KLineScrollMetrics class

用户滚动时传给 delegate 的滚动位置信息。

core 只负责把 ScrollView 的当前位置和边界透出；业务方可根据 pixels、 minScrollExtent、maxScrollExtent 自行判断左侧或右侧阈值，例如距离右侧 20px 时加载最新数据，或接近左侧时加载更旧数据。

Annotations

• @immutable

Constructors

KLineScrollMetrics({required double pixels, required double minScrollExtent, required double maxScrollExtent, required double viewportDimension, required double scrollDelta, required double extentBefore, required double extentAfter})

const

Properties

extentAfter → double

当前位置右侧还剩余的距离。

final

extentBefore → double

当前位置左侧已经滚过的距离。

final

hashCode → int

The hash code for this object.

no setter, inherited

maxScrollExtent → double

最大可滚动位置，也就是内容最右侧。

final

minScrollExtent → double

最小可滚动位置，通常为 0。

final

pixels → double

当前横向滚动偏移量。

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

scrollDelta → double

本次滚动更新相对上一帧的偏移变化。

final

viewportDimension → double

当前视口宽度。

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited