draft: switch to overlay for focus indicator

app/src/main/java/com/keylesspalace/tusky/components/compose/dialog/FocusDialog.kt

@@ -45,6 +45,7 @@ import com.bumptech.glide.util.Util
 import com.github.chrisbanes.photoview.OnPhotoTapListener
 import com.github.chrisbanes.photoview.PhotoView
 import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.databinding.DialogFocusBinding
 import com.keylesspalace.tusky.entity.Attachment.Focus
 import kotlinx.coroutines.launch
 import java.nio.ByteBuffer
@@ -161,48 +162,15 @@ fun <T> T.makeFocusDialog(
     previewUri: Uri,
     onUpdateFocus: suspend (Focus) -> Boolean
 ) where T : Activity, T : LifecycleOwner {
-    var focus = existingFocus ?: Focus(0.0f, 0.0f) // Default to center
+    val focus = existingFocus ?: Focus(0.0f, 0.0f) // Default to center
 
-    val dialogLayout = LinearLayout(this)
+    val dialogBinding = DialogFocusBinding.inflate(layoutInflater)
-    val padding = Utils.dpToPx(this, 8)
-    dialogLayout.setPadding(padding, padding, padding, padding)
-    dialogLayout.orientation = LinearLayout.VERTICAL
 
-    val baseImageRequest = Glide.with(this)
+    Glide.with(this)
         .load(previewUri)
         .downsample(DownsampleStrategy.CENTER_INSIDE)
+        .into(dialogBinding.imageView)
 
-    var imageView: PhotoView? = null
-
-    // Note all calls of this function are after imageView goes non-null
-    fun imageRequest() {
-        baseImageRequest.transform(HighlightFocus(focus))
-            .into(object : CustomTarget<Drawable>(4096, 4096) {
-                override fun onLoadCleared(placeholder: Drawable?) {
-                    imageView!!.setImageDrawable(placeholder)
-                }
-
-                override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
-                    imageView!!.setImageDrawable(resource)
-                }
-            })
-    }
-
-    imageView = PhotoView(this).apply {
-        maximumScale = 6f
-        setOnPhotoTapListener(object : OnPhotoTapListener {
-            override fun onPhotoTap(view: ImageView, x: Float, y: Float) {
-                focus = Focus(x * 2 - 1, 1 - y * 2) // PhotoView range is 0..1 Y-down but Mastodon API range is -1..1 Y-up
-                imageRequest()
-            }
-        })
-    }
-
-    val margin = Utils.dpToPx(this, 4)
-    dialogLayout.addView(imageView)
-    (imageView.layoutParams as LinearLayout.LayoutParams).weight = 1f
-    imageView.layoutParams.height = 0
-    (imageView.layoutParams as LinearLayout.LayoutParams).setMargins(0, margin, 0, 0)
 
     val okListener = { dialog: DialogInterface, _: Int ->
         lifecycleScope.launch {
@@ -214,7 +182,7 @@ fun <T> T.makeFocusDialog(
     }
 
     val dialog = AlertDialog.Builder(this)
-        .setView(dialogLayout)
+        .setView(dialogBinding.root)
         .setPositiveButton(android.R.string.ok, okListener)
         .setNegativeButton(android.R.string.cancel, null)
         .create()
@@ -226,8 +194,7 @@ fun <T> T.makeFocusDialog(
 
     dialog.show()
 
-    // Load the image and manually set it into the ImageView because it doesn't have a fixed  size.
+
-    imageRequest()
 }
 
 private fun Activity.showFailedFocusMessage() {

app/src/main/java/com/keylesspalace/tusky/components/compose/view/FocusIndicatorView.kt

@@ -0,0 +1,54 @@
+package com.keylesspalace.tusky.components.compose.view
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.drawable.Drawable
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.View
+import androidx.appcompat.content.res.AppCompatResources
+import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.entity.Attachment
+
+class FocusIndicatorView
+@JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+    private var focusDrawable: Drawable = AppCompatResources.getDrawable(context, R.drawable.spellcheck)!! // TODO: use an actual drawable suited as indicator
+    private var posX = 0f
+    private var posY = 0f
+
+    fun setFocus(focus: Attachment.Focus) {
+        // TODO
+        invalidate()
+    }
+
+    fun getFocus() {
+        // TODO
+        invalidate()
+    }
+
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+        // TODO: only handle events if they are on top of the image below
+        // TODO: don't handle all event actions
+
+        posX = event.x
+        posY = event.y
+        invalidate()
+        return true
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        focusDrawable.setBounds(
+            posX.toInt() - focusDrawable.intrinsicWidth / 2,
+            posY.toInt() - focusDrawable.intrinsicHeight / 2,
+            posX.toInt() + focusDrawable.intrinsicWidth / 2,
+            posY.toInt() + focusDrawable.intrinsicHeight / 2
+        )
+        focusDrawable.draw(canvas)
+    }
+}

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

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <!-- todo add padding -->
+    <ImageView
+        android:id="@+id/imageView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <com.keylesspalace.tusky.components.compose.view.FocusIndicatorView
+        android:id="@+id/focusIndicator"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>