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="M2.25 3.6C2.25 2.85441 2.85442 2.25 3.6 2.25H20.4C21.1456 2.25 21.75 2.85442 21.75 3.6V20.4C21.75 21.1456 21.1456 21.75 20.4 21.75H3.6C2.85441 21.75 2.25 21.1456 2.25 20.4V3.6ZM5.25 18C5.25 17.5858 5.58579 17.25 6 17.25L18 17.25C18.4142 17.25 18.75 17.5858 18.75 18C18.75 18.4142 18.4142 18.75 18 18.75L6 18.75C5.58579 18.75 5.25 18.4142 5.25 18ZM12.5303 5.46967C12.2374 5.17678 11.7626 5.17678 11.4697 5.46967L7.96967 8.96967C7.67678 9.26256 7.67678 9.73744 7.96967 10.0303C8.26256 10.3232 8.73744 10.3232 9.03033 10.0303L11.25 7.81066V14C11.25 14.4142 11.5858 14.75 12 14.75C12.4142 14.75 12.75 14.4142 12.75 14V7.81066L14.9697 10.0303C15.2626 10.3232 15.7374 10.3232 16.0303 10.0303C16.3232 9.73744 16.3232 9.26256 16.0303 8.96967L12.5303 5.46967Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );