/// <summary>
/// Initializes a new instance of the <see cref="TextBoxLine"/> class.
/// </summary>
/// <param name="owner">The <see cref="TextBoxLines"/> this line is part of.</param>
/// <param name="wasAutoBroken">if this <see cref="TextBoxLine"/> was created as the result of automatic line
/// breaking due to word wrapping.</param>
public TextBoxLine(TextBoxLines owner, bool wasAutoBroken = false)
{
TextBoxLines = owner;
_wasAutoBroken = wasAutoBroken;
_lineText = string.Empty;
_texts = new List<StyledText>(4);
}
/// <summary>
/// Initializes a new instance of the <see cref="TextBoxLine"/> class.
/// </summary>
/// <param name="owner">The <see cref="TextBoxLines"/> this line is part of.</param>
/// <param name="wasAutoBroken">if this <see cref="TextBoxLine"/> was created as the result of automatic line
/// breaking due to word wrapping.</param>
public TextBoxLine(TextBoxLines owner, bool wasAutoBroken = false)
{
TextBoxLines = owner;
_wasAutoBroken = wasAutoBroken;
_lineText = string.Empty;
_texts = new List <StyledText>(4);
}
/// <summary>
/// Appends styled text to the line.
/// </summary>
/// <param name="text">The text to append.</param>
public void Append(StyledText text)
{
InternalAppend(text);
if (TextBoxLines != null)
{
TextBoxLines.NotifyTextAdded(this);
}
}
/// <summary>
/// Appends styled text to the line.
/// </summary>
/// <param name="texts">The texts to append.</param>
public void Append(IEnumerable <StyledText> texts)
{
foreach (var text in texts)
{
InternalAppend(text);
}
if (TextBoxLines != null)
{
TextBoxLines.NotifyTextAdded(this);
}
}
/// <summary>
/// Appends another <see cref="TextBoxLine"/> to this <see cref="TextBoxLine"/>.
/// </summary>
/// <param name="textBoxLine">The other <see cref="TextBoxLine"/> to append to this.</param>
public void Append(TextBoxLine textBoxLine)
{
for (var i = 0; i < textBoxLine._texts.Count; i++)
{
InternalAppend(textBoxLine._texts[i]);
}
if (TextBoxLines != null)
{
TextBoxLines.NotifyTextAdded(this);
}
}
/// <summary>
/// Inserts the <see cref="text"/> into the line at the specified position.
/// </summary>
/// <param name="position">The 0-based index to insert the <see cref="text"/>. The text
/// will be inserted before the character in the line whos index is equal to the position. For example,
/// inserting at position 3 will insert between the 3rd and 4th character of the string. As such,
/// position 0 will insert at the start of the string, and the length of the string will insert
/// at the end. If the position is invalid, this method will always return false.</param>
/// <param name="text">The character to insert.</param>
/// <returns>True if the <paramref name="text"/> was inserted successfully; otherwise false.</returns>
public bool Insert(StyledText text, int position)
{
if (position < 0 || position > _lineText.Length)
{
return(false);
}
if (position == 0)
{
// Insert at the start
var first = _texts.Count > 0 ? _texts[0] : null;
if (first != null)
{
// Try to combine the texts
if (text.HasSameStyle(first))
{
_texts[0] = text + first.Text;
}
else
{
_texts.Insert(0, text);
}
}
else
{
_texts.Add(text);
}
_lineText = text.Text + _lineText;
}
else if (position == _lineText.Length)
{
// Insert at the end
var last = _texts.Count > 0 ? _texts[_texts.Count - 1] : null;
if (last != null)
{
// Try to combine the texts
if (text.HasSameStyle(last))
{
_texts[_texts.Count - 1] = last + text.Text;
}
else
{
_texts.Add(text);
}
}
else
{
_texts.Add(text);
}
_lineText += text.Text;
}
else
{
// Somewhere in the middle
// Get the StyledText containing the character to insert before
StyledText subText;
int subTextIndex;
int listIndex;
try
{
FindLineCharacter(position, out subText, out subTextIndex, out listIndex);
}
catch (ArgumentOutOfRangeException)
{
return(false);
}
// Try to combine the texts
if (text.HasSameStyle(subText))
{
var combined = string.Empty;
if (subTextIndex > 0)
{
combined += subText.Text.Substring(0, subTextIndex);
}
combined += text.Text;
combined += subText.Text.Substring(subTextIndex);
_texts[listIndex] = new StyledText(combined, text);
}
else
{
if (subTextIndex == 0)
{
// Don't need to split up the existing StyledText (inserts whole thing before)
_texts.Insert(listIndex, text);
}
else
{
// Have to split apart the existing StyledText and insert the new one in between
// the split up parts
var firstPart = subText.Substring(0, subTextIndex);
var secondPart = subText.Substring(subTextIndex);
_texts[listIndex] = secondPart;
_texts.Insert(listIndex, text);
_texts.Insert(listIndex, firstPart);
}
}
_lineText = _lineText.Substring(0, position) + text.Text + _lineText.Substring(position);
}
EnsureCacheMatchesActualText();
if (TextBoxLines != null)
{
TextBoxLines.NotifyTextAdded(this);
}
return(true);
}
