Fix on(Long)PressChange events in experimental press event API (#15256)

necolas · trueadm · commit f4625f51823d · 2019-03-29T11:58:29.000-07:00
Make sure that `onPressChange` is only called if `longPressCancelsPress` is `false`.
And make sure that `onLongPressChange` is called when a long press ends.
diff --git a/packages/react-events/src/Press.js b/packages/react-events/src/Press.js
@@ -80,7 +80,7 @@ function dispatchPressInEvents(
           true,
         );
       }
-      if (props.onLongPress) {
+      if (props.onLongPress && !props.longPressCancelsPress) {
         const longPressEventListener = e => {
           props.onLongPress(e);
           if (e.nativeEvent.defaultPrevented) {
@@ -110,7 +110,7 @@ function dispatchPressOutEvents(
       true,
     );
   }
-  if (props.onPressChange) {
+  if (props.onPressChange && !props.longPressCancelsPress) {
     const pressChangeEventListener = () => {
       props.onPressChange(false);
     };
@@ -121,6 +121,17 @@ function dispatchPressOutEvents(
       true,
     );
   }
+  if (state.isLongPressed && props.onLongPressChange) {
+    const longPressChangeEventListener = () => {
+      props.onLongPressChange(false);
+    };
+    context.dispatchEvent(
+      'longpresschange',
+      longPressChangeEventListener,
+      state.pressTarget,
+      true,
+    );
+  }
 }
 
 function isAnchorTagElement(eventTarget: EventTarget): boolean {
