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="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M4 21.4V2.6C4 2.26863 4.26863 2 4.6 2H16.2515C16.4106 2 16.5632 2.06321 16.6757 2.17574L19.8243 5.32426C19.9368 5.43679 20 5.5894 20 5.74853V21.4C20 21.7314 19.7314 22 19.4 22H4.6C4.26863 22 4 21.7314 4 21.4Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M10.6349 10.4151L11.674 8.21211C11.8073 7.9293 12.1927 7.9293 12.326 8.21211L13.3651 10.4151L15.6886 10.7706C15.9867 10.8162 16.1055 11.1997 15.8897 11.4198L14.2087 13.1334L14.6054 15.5543C14.6564 15.8652 14.3446 16.1022 14.0778 15.9554L12 14.8118L9.92219 15.9554C9.65544 16.1022 9.34363 15.8652 9.39458 15.5543L9.7913 13.1334L8.1103 11.4198C7.89447 11.1997 8.01329 10.8162 8.31141 10.7706L10.6349 10.4151Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16 2V5.4C16 5.73137 16.2686 6 16.6 6H20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );