Add option to truncate or pad variable value

lib/utils/single-char-selection.cpp

@@ -0,0 +1,22 @@
+#include "single-char-selection.hpp"
+
+namespace advss {
+
+SingleCharSelection::SingleCharSelection(QWidget *parent) : QLineEdit(parent)
+{
+	setMaxLength(1);
+	setMaximumWidth(50);
+	connect(this, &QLineEdit::textChanged, this,
+		&SingleCharSelection::CharChanged);
+}
+
+void SingleCharSelection::HandleTextChanged(const QString &text)
+{
+	if (text.length() == 1) {
+		emit CharChanged(text);
+	} else if (text.length() > 1) {
+		setText(text.left(1));
+	}
+}
+
+} // namespace advss