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" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M7 14C8.10457 14 9 13.1046 9 12C9 10.8954 8.10457 10 7 10C5.89543 10 5 10.8954 5 12C5 13.1046 5.89543 14 7 14Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M17 14C18.1046 14 19 13.1046 19 12C19 10.8954 18.1046 10 17 10C15.8954 10 15 10.8954 15 12C15 13.1046 15.8954 14 17 14Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 9C13.1046 9 14 8.10457 14 7C14 5.89543 13.1046 5 12 5C10.8954 5 10 5.89543 10 7C10 8.10457 10.8954 9 12 9Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 19C13.1046 19 14 18.1046 14 17C14 15.8954 13.1046 15 12 15C10.8954 15 10 15.8954 10 17C10 18.1046 10.8954 19 12 19Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M2 12C2 17.5228 6.47715 22 12 22C17.5228 22 22 17.5228 22 12C22 6.47715 17.5228 2 12 2C6.47715 2 2 6.47715 2 12ZM2 12V22" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );