/// <summary>
/// Returns true if the the range contains an element that matches the filter
/// </summary>
/// <param name="filter"></param>
/// <returns></returns>
public bool ContainsElements(IHTMLElementFilter filter)
{
if (!IsEmpty())
{
Hashtable usedElements = new Hashtable();
MarkupPointer p = MarkupServices.CreateMarkupPointer(Start);
MarkupContext context = p.Right(false);
//move p through the range to locate each the elements adding elements that pass the filter
while (p.IsLeftOfOrEqualTo(End))
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope ||
context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope ||
context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope)
{
if (usedElements[context.Element] == null)
{
if (filter(context.Element))
{
return(true);
}
}
//cache the fact that we've already tested this element.
usedElements[context.Element] = context.Element;
}
p.Right(true, context);
}
}
return(false);
}
/// <summary>
/// Returns true if the specified element begins and ends within the range.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
private bool isInScope(IHTMLElement e)
{
MarkupPointer p = MarkupServices.CreateMarkupPointer(e, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
if (p.IsRightOfOrEqualTo(Start))
{
p = MarkupServices.CreateMarkupPointer(e, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
if (p.IsLeftOfOrEqualTo(End))
{
return(true);
}
}
return(false);
}
//this is similar to the GetTopLevelElements except will also return table cells if correct filter
// is set and recurse is equal to true
public IHTMLElement[] GetTopLevelBlocksAndCells(IHTMLElementFilter filter, bool recurse)
{
ArrayList list = new ArrayList();
Hashtable usedElements = new Hashtable();
MarkupPointer p = MarkupServices.CreateMarkupPointer(Start);
MarkupContext context = p.Right(false);
//move p through the range to locate each of the top level elements
while (p.IsLeftOf(End))
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope || context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope)
{
p.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
if (usedElements[context.Element] == null)
{
if (p.IsLeftOfOrEqualTo(End) && (filter == null || filter(context.Element)))
{
list.Add(context.Element);
}
//special case--inside of a table element, want to get out the cells inside
else if (recurse && ElementFilters.TABLE_ELEMENTS(context.Element))
{
MarkupRange newRange = MarkupServices.CreateMarkupRange(context.Element);
newRange.Start.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterBegin);
if (newRange.Start.IsLeftOf(Start))
{
newRange.Start.MoveToPointer(Start);
}
if (newRange.End.IsRightOf(End))
{
newRange.End.MoveToPointer(End);
}
//recursively check inside table element for table cells
list.AddRange(newRange.GetTopLevelBlocksAndCells(filter, true));
}
//cache the fact that we've already tested this element.
usedElements[context.Element] = context.Element;
}
}
p.Right(true, context);
}
return(HTMLElementHelper.ToElementArray(list));
}
/// <summary>
/// Gets the elements in the range that match the filter.
/// </summary>
/// <param name="filter">the delegate testing each element to determine if it should be added to the list of elements to return</param>
/// <param name="inScopeElementsOnly">if true, the only</param>
/// <returns></returns>
public IHTMLElement[] GetElements(IHTMLElementFilter filter, bool inScopeElementsOnly)
{
ArrayList list = new ArrayList();
if (!IsEmpty())
{
Hashtable usedElements = new Hashtable();
MarkupPointer p = MarkupServices.CreateMarkupPointer(Start);
MarkupPointer end = MarkupServices.CreateMarkupPointer(End);
MarkupContext context = p.Right(false);
//move p through the range to locate each the elements adding elements that pass the filter
while (p.IsLeftOfOrEqualTo(end))
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope ||
context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope ||
context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope)
{
if (usedElements[context.Element] == null)
{
if ((inScopeElementsOnly && isInScope(context.Element)) || !inScopeElementsOnly)
{
if (filter(context.Element))
{
list.Add(context.Element);
}
}
//cache the fact that we've already tested this element.
usedElements[context.Element] = context.Element;
}
}
p.Right(true, context);
}
}
return(HTMLElementHelper.ToElementArray(list));
}
/// <summary>
/// Returns true if the specified pointer is in a position between, or equal to the start/end points.
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
private static bool isInRange(MarkupPointer start, MarkupPointer end, MarkupPointer p)
{
return(start.IsLeftOfOrEqualTo(p) && end.IsRightOfOrEqualTo(p));
}
/// <summary>
/// Returns true if the specified pointer is in a position between, or equal to the start/end points.
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
private static bool isInRange(MarkupPointer start, MarkupPointer end, MarkupPointer p)
{
return start.IsLeftOfOrEqualTo(p) && end.IsRightOfOrEqualTo(p);
}
