[gnome-control-center] wacom: Make "Calibrate" button insensitive if there is no screen match

[Bastien Nocera <hadess src gnome org>]

commit 17c2e2c2576cc7fd116c930210a1baeb539df1b6
Author: Peter Hutterer <peter hutterer who-t net>
Date:   Thu Apr 12 15:36:08 2012 +0200

    wacom: Make "Calibrate" button insensitive if there is no screen match
    
    If no match is found for the screen tablet, calibration will fail anyway.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=673892

 panels/wacom/cc-wacom-page.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/panels/wacom/cc-wacom-page.c b/panels/wacom/cc-wacom-page.c
index 3a3128a..40ac167 100644
--- a/panels/wacom/cc-wacom-page.c
+++ b/panels/wacom/cc-wacom-page.c
@@ -1032,6 +1032,7 @@ update_tablet_ui (CcWacomPage *page,
 		  int          layout)
 {
 	CcWacomPagePrivate *priv;
+	gboolean has_monitor = FALSE;
 
 	priv = page->priv;
 
@@ -1054,6 +1055,9 @@ update_tablet_ui (CcWacomPage *page,
 		gtk_widget_destroy (WID ("display-mapping-button"));
 
 		gtk_widget_show (WID ("button-calibrate"));
+		if (gsd_wacom_device_get_display_monitor (page->priv->stylus) >= 0)
+			has_monitor = TRUE;
+		gtk_widget_set_sensitive (WID ("button-calibrate"), has_monitor);
 		gtk_widget_show (WID ("display-link"));
 
 		gtk_container_child_set (CWID ("main-grid"),