1 files changed, 39 insertions, 0 deletions
diff --git a/src-qt5/desktop-utils/lumina-calculator/EqValidator.h b/src-qt5/desktop-utils/lumina-calculator/EqValidator.h
new file mode 100644
index 00000000..8bceb240
--- /dev/null
+++ b/src-qt5/desktop-utils/lumina-calculator/EqValidator.h
@@ -0,0 +1,39 @@
+//===========================================
+//  Lumina Desktop source code
+//  Copyright (c) 2016, Ken Moore
+//  Available under the 3-clause BSD license
+//  See the LICENSE file for full details
+//===========================================
+#ifndef _LUMINA_CALCULATOR_VALIDATOR_H
+#define _LUMINA_CALCULATOR_VALIDATOR_H
+
+#define VALIDCHARS QString("x*+-/^%eE().0123456789#acosinthqrlog\u03C0")
+#define NOSTARTCHARS QString("x*/^%)eE.")
+#define NOENDCHARS QString("x*/^(eE.#")
+#define NOCHANGE QString("().#")
+
+#include <QValidator>
+#include <QString>
+#include <QDebug>
+
+class EqValidator : public QValidator{
+	Q_OBJECT
+public:
+	EqValidator(QObject *parent = 0) : QValidator(parent){}
+	~EqValidator(){}
+
+	virtual void fixup(QString &input) const{
+	  if(input.isEmpty()){ return; }
+	  if( NOSTARTCHARS.contains(input.left(1)) && !NOCHANGE.contains(input.left(1)) ){ input.prepend("1"); }
+	  if( NOENDCHARS.contains(input.right(1)) && !NOCHANGE.contains(input.right(1)) ){ input.append("1"); }
+	}
+
+	virtual QValidator::State validate(QString &input, int&pos) const {
+	  //qDebug() << "Got validate:" << input << pos;
+	  if(pos>0 && !VALIDCHARS.contains(input[pos-1])){ return QValidator::Invalid; }
+	  if(!input.isEmpty() && NOSTARTCHARS.contains(input.left(1))){ return QValidator::Intermediate; }
+	  if(!input.isEmpty() && NOENDCHARS.contains(input.right(1))){ return QValidator::Intermediate; }
+	  return QValidator::Acceptable;
+	}
+};
+#endif