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/*
* Copyright (C) 2015 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.messaging.ui.photoviewer;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.support.rastermill.FrameSequenceDrawable;
import android.support.v4.content.AsyncTaskLoader;
import com.android.ex.photo.PhotoViewController;
import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface;
import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface.BitmapResult;
import com.android.messaging.datamodel.media.ImageRequestDescriptor;
import com.android.messaging.datamodel.media.ImageResource;
import com.android.messaging.datamodel.media.MediaRequest;
import com.android.messaging.datamodel.media.MediaResourceManager;
import com.android.messaging.datamodel.media.UriImageRequestDescriptor;
import com.android.messaging.util.ImageUtils;
/**
* Loader for the bitmap of a photo.
*/
public class BuglePhotoBitmapLoader extends AsyncTaskLoader<BitmapResult>
implements PhotoBitmapLoaderInterface {
private String mPhotoUri;
private ImageResource mImageResource;
// The drawable that is currently "in use" and being presented to the user. This drawable
// should never exist without the image resource backing it.
private Drawable mDrawable;
public BuglePhotoBitmapLoader(Context context, String photoUri) {
super(context);
mPhotoUri = photoUri;
}
@Override
public void setPhotoUri(String photoUri) {
mPhotoUri = photoUri;
}
@Override
public BitmapResult loadInBackground() {
final BitmapResult result = new BitmapResult();
final Context context = getContext();
if (context != null && mPhotoUri != null) {
final ImageRequestDescriptor descriptor =
new UriImageRequestDescriptor(Uri.parse(mPhotoUri),
PhotoViewController.sMaxPhotoSize, PhotoViewController.sMaxPhotoSize,
true /* allowCompression */, false /* isStatic */,
false /* cropToCircle */,
ImageUtils.DEFAULT_CIRCLE_BACKGROUND_COLOR /* circleBackgroundColor */,
ImageUtils.DEFAULT_CIRCLE_STROKE_COLOR /* circleStrokeColor */);
final MediaRequest<ImageResource> imageRequest =
descriptor.buildSyncMediaRequest(context);
final ImageResource imageResource =
MediaResourceManager.get().requestMediaResourceSync(imageRequest);
if (imageResource != null) {
setImageResource(imageResource);
result.status = BitmapResult.STATUS_SUCCESS;
result.drawable = mImageResource.getDrawable(context.getResources());
} else {
releaseImageResource();
result.status = BitmapResult.STATUS_EXCEPTION;
}
} else {
result.status = BitmapResult.STATUS_EXCEPTION;
}
return result;
}
/**
* Called when there is new data to deliver to the client. The super class will take care of
* delivering it; the implementation here just adds a little more logic.
*/
@Override
public void deliverResult(BitmapResult result) {
final Drawable drawable = result != null ? result.drawable : null;
if (isReset()) {
// An async query came in while the loader is stopped. We don't need the result.
releaseDrawable(drawable);
return;
}
// We are now going to display this drawable so set to mDrawable
mDrawable = drawable;
if (isStarted()) {
// If the Loader is currently started, we can immediately deliver its results.
super.deliverResult(result);
}
}
/**
* Handles a request to start the Loader.
*/
@Override
protected void onStartLoading() {
if (mDrawable != null) {
// If we currently have a result available, deliver it
// immediately.
final BitmapResult result = new BitmapResult();
result.status = BitmapResult.STATUS_SUCCESS;
result.drawable = mDrawable;
deliverResult(result);
}
if (takeContentChanged() || (mImageResource == null)) {
// If the data has changed since the last time it was loaded
// or is not currently available, start a load.
forceLoad();
}
}
/**
* Handles a request to stop the Loader.
*/
@Override
protected void onStopLoading() {
// Attempt to cancel the current load task if possible.
cancelLoad();
}
/**
* Handles a request to cancel a load.
*/
@Override
public void onCanceled(BitmapResult result) {
super.onCanceled(result);
// At this point we can release the resources associated with 'drawable' if needed.
if (result != null) {
releaseDrawable(result.drawable);
}
}
/**
* Handles a request to completely reset the Loader.
*/
@Override
protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
releaseImageResource();
}
private void releaseDrawable(Drawable drawable) {
if (drawable != null && drawable instanceof FrameSequenceDrawable
&& !((FrameSequenceDrawable) drawable).isDestroyed()) {
((FrameSequenceDrawable) drawable).destroy();
}
}
private void setImageResource(final ImageResource resource) {
if (mImageResource != resource) {
// Clear out any information for what is currently used
releaseImageResource();
mImageResource = resource;
// No need to add ref since a ref is already reserved as a result of
// requestMediaResourceSync.
}
}
private void releaseImageResource() {
// If we are getting rid of the imageResource backing the drawable, we must also
// destroy the drawable before releasing it.
releaseDrawable(mDrawable);
mDrawable = null;
if (mImageResource != null) {
mImageResource.release();
}
mImageResource = null;
}
}
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