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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.keyboard.internal;
import android.text.TextUtils;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.latin.utils.CollectionUtils;
import java.util.ArrayDeque;
import java.util.Random;
/**
* This is a Keyboard class where you can add keys dynamically shown in a grid layout
*/
// TODO: Save/restore recent keys from/to preferences.
public class DynamicGridKeyboard extends Keyboard {
private static final int TEMPLATE_KEY_CODE_0 = 0x30;
private static final int TEMPLATE_KEY_CODE_1 = 0x31;
private final int mLeftPadding;
private final int mHorizontalStep;
private final int mVerticalStep;
private final int mColumnsNum;
private final int mMaxRecentKeyCount;
private final ArrayDeque<RecentKey> mRecentKeys = CollectionUtils.newArrayDeque();
private Key[] mCachedRecentKeys;
public DynamicGridKeyboard(final Keyboard templateKeyboard) {
super(templateKeyboard);
final Key key0 = getTemplateKey(TEMPLATE_KEY_CODE_0);
final Key key1 = getTemplateKey(TEMPLATE_KEY_CODE_1);
mLeftPadding = key0.getX();
mHorizontalStep = Math.abs(key1.getX() - key0.getX());
mVerticalStep = key0.getHeight() + mVerticalGap;
mColumnsNum = mBaseWidth / mHorizontalStep;
final int rowsNum = mBaseHeight / mVerticalStep;
mMaxRecentKeyCount = mColumnsNum * rowsNum;
}
private Key getTemplateKey(final int code) {
for (final Key key : super.getKeys()) {
if (key.getCode() == code) {
return key;
}
}
throw new RuntimeException("Can't find template key: code=" + code);
}
private final Random random = new Random();
public void addRecentKey(final Key usedKey) {
synchronized (mRecentKeys) {
mCachedRecentKeys = null;
final RecentKey key = (usedKey instanceof RecentKey)
? (RecentKey)usedKey : new RecentKey(usedKey);
while (mRecentKeys.remove(key)) {
// Remove duplicate keys.
}
mRecentKeys.addFirst(key);
while (mRecentKeys.size() > mMaxRecentKeyCount) {
mRecentKeys.removeLast();
}
int index = 0;
for (final RecentKey recentKey : mRecentKeys) {
final int keyX = getKeyX(index);
final int keyY = getKeyY(index);
final int x = keyX+random.nextInt(recentKey.getWidth());
final int y = keyY+random.nextInt(recentKey.getHeight());
recentKey.updateCorrdinates(keyX, keyY);
index++;
}
}
}
private int getKeyX(final int index) {
final int column = index % mColumnsNum;
return column * mHorizontalStep + mLeftPadding;
}
private int getKeyY(final int index) {
final int row = index / mColumnsNum;
return row * mVerticalStep + mTopPadding;
}
@Override
public Key[] getKeys() {
synchronized (mRecentKeys) {
if (mCachedRecentKeys != null) {
return mCachedRecentKeys;
}
mCachedRecentKeys = mRecentKeys.toArray(new Key[mRecentKeys.size()]);
return mCachedRecentKeys;
}
}
@Override
public Key[] getNearestKeys(final int x, final int y) {
// TODO: Calculate the nearest key index in mRecentKeys from x and y.
return getKeys();
}
static final class RecentKey extends Key {
private int mCurrentX;
private int mCurrentY;
public RecentKey(final Key originalKey) {
super(originalKey);
}
public void updateCorrdinates(final int x, final int y) {
mCurrentX = x;
mCurrentY = y;
getHitBox().offsetTo(x, y);
}
@Override
public int getX() {
return mCurrentX;
}
@Override
public int getY() {
return mCurrentY;
}
@Override
public boolean equals(final Object o) {
if (!(o instanceof Key)) return false;
final Key key = (Key)o;
if (getCode() != key.getCode()) return false;
if (!TextUtils.equals(getLabel(), key.getLabel())) return false;
return TextUtils.equals(getOutputText(), key.getOutputText());
}
@Override
public String toString() {
return "RecentKey: " + super.toString();
}
}
}
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