From: Hugo Villeneuve <hugo@hugovil.com>
Date: Sun, 21 Dec 2014 21:41:19 +0000 (-0500)
Subject: Update clock only when time changes
X-Git-Url: http://gitweb.hugovil.com/?a=commitdiff_plain;h=9083fb852f001b2e2210dbe92c688bc3d34f8da6;p=dockapps%2Fhvclock.git

Update clock only when time changes
---

diff --git a/src/clock.c b/src/clock.c
index b26d125..05964b5 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -447,8 +447,29 @@ static gboolean
 hvclock_update(gpointer data)
 {
 	GtkWidget *clock = GTK_WIDGET(data);
+	static struct tm previous;
+	struct tm *now;
+	int update = false;
 
-	hvclock_redraw_canvas(clock);
+	now = clock_get_time();
+
+	/* Update only if time has changed. If the hours or minutes have
+	 * changed, force update. */
+	if ((now->tm_hour != previous.tm_hour) ||
+	    (now->tm_min != previous.tm_min)) {
+		update = true;
+	}
+
+	/* If the seconds have changed, force update only if displaying of
+	 * the seconds hand is requested. */
+	if (hvclock_infos.show_seconds && (now->tm_sec != previous.tm_sec)) {
+		update = true;
+	}
+
+	if (update) {
+		hvclock_redraw_canvas(clock);
+		previous = *now;
+	}
 
 	return TRUE; /* keep running this event */
 }