XAML組合樣式

Question

我不是這個很有希望，但有什麼辦法複式風格在XAML結合起來，使具有所有所需設置一個新的風格？

例如（僞碼）;

<Style x:key="A"> 
... 
</Style> 

<Style x:key="B"> 
... 
</Style> 

<Style x:key="Combined"> 
<IncludeStyle Name="A"/> 
<IncludeStyle Name="B"/> 
... other properties. 
</Style> 

我知道，有一個「支持算法FMP」屬性的風格，但該功能只需要你這麼遠。我真的只是尋找一種簡單的方法（在XAML中）來創建這些「組合」風格。但就像我之前說過的，我懷疑它是否存在，除非有人聽說過這樣的事情？

Answer 1

您可以創建一個標記擴展，將合併的風格屬性，並觸發到一個單一的風格。

通過谷歌搜索結果來看，最流行的是從這個博客：http://bea.stollnitz.com/blog/?p=384

這將允許您合併使用CSS的語法風格。

例如：

<Window.Resources> 
    <Style TargetType="Button" x:Key="ButtonStyle"> 
     <Setter Property="Width" Value="120" /> 
     <Setter Property="Height" Value="25" /> 
     <Setter Property="FontSize" Value="12" /> 
    </Style> 
    <Style TargetType="Button" x:Key="GreenButtonStyle"> 
     <Setter Property="Foreground" Value="Green" /> 
    </Style> 
    <Style TargetType="Button" x:Key="RedButtonStyle"> 
     <Setter Property="Foreground" Value="Red" /> 
    </Style> 
    <Style TargetType="Button" x:Key="BoldButtonStyle"> 
     <Setter Property="FontWeight" Value="Bold" /> 
    </Style> 
</Window.Resources> 

<Button Style="{local:MultiStyle ButtonStyle GreenButtonStyle}" Content="Green Button" /> 
<Button Style="{local:MultiStyle ButtonStyle RedButtonStyle}" Content="Red Button" /> 
<Button Style="{local:MultiStyle ButtonStyle GreenButtonStyle BoldButtonStyle}" Content="green, bold button" /> 
<Button Style="{local:MultiStyle ButtonStyle RedButtonStyle BoldButtonStyle}" Content="red, bold button" /> 

你也可以定義新的樣式，被合併的風格。

你的榜樣將通過去解決：

<Style x:key="Combined" BasedOn="{local:MultiStyle A B}"> 
     ... other properties. 
</Style> 

所有你需要做的就是添加這個類做你的命名空間，你就大功告成了：

[MarkupExtensionReturnType(typeof(Style))] 
public class MultiStyleExtension : MarkupExtension 
{ 
    private string[] resourceKeys; 

    /// <summary> 
    /// Public constructor. 
    /// </summary> 
    /// <param name="inputResourceKeys">The constructor input should be a string consisting of one or more style names separated by spaces.</param> 
    public MultiStyleExtension(string inputResourceKeys) 
    { 
     if (inputResourceKeys == null) 
      throw new ArgumentNullException("inputResourceKeys"); 
     this.resourceKeys = inputResourceKeys.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); 
     if (this.resourceKeys.Length == 0) 
      throw new ArgumentException("No input resource keys specified."); 
    } 

    /// <summary> 
    /// Returns a style that merges all styles with the keys specified in the constructor. 
    /// </summary> 
    /// <param name="serviceProvider">The service provider for this markup extension.</param> 
    /// <returns>A style that merges all styles with the keys specified in the constructor.</returns> 
    public override object ProvideValue(IServiceProvider serviceProvider) 
    { 
     Style resultStyle = new Style(); 
     foreach (string currentResourceKey in resourceKeys) 
     { 
      object key = currentResourceKey; 
      if (currentResourceKey == ".") 
      { 
       IProvideValueTarget service = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget)); 
       key = service.TargetObject.GetType(); 
      } 
      Style currentStyle = new StaticResourceExtension(key).ProvideValue(serviceProvider) as Style; 
      if (currentStyle == null) 
       throw new InvalidOperationException("Could not find style with resource key " + currentResourceKey + "."); 
      resultStyle.Merge(currentStyle); 
     } 
     return resultStyle; 
    } 
} 

public static class MultiStyleMethods 
{ 
    /// <summary> 
    /// Merges the two styles passed as parameters. The first style will be modified to include any 
    /// information present in the second. If there are collisions, the second style takes priority. 
    /// </summary> 
    /// <param name="style1">First style to merge, which will be modified to include information from the second one.</param> 
    /// <param name="style2">Second style to merge.</param> 
    public static void Merge(this Style style1, Style style2) 
    { 
     if(style1 == null) 
      throw new ArgumentNullException("style1"); 
     if(style2 == null) 
      throw new ArgumentNullException("style2"); 
     if(style1.TargetType.IsAssignableFrom(style2.TargetType)) 
      style1.TargetType = style2.TargetType; 
     if(style2.BasedOn != null) 
      Merge(style1, style2.BasedOn); 
     foreach(SetterBase currentSetter in style2.Setters) 
      style1.Setters.Add(currentSetter); 
     foreach(TriggerBase currentTrigger in style2.Triggers) 
      style1.Triggers.Add(currentTrigger); 
     // This code is only needed when using DynamicResources. 
     foreach(object key in style2.Resources.Keys) 
      style1.Resources[key] = style2.Resources[key]; 
    } 
} 

如果您使用上面的代碼，這些代碼是從原來的博客上稍微修改而來的，您可以另外使用當前的默認樣式進行類型合併，使用「。」。語法：

<Button Style="{local:MultiStyle . GreenButtonStyle BoldButtonStyle}"/> 

以上將合併TargetType="{x:Type Button}"的默認樣式與兩種補充樣式。