1 files changed, 28 insertions, 0 deletions
diff --git a/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Instrument.scala b/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Instrument.scala
new file mode 100644
index 0000000..5b0a13d
--- /dev/null
+++ b/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Instrument.scala
@@ -0,0 +1,28 @@
+package vfd.dashboard.ui.instruments
+
+import rx._
+import org.scalajs.dom.html
+
+/** Common trait to all flight instruments. */
+trait Instrument[A] {
+
+  /** Initial value. */
+  val initial: A
+
+  /** Current value that is displayed in the instrument. */
+  val value: Var[A] = Var(initial)
+
+  /** HTML element that contains the rendered instrument */
+  val element: html.Element
+
+  /** Performs the actual UI update of this instrument. */
+  protected def update(newValue: A): Unit
+
+  /** Call when instrument has finished setting up its UI. */
+  protected def ready() = {
+    Obs(value, skipInitial = true) {
+      update(value())
+    }
+  }
+
+}
+\ No newline at end of file