1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.systemui.statusbar.phone;
18
19import com.android.systemui.R;
20
21import android.animation.Animator;
22import android.animation.AnimatorListenerAdapter;
23import android.animation.AnimatorSet;
24import android.animation.ValueAnimator;
25import android.content.Context;
26import android.content.res.Resources;
27import android.graphics.Canvas;
28import android.graphics.Color;
29import android.graphics.ColorFilter;
30import android.graphics.Paint;
31import android.graphics.PixelFormat;
32import android.graphics.Rect;
33import android.graphics.drawable.Drawable;
34import android.view.animation.AccelerateDecelerateInterpolator;
35import android.view.animation.AnimationUtils;
36import android.view.animation.Interpolator;
37
38public class TrustDrawable extends Drawable {
39
40    private static final long ENTERING_FROM_UNSET_START_DELAY = 200;
41    private static final long VISIBLE_DURATION = 1000;
42    private static final long EXIT_DURATION = 500;
43    private static final long ENTER_DURATION = 500;
44
45    private static final int ALPHA_VISIBLE_MIN = 0x26;
46    private static final int ALPHA_VISIBLE_MAX = 0x4c;
47
48    private static final int STATE_UNSET = -1;
49    private static final int STATE_GONE = 0;
50    private static final int STATE_ENTERING = 1;
51    private static final int STATE_VISIBLE = 2;
52    private static final int STATE_EXITING = 3;
53
54    private int mAlpha;
55    private boolean mAnimating;
56
57    private int mCurAlpha;
58    private float mCurInnerRadius;
59    private Animator mCurAnimator;
60    private int mState = STATE_UNSET;
61    private Paint mPaint;
62    private boolean mTrustManaged;
63
64    private final float mInnerRadiusVisibleMin;
65    private final float mInnerRadiusVisibleMax;
66    private final float mInnerRadiusExit;
67    private final float mInnerRadiusEnter;
68    private final float mThickness;
69
70    private final Animator mVisibleAnimator;
71
72    private final Interpolator mLinearOutSlowInInterpolator;
73    private final Interpolator mFastOutSlowInInterpolator;
74    private final Interpolator mAccelerateDecelerateInterpolator;
75
76    public TrustDrawable(Context context) {
77        Resources r = context.getResources();
78        mInnerRadiusVisibleMin = r.getDimension(R.dimen.trust_circle_inner_radius_visible_min);
79        mInnerRadiusVisibleMax = r.getDimension(R.dimen.trust_circle_inner_radius_visible_max);
80        mInnerRadiusExit = r.getDimension(R.dimen.trust_circle_inner_radius_exit);
81        mInnerRadiusEnter = r.getDimension(R.dimen.trust_circle_inner_radius_enter);
82        mThickness = r.getDimension(R.dimen.trust_circle_thickness);
83
84        mCurInnerRadius = mInnerRadiusEnter;
85
86        mLinearOutSlowInInterpolator = AnimationUtils.loadInterpolator(
87                context, android.R.interpolator.linear_out_slow_in);
88        mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(
89                context, android.R.interpolator.fast_out_slow_in);
90        mAccelerateDecelerateInterpolator = new AccelerateDecelerateInterpolator();
91
92        mVisibleAnimator = makeVisibleAnimator();
93
94        mPaint = new Paint();
95        mPaint.setStyle(Paint.Style.STROKE);
96        mPaint.setColor(Color.WHITE);
97        mPaint.setAntiAlias(true);
98        mPaint.setStrokeWidth(mThickness);
99    }
100
101    @Override
102    public void draw(Canvas canvas) {
103        int newAlpha = (mCurAlpha * mAlpha) / 256;
104        if (newAlpha == 0) {
105            return;
106        }
107        final Rect r = getBounds();
108        mPaint.setAlpha(newAlpha);
109        canvas.drawCircle(r.exactCenterX(), r.exactCenterY(), mCurInnerRadius, mPaint);
110    }
111
112    @Override
113    public void setAlpha(int alpha) {
114        mAlpha = alpha;
115    }
116
117    @Override
118    public int getAlpha() {
119        return mAlpha;
120    }
121
122    @Override
123    public void setColorFilter(ColorFilter cf) {
124        throw new UnsupportedOperationException("not implemented");
125    }
126
127    @Override
128    public int getOpacity() {
129        return PixelFormat.TRANSLUCENT;
130    }
131
132    public void start() {
133        if (!mAnimating) {
134            mAnimating = true;
135            updateState(true);
136            invalidateSelf();
137        }
138    }
139
140    public void stop() {
141        if (mAnimating) {
142            mAnimating = false;
143            if (mCurAnimator != null) {
144                mCurAnimator.cancel();
145                mCurAnimator = null;
146            }
147            mState = STATE_UNSET;
148            mCurAlpha = 0;
149            mCurInnerRadius = mInnerRadiusEnter;
150            invalidateSelf();
151        }
152    }
153
154    public void setTrustManaged(boolean trustManaged) {
155        if (trustManaged == mTrustManaged && mState != STATE_UNSET) return;
156        mTrustManaged = trustManaged;
157        updateState(true);
158    }
159
160    private void updateState(boolean allowTransientState) {
161        if (!mAnimating) {
162            return;
163        }
164
165        int nextState = mState;
166        if (mState == STATE_UNSET) {
167            nextState = mTrustManaged ? STATE_ENTERING : STATE_GONE;
168        } else if (mState == STATE_GONE) {
169            if (mTrustManaged) nextState = STATE_ENTERING;
170        } else if (mState == STATE_ENTERING) {
171            if (!mTrustManaged) nextState = STATE_EXITING;
172        } else if (mState == STATE_VISIBLE) {
173            if (!mTrustManaged) nextState = STATE_EXITING;
174        } else if (mState == STATE_EXITING) {
175            if (mTrustManaged) nextState = STATE_ENTERING;
176        }
177        if (!allowTransientState) {
178            if (nextState == STATE_ENTERING) nextState = STATE_VISIBLE;
179            if (nextState == STATE_EXITING) nextState = STATE_GONE;
180        }
181
182        if (nextState != mState) {
183            if (mCurAnimator != null) {
184                mCurAnimator.cancel();
185                mCurAnimator = null;
186            }
187
188            if (nextState == STATE_GONE) {
189                mCurAlpha = 0;
190                mCurInnerRadius = mInnerRadiusEnter;
191            } else if (nextState == STATE_ENTERING) {
192                mCurAnimator = makeEnterAnimator(mCurInnerRadius, mCurAlpha);
193                if (mState == STATE_UNSET) {
194                    mCurAnimator.setStartDelay(ENTERING_FROM_UNSET_START_DELAY);
195                }
196            } else if (nextState == STATE_VISIBLE) {
197                mCurAlpha = ALPHA_VISIBLE_MAX;
198                mCurInnerRadius = mInnerRadiusVisibleMax;
199                mCurAnimator = mVisibleAnimator;
200            } else if (nextState == STATE_EXITING) {
201                mCurAnimator = makeExitAnimator(mCurInnerRadius, mCurAlpha);
202            }
203
204            mState = nextState;
205            if (mCurAnimator != null) {
206                mCurAnimator.start();
207            }
208            invalidateSelf();
209        }
210    }
211
212    private Animator makeVisibleAnimator() {
213        return makeAnimators(mInnerRadiusVisibleMax, mInnerRadiusVisibleMin,
214                ALPHA_VISIBLE_MAX, ALPHA_VISIBLE_MIN, VISIBLE_DURATION,
215                mAccelerateDecelerateInterpolator,
216                true /* repeating */, false /* stateUpdateListener */);
217    }
218
219    private Animator makeEnterAnimator(float radius, int alpha) {
220        return makeAnimators(radius, mInnerRadiusVisibleMax,
221                alpha, ALPHA_VISIBLE_MAX, ENTER_DURATION, mLinearOutSlowInInterpolator,
222                false /* repeating */, true /* stateUpdateListener */);
223    }
224
225    private Animator makeExitAnimator(float radius, int alpha) {
226        return makeAnimators(radius, mInnerRadiusExit,
227                alpha, 0, EXIT_DURATION, mFastOutSlowInInterpolator,
228                false /* repeating */, true /* stateUpdateListener */);
229    }
230
231    private Animator makeAnimators(float startRadius, float endRadius,
232            int startAlpha, int endAlpha, long duration, Interpolator interpolator,
233            boolean repeating, boolean stateUpdateListener) {
234        ValueAnimator alphaAnimator = configureAnimator(
235                ValueAnimator.ofInt(startAlpha, endAlpha),
236                duration, mAlphaUpdateListener, interpolator, repeating);
237        ValueAnimator sizeAnimator = configureAnimator(
238                ValueAnimator.ofFloat(startRadius, endRadius),
239                duration, mRadiusUpdateListener, interpolator, repeating);
240
241        AnimatorSet set = new AnimatorSet();
242        set.playTogether(alphaAnimator, sizeAnimator);
243        if (stateUpdateListener) {
244            set.addListener(new StateUpdateAnimatorListener());
245        }
246        return set;
247    }
248
249    private ValueAnimator configureAnimator(ValueAnimator animator, long duration,
250            ValueAnimator.AnimatorUpdateListener updateListener, Interpolator interpolator,
251            boolean repeating) {
252        animator.setDuration(duration);
253        animator.addUpdateListener(updateListener);
254        animator.setInterpolator(interpolator);
255        if (repeating) {
256            animator.setRepeatCount(ValueAnimator.INFINITE);
257            animator.setRepeatMode(ValueAnimator.REVERSE);
258        }
259        return animator;
260    }
261
262    private final ValueAnimator.AnimatorUpdateListener mAlphaUpdateListener =
263            new ValueAnimator.AnimatorUpdateListener() {
264        @Override
265        public void onAnimationUpdate(ValueAnimator animation) {
266            mCurAlpha = (int) animation.getAnimatedValue();
267            invalidateSelf();
268        }
269    };
270
271    private final ValueAnimator.AnimatorUpdateListener mRadiusUpdateListener =
272            new ValueAnimator.AnimatorUpdateListener() {
273        @Override
274        public void onAnimationUpdate(ValueAnimator animation) {
275            mCurInnerRadius = (float) animation.getAnimatedValue();
276            invalidateSelf();
277        }
278    };
279
280    private class StateUpdateAnimatorListener extends AnimatorListenerAdapter {
281        boolean mCancelled;
282
283        @Override
284        public void onAnimationStart(Animator animation) {
285            mCancelled = false;
286        }
287
288        @Override
289        public void onAnimationCancel(Animator animation) {
290            mCancelled = true;
291        }
292
293        @Override
294        public void onAnimationEnd(Animator animation) {
295            if (!mCancelled) {
296                updateState(false);
297            }
298        }
299    }
300}
301