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="M21.75 17C21.75 19.6234 19.6234 21.75 17 21.75H7C4.37665 21.75 2.25 19.6234 2.25 17V7C2.25 4.37665 4.37665 2.25 7 2.25H17C19.6234 2.25 21.75 4.37665 21.75 7V17ZM6.66475 16.6707C6.29427 16.4854 6.1441 16.0349 6.32934 15.6644L8.16164 11.9998L6.32934 8.33525C6.1441 7.96476 6.29427 7.51426 6.66475 7.32902C7.03524 7.14377 7.48574 7.29394 7.67098 7.66443L9.00016 10.3228L10.3293 7.66443C10.5146 7.29394 10.9651 7.14377 11.3356 7.32902C11.7061 7.51426 11.8562 7.96476 11.671 8.33525L9.83869 11.9998L11.671 15.6644C11.8562 16.0349 11.7061 16.4854 11.3356 16.6707C10.9651 16.8559 10.5146 16.7057 10.3293 16.3352L9.00016 13.6769L7.67098 16.3352C7.48574 16.7057 7.03524 16.8559 6.66475 16.6707ZM15 12.75H16.25V15.25H15C14.3096 15.25 13.75 14.6904 13.75 14C13.75 13.3096 14.3096 12.75 15 12.75ZM15 16.75C13.4812 16.75 12.25 15.5188 12.25 14C12.25 12.4812 13.4812 11.25 15 11.25H16.25V9C16.25 8.58579 16.5858 8.25 17 8.25C17.4142 8.25 17.75 8.58579 17.75 9V15.4C17.75 16.1456 17.1456 16.75 16.4 16.75H15Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );