[gimp] app: add gimp_prop_angle_range_dial_new()

[Michael Natterer <mitch src gnome org>]

commit 907939edc9569c66f075c983728eebca9528b798
Author: Michael Natterer <mitch gimp org>
Date:   Wed May 28 00:59:44 2014 +0200

    app: add gimp_prop_angle_range_dial_new()
    
    which is by no means general and needs to be improved if ever widely
    used.

 app/widgets/gimppropwidgets.c |   59 +++++++++++++++++++++++++++++++++++++++-
 app/widgets/gimppropwidgets.h |    4 +++
 2 files changed, 61 insertions(+), 2 deletions(-)
---
diff --git a/app/widgets/gimppropwidgets.c b/app/widgets/gimppropwidgets.c
index d6638fc..6414e64 100644
--- a/app/widgets/gimppropwidgets.c
+++ b/app/widgets/gimppropwidgets.c
@@ -739,7 +739,7 @@ deg_to_rad (GBinding     *binding,
   gdouble *lower = user_data;
   gdouble  value = g_value_get_double (from_value);
 
-  if (*lower != 0.0)
+  if (lower && *lower != 0.0)
     {
       if (value < 0.0)
         value += 360.0;
@@ -763,7 +763,7 @@ rad_to_deg (GBinding     *binding,
 
   value *= 180.0 / G_PI;
 
-  if (*lower != 0.0)
+  if (lower && *lower != 0.0)
     {
       if (value > (*lower + 360.0))
         value -= 360.0;
@@ -841,6 +841,61 @@ gimp_prop_angle_dial_new (GObject     *config,
   return dial;
 }
 
+GtkWidget *
+gimp_prop_angle_range_dial_new  (GObject     *config,
+                                 const gchar *alpha_property_name,
+                                 const gchar *beta_property_name,
+                                 const gchar *clockwise_property_name)
+{
+  GParamSpec *alpha_param_spec;
+  GParamSpec *beta_param_spec;
+  GParamSpec *clockwise_param_spec;
+  GtkWidget  *dial;
+
+  alpha_param_spec = find_param_spec (config, alpha_property_name, G_STRFUNC);
+  if (! alpha_param_spec)
+    return NULL;
+
+  beta_param_spec = find_param_spec (config, beta_property_name, G_STRFUNC);
+  if (! beta_param_spec)
+    return NULL;
+
+  clockwise_param_spec = find_param_spec (config, clockwise_property_name, G_STRFUNC);
+  if (! clockwise_param_spec)
+    return NULL;
+
+  dial = gimp_dial_new ();
+
+  g_object_set (dial,
+                "size",         96,
+                "border-width", 0,
+                "background",   GIMP_CIRCLE_BACKGROUND_HSV,
+                NULL);
+
+  g_object_bind_property_full (config, alpha_property_name,
+                               dial,   "alpha",
+                               G_BINDING_BIDIRECTIONAL |
+                               G_BINDING_SYNC_CREATE,
+                               deg_to_rad,
+                               rad_to_deg,
+                               NULL, NULL);
+
+  g_object_bind_property_full (config, beta_property_name,
+                               dial,   "beta",
+                               G_BINDING_BIDIRECTIONAL |
+                               G_BINDING_SYNC_CREATE,
+                               deg_to_rad,
+                               rad_to_deg,
+                               NULL, NULL);
+
+  g_object_bind_property (config, clockwise_property_name,
+                          dial,   "clockwise",
+                          G_BINDING_BIDIRECTIONAL |
+                          G_BINDING_SYNC_CREATE);
+
+  return dial;
+}
+
 
 /**********/
 /*  view  */
diff --git a/app/widgets/gimppropwidgets.h b/app/widgets/gimppropwidgets.h
index 4f9c0bf..e0c7b99 100644
--- a/app/widgets/gimppropwidgets.h
+++ b/app/widgets/gimppropwidgets.h
@@ -68,6 +68,10 @@ void        gimp_prop_widget_set_factor     (GtkWidget     *widget,
 
 GtkWidget * gimp_prop_angle_dial_new        (GObject       *config,
                                              const gchar   *property_name);
+GtkWidget * gimp_prop_angle_range_dial_new  (GObject       *config,
+                                             const gchar   *alpha_property_name,
+                                             const gchar   *beta_property_name,
+                                             const gchar   *clockwise_property_name);
 
 
 /*  GParamObject (GimpViewable)  */