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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.view.KeyEvent;
import com.android.inputmethod.keyboard.KeyboardSwitcher;
import com.android.inputmethod.latin.settings.Settings;
/**
* A class for detecting Emoji-Alt physical key.
*/
final class EmojiAltPhysicalKeyDetector {
// True if the Alt key has been used as a modifier. In this case the Alt key up isn't
// recognized as an emoji key.
private boolean mAltHasBeenUsedAsAModifier;
/**
* Record a down key event.
* @param keyEvent a down key event.
*/
public void onKeyDown(final KeyEvent keyEvent) {
if (isAltKey(keyEvent)) {
mAltHasBeenUsedAsAModifier = false;
}
if (containsAltModifier(keyEvent)) {
mAltHasBeenUsedAsAModifier = true;
}
}
/**
* Determine whether an up key event is a special key up or not.
* @param keyEvent an up key event.
*/
public void onKeyUp(final KeyEvent keyEvent) {
if (keyEvent.isCanceled()) {
// This key up event was a part of key combinations and should be ignored.
return;
}
if (!isAltKey(keyEvent)) {
mAltHasBeenUsedAsAModifier |= containsAltModifier(keyEvent);
return;
}
if (containsAltModifier(keyEvent)) {
mAltHasBeenUsedAsAModifier = true;
return;
}
if (!Settings.getInstance().getCurrent().mEnableEmojiAltPhysicalKey) {
return;
}
if (!mAltHasBeenUsedAsAModifier) {
onEmojiAltKeyDetected();
}
}
private static void onEmojiAltKeyDetected() {
KeyboardSwitcher.getInstance().onToggleEmojiKeyboard();
}
private static boolean isAltKey(final KeyEvent keyEvent) {
final int keyCode = keyEvent.getKeyCode();
return keyCode == KeyEvent.KEYCODE_ALT_LEFT || keyCode == KeyEvent.KEYCODE_ALT_RIGHT;
}
private static boolean containsAltModifier(final KeyEvent keyEvent) {
final int metaState = keyEvent.getMetaState();
// TODO: Support multiple keyboards. Take device id into account.
switch (keyEvent.getKeyCode()) {
case KeyEvent.KEYCODE_ALT_LEFT:
// Return true if Left-Alt is pressed with Right-Alt pressed.
return (metaState & KeyEvent.META_ALT_RIGHT_ON) != 0;
case KeyEvent.KEYCODE_ALT_RIGHT:
// Return true if Right-Alt is pressed with Left-Alt pressed.
return (metaState & KeyEvent.META_ALT_LEFT_ON) != 0;
default:
return (metaState & (KeyEvent.META_ALT_LEFT_ON | KeyEvent.META_ALT_RIGHT_ON)) != 0;
}
}
}
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