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 d="M12 3C12.5523 3 13 2.55228 13 2C13 1.44772 12.5523 1 12 1C11.4477 1 11 1.44772 11 2C11 2.55228 11.4477 3 12 3Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 22C16.4183 22 20 17.5228 20 12C20 6.47715 16.4183 2 12 2C7.58172 2 4 6.47715 4 12C4 17.5228 7.58172 22 12 22Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 23C12.5523 23 13 22.5523 13 22C13 21.4477 12.5523 21 12 21C11.4477 21 11 21.4477 11 22C11 22.5523 11.4477 23 12 23Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );