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="M3 9.25C2.58579 9.25 2.25 9.58579 2.25 10V19C2.25 20.5188 3.48122 21.75 5 21.75H14.5681L14.4091 21.591C13.5304 20.7123 13.5304 19.2877 14.4091 18.409C15.2878 17.5303 16.7124 17.5303 17.5911 18.409L18.0001 18.818L20.4091 16.409C20.7847 16.0334 21.2601 15.8183 21.75 15.7639V10C21.75 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"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M15.4698 19.4697C15.7627 19.1768 16.2376 19.1768 16.5304 19.4697L18.0001 20.9393L21.4698 17.4697C21.7627 17.1768 22.2376 17.1768 22.5304 17.4697C22.8233 17.7626 22.8233 18.2374 22.5304 18.5303L18.5304 22.5303C18.2376 22.8232 17.7627 22.8232 17.4698 22.5303L15.4698 20.5303C15.1769 20.2374 15.1769 19.7626 15.4698 19.4697Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );