//-----------------------------------------------------
//
// ITextRange Methods
//
//-----------------------------------------------------
#region ITextRange Methods
//......................................................
//
// Selection Building
//
//......................................................
/// <summary>
/// </summary>
//
internal static bool Contains(ITextRange thisRange, ITextPointer textPointer)
{
NormalizeRange(thisRange);
if (textPointer == null)
{
throw new ArgumentNullException("textPointer");
}
if (textPointer.TextContainer != thisRange.Start.TextContainer)
{
throw new ArgumentException(SR.Get(SRID.NotInAssociatedTree), "textPointer");
}
// Correct position normalization on range boundary so that
// our test would not depend on what side of formatting tags
// pointer is located.
if (textPointer.CompareTo(thisRange.Start) < 0)
{
textPointer = textPointer.GetFormatNormalizedPosition(LogicalDirection.Forward);
}
else if (textPointer.CompareTo(thisRange.End) > 0)
{
textPointer = textPointer.GetFormatNormalizedPosition(LogicalDirection.Backward);
}
// Check if at least one segment contains this position.
for (int i = 0; i < thisRange._TextSegments.Count; i++)
{
if (thisRange._TextSegments[i].Contains(textPointer))
{
return true;
}
}
return false;
}
// Normalizes a range:
//
// -The start position is advanced over all element edges not visible
// to the IMEs.
// -Start and end positions are moved to insertion positions.
private void GetNormalizedRange(int startCharOffset, int endCharOffset, out ITextPointer start, out ITextPointer end)
{
start = CreatePointerAtCharOffset(startCharOffset, LogicalDirection.Forward);
end = (startCharOffset == endCharOffset) ? start : CreatePointerAtCharOffset(endCharOffset, LogicalDirection.Backward);
// Skip over hidden element edges.
while (start.CompareTo(end) < 0)
{
TextPointerContext forwardContext = start.GetPointerContext(LogicalDirection.Forward);
if (forwardContext == TextPointerContext.ElementStart)
{
TextElement element = start.GetAdjacentElement(LogicalDirection.Forward) as TextElement;
if (element == null)
break;
if (element.IMELeftEdgeCharCount != 0)
break;
}
else if (forwardContext != TextPointerContext.ElementEnd)
{
break;
}
start.MoveToNextContextPosition(LogicalDirection.Forward);
}
// Move to insertion positions.
// If the positions are already adjacent to text, we must respect
// the IME's decision in regards to exact placement.
// MoveToInsertionPosition will skip over surrogates and combining
// marks, but the IME needs fine-grained control over these positions.
if (start.CompareTo(end) == 0)
{
start = start.GetFormatNormalizedPosition(LogicalDirection.Backward);
end = start;
}
else
{
start = start.GetFormatNormalizedPosition(LogicalDirection.Backward);
end = end.GetFormatNormalizedPosition(LogicalDirection.Backward);
}
}
private static ITextPointer GetNormalizedPosition(ITextRange thisRange, ITextPointer position, LogicalDirection direction)
{
ITextPointer normalizedPosition;
if (thisRange.IgnoreTextUnitBoundaries)
{
normalizedPosition = position.GetFormatNormalizedPosition(direction);
}
else
{
normalizedPosition = position.GetInsertionPosition(direction);
}
return normalizedPosition;
}
