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134 changes: 134 additions & 0 deletions
134
markdowntext/src/main/java/dev/jeziellago/compose/markdowntext/plugins/image/ImagesPlugin.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| package dev.jeziellago.compose.markdowntext.plugins.image | ||
|
|
||
| import android.content.Context | ||
| import android.graphics.drawable.Animatable | ||
| import android.graphics.drawable.Drawable | ||
| import android.text.Spanned | ||
| import android.widget.TextView | ||
| import coil.ImageLoader | ||
| import coil.request.Disposable | ||
| import coil.request.ImageRequest | ||
| import coil.target.Target | ||
| import io.noties.markwon.AbstractMarkwonPlugin | ||
| import io.noties.markwon.MarkwonConfiguration | ||
| import io.noties.markwon.MarkwonSpansFactory | ||
| import io.noties.markwon.image.AsyncDrawable | ||
| import io.noties.markwon.image.AsyncDrawableLoader | ||
| import io.noties.markwon.image.AsyncDrawableScheduler | ||
| import io.noties.markwon.image.DrawableUtils | ||
| import io.noties.markwon.image.ImageSpanFactory | ||
| import java.util.concurrent.atomic.AtomicBoolean | ||
|
|
||
| class ImagesPlugin private constructor( | ||
| private val imageLoader: ImageLoader, | ||
| private val coilStore: CoilStore, | ||
| private val imageDrawableLoader: AnimatedImageDrawableLoader = AnimatedImageDrawableLoader( | ||
| coilStore, | ||
| imageLoader | ||
| ) | ||
| ) : AbstractMarkwonPlugin() { | ||
|
|
||
| override fun configureSpansFactory(builder: MarkwonSpansFactory.Builder) { | ||
| builder.setFactory(org.commonmark.node.Image::class.java, ImageSpanFactory()) | ||
| } | ||
|
|
||
| override fun configureConfiguration(builder: MarkwonConfiguration.Builder) { | ||
| builder.asyncDrawableLoader(imageDrawableLoader) | ||
| } | ||
|
|
||
| override fun beforeSetText(textView: TextView, markdown: Spanned) { | ||
| AsyncDrawableScheduler.unschedule(textView) | ||
| } | ||
|
|
||
| override fun afterSetText(textView: TextView) { | ||
| AsyncDrawableScheduler.schedule(textView) | ||
| } | ||
|
|
||
| companion object { | ||
| private val cache: HashMap<AsyncDrawable, Disposable> = HashMap(2) | ||
|
|
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| fun create(context: Context, imageLoader: ImageLoader): ImagesPlugin { | ||
| val coilStore = object : CoilStore { | ||
| override fun load(drawable: AsyncDrawable): ImageRequest { | ||
| return ImageRequest.Builder(context) | ||
| .data(drawable.destination) | ||
| .build() | ||
| } | ||
|
|
||
| override fun cancel(disposable: Disposable) { | ||
| disposable.dispose() | ||
| } | ||
| } | ||
| return ImagesPlugin(imageLoader, coilStore) | ||
| } | ||
|
|
||
| class AnimatedImageDrawableLoader( | ||
| private val coilStore: CoilStore, | ||
| private val imageLoader: ImageLoader, | ||
| ) : AsyncDrawableLoader() { | ||
|
|
||
| override fun load(drawable: AsyncDrawable) { | ||
| val loaded = AtomicBoolean(false) | ||
| val target: Target = AnimatedDrawableTarget(drawable, loaded) | ||
| val request = coilStore.load(drawable).newBuilder() | ||
| .target(target) | ||
| .build() | ||
|
|
||
| val disposable = imageLoader.enqueue(request) | ||
| if (!loaded.get()) { | ||
| loaded.set(true) | ||
| cache[drawable] = disposable | ||
| } | ||
| } | ||
|
|
||
| override fun cancel(drawable: AsyncDrawable) { | ||
| val disposable = cache.remove(drawable) | ||
| if (disposable != null) { | ||
| coilStore.cancel(disposable) | ||
| } | ||
| } | ||
|
|
||
| override fun placeholder(drawable: AsyncDrawable): Drawable? = null | ||
|
|
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| class AnimatedDrawableTarget( | ||
| private val drawable: AsyncDrawable, | ||
| private val loaded: AtomicBoolean | ||
| ) : Target { | ||
| override fun onSuccess(result: Drawable) { | ||
| if (cache.remove(drawable) != null || !loaded.get()) { | ||
| loaded.set(true) | ||
| if (drawable.isAttached) { | ||
| DrawableUtils.applyIntrinsicBoundsIfEmpty(result) | ||
| drawable.result = result | ||
|
|
||
| if (result is Animatable) { | ||
| (result as Animatable).start() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override fun onStart(placeholder: Drawable?) { | ||
| if (placeholder != null && drawable.isAttached) { | ||
| DrawableUtils.applyIntrinsicBoundsIfEmpty(placeholder) | ||
| drawable.result = placeholder | ||
| } | ||
| } | ||
|
|
||
| override fun onError(error: Drawable?) { | ||
| if (cache.remove(drawable) != null) { | ||
| if (error != null && drawable.isAttached) { | ||
| DrawableUtils.applyIntrinsicBoundsIfEmpty(error) | ||
| drawable.result = error | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| interface CoilStore { | ||
| fun load(drawable: AsyncDrawable): ImageRequest | ||
| fun cancel(disposable: Disposable) | ||
| } | ||
| } |
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