SliverWaterfallFlowDelegate class abstract

create by zmtzawqlp on 2019/11/9

Controls the masonry layout of tiles.

Given the current constraints on the grid, a SliverGridDelegate computes the masonry layout for the tiles in the grid. The tiles can be placed as masonry layout with equally cross-axis sized and spaced. A contiguous sequence of children are laid out after the shortest one of the previous row/column。

See also:

Inheritance

Constructors

SliverWaterfallFlowDelegate({double mainAxisSpacing = 0.0, double crossAxisSpacing = 0.0, LastChildLayoutTypeBuilder? lastChildLayoutTypeBuilder, CollectGarbage? collectGarbage, ViewportBuilder? viewportBuilder, bool closeToTrailing = false})
Creates a delegate that makes masonry layout with tiles in the cross axis.
const

Properties

closeToTrailing bool
when reverse property of List is true, layout is as following. it likes chat list, and new session will insert to zero index but it's not right when items are not full of viewport.
finalinherited
collectGarbage CollectGarbage?
Call when collect garbage, return indexes of children which are disposed to collect
finalinherited
crossAxisSpacing double
The number of logical pixels between each child along the cross axis.
final
hashCode int
The hash code for this object.
no setterinherited
lastChildLayoutTypeBuilder LastChildLayoutTypeBuilder?
The builder to get layout type of last child Notice: it should only for last child
finalinherited
mainAxisSpacing double
The number of logical pixels between each child along the main axis.
final
runtimeType Type
A representation of the runtime type of the object.
no setterinherited
viewportBuilder ViewportBuilder?
The builder to get indexes in viewport
finalinherited

Methods

getChildUsableCrossAxisExtent(SliverConstraints constraints) double
Return usable cross-axis extent of each child.
getCrossAxisCount(SliverConstraints constraints) int
Return crossAxisCount by SliverWaterfallFlowDelegateWithFixedCrossAxisCount and SliverWaterfallFlowDelegateWithMaxCrossAxisExtent.
getCrossAxisOffset(SliverConstraints constraints, int? crossAxisIndex) double
Return the offset of the child in the non-scrolling axis.
getLastChildLayoutType(int index) LastChildLayoutType
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
shouldRelayout(SliverWaterfallFlowDelegate oldDelegate) bool
Return true when the children need to be laid out.
toString() String
A string representation of this object.
inherited

Operators

operator ==(Object other) bool
The equality operator.
inherited