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="M1.25 6C1.25 3.92894 2.92894 2.25 5 2.25H7C9.07106 2.25 10.75 3.92894 10.75 6V18C10.75 20.0711 9.07106 21.75 7 21.75H5C2.92894 21.75 1.25 20.0711 1.25 18V6Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M15.25 3C15.25 2.58579 15.5858 2.25 16 2.25H18C20.6233 2.25 22.75 4.37664 22.75 7V17C22.75 19.6233 20.6233 21.75 18 21.75H16C15.5858 21.75 15.25 21.4142 15.25 21C15.25 20.5858 15.5858 20.25 16 20.25H18C19.7949 20.25 21.25 18.7949 21.25 17V7C21.25 5.20508 19.7949 3.75 18 3.75H16C15.5858 3.75 15.25 3.41421 15.25 3Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M14.4697 8.46967C14.7626 8.17678 15.2374 8.17678 15.5303 8.46967L18.5303 11.4697C18.8232 11.7626 18.8232 12.2374 18.5303 12.5303L15.5303 15.5303C15.2374 15.8232 14.7626 15.8232 14.4697 15.5303C14.1768 15.2374 14.1768 14.7626 14.4697 14.4697L16.1893 12.75H10C9.58579 12.75 9.25 12.4142 9.25 12C9.25 11.5858 9.58579 11.25 10 11.25H16.1893L14.4697 9.53033C14.1768 9.23744 14.1768 8.76256 14.4697 8.46967Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );