/***************************************************************************
 *   Copyright (C) 2008 by Peter Dahlberg   *
 *   pdahlberg@gmail.com   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include "expdoublespinbox.h"
#include <QRegExp>
#include <QLocale>
#include <QRegExpValidator>
#include <QLineEdit>
#include <QtDebug>
#include <cmath>

ExpDoubleSpinBox::ExpDoubleSpinBox()
		: QDoubleSpinBox() {
	setPositiveExp(4);
	setNegativeExp(3);
	setDisplayDecimals(decimals());
}


ExpDoubleSpinBox::~ExpDoubleSpinBox() {
}


double ExpDoubleSpinBox::valueFromText ( const QString& text ) const {
	QString myText(text);
	myText.chop(suffix().size());
	myText.remove(prefix().size());
	return myText.toDouble();
}

QString ExpDoubleSpinBox::textFromValue ( double val ) const {
	//qDebug() << val;
	if((val < pow(10,getPositiveExp()) && val > 1) || (val > -pow(10,getPositiveExp()) && val < -1) || val == 0) { 
		//return QDoubleSpinBox::textFromValue ( val );
		return QString("%L1").arg(val,0,'f',getDisplayDecimals());
	}
	else if ( (val >= pow(10, -getNegativeExp()) && val <= 1 ) || (val <= -pow(10, -getNegativeExp()) && val >= -1 ) ){
		//return QDoubleSpinBox::textFromValue ( val );
		return QString("%L1").arg(val,0,'f',getDisplayDecimals());
	}
	else { 
		return QString("%L1").arg(val,0,'e',getDisplayDecimals());
	}
	//return QDoubleSpinBox::textFromValue ( val );
}

QValidator::State ExpDoubleSpinBox::validate ( QString & input, int & pos ) const {
	QString myInput(input);
	myInput.chop(suffix().size());
	myInput.remove(prefix().size());

	QLocale loc;
	QChar decpoint = loc.decimalPoint(); //Locale abhaengiger dezimaltrenner
	QString regExpString =QString("[\\-,\\+]?\\d*\\%1?\\d+([e,E][\\-,\\+]\\d+)?").arg(decpoint);
	QRegExp regExp(regExpString);
   	QValidator *validator = new QRegExpValidator(regExp, 0);
	//qDebug() << validator->validate(input,pos);
	return validator->validate(myInput,pos);
}

QDoubleSpinBox::StepEnabled ExpDoubleSpinBox::stepEnabled () const {
	QAbstractSpinBox::StepEnabled enabled = QDoubleSpinBox::stepEnabled();

	if(
		(value() > 0 && value() < pow(10, -getNegativeExp())) ||
		(value() < 0 && value() > -pow(10, -getNegativeExp())) 
	) { //kein step bei negativen Zehnerpotenzen
		enabled = QAbstractSpinBox::StepNone;
	}

	return enabled;

}
void ExpDoubleSpinBox::setNegativeExp (int exponent) {
	if (negativeExp != exponent && exponent >= 0) negativeExp = exponent;
}
void ExpDoubleSpinBox::setPositiveExp (int exponent) {
	if (positiveExp != exponent && exponent >= 0) positiveExp = exponent;
}
const int ExpDoubleSpinBox::getNegativeExp () const{
	return negativeExp;
}
const int ExpDoubleSpinBox::getPositiveExp () const{
	return positiveExp;
}

void ExpDoubleSpinBox::stepBy ( int steps ) {
	QDoubleSpinBox::stepBy(steps);	
}




int ExpDoubleSpinBox::getDisplayDecimals() const {
	return displayDecimals;
}


void ExpDoubleSpinBox::setDisplayDecimals ( int theValue ) {
	if (displayDecimals == theValue) return;
	//Nicht mehr anzeigen, als die gneauigkeit zulaesst
	if (theValue > decimals()) theValue = decimals();
	displayDecimals = theValue;
}