SliverGridLayout class abstract
The size and position of all the tiles in a RenderSliverGrid.
Rather that providing a grid with a SliverGridLayout directly, the grid is provided a SliverGridDelegate, which computes a SliverGridLayout given a set of SliverConstraints. This allows the algorithm to dynamically respond to changes in the environment (e.g. the user rotating the device).
The tiles can be placed arbitrarily, but it is more efficient to place tiles roughly in order by scroll offset because grids reify a contiguous sequence of children.
This example shows how to construct a custom SliverGridLayout to lay tiles
in a grid form with some cells stretched to fit the entire width of the
grid (sometimes called "hero tiles").
link
To create a local project with this code sample, run:
flutter create --sample=rendering.SliverGridLayout.1 mysample
See also:
- SliverGridRegularTileLayout, which represents a layout that uses equally sized and spaced tiles.
- SliverGridGeometry, which represents the size and position of a single tile in a grid.
- SliverGridDelegate.getLayout, which returns this object to describe the delegate's layout.
- RenderSliverGrid, which uses this class during its RenderSliverGrid.performLayout method.
- Implementers
- Annotations
Constructors
- SliverGridLayout()
-
Abstract const constructor. This constructor enables subclasses to provide
const constructors so that they can be used in const expressions.
const
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
computeMaxScrollOffset(
int childCount) → double -
The scroll extent needed to fully display all the tiles if there are
childCountchildren in total. -
getGeometryForChildIndex(
int index) → SliverGridGeometry - The size and position of the child with the given index.
-
getMaxChildIndexForScrollOffset(
double scrollOffset) → int - The maximum child index that intersects with (or is before) this scroll offset.
-
getMinChildIndexForScrollOffset(
double scrollOffset) → int - The minimum child index that intersects with (or is after) this scroll offset.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited