Do not eat taps/clicks in ScrollView when soft-keyboard is detached from viewport

Summary:
If currently focused on a TextInput, clicking an item in a ScrollView takes two clicks.

This is because of `keyboardShouldPersistTaps`, which will fire despite a lack of keyboard events on Android due to special-casing.

This behavior is jarring in scenarios like VR where the soft keyboard is detached from the application. This change avoids eating taps, in this case, where a soft keyboard is open but not inset.

Reviewed By: genkikondo

Differential Revision: D38529237

fbshipit-source-id: a10c5dbf04e6288e0e9e0c805215054bc883339f

Libraries/Components/ScrollView/ScrollView.js

@@ -1510,6 +1510,11 @@ class ScrollView extends React.Component<Props, State> {
       return false;
     }
 
+    // Let presses through if the soft keyboard is detached from the viewport
+    if (this._softKeyboardIsDetached()) {
+      return false;
+    }
+
     if (
       keyboardNeverPersistTaps &&
       this._keyboardIsDismissible() &&
@@ -1548,6 +1553,15 @@ class ScrollView extends React.Component<Props, State> {
     return hasFocusedTextInput && softKeyboardMayBeOpen;
   };
 
+  /**
+   * Whether an open soft keyboard is present which does not overlap the
+   * viewport. E.g. for a VR soft-keyboard which is detached from the app
+   * viewport.
+   */
+  _softKeyboardIsDetached: () => boolean = () => {
+    return this._keyboardMetrics != null && this._keyboardMetrics.height === 0;
+  };
+
   /**
    * Invoke this from an `onTouchEnd` event.
    *
@@ -1556,6 +1570,21 @@ class ScrollView extends React.Component<Props, State> {
   _handleTouchEnd: (e: PressEvent) => void = (e: PressEvent) => {
     const nativeEvent = e.nativeEvent;
     this._isTouching = nativeEvent.touches.length !== 0;
+
+    const {keyboardShouldPersistTaps} = this.props;
+    const keyboardNeverPersistsTaps =
+      !keyboardShouldPersistTaps || keyboardShouldPersistTaps === 'never';
+
+    // Dismiss the keyboard now if we didn't become responder in capture phase
+    // to eat presses, but still want to dismiss on interaction.
+    if (
+      this._softKeyboardIsDetached() &&
+      this._keyboardIsDismissible() &&
+      keyboardNeverPersistsTaps
+    ) {
+      TextInputState.blurTextInput(TextInputState.currentlyFocusedInput());
+    }
+
     this.props.onTouchEnd && this.props.onTouchEnd(e);
   };