From d62be28515481910bbf4d2e05df89ebb33f54e0e Mon Sep 17 00:00:00 2001
From: "Tadashi G. Takaoka" <takaoka@google.com>
Date: Mon, 12 Nov 2012 19:37:24 +0900
Subject: [PATCH] Fix language switch key behavior (DO NOT MERGE)

Bug: 7075923
Change-Id: If139411db4aa65eed64337bf2a79387cfcd04496
---
 .../InputMethodManagerCompatWrapper.java      |  8 ++++
 .../android/inputmethod/latin/LatinIME.java   | 47 ++++++++++++-------
 2 files changed, 39 insertions(+), 16 deletions(-)

diff --git a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
index a01c301ee..ab7bd4914 100644
--- a/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
+++ b/java/src/com/android/inputmethod/compat/InputMethodManagerCompatWrapper.java
@@ -52,6 +52,10 @@ public final class InputMethodManagerCompatWrapper {
         sInstance.mImm = ImfUtils.getInputMethodManager(context);
     }
 
+    public InputMethodSubtype getCurrentInputMethodSubtype() {
+        return mImm.getCurrentInputMethodSubtype();
+    }
+
     public InputMethodSubtype getLastInputMethodSubtype() {
         return mImm.getLastInputMethodSubtype();
     }
@@ -65,6 +69,10 @@ public final class InputMethodManagerCompatWrapper {
                 onlyCurrentIme);
     }
 
+    public void setInputMethodAndSubtype(IBinder token, String id, InputMethodSubtype subtype) {
+        mImm.setInputMethodAndSubtype(token, id, subtype);
+    }
+
     public void showInputMethodPicker() {
         mImm.showInputMethodPicker();
     }
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index f578cc8de..70b387bec 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -141,7 +141,7 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
     private SharedPreferences mPrefs;
     /* package for tests */ final KeyboardSwitcher mKeyboardSwitcher;
     private final SubtypeSwitcher mSubtypeSwitcher;
-    private boolean mShouldSwitchToLastSubtype = true;
+    private final SubtypeState mSubtypeState = new SubtypeState();
 
     private boolean mIsMainDictionaryAvailable;
     private UserBinaryDictionary mUserDictionary;
@@ -365,6 +365,34 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
         }
     }
 
+    static final class SubtypeState {
+        private InputMethodSubtype mLastActiveSubtype;
+        private boolean mCurrentSubtypeUsed;
+
+        public void currentSubtypeUsed() {
+            mCurrentSubtypeUsed = true;
+        }
+
+        public void switchSubtype(final IBinder token, final InputMethodManagerCompatWrapper imm,
+                final Context context) {
+            final InputMethodSubtype currentSubtype = imm.getCurrentInputMethodSubtype();
+            final InputMethodSubtype lastActiveSubtype = mLastActiveSubtype;
+            final boolean currentSubtypeUsed = mCurrentSubtypeUsed;
+            if (currentSubtypeUsed) {
+                mLastActiveSubtype = currentSubtype;
+                mCurrentSubtypeUsed = false;
+            }
+            if (currentSubtypeUsed
+                    && ImfUtils.checkIfSubtypeBelongsToThisImeAndEnabled(context, lastActiveSubtype)
+                    && !currentSubtype.equals(lastActiveSubtype)) {
+                final String id = ImfUtils.getInputMethodIdOfThisIme(context);
+                imm.setInputMethodAndSubtype(token, id, lastActiveSubtype);
+                return;
+            }
+            imm.switchToNextInputMethod(token, true /* onlyCurrentIme */);
+        }
+    }
+
     public LatinIME() {
         super();
         mSubtypeSwitcher = SubtypeSwitcher.getInstance();
@@ -887,6 +915,7 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
         // Make a note of the cursor position
         mLastSelectionStart = newSelStart;
         mLastSelectionEnd = newSelEnd;
+        mSubtypeState.currentSubtypeUsed();
     }
 
     /**
@@ -1235,19 +1264,7 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
             mImm.switchToNextInputMethod(token, false /* onlyCurrentIme */);
             return;
         }
-        if (mShouldSwitchToLastSubtype) {
-            final InputMethodSubtype lastSubtype = mImm.getLastInputMethodSubtype();
-            final boolean lastSubtypeBelongsToThisIme =
-                    ImfUtils.checkIfSubtypeBelongsToThisImeAndEnabled(this, lastSubtype);
-            if (lastSubtypeBelongsToThisIme && mImm.switchToLastInputMethod(token)) {
-                mShouldSwitchToLastSubtype = false;
-            } else {
-                mImm.switchToNextInputMethod(token, true /* onlyCurrentIme */);
-                mShouldSwitchToLastSubtype = true;
-            }
-        } else {
-            mImm.switchToNextInputMethod(token, true /* onlyCurrentIme */);
-        }
+        mSubtypeState.switchSubtype(token, mImm, this);
     }
 
     private void sendDownUpKeyEventForBackwardCompatibility(final int code) {
@@ -1316,7 +1333,6 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
             handleBackspace(spaceState);
             mDeleteCount++;
             mExpectingUpdateSelection = true;
-            mShouldSwitchToLastSubtype = true;
             LatinImeLogger.logOnDelete(x, y);
             break;
         case Keyboard.CODE_SHIFT:
@@ -1372,7 +1388,6 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
                 handleCharacter(primaryCode, keyX, keyY, spaceState);
             }
             mExpectingUpdateSelection = true;
-            mShouldSwitchToLastSubtype = true;
             break;
         }
         switcher.onCodeInput(primaryCode);