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https://github.com/alibaba/power_image
A powerful plugin that fully uses the native image library's ability to display images on the flutter side.
https://github.com/alibaba/power_image
flutter image
Last synced: about 2 months ago
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A powerful plugin that fully uses the native image library's ability to display images on the flutter side.
- Host: GitHub
- URL: https://github.com/alibaba/power_image
- Owner: alibaba
- License: mit
- Created: 2022-05-18T07:47:34.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-10-16T10:36:22.000Z (about 1 year ago)
- Last Synced: 2024-08-23T23:11:04.107Z (4 months ago)
- Topics: flutter, image
- Language: Dart
- Homepage:
- Size: 2.45 MB
- Stars: 507
- Watchers: 12
- Forks: 57
- Open Issues: 25
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
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README
# PowerImage
A powerful plugin that fully uses the native image library's ability to display images on the flutter side.
[中文文档](https://github.com/alibaba/power_image/blob/main/README_CN.md)
**Features:**
- Supports the ability to load ui.Image. In the solution based on external texture, the user could not get the real ui.Image to use, which made the image library powerless in this special usage scenario.
- Support image preloading capability. Just like flutter precacheImage. This is very useful in some scenarios that require high image display speed.
- Added texture cache to connect with flutter's imageCache! Unified image cache to avoid memory problems caused by mixing native images.
- Emulators are supported. Before flutter-1.23.0-18.1.pre, the emulator could not display Texture Widget.
- Improve the custom image type channel. Solve the demand for business custom image acquisition.
- Perfect exception capture and collection.
- Support animation. (PR from LiteTao)
# Usage
## Installation
- power_image：It is recommended to use the latest version, [power_image pub versions](https://pub.dev/packages/power_image/versions)
- power_image_ext：You need to choose the version based on the flutter version you are using. Go to [power_image_ext](https://github.com/alibaba/power_image_ext) for details！[power_image_ext pub versions](https://pub.dev/packages/power_image_ext/versions)
Add the following to your `pubspec.yaml` file:
```yaml
dependencies:
power_image: 0.1.0-pre.2
dependency_overrides:
power_image_ext: 2.5.3
```
or use code in github directly:
```yaml
dependencies:
power_image:
git:
url: '[email protected]:alibaba/power_image.git'
ref: '0.1.0-pre.2'
dependency_overrides:
power_image_ext:
git:
url: '[email protected]:alibaba/power_image_ext.git'
ref: '2.5.3'
```
## Setup
### Flutter
#### 1. Replace `ImageCache` with `ImageCacheExt`.
```dart
/// call before runApp()
PowerImageBinding();
```
or
```dart
/// return ImageCacheExt in createImageCache(),
/// if you have extends with WidgetsFlutterBinding
class XXX extends WidgetsFlutterBinding {
@override
ImageCache createImageCache() {
return ImageCacheExt();
}
}
```
#### 2. Setup PowerImageLoader
Initialize and set the global default rendering mode, renderingTypeTexture is texture mode, renderingTypeExternal is ffi mode
In addition, there are exception reports in PowerImageSetupOptions, and the sampling rate of exception reports can be set.
```dart
PowerImageLoader.instance.setup(PowerImageSetupOptions(renderingTypeTexture,
errorCallbackSamplingRate: 1.0,
errorCallback: (PowerImageLoadException exception) {
}));
```
### iOS
PowerImage provides basic image types, including network, file, nativeAsset, and flutter assets. Users need to customize their corresponding loaders.
#### OC
```objectivec
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageNetworkImageLoader new] forType:kPowerImageImageTypeNetwork];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageAssetsImageLoader new] forType:kPowerImageImageTypeNativeAsset];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageFlutterAssertImageLoader new] forType:kPowerImageImageTypeAsset];
[[PowerImageLoader sharedInstance] registerImageLoader:[PowerImageFileImageLoader new] forType:kPowerImageImageTypeFile];
```
#### Swift
```swift
PowerImageLoader.sharedInstance().register(PowerImageNetworkImageLoader.init(), forType: kPowerImageImageTypeNetwork)
PowerImageLoader.sharedInstance().register(PowerImageAssetsImageLoader.init(), forType: kPowerImageImageTypeNativeAsset)
PowerImageLoader.sharedInstance().register(PowerImageFlutterAssertImageLoader.init(), forType: kPowerImageImageTypeAsset)
PowerImageLoader.sharedInstance().register(PowerImageFileImageLoader.init(), forType: kPowerImageImageTypeFile)
```
The loader needs to follow the PowerImageLoaderProtocol protocol:
```objectivec
typedef void(^PowerImageLoaderCompletionBlock)(BOOL success, PowerImageResult *imageResult);
@protocol PowerImageLoaderProtocol
@required
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock;
@end
```
Network image loader example:
#### OC
```objectivec
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
/// CDN optimization, you need transfer reqSize to native image loader!
/// CDN optimization, you need transfer reqSize to native image loader!
/// like this: [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:requestConfig.srcString] viewSize:reqSize completed:
CGSize reqSize = requestConfig.originSize;
/// attention.
[[SDWebImageManager sharedManager] loadImageWithURL:[NSURL URLWithString:requestConfig.srcString] options:nil progress:^(NSInteger receivedSize, NSInteger expectedSize, NSURL * _Nullable targetURL) {
} completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, SDImageCacheType cacheType, BOOL finished, NSURL * _Nullable imageURL) {
if (image != nil) {
completedBlock([PowerImageResult successWithImage:image]);
}else {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}
}];
}
```
#### Swift
```swift
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let reqSize:CGSize = requestConfig.originSize
let url = URL(string: requestConfig.srcString())
SDWebImageManager.shared.loadImage(with: url, progress: nil) { image, data, error, cacheType, finished, url in
if let image = image {
if (image.sd_isAnimated) {
let frames:[SDImageFrame] = SDImageCoderHelper.frames(from: image)!
if frames.count > 0 {
var arr:[PowerImageFrame] = []
for index in 0.. 1; --screenScale) {
NSString *key = [self lookupKeyForAsset:[NSString stringWithFormat:@"%@/%d.0x/%@", path, screenScale, filename] fromPackage:package];
UIImage *image = [UIImage imageNamed:key inBundle:[NSBundle mainBundle] compatibleWithTraitCollection:nil];
if (image) {
return image;
}
}
NSString *key = [self lookupKeyForAsset:name fromPackage:package];
/// webp iOS < 14 not support
if ([name hasSuffix:@".webp"] && !(@available(ios 14.0, *))) {
NSString *mPath = [[NSBundle mainBundle] pathForResource:key ofType:nil];
NSData *webpData = [NSData dataWithContentsOfFile:mPath];
return [UIImage sd_imageWithWebPData:webpData];
}
return [UIImage imageNamed:key inBundle:[NSBundle mainBundle] compatibleWithTraitCollection:nil];
}
- (NSString *)lookupKeyForAsset:(NSString *)asset fromPackage:(NSString *)package {
if (package && [package isKindOfClass:[NSString class]] && ![package isEqualToString:@""]) {
return [FlutterDartProject lookupKeyForAsset:asset fromPackage:package];
}else {
return [FlutterDartProject lookupKeyForAsset:asset];
}
}
```
#### Swift
```swift
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let image = self.flutterImage(requestConfig: requestConfig)
if let image = image {
completedBlock(PowerImageResult.success(with: image))
}else {
completedBlock(PowerImageResult.fail(withMessage: "PowerImageFlutterAssertImageLoaderError"))
}
}
private func flutterImage(requestConfig:PowerImageRequestConfig) -> UIImage? {
let name:String = requestConfig.srcString()!
let package:String? = requestConfig.src["package"] as? String
let fileName:String = NSString(string: name).lastPathComponent
let path:String = NSString(string: name).deletingLastPathComponent
let scaleArr:[Int] = (2...Int(UIScreen.main.scale)).reversed()
for scale in scaleArr {
let key:String = self.lookupKeyForAsset(asset: String(format: "%s/%d.0x/%s", path,scale,fileName), package: package)
let image = UIImage(named: key,in: Bundle.main,compatibleWith: nil)
if image != nil {
return image!
}
}
let key = self.lookupKeyForAsset(asset: name, package: package)
return UIImage(named: key,in: Bundle.main,compatibleWith: nil)
}
private func lookupKeyForAsset(asset:String,package:String?) -> String {
if let package = package, package != "" {
return FlutterDartProject.lookupKey(forAsset: asset,fromPackage: package)
}else{
return FlutterDartProject.lookupKey(forAsset: asset)
}
}
```
file loader example:
#### OC
```objectivec
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
UIImage *image = [[UIImage alloc] initWithContentsOfFile:requestConfig.srcString];
if (image) {
completedBlock([PowerImageResult successWithImage:image]);
} else {
completedBlock([PowerImageResult failWithMessage:@"UIImage initWithContentsOfFile nil"]);
}
}
```
#### Swift
```swift
func handleRequest(_ requestConfig: PowerImageRequestConfig!, completed completedBlock: PowerImageLoaderCompletionBlock!) {
let image = UIImage(contentsOfFile: requestConfig.srcString())
if let image = image {
completedBlock(PowerImageResult.success(with: image))
}else{
completedBlock(PowerImageResult.fail(withMessage: "PowerImageFileImageLoaderError!"))
}
}
```
### Android
PowerImage provides basic image types, including network, file, nativeAsset, and flutter assets. Users need to customize their corresponding loaders.
#### Java
```java
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageNetworkLoader(this.getApplicationContext()), "network");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageNativeAssetLoader(this.getApplicationContext()), "nativeAsset");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageFlutterAssetLoader(this.getApplicationContext()), "asset");
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageFileLoader(this.getApplicationContext()), "file");
```
#### Kotlin
```kotlin
PowerImageLoader.getInstance().registerImageLoader(
PowerImageNetworkLoader(this.applicationContext), "network"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageNativeAssetLoader(this.applicationContext), "nativeAsset"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageFlutterAssetLoader(this.applicationContext), "asset"
)
PowerImageLoader.getInstance().registerImageLoader(
PowerImageFileLoader(this.applicationContext), "file"
)
```
The loader needs to follow the PowerImageLoaderProtocol protocol:
```java
public interface PowerImageLoaderProtocol {
void handleRequest(PowerImageRequestConfig request, PowerImageResult result);
}
```
Network image loader example:
#### Java
```java
public class PowerImageNetworkLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageNetworkLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
Glide.with(context).asDrawable().load(request.srcString()).listener(new RequestListener() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Drawable resource, Object model, Target target, DataSource dataSource, boolean isFirstResource) {
if (resource instanceof GifDrawable) {
response.onResult(PowerImageResult.genSucRet(new GlideMultiFrameImage((GifDrawable) resource, false)));
} else {
if (resource instanceof BitmapDrawable) {
response.onResult(PowerImageResult.genSucRet(new FlutterSingleFrameImage((BitmapDrawable) resource)));
} else {
response.onResult(PowerImageResult.genFailRet("Native加载失败: resource : " + String.valueOf(resource)));
}
}
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
```
#### Kotlin
```kotlin
class PowerImageNetworkLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
Glide.with(context).asDrawable().load(request.srcString())
.listener(object : RequestListener {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Drawable,
model: Any,
target: Target,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
if (resource is GifDrawable) {
response.onResult(
PowerImageResult.genSucRet(
GlideMultiFrameImage(
resource as GifDrawable,
false
)
)
)
} else {
if (resource is BitmapDrawable) {
response.onResult(
PowerImageResult.genSucRet(
FlutterSingleFrameImage(
resource as BitmapDrawable
)
)
)
} else {
response.onResult(PowerImageResult.genFailRet("Native加载失败: resource : $resource"))
}
}
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
```
native asset loader example:
#### Java
```java
public class PowerImageNativeAssetLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageNativeAssetLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
Resources resources = context.getResources();
int resourceId = 0;
try {
resourceId = resources.getIdentifier(request.srcString(),
"drawable", context.getPackageName());
} catch (Resources.NotFoundException e) {
// 资源未找到
e.printStackTrace();
}
if (resourceId == 0) {
response.onResult(PowerImageResult.genFailRet("资源未找到"));
return;
}
Glide.with(context).asBitmap().load(resourceId).listener(new RequestListener() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
```
#### Kotlin
```kotlin
class PowerImageNativeAssetLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
val resources = context.resources
var resourceId = 0
try {
resourceId = resources.getIdentifier(
request.srcString(),
"drawable", context.packageName
)
} catch (e: Resources.NotFoundException) {
// 资源未找到
e.printStackTrace()
}
if (resourceId == 0) {
response.onResult(PowerImageResult.genFailRet("资源未找到"))
return
}
Glide.with(context).asBitmap().load(resourceId).listener(object : RequestListener {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Bitmap?,
model: Any,
target: Target,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genSucRet(resource))
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
```
flutter asset loader example:
#### Java
```java
public class PowerImageFlutterAssetLoader implements PowerImageLoaderProtocol {
private Context context;
public PowerImageFlutterAssetLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
String name = request.srcString();
if (name == null || name.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"));
return;
}
String assetPackage = "";
if (request.src != null) {
assetPackage = (String) request.src.get("package");
}
String path;
if (assetPackage != null && assetPackage.length() > 0) {
path = FlutterMain.getLookupKeyForAsset(name, assetPackage);
} else {
path = FlutterMain.getLookupKeyForAsset(name);
}
if (path == null || path.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("path 为空"));
return;
}
Uri asset = Uri.parse("file:///android_asset/" + path);
Glide.with(context).asBitmap().load(asset).listener(new RequestListener() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
```
#### Kotlin
```kotlin
class PowerImageFlutterAssetLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
val name = request.srcString()
if (name == null || name.length <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"))
return
}
var assetPackage: String? = ""
if (request.src != null) {
assetPackage = request.src["package"] as String?
}
val path: String = if (assetPackage != null && assetPackage.length > 0) {
FlutterMain.getLookupKeyForAsset(name, assetPackage)
} else {
FlutterMain.getLookupKeyForAsset(name)
}
if (path.isEmpty()) {
response.onResult(PowerImageResult.genFailRet("path 为空"))
return
}
val asset = Uri.parse("file:///android_asset/$path")
Glide.with(context).asBitmap().load(asset).listener(object : RequestListener {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Bitmap?,
model: Any,
target: Target,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genSucRet(resource))
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
```
file loader example:
#### Java
```java
public class PowerImageFileLoader implements PowerImageLoaderProtocol {
private final Context context;
public PowerImageFileLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, PowerImageResponse response) {
String name = request.srcString();
if (name == null || name.length() <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"));
return;
}
Uri asset = Uri.parse("file://" + name);
Glide.with(context).asBitmap().load(asset).listener(new RequestListener() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + (e != null ? e.getMessage() : "null")));
return true;
}
@Override
public boolean onResourceReady(Bitmap resource, Object model, Target target, DataSource dataSource, boolean isFirstResource) {
response.onResult(PowerImageResult.genSucRet(resource));
return true;
}
}).submit(request.width <= 0 ? Target.SIZE_ORIGINAL : request.width,
request.height <= 0 ? Target.SIZE_ORIGINAL : request.height);
}
}
```
#### Kotlin
```kotlin
class PowerImageFileLoader(private val context: Context) : PowerImageLoaderProtocol {
override fun handleRequest(request: PowerImageRequestConfig, response: PowerImageResponse) {
val name = request.srcString()
if (name == null || name.length <= 0) {
response.onResult(PowerImageResult.genFailRet("src 为空"))
return
}
val asset = Uri.parse("file://$name")
Glide.with(context).asBitmap().load(asset).listener(object : RequestListener {
override fun onLoadFailed(
e: GlideException?,
model: Any,
target: Target,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genFailRet("Native加载失败: " + if (e != null) e.message else "null"))
return true
}
override fun onResourceReady(
resource: Bitmap?,
model: Any,
target: Target,
dataSource: DataSource,
isFirstResource: Boolean
): Boolean {
response.onResult(PowerImageResult.genSucRet(resource))
return true
}
}).submit(
if (request.width <= 0) Target.SIZE_ORIGINAL else request.width,
if (request.height <= 0) Target.SIZE_ORIGINAL else request.height
)
}
}
```
## API
network image:
```dart
PowerImage.network(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
```
nativeAsset:
```dart
PowerImage.nativeAsset(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
```
Flutter asset:
```dart
PowerImage.asset(
String src, {
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
String? package,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
```
File:
```dart
PowerImage.file(String src,
{Key key,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
String renderingType,
double imageWidth,
double imageHeight})
```
Custom Image Type:
1.Define custom ImageType like "album".
2.Define custom PowerImageRequestOptionsSrc to pass argument to Native loader.
3.Register custom loader in Android and iOS for "album" to receive argument and return Bitmap or UIImage.
4.Flutter Side will display Image successfully.
```dart
/// 自定义 imageType\src
/// 效果：将src encode 后，完成地传递给 native 对应 imageType 注册的 loader
/// 使用场景：
/// 例如，自定义加载相册照片，通过自定义 imageType 为 "album"，
/// native 侧注册 "album" 类型的 loader 自定义图片的加载。
PowerImage.type(
String imageType, {
required PowerImageRequestOptionsSrc src,
Key? key,
String? renderingType,
double? imageWidth,
double? imageHeight,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
```
.options
```dart
/// 更加灵活的方式，通过自定义options来展示图片
///
/// PowerImageRequestOptions({
/// @required this.src, //资源
/// @required this.imageType, //资源类型，如网络图，本地图或者自定义等
/// this.renderingType, //渲染方式，默认全局
/// this.imageWidth, //图片的渲染的宽度
/// this.imageHeight, //图片渲染的高度
/// });
///
/// PowerExternalImageProvider（FFI[bitmap]方案）
/// PowerTextureImageProvider（texture方案）
///
/// 使用场景：
/// 例如，自定义加载相册照片，通过自定义 imageType 为 "album"，
/// native 侧注册 "album" 类型的 loader 自定义图片的加载。
///
PowerImage.options(
PowerImageRequestOptions options, {
Key? key,
this.width,
this.height,
this.frameBuilder,
this.errorBuilder,
this.fit = BoxFit.cover,
this.alignment = Alignment.center,
this.semanticLabel,
this.excludeFromSemantics = false,
})
```
#### Android
```java
PowerImageLoader.getInstance().registerImageLoader(
new PowerImageAlbumLoader(application.getApplicationContext()), "album");
```
```java
public class PowerImageAlbumLoader implements PowerImageLoaderProtocol {
private final Context context;
public PowerImageAlbumLoader(Context context) {
this.context = context;
}
@Override
public void handleRequest(PowerImageRequestConfig request, final PowerImageResponse response) {
Map src = request.src;
if (src == null || src.get(Const.Argument.ASSET_ID) == null || src.get(Const.Argument.ASSET_TYPE) == null) {
PowerImageResult result = PowerImageResult.genFailRet("asset id or assetType == null");
response.onResult(result);
return;
}
AssetQuality quality = AssetQuality.values()[(int) src.get(Const.Argument.QUALITY)];
boolean highQuality = quality == AssetQuality.fullScreen;
final LocalMedia media = new LocalMedia();
media.fromMap(src);
final ThumbnailLoader thumbnailLoader = new ThumbnailLoader(context);
thumbnailLoader.load(media, highQuality, new ThumbnailLoader.ThumbnailLoadListener() {
@Override
public void onThumbnailLoaded(final Bitmap bitmap) {
PowerImageResult result;
if (bitmap == null) {
result = PowerImageResult.genFailRet("bitmap == null");
} else {
result = PowerImageResult.genSucRet(bitmap);
}
response.onResult(result);
}
});
}
}
```
#### iOS
```objective-c
[[PowerImageLoader sharedInstance] registerImageLoader:[AlbumAssetsImageLoader new] forType:@"album"];
```
```objective-c
- (void)handleRequest:(PowerImageRequestConfig *)requestConfig completed:(PowerImageLoaderCompletionBlock)completedBlock {
NSString *assetId = requestConfig.src[@"assetId"];
NSNumber *imageWidth = requestConfig.src[@"imageWidth"];
NSNumber *imageHeight = requestConfig.src[@"imageHeight"];
if (assetId) {
if (imageWidth && imageHeight) {
[[MPAssetManager sharedInstance] getImageWithAssetId:assetId
imageSize:CGSizeMake(imageWidth.doubleValue, imageHeight.doubleValue)
successHandler:^(UIImage *image) {
completedBlock([PowerImageResult successWithImage:image]);
} failureHandler:^(NSError *error) {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}];
} else {
[[MPAssetManager sharedInstance] getThumbnail:assetId
successHandler:^(UIImage *image) {
completedBlock([PowerImageResult successWithImage:image]);
} failureHandler:^(NSError *error) {
completedBlock([PowerImageResult failWithMessage:error.localizedDescription]);
}];
}
} else {
completedBlock([PowerImageResult failWithMessage:@"assetId is nil"]);
}
}
```
# Example
Network
```dart
return PowerImage.network(
'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg',
width: 100,
height: 100,
);
```
# Best practice
[Best practice](BESTPRACTICE.md)
# How it works
https://mp.weixin.qq.com/s/TdTGK21S-Yd3aD-yZDoYyQ