[gtk+] shadow: Add equal and transition support

[Benjamin Otte <otte src gnome org>]

commit c366b5b8b72cc9d87be4e153c2dfc7eb5551c46a
Author: Benjamin Otte <otte redhat com>
Date:   Tue Apr 3 15:33:00 2012 +0200

    shadow: Add equal and transition support
    
    ... and enable transitions for the shadow properties.

 gtk/gtkcssshadowsvalue.c       |   42 ++++++++++++++++++++++++++++++++++++++-
 gtk/gtkcssshadowvalue.c        |   40 +++++++++++++++++++++++++++++++++++--
 gtk/gtkcssshadowvalueprivate.h |    2 +
 gtk/gtkcssstylepropertyimpl.c  |    6 ++--
 4 files changed, 82 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtkcssshadowsvalue.c b/gtk/gtkcssshadowsvalue.c
index 41b521f..d4f7655 100644
--- a/gtk/gtkcssshadowsvalue.c
+++ b/gtk/gtkcssshadowsvalue.c
@@ -31,6 +31,9 @@ struct _GtkCssValue {
   GtkCssValue  *values[1];
 };
 
+static GtkCssValue *    gtk_css_shadows_value_new       (GtkCssValue **values,
+                                                         guint         len);
+
 static void
 gtk_css_value_shadows_free (GtkCssValue *value)
 {
@@ -69,7 +72,42 @@ gtk_css_value_shadows_transition (GtkCssValue *start,
                                   GtkCssValue *end,
                                   double       progress)
 {
-  return NULL;
+  GtkCssValue *result;
+  guint i;
+
+  /* catches the important case of 2 none values */
+  if (start == end)
+    return _gtk_css_value_ref (start);
+
+  if (start->len > end->len)
+    result = gtk_css_shadows_value_new (start->values, start->len);
+  else
+    result = gtk_css_shadows_value_new (end->values, end->len);
+
+  for (i = 0; i < MIN (start->len, end->len); i++)
+    {
+      result->values[i] = _gtk_css_value_transition (start->values[i], end->values[i], progress);
+    }
+  if (start->len > end->len)
+    {
+      for (; i < result->len; i++)
+        {
+          GtkCssValue *fill = _gtk_css_shadow_value_new_for_transition (start->values[i]);
+          result->values[i] = _gtk_css_value_transition (start->values[i], fill, progress);
+          _gtk_css_value_unref (fill);
+        }
+    }
+  else
+    {
+      for (; i < result->len; i++)
+        {
+          GtkCssValue *fill = _gtk_css_shadow_value_new_for_transition (end->values[i]);
+          result->values[i] = _gtk_css_value_transition (fill, end->values[i], progress);
+          _gtk_css_value_unref (fill);
+        }
+    }
+
+  return result;
 }
 
 static void
@@ -107,7 +145,7 @@ _gtk_css_shadows_value_new_none (void)
   return _gtk_css_value_ref (&none_singleton);
 }
 
-GtkCssValue *
+static GtkCssValue *
 gtk_css_shadows_value_new (GtkCssValue **values,
                            guint         len)
 {
diff --git a/gtk/gtkcssshadowvalue.c b/gtk/gtkcssshadowvalue.c
index 26806ed..e9cbd4d 100644
--- a/gtk/gtkcssshadowvalue.c
+++ b/gtk/gtkcssshadowvalue.c
@@ -40,6 +40,13 @@ struct _GtkCssValue {
   GtkCssValue *color;
 };
 
+static GtkCssValue *    gtk_css_shadow_value_new (GtkCssValue *hoffset,
+                                                  GtkCssValue *voffset,
+                                                  GtkCssValue *radius,
+                                                  GtkCssValue *spread,
+                                                  gboolean     inset,
+                                                  GtkCssValue *color);
+
 static void
 gtk_css_value_shadow_free (GtkCssValue *shadow)
 {
@@ -56,8 +63,12 @@ static gboolean
 gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
                             const GtkCssValue *shadow2)
 {
-  /* FIXME */
-  return shadow1 == shadow2;
+  return shadow1->inset == shadow2->inset
+      && _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
+      && _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
+      && _gtk_css_value_equal (shadow1->radius, shadow2->radius)
+      && _gtk_css_value_equal (shadow1->spread, shadow2->spread)
+      && _gtk_css_value_equal (shadow1->color, shadow2->color);
 }
 
 static GtkCssValue *
@@ -65,7 +76,15 @@ gtk_css_value_shadow_transition (GtkCssValue *start,
                                  GtkCssValue *end,
                                  double       progress)
 {
-  return NULL;
+  if (start->inset != end->inset)
+    return NULL;
+
+  return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, progress),
+                                   _gtk_css_value_transition (start->voffset, end->voffset, progress),
+                                   _gtk_css_value_transition (start->radius, end->radius, progress),
+                                   _gtk_css_value_transition (start->spread, end->spread, progress),
+                                   start->inset,
+                                   _gtk_css_value_transition (start->color, end->color, progress));
 }
 
 static void
@@ -125,6 +144,21 @@ gtk_css_shadow_value_new (GtkCssValue *hoffset,
   return retval;
 }                  
 
+GtkCssValue *
+_gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
+{
+  GdkRGBA transparent = { 0, 0, 0, 0 };
+
+  g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
+
+  return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
+                                   _gtk_css_number_value_new (0, GTK_CSS_PX),
+                                   _gtk_css_number_value_new (0, GTK_CSS_PX),
+                                   _gtk_css_number_value_new (0, GTK_CSS_PX),
+                                   target->inset,
+                                   _gtk_css_rgba_value_new_from_rgba (&transparent));
+}
+
 static gboolean
 value_is_done_parsing (GtkCssParser *parser)
 {
diff --git a/gtk/gtkcssshadowvalueprivate.h b/gtk/gtkcssshadowvalueprivate.h
index a53badd..3683e11 100644
--- a/gtk/gtkcssshadowvalueprivate.h
+++ b/gtk/gtkcssshadowvalueprivate.h
@@ -30,6 +30,8 @@
 
 G_BEGIN_DECLS
 
+GtkCssValue *   _gtk_css_shadow_value_new_for_transition (GtkCssValue           *target);
+
 GtkCssValue *   _gtk_css_shadow_value_parse           (GtkCssParser             *parser);
 
 GtkCssValue *   _gtk_css_shadow_value_compute         (GtkCssValue              *shadow,
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index dc814ca..0fb7127 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -1330,7 +1330,7 @@ _gtk_css_style_property_init_properties (void)
   gtk_css_style_property_register        ("text-shadow",
                                           GTK_CSS_PROPERTY_TEXT_SHADOW,
                                           G_TYPE_NONE,
-                                          GTK_STYLE_PROPERTY_INHERIT,
+                                          GTK_STYLE_PROPERTY_INHERIT | GTK_STYLE_PROPERTY_ANIMATED,
                                           shadow_value_parse,
                                           NULL,
                                           shadow_value_compute,
@@ -1342,7 +1342,7 @@ _gtk_css_style_property_init_properties (void)
   gtk_css_style_property_register        ("icon-shadow",
                                           GTK_CSS_PROPERTY_ICON_SHADOW,
                                           G_TYPE_NONE,
-                                          GTK_STYLE_PROPERTY_INHERIT,
+                                          GTK_STYLE_PROPERTY_INHERIT | GTK_STYLE_PROPERTY_ANIMATED,
                                           shadow_value_parse,
                                           NULL,
                                           shadow_value_compute,
@@ -1354,7 +1354,7 @@ _gtk_css_style_property_init_properties (void)
   gtk_css_style_property_register        ("box-shadow",
                                           GTK_CSS_PROPERTY_BOX_SHADOW,
                                           G_TYPE_NONE,
-                                          0,
+                                          GTK_STYLE_PROPERTY_ANIMATED,
                                           shadow_value_parse,
                                           NULL,
                                           shadow_value_compute,