private void updateBlocks()
{
if (_blocks.Count == 0)
{
return;
}
// While something is visible after last block...
while (!_blocks.Last().IsLast&& _blocks.Last().Position.Y + _blockHeight - this.TextBox1.VerticalOffset < ActualHeight)
{
int firstLineIndex = _blocks.Last().LineEndIndex + 1;
int lastLineIndex = firstLineIndex + _maxLineCountInBlock - 1;
lastLineIndex = lastLineIndex <= _totalLineCount - 1 ? lastLineIndex : _totalLineCount - 1;
int charStart = _blocks.Last().CharEndIndex + 1;
int lastCharIndex = TextUtilities.GetLastCharIndexFromLineIndex(this.TextBox1.Text, lastLineIndex); // to be optimized (forward search)
if (lastCharIndex <= charStart)
{
_blocks.Last().IsLast = true;
return;
}
var block = new InnerTextBlock(
charStart,
lastCharIndex,
_blocks.Last().LineEndIndex + 1,
lastLineIndex,
LineHeight);
block.RawText = block.GetSubString(this.TextBox1.Text);
block.LineNumbers = getFormattedLineNumbers(block.LineStartIndex, block.LineEndIndex);
_blocks.Add(block);
formatBlock(block, _blocks.Count > 1 ? _blocks[_blocks.Count - 2] : null);
}
}
private void invalidateBlocks(int changeOffset)
{
InnerTextBlock blockChanged = null;
for (int i = 0; i < _blocks.Count; i++)
{
if (_blocks[i].CharStartIndex <= changeOffset && changeOffset <= _blocks[i].CharEndIndex + 1)
{
blockChanged = _blocks[i];
break;
}
}
if (blockChanged == null && changeOffset > 0)
{
blockChanged = _blocks.Last();
}
int fvline = blockChanged != null ? blockChanged.LineStartIndex : 0;
int lvline = GetIndexOfLastVisibleLine();
int fvchar = blockChanged != null ? blockChanged.CharStartIndex : 0;
int lvchar = TextUtilities.GetLastCharIndexFromLineIndex(this.TextBox1.Text, lvline);
if (blockChanged != null)
{
_blocks.RemoveRange(_blocks.IndexOf(blockChanged), _blocks.Count - _blocks.IndexOf(blockChanged));
}
int localLineCount = 1;
int charStart = fvchar;
int lineStart = fvline;
for (int i = fvchar; i < this.TextBox1.Text.Length; i++)
{
if (this.TextBox1.Text[i] == '\n')
{
localLineCount += 1;
}
if (i == this.TextBox1.Text.Length - 1)
{
string blockText = this.TextBox1.Text.Substring(charStart);
var block = new InnerTextBlock(
charStart,
i, lineStart,
lineStart + TextUtilities.GetLineCount(blockText) - 1,
LineHeight);
block.RawText = block.GetSubString(this.TextBox1.Text);
block.LineNumbers = getFormattedLineNumbers(block.LineStartIndex, block.LineEndIndex);
block.IsLast = true;
foreach (InnerTextBlock b in _blocks)
{
if (b.LineStartIndex == block.LineStartIndex)
{
throw new Exception();
}
}
_blocks.Add(block);
formatBlock(block, _blocks.Count > 1 ? _blocks[_blocks.Count - 2] : null);
break;
}
if (localLineCount > _maxLineCountInBlock)
{
var block = new InnerTextBlock(
charStart,
i,
lineStart,
lineStart + _maxLineCountInBlock - 1,
LineHeight);
block.RawText = block.GetSubString(this.TextBox1.Text);
block.LineNumbers = getFormattedLineNumbers(block.LineStartIndex, block.LineEndIndex);
foreach (InnerTextBlock b in _blocks)
{
if (b.LineStartIndex == block.LineStartIndex)
{
throw new Exception();
}
}
_blocks.Add(block);
formatBlock(block, _blocks.Count > 1 ? _blocks[_blocks.Count - 2] : null);
charStart = i + 1;
lineStart += _maxLineCountInBlock;
localLineCount = 1;
if (i > lvchar)
{
break;
}
}
}
}