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="M31 10C30.4477 10 30 10.4477 30 11C30 11.5523 30.4477 12 31 12V19H28V12C28.5523 12 29 11.5523 29 11C29 10.4477 28.5523 10 28 10H20C19.4477 10 19 10.4477 19 11C19 11.5523 19.4477 12 20 12V19H17V12C17.5523 12 18 11.5523 18 11C18 10.4477 17.5523 10 17 10H9C8.44772 10 8 10.4477 8 11C8 11.5523 8.44772 12 9 12V19H7V16H5V19H4V21H5V34H4V36H5V38H7V36L41 36V38H43V36H44V34H43V21H44V19H43V16H41V19H39V12C39.5523 12 40 11.5523 40 11C40 10.4477 39.5523 10 39 10H31ZM37 19V12H33V19L37 19ZM33 21L37 21V26H33V21ZM31 21V29C31 31.2091 32.7909 33 35 33C37.2091 33 39 31.2091 39 29V21H41V34L7 34V21H9V29C9 31.2091 10.7909 33 13 33C15.2091 33 17 31.2091 17 29V21H20V29C20 31.2091 21.7909 33 24 33C26.2091 33 28 31.2091 28 29V21H31ZM26 19V12H22V19H26ZM15 19V12H11V19L15 19ZM11 21L15 21V23H11V21Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );