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="M9 6C7.34315 6 6 7.34315 6 9V39C6 40.6569 7.34315 42 9 42H39C40.6569 42 42 40.6569 42 39V9C42 7.34315 40.6569 6 39 6H9ZM15.7753 22.4773C18.0541 18.4116 20.0889 14.7814 20.0889 10C24.076 13.3085 27.809 17.0219 29.1179 22.0909C29.1901 21.9512 29.2665 21.805 29.3461 21.6526C29.9917 20.4169 30.8466 18.7805 31.33 17C34.1463 25.6833 34.6627 33.334 25 38C25.7372 33.5009 25.5254 30.4353 23.1926 26.2587C19.3994 30.0689 18.5926 32.9306 18.5926 38C15.0904 33.5826 12.2373 28.8208 15.3041 23.3195C15.4619 23.0364 15.6192 22.7558 15.7753 22.4773Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );