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" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M18 20L21.8243 16.1757C21.9368 16.0632 22 15.9106 22 15.7515V10.5C22 9.67157 21.3284 9 20.5 9V9C19.6716 9 19 9.67157 19 10.5V15" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M18 16L18.8581 15.1419C18.949 15.051 19 14.9278 19 14.7994V14.7994C19 14.6159 18.8963 14.4482 18.7322 14.3661L18.2893 14.1447C17.5194 13.7597 16.5894 13.9106 15.9807 14.5193L15.0858 15.4142C14.7107 15.7893 14.5 16.298 14.5 16.8284V20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M6 20L2.17574 16.1757C2.06321 16.0632 2 15.9106 2 15.7515V10.5C2 9.67157 2.67157 9 3.5 9V9C4.32843 9 5 9.67157 5 10.5V15" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M6 16L5.14187 15.1419C5.05103 15.051 5 14.9278 5 14.7994V14.7994C5 14.6159 5.10366 14.4482 5.26776 14.3661L5.71067 14.1447C6.48064 13.7597 7.41059 13.9106 8.01931 14.5193L8.91421 15.4142C9.28929 15.7893 9.5 16.298 9.5 16.8284V20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M13.6667 12H10.3333V9.66667H8V6.33333H10.3333V4H13.6667V6.33333H16V9.66667H13.6667V12Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );