build method

@override Widget build(BuildContext context)

Describes the part of the user interface represented by this widget.

The framework calls this method when this widget is inserted into the tree in a given BuildContext and when the dependencies of this widget change (e.g., an InheritedWidget referenced by this widget changes). This method can potentially be called in every frame and should not have any side effects beyond building a widget.

The framework replaces the subtree below this widget with the widget returned by this method, either by updating the existing subtree or by removing the subtree and inflating a new subtree, depending on whether the widget returned by this method can update the root of the existing subtree, as determined by calling Widget.canUpdate.

Typically implementations return a newly created constellation of widgets that are configured with information from this widget's constructor and from the given BuildContext.

The given BuildContext contains information about the location in the tree at which this widget is being built. For example, the context provides the set of inherited widgets for this location in the tree. A given widget might be built with multiple different BuildContext arguments over time if the widget is moved around the tree or if the widget is inserted into the tree in multiple places at once.

The implementation of this method must only depend on:

• the fields of the widget, which themselves must not change over time, and
• any ambient state obtained from the context using BuildContext.dependOnInheritedWidgetOfExactType.

If a widget's build method is to depend on anything else, use a StatefulWidget instead.

See also:

• StatelessWidget, which contains the discussion on performance considerations.

Implementation

@override
widgets.Widget build(widgets.BuildContext context) => SvgPicture.string(
      '''
<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M13 12C13 10.3431 14.3431 9 16 9L32 9C33.6569 9 35 10.3431 35 12C35 13.6569 33.6569 15 32 15H27L27 33H32C33.6569 33 35 34.3431 35 36C35 37.6569 33.6569 39 32 39H16C14.3431 39 13 37.6569 13 36C13 34.3431 14.3431 33 16 33H21L21 15L16 15C14.3431 15 13 13.6569 13 12ZM16 11C15.4477 11 15 11.4477 15 12C15 12.5523 15.4477 13 16 13L23 13L23 35H16C15.4477 35 15 35.4477 15 36C15 36.5523 15.4477 37 16 37H32C32.5523 37 33 36.5523 33 36C33 35.4477 32.5523 35 32 35H25L25 13H32C32.5523 13 33 12.5523 33 12C33 11.4477 32.5523 11 32 11L16 11Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );