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="M22 9V17C22 18.1046 21.1046 19 20 19H4C2.89543 19 2 18.1046 2 17V7C2 5.89543 2.89543 5 4 5H20C21.1046 5 22 5.89543 22 7V9ZM22 9H6" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16.5 13.3819C16.7654 13.1444 17.1158 13 17.5 13C18.3284 13 19 13.6716 19 14.5C19 15.3284 18.3284 16 17.5 16C17.1158 16 16.7654 15.8556 16.5 15.6181" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16.5 13.3819C16.2346 13.1444 15.8842 13 15.5 13C14.6716 13 14 13.6716 14 14.5C14 15.3284 14.6716 16 15.5 16C15.8842 16 16.2346 15.8556 16.5 15.6181" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );