| /* |
| * Copyright (C) 2012 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.keyguard; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ValueAnimator; |
| import android.animation.ValueAnimator.AnimatorUpdateListener; |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Canvas; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.animation.DecelerateInterpolator; |
| import android.view.animation.Interpolator; |
| import android.view.animation.LinearInterpolator; |
| import android.widget.LinearLayout; |
| |
| /** |
| * A layout which animates a strip of horizontal, pulsing dots on request. This is used |
| * to indicate the presence of pages to the left / right. |
| */ |
| public class KeyguardGlowStripView extends LinearLayout { |
| private static final int DURATION = 500; |
| |
| private static final float SLIDING_WINDOW_SIZE = 0.4f; |
| private int mDotStripTop; |
| private int mHorizontalDotGap; |
| |
| private int mDotSize; |
| private int mNumDots; |
| private Drawable mDotDrawable; |
| private boolean mLeftToRight = true; |
| |
| private float mAnimationProgress = 0f; |
| private boolean mDrawDots = false; |
| private ValueAnimator mAnimator; |
| private Interpolator mDotAlphaInterpolator = new DecelerateInterpolator(0.5f); |
| |
| public KeyguardGlowStripView(Context context) { |
| this(context, null, 0); |
| } |
| |
| public KeyguardGlowStripView(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public KeyguardGlowStripView(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.KeyguardGlowStripView); |
| mDotSize = a.getDimensionPixelSize(R.styleable.KeyguardGlowStripView_dotSize, mDotSize); |
| mNumDots = a.getInt(R.styleable.KeyguardGlowStripView_numDots, mNumDots); |
| mDotDrawable = a.getDrawable(R.styleable.KeyguardGlowStripView_glowDot); |
| mLeftToRight = a.getBoolean(R.styleable.KeyguardGlowStripView_leftToRight, mLeftToRight); |
| } |
| |
| protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| int availableWidth = w - getPaddingLeft() - getPaddingRight(); |
| mHorizontalDotGap = (availableWidth - mDotSize * mNumDots) / (mNumDots - 1); |
| mDotStripTop = getPaddingTop(); |
| invalidate(); |
| } |
| |
| @Override |
| protected void dispatchDraw(Canvas canvas) { |
| super.dispatchDraw(canvas); |
| |
| if (!mDrawDots) return; |
| |
| int xOffset = getPaddingLeft(); |
| mDotDrawable.setBounds(0, 0, mDotSize, mDotSize); |
| |
| for (int i = 0; i < mNumDots; i++) { |
| // We fudge the relative position to provide a fade in of the first dot and a fade |
| // out of the final dot. |
| float relativeDotPosition = SLIDING_WINDOW_SIZE / 2 + ((1.0f * i) / (mNumDots - 1)) * |
| (1 - SLIDING_WINDOW_SIZE); |
| float distance = Math.abs(relativeDotPosition - mAnimationProgress); |
| float alpha = Math.max(0, 1 - distance / (SLIDING_WINDOW_SIZE / 2)); |
| |
| alpha = mDotAlphaInterpolator.getInterpolation(alpha); |
| |
| canvas.save(); |
| canvas.translate(xOffset, mDotStripTop); |
| mDotDrawable.setAlpha((int) (alpha * 255)); |
| mDotDrawable.draw(canvas); |
| canvas.restore(); |
| xOffset += mDotSize + mHorizontalDotGap; |
| } |
| } |
| |
| public void makeEmGo() { |
| if (mAnimator != null) { |
| mAnimator.cancel(); |
| } |
| float from = mLeftToRight ? 0f : 1f; |
| float to = mLeftToRight ? 1f : 0f; |
| mAnimator = ValueAnimator.ofFloat(from, to); |
| mAnimator.setDuration(DURATION); |
| mAnimator.setInterpolator(new LinearInterpolator()); |
| mAnimator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| mDrawDots = false; |
| // make sure we draw one frame at the end with everything gone. |
| invalidate(); |
| } |
| |
| @Override |
| public void onAnimationStart(Animator animation) { |
| mDrawDots = true; |
| } |
| }); |
| mAnimator.addUpdateListener(new AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| mAnimationProgress = (Float) animation.getAnimatedValue(); |
| invalidate(); |
| } |
| }); |
| mAnimator.start(); |
| } |
| } |