[英]Pendant for Nested Styles (like CSS) in Silverlight instead of WPF
我的任務是在每個StackPanel中嵌套的每個Button上設置20px的邊距。
在WPF中,我在Application.Resources中使用以下代碼:
<Style TargetType="StackPanel">
<Style.Resources>
<Style TargetType="Button">
<Setter Property="Margin" Value="20" />
</Style>
</Style.Resources>
</Style>
在Silverlight中,缺少“ Style.Resources”標簽。 但是我嘗試了這段代碼:
<Style TargetType="StackPanel">
<Setter Property="Resources">
<Setter.Value>
<ResourceDictionary>
<Style TargetType="Button">
<Setter Property="Margin" Value="20" />
</Style>
</ResourceDictionary>
</Setter.Value>
</Setter>
</Style>
可悲的是,在Silverlight方面沒有任何反應(沒有錯誤,沒有結果)。
有誰知道在Silverlight中是否可能沒有手動在每個Stackpanel上通過鍵設置樣式?
在Silverlight中,不能簡單地完成,可以使用附加的依賴項屬性來完成。 這是此類屬性,可以執行您想要的操作-將條目添加到元素ResourceDictionaries。
namespace SilverlightApplication1.Assets
{
public class Utils : DependencyObject
{
public static readonly DependencyProperty AdditionalResourcesProperty = DependencyProperty.RegisterAttached(
"AdditionalResources", typeof(ResourceDictionary), typeof(Utils), new PropertyMetadata(null, OnAdditionalResourcesPropertyChanged));
public static ResourceDictionary GetAdditionalResources(FrameworkElement obj)
{
return (ResourceDictionary)obj.GetValue(AdditionalResourcesProperty);
}
public static void SetAdditionalResources(FrameworkElement obj, ResourceDictionary value)
{
obj.SetValue(AdditionalResourcesProperty, value);
}
private static void OnAdditionalResourcesPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FrameworkElement element = d as FrameworkElement;
if (element == null)
return;
ResourceDictionary oldValue = e.OldValue as ResourceDictionary;
if (oldValue != null)
{
foreach (DictionaryEntry entry in oldValue)
{
if (element.Resources.Contains(entry.Key) && element.Resources[entry.Key] == entry.Value)
element.Resources.Remove(entry.Key);
}
}
ResourceDictionary newValue = e.NewValue as ResourceDictionary;
if (newValue != null)
{
foreach(DictionaryEntry entry in newValue)
{
element.Resources.Add(entry.Key, entry.Value);
}
}
}
}
}
它的用法與您已經嘗試過的非常相似:
<Style TargetType="StackPanel">
<Setter Property="assets:Utils.AdditionalResources">
<Setter.Value>
<ResourceDictionary>
<Style TargetType="Button">
<Setter Property="Margin" Value="20" />
</Style>
</ResourceDictionary>
</Setter.Value>
</Setter>
</Style>
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