Summary:
Would like feedback from the community as this may not be the best solution for all
I would like to restrict (or paginate) the fling of a horizontal ScrollView when `snapToInterval` is set. This is not currently possible with `pagingEnabled`, since the pagination works only when items are the entire width of the ScrollView.
This implementation simply restricts the predicted `targetOffset` found from the `x` velocity and replaces it with the offset when the pan gesture ended.
To get pagination working, I may paginate based on the interval by calculating the offset delta from the beginning of the gesture to current offset and restricting the scrolling behavior to the `snapToInterval`. If this is preferred, I can update this PR or make a new one, but wanted to start a discussion since it seems like there are many in the community that would like this feature #21302 .
[General] [Added] - add prop `disableIntervalMomentum` to disable the predictive scrolling behavior of horizontal ScrollViews
Pull Request resolved: https://github.com/facebook/react-native/pull/24045
Differential Revision: D14939754
Pulled By: sahrens
fbshipit-source-id: 26be19c47dfb8eed4d7e6035df53a77451e23081
Summary:
ScrollView's scrollTo behavior on iOS was recently changed to limit the offset to the content size plus any content inset (see #23427). This departure from the old behavior created UI issues for anyone that is using the over-scroll ability for the purpose of positioning elements at specific coordinates on the screen. Examples include using this behavior to position TextInputs above the virtual keyboard programmatically when focused or moving drop down elements positioned near the bottom of the content toward the top of the screen when selected to show a larger absolutely positioned item list. Default behavior does not change and this is an "opt-in" type of prop to re-enable the old behavior.
[iOS] [Added] - Added scrollToOverflowEnabled prop to ScrollView
Pull Request resolved: https://github.com/facebook/react-native/pull/24296
Differential Revision: D14762619
Pulled By: cpojer
fbshipit-source-id: d2a552b5cb321d52e8ea4116327bf9ec647a3aae
Summary:
https://our.intern.facebook.com/intern/sandcastle/job/18014398585083744
```
xplat/js/react-native-github/React/Views/ScrollView/RCTScrollViewManager.m:38:20: warning: 'UIScrollViewContentInsetAdjustmentBehavior' is only available on iOS 11.0 or newer [-Wunguarded-availability-new]
```
Reviewed By: mattrobmattrob
Differential Revision: D14076127
fbshipit-source-id: 4050131c4f5211757383069567a2cf5382979735
Summary:
Motivation:
----------
This is one of the more sought after feature requests for RN:
react-native.canny.io/feature-requests/p/add-speed-attribute-to-scrollto
This PR adds the support to add a "duration" whenever using "scrollTo" or "scrollToEnd" with
a scrollView. Currently this only exists for Android as the iOS implementation will be somewhat more involved.
This PR is also backwards compatible and does not yet deprecate the "animated" boolean. It may not make sense to ever deprecate "animated", as it could be the flag that is used when devs want the system default duration (which is 250ms for Android). I'm not sure what it is for iOS. It would simplify things to remove "animated", though.
Pull Request resolved: https://github.com/facebook/react-native/pull/22884
Differential Revision: D13860038
Pulled By: cpojer
fbshipit-source-id: f06751d063a33d7046241c95348b6abbb327d36f
Summary:
This PR exposes the `onScrollToTop` event on iOS using the same event-forwarding infrastructure as other ScrollView events. (As such, its `nativeEvent` object reflects the same fields as other ScrollView events.)
Motivation:
----------
If your app is only interested in knowing the position of a ScrollView after a scroll has completed, it can use `onScrollEndDrag` and `onMomentumScrollEnd` to inspect the `contentOffset` after a drag-initiated scroll has finished. (This is much less expensive than observing the `onScroll` event if you only want to know the end position.) However, neither of these `End` events fire if the ScrollView is scrolled to the top by tapping the status bar.
By exposing `onScrollToTop`, it is now possible for an app to cheaply know when such a scroll has completed.
Pull Request resolved: https://github.com/facebook/react-native/pull/21204
Differential Revision: D9943618
Pulled By: hramos
fbshipit-source-id: ac5ee42b7f12d94655ffda617f8f811138da7f6f
Summary: This change drops the year from the copyright headers and the LICENSE file.
Reviewed By: yungsters
Differential Revision: D9727774
fbshipit-source-id: df4fc1e4390733fe774b1a160dd41b4a3d83302a
Summary: Added `snapToStart` and `snapToEnd` props to ScrollView which work together with `snapToOffsets` and determine whether the beginning and end of the list automatically count as snap offsets or not. If not, the list is allowed to free-scroll between its start/end and the first/last snap offset.
Reviewed By: sahrens
Differential Revision: D9442386
fbshipit-source-id: 47a5fdb20f884542434b01b1f0a486ed2b478c6e
Summary:
* Added snapToOffsets prop to ScrollView. Allows snapping at arbitrary points.
* Fixed pagingEnabled not being overridden by snapToInterval on iOS.
* Fixed Android *requiring* pagingEnabled to be defined alongside snapToInterval.
* Added support for decelerationRate on Android.
* Fixed snapping implementation. It was not calculating end position correctly at all (velocity is not a linear offset).
* Resolves https://github.com/facebook/react-native/issues/20155
* Added support for new content being added during scroll (mirrors existing functionality in vertical ScrollView).
* Added support for snapToInterval.
* Resolves https://github.com/facebook/react-native/issues/19552
Reviewed By: yungsters
Differential Revision: D9405703
fbshipit-source-id: b3c367b8079e6810794b0165dfdbcff4abff2eda
Summary:
Includes React Native and its dependencies Fresco, Metro, and Yoga. Excludes samples/examples/docs.
find: ^(?:( *)|( *(?:[\*~#]|::))( )? *)?Copyright (?:\(c\) )?(\d{4})\b.+Facebook[\s\S]+?BSD[\s\S]+?(?:this source tree|the same directory)\.$
replace: $1$2$3Copyright (c) $4-present, Facebook, Inc.\n$2\n$1$2$3This source code is licensed under the MIT license found in the\n$1$2$3LICENSE file in the root directory of this source tree.
Reviewed By: TheSavior, yungsters
Differential Revision: D7007050
fbshipit-source-id: 37dd6bf0ffec0923bfc99c260bb330683f35553e
Summary:
Builds off of https://github.com/facebook/react-native/commit/cae7179c9459f12b1cb5e1a1d998a9dc45f927dc
- Make the prop a dictionary for more configuration options
- Rename `maintainPositionAtOrBeyondIndex` -> `maintainVisibleContentPosition` + `minIndexForVisible`
- Add autoscroll threshold feature
Given the async native of RN JS and background layout, there is no way to trigger the scrollTo from JS without risking a delay, so we add the feature in native code.
== Test Plan ==
ScrollViewExample:
https://youtu.be/pmY8pxC9PRs
Reviewed By: shergin
Differential Revision: D6729160
fbshipit-source-id: 70f9bae460ce84567857a4f696da78ce9b3b834c
Summary:
== Problem / Background ==
Most lists paginate in a single direction (standard infinite list), but some paginate in both directions. Most common example is a chat thread where new messages show up on the bottom, and old content can be loaded by scrolling up. Comment threads are another example.
Right now, adding content to the bottom of a scroll view is smooth - the content doesn't jump. But when adding to the top of the scrollview, the content gets pushed down, which is jarring (note this may appear reversed because of inverting the list which is common for chat applications).
== Approach ==
The basic idea is simple - we set a flag in JS, then for every uimanager transaction, we record which is the first eligible and visible view in the ScrollView, and compare it's new origin to the old one. If it has changed, we update the contentOffset of the ScrollView to compensate.
This is done by observing `willPerformMounting` directly (only from scrollviews that have this new property set), and then observing the prev state with prependUIBlock and making the update synchronously in addUIBlock to avoid any flicker.
There is also a way to skip views that we don't care about, like a spinner at the top of the view that we don't want to stay in place - we actually want it to get pushed up by the new content, replaced visually in the viewport.
== Notes ==
Most chat applications will probably want to do a scrollToTop when new content comes in and the user is already scrolled at or near the bottom.
This is glitchy if visible children are re-ordered, which could be fixed with additional logic, but it doesn't come up in the type of applications we're targetting here so punting on that.
== Test Plan ==
https://youtu.be/4GcqDGz9eOE
Reviewed By: shergin
Differential Revision: D6696921
fbshipit-source-id: 822e7dfcb207006cd1ba098356324ea81f619428
Taylor123
Craig_Martin
Hoa Dinh
Kevin Gozali
Michał Osadnik
James Reggio
Héctor Ramos
Oleg Lokhvitsky
Sophie Alpert
Spencer Ahrens
Valentin Shergin