GridBuilder<T> class

Draw a grid list with elements generated from builder given source.

With GridBuilder.count, it is possible to configure a grid by specifying the number of horizontal pieces in crossAxisCount.

GridBuilder.extent allows you to configure the grid by specifying the maximum horizontal width with maxCrossAxisExtent.

If listenWhenListenable is true, ListenableListener will be wrapped around each element if source inherits Listenable. Therefore, each element of source is monitored individually, and if any element is updated, only that element is updated in the drawing.

sourceを与えてbuilderから生成された要素でグリッドリストを描画します。

GridBuilder.countだとcrossAxisCountで横の個数を指定してグリッドを構成することが可能です。

GridBuilder.extentだとmaxCrossAxisExtentで横の最大幅を指定してグリッドを構成することができます。

listenWhenListenableがtrueになっている場合、sourceにListenableを継承している場合ListenableListenerが各要素にラップされます。 そのため、sourceの各要素をそれぞれ監視し、いずれかの要素が更新された場合その要素のみ描画が更新されます。

Inheritance

Constructors

GridBuilder.count({Key? key, Axis scrollDirection = Axis.vertical, bool reverse = false, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool shrinkWrap = false, EdgeInsetsGeometry? padding, required List<T> source, required int crossAxisCount, required Widget builder(BuildContext context, T item, int index), bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, bool listenWhenListenable = true, DragStartBehavior dragStartBehavior = DragStartBehavior.start, ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual, String? restorationId, Clip clipBehavior = Clip.hardEdge, double mainAxisSpacing = 0.0, double crossAxisSpacing = 0.0, double childAspectRatio = 1.0, double? mainAxisExtent})
Draw a grid list with elements generated from builder given source.
const
GridBuilder.extent({Key? key, Axis scrollDirection = Axis.vertical, bool reverse = false, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool shrinkWrap = false, EdgeInsetsGeometry? padding, required List<T> source, required double maxCrossAxisExtent, required Widget builder(BuildContext context, T item, int index), bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, bool listenWhenListenable = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior dragStartBehavior = DragStartBehavior.start, ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual, String? restorationId, Clip clipBehavior = Clip.hardEdge, double mainAxisSpacing = 0.0, double crossAxisSpacing = 0.0, double childAspectRatio = 1.0, double? mainAxisExtent})
Draw a grid list with elements generated from builder given source.
const

Properties

addAutomaticKeepAlives → bool
If this is set to true, it will prevent a rebuild if AutomaticKeepAliveClientMixin is mixdrunk in the Widget in the List and is shown or hidden in the List.
final
addRepaintBoundaries → bool
Set to true to provide a redraw area for the list (the part that is displayed on the screen).
final
addSemanticIndexes → bool
Automatically add semantics indexes.
final
builder → Widget Function(BuildContext context, T item, int index)
Builder for display on a grid.
final
cacheExtent → double?
Specify the area to hold the cache.
final
childAspectRatio → double
Aspect ratio of the child element.
final
clipBehavior → Clip
Specify here to adjust the clip function of the listing.
final
controller → ScrollController?
If you want to control scrolling from the outside, pass ScrollController.
final
crossAxisCount → int
Number of horizontal elements in the grid.
final
crossAxisSpacing → double
Space width between elements in the horizontal direction of the grid.
final
dragStartBehavior → DragStartBehavior
Provides the ability to initiate a drag.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
keyboardDismissBehavior → ScrollViewKeyboardDismissBehavior
Define here if you want to implement a mechanism to close the keyboard triggered by scrolling.
final
listenWhenListenable → bool
If listenWhenListenable is true, ListenableListener will be wrapped around each element if source inherits Listenable. Therefore, each element of source is monitored individually, and if any element is updated, only that element is updated in the drawing.
final
mainAxisExtent → double?
Specifies the width of the main element.
final
mainAxisSpacing → double
Space width between vertical elements of the grid.
final
maxCrossAxisExtent → double
Maximum width of the grid's horizontal elements.
final
padding → EdgeInsetsGeometry?
Grid view padding.
final
physics → ScrollPhysics?
Pass ScrollPhysics to set the scrolling method.
final
primary → bool?
If this is true, it is recognized as the primary scrolling view.
final
restorationId → String?
Restore ID to save and restore the scroll offset of the listing.
final
reverse → bool
If this is true, the scroll direction is reversed.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scrollDirection → Axis
Scroll direction.
final
semanticChildCount → int?
Explicitly communicate the number of child widgets.
final
shrinkWrap → bool
If this is true, the area for scrolling is reduced to only where the content resides.
final
source → List<T>
List of data to be displayed on the grid.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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