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" stroke-width="1.5" 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 2.85442 2.25 3.6V20.4C2.25 21.1456 2.85444 21.75 3.6 21.75H20.4C21.1456 21.75 21.75 21.1456 21.75 20.4V3.6C21.75 2.85444 21.1456 2.25 20.4 2.25H3.6ZM13.8696 6.25C11.3499 6.25 9.23714 7.93891 8.51555 10.25H8C7.58579 10.25 7.25 10.5858 7.25 11C7.25 11.4142 7.58579 11.75 8 11.75H8.25524C8.25176 11.8329 8.25 11.9163 8.25 12C8.25 12.0837 8.25176 12.1671 8.25524 12.25H8C7.58579 12.25 7.25 12.5858 7.25 13C7.25 13.4142 7.58579 13.75 8 13.75H8.51555C9.23714 16.0611 11.3499 17.75 13.8696 17.75C14.7533 17.75 15.5908 17.5407 16.3355 17.1682C16.706 16.9828 16.8561 16.5323 16.6708 16.1619C16.4854 15.7914 16.0349 15.6413 15.6645 15.8266C15.1222 16.0979 14.5139 16.25 13.8696 16.25C12.2097 16.25 10.7628 15.2307 10.1137 13.75H14C14.4142 13.75 14.75 13.4142 14.75 13C14.75 12.5858 14.4142 12.25 14 12.25H9.75697C9.75235 12.1673 9.75 12.084 9.75 12C9.75 11.916 9.75235 11.8327 9.75697 11.75H14C14.4142 11.75 14.75 11.4142 14.75 11C14.75 10.5858 14.4142 10.25 14 10.25H10.1137C10.7628 8.76931 12.2097 7.75 13.8696 7.75C14.5139 7.75 15.1222 7.90209 15.6644 8.17337C16.0348 8.35872 16.4854 8.20869 16.6707 7.83826C16.8561 7.46783 16.706 7.01728 16.3356 6.83193C15.5908 6.45923 14.7533 6.25 13.8696 6.25Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );