67 строки
2.2 KiB
C#
67 строки
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Xamarin.Forms
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{
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static class ResourcesExtensions
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{
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public static IEnumerable<KeyValuePair<string, object>> GetMergedResources(this IElement element)
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{
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Dictionary<string, object> resources = null;
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while (element != null)
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{
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var ve = element as IResourcesProvider;
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if (ve != null && ve.Resources != null)
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{
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resources = resources ?? new Dictionary<string, object>();
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foreach (KeyValuePair<string, object> res in ve.Resources.MergedResources)
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if (!resources.ContainsKey(res.Key))
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resources.Add(res.Key, res.Value);
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else if (res.Key.StartsWith(Style.StyleClassPrefix, StringComparison.Ordinal))
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{
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var mergedClassStyles = new List<Style>(resources[res.Key] as List<Style>);
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mergedClassStyles.AddRange(res.Value as List<Style>);
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resources[res.Key] = mergedClassStyles;
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}
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}
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var app = element as Application;
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if (app != null && app.SystemResources != null)
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{
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resources = resources ?? new Dictionary<string, object>(8);
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foreach (KeyValuePair<string, object> res in app.SystemResources)
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if (!resources.ContainsKey(res.Key))
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resources.Add(res.Key, res.Value);
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else if (res.Key.StartsWith(Style.StyleClassPrefix, StringComparison.Ordinal))
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{
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var mergedClassStyles = new List<Style>(resources[res.Key] as List<Style>);
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mergedClassStyles.AddRange(res.Value as List<Style>);
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resources[res.Key] = mergedClassStyles;
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}
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}
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element = element.Parent;
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}
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return resources;
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}
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public static bool TryGetResource(this IElement element, string key, out object value)
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{
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while (element != null)
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{
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var ve = element as IResourcesProvider;
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if (ve != null && ve.Resources != null && ve.Resources.TryGetValue(key, out value))
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return true;
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var app = element as Application;
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if (app != null && app.SystemResources != null && app.SystemResources.TryGetValue(key, out value))
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return true;
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element = element.Parent;
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}
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//Fallback for the XF previewer
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if (Application.Current != null && Application.Current.Resources != null && Application.Current.Resources.TryGetValue(key, out value))
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return true;
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value = null;
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return false;
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}
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}
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} |