build method

  1. @override
Widget build(
  1. BuildContext context
)
override

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:

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(
      '''
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<path d="M19.7574 9.75748C19.2002 10.3146 18.7583 10.9761 18.4567 11.704C18.1552 12.432 18 13.2122 18 14.0001C18 14.788 18.1552 15.5683 18.4567 16.2962C18.7583 17.0242 19.2002 17.6856 19.7574 18.2428L18.3431 19.657C17.6003 18.9141 17.011 18.0322 16.609 17.0616C16.2069 16.091 16 15.0507 16 14.0001C16 12.9495 16.2069 11.9093 16.609 10.9386C17.011 9.96804 17.6003 9.08613 18.3431 8.34326L19.7574 9.75748Z" fill="black"/>
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<path fill-rule="evenodd" clip-rule="evenodd" d="M10 28C10 26.3431 11.3431 25 13 25H35C36.6569 25 38 26.3431 38 28V41C38 42.6569 36.6569 44 35 44H13C11.3431 44 10 42.6569 10 41V28ZM12 28C12 27.4477 12.4477 27 13 27H35C35.5523 27 36 27.4477 36 28V41C36 41.5523 35.5523 42 35 42H13C12.4477 42 12 41.5523 12 41V28Z" fill="black"/>
</svg>
''',
      colorFilter:
          color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
      width: width,
      height: height,
    );