Dynamically colored alert widget. (#2717)

blue background on update

old-commit-hash: bffdfd5303

selfdrive/ui/qt/home.cc

@@ -99,7 +99,9 @@ void OffroadHome::refresh() {
   }
 
   alert_notification->setVisible(true);
-  alert_notification->setStyleSheet(QString(R"(
+
+  // Red background for alerts, blue for update available
+  QString style = QString(R"(
     padding: 15px;
     padding-left: 30px;
     padding-right: 30px;
@@ -108,7 +110,11 @@ void OffroadHome::refresh() {
     font-size: 40px;
     font-weight: bold;
     background-color: red;
-  )"));
+  )");
+  if (alerts_widget->updateAvailable){
+    style.replace("red", "blue");
+  }
+  alert_notification->setStyleSheet(style);
 }