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63 行
2.1 KiB
63 行
2.1 KiB
using System;
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using System.Collections.Generic;
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using Unity.UIWidgets.async2;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.gestures;
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using Unity.UIWidgets.rendering;
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using Unity.UIWidgets.scheduler2;
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using Unity.UIWidgets.ui;
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namespace Unity.UIWidgets.widgets {
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public abstract class InheritedTheme : InheritedWidget {
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public InheritedTheme(
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Key key = null,
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Widget child = null
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) : base(key: key, child: child) {
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}
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public abstract Widget wrap(BuildContext context, Widget child);
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public static Widget captureAll(BuildContext context, Widget child) {
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D.assert(child != null);
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D.assert(context != null);
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List<InheritedTheme> themes = new List<InheritedTheme>();
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HashSet<Type> themeTypes = new HashSet<Type>();
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context.visitAncestorElements((Element ancestor)=> {
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if (ancestor is InheritedElement && ancestor.widget is InheritedTheme) {
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InheritedTheme theme = ancestor.widget as InheritedTheme;
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Type themeType = theme.GetType();
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if (!themeTypes.Contains(themeType)) {
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themeTypes.Add(themeType);
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themes.Add(theme);
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}
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}
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return true;
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});
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return new _CaptureAll(themes: themes, child: child);
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}
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}
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public class _CaptureAll : StatelessWidget {
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public _CaptureAll(
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Key key = null,
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List<InheritedTheme> themes = null,
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Widget child = null
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) : base(key: key) {
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D.assert(themes != null);
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D.assert(child != null);
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this.child = child;
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this.themes = themes;
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}
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public readonly List<InheritedTheme> themes;
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public readonly Widget child;
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public override Widget build(BuildContext context) {
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Widget wrappedChild = child;
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foreach (InheritedTheme theme in themes)
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wrappedChild = theme.wrap(context, wrappedChild);
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return wrappedChild;
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}
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}
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}
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