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/*
* Copyright (C) 2012 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.util.Log;
import android.util.SparseIntArray;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.latin.define.DebugFlags;
import com.android.inputmethod.latin.utils.ResizableIntArray;
// TODO: This class is not thread-safe.
public final class InputPointers {
private static final String TAG = InputPointers.class.getSimpleName();
private static final boolean DEBUG_TIME = false;
private final int mDefaultCapacity;
private final ResizableIntArray mXCoordinates;
private final ResizableIntArray mYCoordinates;
private final ResizableIntArray mPointerIds;
private final ResizableIntArray mTimes;
public InputPointers(int defaultCapacity) {
mDefaultCapacity = defaultCapacity;
mXCoordinates = new ResizableIntArray(defaultCapacity);
mYCoordinates = new ResizableIntArray(defaultCapacity);
mPointerIds = new ResizableIntArray(defaultCapacity);
mTimes = new ResizableIntArray(defaultCapacity);
}
private void fillWithLastTimeUntil(final int index) {
final int fromIndex = mTimes.getLength();
// Fill the gap with the latest time.
// See {@link #getTime(int)} and {@link #isValidTimeStamps()}.
if (fromIndex <= 0) {
return;
}
final int fillLength = index - fromIndex + 1;
if (fillLength <= 0) {
return;
}
final int lastTime = mTimes.get(fromIndex - 1);
mTimes.fill(lastTime, fromIndex, fillLength);
}
public void addPointerAt(int index, int x, int y, int pointerId, int time) {
mXCoordinates.addAt(index, x);
mYCoordinates.addAt(index, y);
mPointerIds.addAt(index, pointerId);
if (DebugFlags.DEBUG_ENABLED || DEBUG_TIME) {
fillWithLastTimeUntil(index);
}
mTimes.addAt(index, time);
}
@UsedForTesting
void addPointer(int x, int y, int pointerId, int time) {
mXCoordinates.add(x);
mYCoordinates.add(y);
mPointerIds.add(pointerId);
mTimes.add(time);
}
public void set(InputPointers ip) {
mXCoordinates.set(ip.mXCoordinates);
mYCoordinates.set(ip.mYCoordinates);
mPointerIds.set(ip.mPointerIds);
mTimes.set(ip.mTimes);
}
public void copy(InputPointers ip) {
mXCoordinates.copy(ip.mXCoordinates);
mYCoordinates.copy(ip.mYCoordinates);
mPointerIds.copy(ip.mPointerIds);
mTimes.copy(ip.mTimes);
}
/**
* Append the times, x-coordinates and y-coordinates in the specified {@link ResizableIntArray}
* to the end of this.
* @param pointerId the pointer id of the source.
* @param times the source {@link ResizableIntArray} to read the event times from.
* @param xCoordinates the source {@link ResizableIntArray} to read the x-coordinates from.
* @param yCoordinates the source {@link ResizableIntArray} to read the y-coordinates from.
* @param startPos the starting index of the data in {@code times} and etc.
* @param length the number of data to be appended.
*/
public void append(int pointerId, ResizableIntArray times, ResizableIntArray xCoordinates,
ResizableIntArray yCoordinates, int startPos, int length) {
if (length == 0) {
return;
}
mXCoordinates.append(xCoordinates, startPos, length);
mYCoordinates.append(yCoordinates, startPos, length);
mPointerIds.fill(pointerId, mPointerIds.getLength(), length);
mTimes.append(times, startPos, length);
}
/**
* Shift to the left by elementCount, discarding elementCount pointers at the start.
* @param elementCount how many elements to shift.
*/
public void shift(final int elementCount) {
mXCoordinates.shift(elementCount);
mYCoordinates.shift(elementCount);
mPointerIds.shift(elementCount);
mTimes.shift(elementCount);
}
public void reset() {
final int defaultCapacity = mDefaultCapacity;
mXCoordinates.reset(defaultCapacity);
mYCoordinates.reset(defaultCapacity);
mPointerIds.reset(defaultCapacity);
mTimes.reset(defaultCapacity);
}
public int getPointerSize() {
return mXCoordinates.getLength();
}
public int[] getXCoordinates() {
return mXCoordinates.getPrimitiveArray();
}
public int[] getYCoordinates() {
return mYCoordinates.getPrimitiveArray();
}
public int[] getPointerIds() {
return mPointerIds.getPrimitiveArray();
}
/**
* Gets the time each point was registered, in milliseconds, relative to the first event in the
* sequence.
* @return The time each point was registered, in milliseconds, relative to the first event in
* the sequence.
*/
public int[] getTimes() {
if (DebugFlags.DEBUG_ENABLED || DEBUG_TIME) {
if (!isValidTimeStamps()) {
throw new RuntimeException("Time stamps are invalid.");
}
}
return mTimes.getPrimitiveArray();
}
@Override
public String toString() {
return "size=" + getPointerSize() + " id=" + mPointerIds + " time=" + mTimes
+ " x=" + mXCoordinates + " y=" + mYCoordinates;
}
private boolean isValidTimeStamps() {
final int[] times = mTimes.getPrimitiveArray();
final int[] pointerIds = mPointerIds.getPrimitiveArray();
final SparseIntArray lastTimeOfPointers = new SparseIntArray();
final int size = getPointerSize();
for (int i = 0; i < size; ++i) {
final int pointerId = pointerIds[i];
final int time = times[i];
final int lastTime = lastTimeOfPointers.get(pointerId, time);
if (time < lastTime) {
// dump
for (int j = 0; j < size; ++j) {
Log.d(TAG, "--- (" + j + ") " + times[j]);
}
return false;
}
lastTimeOfPointers.put(pointerId, time);
}
return true;
}
}
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