/// <summary>
/// Splits the text in this <see cref="TextBoxLine"/> at the given character index in the line.
/// </summary>
/// <param name="lineCharacterIndex">The index of the character to split the line at. This character
/// at this index will be the first character on the new line.</param>
/// <param name="currentLine">A <see cref="TextBoxLine"/> representing the remainder of the current
/// line (the one the split initially was made on).</param>
/// <param name="nextLine">A <see cref="TextBoxLine"/> representing the additional line created
/// from the split.</param>
public void SplitAt(int lineCharacterIndex, out TextBoxLine currentLine, out TextBoxLine nextLine)
{
if (lineCharacterIndex == 0)
{
// Split at the start of the line
// First line is empty, second line is the full line
currentLine = new TextBoxLine(TextBoxLines);
nextLine = this;
return;
}
else if (lineCharacterIndex == LineText.Length)
{
// Split at the end of the line
// First line is the full line, second line is empty
currentLine = this;
nextLine = new TextBoxLine(TextBoxLines);
return;
}
else
{
// Split up somewhere in the middle
// Find the StyledText for the character
StyledText text;
int textIndex;
int listIndex;
FindLineCharacter(lineCharacterIndex, out text, out textIndex, out listIndex);
// Split the StyledText
StyledText left;
StyledText right;
text.SplitAt(textIndex, out left, out right);
// The first line will be all the StyledTexts before the one split, plus the left side of the split
// The second line will be the right side of the split, plus all the StyledTexts after the one split
currentLine = new TextBoxLine(TextBoxLines);
for (var i = 0; i < listIndex; i++)
{
currentLine.Append(_texts[i]);
}
currentLine.Append(left);
nextLine = new TextBoxLine(TextBoxLines);
nextLine.Append(right);
for (var i = listIndex + 1; i < _texts.Count; i++)
{
nextLine.Append(_texts[i]);
}
}
}
/// <summary>
/// Appends the <paramref name="text"/> to the <see cref="TextBox"/> at the end.
/// </summary>
/// <param name="text">The text to append.</param>
public void Append(StyledText text)
{
if (text.Text.Length == 0)
{
return;
}
if (!IsMultiLine)
{
_lines.LastLine.Append(text.ToSingleline());
}
else
{
var textLines = StyledText.ToMultiline(text);
_lines.LastLine.Append(textLines[0]);
for (var i = 1; i < textLines.Count; i++)
{
var newLine = new TextBoxLine(_lines);
_lines.Insert(_lines.Count, newLine);
newLine.Append(textLines[i]);
}
TruncateIfNeeded();
}
_numCharsToDraw.Invalidate();
_hasTextChanged = true;
}
/// <summary>
/// A callback for the <see cref="TextBoxLine"/> to notify this <see cref="TextBoxLines"/> that the line
/// was increased in length.
/// </summary>
/// <param name="line">The <see cref="TextBoxLine"/> that had text added to it.</param>
internal void NotifyTextAdded(TextBoxLine line)
{
if (_font == null)
{
return;
}
var width = line.GetWidth(_font);
if (width <= _maxLineLength)
{
return;
}
var newLines = StyledText.ToMultiline(line.GetLineTexts, false, _font, _maxLineLength);
if (newLines.Count <= 1)
{
return;
}
// Avoid infinite recursion by not updating if the text didn't change
var first = newLines[0];
if (first.Sum(x => x.Text.Length) == line.LineText.Length &&
StyledText.ToString(first).Equals(line.LineText, StringComparison.Ordinal))
{
return;
}
line.Clear();
line.Append(newLines[0]);
var lineIndex = _lines.IndexOf(line);
if (lineIndex != _lines.Count - 1 && _lines[lineIndex + 1].WasAutoBroken)
{
// We're not at the last line AND the next line was auto-split, so keep inserting at the
// start of the next line in reverse
for (var i = newLines.Count - 1; i > 0; i--)
{
foreach (var j in newLines[i].Reverse <StyledText>())
{
_lines[lineIndex + 1].Insert(j, 0);
}
}
}
else
{
// We're at the last line or the next line was not an auto-split line
for (var i = 1; i < newLines.Count; i++)
{
var newLine = new TextBoxLine(this, true);
newLine.Append(newLines[i]);
_lines.Insert(lineIndex + i, newLine);
}
}
}
/// <summary>
/// A callback for the <see cref="TextBoxLine"/> to notify this <see cref="TextBoxLines"/> that the line
/// was increased in length.
/// </summary>
/// <param name="line">The <see cref="TextBoxLine"/> that had text added to it.</param>
internal void NotifyTextAdded(TextBoxLine line)
{
if (_font == null)
return;
var width = line.GetWidth(_font);
if (width <= _maxLineLength)
return;
var newLines = StyledText.ToMultiline(line.GetLineTexts, false, _font, _maxLineLength);
if (newLines.Count <= 1)
return;
// Avoid infinite recursion by not updating if the text didn't change
var first = newLines[0];
if (first.Sum(x => x.Text.Length) == line.LineText.Length &&
StyledText.ToString(first).Equals(line.LineText, StringComparison.Ordinal))
return;
line.Clear();
line.Append(newLines[0]);
var lineIndex = _lines.IndexOf(line);
if (lineIndex != _lines.Count - 1 && _lines[lineIndex + 1].WasAutoBroken)
{
// We're not at the last line AND the next line was auto-split, so keep inserting at the
// start of the next line in reverse
for (var i = newLines.Count - 1; i > 0; i--)
{
foreach (var j in newLines[i].Reverse<StyledText>())
{
_lines[lineIndex + 1].Insert(j, 0);
}
}
}
else
{
// We're at the last line or the next line was not an auto-split line
for (var i = 1; i < newLines.Count; i++)
{
var newLine = new TextBoxLine(this, true);
newLine.Append(newLines[i]);
_lines.Insert(lineIndex + i, newLine);
}
}
}
/// <summary>
/// Appends the <paramref name="text"/> to the <see cref="TextBox"/> at the end.
/// </summary>
/// <param name="text">The text to append.</param>
public void Append(StyledText text)
{
if (text.Text.Length == 0)
return;
if (!IsMultiLine)
_lines.LastLine.Append(text.ToSingleline());
else
{
var textLines = StyledText.ToMultiline(text);
_lines.LastLine.Append(textLines[0]);
for (var i = 1; i < textLines.Count; i++)
{
var newLine = new TextBoxLine(_lines);
_lines.Insert(_lines.Count, newLine);
newLine.Append(textLines[i]);
}
TruncateIfNeeded();
}
_numCharsToDraw.Invalidate();
_hasTextChanged = true;
}
/// <summary>
/// Splits the text in this <see cref="TextBoxLine"/> at the given character index in the line.
/// </summary>
/// <param name="lineCharacterIndex">The index of the character to split the line at. This character
/// at this index will be the first character on the new line.</param>
/// <param name="currentLine">A <see cref="TextBoxLine"/> representing the remainder of the current
/// line (the one the split initially was made on).</param>
/// <param name="nextLine">A <see cref="TextBoxLine"/> representing the additional line created
/// from the split.</param>
public void SplitAt(int lineCharacterIndex, out TextBoxLine currentLine, out TextBoxLine nextLine)
{
if (lineCharacterIndex == 0)
{
// Split at the start of the line
// First line is empty, second line is the full line
currentLine = new TextBoxLine(TextBoxLines);
nextLine = this;
return;
}
else if (lineCharacterIndex == LineText.Length)
{
// Split at the end of the line
// First line is the full line, second line is empty
currentLine = this;
nextLine = new TextBoxLine(TextBoxLines);
return;
}
else
{
// Split up somewhere in the middle
// Find the StyledText for the character
StyledText text;
int textIndex;
int listIndex;
FindLineCharacter(lineCharacterIndex, out text, out textIndex, out listIndex);
// Split the StyledText
StyledText left;
StyledText right;
text.SplitAt(textIndex, out left, out right);
// The first line will be all the StyledTexts before the one split, plus the left side of the split
// The second line will be the right side of the split, plus all the StyledTexts after the one split
currentLine = new TextBoxLine(TextBoxLines);
for (var i = 0; i < listIndex; i++)
{
currentLine.Append(_texts[i]);
}
currentLine.Append(left);
nextLine = new TextBoxLine(TextBoxLines);
nextLine.Append(right);
for (var i = listIndex + 1; i < _texts.Count; i++)
{
nextLine.Append(_texts[i]);
}
}
}