1 /* 2 * Copyright (C) 2015 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 17 package com.android.systemui.assist; 18 19 import android.animation.Animator; 20 import android.animation.AnimatorListenerAdapter; 21 import android.animation.AnimatorSet; 22 import android.animation.ValueAnimator; 23 import android.content.Context; 24 import android.graphics.Canvas; 25 import android.graphics.Color; 26 import android.graphics.Paint; 27 import android.graphics.PixelFormat; 28 import android.graphics.PorterDuff; 29 import android.graphics.PorterDuffXfermode; 30 import android.os.Handler; 31 import android.view.View; 32 import android.view.WindowManager; 33 import android.view.accessibility.AccessibilityEvent; 34 import android.view.animation.AnimationUtils; 35 36 import com.android.systemui.Interpolators; 37 import com.android.systemui.R; 38 39 /** 40 * Visually discloses that contextual data was provided to an assistant. 41 */ 42 public class AssistDisclosure { 43 private final Context mContext; 44 private final WindowManager mWm; 45 private final Handler mHandler; 46 47 private AssistDisclosureView mView; 48 private boolean mViewAdded; 49 50 public AssistDisclosure(Context context, Handler handler) { 51 mContext = context; 52 mHandler = handler; 53 mWm = mContext.getSystemService(WindowManager.class); 54 } 55 56 public void postShow() { 57 mHandler.removeCallbacks(mShowRunnable); 58 mHandler.post(mShowRunnable); 59 } 60 61 private void show() { 62 if (mView == null) { 63 mView = new AssistDisclosureView(mContext); 64 } 65 if (!mViewAdded) { 66 WindowManager.LayoutParams lp = new WindowManager.LayoutParams( 67 WindowManager.LayoutParams.TYPE_SECURE_SYSTEM_OVERLAY, 68 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 69 | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN 70 | WindowManager.LayoutParams.FLAG_FULLSCREEN 71 | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED, 72 PixelFormat.TRANSLUCENT); 73 lp.setTitle("AssistDisclosure"); 74 75 mWm.addView(mView, lp); 76 mViewAdded = true; 77 } 78 } 79 80 private void hide() { 81 if (mViewAdded) { 82 mWm.removeView(mView); 83 mViewAdded = false; 84 } 85 } 86 87 private Runnable mShowRunnable = new Runnable() { 88 @Override 89 public void run() { 90 show(); 91 } 92 }; 93 94 private class AssistDisclosureView extends View 95 implements ValueAnimator.AnimatorUpdateListener { 96 97 static final int FULL_ALPHA = 222; // 87% 98 static final int ALPHA_IN_ANIMATION_DURATION = 400; 99 static final int ALPHA_OUT_ANIMATION_DURATION = 300; 100 101 102 private float mThickness; 103 private float mShadowThickness; 104 private final Paint mPaint = new Paint(); 105 private final Paint mShadowPaint = new Paint(); 106 107 private final ValueAnimator mAlphaOutAnimator; 108 private final ValueAnimator mAlphaInAnimator; 109 private final AnimatorSet mAnimator; 110 111 private int mAlpha = 0; 112 113 public AssistDisclosureView(Context context) { 114 super(context); 115 116 mAlphaInAnimator = ValueAnimator.ofInt(0, FULL_ALPHA) 117 .setDuration(ALPHA_IN_ANIMATION_DURATION); 118 mAlphaInAnimator.addUpdateListener(this); 119 mAlphaInAnimator.setInterpolator(Interpolators.CUSTOM_40_40); 120 mAlphaOutAnimator = ValueAnimator.ofInt(FULL_ALPHA, 0).setDuration( 121 ALPHA_OUT_ANIMATION_DURATION); 122 mAlphaOutAnimator.addUpdateListener(this); 123 mAlphaOutAnimator.setInterpolator(Interpolators.CUSTOM_40_40); 124 mAnimator = new AnimatorSet(); 125 mAnimator.play(mAlphaInAnimator).before(mAlphaOutAnimator); 126 mAnimator.addListener(new AnimatorListenerAdapter() { 127 boolean mCancelled; 128 129 @Override 130 public void onAnimationStart(Animator animation) { 131 mCancelled = false; 132 } 133 134 @Override 135 public void onAnimationCancel(Animator animation) { 136 mCancelled = true; 137 } 138 139 @Override 140 public void onAnimationEnd(Animator animation) { 141 if (!mCancelled) { 142 hide(); 143 } 144 } 145 }); 146 147 PorterDuffXfermode srcMode = new PorterDuffXfermode(PorterDuff.Mode.SRC); 148 mPaint.setColor(Color.WHITE); 149 mPaint.setXfermode(srcMode); 150 mShadowPaint.setColor(Color.DKGRAY); 151 mShadowPaint.setXfermode(srcMode); 152 153 mThickness = getResources().getDimension(R.dimen.assist_disclosure_thickness); 154 mShadowThickness = getResources().getDimension( 155 R.dimen.assist_disclosure_shadow_thickness); 156 } 157 158 @Override 159 protected void onAttachedToWindow() { 160 super.onAttachedToWindow(); 161 162 startAnimation(); 163 sendAccessibilityEvent(AccessibilityEvent.TYPE_ASSIST_READING_CONTEXT); 164 } 165 166 @Override 167 protected void onDetachedFromWindow() { 168 super.onDetachedFromWindow(); 169 170 mAnimator.cancel(); 171 mAlpha = 0; 172 } 173 174 private void startAnimation() { 175 mAnimator.cancel(); 176 mAnimator.start(); 177 } 178 179 @Override 180 protected void onDraw(Canvas canvas) { 181 mPaint.setAlpha(mAlpha); 182 mShadowPaint.setAlpha(mAlpha / 4); 183 184 drawGeometry(canvas, mShadowPaint, mShadowThickness); 185 drawGeometry(canvas, mPaint, 0); 186 } 187 188 private void drawGeometry(Canvas canvas, Paint paint, float padding) { 189 final int width = getWidth(); 190 final int height = getHeight(); 191 float thickness = mThickness; 192 193 // bottom 194 drawBeam(canvas, 195 0, 196 height - thickness, 197 width, 198 height, paint, padding); 199 200 // sides 201 drawBeam(canvas, 202 0, 203 0, 204 thickness, 205 height - thickness, paint, padding); 206 drawBeam(canvas, 207 width - thickness, 208 0, 209 width, 210 height - thickness, paint, padding); 211 212 // top 213 drawBeam(canvas, 214 thickness, 215 0, 216 width - thickness, 217 thickness, paint, padding); 218 } 219 220 private void drawBeam(Canvas canvas, float left, float top, float right, float bottom, 221 Paint paint, float padding) { 222 canvas.drawRect(left - padding, 223 top - padding, 224 right + padding, 225 bottom + padding, 226 paint); 227 } 228 229 @Override 230 public void onAnimationUpdate(ValueAnimator animation) { 231 if (animation == mAlphaOutAnimator) { 232 mAlpha = (int) mAlphaOutAnimator.getAnimatedValue(); 233 } else if (animation == mAlphaInAnimator) { 234 mAlpha = (int) mAlphaInAnimator.getAnimatedValue(); 235 } 236 invalidate(); 237 } 238 } 239 } 240