/// <summary>
/// 发现容器中所有可能是控件的元素并包装成控件返回
/// </summary>
/// <param name="form">控件所属的表单</param>
/// <param name="container">要搜索的容器</param>
/// <returns>找到的控件</returns>
protected virtual IEnumerable <IFormControl> DiscoveryControls(HtmlForm form, IHtmlContainer container)
{
//UNDONE 没有检查 name 是否包含特殊字符
foreach (var element in container.Elements())
{
if (inputTextSelector.IsEligible(element))
{
yield return(new HtmlInputText(form, element));
}
else if (textareaSelector.IsEligible(element))
{
yield return(new HtmlTextArea(form, element));
}
else if (selectControlSelector.IsEligible(element))
{
yield return(new HtmlSelect(form, element));
}
else
{
foreach (var control in DiscoveryControls(form, element))
{
yield return(control);
}
}
}
}
/// <summary>
/// 检查元素是否符合指定选择器要求，并缓存结果于元素当前文档版本
/// </summary>
/// <param name="selector">选择器</param>
/// <param name="element">元素</param>
/// <returns>是否符合选择器要求</returns>
public static bool IsEligibleBuffered(this ISelector selector, IHtmlElement element)
{
if (selector == null)
{
throw new ArgumentNullException("selector");
}
if (element == null)
{
return(selector.IsEligible(element));
}
var cacheContainer = element.Document as IVersionCacheContainer;
if (cacheContainer == null)
{
return(selector.IsEligible(element));
}
lock (cacheContainer.SyncRoot)
{
var cache = cacheContainer.CurrenctVersionCache[selector] as Dictionary <IHtmlElement, bool>;
if (cache != null)
{
bool result;
if (cache.TryGetValue(element, out result))
{
return(result);
}
}
else
{
cacheContainer.CurrenctVersionCache[selector] = cache = new Dictionary <IHtmlElement, bool>();
}
return(cache[element] = selector.IsEligible(element));
}
}
/// <summary>
/// 派生类重写此方法确定指定元素是否需要重写渲染规则
/// </summary>
/// <param name="element">要检测的元素</param>
/// <returns>是否需要使用自定义渲染规则</returns>
protected virtual bool IsEligible( IHtmlElement element )
{
if ( CssSelector == null )
return false;
if ( _selectorExpression == CssSelector )
return _selectorCache.IsEligible( element );
_selectorExpression = CssSelector;
_selectorCache = CssParser.ParseSelector( CssSelector );
return _selectorCache.IsEligible( element );
}
protected override bool IsEligibleCore(IHtmlElement element)
{
return(_selector.IsEligible(element));
}
