Added 'attention' method to MFDs for drawing the users attention to t…

…he device.

Because who doesn't want their X52 to flash at them?

trade.py

@@ -16,6 +16,7 @@
 
 import argparse             # For parsing command line args.
 import sys                  # Inevitably.
+import time
 
 ######################################################################
 # The thing I hate most about Python is the global lock. What kind
@@ -66,6 +67,12 @@ def display(self, line1, line2="", line3="", delay=None):
         """
         pass
 
+    def attention(self, duration):
+        """
+            Draw the user's attention.
+        """
+        print("\a")
+
 
 class X52ProMFD(DummyMFD):
     """
@@ -86,7 +93,17 @@ def finish(self):
 
     def display(self, line1, line2="", line3="", delay=None):
         self.page[0], self.page[1], self.page[2] = line1, line2, line3
-        if delay: import time; time.sleep(delay)
+        if delay: time.sleep(delay)
+
+    def attention(self, duration):
+        page = self.page
+        iterNo = 0
+        cutoff = time.time() + duration
+        while time.time() <= cutoff:
+            for ledNo in range(0, 20):
+                page.set_led(ledNo, (iterNo + ledNo) % 4)
+            iterNo += 1
+            time.sleep(0.02)
 
 ######################################################################
 # Functions