build method
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" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M22.586 10.1727C21.8345 10.3747 20.9988 10.1808 20.409 9.59099L19.8676 9.04958C19.4339 9.1799 18.9745 9.25 18.5 9.25C15.8766 9.25 13.75 7.12335 13.75 4.5C13.75 3.44345 14.095 2.46747 14.6784 1.67853C13.8537 1.38277 13.0741 1.30304 13.0741 1.30304C12.7206 1.26795 12.3623 1.25 12 1.25C6.06294 1.25 1.25 6.06294 1.25 12C1.25 13.8563 1.72113 15.6046 2.55076 17.1298L1.76267 21.3627C1.71742 21.6058 1.79485 21.8555 1.96967 22.0303C2.14449 22.2051 2.39423 22.2826 2.63728 22.2373L6.87016 21.4492C8.39536 22.2789 10.1437 22.75 12 22.75C17.9371 22.75 22.75 17.9371 22.75 12C22.75 11.6377 22.7321 11.2794 22.697 10.9259C22.697 10.9259 22.6521 10.6014 22.586 10.1727Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M19.9697 5.96967C20.2626 5.67678 20.7374 5.67678 21.0303 5.96967L22.5303 7.46967C22.8232 7.76256 22.8232 8.23744 22.5303 8.53033C22.2374 8.82322 21.7626 8.82322 21.4697 8.53033L19.9697 7.03033C19.6768 6.73744 19.6768 6.26256 19.9697 5.96967Z" fill="currentColor"/>
<path fill-rule="evenodd" clip-rule="evenodd" d="M18.5 2.75C17.5335 2.75 16.75 3.5335 16.75 4.5C16.75 5.4665 17.5335 6.25 18.5 6.25C18.9843 6.25 19.4214 6.05427 19.7391 5.73579C20.0556 5.41841 20.25 4.98263 20.25 4.5C20.25 3.5335 19.4665 2.75 18.5 2.75ZM15.25 4.5C15.25 2.70507 16.7051 1.25 18.5 1.25C20.2949 1.25 21.75 2.70507 21.75 4.5C21.75 5.39569 21.3867 6.20797 20.8011 6.79504C20.2136 7.38414 19.3988 7.75 18.5 7.75C16.7051 7.75 15.25 6.29493 15.25 4.5Z" fill="currentColor"/>
</svg>
''',
colorFilter:
color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
width: width,
height: height,
);