private void InputTextBox_SelectionChanged(object sender, RoutedEventArgs e)
{
if (!this.IsInitialized)
{
return;
}
var caretIndex = this.InputTextBox.CaretIndex;
var lineIndex = this.InputTextBox.GetLineIndexFromCharacterIndex(caretIndex);
var lines = LineString.Split(this.InputTextBox.Text).ToArray();
// GetLineText and GetCharacterIndexFromLineIndex does not work correctly in full-screen mode.
var currentLine = lines[lineIndex]; //this.InputTextBox.GetLineText(lineIndex);
var selectedText = this.InputTextBox.SelectedText;
if (lineIndex != this.lastCalculatedLineIndex || this.RxSelectionLength.Value != selectedText.Length)
{
// Recalculate current line
this.calculator.Reset();
for (int i = 0; i <= lineIndex; i++)
{
this.calculator.Calculate(lines[i].Text);
}
if (0 < selectedText.Length)
{
this.calculator.Calculate(selectedText);
}
if (this.calculator.Error == null)
{
this.RxResult.Value = this.calculator.Result.ToString();
}
this.RxErrorText.Value = this.calculator.Error;
this.lastCalculatedLineIndex = lineIndex;
}
if (selectedText.Length == 0)
{
int lineStartCharIndex = TextBoxHelper.GetCharacterIndexOfLineStartFromLineIndex(lines, lineIndex);
int charIndexOfLine = caretIndex - lineStartCharIndex;
var offset = (charIndexOfLine < currentLine.Text.Length) ? 0 : -1;
selectedText = CharInfoConvertHelper.GetUnicodeElement(currentLine.Text, charIndexOfLine + offset);
}
this.RxCurrentText.Value = selectedText;
this.RxSelectionLength.Value = this.InputTextBox.SelectionLength;
}
void FunctionItemClicked(TextBox target, string name)
{
var lines = LineString.Split(target.Text).ToArray();
var selectionStart = target.SelectionStart;
var selectionEnd = target.SelectionStart + target.SelectionLength;
TextBoxHelper.GetStartEndLineIndex(lines, selectionStart, selectionEnd,
out var lineIndexStart, out var lineIndexEnd);
if (lineIndexStart < lineIndexEnd)
{
// Multi lines are selected
for (int i = lineIndexStart; i <= lineIndexEnd; i++)
{
lines[i].Text = $"{name}({lines[i].Text})";
}
target.Text = LineString.Join(lines);
target.SelectionStart = TextBoxHelper.GetCharacterIndexOfLineStartFromLineIndex(lines, lineIndexStart);
target.SelectionLength = TextBoxHelper.GetCharacterIndexOfLineEndFromLineIndex(lines, lineIndexEnd) - target.SelectionStart;
}
else
{
var prevSelectedLength = target.SelectedText.Length;
if (0 < name.Length &&
selectionEnd < target.Text.Length &&
target.Text[selectionEnd] == '(')
{
// xxxx(... -> FUNC(...
// ~~~~ |
target.SelectedText = name;
target.SelectionLength = 0;
}
else
{
// xxxx -> xFUNC(xx)x
// ~~ ~~
target.SelectedText = $"{name}({target.SelectedText})";
target.SelectionLength = prevSelectedLength;
}
target.SelectionStart += name.Length + 1;
}
}
public static int GetCharacterIndexOfLineEndFromLineIndex(LineString[] lines, int lineIndex)
{
return(TextBoxHelper.GetCharacterIndexOfLineStartFromLineIndex(lines, lineIndex) + lines.ElementAt(lineIndex).FullLength);
}