build method

  1. @override
Widget build(
  1. BuildContext context
)
override

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:

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="M18.9922 15.25C19.4064 15.25 19.7422 15.5858 19.7422 16V18.25H22C22.4142 18.25 22.75 18.5858 22.75 19C22.75 19.4142 22.4142 19.75 22 19.75H19.7422V22C19.7422 22.4142 19.4064 22.75 18.9922 22.75C18.578 22.75 18.2422 22.4142 18.2422 22V19.75H15.9922C15.578 19.75 15.2422 19.4142 15.2422 19C15.2422 18.5858 15.578 18.25 15.9922 18.25H18.2422V16C18.2422 15.5858 18.578 15.25 18.9922 15.25Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M3 9.25C2.58579 9.25 2.25 9.58579 2.25 10V19C2.25 20.5188 3.48122 21.75 5 21.75H16C16.1989 21.75 16.3897 21.671 16.5303 21.5303L16.7422 21.3185V21.25H15.9922C14.7495 21.25 13.7422 20.2426 13.7422 19C13.7422 17.7574 14.7495 16.75 15.9922 16.75H16.7422V16C16.7422 14.7574 17.7495 13.75 18.9922 13.75C20.2348 13.75 21.2422 14.7574 21.2422 16V16.75H21.3107L21.5303 16.5303C21.671 16.3897 21.75 16.1989 21.75 16V10C21.75 9.58579 21.4142 9.25 21 9.25H3Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M7 1.25C7.41421 1.25 7.75 1.58579 7.75 2V6C7.75 6.41421 7.41421 6.75 7 6.75C6.58579 6.75 6.25 6.41421 6.25 6V4.75H5C4.30964 4.75 3.75 5.30964 3.75 6V10C3.75 10.4142 3.41421 10.75 3 10.75C2.58579 10.75 2.25 10.4142 2.25 10V6C2.25 4.48122 3.48122 3.25 5 3.25H6.25V2C6.25 1.58579 6.58579 1.25 7 1.25ZM15 1.25C15.4142 1.25 15.75 1.58579 15.75 2V6C15.75 6.41421 15.4142 6.75 15 6.75C14.5858 6.75 14.25 6.41421 14.25 6V4.75H10.5C10.0858 4.75 9.75 4.41421 9.75 4C9.75 3.58579 10.0858 3.25 10.5 3.25H14.25V2C14.25 1.58579 14.5858 1.25 15 1.25ZM17.75 4C17.75 3.58579 18.0858 3.25 18.5 3.25H19C20.5188 3.25 21.75 4.48122 21.75 6V10C21.75 10.4142 21.4142 10.75 21 10.75C20.5858 10.75 20.25 10.4142 20.25 10V6C20.25 5.30964 19.6904 4.75 19 4.75H18.5C18.0858 4.75 17.75 4.41421 17.75 4Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );