[gtk-theme-engine-clearlooks] Render thinner trough in GtkScale widgets.

[Carlos Garnacho <carlosg src gnome org>]

commit 68a69e8ba645e915bb12e7c6fe1592e2c4d89a23
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jan 19 04:29:11 2011 +0100

    Render thinner trough in GtkScale widgets.

 src/adwaita_engine.c |   49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/src/adwaita_engine.c b/src/adwaita_engine.c
index 1323457..a55f276 100644
--- a/src/adwaita_engine.c
+++ b/src/adwaita_engine.c
@@ -429,6 +429,22 @@ adwaita_engine_render_frame (GtkThemingEngine *engine,
 	}
 	else
 	{
+		if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE) &&
+		    gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_TROUGH))
+		{
+			/* Render GtkScale trough thinner */
+			if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_VERTICAL))
+			{
+				y += height / 2 - 3;
+				height = 6;
+			}
+			else
+			{
+				x += width / 2 - 3;
+				width = 6;
+			}
+		}
+
 		GTK_THEMING_ENGINE_CLASS (adwaita_engine_parent_class)->render_frame (engine, cr, x, y,
 										      width, height);
 	}
@@ -437,6 +453,38 @@ adwaita_engine_render_frame (GtkThemingEngine *engine,
 }
 
 static void
+adwaita_engine_render_background (GtkThemingEngine *engine,
+				  cairo_t          *cr,
+				  gdouble           x,
+				  gdouble           y,
+				  gdouble           width,
+				  gdouble           height)
+{
+	const GtkWidgetPath *path;
+
+	path = gtk_theming_engine_get_path (engine);
+
+	if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE) &&
+	    gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_TROUGH))
+	{
+		/* Render GtkScale trough thinner */
+		if (!gtk_theming_engine_has_class (engine, GTK_STYLE_CLASS_VERTICAL))
+		{
+			y += height / 2 - 3;
+			height = 6;
+		}
+		else
+		{
+			x += width / 2 - 3;
+			width = 6;
+		}
+	}
+
+	GTK_THEMING_ENGINE_CLASS (adwaita_engine_parent_class)->render_background (engine, cr, x, y,
+										   width, height);
+}
+
+static void
 adwaita_engine_render_expander (GtkThemingEngine *engine,
 				cairo_t          *cr,
 				gdouble           x,
@@ -612,6 +660,7 @@ adwaita_engine_class_init (AdwaitaEngineClass *klass)
 	engine_class->render_option = adwaita_engine_render_option;
 	engine_class->render_extension = adwaita_engine_render_extension;
 	engine_class->render_frame = adwaita_engine_render_frame;
+	engine_class->render_background = adwaita_engine_render_background;
 	engine_class->render_expander = adwaita_engine_render_expander;
 	engine_class->render_activity = adwaita_engine_render_activity;
 	engine_class->render_slider = adwaita_engine_render_slider;