Initial implementation for dead keys (B3)

Bug: 5037589
Change-Id: I9e1ff92df7d0c58eb7a0f33603adebc9efb86585
main
Jean Chalard 2013-01-08 12:57:50 +09:00
parent 424d76fbf5
commit 6a26de1d7e
4 changed files with 105 additions and 0 deletions

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@ -0,0 +1,29 @@
/*
* 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.event;
/**
* A generic interface for combiners.
*/
public interface Combiner {
/**
* Combine an event with the existing state and return the new event.
* @param event the event to combine with the existing state.
* @return the resulting event.
*/
Event combine(Event event);
}

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@ -0,0 +1,61 @@
/*
* 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.event;
import android.text.TextUtils;
import android.view.KeyCharacterMap;
import com.android.inputmethod.latin.Constants;
/**
* A combiner that handles dead keys.
*/
public class DeadKeyCombiner implements Combiner {
final StringBuilder mDeadSequence = new StringBuilder();
@Override
public Event combine(final Event event) {
if (null == event) return null; // Just in case some combiner is broken
if (TextUtils.isEmpty(mDeadSequence)) {
if (event.isDead()) {
mDeadSequence.appendCodePoint(event.mCodePoint);
}
return event;
} else {
// TODO: Allow combining for several dead chars rather than only the first one.
// The framework doesn't know how to do this now.
final int deadCodePoint = mDeadSequence.codePointAt(0);
mDeadSequence.setLength(0);
final int resultingCodePoint =
KeyCharacterMap.getDeadChar(deadCodePoint, event.mCodePoint);
if (0 == resultingCodePoint) {
// We can't combine both characters. We need to commit the dead key as a committable
// character, and the next char too unless it's a space (because as a special case,
// dead key + space should result in only the dead key being committed - that's
// how dead keys work).
// If the event is a space, we should commit the dead char alone, but if it's
// not, we need to commit both.
return Event.createCommittableEvent(deadCodePoint,
Constants.CODE_SPACE == event.mCodePoint ? null : event /* next */);
} else {
// We could combine the characters.
return Event.createCommittableEvent(resultingCodePoint, null /* next */);
}
}
}
}

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@ -86,4 +86,8 @@ public class Event {
public boolean isCommittable() {
return EVENT_COMMITTABLE == mType;
}
public boolean isDead() {
return EVENT_DEAD == mType;
}
}

View File

@ -19,9 +19,12 @@ package com.android.inputmethod.event;
import android.util.SparseArray;
import android.view.KeyEvent;
import com.android.inputmethod.latin.CollectionUtils;
import com.android.inputmethod.latin.Constants;
import com.android.inputmethod.latin.LatinIME;
import java.util.ArrayList;
/**
* This class implements the logic between receiving events and generating code points.
*
@ -40,6 +43,7 @@ public class EventInterpreter {
final SparseArray<HardwareEventDecoder> mHardwareEventDecoders;
final SoftwareEventDecoder mSoftwareEventDecoder;
final LatinIME mLatinIme;
final ArrayList<Combiner> mCombiners;
/**
* Create a default interpreter.
@ -74,6 +78,8 @@ public class EventInterpreter {
// capacity of 1.
mHardwareEventDecoders = new SparseArray<HardwareEventDecoder>(1);
mSoftwareEventDecoder = new SoftwareKeyboardEventDecoder();
mCombiners = CollectionUtils.newArrayList();
mCombiners.add(new DeadKeyCombiner());
mLatinIme = latinIme;
}
@ -108,12 +114,17 @@ public class EventInterpreter {
private boolean onEvent(final Event event) {
Event currentlyProcessingEvent = event;
boolean processed = false;
for (int i = 0; i < mCombiners.size(); ++i) {
currentlyProcessingEvent = mCombiners.get(i).combine(event);
}
while (null != currentlyProcessingEvent) {
if (currentlyProcessingEvent.isCommittable()) {
mLatinIme.onCodeInput(currentlyProcessingEvent.mCodePoint,
Constants.EXTERNAL_KEYBOARD_COORDINATE,
Constants.EXTERNAL_KEYBOARD_COORDINATE);
processed = true;
} else if (event.isDead()) {
processed = true;
}
currentlyProcessingEvent = currentlyProcessingEvent.mNextEvent;
}