Cleanup ReactTextInputManager inner classes and helpers

Summary:
* Make inner classes static where possible
* Make member variables final when set from constructor
* Remove Nullable on `mFabricViewStateManager` and associated checks
* Remove `createInternalEditText` which has moved to the ShadowNode (paper-only)

Changelog: [Internal]

Reviewed By: genkikondo

Differential Revision: D36545807

fbshipit-source-id: 85517511d1734f0e55de5caa012e32feb40e8492

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java

@@ -114,8 +114,7 @@ public class ReactEditText extends AppCompatEditText
 
   private ReactViewBackgroundManager mReactBackgroundManager;
 
-  private final @Nullable FabricViewStateManager mFabricViewStateManager =
-      new FabricViewStateManager();
+  private final FabricViewStateManager mFabricViewStateManager = new FabricViewStateManager();
   protected boolean mDisableTextDiffing = false;
 
   protected boolean mIsSettingTextFromState = false;
@@ -642,7 +641,7 @@ public class ReactEditText extends AppCompatEditText
   // This is hacked in for Fabric. When we delete non-Fabric code, we might be able to simplify or
   // clean this up a bit.
   private void addSpansForMeasurement(Spannable spannable) {
-    if (mFabricViewStateManager != null && !mFabricViewStateManager.hasStateWrapper()) {
+    if (!mFabricViewStateManager.hasStateWrapper()) {
       return;
     }
 
@@ -748,9 +747,7 @@ public class ReactEditText extends AppCompatEditText
     // view, we don't need to construct one or apply it at all - it provides no use in Fabric.
     ReactContext reactContext = getReactContext(this);
 
-    if (mFabricViewStateManager != null
-        && !mFabricViewStateManager.hasStateWrapper()
-        && !reactContext.isBridgeless()) {
+    if (!mFabricViewStateManager.hasStateWrapper() && !reactContext.isBridgeless()) {
       final ReactTextInputLocalData localData = new ReactTextInputLocalData(this);
       UIManagerModule uiManager = reactContext.getNativeModule(UIManagerModule.class);
       if (uiManager != null) {
@@ -986,7 +983,7 @@ public class ReactEditText extends AppCompatEditText
    */
   private void updateCachedSpannable(boolean resetStyles) {
     // Noops in non-Fabric
-    if (mFabricViewStateManager != null && !mFabricViewStateManager.hasStateWrapper()) {
+    if (!mFabricViewStateManager.hasStateWrapper()) {
       return;
     }
     // If this view doesn't have an ID yet, we don't have a cache key, so bail here

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -27,7 +27,6 @@ import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.inputmethod.EditorInfo;
-import android.widget.EditText;
 import android.widget.TextView;
 import androidx.annotation.Nullable;
 import androidx.autofill.HintConstants;
@@ -972,12 +971,11 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
     return UIManagerHelper.getEventDispatcherForReactTag(reactContext, editText.getId());
   }
 
-  private class ReactTextInputTextWatcher implements TextWatcher {
-
-    private EventDispatcher mEventDispatcher;
-    private ReactEditText mEditText;
+  private final class ReactTextInputTextWatcher implements TextWatcher {
+    private final ReactEditText mEditText;
+    private final EventDispatcher mEventDispatcher;
+    private final int mSurfaceId;
     private String mPreviousText;
-    private int mSurfaceId;
 
     public ReactTextInputTextWatcher(
         final ReactContext reactContext, final ReactEditText editText) {
@@ -1013,24 +1011,23 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
         return;
       }
 
-      if (mEditText.getFabricViewStateManager().hasStateWrapper()) {
+      FabricViewStateManager stateManager = mEditText.getFabricViewStateManager();
+      if (stateManager.hasStateWrapper()) {
         // Fabric: communicate to C++ layer that text has changed
         // We need to call `incrementAndGetEventCounter` here explicitly because this
         // update may race with other updates.
         // We simply pass in the cache ID, which never changes, but UpdateState will still be called
         // on the native side, triggering a measure.
-        mEditText
-            .getFabricViewStateManager()
-            .setState(
-                new FabricViewStateManager.StateUpdateCallback() {
-                  @Override
-                  public WritableMap getStateUpdate() {
-                    WritableMap map = new WritableNativeMap();
-                    map.putInt("mostRecentEventCount", mEditText.incrementAndGetEventCounter());
-                    map.putInt("opaqueCacheId", mEditText.getId());
-                    return map;
-                  }
-                });
+        stateManager.setState(
+            new FabricViewStateManager.StateUpdateCallback() {
+              @Override
+              public WritableMap getStateUpdate() {
+                WritableMap map = new WritableNativeMap();
+                map.putInt("mostRecentEventCount", mEditText.incrementAndGetEventCounter());
+                map.putInt("opaqueCacheId", mEditText.getId());
+                return map;
+              }
+            });
       }
 
       // The event that contains the event counter and updates it must be sent first.
@@ -1126,11 +1123,11 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
   }
 
   private static class ReactContentSizeWatcher implements ContentSizeWatcher {
-    private ReactEditText mEditText;
-    private @Nullable EventDispatcher mEventDispatcher;
+    private final ReactEditText mEditText;
+    private final EventDispatcher mEventDispatcher;
+    private final int mSurfaceId;
     private int mPreviousContentWidth = 0;
     private int mPreviousContentHeight = 0;
-    private int mSurfaceId;
 
     public ReactContentSizeWatcher(ReactEditText editText) {
       mEditText = editText;
@@ -1174,17 +1171,15 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
     }
   }
 
-  private class ReactSelectionWatcher implements SelectionWatcher {
-
-    private ReactEditText mReactEditText;
-    private EventDispatcher mEventDispatcher;
+  private static class ReactSelectionWatcher implements SelectionWatcher {
+    private final ReactEditText mReactEditText;
+    private final EventDispatcher mEventDispatcher;
+    private final int mSurfaceId;
     private int mPreviousSelectionStart;
     private int mPreviousSelectionEnd;
-    private int mSurfaceId;
 
     public ReactSelectionWatcher(ReactEditText editText) {
       mReactEditText = editText;
-
       ReactContext reactContext = getReactContext(editText);
       mEventDispatcher = getEventDispatcher(reactContext, editText);
       mSurfaceId = UIManagerHelper.getSurfaceId(reactContext);
@@ -1213,12 +1208,11 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
   }
 
   private static class ReactScrollWatcher implements ScrollWatcher {
-
-    private ReactEditText mReactEditText;
-    private EventDispatcher mEventDispatcher;
+    private final ReactEditText mReactEditText;
+    private final EventDispatcher mEventDispatcher;
+    private final int mSurfaceId;
     private int mPreviousHoriz;
     private int mPreviousVert;
-    private int mSurfaceId;
 
     public ReactScrollWatcher(ReactEditText editText) {
       mReactEditText = editText;
@@ -1272,14 +1266,6 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
     view.setPadding(left, top, right, bottom);
   }
 
-  /**
-   * May be overridden by subclasses that would like to provide their own instance of the internal
-   * {@code EditText} this class uses to determine the expected size of the view.
-   */
-  protected EditText createInternalEditText(ThemedReactContext themedReactContext) {
-    return new EditText(themedReactContext);
-  }
-
   @Override
   public Object updateState(
       ReactEditText view, ReactStylesDiffMap props, StateWrapper stateWrapper) {
@@ -1290,17 +1276,15 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
     view.getFabricViewStateManager().setStateWrapper(stateWrapper);
 
     ReadableNativeMap state = stateWrapper.getStateData();
-
     if (state == null) {
       return null;
     }
-
     if (!state.hasKey("attributedString")) {
       return null;
     }
+
     ReadableMap attributedString = state.getMap("attributedString");
     ReadableMap paragraphAttributes = state.getMap("paragraphAttributes");
-
     if (attributedString == null || paragraphAttributes == null) {
       throw new IllegalArgumentException("Invalid TextInput State was received as a parameters");
     }