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 d="M17 31V29H19V31H17Z" fill="black"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M20 4C18.3431 4 17 5.34315 17 7H13C11.3431 7 10 8.34315 10 10V41C10 42.6569 11.3431 44 13 44H35C36.6569 44 38 42.6569 38 41V10C38 8.34315 36.6569 7 35 7H31C31 5.34315 29.6569 4 28 4H20ZM19 7C19 6.44772 19.4477 6 20 6H28C28.5523 6 29 6.44772 29 7V9C29 9.55228 28.5523 10 28 10H20C19.4477 10 19 9.55228 19 9V7ZM16 20C15.4477 20 15 20.4477 15 21C15 21.5523 15.4477 22 16 22H23C23.5523 22 24 21.5523 24 21C24 20.4477 23.5523 20 23 20H16ZM15 16C15 15.4477 15.4477 15 16 15H31.5C32.0523 15 32.5 15.4477 32.5 16C32.5 16.5523 32.0523 17 31.5 17H16C15.4477 17 15 16.5523 15 16ZM15 28C15 27.4477 15.4477 27 16 27H20C20.5523 27 21 27.4477 21 28V32C21 32.5523 20.5523 33 20 33H16C15.4477 33 15 32.5523 15 32V28ZM28 32C29.6575 32 31 30.6575 31 29C31 27.3425 29.6575 26 28 26C26.3425 26 25 27.3425 25 29C25 30.6575 26.3425 32 28 32ZM22 36.5001C22 34.3842 25.9975 33.3182 28 33.3182C30.0025 33.3182 34 34.3842 34 36.5001V38.9999H22V36.5001Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );