fix: Show sized placeholder for hidden account media (#516)

Previous code showed a small icon for account media that the user has
hidden.

Now determine the correct size / aspect ratio for the media and use that
to compute the placeholder (either a blurhash, or the link colour for
consistency with the view on a timeline).

Fixes #513

app/src/main/java/app/pachli/components/account/media/AccountMediaFragment.kt

@@ -33,7 +33,6 @@ import androidx.recyclerview.widget.StaggeredGridLayoutManager
 import androidx.recyclerview.widget.StaggeredGridLayoutManager.VERTICAL
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout.OnRefreshListener
 import app.pachli.R
-import app.pachli.core.accounts.AccountManager
 import app.pachli.core.activity.RefreshableFragment
 import app.pachli.core.activity.openLink
 import app.pachli.core.common.extensions.hide
@@ -43,8 +42,6 @@ import app.pachli.core.designsystem.R as DR
 import app.pachli.core.navigation.AttachmentViewData
 import app.pachli.core.navigation.ViewMediaActivityIntent
 import app.pachli.core.network.model.Attachment
-import app.pachli.core.preferences.PrefKeys
-import app.pachli.core.preferences.SharedPreferencesRepository
 import app.pachli.databinding.FragmentTimelineBinding
 import com.google.android.material.color.MaterialColors
 import com.mikepenz.iconics.IconicsDrawable
@@ -52,7 +49,6 @@ import com.mikepenz.iconics.typeface.library.googlematerial.GoogleMaterial
 import com.mikepenz.iconics.utils.colorInt
 import com.mikepenz.iconics.utils.sizeDp
 import dagger.hilt.android.AndroidEntryPoint
-import javax.inject.Inject
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.launch
 
@@ -66,12 +62,6 @@ class AccountMediaFragment :
     RefreshableFragment,
     MenuProvider {
 
-    @Inject
-    lateinit var accountManager: AccountManager
-
-    @Inject
-    lateinit var sharedPreferencesRepository: SharedPreferencesRepository
-
     private val binding by viewBinding(FragmentTimelineBinding::bind)
 
     private val viewModel: AccountMediaViewModel by viewModels()
@@ -86,11 +76,9 @@ class AccountMediaFragment :
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         requireActivity().addMenuProvider(this, viewLifecycleOwner, Lifecycle.State.RESUMED)
 
-        val useBlurhash = sharedPreferencesRepository.getBoolean(PrefKeys.USE_BLURHASH, true)
-
         adapter = AccountMediaGridAdapter(
-            useBlurhash = useBlurhash,
             context = view.context,
+            statusDisplayOptions = viewModel.statusDisplayOptions.value,
             onAttachmentClickListener = ::onAttachmentClick,
         )
 

app/src/main/java/app/pachli/components/account/media/AccountMediaGridAdapter.kt

@@ -1,6 +1,8 @@
 package app.pachli.components.account.media
 
 import android.content.Context
+import android.graphics.drawable.Drawable
+import android.graphics.drawable.PaintDrawable
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -14,15 +16,18 @@ import app.pachli.core.activity.decodeBlurHash
 import app.pachli.core.common.extensions.show
 import app.pachli.core.common.extensions.visible
 import app.pachli.core.navigation.AttachmentViewData
+import app.pachli.core.network.model.Attachment
 import app.pachli.databinding.ItemAccountMediaBinding
 import app.pachli.util.BindingHolder
+import app.pachli.util.StatusDisplayOptions
 import app.pachli.util.getFormattedDescription
 import app.pachli.util.iconResource
 import com.bumptech.glide.Glide
+import com.google.android.material.color.MaterialColors
 
 class AccountMediaGridAdapter(
-    private val useBlurhash: Boolean,
     context: Context,
+    statusDisplayOptions: StatusDisplayOptions,
     private val onAttachmentClickListener: (AttachmentViewData, View) -> Unit,
 ) : PagingDataAdapter<AttachmentViewData, BindingHolder<ItemAccountMediaBinding>>(
     object : DiffUtil.ItemCallback<AttachmentViewData>() {
@@ -35,10 +40,17 @@ class AccountMediaGridAdapter(
         }
     },
 ) {
+    var statusDisplayOptions = statusDisplayOptions
+        set(value) {
+            field = value
+            notifyItemRangeChanged(0, itemCount)
+        }
 
     private val playableIcon = AppCompatResources.getDrawable(context, R.drawable.ic_play_indicator)
     private val mediaHiddenDrawable = AppCompatResources.getDrawable(context, R.drawable.ic_hide_media_24dp)
 
+    val defaultSize = context.resources.getDimensionPixelSize(app.pachli.core.designsystem.R.dimen.account_media_grid_default)
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BindingHolder<ItemAccountMediaBinding> {
         val binding = ItemAccountMediaBinding.inflate(LayoutInflater.from(parent.context), parent, false)
         return BindingHolder(binding)
@@ -49,17 +61,17 @@ class AccountMediaGridAdapter(
 
         val context = root.context
 
-        val placeholder = item.attachment.blurhash?.let {
-            if (useBlurhash) decodeBlurHash(context, it) else null
-        }
-
         when {
             item.sensitive && !item.isRevealed -> {
                 overlay.show()
                 overlay.setImageDrawable(mediaHiddenDrawable)
+                overlay.setBackgroundResource(R.drawable.media_warning_bg)
+
+                val (placeholder, width, height) = item.attachment.placeholder(context, preview)
 
                 Glide.with(preview)
                     .load(placeholder)
+                    .override(width, height)
                     .centerInside()
                     .into(preview)
 
@@ -68,8 +80,11 @@ class AccountMediaGridAdapter(
 
             item.attachment.isPreviewable() -> {
                 if (item.attachment.type.isPlayable()) overlay.setImageDrawable(playableIcon)
+                overlay.setBackgroundResource(0)
                 overlay.visible(item.attachment.type.isPlayable())
 
+                val (placeholder, _, _) = item.attachment.placeholder(context, preview)
+
                 Glide.with(preview)
                     .asBitmap()
                     .load(item.attachment.previewUrl)
@@ -81,6 +96,7 @@ class AccountMediaGridAdapter(
 
             else -> {
                 if (item.attachment.type.isPlayable()) overlay.setImageDrawable(playableIcon)
+                overlay.setBackgroundResource(0)
                 overlay.visible(item.attachment.type.isPlayable())
 
                 Glide.with(preview)
@@ -101,4 +117,50 @@ class AccountMediaGridAdapter(
             true
         }
     }
+
+    /**
+     * Determine the placeholder for this [Attachment].
+     *
+     * @return A triple of the [Drawable] that should be used for the placeholder, and the
+     *     width and height to set on the imageview displaying the placeholder.
+     */
+    fun Attachment.placeholder(context: Context, view: View): Triple<Drawable?, Int, Int> {
+        //  To avoid the list jumping when the user taps the placeholder to reveal the media
+        //  the placeholder must have the same size as the underlying preview.
+        //
+        // To do this take the height and width of the `small` image from the attachment
+        // metadata. If height doesn't exist / is null try and compute it from the width and
+        // the aspect ratio, falling back to 100 if both are missing.
+        //
+        // Do the same to compute the width.
+        val height = when {
+            meta?.small?.height != null -> meta?.small?.height!!
+            meta?.small?.width != null && meta?.small?.aspect != null ->
+                (meta?.small?.width!! / meta?.small?.aspect!!).toInt()
+            else -> defaultSize
+        }
+
+        val width = when {
+            meta?.small?.width != null -> meta?.small?.width!!
+            meta?.small?.aspect != null -> (height * meta?.small?.aspect!!).toInt()
+            else -> defaultSize
+        }
+
+        // The drawable's height and width does not need to be as large, as it will be
+        // automatically scaled by Glide. Set to a max height of 32, and scale the width
+        // appropriately.
+        val placeholderHeight = 32
+        val placeholderWidth = (placeholderHeight * (meta?.small?.aspect ?: 1.0)).toInt()
+
+        val placeholder = if (statusDisplayOptions.useBlurhash) {
+            blurhash?.let { decodeBlurHash(context, it, placeholderWidth, placeholderHeight) }
+        } else {
+            PaintDrawable(MaterialColors.getColor(view, android.R.attr.textColorLink)).apply {
+                intrinsicHeight = placeholderHeight
+                intrinsicWidth = placeholderWidth
+            }
+        }
+
+        return Triple(placeholder, width, height)
+    }
 }

app/src/main/java/app/pachli/components/account/media/AccountMediaViewModel.kt

@@ -25,6 +25,7 @@ import androidx.paging.cachedIn
 import app.pachli.core.accounts.AccountManager
 import app.pachli.core.navigation.AttachmentViewData
 import app.pachli.core.network.retrofit.MastodonApi
+import app.pachli.util.StatusDisplayOptionsRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import javax.inject.Inject
 
@@ -32,6 +33,7 @@ import javax.inject.Inject
 class AccountMediaViewModel @Inject constructor(
     accountManager: AccountManager,
     api: MastodonApi,
+    statusDisplayOptionsRepository: StatusDisplayOptionsRepository,
 ) : ViewModel() {
 
     lateinit var accountId: String
@@ -42,6 +44,8 @@ class AccountMediaViewModel @Inject constructor(
 
     val activeAccount = accountManager.activeAccount!!
 
+    val statusDisplayOptions = statusDisplayOptionsRepository.flow
+
     @OptIn(ExperimentalPagingApi::class)
     val media = Pager(
         config = PagingConfig(

app/src/main/res/layout/item_account_media.xml

@@ -18,6 +18,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
+        android:padding="4dp"
         android:importantForAccessibility="no" />
 
 </FrameLayout>

core/activity/src/main/kotlin/app/pachli/core/activity/ImageLoadingHelper.kt

@@ -69,6 +69,6 @@ fun loadAvatar(
     }
 }
 
-fun decodeBlurHash(context: Context, blurhash: String): BitmapDrawable {
+fun decodeBlurHash(context: Context, blurhash: String, width: Int = 32, height: Int = 32): BitmapDrawable {
-    return BitmapDrawable(context.resources, BlurHashDecoder.decode(blurhash, 32, 32, 1f))
+    return BitmapDrawable(context.resources, BlurHashDecoder.decode(blurhash, width, height, 1f))
 }

core/designsystem/src/main/res/values/dimens.xml

@@ -61,7 +61,7 @@
 
     <dimen name="avatar_toolbar_nav_icon_size">36dp</dimen>
 
-    <dimen name="profile_media_spacing">3dp</dimen>
+    <dimen name="profile_media_spacing">4dp</dimen>
 
     <dimen name="preview_image_spacing">4dp</dimen>
 
@@ -72,6 +72,8 @@
     <dimen name="timeline_status_avatar_height">48dp</dimen>
     <dimen name="timeline_status_avatar_width">48dp</dimen>
 
+    <dimen name="account_media_grid_default">130dp</dimen>
+
     <!-- Adjust the dimensions of items in the Material drawer to provide a
          slightly tighter layout while ensuring that minimum touch sizes are
          maintained.