/// <summary>
/// 创建 Css21StyleSpecification 对象
/// </summary>
public Css21StyleSpecification()
{
StyleShorthandRules.Add(new StandardBoxShorthandRule("padding"));
StyleShorthandRules.Add(new StandardBoxShorthandRule("margin"));
StyleShorthandRules.Add(new StandardBoxShorthandRule("border-width"));
StyleShorthandRules.Add(new StandardBoxShorthandRule("border-style"));
StyleShorthandRules.Add(new StandardBoxShorthandRule("border-color"));
}
/// <summary>
/// 获取缩写形式的样式属性
/// </summary>
/// <param name="name">样式属性名</param>
/// <param name="style">所有的样式设置</param>
/// <returns>返回缩写形式，如果可能</returns>
public CssStyleProperty TryGetShorthandProperty(string name, CssStyle style)
{
if (StyleShorthandRules.Contains(name))
{
var rule = StyleShorthandRules[name];
return(rule.TryGetShorthandProperty(style));
}
else
{
return(null);
}
}
/// <summary>
/// 展开 CSS 样式属性的缩写形式
/// </summary>
/// <param name="property">样式属性设置</param>
/// <returns>展开后的形式，若该设置不是缩写形式，则原样返回</returns>
protected virtual IEnumerable <CssStyleProperty> ExtractShorthand(CssStyleProperty property)
{
lock ( SyncRoot )
{
if (StyleShorthandRules.Contains(property.Name))
{
return(StyleShorthandRules[property.Name].ExtractProperties(property.Value));
}
else
{
return new[] { property }
};
}
}
/// <summary>
/// 检查指定的样式属性是否为一个缩写形式
/// </summary>
/// <param name="name">指定的属性名</param>
/// <returns>是否为缩写形式</returns>
public bool IsShorthandStyle(string name)
{
return(StyleShorthandRules.Contains(name));
}
