Hide voice mail icon on "1" button if it is not configured yet

Classes/LinphoneUI/UIDigitButtonLongVoiceMail.h

@@ -26,4 +26,10 @@
 @interface UIDigitButtonLongVoiceMail : UIDigitButton {
 }
 
+/* Returns TRUE if voice mail is configured in LinphoneCore */
+- (BOOL) voiceMailEnabled;
+
+/*! Automatically chooses the right icon depending on voice mail configured or not */
+- (void) refreshUI;
+
 @end

Classes/LinphoneUI/UIDigitButtonLongVoiceMail.m

@@ -29,17 +29,32 @@
 }
 
 - (void)onLongTouch {
-	if(![LinphoneManager isLcReady]) {
-		[LinphoneLogger log:LinphoneLoggerWarning format:@"Cannot call voice mail: Linphone core not ready"];
-		return;
-	}
-	LinphoneManager* lm = [LinphoneManager instance];
-
-	NSString * voiceMailUri = [lm lpConfigStringForKey:@"voice_mail_uri" withDefault:NULL];
-	
-	if (voiceMailUri != NULL) {
-		[lm call:voiceMailUri displayName:NSLocalizedString(@"Voice mail",nil) transfer:FALSE];
+	if ([self voiceMailEnabled]) {
+		LinphoneManager *lm = [LinphoneManager instance];
+		[lm call:[lm lpConfigStringForKey:@"voice_mail_uri"] displayName:NSLocalizedString(@"Voice mail",nil) transfer:FALSE];
 	}
 }
 
+- (BOOL) voiceMailEnabled {
+	if(![LinphoneManager isLcReady]) {
+		[LinphoneLogger log:LinphoneLoggerWarning format:@"Cannot call voice mail: Linphone core not ready"];
+		return FALSE;
+	}
+
+	NSString * voiceMailUri = [[LinphoneManager instance] lpConfigStringForKey:@"voice_mail_uri" withDefault:NULL];
+
+	return (voiceMailUri != NULL);
+}
+
+- (void)refreshUI {
+	NSMutableString *name = [[NSMutableString alloc] initWithString:@"numpad_one_"];
+
+	if ([self voiceMailEnabled]) {
+		[name appendString:@"voicemail_"];
+	}
+
+	[self setImage:[UIImage imageNamed:[name stringByAppendingString:@"default.png"]] forState: UIControlStateNormal];
+	[self setImage:[UIImage imageNamed:[name stringByAppendingString:@"over.png"]] forState: UIControlStateHighlighted];
+}
+
 @end