/*
* 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.internal.widget;
import java.util.ArrayList;
import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.os.UserHandle;
import android.os.Vibrator;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import com.android.internal.R;
/**
* A special widget containing a center and outer ring. Moving the center ring to the outer ring
* causes an event that can be caught by implementing OnTriggerListener.
*/
public class WaveView extends View implements ValueAnimator.AnimatorUpdateListener {
private static final String TAG = "WaveView";
private static final boolean DBG = false;
private static final int WAVE_COUNT = 20; // default wave count
private static final long VIBRATE_SHORT = 20; // msec
private static final long VIBRATE_LONG = 20; // msec
// Lock state machine states
private static final int STATE_RESET_LOCK = 0;
private static final int STATE_READY = 1;
private static final int STATE_START_ATTEMPT = 2;
private static final int STATE_ATTEMPTING = 3;
private static final int STATE_UNLOCK_ATTEMPT = 4;
private static final int STATE_UNLOCK_SUCCESS = 5;
// Animation properties.
private static final long DURATION = 300; // duration of transitional animations
private static final long FINAL_DURATION = 200; // duration of final animations when unlocking
private static final long RING_DELAY = 1300; // when to start fading animated rings
private static final long FINAL_DELAY = 200; // delay for unlock success animation
private static final long SHORT_DELAY = 100; // for starting one animation after another.
private static final long WAVE_DURATION = 2000; // amount of time for way to expand/decay
private static final long RESET_TIMEOUT = 3000; // elapsed time of inactivity before we reset
private static final long DELAY_INCREMENT = 15; // increment per wave while tracking motion
private static final long DELAY_INCREMENT2 = 12; // increment per wave while not tracking
private static final long WAVE_DELAY = WAVE_DURATION / WAVE_COUNT; // initial propagation delay
/**
* The scale by which to multiply the unlock handle width to compute the radius
* in which it can be grabbed when accessibility is disabled.
*/
private static final float GRAB_HANDLE_RADIUS_SCALE_ACCESSIBILITY_DISABLED = 0.5f;
/**
* The scale by which to multiply the unlock handle width to compute the radius
* in which it can be grabbed when accessibility is enabled (more generous).
*/
private static final float GRAB_HANDLE_RADIUS_SCALE_ACCESSIBILITY_ENABLED = 1.0f;
private Vibrator mVibrator;
private OnTriggerListener mOnTriggerListener;
private ArrayList<DrawableHolder> mDrawables = new ArrayList<DrawableHolder>(3);
private ArrayList<DrawableHolder> mLightWaves = new ArrayList<DrawableHolder>(WAVE_COUNT);
private boolean mFingerDown = false;
private float mRingRadius = 182.0f; // Radius of bitmap ring. Used to snap halo to it
private int mSnapRadius = 136; // minimum threshold for drag unlock
private int mWaveCount = WAVE_COUNT; // number of waves
private long mWaveTimerDelay = WAVE_DELAY;
private int mCurrentWave = 0;
private float mLockCenterX; // center of widget as dictated by widget size
private float mLockCenterY;
private float mMouseX; // current mouse position as of last touch event
private float mMouseY;
private DrawableHolder mUnlockRing;
private DrawableHolder mUnlockDefault;
private DrawableHolder mUnlockHalo;
private int mLockState = STATE_RESET_LOCK;
private int mGrabbedState = OnTriggerListener.NO_HANDLE;
private boolean mWavesRunning;
private boolean mFinishWaves;
public WaveView(Context context) {
this(context, null);
}
public WaveView(Context context, AttributeSet attrs) {
super(context, attrs);
// TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.WaveView);
// mOrientation = a.getInt(R.styleable.WaveView_orientation, HORIZONTAL);
// a.recycle();
initDrawables();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mLockCenterX = 0.5f * w;
mLockCenterY = 0.5f * h;
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected int getSuggestedMinimumWidth() {
// View should be large enough to contain the unlock ring + halo
return mUnlockRing.getWidth() + mUnlockHalo.getWidth();
}
@Override
protected int getSuggestedMinimumHeight() {
// View should be large enough to contain the unlock ring + halo
return mUnlockRing.getHeight() + mUnlockHalo.getHeight();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
int width;
int height;
if (widthSpecMode == MeasureSpec.AT_MOST) {
width = Math.min(widthSpecSize, getSuggestedMinimumWidth());
} else if (widthSpecMode == MeasureSpec.EXACTLY) {
width = widthSpecSize;
} else {
width = getSuggestedMinimumWidth();
}
if (heightSpecMode == MeasureSpec.AT_MOST) {
height = Math.min(heightSpecSize, getSuggestedMinimumWidth());
} else if (heightSpecMode == MeasureSpec.EXACTLY) {
height = heightSpecSize;
} else {
height = getSuggestedMinimumHeight();
}
setMeasuredDimension(width, height);
}
private void initDrawables() {
mUnlockRing = new DrawableHolder(createDrawable(R.drawable.unlock_ring));
mUnlockRing.setX(mLockCenterX);
mUnlockRing.setY(mLockCenterY);
mUnlockRing.setScaleX(0.1f);
mUnlockRing.setScaleY(0.1f);
mUnlockRing.setAlpha(0.0f);
mDrawables.add(mUnlockRing);
mUnlockDefault = new DrawableHolder(createDrawable(R.drawable.unlock_default));
mUnlockDefault.setX(mLockCenterX);
mUnlockDefault.setY(mLockCenterY);
mUnlockDefault.setScaleX(0.1f);
mUnlockDefault.setScaleY(0.1f);
mUnlockDefault.setAlpha(0.0f);
mDrawables.add(mUnlockDefault);
mUnlockHalo = new DrawableHolder(createDrawable(R.drawable.unlock_halo));
mUnlockHalo.setX(mLockCenterX);
mUnlockHalo.setY(mLockCenterY);
mUnlockHalo.setScaleX(0.1f);
mUnlockHalo.setScaleY(0.1f);
mUnlockHalo.setAlpha(0.0f);
mDrawables.add(mUnlockHalo);
BitmapDrawable wave = createDrawable(R.drawable.unlock_wave);
for (int i = 0; i < mWaveCount; i++) {
DrawableHolder holder = new DrawableHolder(wave);
mLightWaves.add(holder);
holder.setAlpha(0.0f);
}
}
private void waveUpdateFrame(float mouseX, float mouseY, boolean fingerDown) {
double distX = mouseX - mLockCenterX;
double distY = mouseY - mLockCenterY;
int dragDistance = (int) Math.ceil(Math.hypot(distX, distY));
double touchA = Math.atan2(distX, distY);
float ringX = (float) (mLockCenterX + mRingRadius * Math.sin(touchA));
float ringY = (float) (mLockCenterY + mRingRadius * Math.cos(touchA));
switch (mLockState) {
case STATE_RESET_LOCK:
if (DBG) Log.v(TAG, "State RESET_LOCK");
mWaveTimerDelay = WAVE_DELAY;
for (int i = 0; i < mLightWaves.size(); i++) {
DrawableHolder holder = mLightWaves.get(i);
holder.addAnimTo(300, 0, "alpha", 0.0f, false);
}
for (int i = 0; i < mLightWaves.size(); i++) {
mLightWaves.get(i).startAnimations(this);
}
mUnlockRing.addAnimTo(DURATION, 0, "x", mLockCenterX, true);
mUnlockRing.addAnimTo(DURATION, 0, "y", mLockCenterY, true);
mUnlockRing.addAnimTo(DURATION, 0, "scaleX", 0.1f, true);
mUnlockRing.addAnimTo(DURATION, 0, "scaleY", 0.1f, true);
mUnlockRing.addAnimTo(DURATION, 0, "alpha", 0.0f, true);
mUnlockDefault.removeAnimationFor("x");
mUnlockDefault.removeAnimationFor("y");
mUnlockDefault.removeAnimationFor("scaleX");
mUnlockDefault.removeAnimationFor("scaleY");
mUnlockDefault.removeAnimationFor("alpha");
mUnlockDefault.setX(mLockCenterX);
mUnlockDefault.setY(mLockCenterY);
mUnlockDefault.setScaleX(0.1f);
mUnlockDefault.setScaleY(0.1f);
mUnlockDefault.setAlpha(0.0f);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "scaleX", 1.0f, true);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "scaleY", 1.0f, true);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "alpha", 1.0f, true);
mUnlockHalo.removeAnimationFor("x");
mUnlockHalo.removeAnimationFor("y");
mUnlockHalo.removeAnimationFor("scaleX");
mUnlockHalo.removeAnimationFor("scaleY");
mUnlockHalo.removeAnimationFor("alpha");
mUnlockHalo.setX(mLockCenterX);
mUnlockHalo.setY(mLockCenterY);
mUnlockHalo.setScaleX(0.1f);
mUnlockHalo.setScaleY(0.1f);
mUnlockHalo.setAlpha(0.0f);
mUnlockHalo.addAnimTo(DURATION, SHORT_DELAY, "x", mLockCenterX, true);
mUnlockHalo.addAnimTo(DURATION, SHORT_DELAY, "y", mLockCenterY, true);
mUnlockHalo.addAnimTo(DURATION, SHORT_DELAY, "scaleX", 1.0f, true);
mUnlockHalo.addAnimTo(DURATION, SHORT_DELAY, "scaleY", 1.0f, true);
mUnlockHalo.addAnimTo(DURATION, SHORT_DELAY, "alpha", 1.0f, true);
removeCallbacks(mLockTimerActions);
mLockState = STATE_READY;
break;
case STATE_READY:
if (DBG) Log.v(TAG, "State READY");
mWaveTimerDelay = WAVE_DELAY;
break;
case STATE_START_ATTEMPT:
if (DBG) Log.v(TAG, "State START_ATTEMPT");
mUnlockDefault.removeAnimationFor("x");
mUnlockDefault.removeAnimationFor("y");
mUnlockDefault.removeAnimationFor("scaleX");
mUnlockDefault.removeAnimationFor("scaleY");
mUnlockDefault.removeAnimationFor("alpha");
mUnlockDefault.setX(mLockCenterX + 182);
mUnlockDefault.setY(mLockCenterY);
mUnlockDefault.setScaleX(0.1f);
mUnlockDefault.setScaleY(0.1f);
mUnlockDefault.setAlpha(0.0f);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "scaleX", 1.0f, false);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "scaleY", 1.0f, false);
mUnlockDefault.addAnimTo(DURATION, SHORT_DELAY, "alpha", 1.0f, false);
mUnlockRing.addAnimTo(DURATION, 0, "scaleX", 1.0f, true);
mUnlockRing.addAnimTo(DURATION, 0, "scaleY", 1.0f, true);
mUnlockRing.addAnimTo(DURATION, 0, "alpha", 1.0f, true);
mLockState = STATE_ATTEMPTING;
break;
case STATE_ATTEMPTING:
if (DBG) Log.v(TAG, "State ATTEMPTING (fingerDown = " + fingerDown + ")");
if (dragDistance > mSnapRadius) {
mFinishWaves = true; // don't start any more waves.
if (fingerDown) {
mUnlockHalo.addAnimTo(0, 0, "x", ringX, true);
mUnlockHalo.addAnimTo(0, 0, "y", ringY, true);
mUnlockHalo.addAnimTo(0, 0, "scaleX", 1.0f, true);
mUnlockHalo.addAnimTo(0, 0, "scaleY", 1.0f, true);
mUnlockHalo.addAnimTo(0, 0, "alpha", 1.0f, true);
} else {
if (DBG) Log.v(TAG, "up detected, moving to STATE_UNLOCK_ATTEMPT");
mLockState = STATE_UNLOCK_ATTEMPT;
}
} else {
// If waves have stopped, we need to kick them off again...
if (!mWavesRunning) {
mWavesRunning = true;
mFinishWaves = false;
// mWaveTimerDelay = WAVE_DELAY;
postDelayed(mAddWaveAction, mWaveTimerDelay);
}
mUnlockHalo.addAnimTo(0, 0, "x", mouseX, true);
mUnlockHalo.addAnimTo(0, 0, "y", mouseY, true);
mUnlockHalo.addAnimTo(0, 0, "scaleX", 1.0f, true);
mUnlockHalo.addAnimTo(0, 0, "scaleY", 1.0f, true);
mUnlockHalo.addAnimTo(0, 0, "alpha", 1.0f, true);
}
break;
case STATE_UNLOCK_ATTEMPT:
if (DBG) Log.v(TAG, "State UNLOCK_ATTEMPT");
if (dragDistance > mSnapRadius) {
for (int n = 0; n < mLightWaves.size(); n++) {
DrawableHolder wave = mLightWaves.get(n);
long delay = 1000L*(6 + n - mCurrentWave)/10L;
wave.addAnimTo(FINAL_DURATION, delay, "x", ringX, true);
wave.addAnimTo(FINAL_DURATION, delay, "y", ringY, true);
wave.addAnimTo(FINAL_DURATION, delay, "scaleX", 0.1f, true);
wave.addAnimTo(FINAL_DURATION, delay, "scaleY", 0.1f, true);
wave.addAnimTo(FINAL_DURATION, delay, "alpha", 0.0f, true);
}
for (int i = 0; i < mLightWaves.size(); i++) {
mLightWaves.get(i).startAnimations(this);
}
mUnlockRing.addAnimTo(FINAL_DURATION, 0, "x", ringX, false);
mUnlockRing.addAnimTo(FINAL_DURATION, 0, "y", ringY, false);
mUnlockRing.addAnimTo(FINAL_DURATION, 0, "scaleX", 0.1f, false);
mUnlockRing.addAnimTo(FINAL_DURATION, 0, "scaleY", 0.1f, false);
mUnlockRing.addAnimTo(FINAL_DURATION, 0, "alpha", 0.0f, false);
mUnlockRing.addAnimTo(FINAL_DURATION, FINAL_DELAY, "alpha", 0.0f, false);
mUnlockDefault.removeAnimationFor("x");
mUnlockDefault.removeAnimationFor("y");
mUnlockDefault.removeAnimationFor("scaleX");
mUnlockDefault.removeAnimationFor("scaleY");
mUnlockDefault.removeAnimationFor("alpha");
mUnlockDefault.setX(ringX);
mUnlockDefault.setY(ringY);
mUnlockDefault.setScaleX(0.1f);
mUnlockDefault.setScaleY(0.1f);
mUnlockDefault.setAlpha(0.0f);
mUnlockDefault.addAnimTo(FINAL_DURATION, 0, "x", ringX, true);
mUnlockDefault.addAnimTo(FINAL_DURATION, 0, "y", ringY, true);
mUnlockDefault.addAnimTo(FINAL_DURATION, 0, "scaleX", 1.0f, true);
mUnlockDefault.addAnimTo(FINAL_DURATION, 0, "scaleY", 1.0f, true);
mUnlockDefault.addAnimTo(FINAL_DURATION, 0, "alpha", 1.0f, true);
mUnlockDefault.addAnimTo(FINAL_DURATION, FINAL_DELAY, "scaleX", 3.0f, false);
mUnlockDefault.addAnimTo(FINAL_DURATION, FINAL_DELAY, "scaleY", 3.0f, false);
mUnlockDefault.addAnimTo(FINAL_DURATION, FINAL_DELAY, "alpha", 0.0f, false);
mUnlockHalo.addAnimTo(FINAL_DURATION, 0, "x", ringX, false);
mUnlockHalo.addAnimTo(FINAL_DURATION, 0, "y", ringY, false);
mUnlockHalo.addAnimTo(FINAL_DURATION, FINAL_DELAY, "scaleX", 3.0f, false);
mUnlockHalo.addAnimTo(FINAL_DURATION, FINAL_DELAY, "scaleY", 3.0f, false);
mUnlockHalo.addAnimTo(FINAL_DURATION, FINAL_DELAY, "alpha", 0.0f, false);
removeCallbacks(mLockTimerActions);
postDelayed(mLockTimerActions, RESET_TIMEOUT);
dispatchTriggerEvent(OnTriggerListener.CENTER_HANDLE);
mLockState = STATE_UNLOCK_SUCCESS;
} else {
mLockState = STATE_RESET_LOCK;
}
break;
case STATE_UNLOCK_SUCCESS:
if (DBG) Log.v(TAG, "State UNLOCK_SUCCESS");
removeCallbacks(mAddWaveAction);
break;
default:
if (DBG) Log.v(TAG, "Unknown state " + mLockState);
break;
}
mUnlockDefault.startAnimations(this);
mUnlockHalo.startAnimations(this);
mUnlockRing.startAnimations(this);
}
BitmapDrawable createDrawable(int resId) {
Resources res = getResources();
Bitmap bitmap = BitmapFactory.decodeResource(res, resId);
return new BitmapDrawable(res, bitmap);
}
@Override
protected void onDraw(Canvas canvas) {
waveUpdateFrame(mMouseX, mMouseY, mFingerDown);
for (int i = 0; i < mDrawables.size(); ++i) {
mDrawables.get(i).draw(canvas);
}
for (int i = 0; i < mLightWaves.size(); ++i) {
mLightWaves.get(i).draw(canvas);
}
}
private final Runnable mLockTimerActions = new Runnable() {
public void run() {
if (DBG) Log.v(TAG, "LockTimerActions");
// reset lock after inactivity
if (mLockState == STATE_ATTEMPTING) {
if (DBG) Log.v(TAG, "Timer resets to STATE_RESET_LOCK");
mLockState = STATE_RESET_LOCK;
}
// for prototype, reset after successful unlock
if (mLockState == STATE_UNLOCK_SUCCESS) {
if (DBG) Log.v(TAG, "Timer resets to STATE_RESET_LOCK after success");
mLockState = STATE_RESET_LOCK;
}
invalidate();
}
};
private final Runnable mAddWaveAction = new Runnable() {
public void run() {
double distX = mMouseX - mLockCenterX;
double distY = mMouseY - mLockCenterY;
int dragDistance = (int) Math.ceil(Math.hypot(distX, distY));
if (mLockState == STATE_ATTEMPTING && dragDistance < mSnapRadius
&& mWaveTimerDelay >= WAVE_DELAY) {
mWaveTimerDelay = Math.min(WAVE_DURATION, mWaveTimerDelay + DELAY_INCREMENT);
DrawableHolder wave = mLightWaves.get(mCurrentWave);
wave.setAlpha(0.0f);
wave.setScaleX(0.2f);
wave.setScaleY(0.2f);
wave.setX(mMouseX);
wave.setY(mMouseY);
wave.addAnimTo(WAVE_DURATION, 0, "x", mLockCenterX, true);
wave.addAnimTo(WAVE_DURATION, 0, "y", mLockCenterY, true);
wave.addAnimTo(WAVE_DURATION*2/3, 0, "alpha", 1.0f, true);
wave.addAnimTo(WAVE_DURATION, 0, "scaleX", 1.0f, true);
wave.addAnimTo(WAVE_DURATION, 0, "scaleY", 1.0f, true);
wave.addAnimTo(1000, RING_DELAY, "alpha", 0.0f, false);
wave.startAnimations(WaveView.this);
mCurrentWave = (mCurrentWave+1) % mWaveCount;
if (DBG) Log.v(TAG, "WaveTimerDelay: start new wave in " + mWaveTimerDelay);
} else {
mWaveTimerDelay += DELAY_INCREMENT2;
}
if (mFinishWaves) {
// sentinel used to restart the waves after they've stopped
mWavesRunning = false;
} else {
postDelayed(mAddWaveAction, mWaveTimerDelay);
}
}
};
@Override
public boolean onHoverEvent(MotionEvent event) {
if (AccessibilityManager.getInstance(mContext).isTouchExplorationEnabled()) {
final int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_HOVER_ENTER:
event.setAction(MotionEvent.ACTION_DOWN);
break;
case MotionEvent.ACTION_HOVER_MOVE:
event.setAction(MotionEvent.ACTION_MOVE);
break;
case MotionEvent.ACTION_HOVER_EXIT:
event.setAction(MotionEvent.ACTION_UP);
break;
}
onTouchEvent(event);
event.setAction(action);
}
return super.onHoverEvent(event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
final int action = event.getAction();
mMouseX = event.getX();
mMouseY = event.getY();
boolean handled = false;
switch (action) {
case MotionEvent.ACTION_DOWN:
removeCallbacks(mLockTimerActions);
mFingerDown = true;
tryTransitionToStartAttemptState(event);
handled = true;
break;
case MotionEvent.ACTION_MOVE:
tryTransitionToStartAttemptState(event);
handled = true;
break;
case MotionEvent.ACTION_UP:
if (DBG) Log.v(TAG, "ACTION_UP");
mFingerDown = false;
postDelayed(mLockTimerActions, RESET_TIMEOUT);
setGrabbedState(OnTriggerListener.NO_HANDLE);
// Normally the state machine is driven by user interaction causing redraws.
// However, when there's no more user interaction and no running animations,
// the state machine stops advancing because onDraw() never gets called.
// The following ensures we advance to the next state in this case,
// either STATE_UNLOCK_ATTEMPT or STATE_RESET_LOCK.
waveUpdateFrame(mMouseX, mMouseY, mFingerDown);
handled = true;
break;
case MotionEvent.ACTION_CANCEL:
mFingerDown = false;
handled = true;
break;
}
invalidate();
return handled ? true : super.onTouchEvent(event);
}
/**
* Tries to transition to start attempt state.
*
* @param event A motion event.
*/
private void tryTransitionToStartAttemptState(MotionEvent event) {
final float dx = event.getX() - mUnlockHalo.getX();
final float dy = event.getY() - mUnlockHalo.getY();
float dist = (float) Math.hypot(dx, dy);
if (dist <= getScaledGrabHandleRadius()) {
setGrabbedState(OnTriggerListener.CENTER_HANDLE);
if (mLockState == STATE_READY) {
mLockState = STATE_START_ATTEMPT;
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
announceUnlockHandle();
}
}
}
}
/**
* @return The radius in which the handle is grabbed scaled based on
* whether accessibility is enabled.
*/
private float getScaledGrabHandleRadius() {
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
return GRAB_HANDLE_RADIUS_SCALE_ACCESSIBILITY_ENABLED * mUnlockHalo.getWidth();
} else {
return GRAB_HANDLE_RADIUS_SCALE_ACCESSIBILITY_DISABLED * mUnlockHalo.getWidth();
}
}
/**
* Announces the unlock handle if accessibility is enabled.
*/
private void announceUnlockHandle() {
setContentDescription(mContext.getString(R.string.description_target_unlock_tablet));
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
setContentDescription(null);
}
/**
* Triggers haptic feedback.
*/
private synchronized void vibrate(long duration) {
final boolean hapticEnabled = Settings.System.getIntForUser(
mContext.getContentResolver(), Settings.System.HAPTIC_FEEDBACK_ENABLED, 1,
UserHandle.USER_CURRENT) != 0;
if (hapticEnabled) {
if (mVibrator == null) {
mVibrator = (android.os.Vibrator) getContext()
.getSystemService(Context.VIBRATOR_SERVICE);
}
mVibrator.vibrate(duration);
}
}
/**
* Registers a callback to be invoked when the user triggers an event.
*
* @param listener the OnDialTriggerListener to attach to this view
*/
public void setOnTriggerListener(OnTriggerListener listener) {
mOnTriggerListener = listener;
}
/**
* Dispatches a trigger event to listener. Ignored if a listener is not set.
* @param whichHandle the handle that triggered the event.
*/
private void dispatchTriggerEvent(int whichHandle) {
vibrate(VIBRATE_LONG);
if (mOnTriggerListener != null) {
mOnTriggerListener.onTrigger(this, whichHandle);
}
}
/**
* Sets the current grabbed state, and dispatches a grabbed state change
* event to our listener.
*/
private void setGrabbedState(int newState) {
if (newState != mGrabbedState) {
mGrabbedState = newState;
if (mOnTriggerListener != null) {
mOnTriggerListener.onGrabbedStateChange(this, mGrabbedState);
}
}
}
public interface OnTriggerListener {
/**
* Sent when the user releases the handle.
*/
public static final int NO_HANDLE = 0;
/**
* Sent when the user grabs the center handle
*/
public static final int CENTER_HANDLE = 10;
/**
* Called when the user drags the center ring beyond a threshold.
*/
void onTrigger(View v, int whichHandle);
/**
* Called when the "grabbed state" changes (i.e. when the user either grabs or releases
* one of the handles.)
*
* @param v the view that was triggered
* @param grabbedState the new state: {@link #NO_HANDLE}, {@link #CENTER_HANDLE},
*/
void onGrabbedStateChange(View v, int grabbedState);
}
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
public void reset() {
if (DBG) Log.v(TAG, "reset() : resets state to STATE_RESET_LOCK");
mLockState = STATE_RESET_LOCK;
invalidate();
}
}