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 12V21H29V12C29 10.3431 30.3431 9 32 9C33.6569 9 35 10.3431 35 12V36C35 37.6569 33.6569 39 32 39C30.3431 39 29 37.6569 29 36V27H19V36C19 37.6569 17.6569 39 16 39C14.3431 39 13 37.6569 13 36V12ZM16 11C15.4477 11 15 11.4477 15 12V36C15 36.5523 15.4477 37 16 37C16.5523 37 17 36.5523 17 36V25H31V36C31 36.5523 31.4477 37 32 37C32.5523 37 33 36.5523 33 36V12C33 11.4477 32.5523 11 32 11C31.4477 11 31 11.4477 31 12V23H17V12C17 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,
    );