修复自定义下载失败无失败回调以及新增全局自定义下载接口

Signed-off-by: zgf <zenggaofeng2@h-partners.com>

library/src/main/ets/ImageKnife.ets

@@ -38,7 +38,7 @@ export class ImageKnife {
   private _isRequestInSubThread: boolean = true;
   //定义全局网络请求header map
   headerMap: Map<string, Object> = new Map<string, Object>();
-
+  customGetImage: ((context: Context, src: string | PixelMap | Resource) => Promise<ArrayBuffer | undefined>) | undefined = undefined
   public static getInstance(): ImageKnife {
     if (!ImageKnife.instance) {
       ImageKnife.instance = new ImageKnife();
@@ -380,4 +380,14 @@ export class ImageKnife {
   getEngineKeyImpl(): IEngineKey {
     return this.dispatcher.getEngineKeyImpl();
   }
+  /**
+   * 全局设置自定义下载
+   * @param customGetImage 自定义请求函数
+   */
+  setCustomGetImage(customGetImage?: (context: Context, src: string | PixelMap | Resource) => Promise<ArrayBuffer | undefined>) {
+    this.customGetImage = customGetImage
+  }
+  getCustomGetImage(): undefined | ((context: Context, src: string | PixelMap | Resource) => Promise<ArrayBuffer | undefined>){
+    return this.customGetImage
+  }
 }

library/src/main/ets/ImageKnifeDispatcher.ets

@@ -179,7 +179,9 @@ export class ImageKnifeDispatcher {
       isAnimator:isAnimator
     }
 
-
+    if(request.customGetImage == undefined) {
+      request.customGetImage = ImageKnife.getInstance().getCustomGetImage()
+    }
     if (ImageKnife.getInstance().isRequestInSubThread){
       // 启动线程下载和解码主图
       LogUtil.log("ImageKnife_DataTime_getAndShowImage_Task.start:" + currentRequest.imageKnifeOption.loadSrc)
@@ -399,6 +401,7 @@ async function requestJob(request: RequestJobRequest, requestList?: List<ImageKn
     if (resBuf === undefined) {
       LogUtil.log("customGetImage customGetImage");
       resBuf = await request.customGetImage(request.context, request.src)
+      loadError = resBuf == undefined ? "customGetImage loadFile" : loadError
       // 保存文件缓存
       if (resBuf !== undefined && request.writeCacheStrategy !== CacheStrategy.Memory) {
         let copyBuf = buffer.concat([buffer.from(resBuf)]).buffer; // IDE有bug，不能直接获取resBuf.byteLength