NZBackToTop class
NZBackToTop 当用户向下滚动时出现的按钮，允许用户快速滚动回顶部。
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- NZBackToTop
Constructors
- NZBackToTop({Key? key, required ScrollController scrollController, double threshold = 300.0, Widget? child, Duration duration = const Duration(milliseconds: 500), Curve curve = Curves.easeInOut, EdgeInsets padding = const EdgeInsets.all(16.0)})
-
const
Properties
- child → Widget?
-
子组件 (通常是一个图标)
final
- curve → Curve
-
滚动动画的曲线
final
- duration → Duration
-
滚动动画的持续时间
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- padding → EdgeInsets
-
距离屏幕边缘的内边距
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- scrollController → ScrollController
-
监听和控制的滚动控制器
final
- threshold → double
-
按钮出现前距离顶部的阈值距离
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< NZBackToTop> -
Creates the mutable state for this widget at a given location in the tree.
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