[gthumb] histogram view: set insensitive when there is no histogram to view

[Paolo Bacchilega <paobac src gnome org>]

commit 82ce7463c6cd5474727a2ce8519c4a94e115dc89
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Mar 2 15:09:13 2011 +0100

    histogram view: set insensitive when there is no histogram to view

 gthumb/gth-histogram-view.c |   27 ++++++++++++++++++---------
 1 files changed, 18 insertions(+), 9 deletions(-)
---
diff --git a/gthumb/gth-histogram-view.c b/gthumb/gth-histogram-view.c
index de84f9d..1fa1768 100644
--- a/gthumb/gth-histogram-view.c
+++ b/gthumb/gth-histogram-view.c
@@ -445,17 +445,11 @@ histogram_view_expose_event_cb (GtkWidget      *widget,
 	if ((self->priv->histogram == NULL)
 	    || ((int) self->priv->current_channel > gth_histogram_get_nchannels (self->priv->histogram)))
 	{
-		/* draw an x if the current channel is not available */
-
-		gdk_cairo_set_source_color (cr, &style->text[gtk_widget_get_state (widget)]);
-		cairo_set_line_width (cr, 1.0);
-		cairo_move_to (cr, 0, 0);
-		cairo_line_to (cr, allocation.width + 1, allocation.height + 1);
-		cairo_move_to (cr, allocation.width + 1, 0);
-		cairo_line_to (cr, 0, allocation.height + 1);
-		cairo_stroke (cr);
+		gtk_widget_set_sensitive (self->priv->histogram_view, FALSE);
 	}
 	else {
+		gtk_widget_set_sensitive (self->priv->histogram_view, TRUE);
+
 		if ((self->priv->selection_start > 0) || (self->priv->selection_end < 255))
 			gth_histogram_paint_selection (self, cr, &allocation);
 
@@ -847,6 +841,21 @@ _gth_histogram_view_update_info (GthHistogramView *self)
 	int                  i;
 	char                *s;
 
+	if ((self->priv->histogram == NULL)
+	    || ((int) self->priv->current_channel > gth_histogram_get_nchannels (self->priv->histogram)))
+	{
+		gtk_widget_set_sensitive (GET_WIDGET ("histogram_info"), FALSE);
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("mean_label")), "");
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("std_dev_label")), "");
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("median_label")), "");
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("total_label")), "");
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("selected_label")), "");
+		gtk_label_set_text (GTK_LABEL (GET_WIDGET ("percentile_label")), "");
+		return;
+	}
+
+	gtk_widget_set_sensitive (GET_WIDGET ("histogram_info"), TRUE);
+
 	if (gth_histogram_view_get_display_mode (self) == GTH_HISTOGRAM_MODE_ALL_CHANNELS) {
 		first_channel = GTH_HISTOGRAM_CHANNEL_RED;
 		last_channel = GTH_HISTOGRAM_CHANNEL_BLUE;