(fix) onSelectionChange is not triggered on android devices

android/src/main/java/com/mattermost/pasteinputtext/PasteInputEditText.kt

@@ -17,6 +17,20 @@ class PasteInputEditText(context: ThemedReactContext) : ReactEditText(context) {
   private lateinit var mOnPasteListener: IPasteInputListener
   private lateinit var mPasteEventDispatcher: EventDispatcher
   private var mDisabledCopyPaste: Boolean = false
+  private var mSelectionWatcher: SelectionWatcher? = null
+
+  interface SelectionWatcher {
+    fun onSelectionChanged(selStart: Int, selEnd: Int)
+  }
+
+  fun setSelectionWatcher(selectionWatcher: SelectionWatcher?) {
+      mSelectionWatcher = selectionWatcher
+  }
+
+  override fun onSelectionChanged(selStart: Int, selEnd: Int) {
+      super.onSelectionChanged(selStart, selEnd)
+      mSelectionWatcher?.onSelectionChanged(selStart, selEnd)
+  }
 
   fun setDisableCopyPaste(disabled: Boolean) {
     this.mDisabledCopyPaste = disabled

android/src/main/java/com/mattermost/pasteinputtext/PasteTextInputManager.kt

@@ -50,6 +50,20 @@ class PasteTextInputManager(context: ReactApplicationContext) : ReactTextInputMa
 
     val pasteInputEditText = editText as PasteInputEditText
     val eventDispatcher = getEventDispatcher(reactContext, editText)
+
+    pasteInputEditText.setSelectionWatcher(object : PasteInputEditText.SelectionWatcher {
+      override fun onSelectionChanged(selStart: Int, selEnd: Int) {
+          eventDispatcher?.dispatchEvent(
+              PasteTextInputSelectionChangeEvent(
+                  UIManagerHelper.getSurfaceId(reactContext),
+                  pasteInputEditText.id,
+                  selStart,
+                  selEnd
+              )
+          )
+      }
+    })
+
     pasteInputEditText.setOnPasteListener(PasteInputListener(pasteInputEditText, reactContext.surfaceId), eventDispatcher)
   }
 
@@ -63,6 +77,23 @@ class PasteTextInputManager(context: ReactApplicationContext) : ReactTextInputMa
     return map
   }
 
+  override fun getExportedCustomDirectEventTypeConstants(): MutableMap<String, Any> {
+    return MapBuilder.builder<String, Any>()
+        .put(
+            "onSelectionChange",
+            MapBuilder.of("registrationName", "onSelectionChange")
+        )
+        .put(
+            "onContentSizeChange", 
+            MapBuilder.of("registrationName", "onContentSizeChange")
+        )
+        .put(
+            "onScroll", 
+            MapBuilder.of("registrationName", "onScroll")
+        )
+        .build()
+  }
+
   companion object {
     const val NAME = "PasteTextInput"
     const val CACHE_DIR_NAME = "mmPasteInput"

android/src/main/java/com/mattermost/pasteinputtext/PasteTextInputSelectionChangeEvent.kt

@@ -0,0 +1,28 @@
+package com.mattermost.pasteinputtext
+
+import com.facebook.react.bridge.Arguments
+import com.facebook.react.bridge.WritableMap
+import com.facebook.react.uimanager.UIManagerHelper
+import com.facebook.react.uimanager.events.Event
+
+class PasteTextInputSelectionChangeEvent(
+    surfaceId: Int,
+    viewId: Int,
+    private val mSelectionStart: Int,
+    private val mSelectionEnd: Int
+) : Event<PasteTextInputSelectionChangeEvent>(surfaceId, viewId) {
+
+    override fun getEventName(): String = "onSelectionChange"
+
+    override fun getCoalescingKey(): Short = 0
+
+    override fun getEventData(): WritableMap {
+        val eventData = Arguments.createMap()
+        eventData.putInt("target", viewTag)
+        val selection = Arguments.createMap()
+        selection.putInt("start", mSelectionStart)
+        selection.putInt("end", mSelectionEnd)
+        eventData.putMap("selection", selection)
+        return eventData
+    }
+}