adjusted item_selection and created a module 'beatplayer'

beatplayer.py

@@ -0,0 +1,25 @@
+from .item_selection import ItemSelection
+
+class BeatPlayer:
+
+    def __init__(self, screen):
+        self.screen = screen
+        self.max_name_width = 200
+        self.clip_selection = ItemSelection(self.max_name_width)
+        self.track_selection = ItemSelection(self.max_name_width)
+        self.show_selection = False
+        
+    def set_clip_names(self, clips):
+        self.clip_selection.set_items(clips)
+
+    def set_track_names(self, tracks):
+        self.track_selection.set_items(tracks)
+
+    def update(self):
+        if self.show_selection:
+            self.track_selection.update()
+            self.clip_selection.update()
+            self.screen.blit(self.track_selection.surface, ((self.screen.get_width()/4),
+                            (self.screen.get_height() - self.track_selection.surface.get_height())/2))
+            self.screen.blit(self.clip_selection.surface, ((self.screen.get_width()/4 + self.max_name_width) + 100,
+                            (self.screen.get_height() - self.clip_selection.surface.get_height())/2))