private void DeleteChars(int pos, int l)
{
if (l == 0)
{
return;
}
UserText = UserText.Substring(0, pos) + UserText.Substring(pos + l);
}
private bool InsertChar(int pos, char ch)
{
if (string.IsNullOrEmpty(Text))
{
UserText = ch.ToString();
}
else
{
UserText = UserText.Substring(0, pos) + ch + UserText.Substring(pos);
}
return(true);
}
private bool InsertChars(int pos, string s)
{
if (string.IsNullOrEmpty(s))
{
return(false);
}
if (string.IsNullOrEmpty(Text))
{
UserText = s;
}
else
{
UserText = UserText.Substring(0, pos) + s + UserText.Substring(pos);
}
return(true);
}
public void Replace(int where, int len, string text)
{
if (len <= 0)
{
Insert(where, text);
return;
}
text = Process(text);
if (string.IsNullOrEmpty(text))
{
Delete(where, len);
return;
}
UndoStack.MakeReplace(Text, where, len, text.Length);
UserText = UserText.Substring(0, where) + text + UserText.Substring(where + len);
}
protected void DeleteCharacter()
{
if (UserText.Length >= 1)
{
UserText = UserText.Substring(0, UserText.Length - 1);
if (Building.Text.Length == 0 && Runs.Count > 0)
{
Building = Runs.Last.Value;
Runs.RemoveLast();
}
if (Building.Text.Length > 0)
{
Building.Text = Building.Text.Substring(0, Building.Text.Length - 1);
}
UpdateParagraph();
}
}