b4ff5ca6ae
This patch contains a prototype of a new widget framework. In this framework, Components can be reused in the tree as many times as the author desires. Also, StatefulComponent is split into two pieces, a ComponentConfiguration and a ComponentState. The ComponentConfiguration is created by the author and can be reused as many times as desired. When mounted into the tree, the ComponentConfiguration creates a ComponentState to hold the state for the component. The state remains in the tree and cannot be reused.
45 lines
954 B
Dart
45 lines
954 B
Dart
import 'package:sky/src/fn3/framework.dart';
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class TestComponent extends Component {
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TestComponent({ this.child });
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final Widget child;
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Widget build() => child;
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}
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class WidgetTester {
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ComponentElement _rootElement;
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void walkElements(ElementVisitor visitor) {
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void walk(Element element) {
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visitor(element);
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element.visitChildren(walk);
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}
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_rootElement.visitChildren(walk);
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}
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Element findElement(bool predicate(Element widget)) {
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try {
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walkElements((Element widget) {
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if (predicate(widget))
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throw widget;
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});
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} catch (e) {
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if (e is Element)
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return e;
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rethrow;
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}
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return null;
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}
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void pumpFrame(Widget widget) {
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if (_rootElement == null) {
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_rootElement = new ComponentElement(new TestComponent(child: widget));
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_rootElement.mount(null);
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} else {
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_rootElement.update(new TestComponent(child: widget), null);
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}
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}
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}
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