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" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M1.25 12C1.25 6.06294 6.06294 1.25 12 1.25C17.937 1.25 22.75 6.06293 22.75 12C22.75 17.937 17.937 22.75 12 22.75C10.1437 22.75 8.39536 22.2788 6.87016 21.4493L2.63727 22.2373C2.39422 22.2826 2.14448 22.2051 1.96967 22.0303C1.79485 21.8555 1.71742 21.6058 1.76267 21.3627L2.55076 17.1298C1.72113 15.6046 1.25 13.8563 1.25 12ZM12 7.25C12.4142 7.25 12.75 7.58579 12.75 8V12C12.75 12.4142 12.4142 12.75 12 12.75C11.5858 12.75 11.25 12.4142 11.25 12V8C11.25 7.58579 11.5858 7.25 12 7.25ZM12.5672 16.501C12.8445 16.1933 12.8198 15.7191 12.512 15.4418C12.2043 15.1646 11.73 15.1893 11.4528 15.497L11.4428 15.5081C11.1655 15.8159 11.1902 16.2901 11.498 16.5673C11.8057 16.8446 12.28 16.8199 12.5572 16.5121L12.5672 16.501Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );