Convert SeekBarMountable to Primitive

Summary: As per title

Reviewed By: mkarpio

Differential Revision: D47359059

fbshipit-source-id: b285bf5624c06c69a5e897eccc3616f485fb1bf0

sample/src/main/java/com/facebook/samples/litho/kotlin/animations/dynamicprops/SeekBarPrimitive.kt

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.facebook.samples.litho.kotlin.animations.dynamicprops
+
+import android.widget.SeekBar
+import com.facebook.litho.LithoPrimitive
+import com.facebook.litho.PrimitiveComponent
+import com.facebook.litho.PrimitiveComponentScope
+import com.facebook.litho.Style
+import com.facebook.rendercore.primitives.EqualDimensionsLayoutBehavior
+import com.facebook.rendercore.primitives.ViewAllocator
+
+class SeekBarPrimitive(
+    private val onProgressChange: (Float) -> Unit,
+    private val initialValue: Float = 0f,
+    private val style: Style? = null
+) : PrimitiveComponent() {
+
+  private val MAX = 256
+
+  override fun PrimitiveComponentScope.render(): LithoPrimitive {
+    return LithoPrimitive(
+        layoutBehavior = EqualDimensionsLayoutBehavior(),
+        mountBehavior =
+            MountBehavior(ViewAllocator { context -> SeekBar(context) }) {
+              bind(initialValue) { content ->
+                val defaultMax = content.max
+                content.max = MAX
+                content.progress = (initialValue * MAX).toInt()
+                onUnbind {
+                  content.max = defaultMax
+                  content.progress = 0
+                }
+              }
+
+              bind(onProgressChange) { content ->
+                content.setOnSeekBarChangeListener(
+                    object : SeekBar.OnSeekBarChangeListener {
+                      override fun onProgressChanged(
+                          seekBar: SeekBar,
+                          progress: Int,
+                          fromUser: Boolean
+                      ) {
+                        onProgressChange(progress / MAX.toFloat())
+                      }
+
+                      override fun onStartTrackingTouch(seekBar: SeekBar) = Unit
+
+                      override fun onStopTrackingTouch(seekBar: SeekBar) = Unit
+                    })
+                onUnbind { content.setOnSeekBarChangeListener(null) }
+              }
+            },
+        style = style)
+  }
+}

sample/src/main/java/com/facebook/samples/litho/kotlin/animations/dynamicprops/SeekBarSpec.kt

@@ -85,7 +85,7 @@ fun ResourcesScope.SeekBar(
 ): Component = Row {
   label?.let { child(Text(label, style = Style.margin(end = 10.dp))) }
   child(
-      SeekBarMountable(
+      SeekBarPrimitive(
           initialValue = initialValue,
           onProgressChange = onProgressChanged,
           style = Style.height(14.dp).flex(grow = 1f) + style))