Show loading/error for images in catalogue grid view. Update support lib

app/src/main/java/eu/kanade/tachiyomi/widget/StateImageViewTarget.kt

@@ -0,0 +1,49 @@
+package eu.kanade.tachiyomi.widget
+
+import android.graphics.drawable.Drawable
+import android.widget.ImageView
+import android.widget.ImageView.ScaleType
+import android.widget.ProgressBar
+import com.bumptech.glide.load.resource.drawable.GlideDrawable
+import com.bumptech.glide.request.animation.GlideAnimation
+import com.bumptech.glide.request.target.GlideDrawableImageViewTarget
+import eu.kanade.tachiyomi.util.gone
+import eu.kanade.tachiyomi.util.visible
+
+/**
+ * A glide target to display an image with an optional progress bar and a configurable scale type
+ * for the error drawable.
+ *
+ * @param view the view where the image will be loaded
+ * @param progress an optional progress bar to show when the image is loading.
+ * @param errorScaleType the scale type for the error drawable, [ScaleType.CENTER] by default.
+ */
+class StateImageViewTarget(view: ImageView,
+                           val progress: ProgressBar? = null,
+                           val errorScaleType: ScaleType = ScaleType.CENTER) :
+        GlideDrawableImageViewTarget(view) {
+
+    private val imageScaleType = view.scaleType
+
+    override fun onLoadStarted(placeholder: Drawable?) {
+        progress?.visible()
+        super.onLoadStarted(placeholder)
+    }
+
+    override fun onLoadFailed(e: Exception?, errorDrawable: Drawable?) {
+        progress?.gone()
+        view.scaleType = errorScaleType
+        super.onLoadFailed(e, errorDrawable)
+    }
+
+    override fun onLoadCleared(placeholder: Drawable?) {
+        progress?.gone()
+        super.onLoadCleared(placeholder)
+    }
+
+    override fun onResourceReady(resource: GlideDrawable?, animation: GlideAnimation<in GlideDrawable>?) {
+        progress?.gone()
+        view.scaleType = imageScaleType
+        super.onResourceReady(resource, animation)
+    }
+}