/*
* Copyright 2014 Google Inc. All rights reserved.
*
* 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.google.samples.apps.iosched.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.support.annotation.DrawableRes;
import android.widget.ImageView;
import com.google.samples.apps.iosched.R;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.bumptech.glide.BitmapRequestBuilder;
import com.bumptech.glide.Glide;
import com.bumptech.glide.BitmapTypeRequest;
import com.bumptech.glide.load.model.GlideUrl;
import com.bumptech.glide.load.model.ModelCache;
import com.bumptech.glide.load.model.stream.BaseGlideUrlLoader;
import com.bumptech.glide.load.resource.bitmap.CenterCrop;
import com.bumptech.glide.request.RequestListener;
import static com.google.samples.apps.iosched.util.LogUtils.LOGW;
import static com.google.samples.apps.iosched.util.LogUtils.makeLogTag;
public class ImageLoader {
private static final String TAG = makeLogTag(ImageLoader.class);
private static final ModelCache<String, GlideUrl> urlCache =
new ModelCache<String, GlideUrl>(150);
private final BitmapTypeRequest<String> mGlideModelRequest;
private final CenterCrop mCenterCrop;
private int mPlaceHolderResId = -1;
/**
* Construct a standard ImageLoader object.
*/
public ImageLoader(Context context) {
VariableWidthImageLoader imageLoader = new VariableWidthImageLoader(context);
mGlideModelRequest = Glide.with(context).using(imageLoader).from(String.class).asBitmap();
mCenterCrop = new CenterCrop(Glide.get(context).getBitmapPool());
}
/**
* Construct an ImageLoader with a default placeholder drawable.
*/
public ImageLoader(Context context, int placeHolderResId) {
this(context);
mPlaceHolderResId = placeHolderResId;
}
/**
* Load an image from a url into an ImageView using the default placeholder
* drawable if available.
* @param url The web URL of an image.
* @param imageView The target ImageView to load the image into.
* @param requestListener A listener to monitor the request result.
*/
public void loadImage(String url, ImageView imageView, RequestListener<String, Bitmap> requestListener) {
loadImage(url, imageView, requestListener, null, false);
}
/**
* Load an image from a url into an ImageView using the given placeholder drawable.
*
* @param url The web URL of an image.
* @param imageView The target ImageView to load the image into.
* @param requestListener A listener to monitor the request result.
* @param placeholderOverride A placeholder to use in place of the default placholder.
*/
public void loadImage(String url, ImageView imageView, RequestListener<String, Bitmap> requestListener,
Drawable placeholderOverride) {
loadImage(url, imageView, requestListener, placeholderOverride, false /*crop*/);
}
/**
* Load an image from a url into an ImageView using the default placeholder
* drawable if available.
* @param url The web URL of an image.
* @param imageView The target ImageView to load the image into.
* @param requestListener A listener to monitor the request result.
* @param placeholderOverride A drawable to use as a placeholder for this specific image.
* If this parameter is present, {@link #mPlaceHolderResId}
* if ignored for this request.
*/
public void loadImage(String url, ImageView imageView, RequestListener<String, Bitmap> requestListener,
Drawable placeholderOverride, boolean crop) {
BitmapRequestBuilder request = beginImageLoad(url, requestListener, crop)
.animate(R.anim.image_fade_in);
if (placeholderOverride != null) {
request.placeholder(placeholderOverride);
} else if (mPlaceHolderResId != -1) {
request.placeholder(mPlaceHolderResId);
}
request.into(imageView);
}
public BitmapRequestBuilder beginImageLoad(String url,
RequestListener<String, Bitmap> requestListener, boolean crop) {
if (crop){
return mGlideModelRequest.load(url)
.listener(requestListener)
.transform(mCenterCrop);
} else {
return mGlideModelRequest.load(url)
.listener(requestListener);
}
}
/**
* Load an image from a url into the given image view using the default placeholder if
* available.
* @param url The web URL of an image.
* @param imageView The target ImageView to load the image into.
*/
public void loadImage(String url, ImageView imageView) {
loadImage(url, imageView, false /*crop*/);
}
/**
* Load an image from a url into an ImageView using the default placeholder
* drawable if available.
* @param url The web URL of an image.
* @param imageView The target ImageView to load the image into.
* @param crop True to apply a center crop to the image.
*/
public void loadImage(String url, ImageView imageView, boolean crop) {
loadImage(url, imageView, null, null, crop);
}
public void loadImage(Context context, @DrawableRes int drawableResId, ImageView imageView) {
Glide.with(context).load(drawableResId).into(imageView);
}
private static class VariableWidthImageLoader extends BaseGlideUrlLoader<String> {
private static final Pattern PATTERN = Pattern.compile("__w-((?:-?\\d+)+)__");
public VariableWidthImageLoader(Context context) {
super(context, urlCache);
}
/**
* If the URL contains a special variable width indicator (eg "__w-200-400-800__")
* we get the buckets from the URL (200, 400 and 800 in the example) and replace
* the URL with the best bucket for the requested width (the bucket immediately
* larger than the requested width).
*/
@Override
protected String getUrl(String model, int width, int height) {
Matcher m = PATTERN.matcher(model);
int bestBucket = 0;
if (m.find()) {
String[] found = m.group(1).split("-");
for (String bucketStr : found) {
bestBucket = Integer.parseInt(bucketStr);
if (bestBucket >= width) {
// the best bucket is the first immediately bigger than the requested width
break;
}
}
if (bestBucket > 0) {
model = m.replaceFirst("w"+bestBucket);
}
}
return model;
}
}
}