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="M20 12V5.74853C20 5.5894 19.9368 5.43679 19.8243 5.32426L16.6757 2.17574C16.5632 2.06321 16.4106 2 16.2515 2H4.6C4.26863 2 4 2.26863 4 2.6V21.4C4 21.7314 4.26863 22 4.6 22H13" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M8 10H16M8 6H12M8 14H11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M16 2V5.4C16 5.73137 16.2686 6 16.6 6H20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M19.9923 15.125L22.5477 15.774C22.8137 15.8416 23.0013 16.0833 22.9931 16.3576C22.8214 22.1159 19.5 23 19.5 23C19.5 23 16.1786 22.1159 16.0069 16.3576C15.9987 16.0833 16.1863 15.8416 16.4523 15.774L19.0077 15.125C19.3308 15.043 19.6692 15.043 19.9923 15.125Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );