我对此并不是很有希望,但有没有办法在XAML中组合多种样式来制作具有所有所需设置的新样式?
例如(伪代码);
<Style x:key="A">
...
</Style>
<Style x:key="B">
...
</Style>
<Style x:key="Combined">
<IncludeStyle Name="A"/>
<IncludeStyle Name="B"/>
... other properties.
</Style>
我知道样式有一个'BasedOn'属性,但该功能只会带你到目前为止。我真的只是在寻找一种简单的方法(在XAML中)来创建这些“组合”样式。但就像我之前说过的那样,我怀疑它是否存在,除非有人听说过这样的事情?
答案 0 :(得分:50)
您可以创建一个标记扩展,将样式属性和触发器合并为一种样式。
根据谷歌搜索结果,最受欢迎的是来自此博客:http://bea.stollnitz.com/blog/?p=384
这将允许您使用类似CSS的语法合并样式。
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" />
您还可以将新样式定义为合并样式。
您的示例将通过以下方式解决:
<Style x:key="Combined" BasedOn="{local:MultiStyle A B}">
... other properties.
</Style>
你需要做的就是添加这个类做你的命名空间,然后你就开始运行了:
[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];
}
}
如果你使用上面的代码,它稍微修改了博客上的原始代码,你可以另外使用当前默认样式的类型可以使用“。”合并。语法:
<Button Style="{local:MultiStyle . GreenButtonStyle BoldButtonStyle}"/>
以上内容将TargetType="{x:Type Button}"
的默认样式与两个补充样式合并。
答案 1 :(得分:0)
您可以使用样式中的 BasedOn 属性,例如:
<Style x:Key="BaseButtons" TargetType="{x:Type Button}">
<Setter Property="BorderThickness" Value="0"></Setter>
<Setter Property="Background" Value="Transparent"></Setter>
<Setter Property="Cursor" Value="Hand"></Setter>
<Setter Property="VerticalAlignment" Value="Center"></Setter>
</Style>
<Style x:Key="ManageButtons" TargetType="{x:Type Button}" BasedOn="{StaticResource BaseManageLabButtons}">
<Setter Property="Height" Value="50"></Setter>
<Setter Property="Width" Value="50"></Setter>
</Style>
<Style x:Key="ManageStartButton" TargetType="{x:Type Button}" BasedOn="{StaticResource BaseManageLabButtons}">
<Setter Property="FontSize" Value="16"></Setter>
</Style>
并使用:
<Button Style="{StaticResource ManageButtons}"></Button>
<Button Style="{StaticResource ManageStartButton}"></Button>