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="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M39 9.75V16.1786C39 18.2496 32.2843 19.9286 24 19.9286C15.7157 19.9286 9 18.2496 9 16.1786V9.75C9 7.67893 15.7157 6 24 6C32.2843 6 39 7.67893 39 9.75ZM9.62114 19.7144C11.4651 21.2634 17.2049 22.393 24 22.393C30.7951 22.393 36.5349 21.2634 38.3789 19.7144C38.783 20.0538 39 20.4134 39 20.7857V27.2143C39 29.2853 32.2843 30.9643 24 30.9643C15.7157 30.9643 9 29.2853 9 27.2143V20.7858C9.00002 20.4135 9.21703 20.0538 9.62114 19.7144ZM24 33.6786C17.205 33.6786 11.4652 32.549 9.62118 31C9.21703 31.3395 9 31.6991 9 32.0714V38.5C9 40.5711 15.7157 42.25 24 42.25C32.2843 42.25 39 40.5711 39 38.5V32.0714C39 31.6991 38.783 31.3395 38.3788 31C36.5348 32.549 30.795 33.6786 24 33.6786ZM32.3333 37.3333C32.3333 37.9777 31.811 38.5 31.1667 38.5C30.5223 38.5 30 37.9777 30 37.3333C30 36.689 30.5223 36.1667 31.1667 36.1667C31.811 36.1667 32.3333 36.689 32.3333 37.3333ZM35.8333 37.3333C36.4777 37.3333 37 36.811 37 36.1667C37 35.5223 36.4777 35 35.8333 35C35.189 35 34.6667 35.5223 34.6667 36.1667C34.6667 36.811 35.189 37.3333 35.8333 37.3333Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );