Add automatic Drawable mirroring capability when in RTL layout direction

- default value is "no mirroring"
- introduce android:autoMirrored as a new attribute for Drawable,
BitmapDrawable, LayerDrawable, StateListDrawable and NinePatchDrawable
- setting android:autoMirrored="true" means that the drawable will
be mirrored when the layout direction is RTL (right-to-left)
- also fix an issue with ImageView drawable layout direction not
updated correctly when RTL properties were changed

See bug #7034321 Need Drawable RTL support

Change-Id: If595ee5106c786f38e786d3a032e182f784a9d97

1 files changed, 44 insertions, 0 deletions

diff --git a/core/java/android/util/LayoutDirection.java b/core/java/android/util/LayoutDirection.java
new file mode 100644
index 000000000000..e37d2f22f45e
--- /dev/null
+++ b/core/java/android/util/LayoutDirection.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+package android.util;
+
+/**
+ * An interface for defining layout directions. A layout direction can be left-to-right (LTR)
+ * or right-to-left (RTL). It can also be inherited (from a parent) or deduced from the default
+ * language script of a locale.
+ */
+public interface LayoutDirection {
+    /**
+     * Horizontal layout direction is from Left to Right.
+     */
+    public static final int LTR = 0;
+
+    /**
+     * Horizontal layout direction is from Right to Left.
+     */
+    public static final int RTL = 1;
+
+    /**
+     * Horizontal layout direction is inherited.
+     */
+    public static final int INHERIT = 2;
+
+    /**
+     * Horizontal layout direction is deduced from the default language script for the locale.
+     */
+    public static final int LOCALE = 3;
+}