I tried passing in a function through #scroll then tried to detect the scroll event with document.addEventListener('scroll', this.onScroll). However, scrolling down the buefy b-dropdown component triggered no scroll event.
How should I detect whether a scroll is happening or not?
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I'm using a webview to show a html content, this html have links. I put a TouchableWithoutFeedback to open a link, I tried to emulated the button action of android so I put this button with position absolute. my problem is that when the button is above a link and I touch the button, react native open the link in the webview and the link in my button, I try to put TouchableWithoutFeedback inside a view to use onTouchStart and onTouchEnd with stopPropagation, but this doesn't work, Do you know a ways to stop propagation in these cases?
I tried with pointerEvents="none" in a view with the webview but this cancel all the links, as could be expected.
I tried to change pointerEvents to none in an onTouchStart and after change pointerEvents to auto in a onTouchEnd in a view with my TouchableWithoutFeedback, but it doesn't work.
Thanks for your help!
I am trying to use either ScrollView or FlatList to build a swipable carousel. At one step in the swiper, I want to be able to disable scrolling to the next item until another step is completed, but still enable the user to scroll back to the previous screen. How can I disable swiping in a single direction (left/right) while still allowing swipe in the other direction? I have tried to use onMomentumScrollBegin and onScroll to detect direction and then disable scrolling via the scrollEnabled prop, but it is not immediate and causes glitchy behavior
I'm attempting to create a custom NavBar on a screen that renders a ScrollView. Inside the NavBar, there's a button, that when pressed, causes the NavBar to translate downwards, thereby giving the appearance that the NavBar is expanding (This is done using Animated.spring() with the useNativeDriver option). Everything is working great, except if the ScrollView is still scrolling at the time the button is tapped (ie: when "momentum" scroll is taking place). In this scenario, the onPress handler that kicks off the NavBar animation is invoked as expected, but calls to Animated.spring() do not cause any animation to take place. Is it possible to either have the NavBar "expansion" animation to occur during the scroll, or pause the scroll to allow animation to proceed?
Like it's explained in RN docs the animation type you using are stoped by gesture events like scrolling, better use Animated.event() with onScrollprops combined with an interpolation animation to animate you footer.
I would like to create a carousel that scrolls automatically until the user scrolls / touches the ScrollView itself.
The auto-scrolling itself works fine with using scrollView.scrollTo but how could I detect if the user is interacting with the ScrollView? I took a look at the onScroll event but this does not seem to distinct between a user generated event and an event that was generated by calling scrollTo.
Also I'd like to know if it is possible to get the current scroll position from the ScrollView directly instead of reading it everytime from the onScroll event.
I'm very thankful for any tips and suggestions.
By digging into ScrollView's source code you can notice a few undocumented callbacks that will help you achieve what you're after, namely onTouchStart and onTouchEnd. These two callbacks are triggered only when user interacts with the ScrollView and not when you scroll programmatically.
You will probably want to clear your auto-scroll interval on onTouchStart and restart it after a delay on onTouchEnd.
Regarding your next question, the answer is no. As far as I know, no getter is currently exposed to retrieve the current scroll position. Therefore, you need to rely on the event passed to onScroll, retrieve event.nativeEvent.contentOffset['x' or 'y'], and store it in your component's state.
Note that if you're doing some heavy animations that need to follow scroll position closely (e.g. animated header or parallax image), it would be a good idea to use the native driver for Animated.event. You can learn more about it on React Native's blog.
I want to control the scrolling direction: disable to swipe left, enable to swipe right with scrollView.
I see the prop named: scrollEnabled , but it must be declare at the beginning.
How do i disable scrolling whenever i want?
This question is related to changing prop.
In iOS, i can control the scrolling behaviour easily.