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| 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 | + */ |
| 16 | +package com.android.internal.policy.impl.keyguard; |
| 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 | + |
| 32 | +import com.android.internal.R; |
| 33 | + |
| 34 | +/** |
| 35 | + * A layout which animates a strip of horizontal, pulsing dots on request. This is used |
| 36 | + * to indicate the presence of pages to the left / right. |
| 37 | + */ |
| 38 | +public class KeyguardGlowStripView extends LinearLayout { |
| 39 | + private static final int DURATION = 500; |
| 40 | + |
| 41 | + private static final float SLIDING_WINDOW_SIZE = 0.4f; |
| 42 | + private int mDotStripTop; |
| 43 | + private int mHorizontalDotGap; |
| 44 | + |
| 45 | + private int mDotSize; |
| 46 | + private int mNumDots; |
| 47 | + private Drawable mDotDrawable; |
| 48 | + private boolean mLeftToRight = true; |
| 49 | + |
| 50 | + private float mAnimationProgress = 0f; |
| 51 | + private boolean mDrawDots = false; |
| 52 | + private ValueAnimator mAnimator; |
| 53 | + private Interpolator mDotAlphaInterpolator = new DecelerateInterpolator(0.5f); |
| 54 | + |
| 55 | + public KeyguardGlowStripView(Context context) { |
| 56 | + this(context, null, 0); |
| 57 | + } |
| 58 | + |
| 59 | + public KeyguardGlowStripView(Context context, AttributeSet attrs) { |
| 60 | + this(context, attrs, 0); |
| 61 | + } |
| 62 | + |
| 63 | + public KeyguardGlowStripView(Context context, AttributeSet attrs, int defStyle) { |
| 64 | + super(context, attrs, defStyle); |
| 65 | + |
| 66 | + TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyguardGlowStripView); |
| 67 | + mDotSize = a.getDimensionPixelSize(R.styleable.KeyguardGlowStripView_dotSize, mDotSize); |
| 68 | + mNumDots = a.getInt(R.styleable.KeyguardGlowStripView_numDots, mNumDots); |
| 69 | + mDotDrawable = a.getDrawable(R.styleable.KeyguardGlowStripView_glowDot); |
| 70 | + mLeftToRight = a.getBoolean(R.styleable.KeyguardGlowStripView_leftToRight, mLeftToRight); |
| 71 | + } |
| 72 | + |
| 73 | + protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| 74 | + int availableWidth = w - getPaddingLeft() - getPaddingRight(); |
| 75 | + mHorizontalDotGap = (availableWidth - mDotSize * mNumDots) / (mNumDots - 1); |
| 76 | + mDotStripTop = getPaddingTop(); |
| 77 | + invalidate(); |
| 78 | + } |
| 79 | + |
| 80 | + @Override |
| 81 | + protected void dispatchDraw(Canvas canvas) { |
| 82 | + super.dispatchDraw(canvas); |
| 83 | + |
| 84 | + if (!mDrawDots) return; |
| 85 | + |
| 86 | + int xOffset = getPaddingLeft(); |
| 87 | + mDotDrawable.setBounds(0, 0, mDotSize, mDotSize); |
| 88 | + |
| 89 | + for (int i = 0; i < mNumDots; i++) { |
| 90 | + // We fudge the relative position to provide a fade in of the first dot and a fade |
| 91 | + // out of the final dot. |
| 92 | + float relativeDotPosition = SLIDING_WINDOW_SIZE / 2 + ((1.0f * i) / (mNumDots - 1)) * |
| 93 | + (1 - SLIDING_WINDOW_SIZE); |
| 94 | + float distance = Math.abs(relativeDotPosition - mAnimationProgress); |
| 95 | + float alpha = Math.max(0, 1 - distance / (SLIDING_WINDOW_SIZE / 2)); |
| 96 | + |
| 97 | + alpha = mDotAlphaInterpolator.getInterpolation(alpha); |
| 98 | + |
| 99 | + canvas.save(); |
| 100 | + canvas.translate(xOffset, mDotStripTop); |
| 101 | + mDotDrawable.setAlpha((int) (alpha * 255)); |
| 102 | + mDotDrawable.draw(canvas); |
| 103 | + canvas.restore(); |
| 104 | + xOffset += mDotSize + mHorizontalDotGap; |
| 105 | + } |
| 106 | + } |
| 107 | + |
| 108 | + public void makeEmGo() { |
| 109 | + if (mAnimator != null) { |
| 110 | + mAnimator.cancel(); |
| 111 | + } |
| 112 | + float from = mLeftToRight ? 0f : 1f; |
| 113 | + float to = mLeftToRight ? 1f : 0f; |
| 114 | + mAnimator = ValueAnimator.ofFloat(from, to); |
| 115 | + mAnimator.setDuration(DURATION); |
| 116 | + mAnimator.setInterpolator(new LinearInterpolator()); |
| 117 | + mAnimator.addListener(new AnimatorListenerAdapter() { |
| 118 | + @Override |
| 119 | + public void onAnimationEnd(Animator animation) { |
| 120 | + mDrawDots = false; |
| 121 | + // make sure we draw one frame at the end with everything gone. |
| 122 | + invalidate(); |
| 123 | + } |
| 124 | + |
| 125 | + @Override |
| 126 | + public void onAnimationStart(Animator animation) { |
| 127 | + mDrawDots = true; |
| 128 | + } |
| 129 | + }); |
| 130 | + mAnimator.addUpdateListener(new AnimatorUpdateListener() { |
| 131 | + @Override |
| 132 | + public void onAnimationUpdate(ValueAnimator animation) { |
| 133 | + mAnimationProgress = (Float) animation.getAnimatedValue(); |
| 134 | + invalidate(); |
| 135 | + } |
| 136 | + }); |
| 137 | + mAnimator.start(); |
| 138 | + } |
| 139 | +} |
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