/// <summary>
/// Calculate tab offsets by going up
/// </summary>
private void CalculateTabOffsetUp(ITextSnapshotLine curLine, int colNumber, ColumnSizeInfo colTabOffset)
{
int curLineNumber = curLine.LineNumber - 1;
ITextSnapshot textSnapshot = _textView.TextSnapshot;
ElasticTabstopsLine elasticLine = _elasticTabstopsLinesCache[curLine.LineNumber];
bool isLastColumnInLine = elasticLine.IsLastColumnInLine(colNumber);
while (curLineNumber >= 0)
{
ITextSnapshotLine upLine = textSnapshot.GetLineFromLineNumber(curLineNumber);
ElasticTabstopsLine upElasticLine = GetElasticTabstopsLine(upLine);
if (upElasticLine.IsLastColumnInLine(colNumber) != isLastColumnInLine)
{
break;
}
ElasticTabstopsColumn upColumn = upElasticLine.GetColumnOrDefault(colNumber);
if (upColumn == null)
{
break;
}
upColumn.TabOffset = colTabOffset;
ShrinkTabOffset(upElasticLine, colNumber);
curLineNumber--;
}
}
/// <summary>
/// Calculate tab offsets for line in a given direction
/// </summary>
private void CalculateTabOffsets(ITextSnapshotLine line, CalculateDirection direction, bool forceInvalidate)
{
//Calculates tab offset for a given line for the given direction
ElasticTabstopsLine elasticLine = GetElasticTabstopsLine(line, forceInvalidate);
for (int colNumber = 0; colNumber < elasticLine.ElasticColumns.Length; colNumber++)
{
ElasticTabstopsColumn column = elasticLine.ElasticColumns[colNumber];
//Tab offset is allready calculated during other line calculation
if (!forceInvalidate && column.TabOffset != null)
{
continue;
}
//Assign the same ColumnTabOffset to all columns in the same block
ColumnSizeInfo colTabOffset = new ColumnSizeInfo
{
TabOffset = CalculateInitialTabOffset(elasticLine, colNumber),
ColumnWidth = CalculateInitialWidth(elasticLine, colNumber)
};
column.TabOffset = colTabOffset;
switch (direction)
{
case CalculateDirection.Up:
CalculateTabOffsetUp(line, colNumber, colTabOffset);
break;
case CalculateDirection.Down:
CalculateTabOffsetDown(line, colNumber, colTabOffset);
break;
case CalculateDirection.DownUp:
CalculateTabOffsetDown(line, colNumber, colTabOffset);
CalculateTabOffsetUp(line, colNumber, colTabOffset);
break;
default:
throw new ArgumentException("direction");
}
}
}
/// <summary>
/// Calculate tab offsets by going down
/// </summary>
private void CalculateTabOffsetDown(ITextSnapshotLine curLine, int colNumber, ColumnSizeInfo colTabOffset)
{
int curLineNumber = curLine.LineNumber + 1;
ITextSnapshot textSnapshot = _textView.TextSnapshot;
ElasticTabstopsLine elasticLine = _elasticTabstopsLinesCache[curLine.LineNumber];
bool isLastColumnInLine = elasticLine.IsLastColumnInLine(colNumber);
while (curLineNumber < textSnapshot.LineCount)
{
ITextSnapshotLine downLine = textSnapshot.GetLineFromLineNumber(curLineNumber);
ElasticTabstopsLine downElasticLine = GetElasticTabstopsLine(downLine);
if (downElasticLine.IsLastColumnInLine(colNumber) != isLastColumnInLine)
{
break;
}
ElasticTabstopsColumn downColumn = downElasticLine.GetColumnOrDefault(colNumber);
if (downColumn == null)
{
break;
}
downColumn.TabOffset = colTabOffset;
ShrinkTabOffset(downElasticLine, colNumber);
curLineNumber++;
}
}
/// <summary>
/// returns true if column size contains change, false otherwise
/// </summary>
/// <param name="columnSizeInfo"></param>
/// <returns></returns>
internal bool ChangedRegardingTo(ColumnSizeInfo columnSizeInfo)
{
return(Math.Abs(TabOffset - columnSizeInfo.TabOffset) > 1.0E-10 || Math.Abs(ColumnWidth - columnSizeInfo.ColumnWidth) > 1.0E-10);
}