// Attach non-breaking elements to the text or object on
// their left.
internal static bool MoveNaviBackward(TextNavigator nav)
{
TextSymbolType type;
bool continueLoop = true;
TextPosition position = nav.CreatePosition();
type = nav.GetSymbolType(LogicalDirection.Backward);
while (continueLoop)
{
if (nav.CompareTo(nav.TextContainer.Start) == 0)
{
return(false);
}
switch (type)
{
case TextSymbolType.Character:
case TextSymbolType.EmbeddedObject:
continueLoop = false;
break;
case TextSymbolType.ElementStart:
case TextSymbolType.ElementEnd:
if (IsBreakingSymbol(nav, LogicalDirection.Backward))
{
continueLoop = false;
}
break;
}
nav.MoveByDistance(-1);
type = nav.GetSymbolType(LogicalDirection.Backward);
}
return(nav.CompareTo(position) < 0);
}
internal bool BreakText(TextPosition start, TextPosition end, bool isSpelling, out ArrayList positionList)
{
string breakingString;
ArrayList indexList;
int currentIndex = 0;
int lastIndex = 0;
int i;
TextNavigator nav = start.CreateNavigator();
positionList = null;
// Convert input and execute main work.
if (nav.CompareTo(nav.TextContainer.Start) != 0)
{
MoveNaviBackward(nav);
MoveNaviForward(nav);
}
breakingString = GenerateText(nav, end);
if (!BreakText(breakingString, isSpelling, out indexList))
{
return(false);
}
// Convert from indices to TextPositions and return.
positionList = new ArrayList();
if (0 == start.CompareTo(start.TextContainer.Start))
{
positionList.Add(start);
}
foreach (Object item in indexList)
{
currentIndex = (int)item;
for (i = 0; i < (currentIndex - lastIndex); ++i)
{
MoveNaviForward(nav);
}
positionList.Add(nav.CreatePosition());
lastIndex = currentIndex;
}
if (0 == end.CompareTo(end.TextContainer.End))
{
// Add the end of the container as the last break.
positionList.Add(end);
}
return(true);
}