Refactor SwipeTracker to top level class
Bug: 2910379 Change-Id: If0ef09d8b0e7ca1c62b4c5a31bcaa620664868f2
This commit is contained in:
Tadashi G. Takaoka
parent
15d5dc532f
commit
05d1904ed7
2 changed files with 133 additions and 110 deletions
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@ -1532,114 +1532,4 @@ public class LatinKeyboardBaseView extends View implements View.OnClickListener
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resetMultiTap();
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}
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}
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private static class SwipeTracker {
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static final int NUM_PAST = 4;
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static final int LONGEST_PAST_TIME = 200;
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final float mPastX[] = new float[NUM_PAST];
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final float mPastY[] = new float[NUM_PAST];
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final long mPastTime[] = new long[NUM_PAST];
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float mYVelocity;
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float mXVelocity;
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public void clear() {
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mPastTime[0] = 0;
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}
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public void addMovement(MotionEvent ev) {
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long time = ev.getEventTime();
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final int N = ev.getHistorySize();
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for (int i=0; i<N; i++) {
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addPoint(ev.getHistoricalX(i), ev.getHistoricalY(i),
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ev.getHistoricalEventTime(i));
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}
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addPoint(ev.getX(), ev.getY(), time);
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}
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private void addPoint(float x, float y, long time) {
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int drop = -1;
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int i;
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final long[] pastTime = mPastTime;
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for (i=0; i<NUM_PAST; i++) {
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if (pastTime[i] == 0) {
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break;
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} else if (pastTime[i] < time-LONGEST_PAST_TIME) {
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drop = i;
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}
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}
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if (i == NUM_PAST && drop < 0) {
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drop = 0;
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}
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if (drop == i) drop--;
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final float[] pastX = mPastX;
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final float[] pastY = mPastY;
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if (drop >= 0) {
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final int start = drop+1;
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final int count = NUM_PAST-drop-1;
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System.arraycopy(pastX, start, pastX, 0, count);
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System.arraycopy(pastY, start, pastY, 0, count);
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System.arraycopy(pastTime, start, pastTime, 0, count);
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i -= (drop+1);
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}
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pastX[i] = x;
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pastY[i] = y;
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pastTime[i] = time;
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i++;
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if (i < NUM_PAST) {
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pastTime[i] = 0;
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}
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}
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public void computeCurrentVelocity(int units) {
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computeCurrentVelocity(units, Float.MAX_VALUE);
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}
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public void computeCurrentVelocity(int units, float maxVelocity) {
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final float[] pastX = mPastX;
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final float[] pastY = mPastY;
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final long[] pastTime = mPastTime;
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final float oldestX = pastX[0];
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final float oldestY = pastY[0];
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final long oldestTime = pastTime[0];
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float accumX = 0;
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float accumY = 0;
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int N=0;
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while (N < NUM_PAST) {
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if (pastTime[N] == 0) {
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break;
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}
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N++;
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}
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for (int i=1; i < N; i++) {
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final int dur = (int)(pastTime[i] - oldestTime);
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if (dur == 0) continue;
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float dist = pastX[i] - oldestX;
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float vel = (dist/dur) * units; // pixels/frame.
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if (accumX == 0) accumX = vel;
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else accumX = (accumX + vel) * .5f;
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dist = pastY[i] - oldestY;
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vel = (dist/dur) * units; // pixels/frame.
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if (accumY == 0) accumY = vel;
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else accumY = (accumY + vel) * .5f;
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}
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mXVelocity = accumX < 0.0f ? Math.max(accumX, -maxVelocity)
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: Math.min(accumX, maxVelocity);
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mYVelocity = accumY < 0.0f ? Math.max(accumY, -maxVelocity)
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: Math.min(accumY, maxVelocity);
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}
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public float getXVelocity() {
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return mXVelocity;
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}
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public float getYVelocity() {
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return mYVelocity;
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}
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}
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}
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133
java/src/com/android/inputmethod/latin/SwipeTracker.java
Normal file
133
java/src/com/android/inputmethod/latin/SwipeTracker.java
Normal file
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@ -0,0 +1,133 @@
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/*
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* Copyright (C) 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.view.MotionEvent;
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class SwipeTracker {
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static final int NUM_PAST = 4;
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static final int LONGEST_PAST_TIME = 200;
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final float mPastX[] = new float[NUM_PAST];
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final float mPastY[] = new float[NUM_PAST];
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final long mPastTime[] = new long[NUM_PAST];
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float mYVelocity;
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float mXVelocity;
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public void clear() {
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mPastTime[0] = 0;
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}
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public void addMovement(MotionEvent ev) {
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if (ev.getAction() == MotionEvent.ACTION_DOWN) {
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clear();
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return;
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}
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long time = ev.getEventTime();
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final int N = ev.getHistorySize();
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for (int i=0; i<N; i++) {
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addPoint(ev.getHistoricalX(i), ev.getHistoricalY(i),
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ev.getHistoricalEventTime(i));
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}
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addPoint(ev.getX(), ev.getY(), time);
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}
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private void addPoint(float x, float y, long time) {
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int drop = -1;
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int i;
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final long[] pastTime = mPastTime;
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for (i=0; i<NUM_PAST; i++) {
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if (pastTime[i] == 0) {
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break;
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} else if (pastTime[i] < time-LONGEST_PAST_TIME) {
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drop = i;
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}
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}
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if (i == NUM_PAST && drop < 0) {
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drop = 0;
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}
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if (drop == i) drop--;
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final float[] pastX = mPastX;
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final float[] pastY = mPastY;
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if (drop >= 0) {
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final int start = drop+1;
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final int count = NUM_PAST-drop-1;
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System.arraycopy(pastX, start, pastX, 0, count);
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System.arraycopy(pastY, start, pastY, 0, count);
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System.arraycopy(pastTime, start, pastTime, 0, count);
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i -= (drop+1);
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}
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pastX[i] = x;
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pastY[i] = y;
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pastTime[i] = time;
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i++;
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if (i < NUM_PAST) {
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pastTime[i] = 0;
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}
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}
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public void computeCurrentVelocity(int units) {
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computeCurrentVelocity(units, Float.MAX_VALUE);
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}
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public void computeCurrentVelocity(int units, float maxVelocity) {
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final float[] pastX = mPastX;
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final float[] pastY = mPastY;
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final long[] pastTime = mPastTime;
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final float oldestX = pastX[0];
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final float oldestY = pastY[0];
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final long oldestTime = pastTime[0];
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float accumX = 0;
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float accumY = 0;
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int N=0;
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while (N < NUM_PAST) {
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if (pastTime[N] == 0) {
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break;
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}
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N++;
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}
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for (int i=1; i < N; i++) {
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final int dur = (int)(pastTime[i] - oldestTime);
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if (dur == 0) continue;
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float dist = pastX[i] - oldestX;
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float vel = (dist/dur) * units; // pixels/frame.
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if (accumX == 0) accumX = vel;
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else accumX = (accumX + vel) * .5f;
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dist = pastY[i] - oldestY;
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vel = (dist/dur) * units; // pixels/frame.
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if (accumY == 0) accumY = vel;
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else accumY = (accumY + vel) * .5f;
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}
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mXVelocity = accumX < 0.0f ? Math.max(accumX, -maxVelocity)
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: Math.min(accumX, maxVelocity);
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mYVelocity = accumY < 0.0f ? Math.max(accumY, -maxVelocity)
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: Math.min(accumY, maxVelocity);
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}
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public float getXVelocity() {
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return mXVelocity;
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}
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public float getYVelocity() {
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return mYVelocity;
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}
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}
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