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/*
* 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 com.android.inputmethod.latin.inputlogic;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import com.android.inputmethod.latin.InputPointers;
import com.android.inputmethod.latin.LatinIME;
import com.android.inputmethod.latin.Suggest;
import com.android.inputmethod.latin.SuggestedWords;
import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback;
/**
* A helper to manage deferred tasks for the input logic.
*/
// TODO: Make this package private
public class InputLogicHandler implements Handler.Callback {
final Handler mNonUIThreadHandler;
// TODO: remove this reference.
final LatinIME mLatinIME;
final InputLogic mInputLogic;
private final Object mLock = new Object();
private boolean mInBatchInput; // synchronized using {@link #mLock}.
private static final int MSG_GET_SUGGESTED_WORDS = 1;
public InputLogicHandler(final LatinIME latinIME, final InputLogic inputLogic) {
final HandlerThread handlerThread = new HandlerThread(
InputLogicHandler.class.getSimpleName());
handlerThread.start();
mNonUIThreadHandler = new Handler(handlerThread.getLooper(), this);
mLatinIME = latinIME;
mInputLogic = inputLogic;
}
public void destroy() {
mNonUIThreadHandler.getLooper().quit();
}
/**
* Handle a message.
* @see android.os.Handler.Callback#handleMessage(android.os.Message)
*/
// Called on the Non-UI handler thread by the Handler code.
@Override
public boolean handleMessage(final Message msg) {
switch (msg.what) {
case MSG_GET_SUGGESTED_WORDS:
mLatinIME.getSuggestedWords(msg.arg1 /* sessionId */,
msg.arg2 /* sequenceNumber */, (OnGetSuggestedWordsCallback) msg.obj);
break;
}
return true;
}
// Called on the UI thread by InputLogic.
public void onStartBatchInput() {
synchronized (mLock) {
mInBatchInput = true;
}
}
/**
* Fetch suggestions corresponding to an update of a batch input.
* @param batchPointers the updated pointers, including the part that was passed last time.
* @param sequenceNumber the sequence number associated with this batch input.
* @param forEnd true if this is the end of a batch input, false if it's an update.
*/
// This method can be called from any thread and will see to it that the correct threads
// are used for parts that require it. This method will send a message to the Non-UI handler
// thread to pull suggestions, and get the inlined callback to get called on the Non-UI
// handler thread. If this is the end of a batch input, the callback will then proceed to
// send a message to the UI handler in LatinIME so that showing suggestions can be done on
// the UI thread.
private void updateBatchInput(final InputPointers batchPointers,
final int sequenceNumber, final boolean forEnd) {
synchronized (mLock) {
if (!mInBatchInput) {
// Batch input has ended or canceled while the message was being delivered.
return;
}
mInputLogic.mWordComposer.setBatchInputPointers(batchPointers);
getSuggestedWords(Suggest.SESSION_GESTURE, sequenceNumber,
new OnGetSuggestedWordsCallback() {
@Override
public void onGetSuggestedWords(SuggestedWords suggestedWords) {
// We're now inside the callback. This always runs on the Non-UI thread,
// no matter what thread updateBatchInput was originally called on.
if (suggestedWords.isEmpty()) {
// Use old suggestions if we don't have any new ones.
// Previous suggestions are found in InputLogic#mSuggestedWords.
// Since these are the most recent ones and we just recomputed
// new ones to update them, then the previous ones are there.
suggestedWords = mInputLogic.mSuggestedWords;
}
mLatinIME.mHandler.showGesturePreviewAndSuggestionStrip(suggestedWords,
forEnd /* dismissGestureFloatingPreviewText */);
if (forEnd) {
mInBatchInput = false;
// The following call schedules onEndBatchInputAsyncInternal
// to be called on the UI thread.
mLatinIME.mHandler.onEndBatchInput(suggestedWords);
}
}
});
}
}
/**
* Update a batch input.
*
* This fetches suggestions and updates the suggestion strip and the floating text preview.
*
* @param batchPointers the updated batch pointers.
* @param sequenceNumber the sequence number associated with this batch input.
*/
// Called on the UI thread by InputLogic.
public void onUpdateBatchInput(final InputPointers batchPointers,
final int sequenceNumber) {
updateBatchInput(batchPointers, sequenceNumber, false /* forEnd */);
}
/**
* Cancel a batch input.
*
* Note that as opposed to onEndBatchInput, we do the UI side of this immediately on the
* same thread, rather than get this to call a method in LatinIME. This is because
* canceling a batch input does not necessitate the long operation of pulling suggestions.
*/
// Called on the UI thread by InputLogic.
public void onCancelBatchInput() {
synchronized (mLock) {
mInBatchInput = false;
}
}
/**
* Finish a batch input.
*
* This fetches suggestions, updates the suggestion strip and commits the first suggestion.
* It also dismisses the floating text preview.
*
* @param batchPointers the updated batch pointers.
* @param sequenceNumber the sequence number associated with this batch input.
*/
// Called on the UI thread by InputLogic.
public void onEndBatchInput(final InputPointers batchPointers, final int sequenceNumber) {
updateBatchInput(batchPointers, sequenceNumber, true /* forEnd */);
}
public void getSuggestedWords(final int sessionId, final int sequenceNumber,
final OnGetSuggestedWordsCallback callback) {
mNonUIThreadHandler.obtainMessage(
MSG_GET_SUGGESTED_WORDS, sessionId, sequenceNumber, callback).sendToTarget();
}
}
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