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" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M11.5 11L11.0422 2.76019C11.0207 2.37268 10.6425 2.10725 10.2707 2.21878L6.814 3.2558C6.417 3.3749 6.25746 3.85108 6.50256 4.18531L11.5 11Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M14 12.5L18.5692 11.6692C19.0021 11.5905 19.2058 11.0882 18.9501 10.7302L17.5053 8.70738C17.2612 8.3657 16.7507 8.37393 16.5178 8.7233L14 12.5Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M14.5 16L16.5658 20.1317C16.7653 20.5306 17.3149 20.5802 17.5825 20.2233L19.4175 17.7767C19.6851 17.4198 19.4837 16.9061 19.0448 16.8263L14.5 16Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M11.5 16.5L8.15888 19.8411C7.85032 20.1497 7.96388 20.674 8.37247 20.8272L10.6893 21.696C11.0816 21.8431 11.5 21.5531 11.5 21.1342V16.5Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
<path d="M9.5 14L5.36833 11.9342C4.96939 11.7347 4.5 12.0248 4.5 12.4708V15.1138C4.5 15.5383 4.92872 15.8285 5.32283 15.6709L9.5 14Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
''',
colorFilter:
color != null ? widgets.ColorFilter.mode(color!, widgets.BlendMode.srcIn) : null,
width: width,
height: height,
);