Implement CandidateView using HorizontalScrollView

This change re-implements CandidateView using HorizontalScrollView and
customized Button, so that the candidate strip can be flingable.

This change also introduces the following features.

- Highlighting candidate strip and space bar is configurable by
  @bool/config_candidate_highlight_enabled.
- Candidate strip can be centered with left/right padding if
  @dimen/candidate_strip_padding size is greater than 0.
- Candidate text size is configurable by @dimen/candidate_text_size.

Bug: 1575885
Bug: 3230726
Change-Id: Iedf78ff31bc9f2f6291a8e8fb7faa0e6b961dd6d
diff --git a/java/res/layout/candidates.xml b/java/res/layout/candidates.xml
index b89d442..1b8d041 100644
--- a/java/res/layout/candidates.xml
+++ b/java/res/layout/candidates.xml
@@ -1,38 +1,45 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-/* 
+/*
 **
-** Copyright 2008, The Android Open Source Project
+** Copyright 2010, The Android Open Source Project
 **
-** Licensed under the Apache License, Version 2.0 (the "License"); 
-** you may not use this file except in compliance with the License. 
-** You may obtain a copy of the License at 
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
 **
-**     http://www.apache.org/licenses/LICENSE-2.0 
+**     http://www.apache.org/licenses/LICENSE-2.0
 **
-** Unless required by applicable law or agreed to in writing, software 
-** distributed under the License is distributed on an "AS IS" BASIS, 
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
-** See the License for the specific language governing permissions and 
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
 ** limitations under the License.
 */
 -->
 
 <LinearLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        android:orientation="horizontal"
-        android:layout_width="match_parent"
-        android:layout_height="@dimen/candidate_strip_height"
-        android:background="@drawable/keyboard_suggest_strip"
-        >
-
-    <com.android.inputmethod.latin.CandidateView
-        android:id="@+id/candidates"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="@dimen/candidate_strip_height"
+    android:background="@drawable/keyboard_suggest_strip"
+    android:paddingRight="@dimen/candidate_strip_padding"
+    android:paddingLeft="@dimen/candidate_strip_padding"
+>
+    <HorizontalScrollView
+        android:id="@+id/candidates_scroll_view"
         android:layout_width="wrap_content"
         android:layout_height="@dimen/candidate_strip_height"
-        android:layout_weight="1"
         android:fadingEdge="horizontal"
         android:fadingEdgeLength="@dimen/candidate_strip_fading_edge_length"
-        />
-        
+        android:scrollbars="none"
+    >
+        <com.android.inputmethod.latin.CandidateView
+            android:id="@+id/candidates"
+            android:orientation="horizontal"
+            android:layout_width="match_parent"
+            android:layout_height="@dimen/candidate_strip_height"
+            android:background="@drawable/keyboard_suggest_strip" />
+    </HorizontalScrollView>
 </LinearLayout>