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/*
* Copyright (C) 2014, 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;
import android.content.res.Resources;
import android.util.Log;
import android.view.KeyEvent;
import com.android.inputmethod.keyboard.KeyboardSwitcher;
import com.android.inputmethod.latin.settings.Settings;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nonnull;
/**
* A class for detecting Emoji-Alt physical key.
*/
final class EmojiAltPhysicalKeyDetector {
private static final String TAG = "EmojiAltPhysicalKeyDetector";
private final Map<Integer, Integer> mEmojiSwitcherMap;
private final Map<Integer, Integer> mSymbolsShiftedSwitcherMap;
private final Map<Integer, Integer> mCombinedSwitcherMap;
// Set of keys codes that have been used as modifiers.
private Set<Integer> mActiveModifiers;
public EmojiAltPhysicalKeyDetector(@Nonnull final Resources resources) {
mEmojiSwitcherMap = parseSwitchDefinition(resources, R.array.keyboard_switcher_emoji);
mSymbolsShiftedSwitcherMap = parseSwitchDefinition(
resources, R.array.keyboard_switcher_symbols_shifted);
mCombinedSwitcherMap = new HashMap<>();
mCombinedSwitcherMap.putAll(mEmojiSwitcherMap);
mCombinedSwitcherMap.putAll(mSymbolsShiftedSwitcherMap);
mActiveModifiers = new HashSet<>();
}
private static Map<Integer, Integer> parseSwitchDefinition(
@Nonnull final Resources resources,
final int resourceId) {
final Map<Integer, Integer> definition = new HashMap<>();
final String name = resources.getResourceEntryName(resourceId);
final String[] values = resources.getStringArray(resourceId);
for (int i = 0; values != null && i < values.length; i++) {
String[] valuePair = values[i].split(",");
if (valuePair.length != 2) {
Log.w(TAG, "Expected 2 integers in " + name + "[" + i + "] : " + values[i]);
}
try {
definition.put(Integer.parseInt(valuePair[0]), Integer.parseInt(valuePair[1]));
} catch (NumberFormatException e) {
Log.w(TAG, "Failed to parse " + name + "[" + i + "] : " + values[i], e);
}
}
return definition;
}
/**
* Determine whether an up key event came from a mapped modifier key.
*
* @param keyEvent an up key event.
*/
public void onKeyUp(@Nonnull final KeyEvent keyEvent) {
Log.d(TAG, "onKeyUp() : " + keyEvent);
if (!Settings.getInstance().getCurrent().mEnableEmojiAltPhysicalKey) {
// The feature is disabled.
Log.d(TAG, "onKeyUp() : Disabled");
return;
}
if (keyEvent.isCanceled()) {
// This key up event was a part of key combinations and should be ignored.
Log.d(TAG, "onKeyUp() : Canceled");
return;
}
final Integer mappedModifier = getMappedModifier(keyEvent);
if (mappedModifier != null) {
// If the key was modified by a mapped key, then ignore the next time
// the same modifier key comes up.
Log.d(TAG, "onKeyUp() : Using Modifier: " + mappedModifier);
mActiveModifiers.add(mappedModifier);
return;
}
final int keyCode = keyEvent.getKeyCode();
if (mActiveModifiers.contains(keyCode)) {
// Used as a modifier, not a standalone key press.
Log.d(TAG, "onKeyUp() : Used as Modifier: " + keyCode);
mActiveModifiers.remove(keyCode);
return;
}
if (!isMappedKeyCode(keyEvent)) {
// Nothing special about this key.
Log.d(TAG, "onKeyUp() : Not Mapped: " + keyCode);
return;
}
final KeyboardSwitcher switcher = KeyboardSwitcher.getInstance();
if (mEmojiSwitcherMap.keySet().contains(keyCode)) {
switcher.onToggleKeyboard(KeyboardSwitcher.KeyboardSwitchState.EMOJI);
} else if (mSymbolsShiftedSwitcherMap.keySet().contains(keyCode)) {
switcher.onToggleKeyboard(KeyboardSwitcher.KeyboardSwitchState.SYMBOLS_SHIFTED);
} else {
Log.w(TAG, "Cannot toggle on keyCode: " + keyCode);
}
}
/**
* @param keyEvent pressed key event
* @return true iff the user pressed a mapped modifier key.
*/
private boolean isMappedKeyCode(@Nonnull final KeyEvent keyEvent) {
return mCombinedSwitcherMap.get(keyEvent.getKeyCode()) != null;
}
/**
* @param keyEvent pressed key event
* @return the mapped modifier used with this key opress, if any.
*/
private Integer getMappedModifier(@Nonnull final KeyEvent keyEvent) {
final int keyCode = keyEvent.getKeyCode();
final int metaState = keyEvent.getMetaState();
for (int mappedKeyCode : mCombinedSwitcherMap.keySet()) {
if (keyCode == mappedKeyCode) {
Log.d(TAG, "getMappedModifier() : KeyCode = MappedKeyCode = " + mappedKeyCode);
continue;
}
final Integer mappedMeta = mCombinedSwitcherMap.get(mappedKeyCode);
if (mappedMeta == null || mappedMeta.intValue() == -1) {
continue;
}
if ((metaState & mappedMeta) != 0) {
Log.d(TAG, "getMappedModifier() : MetaState(" + metaState
+ ") contains MappedMeta(" + mappedMeta + ")");
return mappedKeyCode;
}
}
return null;
}
}
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