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" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M21.75 17C21.75 19.6234 19.6234 21.75 17 21.75H7C4.37665 21.75 2.25 19.6234 2.25 17V7C2.25 4.37665 4.37665 2.25 7 2.25H17C19.6234 2.25 21.75 4.37665 21.75 7V17ZM18.25 16C18.25 16.4142 17.9142 16.75 17.5 16.75H16C14.4812 16.75 13.25 15.5188 13.25 14V12C13.25 10.4812 14.4812 9.25 16 9.25C17.5188 9.25 18.75 10.4812 18.75 12V13C18.75 13.4142 18.4142 13.75 18 13.75H14.75V14C14.75 14.6904 15.3096 15.25 16 15.25H17.5C17.9142 15.25 18.25 15.5858 18.25 16ZM17.25 12.25V12C17.25 11.3096 16.6904 10.75 16 10.75C15.3096 10.75 14.75 11.3096 14.75 12V12.25H17.25ZM5.29796 15.7365C5.15252 16.1243 5.34902 16.5566 5.73686 16.702C6.1247 16.8475 6.55701 16.651 6.70245 16.2631L7.64495 13.7498H10.3555L11.298 16.2631C11.4434 16.651 11.8757 16.8475 12.2635 16.702C12.6514 16.5566 12.8479 16.1243 12.7024 15.7365L9.70245 7.73645C9.59268 7.44373 9.31284 7.2498 9.0002 7.2498C8.68757 7.2498 8.40773 7.44373 8.29796 7.73645L5.29796 15.7365ZM9.79295 12.2498H8.20745L9.0002 10.1358L9.79295 12.2498Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );