[gimp] app: add a menu of kelvin presets to GEGL properties with unit "kelvin"

[Michael Natterer <mitch src gnome org>]

commit 65b46244c7157dbe55f1f9e4bcd6013728b3346b
Author: Michael Natterer <mitch gimp org>
Date:   Sun Jun 1 20:58:21 2014 +0200

    app: add a menu of kelvin presets to GEGL properties with unit "kelvin"
    
    Values taken from http://en.wikipedia.org/wiki/Color_temperature

 app/widgets/gimppropgui.c |  139 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 137 insertions(+), 2 deletions(-)
---
diff --git a/app/widgets/gimppropgui.c b/app/widgets/gimppropgui.c
index 46393d7..8021dd2 100644
--- a/app/widgets/gimppropgui.c
+++ b/app/widgets/gimppropgui.c
@@ -44,6 +44,7 @@
 #include "gimppropgui.h"
 #include "gimppropgui-constructors.h"
 #include "gimppropwidgets.h"
+#include "gimpwidgets-utils.h"
 
 #include "gimp-intl.h"
 
@@ -51,8 +52,10 @@
 #define HAS_KEY(p,k,v) gimp_gegl_param_spec_has_key (p, k, v)
 
 
-static void   gimp_prop_widget_new_seed_clicked (GtkButton       *button,
-                                                 GtkAdjustment   *adj);
+static GtkWidget * gimp_prop_kelvin_presets_new      (GObject       *config,
+                                                      const gchar   *property_name);
+static void        gimp_prop_widget_new_seed_clicked (GtkButton     *button,
+                                                      GtkAdjustment *adj);
 
 
 /*  public functions  */
@@ -187,6 +190,22 @@ gimp_prop_widget_new (GObject               *config,
 
           widget = hbox;
         }
+      else if (HAS_KEY (pspec, "unit", "kelvin"))
+        {
+          GtkWidget *hbox;
+          GtkWidget *button;
+
+          hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
+
+          gtk_box_pack_start (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
+          gtk_widget_show (widget);
+
+          button = gimp_prop_kelvin_presets_new (config, pspec->name);
+          gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+          gtk_widget_show (button);
+
+          widget = hbox;
+        }
     }
   else if (G_IS_PARAM_SPEC_STRING (pspec))
     {
@@ -359,6 +378,122 @@ gimp_prop_gui_new (GObject              *config,
 /*  private functions  */
 
 static void
+gimp_prop_kelvin_presets_menu_position (GtkMenu  *menu,
+                                        gint     *x,
+                                        gint     *y,
+                                        gboolean *push_in,
+                                        gpointer  user_data)
+{
+  gimp_button_menu_position (user_data, menu, GTK_POS_LEFT, x, y);
+}
+
+static gboolean
+gimp_prop_kelvin_presets_button_press (GtkWidget      *widget,
+                                       GdkEventButton *bevent,
+                                       GtkMenu        *menu)
+{
+  if (bevent->type == GDK_BUTTON_PRESS)
+    {
+      gtk_menu_popup (menu,
+                      NULL, NULL,
+                      gimp_prop_kelvin_presets_menu_position, widget,
+                      bevent->button, bevent->time);
+    }
+
+  return TRUE;
+}
+
+static void
+gimp_prop_kelvin_presets_activate (GtkWidget *widget,
+                                   GObject   *config)
+{
+  const gchar *property_name;
+  gdouble     *kelvin;
+
+  property_name = g_object_get_data (G_OBJECT (widget), "property-name");
+  kelvin        = g_object_get_data (G_OBJECT (widget), "kelvin");
+
+  if (property_name && kelvin)
+    g_object_set (config, property_name, *kelvin, NULL);
+}
+
+static GtkWidget *
+gimp_prop_kelvin_presets_new (GObject     *config,
+                              const gchar *property_name)
+{
+  GtkWidget *button;
+  GtkWidget *menu;
+  gint       i;
+
+  const struct
+  {
+    gdouble      kelvin;
+    const gchar *label;
+  }
+  kelvin_presets[] =
+  {
+    { 1700, N_("1,700 K – Match flame") },
+    { 1850, N_("1,850 K – Candle flame, sunset/sunrise") },
+    { 3000, N_("3,000 K – Soft (or warm) white compact fluorescent lamps") },
+    { 3000, N_("3,300 K – Incandescent lamps") },
+    { 3200, N_("3,200 K – Studio lamps, photofloods, etc.") },
+    { 3350, N_("3,350 K – Studio \"CP\" light") },
+    { 4100, N_("4,100 K – Moonlight") },
+    { 5000, N_("5,000 K – D50") },
+    { 5000, N_("5,000 K – Cool white/daylight compact fluorescent lamps") },
+    { 5000, N_("5,000 K – Horizon daylight") },
+    { 5500, N_("5,500 K – D55") },
+    { 5500, N_("5,500 K – Vertical daylight, electronic flash") },
+    { 6200, N_("6,200 K – Xenon short-arc lamp") },
+    { 6500, N_("6,500 K – D65") },
+    { 6500, N_("6,500 K – Daylight, overcast") },
+    { 7500, N_("7,500 K – D75") },
+    { 9300, N_("9,300 K") }
+  };
+
+  button = gtk_button_new ();
+  gtk_widget_set_can_focus (button, FALSE);
+  gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
+
+  gtk_button_set_image (GTK_BUTTON (button),
+                        gtk_image_new_from_icon_name (GIMP_STOCK_MENU_LEFT,
+                                                      GTK_ICON_SIZE_MENU));
+
+  menu = gtk_menu_new ();
+  gtk_menu_attach_to_widget (GTK_MENU (menu), button, NULL);
+
+  g_signal_connect (button, "button-press-event",
+                    G_CALLBACK (gimp_prop_kelvin_presets_button_press),
+                    menu);
+
+  for (i = 0; i < G_N_ELEMENTS (kelvin_presets); i++)
+    {
+      GtkWidget *item;
+      gdouble   *kelvin;
+
+      item = gtk_menu_item_new_with_label (gettext (kelvin_presets[i].label));
+      gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
+      gtk_widget_show (item);
+
+      g_object_set_data_full (G_OBJECT (item), "property-name",
+                              g_strdup (property_name), (GDestroyNotify) g_free);
+
+      kelvin = g_new (gdouble, 1);
+      *kelvin = kelvin_presets[i].kelvin;
+
+      g_object_set_data_full (G_OBJECT (item), "kelvin",
+                              kelvin, (GDestroyNotify) g_free);
+
+      g_signal_connect (item, "activate",
+                        G_CALLBACK (gimp_prop_kelvin_presets_activate),
+                        config);
+
+    }
+
+  return button;
+}
+
+static void
 gimp_prop_widget_new_seed_clicked (GtkButton     *button,
                                    GtkAdjustment *adj)
 {