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[gnome-photos] Add PhotosPreviewNavButtons

commit b37fe36a13d761d85d8fae8c5b840d53aaa473c0
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Jul 31 19:53:52 2013 +0200

    Add PhotosPreviewNavButtons
    
    Fixes: https://bugzilla.gnome.org/696794

 src/Makefile.am                  |    2 +
 src/photos-preview-nav-buttons.c |  449 ++++++++++++++++++++++++++++++++++++++
 src/photos-preview-nav-buttons.h |   87 ++++++++
 3 files changed, 538 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index b6cdd74..5bff585 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -128,6 +128,8 @@ gnome_photos_SOURCES = \
        photos-organize-collection-model.h \
        photos-organize-collection-view.c \
        photos-organize-collection-view.h \
+       photos-preview-nav-buttons.c \
+       photos-preview-nav-buttons.h \
        photos-preview-view.c \
        photos-preview-view.h \
        photos-print-operation.c \
diff --git a/src/photos-preview-nav-buttons.c b/src/photos-preview-nav-buttons.c
new file mode 100644
index 0000000..40e2918
--- /dev/null
+++ b/src/photos-preview-nav-buttons.c
@@ -0,0 +1,449 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2013 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.
+ */
+
+/* Based on code from:
+ *   + Documents
+ */
+
+
+#include "config.h"
+
+#include <glib.h>
+#include <glib/gi18n.h>
+
+#include "photos-item-manager.h"
+#include "photos-preview-nav-buttons.h"
+#include "photos-view-model.h"
+
+
+struct _PhotosPreviewNavButtonsPrivate
+{
+  GtkTreeModel *model;
+  GtkTreePath *current_path;
+  GtkWidget *next_widget;
+  GtkWidget *overlay;
+  GtkWidget *prev_widget;
+  GtkWidget *preview_view;
+  PhotosBaseManager *item_mngr;
+  gboolean hover;
+  gboolean visible;
+  guint auto_hide_id;
+  guint motion_id;
+};
+
+enum
+{
+  PROP_0,
+  PROP_OVERLAY,
+  PROP_PREVIEW_VIEW
+};
+
+
+G_DEFINE_TYPE (PhotosPreviewNavButtons, photos_preview_nav_buttons, G_TYPE_OBJECT);
+
+
+static void
+photos_preview_nav_buttons_fade_in_button (PhotosPreviewNavButtons *self, GtkWidget *widget)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  if (priv->model == NULL || priv->current_path == NULL)
+    return;
+
+  gtk_widget_show_all (widget);
+  gtk_widget_set_opacity (widget, 1.0);
+}
+
+
+static void
+photos_preview_nav_buttons_fade_out_button (PhotosPreviewNavButtons *self, GtkWidget *widget)
+{
+  gtk_widget_set_opacity (widget, 0.0);
+  gtk_widget_hide (widget);
+}
+
+
+static gboolean
+photos_preview_nav_buttons_auto_hide (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  photos_preview_nav_buttons_fade_out_button (self, priv->prev_widget);
+  photos_preview_nav_buttons_fade_out_button (self, priv->next_widget);
+  priv->auto_hide_id = 0;
+  return G_SOURCE_REMOVE;
+}
+
+
+static void
+photos_preview_nav_buttons_unqueue_auto_hide (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  if (priv->auto_hide_id == 0)
+    return;
+
+  g_source_remove (priv->auto_hide_id);
+  priv->auto_hide_id = 0;
+}
+
+
+static gboolean
+photos_preview_nav_buttons_enter_notify (PhotosPreviewNavButtons *self)
+{
+  self->priv->hover = TRUE;
+  photos_preview_nav_buttons_unqueue_auto_hide (self);
+  return FALSE;
+}
+
+
+static void
+photos_preview_nav_buttons_queue_auto_hide (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  photos_preview_nav_buttons_unqueue_auto_hide (self);
+  priv->auto_hide_id = g_timeout_add_seconds_full (G_PRIORITY_DEFAULT,
+                                                   2,
+                                                   (GSourceFunc) photos_preview_nav_buttons_auto_hide,
+                                                   g_object_ref (self),
+                                                   g_object_unref);
+}
+
+
+static gboolean
+photos_preview_nav_buttons_leave_notify (PhotosPreviewNavButtons *self)
+{
+  self->priv->hover = FALSE;
+  photos_preview_nav_buttons_queue_auto_hide (self);
+  return FALSE;
+}
+
+
+static void
+photos_preview_nav_buttons_update_visibility (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+  GtkTreeIter iter;
+  GtkTreeIter tmp;
+
+  if (priv->model == NULL
+      || priv->current_path == NULL
+      || !priv->visible
+      || !gtk_tree_model_get_iter (priv->model, &iter, priv->current_path))
+    {
+      photos_preview_nav_buttons_fade_out_button (self, priv->prev_widget);
+      photos_preview_nav_buttons_fade_out_button (self, priv->next_widget);
+      return;
+    }
+
+  tmp = iter;
+  if (gtk_tree_model_iter_previous (priv->model, &tmp))
+      photos_preview_nav_buttons_fade_in_button (self, priv->prev_widget);
+  else
+      photos_preview_nav_buttons_fade_out_button (self, priv->prev_widget);
+
+  tmp = iter;
+  if (gtk_tree_model_iter_next (priv->model, &tmp))
+      photos_preview_nav_buttons_fade_in_button (self, priv->next_widget);
+  else
+      photos_preview_nav_buttons_fade_out_button (self, priv->next_widget);
+
+  if (!priv->hover)
+    photos_preview_nav_buttons_queue_auto_hide (self);
+}
+
+
+static gboolean
+photos_preview_nav_buttons_motion_notify_timeout (PhotosPreviewNavButtons *self)
+{
+  self->priv->motion_id = 0;
+  photos_preview_nav_buttons_update_visibility (self);
+  return G_SOURCE_REMOVE;
+}
+
+
+static gboolean
+photos_preview_nav_buttons_motion_notify (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  if (priv->motion_id != 0)
+    return FALSE;
+
+  priv->motion_id = g_idle_add_full (G_PRIORITY_DEFAULT,
+                                     (GSourceFunc) photos_preview_nav_buttons_motion_notify_timeout,
+                                     g_object_ref (self),
+                                     g_object_unref);
+  return FALSE;
+}
+
+
+static void
+photos_preview_nav_buttons_next_clicked (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+  GtkTreeIter iter;
+  PhotosBaseItem *item;
+  gchar *id;
+
+  gtk_tree_path_next (priv->current_path);
+  gtk_tree_model_get_iter (priv->model, &iter, priv->current_path);
+  gtk_tree_model_get (priv->model, &iter, PHOTOS_VIEW_MODEL_URN, &id, -1);
+
+  item = PHOTOS_BASE_ITEM (photos_base_manager_get_object_by_id (priv->item_mngr, id));
+  photos_base_manager_set_active_object (priv->item_mngr, G_OBJECT (item));
+
+  g_free (id);
+}
+
+
+static void
+photos_preview_nav_buttons_prev_clicked (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+  GtkTreeIter iter;
+  PhotosBaseItem *item;
+  gchar *id;
+
+  gtk_tree_path_prev (priv->current_path);
+  gtk_tree_model_get_iter (priv->model, &iter, priv->current_path);
+  gtk_tree_model_get (priv->model, &iter, PHOTOS_VIEW_MODEL_URN, &id, -1);
+
+  item = PHOTOS_BASE_ITEM (photos_base_manager_get_object_by_id (priv->item_mngr, id));
+  photos_base_manager_set_active_object (priv->item_mngr, G_OBJECT (item));
+
+  g_free (id);
+}
+
+
+static void
+photos_preview_nav_buttons_dispose (GObject *object)
+{
+  PhotosPreviewNavButtons *self = PHOTOS_PREVIEW_NAV_BUTTONS (object);
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  g_clear_object (&priv->model);
+  g_clear_object (&priv->overlay);
+  g_clear_object (&priv->preview_view);
+  g_clear_object (&priv->item_mngr);
+
+  G_OBJECT_CLASS (photos_preview_nav_buttons_parent_class)->dispose (object);
+}
+
+
+static void
+photos_preview_nav_buttons_finalize (GObject *object)
+{
+  PhotosPreviewNavButtons *self = PHOTOS_PREVIEW_NAV_BUTTONS (object);
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  g_clear_pointer (&priv->current_path, (GDestroyNotify) gtk_tree_path_free);
+
+  G_OBJECT_CLASS (photos_preview_nav_buttons_parent_class)->finalize (object);
+}
+
+
+static void
+photos_preview_nav_buttons_constructed (GObject *object)
+{
+  PhotosPreviewNavButtons *self = PHOTOS_PREVIEW_NAV_BUTTONS (object);
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+  GtkStyleContext *context;
+  GtkWidget *image;
+  gboolean is_rtl;
+  const gchar *next_icon_name;
+  const gchar *prev_icon_name;
+
+  G_OBJECT_CLASS (photos_preview_nav_buttons_parent_class)->constructed (object);
+
+  is_rtl = (gtk_widget_get_direction (priv->preview_view) == GTK_TEXT_DIR_RTL);
+  prev_icon_name = is_rtl ? "go-next-symbolic" : "go-previous-symbolic";
+  next_icon_name = is_rtl ? "go-previous-symbolic" : "go-next-symbolic";
+
+  image = gtk_image_new_from_icon_name (prev_icon_name, GTK_ICON_SIZE_INVALID);
+  gtk_image_set_pixel_size (GTK_IMAGE (image), 16);
+
+  priv->prev_widget = gtk_button_new ();
+  gtk_widget_set_halign (priv->prev_widget, GTK_ALIGN_START);
+  gtk_widget_set_margin_left (priv->prev_widget, 30);
+  gtk_widget_set_margin_right (priv->prev_widget, 30);
+  gtk_widget_set_valign (priv->prev_widget, GTK_ALIGN_CENTER);
+  gtk_container_add (GTK_CONTAINER (priv->prev_widget), image);
+  gtk_overlay_add_overlay (GTK_OVERLAY (priv->overlay), priv->prev_widget);
+  context = gtk_widget_get_style_context (priv->prev_widget);
+  gtk_style_context_add_class (context, "osd");
+  g_signal_connect_swapped (priv->prev_widget,
+                            "clicked",
+                            G_CALLBACK (photos_preview_nav_buttons_prev_clicked),
+                            self);
+  g_signal_connect_swapped (priv->prev_widget,
+                            "enter-notify-event",
+                            G_CALLBACK (photos_preview_nav_buttons_enter_notify),
+                            self);
+  g_signal_connect_swapped (priv->prev_widget,
+                            "leave-notify-event",
+                            G_CALLBACK (photos_preview_nav_buttons_leave_notify),
+                            self);
+
+  image = gtk_image_new_from_icon_name (next_icon_name, GTK_ICON_SIZE_INVALID);
+  gtk_image_set_pixel_size (GTK_IMAGE (image), 16);
+
+  priv->next_widget = gtk_button_new ();
+  gtk_widget_set_halign (priv->next_widget, GTK_ALIGN_END);
+  gtk_widget_set_margin_left (priv->next_widget, 30);
+  gtk_widget_set_margin_right (priv->next_widget, 30);
+  gtk_widget_set_valign (priv->next_widget, GTK_ALIGN_CENTER);
+  gtk_container_add (GTK_CONTAINER (priv->next_widget), image);
+  gtk_overlay_add_overlay (GTK_OVERLAY (priv->overlay), priv->next_widget);
+  context = gtk_widget_get_style_context (priv->next_widget);
+  gtk_style_context_add_class (context, "osd");
+  g_signal_connect_swapped (priv->next_widget,
+                            "clicked",
+                            G_CALLBACK (photos_preview_nav_buttons_next_clicked),
+                            self);
+  g_signal_connect_swapped (priv->next_widget,
+                            "enter-notify-event",
+                            G_CALLBACK (photos_preview_nav_buttons_enter_notify),
+                            self);
+  g_signal_connect_swapped (priv->next_widget,
+                            "leave-notify-event",
+                            G_CALLBACK (photos_preview_nav_buttons_leave_notify),
+                            self);
+
+  g_signal_connect_swapped (priv->overlay,
+                            "motion-notify-event",
+                            G_CALLBACK (photos_preview_nav_buttons_motion_notify),
+                            self);
+}
+
+
+static void
+photos_preview_nav_buttons_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec 
*pspec)
+{
+  PhotosPreviewNavButtons *self = PHOTOS_PREVIEW_NAV_BUTTONS (object);
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  switch (prop_id)
+    {
+    case PROP_OVERLAY:
+      priv->overlay = GTK_WIDGET (g_value_dup_object (value));
+      break;
+
+    case PROP_PREVIEW_VIEW:
+      priv->preview_view = GTK_WIDGET (g_value_dup_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+
+static void
+photos_preview_nav_buttons_init (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, PHOTOS_TYPE_PREVIEW_NAV_BUTTONS, 
PhotosPreviewNavButtonsPrivate);
+  priv = self->priv;
+
+  priv->item_mngr = photos_item_manager_new ();
+}
+
+
+static void
+photos_preview_nav_buttons_class_init (PhotosPreviewNavButtonsClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->constructed = photos_preview_nav_buttons_constructed;
+  object_class->dispose = photos_preview_nav_buttons_dispose;
+  object_class->finalize = photos_preview_nav_buttons_finalize;
+  object_class->set_property = photos_preview_nav_buttons_set_property;
+
+  g_object_class_install_property (object_class,
+                                   PROP_OVERLAY,
+                                   g_param_spec_object ("overlay",
+                                                        "GtkOverlay object",
+                                                        "The stack overlay widget",
+                                                        GTK_TYPE_OVERLAY,
+                                                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_PREVIEW_VIEW,
+                                   g_param_spec_object ("preview-view",
+                                                        "PhotosPreviewView object",
+                                                        "The widget used for showing the preview",
+                                                        PHOTOS_TYPE_PREVIEW_VIEW,
+                                                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
+
+  g_type_class_add_private (class, sizeof (PhotosPreviewNavButtonsPrivate));
+}
+
+
+PhotosPreviewNavButtons *
+photos_preview_nav_buttons_new (PhotosPreviewView *preview_view, GtkOverlay *overlay)
+{
+  return g_object_new (PHOTOS_TYPE_PREVIEW_NAV_BUTTONS, "preview-view", preview_view, "overlay", overlay, 
NULL);
+}
+
+
+void
+photos_preview_nav_buttons_hide (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  priv->visible = FALSE;
+  photos_preview_nav_buttons_fade_out_button (self, priv->prev_widget);
+  photos_preview_nav_buttons_fade_out_button (self, priv->next_widget);
+}
+
+
+void
+photos_preview_nav_buttons_set_model (PhotosPreviewNavButtons *self, GtkTreeModel *model, GtkTreePath 
*current_path)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  if (priv->model == model && gtk_tree_path_compare (priv->current_path, current_path) == 0)
+    return;
+
+  g_clear_object (&priv->model);
+  if (model != NULL)
+    priv->model = g_object_ref (model);
+
+  g_clear_pointer (&priv->current_path, (GDestroyNotify) gtk_tree_path_free);
+  if (current_path != NULL)
+    priv->current_path = gtk_tree_path_copy (current_path);
+
+  photos_preview_nav_buttons_update_visibility (self);
+}
+
+
+void
+photos_preview_nav_buttons_show (PhotosPreviewNavButtons *self)
+{
+  PhotosPreviewNavButtonsPrivate *priv = self->priv;
+
+  priv->visible = TRUE;
+  photos_preview_nav_buttons_fade_in_button (self, priv->prev_widget);
+  photos_preview_nav_buttons_fade_in_button (self, priv->next_widget);
+}
diff --git a/src/photos-preview-nav-buttons.h b/src/photos-preview-nav-buttons.h
new file mode 100644
index 0000000..514ee43
--- /dev/null
+++ b/src/photos-preview-nav-buttons.h
@@ -0,0 +1,87 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2013 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.
+ */
+
+/* Based on code from:
+ *   + Documents
+ */
+
+#ifndef PHOTOS_PREVIEW_NAV_BUTTONS_H
+#define PHOTOS_PREVIEW_NAV_BUTTONS_H
+
+#include <glib-object.h>
+#include <gtk/gtk.h>
+
+#include "photos-preview-view.h"
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_PREVIEW_NAV_BUTTONS (photos_preview_nav_buttons_get_type ())
+
+#define PHOTOS_PREVIEW_NAV_BUTTONS(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_PREVIEW_NAV_BUTTONS, PhotosPreviewNavButtons))
+
+#define PHOTOS_PREVIEW_NAV_BUTTONS_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_PREVIEW_VIEW, PhotosPreviewNavButtonsClass))
+
+#define PHOTOS_IS_PREVIEW_VIEW(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_PREVIEW_VIEW))
+
+#define PHOTOS_IS_PREVIEW_NAV_BUTTONS_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_PREVIEW_VIEW))
+
+#define PHOTOS_PREVIEW_NAV_BUTTONS_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_PREVIEW_VIEW, PhotosPreviewNavButtonsClass))
+
+typedef struct _PhotosPreviewNavButtons        PhotosPreviewNavButtons;
+typedef struct _PhotosPreviewNavButtonsClass   PhotosPreviewNavButtonsClass;
+typedef struct _PhotosPreviewNavButtonsPrivate PhotosPreviewNavButtonsPrivate;
+
+struct _PhotosPreviewNavButtons
+{
+  GObject parent_instance;
+  PhotosPreviewNavButtonsPrivate *priv;
+};
+
+struct _PhotosPreviewNavButtonsClass
+{
+  GObjectClass parent_class;
+};
+
+GType                       photos_preview_nav_buttons_get_type           (void) G_GNUC_CONST;
+
+PhotosPreviewNavButtons    *photos_preview_nav_buttons_new                (PhotosPreviewView *preview_view,
+                                                                           GtkOverlay *overlay);
+
+void                        photos_preview_nav_buttons_hide               (PhotosPreviewNavButtons *self);
+
+void                        photos_preview_nav_buttons_set_model          (PhotosPreviewNavButtons *self,
+                                                                           GtkTreeModel *model,
+                                                                           GtkTreePath *current_path);
+
+void                        photos_preview_nav_buttons_show               (PhotosPreviewNavButtons *self);
+
+G_END_DECLS
+
+#endif /* PHOTOS_PREVIEW_NAV_BUTTONS_H */
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