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="M9.99998 15L9.99999 19C10 20.1046 9.10457 21 7.99999 21H4C2.89543 21 2 20.1046 2 19V15C2 13.8954 2.89543 13 4 13H7.99998C9.10455 13 9.99998 13.8954 9.99998 15Z" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16 4.99999L16 8.99999C16 10.1046 15.1046 11 14 11H10C8.89543 11 8 10.1046 8 9V5C8 3.89543 8.89543 3 10 3H14C15.1045 3 16 3.89543 16 4.99999Z" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
<path d="M22 15L22 19C22 20.1046 21.1046 21 20 21H16C14.8954 21 14 20.1046 14 19V15C14 13.8954 14.8954 13 16 13H20C21.1045 13 22 13.8954 22 15Z" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
<path d="M6 16V13" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 6V3" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
<path d="M18 16V13" stroke="currentColor"   stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );