Struct ScrollBehavior 

pub struct ScrollBehavior { /* private fields */ }

How the scrollables under it behave, from the platform it follows.

Two starting points, as in the reference: ScrollBehavior::new, the base, which follows default_target_platform, and ScrollBehavior::material, the one an application installs, which follows Theme::platform. Each can be changed with the with_ methods, the reference’s copyWith: a behaviour with its scrollbars or its overscroll indicator turned off, with physics of its own, or following another platform.

The answers, platform by platform, are the reference’s:

	physics	scrollbars	overscroll	fling
Android	clamping	none	stretch (base: glow)	regression
Fuchsia	clamping	none	glow	regression
iOS	bouncing	none	none	recent average
macOS	bouncing, fast	shown	none	recent average, desktop
Linux, Windows	clamping	shown	none	regression

Implementations

impl ScrollBehavior

pub const fn new() -> Self

The base behaviour: it follows the platform the application runs on (default_target_platform), and shows a glow past the edge on Android and Fuchsia. What ScrollConfiguration::of answers where nothing was installed.

pub const fn material() -> Self

The application’s behaviour: it follows the theme’s platform (Theme::platform), and stretches the content past the edge on Android. What an application installs unless it says otherwise (Application::scroll_behavior).

pub const fn with_scrollbars(self, scrollbars: bool) -> Self

The same behaviour, with its scrollbars on or off. Off, none is drawn on any platform; on, the platform decides.

pub const fn with_overscroll(self, overscroll: bool) -> Self

The same behaviour, with its overscroll indicator on or off. Off, nothing is shown past an edge on any platform; on, the platform decides.

pub const fn with_physics(self, physics: ScrollPhysics) -> Self

The same behaviour, with these physics on every platform.

pub const fn with_platform(self, platform: TargetPlatform) -> Self

The same behaviour, following platform instead of the one it would have followed.

pub fn platform(&self, theme: &Theme) -> TargetPlatform

The platform this behaviour follows under theme: the one it was given, else the theme’s for the application’s behaviour, else the one the application runs on.

pub fn scroll_physics(&self, theme: &Theme) -> ScrollPhysics

The physics a scrollable under this behaviour starts from: bouncing on iOS, bouncing with a faster stop on macOS, clamping elsewhere — unless the behaviour was given its own. A scrollable’s own physics take precedence over these.

pub fn scrollbars(&self, theme: &Theme) -> Scrollbars

Whether a vertical scrollable under this behaviour draws a scrollbar: on Linux, macOS and Windows, where a pointer needs one to find its way; not on a touch screen, where a finger already knows where it is on the page.

pub fn overscroll_indicator(&self, theme: &Theme) -> Option<OverscrollIndicator>

What a scrollable under this behaviour shows when it is pulled past an edge it will not move beyond, or None for nothing: the stretch on Android under the application’s behaviour, a glow on Android under the base one and on Fuchsia under both, nothing on iOS, Linux, macOS and Windows.

pub fn velocity_tracker(&self, theme: &Theme) -> VelocityTracker

How a fling under this behaviour is read from the finger’s last moves: a weighted average of the most recent on iOS and macOS (each with its own weights), a fitted curve elsewhere.

Trait Implementations

impl Clone for ScrollBehavior

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ScrollBehavior

impl Debug for ScrollBehavior

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ScrollBehavior

fn default() -> Self

The base behaviour, ScrollBehavior::new.

impl Eq for ScrollBehavior

impl Hash for ScrollBehavior

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ScrollBehavior

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScrollBehavior