LatinIME/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionPar...

110 lines
5.8 KiB
Java
Raw Normal View History

/*
* 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.content.res.TypedArray;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.utils.ResourceUtils;
/**
* This class holds parameters to control how a gesture stroke is sampled and recognized.
* This class also has parameters to distinguish gesture input events from fast typing events.
*
* @attr ref R.styleable#MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping
* @attr ref R.styleable#MainKeyboardView_gestureDetectFastMoveSpeedThreshold
* @attr ref R.styleable#MainKeyboardView_gestureDynamicThresholdDecayDuration
* @attr ref R.styleable#MainKeyboardView_gestureDynamicTimeThresholdFrom
* @attr ref R.styleable#MainKeyboardView_gestureDynamicTimeThresholdTo
* @attr ref R.styleable#MainKeyboardView_gestureDynamicDistanceThresholdFrom
* @attr ref R.styleable#MainKeyboardView_gestureDynamicDistanceThresholdTo
* @attr ref R.styleable#MainKeyboardView_gestureSamplingMinimumDistance
* @attr ref R.styleable#MainKeyboardView_gestureRecognitionMinimumTime
* @attr ref R.styleable#MainKeyboardView_gestureRecognitionSpeedThreshold
*/
public final class GestureStrokeRecognitionParams {
// Static threshold for gesture after fast typing
public final int mStaticTimeThresholdAfterFastTyping; // msec
// Static threshold for starting gesture detection
public final float mDetectFastMoveSpeedThreshold; // keyWidth/sec
// Dynamic threshold for gesture after fast typing
public final int mDynamicThresholdDecayDuration; // msec
// Time based threshold values
public final int mDynamicTimeThresholdFrom; // msec
public final int mDynamicTimeThresholdTo; // msec
// Distance based threshold values
public final float mDynamicDistanceThresholdFrom; // keyWidth
public final float mDynamicDistanceThresholdTo; // keyWidth
// Parameters for gesture sampling
public final float mSamplingMinimumDistance; // keyWidth
// Parameters for gesture recognition
public final int mRecognitionMinimumTime; // msec
public final float mRecognitionSpeedThreshold; // keyWidth/sec
// Default GestureStrokeRecognitionPoints parameters.
public static final GestureStrokeRecognitionParams DEFAULT =
new GestureStrokeRecognitionParams();
private GestureStrokeRecognitionParams() {
// These parameter values are default and intended for testing.
mStaticTimeThresholdAfterFastTyping = 350; // msec
mDetectFastMoveSpeedThreshold = 1.5f; // keyWidth/sec
mDynamicThresholdDecayDuration = 450; // msec
mDynamicTimeThresholdFrom = 300; // msec
mDynamicTimeThresholdTo = 20; // msec
mDynamicDistanceThresholdFrom = 6.0f; // keyWidth
mDynamicDistanceThresholdTo = 0.35f; // keyWidth
// The following parameters' change will affect the result of regression test.
mSamplingMinimumDistance = 1.0f / 6.0f; // keyWidth
mRecognitionMinimumTime = 100; // msec
mRecognitionSpeedThreshold = 5.5f; // keyWidth/sec
}
public GestureStrokeRecognitionParams(final TypedArray mainKeyboardViewAttr) {
mStaticTimeThresholdAfterFastTyping = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping,
DEFAULT.mStaticTimeThresholdAfterFastTyping);
mDetectFastMoveSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
R.styleable.MainKeyboardView_gestureDetectFastMoveSpeedThreshold,
DEFAULT.mDetectFastMoveSpeedThreshold);
mDynamicThresholdDecayDuration = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_gestureDynamicThresholdDecayDuration,
DEFAULT.mDynamicThresholdDecayDuration);
mDynamicTimeThresholdFrom = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_gestureDynamicTimeThresholdFrom,
DEFAULT.mDynamicTimeThresholdFrom);
mDynamicTimeThresholdTo = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_gestureDynamicTimeThresholdTo,
DEFAULT.mDynamicTimeThresholdTo);
mDynamicDistanceThresholdFrom = ResourceUtils.getFraction(mainKeyboardViewAttr,
R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdFrom,
DEFAULT.mDynamicDistanceThresholdFrom);
mDynamicDistanceThresholdTo = ResourceUtils.getFraction(mainKeyboardViewAttr,
R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdTo,
DEFAULT.mDynamicDistanceThresholdTo);
mSamplingMinimumDistance = ResourceUtils.getFraction(mainKeyboardViewAttr,
R.styleable.MainKeyboardView_gestureSamplingMinimumDistance,
DEFAULT.mSamplingMinimumDistance);
mRecognitionMinimumTime = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_gestureRecognitionMinimumTime,
DEFAULT.mRecognitionMinimumTime);
mRecognitionSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
R.styleable.MainKeyboardView_gestureRecognitionSpeedThreshold,
DEFAULT.mRecognitionSpeedThreshold);
}
}