/**模仿 coil DSL写法**/
fun ImageView.load(load: Any?, options: (ImageOptions.() -> Unit)? = null) {
    ImageLoader.loadImage(ImageOptions(load).also(options))
}

/**
 * 图片加载库的配置，封装原始加载配置属性，进行转换
 */
class ImageOptions {
    /*** 加载原始资源*/
    var res: Any? = null
    /*** 显示容器*/
    var imageView: ImageView? = null
    /*** imageView存在的上下文或者fragment\activity*/
    var context: Any? = null
        get() {
            return field ?: imageView
        }
    /*** 加载占位图资源ID，如果placeholder是0表示没有占位图*/
    @DrawableRes
    var placeHolderResId = 0
		.... 省略其动画、错误图等等他属性
    var centerCrop: Boolean = false
    /*** 网络进度监听器*/
    var onProgressListener: OnProgressListener? = null
    /*** 加载监听*/
    var requestListener: OnImageListener? = null
	  ....省略缓存策略和优先级等等枚举
}

/**Glide策略封装*/
object ImageLoader {
    fun loadImage(options: ImageOptions) {
        Preconditions.checkNotNull(options, "ImageConfigImpl is required")
        val context = options.context
        Preconditions.checkNotNull(context, "Context is required")
        Preconditions.checkNotNull(options.imageView, "ImageView is required")
        val requestsWith = glideRequests(context)
        //根据类型获取
        val glideRequest = when (options.res) {
            is String -> requestsWith.load(options.res as String)
            is Bitmap -> requestsWith.load(options.res as Bitmap)
            is Drawable -> requestsWith.load(options.res as Drawable)
            is Uri -> requestsWith.load(options.res as Uri)
            is URL -> requestsWith.load(options.res as URL)
            is File -> requestsWith.load(options.res as File)
            is Int -> requestsWith.load(options.res as Int)
            is ByteArray -> requestsWith.load(options.res as ByteArray)
            else -> requestsWith.load(options.res)
        }

        glideRequest.apply {
            // 占位图、错误图
            ...
            //缓存配置,优先级,缩略图请求
            ...
            //动画、transformation
            into(GlideImageViewTarget(options.imageView, options.res))
        }

        options.onProgressListener?.let {
            ProgressManager.addListener(options.res.toString(), options.onProgressListener)
        }
    }
    private fun glideRequests(context: Any?): GlideRequests {
        return when (context) {
            is Context -> IGlideModule.with(context)
            is Activity -> IGlideModule.with(context)
            is FragmentActivity -> IGlideModule.with(context)
            is Fragment -> IGlideModule.with(context)
            is android.app.Fragment -> IGlideModule.with(context)
            is View -> IGlideModule.with(context)
            else -> throw NullPointerException("not support")
        }
    }
}

class DSLTest{
  //普通变量
  var str:String? =null
  //函数变量
  var onSuccess: ((String?) -> Unit)? = null
	//调用函数变量
  fun onSuccessDo() {
    	...
  		onSuccess.invoke("success $str")
  }
}
//定义调用的函数
load(dslPar:(DSLTest.() -> Unit)? = null){
   DSLTest().also(dslPar)
}
//使用
load{
  str = "ACC"
  onSuccess{
    //TODO
  }
}

/** 图片加载策略  接口*/
public interface BaseImageLoaderStrategy {
    void loadImage(load Any,ImageOptions options);
}

/*** 具体的加载策略， Glide 加载框架*/
public class GlideImageLoader implements BaseImageLoaderStrategy {
    @Override
    public void loadImage(Context context, ImageOptions options) {
        Glide.with(context).apply(...).into(options.getImgView());
    }
}

ImageLoader.loadImage(ImageOptions(imageView).apply{
	.....
})

//可选参数示例
load(url:String,isCirle:Boolean = false, width:Int=0, height:Int = 0){
  .....
}
//用 参数名 = 值 使用可选参数
iv_8.load(url2, height = 800)