private RectangleF getDocumentArea(Graphics g, RectangleF typingArea, SizeF cellSize)
{
RectangleF unlimitedHeightArea = getUnlimitedHeightArea(typingArea);
RectangleF cursorArea = getCursorCharArea(g, unlimitedHeightArea);
Point cursorColumnRow = getColumnRow(cursorArea.Location, unlimitedHeightArea.Location, cellSize);
oldCursorPositionChangedEventArgs = Util.RaiseIfEventArgsChanged(
OnCursorPositionChanged,
new CursorPositionChangedEventArgs(cursorColumnRow.Y + 1, cursorColumnRow.X + 1),
oldCursorPositionChangedEventArgs);
int currentLineColumns = ImportedText.LineLength(TypedText.Length);
Size documentColumnsRows = new Size(ImportedText.LongestLineLength,
getDocumentRows(g, unlimitedHeightArea, cellSize));
Size visibleColumnsRows = getVisibleColumnsRows(typingArea.Size, cellSize);
float hOffset = cellSize.Width * calcColumnOffset(cursorColumnRow.X, visibleColumnsRows.Width, documentColumnsRows.Width,
currentLineColumns),
vOffset = cellSize.Height * calcRowOffset(cursorColumnRow.Y, visibleColumnsRows.Height, documentColumnsRows.Height);
return(new RectangleF(typingArea.X + hOffset,
typingArea.Y + vOffset,
typingArea.Width,
typingArea.Height - vOffset));
}
private int calcColumnOffset(int cursorColumn, int visibleColumns, int documentColumns, int currentLineColumns)
{
int columnOffset;
if (WordWrap)
{
visibleColumns += 1;
columnOffset = Math.Min(0, visibleColumns - 1 - cursorColumn);
int extraColumns = 0;
if (cursorColumn >= visibleColumns - 1)
{
extraColumns = -columnOffset + Math.Max(0, ImportedText.CountSpaces(TypedText.Length) - 1);
}
documentColumns = visibleColumns + extraColumns;
}
else
{
const int visibleColumnsBeforeJumpBack = 6;
int jumpBackZone = Math.Max(1, visibleColumns - (visibleColumns / 2) + 2 - visibleColumnsBeforeJumpBack);
columnOffset = calculateOffset(cursorColumn, visibleColumns, currentLineColumns, jumpBackZone);
}
var horizontalEventArgs = createVisibleRegionChangedEventArgs(columnOffset, visibleColumns, documentColumns);
oldHorizontalEventArgs = Util.RaiseIfEventArgsChanged(OnHorizontalVisibleRegionChanged,
horizontalEventArgs,
oldHorizontalEventArgs);
return(columnOffset);
}
