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" stroke-width="1.5" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M9 14C9 15.6099 10.3771 16 12.0758 16C14.9661 16 15.9206 14.3333 13.9982 11C11.3069 14 10.9224 9.33333 11.3069 8C10.1534 10 9 11.8785 9 14Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M12 16C15.1559 16 17 13.9024 17 10.3125C17 6.72265 12 3 12 3C12 3 7 6.72265 7 10.3125C7 13.9024 8.84409 16 12 16Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M4.27258 21.0703L19.7274 16.9292" stroke="currentColor" stroke-linecap="round"/>
<path d="M4.27259 16.9292L12 18.9998" stroke="currentColor" stroke-linecap="round"/>
<path d="M19.7274 21.0703L15.8637 20.035" stroke="currentColor" stroke-linecap="round"/>
</svg>
''',
colorFilter:
color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
width: width,
height: height,
);