[gnome-photos] Add PhotosLoadMoreButton

[Debarshi Ray <debarshir src gnome org>]

commit 512d395906645e0bffcc0c6e7a1dcd2c80d76a5e
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Aug 11 17:10:25 2012 +0200

    Add PhotosLoadMoreButton

 po/POTFILES.in                |    1 +
 src/Makefile.am               |    2 +
 src/photos-load-more-button.c |  158 +++++++++++++++++++++++++++++++++++++++++
 src/photos-load-more-button.h |   73 +++++++++++++++++++
 4 files changed, 234 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 9b484f7..ce913e1 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -4,6 +4,7 @@ data/gnome-photos.desktop.in.in
 data/org.gnome.photos.gschema.xml.in
 src/gd-main-toolbar.c
 src/photos-application.c
+src/photos-load-more-button.c
 src/photos-main-toolbar.c
 src/photos-main-window.c
 src/photos-search-type-manager.c
diff --git a/src/Makefile.am b/src/Makefile.am
index d0c89a8..ef50cc4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -43,6 +43,8 @@ gnome_photos_SOURCES = \
 	photos-item-manager.h \
 	photos-item-model.c \
 	photos-item-model.h \
+	photos-load-more-button.c \
+	photos-load-more-button.h \
 	photos-local-item.c \
 	photos-local-item.h \
 	photos-main-toolbar.c \
diff --git a/src/photos-load-more-button.c b/src/photos-load-more-button.c
new file mode 100644
index 0000000..423313d
--- /dev/null
+++ b/src/photos-load-more-button.c
@@ -0,0 +1,158 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 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 <glib.h>
+#include <glib/gi18n.h>
+#include <glib/gprintf.h>
+
+#include "photos-load-more-button.h"
+#include "photos-offset-controller.h"
+
+
+struct _PhotosLoadMoreButtonPrivate
+{
+  PhotosOffsetController *offset_cntrlr;
+  gboolean block;
+  gulong offset_cntrlr_id;
+};
+
+
+G_DEFINE_TYPE (PhotosLoadMoreButton, photos_load_more_button, GTK_TYPE_BUTTON);
+
+
+static void
+photos_load_more_button_count_changed (PhotosOffsetController *offset_cntrlr, gint count, gpointer user_data)
+{
+  PhotosLoadMoreButton *self = PHOTOS_LOAD_MORE_BUTTON (user_data);
+  gchar *label;
+  gint remaining;
+  gint step;
+
+  remaining = photos_offset_controller_get_remaining (offset_cntrlr);
+  step = photos_offset_controller_get_step (offset_cntrlr);
+  if (remaining <= 0 || self->priv->block)
+    {
+      gtk_widget_hide (GTK_WIDGET (self));
+      return;
+    }
+
+  if (remaining > step)
+    remaining = step;
+
+  if (remaining == 1)
+    label = g_strdup (_("Load 1 more photo"));
+  else
+    label = g_strdup_printf (_("Load %d more photos"), remaining);
+
+  gtk_button_set_label (GTK_BUTTON (self), label);
+  g_free (label);
+
+  gtk_widget_show (GTK_WIDGET (self));
+}
+
+
+static void
+photos_load_more_button_clicked (GtkButton *button)
+{
+  PhotosLoadMoreButton *self = PHOTOS_LOAD_MORE_BUTTON (button);
+  photos_offset_controller_increase_offset (self->priv->offset_cntrlr);
+}
+
+
+static void
+photos_load_more_button_dispose (GObject *object)
+{
+  PhotosLoadMoreButton *self = PHOTOS_LOAD_MORE_BUTTON (object);
+  PhotosLoadMoreButtonPrivate *priv = self->priv;
+
+  if (priv->offset_cntrlr_id != 0)
+    {
+      g_signal_handler_disconnect (priv->offset_cntrlr, priv->offset_cntrlr_id);
+      priv->offset_cntrlr_id = 0;
+    }
+
+  g_clear_object (&self->priv->offset_cntrlr);
+
+  G_OBJECT_CLASS (photos_load_more_button_parent_class)->dispose (object);
+}
+
+
+static void
+photos_load_more_button_init (PhotosLoadMoreButton *self)
+{
+  PhotosLoadMoreButtonPrivate *priv;
+  GtkStyleContext *context;
+  gint count;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, PHOTOS_TYPE_LOAD_MORE_BUTTON, PhotosLoadMoreButtonPrivate);
+  priv = self->priv;
+
+  gtk_widget_set_no_show_all (GTK_WIDGET (self), TRUE);
+  context = gtk_widget_get_style_context (GTK_WIDGET (self));
+  gtk_style_context_add_class (context, "documents-load-more");
+
+  priv->offset_cntrlr = photos_offset_controller_new ();
+  priv->offset_cntrlr_id = g_signal_connect (priv->offset_cntrlr,
+                                            "count-changed",
+                                            G_CALLBACK (photos_load_more_button_count_changed),
+                                            self);
+
+  count = photos_offset_controller_get_count (priv->offset_cntrlr);
+  photos_load_more_button_count_changed (priv->offset_cntrlr, count, self);
+}
+
+
+static void
+photos_load_more_button_class_init (PhotosLoadMoreButtonClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkButtonClass *button_class = GTK_BUTTON_CLASS (class);
+
+  object_class->dispose = photos_load_more_button_dispose;
+  button_class->clicked = photos_load_more_button_clicked;
+
+  g_type_class_add_private (class, sizeof (PhotosLoadMoreButtonPrivate));
+}
+
+
+GtkWidget *
+photos_load_more_button_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_LOAD_MORE_BUTTON, NULL);
+}
+
+
+void
+photos_load_more_button_set_block (PhotosLoadMoreButton *self, gboolean block)
+{
+  PhotosLoadMoreButtonPrivate *priv = self->priv;
+  gint count;
+
+  if (priv->block == block)
+    return;
+
+  priv->block = block;
+
+  count = photos_offset_controller_get_count (priv->offset_cntrlr);
+  photos_load_more_button_count_changed (priv->offset_cntrlr, count, self);
+}
diff --git a/src/photos-load-more-button.h b/src/photos-load-more-button.h
new file mode 100644
index 0000000..0708f41
--- /dev/null
+++ b/src/photos-load-more-button.h
@@ -0,0 +1,73 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 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_LOAD_MORE_BUTTON_H
+#define PHOTOS_LOAD_MORE_BUTTON_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_LOAD_MORE_BUTTON (photos_load_more_button_get_type ())
+
+#define PHOTOS_LOAD_MORE_BUTTON(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_LOAD_MORE_BUTTON, PhotosLoadMoreButton))
+
+#define PHOTOS_LOAD_MORE_BUTTON_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_LOAD_MORE_BUTTON, PhotosLoadMoreButtonClass))
+
+#define PHOTOS_IS_LOAD_MORE_BUTTON(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_LOAD_MORE_BUTTON))
+
+#define PHOTOS_IS_LOAD_MORE_BUTTON_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_LOAD_MORE_BUTTON))
+
+#define PHOTOS_LOAD_MORE_BUTTON_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_LOAD_MORE_BUTTON, PhotosLoadMoreButtonClass))
+
+typedef struct _PhotosLoadMoreButton        PhotosLoadMoreButton;
+typedef struct _PhotosLoadMoreButtonClass   PhotosLoadMoreButtonClass;
+typedef struct _PhotosLoadMoreButtonPrivate PhotosLoadMoreButtonPrivate;
+
+struct _PhotosLoadMoreButton
+{
+  GtkButton parent_instance;
+  PhotosLoadMoreButtonPrivate *priv;
+};
+
+struct _PhotosLoadMoreButtonClass
+{
+  GtkButtonClass parent_class;
+};
+
+GType                  photos_load_more_button_get_type               (void) G_GNUC_CONST;
+
+GtkWidget             *photos_load_more_button_new                    (void);
+
+void                   photos_load_more_button_set_block              (PhotosLoadMoreButton *self, gboolean block);
+
+G_END_DECLS
+
+#endif /* PHOTOS_LOAD_MORE_BUTTON_H */