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="M2.25 3.6C2.25 2.85441 2.85442 2.25 3.6 2.25H20.4C21.1456 2.25 21.75 2.85442 21.75 3.6V20.4C21.75 21.1456 21.1456 21.75 20.4 21.75H3.6C2.85441 21.75 2.25 21.1456 2.25 20.4V3.6ZM12 8.75C13.1313 8.75 13.75 9.45717 13.75 10C13.75 10.4191 13.6329 10.7217 13.4616 10.9111C13.3018 11.0877 13.0195 11.25 12.5 11.25C12.0858 11.25 11.75 11.5858 11.75 12C11.75 12.4142 12.0858 12.75 12.5 12.75C13.0195 12.75 13.3018 12.9123 13.4616 13.0889C13.6329 13.2783 13.75 13.5809 13.75 14C13.75 14.5428 13.1313 15.25 12 15.25C10.8687 15.25 10.25 14.5428 10.25 14C10.25 13.5858 9.91421 13.25 9.5 13.25C9.08579 13.25 8.75 13.5858 8.75 14C8.75 15.6663 10.3699 16.75 12 16.75C13.6301 16.75 15.25 15.6663 15.25 14C15.25 13.3145 15.0575 12.6171 14.574 12.0826C14.5484 12.0544 14.5223 12.0269 14.4955 12C14.5223 11.9732 14.5484 11.9456 14.574 11.9174C15.0575 11.3829 15.25 10.6855 15.25 10C15.25 8.33369 13.6301 7.25 12 7.25C10.3699 7.25 8.75 8.33369 8.75 10C8.75 10.4142 9.08579 10.75 9.5 10.75C9.91421 10.75 10.25 10.4142 10.25 10C10.25 9.45717 10.8687 8.75 12 8.75Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );