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="M17 7C17 5.34315 18.3431 4 20 4H28C29.6569 4 31 5.34315 31 7H34C35.6569 7 37 8.34315 37 10V25H35V10C35 9.44772 34.5523 9 34 9H31C31 10.6569 29.6569 12 28 12H20C18.3431 12 17 10.6569 17 9H14C13.4477 9 13 9.44772 13 10V38C13 38.5523 13.4477 39 14 39H26V41H14C12.3431 41 11 39.6569 11 38V10C11 8.34315 12.3431 7 14 7H17ZM20 6C19.4477 6 19 6.44772 19 7V9C19 9.55228 19.4477 10 20 10H28C28.5523 10 29 9.55228 29 9V7C29 6.44772 28.5523 6 28 6H20ZM23 16V19H20V21H23V24H25V21H28V19H25V16H23ZM28 27C27.4477 27 27 27.4477 27 28V34.7889C27 37.1294 28.1697 39.315 30.1171 40.6133L33.4453 42.8321C33.7812 43.056 34.2188 43.056 34.5547 42.8321L37.8829 40.6133C39.8303 39.315 41 37.1294 41 34.7889V28C41 27.4477 40.5523 27 40 27H28ZM37.7071 32.7072L33.7071 36.7072C33.3165 37.0977 32.6834 37.0977 32.2928 36.7072L30.2928 34.7072L31.7071 33.293L33 34.5859L36.2928 31.293L37.7071 32.7072Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );