Fast key preview

Previously the key preview was implemented by PopupWindow.  The key
preview popup window would be dismissed and shown each time the key
was released and pressed.  It turned out that it was taking several
milliseconds.

This change implements the key preview by a simple TextView which will
be layout-ed at absolute coordinates within the screen FrameLayout.
And dismissing and showing the key preview is implemented by the
TextView's visibility.

This implementation needs careful coordination of candidates.xml
layout and LatinIME.onComputeInsets to control suggestion strip
visibility.

Bug: 4179964
Change-Id: Id6347cb35b91eb14ab20dd2f312e58b54b6625a7

4 files changed, 2 insertions, 60 deletions

diff --git a/java/res/anim/key_preview_fadein.xml b/java/res/anim/key_preview_fadein.xml
deleted file mode 100644
index 9fad7b9a7..000000000
--- a/java/res/anim/key_preview_fadein.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** 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
-**
-**     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
-** limitations under the License.
-*/
--->
-
-<set
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:interpolator="@android:anim/decelerate_interpolator"
->
-    <alpha
-        android:fromAlpha="0.5"
-        android:toAlpha="1.0"
-        android:duration="@integer/config_preview_fadein_anim_time" />
-</set>
diff --git a/java/res/anim/key_preview_fadeout.xml b/java/res/anim/key_preview_fadeout.xml
deleted file mode 100644
index 7de5123cd..000000000
--- a/java/res/anim/key_preview_fadeout.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** 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
-**
-**     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
-** limitations under the License.
-*/
--->
-
-<set
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:interpolator="@android:anim/accelerate_interpolator"
->
-    <alpha
-        android:fromAlpha="1.0"
-        android:toAlpha="0.0"
-        android:duration="@integer/config_preview_fadeout_anim_time" />
-</set>
diff --git a/java/res/anim/mini_keyboard_fadein.xml b/java/res/anim/mini_keyboard_fadein.xml
index 9fad7b9a7..f80e8b8de 100644
--- a/java/res/anim/mini_keyboard_fadein.xml
+++ b/java/res/anim/mini_keyboard_fadein.xml
@@ -25,5 +25,5 @@
     <alpha
         android:fromAlpha="0.5"
         android:toAlpha="1.0"
-        android:duration="@integer/config_preview_fadein_anim_time" />
+        android:duration="@integer/config_mini_keyboard_fadein_anim_time" />
 </set>
diff --git a/java/res/anim/mini_keyboard_fadeout.xml b/java/res/anim/mini_keyboard_fadeout.xml
index 7de5123cd..535b100ae 100644
--- a/java/res/anim/mini_keyboard_fadeout.xml
+++ b/java/res/anim/mini_keyboard_fadeout.xml
@@ -25,5 +25,5 @@
     <alpha
         android:fromAlpha="1.0"
         android:toAlpha="0.0"
-        android:duration="@integer/config_preview_fadeout_anim_time" />
+        android:duration="@integer/config_mini_keyboard_fadeout_anim_time" />
 </set>