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="M12 21H4C2.89543 21 2 20.1046 2 19V5C2 3.89543 2.89543 3 4 3H20C21.1046 3 22 3.89543 22 5V12" stroke="currentColor" stroke-linecap="round"/>
<path d="M2 7L22 7" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M5 5.01L5.01 4.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M8 5.01L8.01 4.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M11 5.01L11.01 4.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M18 14L19.2246 15.0436L20.8284 15.1716L20.9564 16.7754L22 18L20.9564 19.2246L20.8284 20.8284L19.2246 20.9564L18 22L16.7754 20.9564L15.1716 20.8284L15.0436 19.2246L14 18L15.0436 16.7754L15.1716 15.1716L16.7754 15.0436L18 14Z" stroke="currentColor"/>
<path d="M16.7754 20.9564L18 22V14L16.7754 15.0436L15.1716 15.1716L15.0436 16.7754L14 18L15.0436 19.2246L15.1716 20.8284L16.7754 20.9564Z" fill="currentColor"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );