[nautilus] Draw background of inactive panes in INSENSITIVE color.

[Alexander Larsson <alexl src gnome org>]

commit 2f843f0ed243a1c1f184c69e166c9da710fe1618
Author: Holger Berndt <berndth gmx de>
Date:   Sat Jun 13 15:01:34 2009 +0200

    Draw background of inactive panes in INSENSITIVE color.
    
    In order to make it easier to visually distinguish active and inactive
    panes, the background of inactive panes is drawn in the theme's
    INSENSITIVE color. Like the inactive location bar widgets, this is
    only a visual marker, and does not mean that that pane is
    insensitive. It's still clickable, and in fact a click makes the
    corresponding pane active.

 eel/eel-background.c       |   66 ++++++++++++++++++++++++++++++++++++++-----
 eel/eel-background.h       |    4 ++
 src/nautilus-window-pane.c |    3 ++
 src/nautilus-window-slot.c |   18 ++++++++++++
 src/nautilus-window-slot.h |    2 +
 5 files changed, 85 insertions(+), 8 deletions(-)
---
diff --git a/eel/eel-background.c b/eel/eel-background.c
index 371ae78..19269bb 100644
--- a/eel/eel-background.c
+++ b/eel/eel-background.c
@@ -98,6 +98,9 @@ struct EelBackgroundDetails {
 	/* Can we use common pixmap for root window and desktop window */
 	gboolean use_common_pixmap;
 	guint change_idle_id;
+
+	/* activity status */
+	gboolean is_active;
 };
 
 static void
@@ -171,6 +174,7 @@ eel_background_init (gpointer object, gpointer klass)
 	background->details->default_color.green = 0xffff;
 	background->details->default_color.blue = 0xffff;
 	background->details->bg = gnome_bg_new ();
+	background->details->is_active = TRUE;
 
 	g_signal_connect (background->details->bg, "changed",
 			  G_CALLBACK (on_bg_changed), background);
@@ -397,6 +401,38 @@ eel_background_ensure_realized (EelBackground *background, GdkWindow *window)
 	return changed;
 }
 
+#define CLAMP_COLOR(v) (t = (v), CLAMP (t, 0, G_MAXUSHORT))
+#define SATURATE(v) ((1.0 - saturation) * intensity + saturation * (v))
+
+static void
+make_color_inactive (EelBackground *background, GdkColor *color)
+{
+	double intensity, saturation;
+	gushort t;
+
+	if (!background->details->is_active) {
+		saturation = 0.7;
+		intensity = color->red * 0.30 + color->green * 0.59 + color->blue * 0.11;
+		color->red = SATURATE (color->red);
+		color->green = SATURATE (color->green);
+		color->blue = SATURATE (color->blue);
+
+		if (intensity > G_MAXUSHORT / 2) {
+			color->red *= 0.9;
+			color->green *= 0.9;
+			color->blue *= 0.9;
+		} else {
+			color->red *= 1.25;
+			color->green *= 1.25;
+			color->blue *= 1.25;
+		}
+
+		color->red = CLAMP_COLOR (color->red);
+		color->green = CLAMP_COLOR (color->green);
+		color->blue = CLAMP_COLOR (color->blue);
+	}
+}
+
 static GdkPixmap *
 eel_background_get_pixmap_and_color (EelBackground *background,
 				     GdkWindow     *window,
@@ -408,9 +444,10 @@ eel_background_get_pixmap_and_color (EelBackground *background,
 	drawable_get_adjusted_size (background, window, &entire_width, &entire_height);
 
 	eel_background_ensure_realized (background, window);
-	
+
 	*color = background->details->default_color;
-	
+	make_color_inactive (background, color);
+
 	if (background->details->background_pixmap != NULL) {
 		return g_object_ref (background->details->background_pixmap);
 	} 
@@ -472,14 +509,15 @@ eel_background_expose (GtkWidget                   *widget,
 static void
 set_image_properties (EelBackground *background)
 {
+	GdkColor c;
 	if (!background->details->color) {
+		c = background->details->default_color;
+		make_color_inactive (background, &c);
 		gnome_bg_set_color (background->details->bg, GNOME_BG_COLOR_SOLID,
-				 &background->details->default_color, NULL);
+				    &c, NULL);
 	} else if (!eel_gradient_is_gradient (background->details->color)) {
-		GdkColor c;
-
 		eel_gdk_color_parse_with_white_default (background->details->color, &c);
-	
+		make_color_inactive (background, &c);
 		gnome_bg_set_color (background->details->bg, GNOME_BG_COLOR_SOLID, &c, NULL);
 	} else {
 		GdkColor c1;
@@ -488,10 +526,12 @@ set_image_properties (EelBackground *background)
 
 		spec = eel_gradient_get_start_color_spec (background->details->color);
 		eel_gdk_color_parse_with_white_default (spec, &c1);
+		make_color_inactive (background, &c1);
 		g_free (spec);
 
 		spec = eel_gradient_get_end_color_spec (background->details->color);
 		eel_gdk_color_parse_with_white_default (spec, &c2);
+		make_color_inactive (background, &c2);
 		g_free (spec);
 
 		if (eel_gradient_is_horizontal (background->details->color))
@@ -739,8 +779,8 @@ eel_background_set_up_widget (EelBackground *background, GtkWidget *widget)
 			gdk_window_set_back_pixmap (window, NULL, FALSE);
 			gdk_window_set_background (window, &color);
 		}
-        }
-	
+	}
+
 	if (background->details->is_desktop && !in_fade) {
 		set_root_pixmap (background, window);
 	}
@@ -1079,6 +1119,16 @@ eel_background_save_to_gconf (EelBackground *background)
 		gnome_bg_save_to_preferences (background->details->bg, client);
 }
 
+void
+eel_background_set_active (EelBackground *background,
+			   gboolean is_active)
+{
+	if (background->details->is_active != is_active) {
+		background->details->is_active = is_active;
+		set_image_properties (background);
+	}
+}
+
 /* self check code */
 
 #if !defined (EEL_OMIT_SELF_CHECK)
diff --git a/eel/eel-background.h b/eel/eel-background.h
index a2a6404..147cc5d 100644
--- a/eel/eel-background.h
+++ b/eel/eel-background.h
@@ -118,6 +118,10 @@ void                        eel_background_receive_dropped_background_image (Eel
 EelBackground *             eel_get_widget_background                       (GtkWidget                   *widget);
 void			    eel_background_save_to_gconf                    (EelBackground               *background);
 
+/* Set activity status of background. Inactive backgrounds are drawn in the theme's INSENSITIVE color. */
+void                        eel_background_set_active                       (EelBackground               *background,
+									     gboolean                     is_active);
+
 typedef struct EelBackgroundDetails EelBackgroundDetails;
 
 struct EelBackground
diff --git a/src/nautilus-window-pane.c b/src/nautilus-window-pane.c
index 371fede..1bdeb5c 100644
--- a/src/nautilus-window-pane.c
+++ b/src/nautilus-window-pane.c
@@ -188,6 +188,9 @@ nautilus_window_pane_set_active (NautilusWindowPane *pane, gboolean is_active)
 	}
 
 	pane->is_active = is_active;
+
+	/* notify the current slot about its activity state (so that it can e.g. modify the bg color) */
+	nautilus_window_slot_is_in_active_pane (pane->active_slot, is_active);
 }
 
 static void
diff --git a/src/nautilus-window-slot.c b/src/nautilus-window-slot.c
index 83cbb55..dc3544d 100644
--- a/src/nautilus-window-slot.c
+++ b/src/nautilus-window-slot.c
@@ -27,11 +27,13 @@
 #include "nautilus-desktop-window.h"
 #include "nautilus-window-private.h"
 #include "nautilus-window-manage-views.h"
+#include "file-manager/fm-directory-view.h"
 #include <libnautilus-private/nautilus-file.h>
 #include <libnautilus-private/nautilus-file-utilities.h>
 #include <libnautilus-private/nautilus-window-slot-info.h>
 #include <eel/eel-gtk-macros.h>
 #include <eel/eel-string.h>
+#include <eel/eel-background.h>
 
 static void nautilus_window_slot_init       (NautilusWindowSlot *slot);
 static void nautilus_window_slot_class_init (NautilusWindowSlotClass *class);
@@ -390,6 +392,22 @@ title_changed_callback (NautilusView *view,
 	nautilus_window_slot_update_icon (slot);
 }
 
+void
+nautilus_window_slot_is_in_active_pane (NautilusWindowSlot *slot,
+					gboolean is_active)
+{
+	EelBackground *bg;
+
+	/* NULL is valid, and happens during init */
+	if (!slot) {
+		return;
+	}
+
+	bg = EEL_BACKGROUND (fm_directory_view_get_background (FM_DIRECTORY_VIEW (slot->content_view)));
+	g_return_if_fail (EEL_IS_BACKGROUND (bg));
+
+	eel_background_set_active (bg, is_active);
+}
 
 void
 nautilus_window_slot_connect_content_view (NautilusWindowSlot *slot,
diff --git a/src/nautilus-window-slot.h b/src/nautilus-window-slot.h
index ba04dce..3b06f7b 100644
--- a/src/nautilus-window-slot.h
+++ b/src/nautilus-window-slot.h
@@ -176,4 +176,6 @@ void    nautilus_window_slot_remove_extra_location_widgets (NautilusWindowSlot *
 
 void    nautilus_window_slot_add_current_location_to_history_list (NautilusWindowSlot *slot);
 
+void    nautilus_window_slot_is_in_active_pane (NautilusWindowSlot *slot, gboolean is_active);
+
 #endif /* NAUTILUS_WINDOW_SLOT_H */