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="M0.25 7C0.25 5.48122 1.48122 4.25 3 4.25H16C17.5188 4.25 18.75 5.48122 18.75 7V9.12865C18.6296 9.20924 18.5153 9.30269 18.409 9.40901L15.409 12.409C14.5303 13.2877 14.5303 14.7123 15.409 15.591L18.3103 18.4923C17.8204 19.2491 16.9687 19.75 16 19.75H3C1.48122 19.75 0.25 18.5188 0.25 17V7ZM16.4697 13.4697L18.75 11.1893V16.8107L17.75 15.8107L16.4697 14.5303C16.1768 14.2374 16.1768 13.7626 16.4697 13.4697ZM5.41598 8.37596C5.07134 8.1462 4.60568 8.23933 4.37592 8.58397C4.14616 8.92862 4.23929 9.39427 4.58393 9.62404L9.08393 12.624C9.33586 12.792 9.66406 12.792 9.91598 12.624L14.416 9.62404C14.7606 9.39427 14.8538 8.92862 14.624 8.58397C14.3942 8.23933 13.9286 8.1462 13.5839 8.37596L9.49996 11.0986L5.41598 8.37596Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M20.5303 10.4697C20.8232 10.7626 20.8232 11.2374 20.5303 11.5303L18.8107 13.25H23C23.4142 13.25 23.75 13.5858 23.75 14C23.75 14.4142 23.4142 14.75 23 14.75H18.8107L20.5303 16.4697C20.8232 16.7626 20.8232 17.2374 20.5303 17.5303C20.2374 17.8232 19.7626 17.8232 19.4697 17.5303L16.4697 14.5303C16.1768 14.2374 16.1768 13.7626 16.4697 13.4697L19.4697 10.4697C19.7626 10.1768 20.2374 10.1768 20.5303 10.4697Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );