зеркало из https://github.com/DeGsoft/maui-linux.git
72 строки
2.5 KiB
C#
72 строки
2.5 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
|
|
namespace Xamarin.Forms
|
|
{
|
|
static class ResourcesExtensions
|
|
{
|
|
public static IEnumerable<KeyValuePair<string, object>> GetMergedResources(this IElement element)
|
|
{
|
|
Dictionary<string, object> resources = null;
|
|
while (element != null)
|
|
{
|
|
var ve = element as IResourcesProvider;
|
|
if (ve != null && ve.IsResourcesCreated)
|
|
{
|
|
resources = resources ?? new Dictionary<string, object>();
|
|
foreach (KeyValuePair<string, object> res in ve.Resources.MergedResources)
|
|
{
|
|
// If a MergedDictionary value is overridden for a DynamicResource,
|
|
// it comes out later in the enumeration of MergedResources
|
|
// TryGetValue ensures we pull the up-to-date value for the key
|
|
if (!resources.ContainsKey(res.Key) && ve.Resources.TryGetValue(res.Key, out object value))
|
|
resources.Add(res.Key, value);
|
|
else if (res.Key.StartsWith(Style.StyleClassPrefix, StringComparison.Ordinal))
|
|
{
|
|
var mergedClassStyles = new List<Style>(resources[res.Key] as List<Style>);
|
|
mergedClassStyles.AddRange(res.Value as List<Style>);
|
|
resources[res.Key] = mergedClassStyles;
|
|
}
|
|
}
|
|
}
|
|
var app = element as Application;
|
|
if (app != null && app.SystemResources != null)
|
|
{
|
|
resources = resources ?? new Dictionary<string, object>(8);
|
|
foreach (KeyValuePair<string, object> res in app.SystemResources)
|
|
if (!resources.ContainsKey(res.Key))
|
|
resources.Add(res.Key, res.Value);
|
|
else if (res.Key.StartsWith(Style.StyleClassPrefix, StringComparison.Ordinal))
|
|
{
|
|
var mergedClassStyles = new List<Style>(resources[res.Key] as List<Style>);
|
|
mergedClassStyles.AddRange(res.Value as List<Style>);
|
|
resources[res.Key] = mergedClassStyles;
|
|
}
|
|
}
|
|
element = element.Parent;
|
|
}
|
|
return resources;
|
|
}
|
|
|
|
public static bool TryGetResource(this IElement element, string key, out object value)
|
|
{
|
|
while (element != null)
|
|
{
|
|
var ve = element as IResourcesProvider;
|
|
if (ve != null && ve.IsResourcesCreated && ve.Resources.TryGetValue(key, out value))
|
|
return true;
|
|
var app = element as Application;
|
|
if (app != null && app.SystemResources != null && app.SystemResources.TryGetValue(key, out value))
|
|
return true;
|
|
element = element.Parent;
|
|
}
|
|
|
|
//Fallback for the XF previewer
|
|
if (Application.Current != null && ((IResourcesProvider)Application.Current).IsResourcesCreated && Application.Current.Resources.TryGetValue(key, out value))
|
|
return true;
|
|
|
|
value = null;
|
|
return false;
|
|
}
|
|
}
|
|
} |