EasyRefreshSliverLoadControl class

A sliver widget implementing the iOS-style pull to refresh content control.

When inserted as the first sliver in a scroll view or behind other slivers that still lets the scrollable overscroll in front of this sliver (such as the CupertinoSliverNavigationBar, this widget will:

• Let the user draw inside the overscrolled area via the passed in builder.
• Trigger the provided onLoad function when overscrolled far enough to pass loadTriggerPullDistance.
• Continue to hold loadIndicatorExtent amount of space for the builder to keep drawing inside of as the Future returned by onLoad processes.
• Scroll away once the onLoad Future completes.

The builder function will be informed of the current LoadMode when invoking it, except in the LoadMode.inactive state when no space is available and nothing needs to be built. The builder function will otherwise be continuously invoked as the amount of space available changes from overscroll, as the sliver scrolls away after the onLoad task is done, etc.

Only one refresh can be triggered until the previous refresh has completed and the indicator sliver has retracted at least 90% of the way back.

Can only be used in downward-scrolling vertical lists that overscrolls. In other words, refreshes can't be triggered with lists using ClampingScrollPhysics.

In a typical application, this sliver should be inserted between the app bar sliver such as CupertinoSliverNavigationBar and your main scrollable content's sliver.

See also:

• CustomScrollView, a typical sliver holding scroll view this control should go into.
• developer.apple.com/ios/human-interface-guidelines/controls/refresh-content-controls/
• RefreshIndicator, a Material Design version of the pull-to-refresh paradigm. This widget works differently than RefreshIndicator because instead of being an overlay on top of the scrollable, the EasyRefreshSliverLoadControl is part of the scrollable and actively occupies scrollable space.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• EasyRefreshSliverLoadControl

Constructors

EasyRefreshSliverLoadControl({Key? key, double loadTriggerPullDistance = _defaultLoadTriggerPullDistance, double loadIndicatorExtent = _defaultLoadIndicatorExtent, required LoadControlBuilder builder, Duration? completeDuration, OnLoadCallback? onLoad, required ValueNotifier<bool> focusNotifier, required ValueNotifier<TaskState> taskNotifier, required ValueNotifier<bool> callLoadNotifier, required bool taskIndependence, required ValueNotifier<double> extraExtentNotifier, required BindLoadIndicator bindLoadIndicator, bool enableControlFinishLoad = false, bool enableInfiniteLoad = true, bool enableHapticFeedback = false, bool footerFloat = false, bool safeArea = false, EdgeInsets? padding})

Create a new refresh control for inserting into a list of slivers.

const

Properties

bindLoadIndicator → BindLoadIndicator

绑定加载指示器

final

builder → LoadControlBuilder

A builder that's called as this sliver's size changes, and as the state changes.

final

callLoadNotifier → ValueNotifier<bool>

触发加载状态

final

completeDuration → Duration?

完成延时

final

enableControlFinishLoad → bool

是否开启控制结束

final

enableHapticFeedback → bool

开启震动反馈

final

enableInfiniteLoad → bool

是否开启无限加载

final

extraExtentNotifier → ValueNotifier<double>

列表未占满时多余长度

final

focusNotifier → ValueNotifier<bool>

滚动状态

final

footerFloat → bool

Footer浮动

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

loadIndicatorExtent → double

The amount of space the refresh indicator sliver will keep holding while onLoad's Future is still running.

final

loadTriggerPullDistance → double

The amount of overscroll the scrollable must be dragged to trigger a reload.

final

onLoad → OnLoadCallback?

Callback invoked when pulled by loadTriggerPullDistance.

final

padding → EdgeInsets?

内边距(根据布局合理使用，设置后safeArea无效)

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

safeArea → bool

安全区域

final

taskIndependence → bool

是否任务独立

final

taskNotifier → ValueNotifier<TaskState>

任务状态

final

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → _EasyRefreshSliverLoadControlState

Retrieve the current state of the EasyRefreshSliverLoadControl. The same as the state that gets passed into the builder function. Used for testing.

override

debugDescribeChildren() → List<DiagnosticsNode>

Returns a list of DiagnosticsNode objects describing this node's children.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode

Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.

inherited

toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String

A string representation of this object.

inherited

toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String

Returns a string representation of this node and its descendants.

inherited

toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a one-line detailed description of the object.

inherited

toStringShort() → String

A short, textual description of this widget.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited