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="M13.5 11C15.433 11 17 12.567 17 14.5V40L13.5 44L10 40V14.5C10 12.567 11.567 11 13.5 11ZM13.5 13C14.3284 13 15 13.6716 15 14.5V17H12V14.5C12 13.6716 12.6716 13 13.5 13ZM13.5 40.9628L12 39.2485V19H15V39.2485L13.5 40.9628Z" fill="black"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M33 28C31.8954 28 31 28.8954 31 30V42C31 43.1046 31.8954 44 33 44H36C37.1046 44 38 43.1046 38 42V30C38 28.8954 37.1046 28 36 28H33ZM36 30H33V35H36V30ZM36 37H33V42H36V37Z" fill="black"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M29 4H19V44H29V4ZM21 6H27V8H23V10H27V13H25V15H27V18H25V20H27V23H23V25H27V28H25V30H27V33H25V35H27V38H23V40H27V42H21V6Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );