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Layout widgets

发布于 2019-12-09 21:31:25 字数 49438 浏览 1149 评论 0 收藏 0

Arrange other widgets columns, rows, grids, and many other layouts.

See more widgets in the widget catalog.

Single-child layout widgets

Container

A convenience widget that combines common painting, positioning, and sizing widgets.

Documentation
Padding

A widget that insets its child by the given padding.

Documentation
Center

A widget that centers its child within itself.

Documentation
Align

A widget that aligns its child within itself and optionally sizes itself based on the child's size.

Documentation
FittedBox

Scales and positions its child within itself according to fit.

Documentation
AspectRatio

A widget that attempts to size the child to a specific aspect ratio.

Documentation
ConstrainedBox

A widget that imposes additional constraints on its child.

Documentation Abc
Baseline

A widget that positions its child according to the child's baseline.

Documentation
FractionallySizedBox

A widget that sizes its child to a fraction of the total available space. For more details about the layout algorithm, see RenderFractionallySizedOverflowBox.

Documentation
IntrinsicHeight

A widget that sizes its child to the child's intrinsic height.

Documentation
IntrinsicWidth

A widget that sizes its child to the child's intrinsic width.

Documentation
LimitedBox

A box that limits its size only when it's unconstrained.

Documentation
Offstage

A widget that lays the child out as if it was in the tree, but without painting anything, without making the child available for hit testing, and without taking any room in the parent.

Documentation
OverflowBox

A widget that imposes different constraints on its child than it gets from its parent, possibly allowing the child to overflow the parent.

Documentation
SizedBox

A box with a specified size. If given a child, this widget forces its child to have a specific width and/or height (assuming values are permitted by this widget's parent). If either the width or height is null, this widget will size itself to match the child's size in that dimension.

Documentation
SizedOverflowBox

A widget that is a specific size but passes its original constraints through to its child, which will probably overflow.

Documentation
Transform

A widget that applies a transformation before painting its child.

Documentation
CustomSingleChildLayout

A widget that defers the layout of its single child to a delegate.

Documentation

Multi-child layout widgets

Row

Layout a list of child widgets in the horizontal direction.

Documentation
Column

Layout a list of child widgets in the vertical direction.

Documentation
Stack

This class is useful if you want to overlap several children in a simple way, for example having some text and an image, overlaid with a gradient and a button attached to the bottom.

Documentation
IndexedStack

A Stack that shows a single child from a list of children.

Documentation
GridView

A grid list consists of a repeated pattern of cells arrayed in a vertical and horizontal layout. The GridView widget implements this component.

Documentation
Flow

A widget that implements the flow layout algorithm.

Documentation
Table

A widget that uses the table layout algorithm for its children.

Documentation
Wrap

A widget that displays its children in multiple horizontal or vertical runs.

Documentation
ListBody

A widget that arranges its children sequentially along a given axis, forcing them to the dimension of the parent in the other axis.

Documentation
CustomMultiChildLayout

A widget that uses a delegate to size and position multiple children.

Documentation
LayoutBuilder

Builds a widget tree that can depend on the parent widget's size.

Documentation
ListView

A scrollable, linear list of widgets. ListView is the most commonly used scrolling widget. It displays its children one after another in the scroll direction. In the cross axis, the children are required to fill the ListView.

Documentation
Expanded

A widget that expands a child of a Row, Column, or Flex.

Documentation

See more widgets in the widget catalog.

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