GlideImageGetter.kt

package com.automattic.freshlypressed.util

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.drawable.BitmapDrawable
import android.graphics.drawable.Drawable
import android.text.Html
import android.widget.TextView

import com.bumptech.glide.Glide
import com.bumptech.glide.request.Request
import com.bumptech.glide.request.RequestOptions
import com.bumptech.glide.request.target.SizeReadyCallback
import com.bumptech.glide.request.target.Target
import com.bumptech.glide.request.transition.Transition

class GlideImageGetter internal constructor(private val context: Context, private val textView: TextView) : Html.ImageGetter {

    override fun getDrawable(url: String): Drawable {
        val drawable = BitmapDrawablePlaceholder()

        Glide.with(context)
                .asBitmap()
                .apply(RequestOptions().override(600, 200))
                .load(url)
                .into(drawable)

        return drawable
    }

    private inner class BitmapDrawablePlaceholder internal constructor() : BitmapDrawable(context.resources, Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888)), Target<Bitmap> {

        private var bitmapDrawable: Drawable? = null

        override fun draw(canvas: Canvas) {
            if (bitmapDrawable != null) {
                bitmapDrawable!!.draw(canvas)
            }
        }

        private fun setDrawable(drawable: Drawable) {
            this.bitmapDrawable = drawable
            val drawableWidth = drawable.intrinsicWidth
            val drawableHeight = drawable.intrinsicHeight

            drawable.setBounds(0, 0, drawableWidth, drawableHeight)
            setBounds(0, 0, drawableWidth, drawableHeight)

            drawable.invalidateSelf()

            textView.text = textView.text
        }

        override fun onLoadStarted(placeholderDrawable: Drawable?) {
            if (placeholderDrawable != null) {
                setDrawable(placeholderDrawable)
            }
        }

        override fun onLoadFailed(errorDrawable: Drawable?) {
            if (errorDrawable != null) {
                setDrawable(errorDrawable)
            }
        }

        override fun onResourceReady(bitmap: Bitmap, transition: Transition<in Bitmap>?) {
            setDrawable(BitmapDrawable(context.resources, bitmap))
        }

        override fun onLoadCleared(placeholderDrawable: Drawable?) {
            if (placeholderDrawable != null) {
                setDrawable(placeholderDrawable)
            }
        }

        override fun getSize(cb: SizeReadyCallback) {
            textView.post { cb.onSizeReady(textView.width, textView.height) }
        }

        override fun removeCallback(cb: SizeReadyCallback) {}
        override fun setRequest(request: Request?) {}
        override fun getRequest(): Request? {
            return null
        }
        override fun onStart() {}
        override fun onStop() {}
        override fun onDestroy() {}
    }
}