SliverViewObserver class
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- SliverViewObserver
Constructors
-
SliverViewObserver({Key? key, required Widget child, SliverObserverController? controller, @Deprecated('It will be removed in version 2, please use [sliverContexts] instead') List<
BuildContext> sliverListContexts()?, List<BuildContext> sliverContexts()?, dynamic onObserveAll(Map<BuildContext, ObserveModel> )?, dynamic onObserve(ObserveModel)?, dynamic onObserveViewport(SliverViewportObserveModel)?, double leadingOffset = 0, double dynamicLeadingOffset()?, double? customOverlap(BuildContext sliverContext)?, double toNextOverPercent = 1, List<ObserverAutoTriggerObserveType> ? autoTriggerObserveTypes, ObserverTriggerOnObserveType triggerOnObserveType = ObserverTriggerOnObserveType.displayingItemsChange, ObserveModel? customHandleObserve(BuildContext context)?, ObserveModel? extendedHandleObserve(BuildContext context)?}) -
const
Properties
-
autoTriggerObserveTypes
→ List<
ObserverAutoTriggerObserveType> ? -
Used to set types those can trigger observe automatically.
finalinherited
- child → Widget
-
finalinherited
- controller → SliverObserverController?
-
final
- customHandleObserve → (ObserveModel? Function(BuildContext)?)
-
It allows you to customize observation logic when original logic doesn't
fit your needs.
finalinherited
- customOverlap → (double? Function(BuildContext sliverContext)?)
-
The callback that specifies a custom overlap corresponds to sliverContext.
final
- customTargetRenderSliverType → (bool Function(RenderObject?)?)
-
Used to find the target RenderSliver.
finalinherited
- dynamicLeadingOffset → (double Function()?)
-
Calculate offset dynamically
If this callback is implemented, the leadingOffset property will be
invalid.
finalinherited
- extendedHandleObserve → (ObserveModel? Function(BuildContext context)?)
-
It's used to handle the observation logic for other types of Sliver
besides RenderSliverList, RenderSliverFixedExtentList and
RenderSliverGrid.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- leadingOffset → double
-
Calculate offset.
finalinherited
- onObserve → (dynamic Function(ObserveModel)?)
-
The callback of getting observed result for first sliver.
finalinherited
-
onObserveAll
→ (dynamic Function(Map<
BuildContext, ObserveModel> )?) -
The callback of getting observed result map.
finalinherited
- onObserveViewport → (dynamic Function(SliverViewportObserveModel)?)
-
The callback of getting all slivers those are displayed in viewport.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
sliverContexts
→ (List<
BuildContext> Function()?) -
The callback of getting all sliver's buildContext.
finalinherited
- sliverController → SliverObserverController?
-
An object that can be used to dispatch a ListViewOnceObserveNotification
or GridViewOnceObserveNotification.
finalinherited
- toNextOverPercent → double
-
After the internal logic figure out the first child widget, if the
proportion of the size of the child widget blocked to its own size exceeds
the value toNextOverPercent, the next child widget will be the first
child widget.
finalinherited
- triggerOnObserveType → ObserverTriggerOnObserveType
-
Used to set the prerequisite for triggering the onObserve callback.
finalinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< SliverViewObserver> - Creates the mutable state for this widget at a given location in the tree.
-
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}) → 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