public static void MergeLines(this ITextAreaDataSource src, int lineNo)
{
lock (src.LockObject)
{
var line1 = src.GetLine(lineNo - 1) ?? string.Empty;
var line2 = src.GetLine(lineNo) ?? string.Empty;
if (!string.IsNullOrEmpty(line1))
{
line1 += " ";
}
src.Update(lineNo - 1, line1 + line2);
src.DeleteLine(lineNo);
}
}
private void HandleLineInsert(ITextAreaDataSource textAreaDataSource)
{
var lineNo = GetTextLineByScreenLine(CursorY);
var positionNo = GetTextPositionByScreenLine(CursorX);
var line = textAreaDataSource.GetLine(lineNo) ?? string.Empty;
var positionOffset = line.GetPositionOffset();
textAreaDataSource.InsertLine(positionNo, lineNo, positionOffset);
CursorX = positionOffset;
HandleDownArrow();
}
private void HandleBackspace(ITextAreaDataSource textAreaDataSource)
{
var cursorPosition = GetTextPositionByScreenLine(CursorX);
if (cursorPosition <= 0)
{
HandleLinesMerge(textAreaDataSource);
return;
}
var textLineNo = GetTextLineByScreenLine(CursorY);
var str = textAreaDataSource.GetLine(textLineNo);
str = str.BackspaceTextArea(cursorPosition);
CursorX--;
textAreaDataSource.Update(textLineNo, str);
}
private void HandleLinesMerge(ITextAreaDataSource textAreaDataSource)
{
var linePos = GetTextLineByScreenLine(CursorY);
if (linePos == 0)
{
return;
}
var line = textAreaDataSource.GetLine(linePos - 1) ?? string.Empty;
textAreaDataSource.MergeLines(linePos);
HandleUpArrow();
CursorX = line.Length;
if (line.Length > 0)
{
CursorX++;
}
}
private void GetPreviousLinePosition(ITextAreaDataSource textAreaDataSource)
{
var lineNo = GetTextLineByScreenLine(CursorY);
if (lineNo == 0)
{
return;
}
var line = textAreaDataSource.GetLine(lineNo - 1) ?? string.Empty;
HandleUpArrow();
CursorX = line.Length;
if (CursorX > Width)
{
XOffset = CursorX - Width;
CursorX = Width;
}
}
public void KeyPressed(ConsoleKeyInfo key)
{
var textDataSource = _textAreaDataSource;
if (textDataSource == null)
{
return;
}
switch (key.Key)
{
case ConsoleKey.RightArrow:
if ((key.Modifiers & ConsoleModifiers.Shift) != 0)
{
FindNextWord();
}
else
{
HandleRightArrow();
}
return;
case ConsoleKey.LeftArrow:
if ((key.Modifiers & ConsoleModifiers.Shift) != 0)
{
FindPreviousWord(textDataSource);
}
else
{
HandleLeftArrow(textDataSource);
}
return;
case ConsoleKey.DownArrow:
HandleDownArrow();
return;
case ConsoleKey.UpArrow:
HandleUpArrow();
return;
case ConsoleKey.Backspace:
HandleBackspace(textDataSource);
return;
case ConsoleKey.Enter:
HandleLineInsert(textDataSource);
return;
}
if (key.IsKeyWithTextChar())
{
var textLineNo = GetTextYPosition();
var str = _textAreaDataSource.GetLine(textLineNo);
str = str.InsertTextAreaSymbol(GetTextPositionByScreenLine(CursorX), key.KeyChar);
CursorX++;
_textAreaDataSource.Update(textLineNo, str);
}
}
private string GetCurrentLine()
{
return(_textAreaDataSource?.GetLine(GetTextYPosition()));
}