am ec9670ac: Merge "Rub some butter on dictionary list scrolling."

* commit 'ec9670ac3dfa74b81eff409fefa7460ce5175c4a':
  Rub some butter on dictionary list scrolling.

java/src/com/android/inputmethod/dictionarypack/ButtonSwitcher.java

@@ -57,6 +57,11 @@ public class ButtonSwitcher extends FrameLayout {
         super(context, attrs, defStyle);
     }
 
+    public void reset() {
+        mStatus = NOT_INITIALIZED;
+        mAnimateToStatus = NOT_INITIALIZED;
+    }
+
     @Override
     protected void onLayout(final boolean changed, final int left, final int top, final int right,
             final int bottom) {
@@ -64,9 +69,7 @@ public class ButtonSwitcher extends FrameLayout {
         mInstallButton = (Button)findViewById(R.id.dict_install_button);
         mCancelButton = (Button)findViewById(R.id.dict_cancel_button);
         mDeleteButton = (Button)findViewById(R.id.dict_delete_button);
-        mInstallButton.setOnClickListener(mOnClickListener);
-        mCancelButton.setOnClickListener(mOnClickListener);
-        mDeleteButton.setOnClickListener(mOnClickListener);
+        setInternalOnClickListener(mOnClickListener);
         setButtonPositionWithoutAnimation(mStatus);
         if (mAnimateToStatus != NOT_INITIALIZED) {
             // We have been asked to animate before we were ready, so we took a note of it.
@@ -139,6 +142,12 @@ public class ButtonSwitcher extends FrameLayout {
 
     public void setInternalOnClickListener(final OnClickListener listener) {
         mOnClickListener = listener;
+        if (null != mInstallButton) {
+            // Already laid out : do it now
+            mInstallButton.setOnClickListener(mOnClickListener);
+            mCancelButton.setOnClickListener(mOnClickListener);
+            mDeleteButton.setOnClickListener(mOnClickListener);
+        }
     }
 
     private ViewPropertyAnimator animateButton(final View button, final int direction) {

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;
+    }
 }

java/src/com/android/inputmethod/dictionarypack/WordListPreference.java

@@ -98,6 +98,14 @@ public final class WordListPreference extends Preference {
         setSummary(getSummary(status));
     }
 
+    @Override
+    public View onCreateView(final ViewGroup parent) {
+        final View orphanedView = mInterfaceState.findFirstOrphanedView();
+        if (null != orphanedView) return orphanedView; // Will be sent to onBindView
+        final View newView = super.onCreateView(parent);
+        return mInterfaceState.addToCacheAndReturnView(newView);
+    }
+
     private String getSummary(final int status) {
         switch (status) {
             // If we are deleting the word list, for the user it's like it's already deleted.
@@ -209,6 +217,9 @@ public final class WordListPreference extends Preference {
 
         final ButtonSwitcher buttonSwitcher =
                 (ButtonSwitcher)view.findViewById(R.id.wordlist_button_switcher);
+        // We need to clear the state of the button switcher, because we reuse views; if we didn't
+        // reset it would animate from whatever its old state was.
+        buttonSwitcher.reset();
         if (mInterfaceState.isOpen(mWordlistId)) {
             // The button is open.
             final int previousStatus = mInterfaceState.getStatus(mWordlistId);