Rub some butter on dictionary list scrolling.

The default implementation for preferences refuses to
cache the views for custom preferences at all. We can
do it, but the system won't do it for us, so this does it.
This makes the screen scrolling smooth again.

Incidentally it also fixes the bug where the button may
not animate on the first element.

Bug: 8882722
Bug: 8883108
Change-Id: I9b2306ac4bf93761a808ebfee3477a65f017cddf

1 files changed, 16 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/dictionarypack/DictionaryListInterfaceState.java b/java/src/com/android/inputmethod/dictionarypack/DictionaryListInterfaceState.java
index de3711c27..5ad5900d4 100644
--- a/java/src/com/android/inputmethod/dictionarypack/DictionaryListInterfaceState.java
+++ b/java/src/com/android/inputmethod/dictionarypack/DictionaryListInterfaceState.java
@@ -16,8 +16,11 @@
 
 package com.android.inputmethod.dictionarypack;
 
+import android.view.View;
+
 import com.android.inputmethod.latin.CollectionUtils;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 
 /**
@@ -37,6 +40,7 @@ public class DictionaryListInterfaceState {
     }
 
     private HashMap<String, State> mWordlistToState = CollectionUtils.newHashMap();
+    private ArrayList<View> mViewCache = CollectionUtils.newArrayList();
 
     public boolean isOpen(final String wordlistId) {
         final State state = mWordlistToState.get(wordlistId);
@@ -64,4 +68,16 @@ public class DictionaryListInterfaceState {
             state.mOpen = false;
         }
     }
+
+    public View findFirstOrphanedView() {
+        for (final View v : mViewCache) {
+            if (null == v.getParent()) return v;
+        }
+        return null;
+    }
+
+    public View addToCacheAndReturnView(final View view) {
+        mViewCache.add(view);
+        return view;
+    }
 }