Jim Miller | c1aa6a5 | 2012-09-28 19:37:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | */ |
Jim Miller | 5ecd811 | 2013-01-09 18:50:26 -0800 | [diff] [blame] | 16 | package com.android.keyguard; |
Jim Miller | c1aa6a5 | 2012-09-28 19:37:26 -0700 | [diff] [blame] | 17 | |
| 18 | import android.animation.Animator; |
| 19 | import android.animation.AnimatorListenerAdapter; |
| 20 | import android.animation.ValueAnimator; |
| 21 | import android.animation.ValueAnimator.AnimatorUpdateListener; |
| 22 | import android.content.Context; |
| 23 | import android.content.res.TypedArray; |
| 24 | import android.graphics.Canvas; |
| 25 | import android.graphics.drawable.Drawable; |
| 26 | import android.util.AttributeSet; |
| 27 | import android.view.animation.DecelerateInterpolator; |
| 28 | import android.view.animation.Interpolator; |
| 29 | import android.view.animation.LinearInterpolator; |
| 30 | import android.widget.LinearLayout; |
| 31 | |
Jim Miller | c1aa6a5 | 2012-09-28 19:37:26 -0700 | [diff] [blame] | 32 | /** |
| 33 | * A layout which animates a strip of horizontal, pulsing dots on request. This is used |
| 34 | * to indicate the presence of pages to the left / right. |
| 35 | */ |
| 36 | public class KeyguardGlowStripView extends LinearLayout { |
| 37 | private static final int DURATION = 500; |
| 38 | |
| 39 | private static final float SLIDING_WINDOW_SIZE = 0.4f; |
| 40 | private int mDotStripTop; |
| 41 | private int mHorizontalDotGap; |
| 42 | |
| 43 | private int mDotSize; |
| 44 | private int mNumDots; |
| 45 | private Drawable mDotDrawable; |
| 46 | private boolean mLeftToRight = true; |
| 47 | |
| 48 | private float mAnimationProgress = 0f; |
| 49 | private boolean mDrawDots = false; |
| 50 | private ValueAnimator mAnimator; |
| 51 | private Interpolator mDotAlphaInterpolator = new DecelerateInterpolator(0.5f); |
| 52 | |
| 53 | public KeyguardGlowStripView(Context context) { |
| 54 | this(context, null, 0); |
| 55 | } |
| 56 | |
| 57 | public KeyguardGlowStripView(Context context, AttributeSet attrs) { |
| 58 | this(context, attrs, 0); |
| 59 | } |
| 60 | |
| 61 | public KeyguardGlowStripView(Context context, AttributeSet attrs, int defStyle) { |
| 62 | super(context, attrs, defStyle); |
| 63 | |
| 64 | TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyguardGlowStripView); |
| 65 | mDotSize = a.getDimensionPixelSize(R.styleable.KeyguardGlowStripView_dotSize, mDotSize); |
| 66 | mNumDots = a.getInt(R.styleable.KeyguardGlowStripView_numDots, mNumDots); |
| 67 | mDotDrawable = a.getDrawable(R.styleable.KeyguardGlowStripView_glowDot); |
| 68 | mLeftToRight = a.getBoolean(R.styleable.KeyguardGlowStripView_leftToRight, mLeftToRight); |
| 69 | } |
| 70 | |
| 71 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| 72 | int availableWidth = w - getPaddingLeft() - getPaddingRight(); |
| 73 | mHorizontalDotGap = (availableWidth - mDotSize * mNumDots) / (mNumDots - 1); |
| 74 | mDotStripTop = getPaddingTop(); |
| 75 | invalidate(); |
| 76 | } |
| 77 | |
| 78 | @Override |
| 79 | protected void dispatchDraw(Canvas canvas) { |
| 80 | super.dispatchDraw(canvas); |
| 81 | |
| 82 | if (!mDrawDots) return; |
| 83 | |
| 84 | int xOffset = getPaddingLeft(); |
| 85 | mDotDrawable.setBounds(0, 0, mDotSize, mDotSize); |
| 86 | |
| 87 | for (int i = 0; i < mNumDots; i++) { |
| 88 | // We fudge the relative position to provide a fade in of the first dot and a fade |
| 89 | // out of the final dot. |
| 90 | float relativeDotPosition = SLIDING_WINDOW_SIZE / 2 + ((1.0f * i) / (mNumDots - 1)) * |
| 91 | (1 - SLIDING_WINDOW_SIZE); |
| 92 | float distance = Math.abs(relativeDotPosition - mAnimationProgress); |
| 93 | float alpha = Math.max(0, 1 - distance / (SLIDING_WINDOW_SIZE / 2)); |
| 94 | |
| 95 | alpha = mDotAlphaInterpolator.getInterpolation(alpha); |
| 96 | |
| 97 | canvas.save(); |
| 98 | canvas.translate(xOffset, mDotStripTop); |
| 99 | mDotDrawable.setAlpha((int) (alpha * 255)); |
| 100 | mDotDrawable.draw(canvas); |
| 101 | canvas.restore(); |
| 102 | xOffset += mDotSize + mHorizontalDotGap; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | public void makeEmGo() { |
| 107 | if (mAnimator != null) { |
| 108 | mAnimator.cancel(); |
| 109 | } |
| 110 | float from = mLeftToRight ? 0f : 1f; |
| 111 | float to = mLeftToRight ? 1f : 0f; |
| 112 | mAnimator = ValueAnimator.ofFloat(from, to); |
| 113 | mAnimator.setDuration(DURATION); |
| 114 | mAnimator.setInterpolator(new LinearInterpolator()); |
| 115 | mAnimator.addListener(new AnimatorListenerAdapter() { |
| 116 | @Override |
| 117 | public void onAnimationEnd(Animator animation) { |
| 118 | mDrawDots = false; |
| 119 | // make sure we draw one frame at the end with everything gone. |
| 120 | invalidate(); |
| 121 | } |
| 122 | |
| 123 | @Override |
| 124 | public void onAnimationStart(Animator animation) { |
| 125 | mDrawDots = true; |
| 126 | } |
| 127 | }); |
| 128 | mAnimator.addUpdateListener(new AnimatorUpdateListener() { |
| 129 | @Override |
| 130 | public void onAnimationUpdate(ValueAnimator animation) { |
| 131 | mAnimationProgress = (Float) animation.getAnimatedValue(); |
| 132 | invalidate(); |
| 133 | } |
| 134 | }); |
| 135 | mAnimator.start(); |
| 136 | } |
| 137 | } |