[gthumb] histogram view: save and restore the scale type

[Paolo Bacchilega <paobac src gnome org>]

commit 398d01470c8f5b514116eadbb03198b34f558a3e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Dec 28 21:36:29 2013 +0100

    histogram view: save and restore the scale type

 data/org.gnome.gthumb.image-viewer.gschema.xml.in |    3 ++
 extensions/image_viewer/gth-image-histogram.c     |   26 +++++++++++++++++++++
 extensions/image_viewer/preferences.h             |    1 +
 3 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.gthumb.image-viewer.gschema.xml.in 
b/data/org.gnome.gthumb.image-viewer.gschema.xml.in
index 335517a..2c27abc 100644
--- a/data/org.gnome.gthumb.image-viewer.gschema.xml.in
+++ b/data/org.gnome.gthumb.image-viewer.gschema.xml.in
@@ -29,6 +29,9 @@
       <default>true</default>
       <_description>Whether to reset the scrollbars position after changing image</_description>
     </key>
+    <key name="histogram-scale" enum="org.gnome.gthumb.GthHistogramScale">
+      <default>'linear'</default>
+    </key>
   </schema>
 
 </schemalist>
diff --git a/extensions/image_viewer/gth-image-histogram.c b/extensions/image_viewer/gth-image-histogram.c
index 7798f80..fc1a4fb 100644
--- a/extensions/image_viewer/gth-image-histogram.c
+++ b/extensions/image_viewer/gth-image-histogram.c
@@ -25,6 +25,7 @@
 #include <gthumb.h>
 #include "gth-image-histogram.h"
 #include "gth-image-viewer-page.h"
+#include "preferences.h"
 
 
 #define MIN_HISTOGRAM_HEIGHT 280
@@ -126,8 +127,24 @@ gth_image_histogram_gth_property_view_interface_init (GthPropertyViewInterface *
 
 
 static void
+histogram_view_notify_scale_type_cb (GObject    *gobject,
+                                    GParamSpec *pspec,
+                                    gpointer    user_data)
+{
+       GthImageHistogram *self = user_data;
+       GSettings         *settings;
+
+       settings = g_settings_new (GTHUMB_IMAGE_VIEWER_SCHEMA);
+       g_settings_set_enum (settings, PREF_IMAGE_VIEWER_HISTOGRAM_SCALE, gth_histogram_view_get_scale_type 
(GTH_HISTOGRAM_VIEW (self->priv->histogram_view)));
+       g_object_unref (settings);
+}
+
+
+static void
 gth_image_histogram_init (GthImageHistogram *self)
 {
+       GSettings *settings;
+
        self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GTH_TYPE_IMAGE_HISTOGRAM, GthImageHistogramPrivate);
        self->priv->histogram = gth_histogram_new ();
 
@@ -135,9 +152,18 @@ gth_image_histogram_init (GthImageHistogram *self)
        gtk_box_set_spacing (GTK_BOX (self), 6);
        gtk_container_set_border_width (GTK_CONTAINER (self), 2);
 
+       settings = g_settings_new (GTHUMB_IMAGE_VIEWER_SCHEMA);
+
        self->priv->histogram_view = gth_histogram_view_new (self->priv->histogram);
        gth_histogram_view_show_info (GTH_HISTOGRAM_VIEW (self->priv->histogram_view), TRUE);
+       gth_histogram_view_set_scale_type (GTH_HISTOGRAM_VIEW (self->priv->histogram_view), 
g_settings_get_enum (settings, PREF_IMAGE_VIEWER_HISTOGRAM_SCALE));
        gtk_widget_set_size_request (self->priv->histogram_view, -1, MIN_HISTOGRAM_HEIGHT);
        gtk_widget_show (self->priv->histogram_view);
        gtk_box_pack_start (GTK_BOX (self), self->priv->histogram_view, FALSE, FALSE, 0);
+       g_signal_connect (self->priv->histogram_view,
+                         "notify::scale-type",
+                         G_CALLBACK (histogram_view_notify_scale_type_cb),
+                         self);
+
+       g_object_unref (settings);
 }
diff --git a/extensions/image_viewer/preferences.h b/extensions/image_viewer/preferences.h
index 23411f5..e8cfbe9 100644
--- a/extensions/image_viewer/preferences.h
+++ b/extensions/image_viewer/preferences.h
@@ -33,6 +33,7 @@
 #define PREF_IMAGE_VIEWER_ZOOM_QUALITY      "zoom-quality"
 #define PREF_IMAGE_VIEWER_ZOOM_CHANGE       "zoom-change"
 #define PREF_IMAGE_VIEWER_RESET_SCROLLBARS  "reset-scrollbars"
+#define PREF_IMAGE_VIEWER_HISTOGRAM_SCALE   "histogram-scale"
 
 void image_viewer__dlg_preferences_construct_cb (GtkWidget  *dialog,
                                                 GthBrowser *browser,