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(
  '''
<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M17.2803 15.2197C17.5732 15.5126 17.5732 15.9875 17.2803 16.2804L13.7803 19.7804C13.5658 19.9949 13.2432 20.059 12.963 19.9429C12.6827 19.8268 12.5 19.5534 12.5 19.25V12.25C12.5 11.9467 12.6827 11.6732 12.963 11.5571C13.2432 11.441 13.5658 11.5052 13.7803 11.7197L17.2803 15.2197Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M14.5 15.75C14.5 16.1642 14.1642 16.5 13.75 16.5H10.75C8.12665 16.5 6 14.3734 6 11.75V4.75C6 4.33579 6.33579 4 6.75 4C7.16421 4 7.5 4.33579 7.5 4.75V11.75C7.5 13.5449 8.95507 15 10.75 15H13.75C14.1642 15 14.5 15.3358 14.5 15.75Z" fill="currentColor"/>
</svg>
''',
  colorFilter: color != null
      ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn)
      : null,
  width: width,
  height: height,
);