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="M9 24C9 15.7157 15.7157 9 24 9C32.2843 9 39 15.7157 39 24C39 32.2843 32.2843 39 24 39C15.7157 39 9 32.2843 9 24ZM24 11C16.8203 11 11 16.8203 11 24C11 31.1797 16.8203 37 24 37C31.1797 37 37 31.1797 37 24C37 16.8203 31.1797 11 24 11ZM24 15C19.0294 15 15 19.0294 15 24C15 28.9706 19.0294 33 24 33C28.9706 33 33 28.9706 33 24C33 19.0294 28.9706 15 24 15ZM13 24C13 17.9249 17.9249 13 24 13C30.0751 13 35 17.9249 35 24C35 30.0751 30.0751 35 24 35C17.9249 35 13 30.0751 13 24Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );