React NativeScrollView #
Component that wraps platform ScrollView while providing integration with touch locking "responder" system.
Keep in mind that ScrollViews must have a bounded height in order to work,
since they contain unbounded-height children into a bounded container (via
a scroll interaction). In order to bound the height of a ScrollView, either
set the height of the view directly (discouraged) or make sure all parent
views have bounded height. Forgetting to transfer {flex: 1} down the
view stack can lead to errors here, which the element inspector makes
easy to debug.
Doesn't yet support other contained responders from blocking this scroll view from becoming the responder.
<ScrollView> vs <ListView> - which one to use?
ScrollView simply renders all its react child components at once. That
makes it very easy to understand and use.
On the other hand, this has a performance downside. Imagine you have a very
long list of items you want to display, worth of couple of your ScrollView’s
heights. Creating JS components and native views upfront for all its items,
which may not even be shown, will contribute to slow rendering of your
screen and increased memory usage.
This is where ListView comes into play. ListView renders items lazily, just when they are about to appear. This laziness comes at cost of a more complicated API, which is worth it unless you are rendering a small fixed set of items.
Props #
contentContainerStyle StyleSheetPropType(ViewStylePropTypes) #
These styles will be applied to the scroll view content container which wraps all of the child views. Example:
return ( <ScrollView contentContainerStyle={styles.contentContainer}> </ScrollView> ); ... const styles = StyleSheet.create({ contentContainer: { paddingVertical: 20 } });
horizontal bool #
When true, the scroll view's children are arranged horizontally in a row instead of vertically in a column. The default value is false.
keyboardDismissMode enum('none', 'interactive', 'on-drag') #
Determines whether the keyboard gets dismissed in response to a drag. - 'none' (the default), drags do not dismiss the keyboard. - 'on-drag', the keyboard is dismissed when a drag begins. - 'interactive', the keyboard is dismissed interactively with the drag and moves in synchrony with the touch; dragging upwards cancels the dismissal. On android this is not supported and it will have the same behavior as 'none'.
keyboardShouldPersistTaps enum('always', 'never', 'handled', false, true) #
Determines when the keyboard should stay visible after a tap.
- 'never' (the default), tapping outside of the focused text input when the keyboard is up dismisses the keyboard. When this happens, children won't receive the tap.
- 'always', the keyboard will not dismiss automatically, and the scroll view will not catch taps, but children of the scroll view can catch taps.
- 'handled', the keyboard will not dismiss automatically when the tap was handled by a children, (or captured by an ancestor).
- false, deprecated, use 'never' instead
- true, deprecated, use 'always' instead
onContentSizeChange function #
Called when scrollable content view of the ScrollView changes.
Handler function is passed the content width and content height as parameters: (contentWidth, contentHeight)
It's implemented using onLayout handler attached to the content container which this ScrollView renders.
onScroll function #
Fires at most once per frame during scrolling. The frequency of the
events can be controlled using the scrollEventThrottle prop.
pagingEnabled bool #
When true, the scroll view stops on multiples of the scroll view's size when scrolling. This can be used for horizontal pagination. The default value is false.
refreshControl element #
A RefreshControl component, used to provide pull-to-refresh functionality for the ScrollView.
See RefreshControl.
removeClippedSubviews bool #
Experimental: When true, offscreen child views (whose overflow value is
hidden) are removed from their native backing superview when offscreen.
This can improve scrolling performance on long lists. The default value is
true.
scrollEnabled bool #
When false, the content does not scroll. The default value is true.
showsHorizontalScrollIndicator bool #
When true, shows a horizontal scroll indicator. The default value is true.
showsVerticalScrollIndicator bool #
When true, shows a vertical scroll indicator. The default value is true.
style style #
backfaceVisibility enum('visible', 'hidden')
backgroundColor color
borderBottomColor color
borderBottomLeftRadius number
borderBottomRightRadius number
borderBottomWidth number
borderColor color
borderLeftColor color
borderLeftWidth number
borderRadius number
borderRightColor color
borderRightWidth number
borderStyle enum('solid', 'dotted', 'dashed')
borderTopColor color
borderTopLeftRadius number
borderTopRightRadius number
borderTopWidth number
borderWidth number
opacity number
androidelevation number (Android-only) Sets the elevation of a view, using Android's underlying
elevation API.
This adds a drop shadow to the item and affects z-order for overlapping views.
Only supported on Android 5.0+, has no effect on earlier versions.
(Android-only) Sets the elevation of a view, using Android's underlying elevation API. This adds a drop shadow to the item and affects z-order for overlapping views. Only supported on Android 5.0+, has no effect on earlier versions.
androidendFillColor color #
Sometimes a scrollview takes up more space than its content fills. When this is the case, this prop will fill the rest of the scrollview with a color to avoid setting a background and creating unnecessary overdraw. This is an advanced optimization that is not needed in the general case.
androidscrollPerfTag string #
Tag used to log scroll performance on this scroll view. Will force momentum events to be turned on (see sendMomentumEvents). This doesn't do anything out of the box and you need to implement a custom native FpsListener for it to be useful.
iosalwaysBounceHorizontal bool #
When true, the scroll view bounces horizontally when it reaches the end
even if the content is smaller than the scroll view itself. The default
value is true when horizontal={true} and false otherwise.
iosalwaysBounceVertical bool #
When true, the scroll view bounces vertically when it reaches the end
even if the content is smaller than the scroll view itself. The default
value is false when horizontal={true} and true otherwise.
iosautomaticallyAdjustContentInsets bool #
Controls whether iOS should automatically adjust the content inset for scroll views that are placed behind a navigation bar or tab bar/ toolbar. The default value is true.
iosbounces bool #
When true, the scroll view bounces when it reaches the end of the
content if the content is larger then the scroll view along the axis of
the scroll direction. When false, it disables all bouncing even if
the alwaysBounce* props are true. The default value is true.
iosbouncesZoom bool #
When true, gestures can drive zoom past min/max and the zoom will animate to the min/max value at gesture end, otherwise the zoom will not exceed the limits.
ioscanCancelContentTouches bool #
When false, once tracking starts, won't try to drag if the touch moves. The default value is true.
ioscenterContent bool #
When true, the scroll view automatically centers the content when the content is smaller than the scroll view bounds; when the content is larger than the scroll view, this property has no effect. The default value is false.
ioscontentInset {top: number, left: number, bottom: number, right: number} #
The amount by which the scroll view content is inset from the edges
of the scroll view. Defaults to {top: 0, left: 0, bottom: 0, right: 0}.
ioscontentOffset PointPropType #
Used to manually set the starting scroll offset.
The default value is {x: 0, y: 0}.
iosdecelerationRate enum('fast', 'normal'), number #
A floating-point number that determines how quickly the scroll view
decelerates after the user lifts their finger. You may also use string
shortcuts "normal" and "fast" which match the underlying iOS settings
for UIScrollViewDecelerationRateNormal and
UIScrollViewDecelerationRateFast respectively.
- normal: 0.998 (the default)
- fast: 0.99
iosdirectionalLockEnabled bool #
When true, the ScrollView will try to lock to only vertical or horizontal scrolling while dragging. The default value is false.
iosindicatorStyle enum('default', 'black', 'white') #
The style of the scroll indicators.
- default (the default), same as black.
- black, scroll indicator is black. This style is good against a white content background.
- white, scroll indicator is white. This style is good against a black content background.
iosmaximumZoomScale number #
The maximum allowed zoom scale. The default value is 1.0.
iosminimumZoomScale number #
The minimum allowed zoom scale. The default value is 1.0.
iosonScrollAnimationEnd function #
Called when a scrolling animation ends.
iosscrollEventThrottle number #
This controls how often the scroll event will be fired while scrolling (as a time interval in ms). A lower number yields better accuracy for code that is tracking the scroll position, but can lead to scroll performance problems due to the volume of information being send over the bridge. You will not notice a difference between values set between 1-16 as the JS run loop is synced to the screen refresh rate. If you do not need precise scroll position tracking, set this value higher to limit the information being sent across the bridge. The default value is zero, which results in the scroll event being sent only once each time the view is scrolled.
iosscrollIndicatorInsets {top: number, left: number, bottom: number, right: number} #
The amount by which the scroll view indicators are inset from the edges
of the scroll view. This should normally be set to the same value as
the contentInset. Defaults to {0, 0, 0, 0}.
iosscrollsToTop bool #
When true, the scroll view scrolls to top when the status bar is tapped. The default value is true.
iossnapToAlignment enum('start', 'center', 'end') #
When snapToInterval is set, snapToAlignment will define the relationship
of the snapping to the scroll view.
- start (the default) will align the snap at the left (horizontal) or top (vertical)
- center will align the snap in the center
- end will align the snap at the right (horizontal) or bottom (vertical)
iossnapToInterval number #
When set, causes the scroll view to stop at multiples of the value of
snapToInterval. This can be used for paginating through children
that have lengths smaller than the scroll view. Used in combination
with snapToAlignment.
iosstickyHeaderIndices [number] #
An array of child indices determining which children get docked to the
top of the screen when scrolling. For example, passing
stickyHeaderIndices={[0]} will cause the first child to be fixed to the
top of the scroll view. This property is not supported in conjunction
with horizontal={true}.
ioszoomScale number #
The current scale of the scroll view content. The default value is 1.0.
Methods #
scrollTo(y?, x?, animated?) #
Scrolls to a given x, y offset, either immediately or with a smooth animation.
Example:
scrollTo({x: 0; y: 0; animated: true})
Note: The weird function signature is due to the fact that, for historical reasons, the function also accepts separate arguments as as alternative to the options object. This is deprecated due to ambiguity (y before x), and SHOULD NOT BE USED.
scrollToEnd(options?) #
If this is a vertical ScrollView scrolls to the bottom. If this is a horizontal ScrollView scrolls to the right.
Use scrollToEnd({animated: true}) for smooth animated scrolling,
scrollToEnd({animated: false}) for immediate scrolling.
If no options are passed, animated defaults to true.
scrollWithoutAnimationTo(y, x) #
Deprecated, use scrollTo instead.
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Examples # | Edit on GitHub |
