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="M3.6 2.25C2.85442 2.25 2.25 2.85441 2.25 3.6V20.4C2.25 21.1456 2.85441 21.75 3.6 21.75H20.4C21.1456 21.75 21.75 21.1456 21.75 20.4V3.6C21.75 2.85442 21.1456 2.25 20.4 2.25H3.6ZM13.75 13.5C13.75 14.5623 12.9904 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 16.75C13.771 16.75 15.25 15.4377 15.25 13.5C15.25 12.6639 15.08 11.8552 14.6182 11.2381C14.1302 10.586 13.3931 10.25 12.5 10.25H10.3853L10.6353 8.75H14C14.4142 8.75 14.75 8.41421 14.75 8C14.75 7.58579 14.4142 7.25 14 7.25H10C9.63337 7.25 9.32048 7.51506 9.2602 7.8767L8.7602 10.8767C8.72396 11.0942 8.78523 11.3166 8.92773 11.4848C9.07024 11.653 9.27954 11.75 9.5 11.75H12.5C12.9876 11.75 13.2505 11.914 13.4173 12.1369C13.6103 12.3948 13.75 12.8361 13.75 13.5Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );