Container

[Debarshi Ray <debarshir src gnome org>]

commit d090c28cb895a8bdb5c7e6bb986773b923bdac89
Author: Debarshi Ray <debarshir gnome org>
Date:   Sun Jan 31 19:06:46 2016 +0100

    Image Container

 src/photos-image-container.c |  199 ++++++++++++++++++++++++++++++++++++++++++
 src/photos-image-container.h |   62 +++++++++++++
 2 files changed, 261 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-image-container.c b/src/photos-image-container.c
new file mode 100644
index 0000000..6a91ae1
--- /dev/null
+++ b/src/photos-image-container.c
@@ -0,0 +1,199 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2016 Red Hat, Inc.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <babl/babl.h>
+#include <cairo-gobject.h>
+#include <glib.h>
+
+#include "photos-image-container.h"
+
+
+struct _PhotosImageContainer
+{
+  GtkBin parent_instance;
+  GeglNode *node;
+  GtkWidget *stack;
+  GtkWidget *view;
+  cairo_region_t *bbox_region;
+  cairo_region_t *region;
+};
+
+struct _PhotosImageContainerClass
+{
+  GtkBinClass parent_class;
+};
+
+
+enum
+  {
+    PROP_0,
+    PROP_VIEW
+  };
+
+
+G_DEFINE_TYPE (PhotosImageContainer, photos_image_container, GTK_TYPE_BIN);
+
+
+static void
+photos_image_container_computed (PhotosImageContainer *self, GeglRectangle *rect)
+{
+  cairo_status_t status;
+
+  status = cairo_region_union_rectangle (self->region, (cairo_rectangle_t *) rect);
+  g_assert_cmpint (status, =, CAIRO_STATUS_SUCCESS);
+
+  if (cairo_region_equal (self->bbox_region, self->region))
+    g_message ("compute done");
+}
+
+
+static void
+photos_image_container_notify_node (PhotosImageContainer *self)
+{
+  GeglNode *node;
+
+  node = photos_image_view_get_node (PHOTOS_IMAGE_VIEW (self->view));
+  if (self->node == node)
+    return;
+
+  if (self->node != NULL)
+    g_signal_handlers_disconnect_by_func (self->node, photos_image_container_computed, self);
+
+  g_clear_object (&self->node);
+  g_clear_pointer (&self->bbox_region, (GDestroyNotify) cairo_region_destroy);
+  g_clear_pointer (&self->region, (GDestroyNotify) cairo_region_destroy);
+
+  if (node != NULL)
+    {
+      GeglRectangle bbox;
+
+      g_object_ref (node);
+      g_signal_connect_object (node,
+                               "computed",
+                               G_CALLBACK (photos_image_container_computed),
+                               self,
+                               G_CONNECT_SWAPPED);
+      bbox = gegl_node_get_bounding_box (node);
+      self->bbox_region = cairo_region_create_rectangle ((cairo_rectangle_t *) &bbox);
+      self->region = cairo_region_create ();
+    }
+
+  self->node = node;
+}
+
+
+static void
+photos_image_container_dispose (GObject *object)
+{
+  PhotosImageContainer *self = PHOTOS_IMAGE_CONTAINER (object);
+
+  g_clear_object (&self->node);
+
+  G_OBJECT_CLASS (photos_image_container_parent_class)->dispose (object);
+}
+
+
+static void
+photos_image_container_finalize (GObject *object)
+{
+  PhotosImageContainer *self = PHOTOS_IMAGE_CONTAINER (object);
+
+  g_clear_pointer (&self->bbox_region, (GDestroyNotify) cairo_region_destroy);
+  g_clear_pointer (&self->region, (GDestroyNotify) cairo_region_destroy);
+
+  G_OBJECT_CLASS (photos_image_container_parent_class)->finalize (object);
+}
+
+
+static void
+photos_image_container_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  PhotosImageContainer *self = PHOTOS_IMAGE_CONTAINER (object);
+
+  switch (prop_id)
+    {
+    case PROP_VIEW:
+      g_value_set_object (value, self->view);
+      break;
+    }
+}
+
+
+static void
+photos_image_container_init (PhotosImageContainer *self)
+{
+  GtkStyleContext *context;
+  GtkWidget *sw;
+
+  self->stack = gtk_stack_new ();
+  gtk_widget_set_hexpand (self->stack, TRUE);
+  gtk_widget_set_vexpand (self->stack, TRUE);
+  gtk_container_add (GTK_CONTAINER (self), self->stack);
+
+  sw = gtk_scrolled_window_new (NULL, NULL);
+  gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw), GTK_SHADOW_IN);
+  context = gtk_widget_get_style_context (sw);
+  gtk_style_context_add_class (context, "documents-scrolledwin");
+  gtk_container_add (GTK_CONTAINER (self->stack), sw);
+
+  self->view = photos_image_view_new ();
+  gtk_container_add (GTK_CONTAINER (sw), self->view);
+  g_signal_connect_swapped (self->view, "notify::node", G_CALLBACK (photos_image_container_notify_node), 
self);
+
+  gtk_widget_show_all (sw);
+  gtk_stack_set_visible_child (GTK_STACK (self->stack), sw);
+}
+
+
+static void
+photos_image_container_class_init (PhotosImageContainerClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = photos_image_container_dispose;
+  object_class->finalize = photos_image_container_finalize;
+  object_class->get_property = photos_image_container_get_property;
+  object_class->set_property = photos_image_container_set_property;
+
+  g_object_class_install_property (object_class,
+                                   PROP_VIEW,
+                                   g_param_spec_object ("view",
+                                                        "GtkWidget object",
+                                                        "The view inside this container",
+                                                        GTK_TYPE_WIDGET,
+                                                        G_PARAM_READABLE));
+}
+
+
+GtkWidget *
+photos_image_container_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_IMAGE_CONTAINER, NULL);
+}
+
+
+GtkWidget *
+photos_image_container_get_view (PhotosImageContainer *self)
+{
+  g_return_val_if_fail (PHOTOS_IS_IMAGE_CONTAINER (self), NULL);
+  return self->view;
+}
diff --git a/src/photos-image-container.h b/src/photos-image-container.h
new file mode 100644
index 0000000..7ed90a7
--- /dev/null
+++ b/src/photos-image-container.h
@@ -0,0 +1,62 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2016 Red Hat, Inc.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_IMAGE_CONTAINER_H
+#define PHOTOS_IMAGE_CONTAINER_H
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_IMAGE_CONTAINER (photos_image_container_get_type ())
+
+#define PHOTOS_IMAGE_CONTAINER(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_IMAGE_CONTAINER, PhotosImageContainer))
+
+#define PHOTOS_IMAGE_CONTAINER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_IMAGE_CONTAINER, PhotosImageContainerClass))
+
+#define PHOTOS_IS_IMAGE_CONTAINER(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_IMAGE_CONTAINER))
+
+#define PHOTOS_IS_IMAGE_CONTAINER_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_IMAGE_CONTAINER))
+
+#define PHOTOS_IMAGE_CONTAINER_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_IMAGE_CONTAINER, PhotosImageContainerClass))
+
+typedef struct _PhotosImageContainer      PhotosImageContainer;
+typedef struct _PhotosImageContainerClass PhotosImageContainerClass;
+
+GType               photos_image_container_get_type           (void) G_GNUC_CONST;
+
+GtkWidget          *photos_image_container_new                (void);
+
+GtkWidget          *photos_image_container_get_view           (PhotosImageContainer *self);
+
+G_END_DECLS
+
+#endif /* PHOTOS_IMAGE_CONTAINER_H */