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/*
* 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();
}
}
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