1 files changed, 22 insertions, 3 deletions
diff --git a/java/src/com/android/inputmethod/event/Combiner.java b/java/src/com/android/inputmethod/event/Combiner.java
index ab6b70c04..8b808c6b3 100644
--- a/java/src/com/android/inputmethod/event/Combiner.java
+++ b/java/src/com/android/inputmethod/event/Combiner.java
@@ -16,14 +16,33 @@
 
 package com.android.inputmethod.event;
 
+import java.util.ArrayList;
+
 /**
- * A generic interface for combiners.
+ * A generic interface for combiners. Combiners are objects that transform chains of input events
+ * into committable strings and manage feedback to show to the user on the combining state.
  */
 public interface Combiner {
     /**
-     * Combine an event with the existing state and return the new event.
+     * Process an event, possibly combining it with the existing state and return the new event.
+     *
+     * If this event does not result in any new event getting passed down the chain, this method
+     * returns null. It may also modify the previous event list if appropriate.
+     *
+     * @param previousEvents the previous events in this composition.
      * @param event the event to combine with the existing state.
      * @return the resulting event.
      */
-    Event combine(Event event);
+    Event processEvent(ArrayList<Event> previousEvents, Event event);
+
+    /**
+     * Get the feedback that should be shown to the user for the current state of this combiner.
+     * @return A CharSequence representing the feedback to show users. It may include styles.
+     */
+    CharSequence getCombiningStateFeedback();
+
+    /**
+     * Reset the state of this combiner, for example when the cursor was moved.
+     */
+    void reset();
 }