/// <summary>
/// Condenses this range into the smallest well-formed state that still contains the same
/// text markup.
/// </summary>
/// <returns></returns>
public bool Trim()
{
MarkupPointer newStart = MarkupServices.CreateMarkupPointer(Start);
MarkupPointer newEnd = MarkupServices.CreateMarkupPointer(End);
MarkupContext context = new MarkupContext();
//set newStart adjacent to the first text element to its right
newStart.Right(true, context);
while (!HasContentBetween(Start, newStart) && newStart.IsLeftOf(End))
{
newStart.Right(true, context);
}
if (HasContentBetween(Start, newStart))
{
newStart.Left(true); //we overstepped the text, so back up one step
}
//set newEnd adjacent to the first text element to its left
newEnd.Left(true, context);
while (!HasContentBetween(newEnd, End) && newEnd.IsRightOf(Start))
{
newEnd.Left(true, context);
}
if (HasContentBetween(newEnd, End))
{
newEnd.Right(true); //we overstepped the text, so back up one step
}
IHTMLElement sharedParent = GetSharedParent(newStart, newEnd);
//span the start and end pointers as siblings by finding the parents of start and end
//pointers that are direct children of the sharedParent
IHTMLElement child = GetOuterMostChildOfParent(newStart, true, sharedParent);
if (child != null)
{
newStart.MoveAdjacentToElement(child, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
}
child = GetOuterMostChildOfParent(newEnd, false, sharedParent);
if (child != null)
{
newEnd.MoveAdjacentToElement(child, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
}
if (!HasContentBetween(newStart, Start) && !HasContentBetween(End, newEnd) &&
!(Start.IsEqualTo(newStart) && End.IsEqualTo(newEnd)))
{
Start.MoveToPointer(newStart);
End.MoveToPointer(newEnd);
return(true);
}
else
{
//the range didn't change, so return false.
return(false);
}
}
/// <summary>
/// Walk through the markup range in reverse, letting the walker visit each position.
/// </summary>
/// <param name="walker">the delegate walking navigating the the markup range</param>
/// <param name="inScopeElementsOnly">if true, enter/exit notifications about out-of-scope elements will be suppressed.</param>
/// <returns></returns>
public void WalkRangeReverse(MarkupRangeWalker walker, bool inScopeContextsOnly)
{
MarkupPointer p1 = MarkupServices.CreateMarkupPointer(End);
MarkupPointer p2 = MarkupServices.CreateMarkupPointer(End);
p1.Cling = false;
p2.Cling = false;
MarkupContext context = new MarkupContext();
bool continueWalking = true;
MarkupRange currentRange = null;
while (continueWalking && p2.IsRightOf(Start))
{
string text = null;
bool isInScope = true;
p2.Left(true, context);
currentRange = new MarkupRange(p2.Clone(), p1.Clone(), MarkupServices);
if (inScopeContextsOnly)
{
if (context.Element != null)
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope)
{
p1.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterEnd);
isInScope = InRange(p1);
}
else if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope)
{
p1.MoveAdjacentToElement(context.Element, _ELEMENT_ADJACENCY.ELEM_ADJ_BeforeBegin);
isInScope = InRange(p1);
}
}
else if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
// It's possible part of the text is out of scope, so only return the in-scope text.
if (currentRange.Start.IsLeftOf(Start))
{
currentRange.Start.MoveToPointer(Start);
}
}
}
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
text = currentRange.Text;
}
if (!inScopeContextsOnly || isInScope)
{
continueWalking = walker(currentRange, context, text);
}
p1.MoveToPointer(p2);
}
}
private static void MovePointer(MarkupPointer p, MoveDirection d, MarkupContext context)
{
if (d == MoveDirection.LEFT)
{
p.Left(true, context);
}
else
{
p.Right(true, context);
}
}
public override bool ShouldMoveDropLocationRight(MarkupPointer dropLocation)
{
MarkupContext mc = new MarkupContext();
dropLocation.Right(false, mc);
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope && ElementFilters.IsBlockElement(mc.Element) && !ContentSourceManager.IsSmartContent(mc.Element))
{
dropLocation.Left(false, mc);
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope && ElementFilters.IsBlockElement(mc.Element))
return true;
}
return false;
}
private MarkupPointer GetFirstTextPoint(MarkupPointer from, bool forward)
{
MarkupPointer firstTextPoint = from.Clone();
MarkupContext context = new MarkupContext();
bool keepLooking = true;
do
{
if (forward)
{
firstTextPoint.Right(false, context);
}
else
{
firstTextPoint.Left(false, context);
}
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
break;
}
if (forward)
{
firstTextPoint.Right(true, context);
keepLooking = context.Element != null && firstTextPoint.IsLeftOf(End);
}
else
{
firstTextPoint.Left(true, context);
keepLooking = context.Element != null && firstTextPoint.IsRightOf(Start);
}
} while (keepLooking);
return(firstTextPoint);
}
/// <summary>
/// Retrieve the parent of a child element that is closest to an outer parent element.
/// </summary>
/// <param name="from">the position to move move out from</param>
/// <param name="lookRight">if true, look right for the inner child to start from, otherwise look left</param>
/// <param name="outerParent">parent element to move out to</param>
/// <returns>the direct child of the outerparent that contains the innerChild</returns>
IHTMLElement GetOuterMostChildOfParent(MarkupPointer from, bool lookRight, IHTMLElement outerParent)
{
MarkupContext lookContext = new MarkupContext();
if (lookRight)
{
from.Right(false, lookContext);
}
else
{
from.Left(false, lookContext);
}
//if there is a new element coming into scope, start the search from there,
//otherwise, start from the currentScope.
IHTMLElement innerChild;
if (lookContext.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope)
{
innerChild = lookContext.Element;
}
else
{
innerChild = from.CurrentScope;
}
IHTMLElement parent = innerChild;
IHTMLElement innerParent = innerChild;
while (parent != outerParent && parent != null)
{
innerParent = parent;
parent = parent.parentElement;
}
Debug.Assert(innerParent != null, "Parent not found");
if (innerParent == outerParent) //occurs when the from pointer is position directly in the parent.
{
return(null);
}
return(innerParent);
}
private IHTMLElement GetNextElement(MarkupPointer start, MarkupRange boundaries, IHTMLElementFilter filter, bool forward)
{
start = start.Clone();
MarkupPointer boundary = forward ? boundaries.End : boundaries.Start;
MarkupContext moveResult = new MarkupContext();
_MARKUP_CONTEXT_TYPE skipContext = _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope;
//advance the pointer
if (forward)
start.Right(true, moveResult);
else
start.Left(true, moveResult);
while (forward ? start.IsLeftOf(boundary) : start.IsRightOf(boundary))
{
if (moveResult.Element != null && moveResult.Context != skipContext && filter(moveResult.Element))
{
return moveResult.Element;
}
//advance the pointer
if (forward)
start.Right(true, moveResult);
else
start.Left(true, moveResult);
}
return null;
}
/// <summary>
/// Retrieve the parent of a child element that is closest to an outer parent element.
/// </summary>
/// <param name="from">the position to move move out from</param>
/// <param name="lookRight">if true, look right for the inner child to start from, otherwise look left</param>
/// <param name="outerParent">parent element to move out to</param>
/// <returns>the direct child of the outerparent that contains the innerChild</returns>
IHTMLElement GetOuterMostChildOfParent(MarkupPointer from, bool lookRight, IHTMLElement outerParent)
{
MarkupContext lookContext = new MarkupContext();
if (lookRight)
from.Right(false, lookContext);
else
from.Left(false, lookContext);
//if there is a new element coming into scope, start the search from there,
//otherwise, start from the currentScope.
IHTMLElement innerChild;
if (lookContext.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope)
innerChild = lookContext.Element;
else
innerChild = from.CurrentScope;
IHTMLElement parent = innerChild;
IHTMLElement innerParent = innerChild;
while (parent != outerParent && parent != null)
{
innerParent = parent;
parent = parent.parentElement;
}
Debug.Assert(innerParent != null, "Parent not found");
if (innerParent == outerParent) //occurs when the from pointer is position directly in the parent.
{
return null;
}
return innerParent;
}
private static void MovePointer(MarkupPointer p, MoveDirection d, MarkupContext context)
{
if (d == MoveDirection.LEFT)
p.Left(true, context);
else
p.Right(true, context);
}
private void MovePointerRightUntilRegionBreak(MarkupPointer p, IHTMLElementFilter regionBreakFilter, MarkupPointer rightBoundary)
{
MarkupContext moveContext = new MarkupContext();
while (p.IsLeftOf(rightBoundary))
{
p.Right(true, moveContext);
if (moveContext.Element != null && regionBreakFilter(moveContext.Element))
{
p.Left(true);
return;
}
}
}
