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="M24 4C12.9543 4 4 12.9543 4 24C4 35.0457 12.9543 44 24 44C35.0457 44 44 35.0457 44 24C44 12.9543 35.0457 4 24 4ZM23 6.02731C13.524 6.54619 6 14.3944 6 24C6 28.6107 7.73359 32.8166 10.5845 36.0013L23 23.5858V6.02731ZM23 41.9727C18.7825 41.7417 14.9516 40.0589 11.9987 37.4155L23 26.4142V41.9727ZM25 6.02731V23.5858L37.4155 36.0013C40.2664 32.8166 42 28.6107 42 24C42 14.3944 34.476 6.54619 25 6.02731ZM36.0013 37.4155L25 26.4142V41.9727C29.2175 41.7417 33.0484 40.0589 36.0013 37.4155Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );