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="M13 12C13 10.3431 14.3431 9 16 9C17.6569 9 19 10.3431 19 12V28C19 30.7614 21.2386 33 24 33C26.7614 33 29 30.7614 29 28V12C29 10.3431 30.3431 9 32 9C33.6569 9 35 10.3431 35 12V28C35 34.0751 30.0751 39 24 39C17.9249 39 13 34.0751 13 28V12ZM16 11C15.4477 11 15 11.4477 15 12V28C15 32.9706 19.0294 37 24 37C28.9706 37 33 32.9706 33 28V12C33 11.4477 32.5523 11 32 11C31.4477 11 31 11.4477 31 12V28C31 31.866 27.866 35 24 35C20.134 35 17 31.866 17 28V12C17 11.4477 16.5523 11 16 11Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );