| /* |
| * Copyright (C) 2014 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.systemui; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ValueAnimator; |
| import android.graphics.ColorMatrix; |
| import android.graphics.ColorMatrixColorFilter; |
| import android.graphics.Paint; |
| import android.view.View; |
| import android.view.animation.AnimationUtils; |
| import android.view.animation.Interpolator; |
| |
| /** |
| * Helper to invert the colors of views and fade between the states. |
| */ |
| public class ViewInvertHelper { |
| |
| private final Paint mDarkPaint = new Paint(); |
| private final Interpolator mLinearOutSlowInInterpolator; |
| private final View mTarget; |
| private final ColorMatrix mMatrix = new ColorMatrix(); |
| private final ColorMatrix mGrayscaleMatrix = new ColorMatrix(); |
| private final long mFadeDuration; |
| |
| public ViewInvertHelper(View target, long fadeDuration) { |
| mTarget = target; |
| mLinearOutSlowInInterpolator = AnimationUtils.loadInterpolator(mTarget.getContext(), |
| android.R.interpolator.linear_out_slow_in); |
| mFadeDuration = fadeDuration; |
| } |
| |
| public void fade(final boolean invert, long delay) { |
| float startIntensity = invert ? 0f : 1f; |
| float endIntensity = invert ? 1f : 0f; |
| ValueAnimator animator = ValueAnimator.ofFloat(startIntensity, endIntensity); |
| animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| updateInvertPaint((Float) animation.getAnimatedValue()); |
| mTarget.setLayerType(View.LAYER_TYPE_HARDWARE, mDarkPaint); |
| } |
| }); |
| animator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (!invert) { |
| mTarget.setLayerType(View.LAYER_TYPE_NONE, null); |
| } |
| } |
| }); |
| animator.setDuration(mFadeDuration); |
| animator.setInterpolator(mLinearOutSlowInInterpolator); |
| animator.setStartDelay(delay); |
| animator.start(); |
| } |
| |
| public void update(boolean invert) { |
| if (invert) { |
| updateInvertPaint(1f); |
| mTarget.setLayerType(View.LAYER_TYPE_HARDWARE, mDarkPaint); |
| } else { |
| mTarget.setLayerType(View.LAYER_TYPE_NONE, null); |
| } |
| } |
| |
| public View getTarget() { |
| return mTarget; |
| } |
| |
| private void updateInvertPaint(float intensity) { |
| float components = 1 - 2 * intensity; |
| final float[] invert = { |
| components, 0f, 0f, 0f, 255f * intensity, |
| 0f, components, 0f, 0f, 255f * intensity, |
| 0f, 0f, components, 0f, 255f * intensity, |
| 0f, 0f, 0f, 1f, 0f |
| }; |
| mMatrix.set(invert); |
| mGrayscaleMatrix.setSaturation(1 - intensity); |
| mMatrix.preConcat(mGrayscaleMatrix); |
| mDarkPaint.setColorFilter(new ColorMatrixColorFilter(mMatrix)); |
| } |
| } |