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/*
* Copyright (C) 2013 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.camera.ui;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
/**
* This class handles all the animations at capture time. Post capture animations
* will be handled in a separate place.
*/
public class CaptureAnimationOverlay extends View {
private final static String TAG = CaptureAnimationOverlay.class.getSimpleName();
private final static int FLASH_COLOR = Color.WHITE;
private static final float FLASH_MAX_ALPHA = 0.85f;
private static final long FLASH_FULL_DURATION_MS = 65;
private static final long FLASH_DECREASE_DURATION_MS = 150;
private static final float SHORT_FLASH_MAX_ALPHA = 0.75f;
private static final long SHORT_FLASH_FULL_DURATION_MS = 34;
private static final long SHORT_FLASH_DECREASE_DURATION_MS = 100;
private AnimatorSet mFlashAnimation;
private final RectF mPreviewArea = new RectF();
private final Paint mPaint = new Paint();
private final Interpolator mFlashAnimInterpolator;
private final ValueAnimator.AnimatorUpdateListener mFlashAnimUpdateListener;
private final Animator.AnimatorListener mFlashAnimListener;
public CaptureAnimationOverlay(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint.setColor(FLASH_COLOR);
mFlashAnimInterpolator = new LinearInterpolator();
mFlashAnimUpdateListener = new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float alpha = 255.0f * (Float) animation.getAnimatedValue();
mPaint.setAlpha((int) alpha);
invalidate();
}
};
mFlashAnimListener = new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
setVisibility(VISIBLE);
}
@Override
public void onAnimationEnd(Animator animation) {
mFlashAnimation = null;
setVisibility(GONE);
}
@Override
public void onAnimationCancel(Animator animation) {
// End is always called after cancel.
}
@Override
public void onAnimationRepeat(Animator animation) {
}
};
}
/**
* Start flash animation.
*
* @param shortFlash show shortest possible flash instead of regular long version.
*/
public void startFlashAnimation(boolean shortFlash) {
if (mFlashAnimation != null && mFlashAnimation.isRunning()) {
mFlashAnimation.cancel();
}
float maxAlpha;
if (shortFlash) {
maxAlpha = SHORT_FLASH_MAX_ALPHA;
} else {
maxAlpha = FLASH_MAX_ALPHA;
}
ValueAnimator flashAnim1 = ValueAnimator.ofFloat(maxAlpha, maxAlpha);
ValueAnimator flashAnim2 = ValueAnimator.ofFloat(maxAlpha, .0f);
if (shortFlash) {
flashAnim1.setDuration(SHORT_FLASH_FULL_DURATION_MS);
flashAnim2.setDuration(SHORT_FLASH_DECREASE_DURATION_MS);
} else {
flashAnim1.setDuration(FLASH_FULL_DURATION_MS);
flashAnim2.setDuration(FLASH_DECREASE_DURATION_MS);
}
flashAnim1.addUpdateListener(mFlashAnimUpdateListener);
flashAnim2.addUpdateListener(mFlashAnimUpdateListener);
flashAnim1.setInterpolator(mFlashAnimInterpolator);
flashAnim2.setInterpolator(mFlashAnimInterpolator);
mFlashAnimation = new AnimatorSet();
mFlashAnimation.play(flashAnim1).before(flashAnim2);
mFlashAnimation.addListener(mFlashAnimListener);
mFlashAnimation.start();
}
@Override
public void onDraw(Canvas canvas) {
if (mFlashAnimation != null && mFlashAnimation.isRunning()) {
// mPaint alpha is animated by the animation.
canvas.drawRect(mPreviewArea, mPaint);
canvas.clipRect(mPreviewArea);
}
}
@Override
public boolean hasOverlappingRendering() {
// The internal draw method will NOT have draw calls that overlap.
return false;
}
public void setPreviewRect(RectF previewArea) {
mPreviewArea.set(previewArea);
}
}
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