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="M38 24C38 31.732 31.732 38 24 38C16.268 38 10 31.732 10 24C10 16.268 16.268 10 24 10C31.732 10 38 16.268 38 24ZM40 24C40 32.8366 32.8366 40 24 40C15.1634 40 8 32.8366 8 24C8 15.1634 15.1634 8 24 8C32.8366 8 40 15.1634 40 24ZM31.2427 28.2426C28.8995 30.5858 25.1005 30.5858 22.7574 28.2426C20.4142 25.8995 20.4142 22.1005 22.7574 19.7574C25.1005 17.4142 28.8995 17.4142 31.2427 19.7574L32.6569 18.3431C29.5327 15.219 24.4674 15.219 21.3432 18.3431C18.219 21.4673 18.219 26.5327 21.3432 29.6569C24.4674 32.781 29.5327 32.781 32.6569 29.6569L31.2427 28.2426ZM15 21L15 31H17V21H15ZM17.5 18.5C17.5 19.3284 16.8284 20 16 20C15.1716 20 14.5 19.3284 14.5 18.5C14.5 17.6716 15.1716 17 16 17C16.8284 17 17.5 17.6716 17.5 18.5Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );