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 8H9C8.44771 8 8 8.44772 8 9V39C8 39.5523 8.44772 40 9 40H39C39.5523 40 40 39.5523 40 39V9C40 8.44771 39.5523 8 39 8ZM9 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 6H9Z" fill="black"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M20.0889 10C20.0889 15.1089 17.7658 18.9036 15.3041 23.3195C12.2373 28.8208 15.0904 33.5826 18.5926 38C18.5926 32.9306 19.3994 30.0689 23.1926 26.2587C25.5254 30.4353 25.7372 33.5009 25 38C34.6627 33.334 34.1463 25.6833 31.33 17C30.787 19 29.7752 20.8182 29.1179 22.0909C27.809 17.0219 24.076 13.3085 20.0889 10Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );