SliverWaterfallFlowDelegateWithFixedCrossAxisCount class
Creates masonry layouts with a fixed number of tiles in the cross axis.
For example, if the grid is vertical, this delegate will create a layout with a fixed number of columns. If the grid is horizontal, this delegate will create a layout with a fixed number of rows.
This delegate creates grids with equally cross-axis sized and spaced tiles.
See also:
- SliverWaterfallFlowDelegateWithMaxCrossAxisExtent, which creates a masonry layout that have a maximum cross-axis extent.
MasonryGridView, which uses this delegate to control the layout of its tiles.- SliverWaterfallFlow, which uses this delegate to control the layout of its tiles.
- RenderSliverWaterfallFlow, which uses this delegate to control the layout of its tiles.
- Inheritance
-
- Object
- ExtendedListDelegate
- SliverWaterfallFlowDelegate
- SliverWaterfallFlowDelegateWithFixedCrossAxisCount
Constructors
- SliverWaterfallFlowDelegateWithFixedCrossAxisCount({required int crossAxisCount, double mainAxisSpacing = 0.0, double crossAxisSpacing = 0.0, LastChildLayoutTypeBuilder? lastChildLayoutTypeBuilder, CollectGarbage? collectGarbage, ViewportBuilder? viewportBuilder, bool closeToTrailing = false})
-
Creates a delegate that makes masonry layouts with a fixed number of 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
- crossAxisCount → int
-
The number of children in the cross axis.
final
- crossAxisSpacing → double
-
The number of logical pixels between each child along the cross axis.
finalinherited
- 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.
finalinherited
- 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.
inherited
-
getCrossAxisCount(
SliverConstraints constraints) → int -
Return crossAxisCount by SliverWaterfallFlowDelegateWithFixedCrossAxisCount
and SliverWaterfallFlowDelegateWithMaxCrossAxisExtent.
override
-
getCrossAxisOffset(
SliverConstraints constraints, int? crossAxisIndex) → double -
Return the offset of the child in the non-scrolling axis.
inherited
-
getLastChildLayoutType(
int index) → LastChildLayoutType -
inherited
-
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.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited