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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.dreams.phototable;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.service.dreams.Dream;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewPropertyAnimator;
import android.widget.FrameLayout;
import android.widget.ImageView;
import java.util.HashMap;
/**
* A FrameLayout that holds two photos, back to back.
*/
public class PhotoCarousel extends FrameLayout {
private static final String TAG = "PhotoCarousel";
private final Flipper mFlipper;
private final PhotoSourcePlexor mPhotoSource;
private final GestureDetector mGestureDetector;
private final View[] mPanel;
private final BitmapFactory.Options mOptions;
private final int mFlipDuration;
private final int mDropPeriod;
private boolean mOnce;
private int mLongSide;
private int mShortSide;
private final HashMap<View, Bitmap> mBitmapStore;
class Flipper implements Runnable {
@Override
public void run() {
PhotoCarousel.this.flip(1f);
}
}
public PhotoCarousel(Context context, AttributeSet as) {
super(context, as);
final Resources resources = getResources();
mDropPeriod = resources.getInteger(R.integer.drop_period);
mFlipDuration = resources.getInteger(R.integer.flip_duration);
mOptions = new BitmapFactory.Options();
mOptions.inTempStorage = new byte[32768];
mPhotoSource = new PhotoSourcePlexor(getContext(),
getContext().getSharedPreferences(FlipperDreamSettings.PREFS_NAME, 0));
mBitmapStore = new HashMap<View, Bitmap>();
mPanel = new View[2];
mFlipper = new Flipper();
mGestureDetector = new GestureDetector(context,
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float vX, float vY) {
Log.i(TAG, "fling with " + vX);
flip(Math.signum(vX));
return true;
}
});
}
private float lockTo180(float a) {
return 180f * (float) Math.floor(a / 180f);
}
private float wrap360(float a) {
return a - 360f * (float) Math.floor(a / 360f);
}
private class PhotoLoadTask extends AsyncTask<Void, Void, Bitmap> {
private ImageView mDestination;
public PhotoLoadTask(View destination) {
mDestination = (ImageView) destination;
}
@Override
public Bitmap doInBackground(Void... unused) {
Bitmap decodedPhoto = mPhotoSource.next(PhotoCarousel.this.mOptions,
PhotoCarousel.this.mLongSide, PhotoCarousel.this.mShortSide);
return decodedPhoto;
}
@Override
public void onPostExecute(Bitmap photo) {
if (photo != null) {
Bitmap old = mBitmapStore.get(mDestination);
mDestination.setImageBitmap(photo);
mBitmapStore.put(mDestination, photo);
if (old != null) {
old.recycle();
}
PhotoCarousel.this.requestLayout();
} else {
postDelayed(new Runnable() {
@Override
public void run() {
new PhotoLoadTask(mDestination)
.execute();
}
}, 100);
}
}
};
public void flip(float sgn) {
mPanel[0].animate().cancel();
mPanel[1].animate().cancel();
float frontY = mPanel[0].getRotationY();
float backY = mPanel[1].getRotationY();
frontY = wrap360(frontY);
backY = wrap360(backY);
mPanel[0].setRotationY(frontY);
mPanel[1].setRotationY(backY);
frontY = lockTo180(frontY + sgn * 180f);
backY = lockTo180(backY + sgn * 180f);
float frontA = 1f;
float backA = 0f;
if (frontY == 180f || frontY == -180f) {
frontA = 0f;
backA = 1f;
} else {
frontA = 1f;
backA = 0f;
}
ViewPropertyAnimator frontAnim = mPanel[0].animate()
.rotationY(frontY)
.alpha(frontA)
.setDuration(mFlipDuration);
ViewPropertyAnimator backAnim = mPanel[1].animate()
.rotationY(backY)
.alpha(backA)
.setDuration(mFlipDuration);
int replaceIdx = 1;
ViewPropertyAnimator replaceAnim = backAnim;
if (frontA == 0f) {
replaceAnim = frontAnim;
replaceIdx = 0;
}
final View replaceView = mPanel[replaceIdx];
replaceAnim.withEndAction(new Runnable() {
@Override
public void run() {
new PhotoLoadTask(replaceView)
.execute();
}
});
frontAnim.start();
backAnim.start();
scheduleNext(mDropPeriod);
}
@Override
public void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
int height = bottom - top;
int width = right - left;
mLongSide = (int) Math.max(width, height);
mShortSide = (int) Math.min(width, height);
if (!mOnce) {
mOnce = true;
mPanel[0] = findViewById(R.id.front);
mPanel[1] = findViewById(R.id.back);
new PhotoLoadTask(mPanel[0]).execute();
new PhotoLoadTask(mPanel[1]).execute();
scheduleNext(mDropPeriod);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mGestureDetector.onTouchEvent(event);
return true;
}
public void scheduleNext(int delay) {
removeCallbacks(mFlipper);
postDelayed(mFlipper, delay);
}
}
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