build method

  1. @override
Widget build(
  1. BuildContext context
)
override

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:

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(
      '''
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<path fill-rule="evenodd" clip-rule="evenodd" d="M38.0586 8.81882C33.6257 6.91845 28.8352 5.95858 24 6.00137C19.1648 5.95858 14.3743 6.91845 9.94142 8.81882L9.92574 8.8257C9.35116 9.08376 8.86205 9.50073 8.51935 10.0289C8.17724 10.5561 7.99628 11.1709 8.00006 11.7993V23.3011C8.00006 26.2585 8.6588 29.7788 10.7625 33.1062C12.8726 36.4437 16.3923 39.5159 21.9897 41.6333C23.2839 42.1222 24.716 42.1223 26.0103 41.6333C31.6073 39.519 35.1262 36.434 37.2362 33.0901C39.3396 29.7569 39.9999 26.2354 39.9999 23.3011V11.7992C40.0037 11.1709 39.8227 10.5561 39.4806 10.0289C39.138 9.50073 38.6488 9.08376 38.0743 8.8257L38.0586 8.81882ZM12.453 32.0374C10.5944 29.0977 10.0001 25.9694 10.0001 23.3011V11.796H9.00009L10 11.7887C9.99832 11.5525 10.0661 11.3194 10.1971 11.1175C10.327 10.9174 10.5141 10.7555 10.7384 10.6532C14.9161 8.86366 19.4321 7.95983 23.9909 8.00137H24.0091C28.5679 7.95983 33.0839 8.86366 37.2616 10.6532C37.4859 10.7554 37.673 10.9174 37.8029 11.1175C37.9339 11.3194 38.0017 11.5525 37.9999 11.7887V23.3011C37.9999 25.9441 37.4049 29.075 35.5448 32.0228C33.6914 34.96 30.5388 37.7847 25.3035 39.7623C24.4649 40.0792 23.5356 40.0792 22.6969 39.7625C17.4574 37.7805 14.3051 34.9669 12.453 32.0374Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );