private void UpdateBlocks()
{
if (blocks.Count == 0)
{
return;
}
// While something is visible after last block...
while (!blocks.Last().IsLast&& blocks.Last().Position.Y + blockHeight - VerticalOffset < ActualHeight)
{
int firstLineIndex = blocks.Last().LineEndIndex + 1;
int lastLineIndex = firstLineIndex + maxLineCountInBlock - 1;
lastLineIndex = lastLineIndex <= totalLineCount - 1 ? lastLineIndex : totalLineCount - 1;
int fisrCharIndex = blocks.Last().CharEndIndex + 1;
int lastCharIndex = TextUtilities.GetLastCharIndexFromLineIndex(Text, lastLineIndex); // to be optimized (forward search)
if (lastCharIndex <= fisrCharIndex)
{
blocks.Last().IsLast = true;
return;
}
InnerTextBlock block = new InnerTextBlock(
fisrCharIndex,
lastCharIndex,
blocks.Last().LineEndIndex + 1,
lastLineIndex,
LineHeight);
block.RawText = block.GetSubString(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(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 < Text.Length; i++)
{
if (Text[i] == '\n')
{
localLineCount += 1;
}
if (i == Text.Length - 1)
{
string blockText = Text.Substring(charStart);
InnerTextBlock block = new InnerTextBlock(
charStart,
i, lineStart,
lineStart + TextUtilities.GetLineCount(blockText) - 1,
LineHeight);
block.RawText = block.GetSubString(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)
{
InnerTextBlock block = new InnerTextBlock(
charStart,
i,
lineStart,
lineStart + maxLineCountInBlock - 1,
LineHeight);
block.RawText = block.GetSubString(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;
}
}
}
}