62 lines
2.5 KiB
Java
62 lines
2.5 KiB
Java
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.event;
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import android.text.TextUtils;
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import android.view.KeyCharacterMap;
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import com.android.inputmethod.latin.Constants;
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/**
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* A combiner that handles dead keys.
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*/
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public class DeadKeyCombiner implements Combiner {
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final StringBuilder mDeadSequence = new StringBuilder();
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@Override
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public Event combine(final Event event) {
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if (null == event) return null; // Just in case some combiner is broken
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if (TextUtils.isEmpty(mDeadSequence)) {
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if (event.isDead()) {
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mDeadSequence.appendCodePoint(event.mCodePoint);
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}
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return event;
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} else {
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// TODO: Allow combining for several dead chars rather than only the first one.
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// The framework doesn't know how to do this now.
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final int deadCodePoint = mDeadSequence.codePointAt(0);
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mDeadSequence.setLength(0);
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final int resultingCodePoint =
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KeyCharacterMap.getDeadChar(deadCodePoint, event.mCodePoint);
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if (0 == resultingCodePoint) {
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// We can't combine both characters. We need to commit the dead key as a committable
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// character, and the next char too unless it's a space (because as a special case,
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// dead key + space should result in only the dead key being committed - that's
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// how dead keys work).
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// If the event is a space, we should commit the dead char alone, but if it's
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// not, we need to commit both.
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return Event.createCommittableEvent(deadCodePoint,
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Constants.CODE_SPACE == event.mCodePoint ? null : event /* next */);
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} else {
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// We could combine the characters.
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return Event.createCommittableEvent(resultingCodePoint, null /* next */);
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}
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}
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}
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}
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