Clean up some grossness in ScrollResponder

Summary: Still gross but less gross.

Reviewed By: sebmarkbage

Differential Revision: D7107180

fbshipit-source-id: 31f1639a8f44e4ab247c338001a4a5c9b4b83cdf

Libraries/Components/ScrollResponder.js

@@ -23,7 +23,6 @@ const performanceNow = require('fbjs/lib/performanceNow');
 const warning = require('fbjs/lib/warning');
 
 const { ScrollViewManager } = require('NativeModules');
-const { getInstanceFromNode } = require('ReactNativeComponentTree');
 
 /**
  * Mixin that can be integrated in order to handle scrolling that plays well
@@ -114,15 +113,6 @@ type State = {
 };
 type Event = Object;
 
-function isTagInstanceOfTextInput(tag) {
-  const instance = getInstanceFromNode(tag);
-  return instance && instance.viewConfig && (
-    instance.viewConfig.uiViewClassName === 'AndroidTextInput' ||
-    instance.viewConfig.uiViewClassName === 'RCTMultilineTextInputView' ||
-    instance.viewConfig.uiViewClassName === 'RCTSinglelineTextInputView'
-  );
-}
-
 const ScrollResponderMixin = {
   mixins: [Subscribable.Mixin],
   scrollResponderMixinGetInitialState: function(): State {
@@ -196,17 +186,27 @@ const ScrollResponderMixin = {
    * Invoke this from an `onStartShouldSetResponderCapture` event.
    */
   scrollResponderHandleStartShouldSetResponderCapture: function(e: Event): boolean {
-    // First see if we want to eat taps while the keyboard is up
+    // The scroll view should receive taps instead of its descendants if:
+    // * it is already animating/decelerating
+    if (this.scrollResponderIsAnimating()) {
+      return true;
+    }
+
+    // * the keyboard is up, keyboardShouldPersistTaps is 'never' (the default),
+    // and a new touch starts with a non-textinput target (in which case the
+    // first tap should be sent to the scroll view and dismiss the keyboard,
+    // then the second tap goes to the actual interior view)
     const currentlyFocusedTextInput = TextInputState.currentlyFocusedField();
     const {keyboardShouldPersistTaps} = this.props;
     const keyboardNeverPersistTaps = !keyboardShouldPersistTaps ||
                                     keyboardShouldPersistTaps === 'never';
     if (keyboardNeverPersistTaps &&
-      currentlyFocusedTextInput != null &&
-      !isTagInstanceOfTextInput(e.target)) {
+      currentlyFocusedTextInput != null
+      /* && !TextInputState.isTextInput(e.target) */) {
       return true;
     }
-    return this.scrollResponderIsAnimating();
+
+    return false;
   },
 
   /**

Libraries/Components/TextInput/TextInput.js

@@ -192,10 +192,6 @@ const DataDetectorTypes = [
 
 const TextInput = createReactClass({
   displayName: 'TextInput',
-  statics: {
-    /* TODO(brentvatne) docs are needed for this */
-    State: TextInputState,
-  },
 
   propTypes: {
     ...ViewPropTypes,
@@ -667,24 +663,30 @@ const TextInput = createReactClass({
 
   componentDidMount: function() {
     this._lastNativeText = this.props.value;
-    if (!this.context.focusEmitter) {
+    const tag = ReactNative.findNodeHandle(this._inputRef);
+    if (tag != null) {
+      // tag is null only in unit tests
+      TextInputState.registerInput(tag);
+    }
+
+    if (this.context.focusEmitter) {
+      this._focusSubscription = this.context.focusEmitter.addListener(
+        'focus',
+        el => {
+          if (this === el) {
+            this.requestAnimationFrame(this.focus);
+          } else if (this.isFocused()) {
+            this.blur();
+          }
+        },
+      );
+      if (this.props.autoFocus) {
+        this.context.onFocusRequested(this);
+      }
+    } else {
       if (this.props.autoFocus) {
         this.requestAnimationFrame(this.focus);
       }
-      return;
-    }
-    this._focusSubscription = this.context.focusEmitter.addListener(
-      'focus',
-      el => {
-        if (this === el) {
-          this.requestAnimationFrame(this.focus);
-        } else if (this.isFocused()) {
-          this.blur();
-        }
-      },
-    );
-    if (this.props.autoFocus) {
-      this.context.onFocusRequested(this);
     }
   },
 
@@ -693,6 +695,10 @@ const TextInput = createReactClass({
     if (this.isFocused()) {
       this.blur();
     }
+    const tag = ReactNative.findNodeHandle(this._inputRef);
+    if (tag != null) {
+      TextInputState.unregisterInput(tag);
+    }
   },
 
   getChildContext(): ViewChildContext {

Libraries/Components/TextInput/TextInputState.js

@@ -16,6 +16,8 @@
 const Platform = require('Platform');
 const UIManager = require('UIManager');
 
+const inputs = new Set();
+
 const TextInputState = {
    /**
    * Internal state
@@ -68,7 +70,19 @@ const TextInputState = {
         );
       }
     }
-  }
+  },
+
+  registerInput: function(textFieldID: number) {
+    inputs.add(textFieldID);
+  },
+
+  unregisterInput: function(textFieldID: number) {
+    inputs.delete(textFieldID);
+  },
+
+  isTextInput: function(textFieldID: number) {
+    return inputs.has(textFieldID);
+  },
 };
 
 module.exports = TextInputState;