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/*
* Copyright (C) 2010 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.util.Log;
import java.util.ArrayList;
public final class PointerTrackerQueue {
private static final String TAG = PointerTrackerQueue.class.getSimpleName();
private static final boolean DEBUG = false;
public interface Element {
public boolean isModifier();
public boolean isInDraggingFinger();
public void onPhantomUpEvent(long eventTime);
public void cancelTrackingForAction();
}
private static final int INITIAL_CAPACITY = 10;
// Note: {@link #mExpandableArrayOfActivePointers} and {@link #mArraySize} are synchronized by
// {@link #mExpandableArrayOfActivePointers}
private final ArrayList<Element> mExpandableArrayOfActivePointers =
new ArrayList<>(INITIAL_CAPACITY);
private int mArraySize = 0;
public int size() {
synchronized (mExpandableArrayOfActivePointers) {
return mArraySize;
}
}
public void add(final Element pointer) {
synchronized (mExpandableArrayOfActivePointers) {
if (DEBUG) {
Log.d(TAG, "add: " + pointer + " " + this);
}
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
if (arraySize < expandableArray.size()) {
expandableArray.set(arraySize, pointer);
} else {
expandableArray.add(pointer);
}
mArraySize = arraySize + 1;
}
}
public void remove(final Element pointer) {
synchronized (mExpandableArrayOfActivePointers) {
if (DEBUG) {
Log.d(TAG, "remove: " + pointer + " " + this);
}
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
int newIndex = 0;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element == pointer) {
if (newIndex != index) {
Log.w(TAG, "Found duplicated element in remove: " + pointer);
}
continue; // Remove this element from the expandableArray.
}
if (newIndex != index) {
// Shift this element toward the beginning of the expandableArray.
expandableArray.set(newIndex, element);
}
newIndex++;
}
mArraySize = newIndex;
}
}
public Element getOldestElement() {
synchronized (mExpandableArrayOfActivePointers) {
return (mArraySize == 0) ? null : mExpandableArrayOfActivePointers.get(0);
}
}
public void releaseAllPointersOlderThan(final Element pointer, final long eventTime) {
synchronized (mExpandableArrayOfActivePointers) {
if (DEBUG) {
Log.d(TAG, "releaseAllPoniterOlderThan: " + pointer + " " + this);
}
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
int newIndex, index;
for (newIndex = index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element == pointer) {
break; // Stop releasing elements.
}
if (!element.isModifier()) {
element.onPhantomUpEvent(eventTime);
continue; // Remove this element from the expandableArray.
}
if (newIndex != index) {
// Shift this element toward the beginning of the expandableArray.
expandableArray.set(newIndex, element);
}
newIndex++;
}
// Shift rest of the expandableArray.
int count = 0;
for (; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element == pointer) {
count++;
if (count > 1) {
Log.w(TAG, "Found duplicated element in releaseAllPointersOlderThan: "
+ pointer);
}
}
if (newIndex != index) {
// Shift this element toward the beginning of the expandableArray.
expandableArray.set(newIndex, expandableArray.get(index));
}
newIndex++;
}
mArraySize = newIndex;
}
}
public void releaseAllPointers(final long eventTime) {
releaseAllPointersExcept(null, eventTime);
}
public void releaseAllPointersExcept(final Element pointer, final long eventTime) {
synchronized (mExpandableArrayOfActivePointers) {
if (DEBUG) {
if (pointer == null) {
Log.d(TAG, "releaseAllPoniters: " + this);
} else {
Log.d(TAG, "releaseAllPoniterExcept: " + pointer + " " + this);
}
}
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
int newIndex = 0, count = 0;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element == pointer) {
count++;
if (count > 1) {
Log.w(TAG, "Found duplicated element in releaseAllPointersExcept: "
+ pointer);
}
} else {
element.onPhantomUpEvent(eventTime);
continue; // Remove this element from the expandableArray.
}
if (newIndex != index) {
// Shift this element toward the beginning of the expandableArray.
expandableArray.set(newIndex, element);
}
newIndex++;
}
mArraySize = newIndex;
}
}
public boolean hasModifierKeyOlderThan(final Element pointer) {
synchronized (mExpandableArrayOfActivePointers) {
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element == pointer) {
return false; // Stop searching modifier key.
}
if (element.isModifier()) {
return true;
}
}
return false;
}
}
public boolean isAnyInDraggingFinger() {
synchronized (mExpandableArrayOfActivePointers) {
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (element.isInDraggingFinger()) {
return true;
}
}
return false;
}
}
public void cancelAllPointerTrackers() {
synchronized (mExpandableArrayOfActivePointers) {
if (DEBUG) {
Log.d(TAG, "cancelAllPointerTracker: " + this);
}
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
element.cancelTrackingForAction();
}
}
}
@Override
public String toString() {
synchronized (mExpandableArrayOfActivePointers) {
final StringBuilder sb = new StringBuilder();
final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
final int arraySize = mArraySize;
for (int index = 0; index < arraySize; index++) {
final Element element = expandableArray.get(index);
if (sb.length() > 0) {
sb.append(" ");
}
sb.append(element.toString());
}
return "[" + sb.toString() + "]";
}
}
}
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