public Point GetPointFromPos(int line, int column)
{
int y = (line - this.VScrollPos) * this.lineHeight;
// Because we're not guaranteed to have a monospaced font,
// this gets tricky. We have to measure the substring to
// get the correct X.
DisplayLine displayLine = this.GetDisplayLine(line);
using (Graphics g = Graphics.FromHwnd(this.Handle))
{
int x = this.GetXForColumn(g, displayLine, null, column);
return(new Point(x, y));
}
}
public DiffViewPosition GetPosFromPoint(int x, int y)
{
int line = (y / this.lineHeight) + this.VScrollPos;
// Because we're not guaranteed to have a monospaced font,
// this gets tricky. We have to make an initial guess at
// the column, and then we'll converge to the best one.
DisplayLine displayLine = this.GetDisplayLine(line);
string text = displayLine.GetDisplayText();
// Make a starting guess. Because of tabs and variable width
// fonts, this may be nowhere near the right place...
int column = (int)((x - this.gutterWidth + (this.HScrollPos * this.charWidth)) / this.charWidth);
using (Graphics g = Graphics.FromHwnd(this.Handle))
{
int textLength = text.Length;
int columnGreater = -1;
int columnLess = -1;
int columnX = this.GetXForColumn(g, displayLine, text, column);
if (columnX != x)
{
if (columnX > x)
{
columnGreater = column;
columnLess = 0;
for (column = columnGreater - 1; column >= 0; column--)
{
columnX = this.GetXForColumn(g, displayLine, text, column);
if (columnX > x)
{
columnGreater = column;
}
else
{
columnLess = column;
break;
}
}
}
else
{
// columnX < X
columnLess = column;
columnGreater = textLength;
for (column = columnLess + 1; column <= textLength; column++)
{
columnX = this.GetXForColumn(g, displayLine, text, column);
if (columnX < x)
{
columnLess = column;
}
else
{
columnGreater = column;
break;
}
}
}
columnGreater = EnsureInRange(0, columnGreater, textLength);
columnLess = EnsureInRange(0, columnLess, textLength);
int greaterX = this.GetXForColumn(g, displayLine, text, columnGreater);
int lessX = this.GetXForColumn(g, displayLine, text, columnLess);
if (Math.Abs(greaterX - x) < Math.Abs(lessX - x))
{
column = columnGreater;
}
else
{
column = columnLess;
}
}
}
return(new DiffViewPosition(line, column));
}
public bool FindPrevious(FindData data)
{
bool result = false;
if (string.IsNullOrEmpty(data.Text))
{
data.SearchUp = true;
result = this.Find(data);
}
else
{
int numLines = this.LineCount;
if (numLines > 0)
{
string text = data.Text;
if (!data.MatchCase)
{
text = text.ToUpper();
}
DiffViewPosition startPosition = this.GetFindStartPosition(true);
int lastLineLastColumn = startPosition.Column;
// Use <= so we check the start line again from the end
for (int i = 0; i <= numLines; i++)
{
// Use % so we wrap around at the end.
int lineNumber = (startPosition.Line - i + numLines) % numLines;
// This needs to search the original text.
DisplayLine displayLine = this.GetDisplayLine(lineNumber);
string line = displayLine.OriginalText;
if (!data.MatchCase)
{
line = line.ToUpper();
}
const int StartAtEndColumn = -1;
if (startPosition.Column == StartAtEndColumn)
{
startPosition = new DiffViewPosition(startPosition.Line, Math.Max(0, displayLine.GetDisplayTextLength()));
}
int index;
if (i == numLines)
{
// We're rechecking the start line from the end.
int startIndex = displayLine.GetTextIndexFromDisplayColumn(startPosition.Column);
int lastIndex = displayLine.GetTextIndexFromDisplayColumn(lastLineLastColumn);
index = line.LastIndexOf(text, startIndex, startIndex - lastIndex + 1);
}
else
{
index = line.LastIndexOf(text, displayLine.GetTextIndexFromDisplayColumn(startPosition.Column));
}
if (index >= 0)
{
this.GoToPosition(lineNumber, displayLine.GetDisplayColumnFromTextIndex(index));
this.ExtendSelection(0, text.Length);
result = true;
break;
}
// On all lines but the first, we need to start at the end
startPosition = new DiffViewPosition(startPosition.Line, StartAtEndColumn);
}
}
if (!result)
{
string message = string.Format("'{0}' was not found.", data.Text);
MessageBox.Show(this, message, nameof(this.Find), MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
return(result);
}
