public virtual void Clear() {
OldRange = TextRange.EmptyRange;
NewRange = TextRange.EmptyRange;
OldText = null;
NewText = null;
}
public CharacterStream(ITextProvider textProvider, ITextRange range) {
_text = textProvider;
int end = Math.Min(_text.Length, range.End);
_range = TextRange.FromBounds(range.Start, end);
Position = _range.Start;
_currentChar = _text[_range.Start];
}
/// <summary>
/// Determines if range contains all ranges in a collection
/// </summary>
public static bool Contains(ITextRange range, IEnumerable<ITextRange> ranges) {
var textRange = new TextRange(range);
return textRange.Contains(ranges);
}
/// <summary>
/// Determines if range contains another range
/// </summary>
public static bool Contains(ITextRange range, ITextRange other) {
var textRange = new TextRange(range);
return textRange.Contains(other);
}
public void Combine(TextChange other) {
if (other.IsEmpty())
return;
if (OldRange == TextRange.EmptyRange || NewRange == TextRange.EmptyRange) {
OldRange = other.OldRange;
NewRange = other.NewRange;
} else {
int oldStart = Math.Min(other.OldRange.Start, this.OldRange.Start);
int oldEnd = Math.Max(other.OldRange.End, this.OldRange.End);
int newStart = Math.Min(other.NewRange.Start, this.NewRange.Start);
int newEnd = Math.Max(other.NewRange.End, this.NewRange.End);
this.OldRange = new TextRange(oldStart, oldEnd);
this.NewRange = new TextRange(newStart, newEnd);
}
Version = Math.Max(this.Version, other.Version);
}
public TextChange(int start, int oldLength, int newLength) :
this() {
OldRange = new TextRange(start, start + oldLength);
NewRange = new TextRange(start, start + newLength);
}
public IList <T> ItemsInRange(int start)
{
return(_collection.ItemsInRange(TextRange.FromBounds(start, start)));
}
public CharacterStream(ITextProvider textProvider)
: this(textProvider, TextRange.FromBounds(0, textProvider.Length))
{
}