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="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M12 1.25C17.9371 1.25 22.75 6.06294 22.75 12C22.75 17.9371 17.9371 22.75 12 22.75C10.1409 22.75 8.39016 22.2775 6.86335 21.4455L2.12395 22.2397C1.88692 22.2794 1.6452 22.2031 1.47391 22.0345C1.30261 21.8659 1.2225 21.6255 1.25845 21.3878L2.05878 16.0977C1.53735 14.8339 1.25001 13.4496 1.25001 12C1.25001 6.06294 6.06295 1.25 12 1.25ZM7.94309 6.7002C7.20774 6.7002 6.599 7.32056 6.71374 8.08595C6.929 9.52188 7.56749 12.1676 9.46536 14.0799C11.4494 16.0789 14.2876 16.9343 15.8259 17.2715C16.6211 17.4459 17.3 16.8158 17.3 16.0387V14.2151C17.3 14.0909 17.2235 13.9796 17.1076 13.935L15.1475 13.1825C15.0949 13.1623 15.0377 13.1573 14.9824 13.1681L13.0048 13.5542C11.7304 12.894 10.958 12.1532 10.4942 11.0387L10.867 9.02365C10.8769 8.97021 10.8721 8.91508 10.8531 8.86416L10.1182 6.89529C10.0744 6.77797 9.96233 6.7002 9.83711 6.7002H7.94309Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );