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 22H11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M8 10H16M8 6H12M8 14H11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M17.9541 16.9394L18.9541 15.9394C19.392 15.5015 20.102 15.5015 20.5399 15.9394V15.9394C20.9778 16.3773 20.9778 17.0873 20.5399 17.5252L19.5399 18.5252M17.9541 16.9394L14.963 19.9305C14.8131 20.0804 14.7147 20.2741 14.6821 20.4835L14.4394 22.0399L15.9957 21.7973C16.2052 21.7646 16.3988 21.6662 16.5487 21.5163L19.5399 18.5252M17.9541 16.9394L19.5399 18.5252" 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"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );