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="M16 5H29L38 14V37C38 38.1046 37.1046 39 36 39H16C14.8954 39 14 38.1046 14 37V7C14 5.89543 14.8954 5 16 5ZM35 14L29 8V13C29 13.5523 29.4477 14 30 14H35ZM32.7071 21.2929C33.0976 21.6834 33.0976 22.3166 32.7071 22.7071L24 31.4142L19.2929 26.7071C18.9024 26.3166 18.9024 25.6834 19.2929 25.2929C19.6834 24.9024 20.3166 24.9024 20.7071 25.2929L24 28.5858L31.2929 21.2929C31.6834 20.9024 32.3166 20.9024 32.7071 21.2929Z" fill="black"/>
<path d="M12 11H10V38C10 40.7614 12.2386 43 15 43H34V41H15C13.3431 41 12 39.6569 12 38V11Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );