/*
Copyright (C) 2001 - 2013 Evan Teran
                          evan.teran@gmail.com

Copyright (C) 2006        Michel Marti
                          mma@objectxp.com

Copyright (C) 1996 - 2000 Bernd Johannes Wuebben
                          wuebben@kde.org

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, see <http://www.gnu.org/licenses/>.
*/

#include "kcalc.h"

#include <clocale>

#include <QApplication>
#include <QCursor>
#include <QtGui/qevent.h>
#include <QShortcut>
#include <QStyle>
#include <QMenuBar>

#include <kaboutdata.h>
#include <kacceleratormanager.h>
#include <kaction.h>
#include <kactioncollection.h>
#include <kapplication.h>
#include <kbuttongroup.h>
#include <kcmdlineargs.h>
#include <kcolorbutton.h>
#include <kcolormimedata.h>
#include <kconfig.h>
#include <kconfigdialog.h>
#include <kdialog.h>
#include <kglobal.h>
#include <kglobalsettings.h>
#include <kmenu.h>
#include <knumvalidator.h>
#include <kpushbutton.h>
#include <kstandardaction.h>
#include <kstatusbar.h>
#include <ktoggleaction.h>
#include <ktoolbar.h>
#include <kxmlguifactory.h>

#include "kcalc_bitset.h"
#include "kcalc_const_menu.h"
#include "kcalc_settings.h"
#include "kcalcdisplay.h"
#include "version.h"

namespace {
const char description[] = I18N_NOOP("KDE Calculator");
const char version[]     = KCALCVERSION;
const int maxprecision   = 1000;
}


//------------------------------------------------------------------------------
// Name: KCalculator
// Desc: constructor
//------------------------------------------------------------------------------
KCalculator::KCalculator(QWidget *parent) :
        KXmlGuiWindow(parent),
        shift_mode_(false),
        hyp_mode_(false),
        memory_num_(0.0),
        constants_menu_(0),
        constants_(0),
        core() {

    // central widget to contain all the elements
    QWidget *const central = new QWidget(this);
    central->setLayoutDirection(Qt::LeftToRight);
    setCentralWidget(central);
    KAcceleratorManager::setNoAccel(central);

    // load science constants_ from xml-file
    KCalcConstMenu::init_consts();

    // setup interface (order is critical)
    setupUi(central);
    setupMainActions();
    setupStatusbar();
    createGUI();
    setupKeys();

    toolBar()->hide(); // hide by default

    // create button groups
    base_choose_group_ = new QButtonGroup(this);
    base_choose_group_->setExclusive(true);
    base_choose_group_->addButton(hexRadio, HexMode);
    base_choose_group_->addButton(decRadio, DecMode);
    base_choose_group_->addButton(octRadio, OctMode);
    base_choose_group_->addButton(binRadio, BinMode);
    connect(base_choose_group_, SIGNAL(buttonClicked(int)),
    SLOT(slotBaseSelected(int)));

    angle_choose_group_ =  new QButtonGroup(this);
    angle_choose_group_->setExclusive(true);
    angle_choose_group_->addButton(degRadio, DegMode);
    angle_choose_group_->addButton(radRadio, RadMode);
    angle_choose_group_->addButton(gradRadio, GradMode);
    connect(angle_choose_group_, SIGNAL(buttonClicked(int)),
    SLOT(slotAngleSelected(int)));

    // additional menu setup
    constants_menu_ = createConstantsMenu();
    menuBar()->insertMenu((menuBar()->actions)()[2], constants_menu_);

    // misc setup
    setColors();
    setFonts();

    // Show the result in the app's caption in taskbar (wishlist - bug #52858)
    if (KCalcSettings::captionResult() == true) {
        connect(calc_display, SIGNAL(changedText(QString)), SLOT(setCaption(QString)));
    }

    calc_display->changeSettings();
    setPrecision();

    updateGeometry();

    setFixedSize(minimumSize());

    updateDisplay(UPDATE_FROM_CORE);

    // misc settings
    KCalcSettings::EnumCalculatorMode::type calculatorMode = KCalcSettings::calculatorMode();

    switch (calculatorMode) {
    case KCalcSettings::EnumCalculatorMode::science:
        action_mode_science_->setChecked(true);
        break;
    case KCalcSettings::EnumCalculatorMode::statistics:
        action_mode_statistic_->setChecked(true);
        break;
    case KCalcSettings::EnumCalculatorMode::numeral:
        action_mode_numeral_->setChecked(true);
        break;
    case KCalcSettings::EnumCalculatorMode::simple:
    default:
        action_mode_simple_->setChecked(true);
    }

    setAngle();
    setBase();

    // connections
    connect(KGlobalSettings::self(), SIGNAL(kdisplayPaletteChanged()), SLOT(setColors()));
    connect(KGlobalSettings::self(), SIGNAL(kdisplayFontChanged()), SLOT(setFonts()));

    calc_display->setFocus();
}

//------------------------------------------------------------------------------
// Name: ~KCalculator
// Desc: deconstructor
//------------------------------------------------------------------------------
KCalculator::~KCalculator() {

    KCalcSettings::self()->writeConfig();
}

//------------------------------------------------------------------------------
// Name: setupMainActions
// Desc: connects all of the basic actions
//------------------------------------------------------------------------------
void KCalculator::setupMainActions() {

    // file menu
    KStandardAction::quit(this, SLOT(close()), actionCollection());

    // edit menu
    KStandardAction::undo(calc_display, SLOT(slotHistoryBack()), actionCollection());
    KStandardAction::redo(calc_display, SLOT(slotHistoryForward()), actionCollection());
    KStandardAction::cut(calc_display, SLOT(slotCut()), actionCollection());
    KStandardAction::copy(calc_display, SLOT(slotCopy()), actionCollection());
    KStandardAction::paste(calc_display, SLOT(slotPaste()), actionCollection());

    // mode menu
    QActionGroup *modeGroup = new QActionGroup(this);

    action_mode_simple_ = actionCollection()->add<KToggleAction>(QLatin1String("mode_simple"));
    action_mode_simple_->setActionGroup(modeGroup);
    action_mode_simple_->setText(i18n("Simple Mode"));
    connect(action_mode_simple_, SIGNAL(toggled(bool)), SLOT(slotSetSimpleMode()));

    action_mode_science_ = actionCollection()->add<KToggleAction>(QLatin1String("mode_science"));
    action_mode_science_->setActionGroup(modeGroup);
    action_mode_science_->setText(i18n("Science Mode"));
    connect(action_mode_science_, SIGNAL(toggled(bool)), SLOT(slotSetScienceMode()));

    action_mode_statistic_ = actionCollection()->add<KToggleAction>(QLatin1String("mode_statistics"));
    action_mode_statistic_->setActionGroup(modeGroup);
    action_mode_statistic_->setText(i18n("Statistic Mode"));
    connect(action_mode_statistic_, SIGNAL(toggled(bool)), SLOT(slotSetStatisticMode()));

    action_mode_numeral_ = actionCollection()->add<KToggleAction>(QLatin1String("mode_numeral"));
    action_mode_numeral_->setActionGroup(modeGroup);
    action_mode_numeral_->setText(i18n("Numeral System Mode"));
    connect(action_mode_numeral_, SIGNAL(toggled(bool)), SLOT(slotSetNumeralMode()));

    // settings menu
    action_constants_show_ = actionCollection()->add<KToggleAction>(QLatin1String("show_constants"));
    action_constants_show_->setText(i18n("Constants &Buttons"));
    action_constants_show_->setChecked(true);
    connect(action_constants_show_, SIGNAL(toggled(bool)), SLOT(slotConstantsShow(bool)));

    action_bitset_show_ = actionCollection()->add<KToggleAction>(QLatin1String("show_bitset"));
    action_bitset_show_->setText(i18n("Show B&it Edit"));
    action_bitset_show_->setChecked(true);
    connect(action_bitset_show_, SIGNAL(toggled(bool)), SLOT(slotBitsetshow(bool)));

    KStandardAction::preferences(this, SLOT(showSettings()), actionCollection());
    KStandardAction::keyBindings(guiFactory(), SLOT(configureShortcuts()), actionCollection());
}

//------------------------------------------------------------------------------
// Name: createConstantsMenu
// Desc: creates and returns a pointer to the constant menu
//------------------------------------------------------------------------------
KCalcConstMenu *KCalculator::createConstantsMenu() {

    KCalcConstMenu *const menu = new KCalcConstMenu(i18n("&Constants"), this);
    connect(menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotConstantToDisplay(science_constant)));
    return menu;
}

//------------------------------------------------------------------------------
// Name: setupStatusbar
// Desc: sets up the status bar with default text
//------------------------------------------------------------------------------
void KCalculator::setupStatusbar() {

    // Status bar contents
    statusBar()->insertPermanentFixedItem(QLatin1String(" NORM "), ShiftField);
    statusBar()->setItemAlignment(ShiftField, Qt::AlignCenter);

    statusBar()->insertPermanentFixedItem(QLatin1String(" HEX "), BaseField);
    statusBar()->setItemAlignment(BaseField, Qt::AlignCenter);

    statusBar()->insertPermanentFixedItem(QLatin1String(" DEG "), AngleField);
    statusBar()->setItemAlignment(AngleField, Qt::AlignCenter);

    statusBar()->insertPermanentFixedItem(QLatin1String(" \xa0\xa0 "), MemField);   // nbsp
    statusBar()->setItemAlignment(MemField, Qt::AlignCenter);
}

//------------------------------------------------------------------------------
// Name: setupNumberKeys
// Desc: sets up number keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupNumberKeys() {

    num_button_group_ = new QButtonGroup(this);
    connect(num_button_group_, SIGNAL(buttonClicked(int)), SLOT(slotNumberclicked(int)));

    num_button_group_->addButton(pb0, 0);
    num_button_group_->addButton(pb1, 1);
    num_button_group_->addButton(pb2, 2);
    num_button_group_->addButton(pb3, 3);
    num_button_group_->addButton(pb4, 4);
    num_button_group_->addButton(pb5, 5);
    num_button_group_->addButton(pb6, 6);
    num_button_group_->addButton(pb7, 7);
    num_button_group_->addButton(pb8, 8);
    num_button_group_->addButton(pb9, 9);
    num_button_group_->addButton(pbA, 0xA);
    num_button_group_->addButton(pbB, 0xB);
    num_button_group_->addButton(pbC, 0xC);
    num_button_group_->addButton(pbD, 0xD);
    num_button_group_->addButton(pbE, 0xE);
    num_button_group_->addButton(pbF, 0xF);
    connect(this, SIGNAL(switchShowAccels(bool)), pb0, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb1, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb2, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb3, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb4, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb5, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb6, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb7, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb8, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pb9, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbA, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbB, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbC, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbD, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbE, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbF, SLOT(slotSetAccelDisplayMode(bool)));
}

//------------------------------------------------------------------------------
// Name: setupRightKeypad
// Desc: sets up right keypad keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupRightKeypad() {

    connect(pbShift, SIGNAL(toggled(bool)), SLOT(slotShifttoggled(bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbShift, SLOT(slotSetAccelDisplayMode(bool)));

    pbBackspace->setShortcut(QKeySequence(Qt::Key_Backspace));
    new QShortcut(Qt::Key_PageUp, pbBackspace, SLOT(animateClick()));
    connect(pbBackspace, SIGNAL(clicked()), SLOT(slotBackspaceclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbBackspace, SLOT(slotSetAccelDisplayMode(bool)));

    pbClear->setShortcut(QKeySequence(Qt::Key_Escape));
    new QShortcut(Qt::Key_PageUp, pbClear, SLOT(animateClick()));
    connect(pbClear, SIGNAL(clicked()), SLOT(slotClearclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbClear, SLOT(slotSetAccelDisplayMode(bool)));

    pbAllClear->setShortcut(QKeySequence(Qt::Key_Delete));
    new QShortcut(Qt::Key_PageDown, pbAllClear, SLOT(animateClick()));
    connect(pbAllClear, SIGNAL(clicked()), SLOT(slotAllClearclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbAllClear, SLOT(slotSetAccelDisplayMode(bool)));

    pbParenOpen->setShortcut(QKeySequence(Qt::Key_ParenLeft));
    connect(pbParenOpen, SIGNAL(clicked()), SLOT(slotParenOpenclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbParenOpen, SLOT(slotSetAccelDisplayMode(bool)));

    pbParenClose->setShortcut(QKeySequence(Qt::Key_ParenRight));
    connect(pbParenClose, SIGNAL(clicked()), SLOT(slotParenCloseclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbParenClose, SLOT(slotSetAccelDisplayMode(bool)));

    pbMemRecall->setDisabled(true);   // nothing in memory at start
    connect(pbMemRecall, SIGNAL(clicked()), SLOT(slotMemRecallclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMemRecall, SLOT(slotSetAccelDisplayMode(bool)));

    connect(pbMemClear, SIGNAL(clicked()), SLOT(slotMemClearclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMemClear, SLOT(slotSetAccelDisplayMode(bool)));

    pbMemPlusMinus->addMode(ModeNormal, i18nc("Add display to memory", "M+"), i18n("Add display to memory"));
    pbMemPlusMinus->addMode(ModeShift, i18nc("Subtract from memory", "M\xe2\x88\x92"), i18n("Subtract from memory"));
    connect(pbMemPlusMinus, SIGNAL(clicked()), SLOT(slotMemPlusMinusclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMemPlusMinus, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbMemPlusMinus, SLOT(slotSetMode(ButtonModeFlags,bool)));

    connect(pbMemStore, SIGNAL(clicked()), SLOT(slotMemStoreclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMemStore, SLOT(slotSetAccelDisplayMode(bool)));

    pbPercent->setShortcut(QKeySequence(Qt::Key_Percent));
    connect(pbPercent, SIGNAL(clicked()), SLOT(slotPercentclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbPercent, SLOT(slotSetAccelDisplayMode(bool)));

    pbPlusMinus->setShortcut(QKeySequence(Qt::Key_Backslash));
    connect(pbPlusMinus, SIGNAL(clicked()), SLOT(slotPlusMinusclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbPlusMinus, SLOT(slotSetAccelDisplayMode(bool)));
}

//------------------------------------------------------------------------------
// Name: setupNumericKeypad
// Desc: sets up numeric keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupNumericKeypad() {

    pbCube->addMode(ModeNormal, i18nc("Third power", "x<sup>3</sup>"), i18n("Third power"));
    pbCube->addMode(ModeShift, QLatin1String("<sup>3</sup>&radic;x"), i18n("Cube root"));
    connect(pbCube, SIGNAL(clicked()), SLOT(slotCubeclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbCube, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbCube, SLOT(slotSetMode(ButtonModeFlags,bool)));

    pbDivision->setShortcut(QKeySequence(Qt::Key_Slash));
    new QShortcut(Qt::Key_division, pbDivision, SLOT(animateClick()));
    connect(pbDivision, SIGNAL(clicked()), SLOT(slotDivisionclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbDivision, SLOT(slotSetAccelDisplayMode(bool)));

    pbMultiplication->setShortcut(QKeySequence(Qt::Key_Asterisk));
    new QShortcut(Qt::Key_X, pbMultiplication, SLOT(animateClick()));
    new QShortcut(Qt::Key_multiply, pbMultiplication, SLOT(animateClick()));
    connect(pbMultiplication, SIGNAL(clicked()), SLOT(slotMultiplicationclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMultiplication, SLOT(slotSetAccelDisplayMode(bool)));

    pbMinus->setShortcut(QKeySequence(Qt::Key_Minus));
    connect(pbMinus, SIGNAL(clicked()), SLOT(slotMinusclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMinus, SLOT(slotSetAccelDisplayMode(bool)));

    pbPlus->setShortcut(QKeySequence(Qt::Key_Plus));
    connect(pbPlus, SIGNAL(clicked()), SLOT(slotPlusclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbPlus, SLOT(slotSetAccelDisplayMode(bool)));

    pbPeriod->setText(KGlobal::locale()->decimalSymbol());
    pbPeriod->setShortcut(KGlobal::locale()->decimalSymbol());

    // TODO: is this needed? the above line look slike it should do the right thing?
    /*
    if (KGlobal::locale()->decimalSymbol() == QLatin1String(".")) {
        new QShortcut(Qt::Key_Comma, pbPeriod, SLOT(animateClick()));
    } else if (KGlobal::locale()->decimalSymbol() == QLatin1String(",")) {
        new QShortcut(Qt::Key_Period, pbPeriod, SLOT(animateClick()));
    }
    */

    connect(pbPeriod, SIGNAL(clicked()), SLOT(slotPeriodclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbPeriod, SLOT(slotSetAccelDisplayMode(bool)));

    pbEqual->setShortcut(QKeySequence(Qt::Key_Enter));
    new QShortcut(Qt::Key_Equal, pbEqual, SLOT(animateClick()));
    new QShortcut(Qt::Key_Return, pbEqual, SLOT(animateClick()));
    connect(pbEqual, SIGNAL(clicked()), SLOT(slotEqualclicked()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbEqual, SLOT(slotSetAccelDisplayMode(bool)));
}

//------------------------------------------------------------------------------
// Name: setupLogicKeys
// Desc: sets up logic keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupLogicKeys() {

    logic_buttons_.append(pbAND);
    logic_buttons_.append(pbOR);
    logic_buttons_.append(pbXOR);
    logic_buttons_.append(pbLsh);
    logic_buttons_.append(pbRsh);
    logic_buttons_.append(pbCmp);

    pbAND->setShortcut(QKeySequence(Qt::Key_Ampersand));
    connect(this, SIGNAL(switchShowAccels(bool)), pbAND, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbAND, SIGNAL(clicked()), SLOT(slotANDclicked()));

    pbOR->setShortcut(QKeySequence(Qt::Key_Bar));
    connect(this, SIGNAL(switchShowAccels(bool)), pbOR, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbOR, SIGNAL(clicked()), SLOT(slotORclicked()));

    connect(this, SIGNAL(switchShowAccels(bool)), pbXOR, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbXOR, SIGNAL(clicked()), SLOT(slotXORclicked()));

    pbLsh->setShortcut(QKeySequence(Qt::Key_Less));
    connect(this, SIGNAL(switchShowAccels(bool)), pbLsh, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbLsh, SIGNAL(clicked()), SLOT(slotLeftShiftclicked()));

    pbRsh->setShortcut(QKeySequence(Qt::Key_Greater));
    connect(this, SIGNAL(switchShowAccels(bool)), pbRsh, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbRsh, SIGNAL(clicked()), SLOT(slotRightShiftclicked()));

    pbCmp->setShortcut(QKeySequence(Qt::Key_AsciiTilde));
    connect(this, SIGNAL(switchShowAccels(bool)), pbCmp, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbCmp, SIGNAL(clicked()), SLOT(slotNegateclicked()));
}

//------------------------------------------------------------------------------
// Name: setupLogicKeys
// Desc: sets up scientific keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupScientificKeys() {

    scientific_buttons_.append(pbHyp);
    scientific_buttons_.append(pbSin);
    scientific_buttons_.append(pbCos);
    scientific_buttons_.append(pbTan);
    scientific_buttons_.append(pbLog);
    scientific_buttons_.append(pbLn);

    connect(this, SIGNAL(switchShowAccels(bool)), pbHyp, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbHyp, SIGNAL(toggled(bool)), SLOT(slotHyptoggled(bool)));

    pbSin->addMode(ModeNormal, i18nc("Sine", "Sin"), i18n("Sine"));
    pbSin->addMode(ModeShift, i18nc("Arc sine", "Asin"), i18n("Arc sine"));
    pbSin->addMode(ModeHyperbolic, i18nc("Hyperbolic sine", "Sinh"), i18n("Hyperbolic sine"));
    pbSin->addMode(ButtonModeFlags(ModeShift | ModeHyperbolic), i18nc("Inverse hyperbolic sine", "Asinh"), i18n("Inverse hyperbolic sine"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbSin, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbSin, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbSin, SIGNAL(clicked()), SLOT(slotSinclicked()));

    pbCos->addMode(ModeNormal, i18nc("Cosine", "Cos"), i18n("Cosine"));
    pbCos->addMode(ModeShift, i18nc("Arc cosine", "Acos"), i18n("Arc cosine"));
    pbCos->addMode(ModeHyperbolic, i18nc("Hyperbolic cosine", "Cosh"), i18n("Hyperbolic cosine"));
    pbCos->addMode(ButtonModeFlags(ModeShift | ModeHyperbolic), i18nc("Inverse hyperbolic cosine", "Acosh"), i18n("Inverse hyperbolic cosine"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbCos, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbCos, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbCos, SIGNAL(clicked()), SLOT(slotCosclicked()));

    pbTan->addMode(ModeNormal, i18nc("Tangent", "Tan"), i18n("Tangent"));
    pbTan->addMode(ModeShift, i18nc("Arc tangent", "Atan"), i18n("Arc tangent"));
    pbTan->addMode(ModeHyperbolic, i18nc("Hyperbolic tangent", "Tanh"), i18n("Hyperbolic tangent"));
    pbTan->addMode(ButtonModeFlags(ModeShift | ModeHyperbolic), i18nc("Inverse hyperbolic tangent", "Atanh"), i18n("Inverse hyperbolic tangent"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbTan, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbTan, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbTan, SIGNAL(clicked()), SLOT(slotTanclicked()));

    pbLog->addMode(ModeNormal, i18nc("Logarithm to base 10", "Log"), i18n("Logarithm to base 10"));
    pbLog->addMode(ModeShift, i18nc("10 to the power of x", "10<sup>x</sup>"), i18n("10 to the power of x"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbLog, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbLog, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbLog, SIGNAL(clicked()), SLOT(slotLogclicked()));
    pbLn->addMode(ModeNormal, i18nc("Natural log", "Ln"), i18n("Natural log"));
    pbLn->addMode(ModeShift, i18nc("Exponential function", "e<sup>x</sup>"), i18n("Exponential function"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbLn, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbLn, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbLn, SIGNAL(clicked()), SLOT(slotLnclicked()));
}

//------------------------------------------------------------------------------
// Name: setupStatisticKeys
// Desc: sets up statistical keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupStatisticKeys() {

    stat_buttons_.append(pbNData);
    stat_buttons_.append(pbMean);
    stat_buttons_.append(pbSd);
    stat_buttons_.append(pbMed);
    stat_buttons_.append(pbDat);
    stat_buttons_.append(pbCSt);

    pbNData->addMode(ModeNormal, i18nc("Number of data entered", "N"), i18n("Number of data entered"));
    pbNData->addMode(ModeShift, QString::fromUtf8("\xce\xa3") + QLatin1Char('x'), i18n("Sum of all data items"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbNData, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbNData, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbNData, SIGNAL(clicked()), SLOT(slotStatNumclicked()));

    pbMean->addMode(ModeNormal, i18nc("Mean", "Mea"), i18n("Mean"));
    pbMean->addMode(ModeShift, QString::fromUtf8("\xce\xa3") + QLatin1String("x<sup>2</sup>"), i18n("Sum of all data items squared"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMean, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbMean, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbMean, SIGNAL(clicked()), SLOT(slotStatMeanclicked()));

    pbSd->addMode(ModeNormal, QString::fromUtf8("\xcf\x83") + QLatin1String("<sub>N</sub>"), i18n("Standard deviation"));
    pbSd->addMode(ModeShift, QString::fromUtf8("\xcf\x83") + QLatin1String("<sub>N-1</sub>"), i18n("Sample standard deviation"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbSd, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbSd, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbSd, SIGNAL(clicked()), SLOT(slotStatStdDevclicked()));

    connect(this, SIGNAL(switchShowAccels(bool)), pbMed, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbMed, SIGNAL(clicked()), SLOT(slotStatMedianclicked()));

    pbDat->addMode(ModeNormal, i18nc("Enter data", "Dat"), i18n("Enter data"));
    pbDat->addMode(ModeShift, i18nc("Delete last data item", "CDat"), i18n("Delete last data item"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbDat, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbDat, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbDat, SIGNAL(clicked()), SLOT(slotStatDataInputclicked()));

    connect(this, SIGNAL(switchShowAccels(bool)), pbCSt, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbCSt, SIGNAL(clicked()), SLOT(slotStatClearDataclicked()));
}

//------------------------------------------------------------------------------
// Name: setupConstantsKeys
// Desc: sets up constants keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupConstantsKeys() {

    const_buttons_.append(pbC1);
    const_buttons_.append(pbC2);
    const_buttons_.append(pbC3);
    const_buttons_.append(pbC4);
    const_buttons_.append(pbC5);
    const_buttons_.append(pbC6);

    pbC1->setButtonNumber(0);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC1, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC1, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC1, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    pbC2->setButtonNumber(1);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC2, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC2, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC2, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    pbC3->setButtonNumber(2);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC3, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC3, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC3, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    pbC4->setButtonNumber(3);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC4, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC4, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC4, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    pbC5->setButtonNumber(4);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC5, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC5, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC5, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    pbC6->setButtonNumber(5);
    connect(this, SIGNAL(switchShowAccels(bool)), pbC6, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbC6, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbC6, SIGNAL(clicked(int)), this, SLOT(slotConstclicked(int)));

    changeButtonNames();
}

//------------------------------------------------------------------------------
// Name: setupMiscKeys
// Desc: sets up misc keys and related shortcuts
//------------------------------------------------------------------------------
void KCalculator::setupMiscKeys() {

    pbMod->addMode(ModeNormal, i18nc("Modulo", "Mod"), i18n("Modulo"));
    pbMod->addMode(ModeShift, i18nc("Integer division", "IntDiv"), i18n("Integer division"));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbMod, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbMod, SLOT(slotSetAccelDisplayMode(bool)));
    pbMod->setShortcut(QKeySequence(Qt::Key_Colon));
    connect(pbMod, SIGNAL(clicked()), SLOT(slotModclicked()));

    pbReci->addMode(ModeNormal, i18nc("Reciprocal", "1/x"), i18n("Reciprocal"));
    pbReci->addMode(ModeShift, i18nc("n Choose m", "nCm"), i18n("n Choose m"));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbReci, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(this, SIGNAL(switchShowAccels(bool)), pbReci, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbReci, SIGNAL(clicked()), SLOT(slotReciclicked()));

    pbFactorial->addMode(ModeNormal, i18nc("Factorial", "x!"), i18n("Factorial"));
    pbFactorial->addMode(ModeShift, QLatin1String("&#915;"), i18n("Gamma"));
    pbFactorial->setShortcut(QKeySequence(Qt::Key_Exclam));
    connect(this, SIGNAL(switchShowAccels(bool)), pbFactorial, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbFactorial, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbFactorial, SIGNAL(clicked()), SLOT(slotFactorialclicked()));

    pbSquare->addMode(ModeNormal, i18nc("Square", "x<sup>2</sup>"), i18n("Square"));
    pbSquare->addMode(ModeShift, QLatin1String("&radic;x"), i18n("Square root"));
    pbSquare->setShortcut(QKeySequence(Qt::Key_BracketLeft));
    new QShortcut(Qt::Key_twosuperior, pbSquare, SLOT(animateClick()));
    connect(this, SIGNAL(switchShowAccels(bool)), pbSquare, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbSquare, SLOT(slotSetMode(ButtonModeFlags,bool)));
    connect(pbSquare, SIGNAL(clicked()), SLOT(slotSquareclicked()));

    pbPower->addMode(ModeNormal, i18nc("x to the power of y", "x<sup>y</sup>"), i18n("x to the power of y"));
    pbPower->addMode(ModeShift, i18nc("x to the power of 1/y", "x<sup>1/y</sup>"), i18n("x to the power of 1/y"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbPower, SLOT(slotSetAccelDisplayMode(bool)));
    connect(this, SIGNAL(switchMode(ButtonModeFlags,bool)), pbPower, SLOT(slotSetMode(ButtonModeFlags,bool)));
    pbPower->setShortcut(QKeySequence(Qt::Key_AsciiCircum));
    connect(pbPower, SIGNAL(clicked()), SLOT(slotPowerclicked()));

    pbEE->addMode(ModeNormal, QLatin1String("x<small>" "\xb7" "10</small><sup>y</sup>"), i18n("Exponent"));
    connect(this, SIGNAL(switchShowAccels(bool)), pbEE, SLOT(slotSetAccelDisplayMode(bool)));
    connect(pbEE, SIGNAL(clicked()), SLOT(slotEEclicked()));
}

//------------------------------------------------------------------------------
// Name: createConstantsMenu
// Desc: additional setup for button keys
// NOTE: all alphanumeric shorts set in ui file
//------------------------------------------------------------------------------
void KCalculator::setupKeys() {

    setupNumberKeys();
    setupRightKeypad();
    setupNumericKeypad();
    setupLogicKeys();
    setupScientificKeys();
    setupStatisticKeys();
    setupConstantsKeys();
    setupMiscKeys();

    // other button lists

    function_button_list_.append(pbHyp);
    function_button_list_.append(pbShift);
    function_button_list_.append(pbEE);
    function_button_list_.append(pbSin);
    function_button_list_.append(pbPlusMinus);
    function_button_list_.append(pbCos);
    function_button_list_.append(pbReci);
    function_button_list_.append(pbTan);
    function_button_list_.append(pbFactorial);
    function_button_list_.append(pbLog);
    function_button_list_.append(pbSquare);
    function_button_list_.append(pbLn);
    function_button_list_.append(pbPower);
    function_button_list_.append(pbCube);

    mem_button_list_.append(pbMemRecall);
    mem_button_list_.append(pbMemPlusMinus);
    mem_button_list_.append(pbMemStore);
    mem_button_list_.append(pbMemClear);
    mem_button_list_.append(pbClear);
    mem_button_list_.append(pbAllClear);

    operation_button_list_.append(pbMultiplication);
    operation_button_list_.append(pbParenOpen);
    operation_button_list_.append(pbParenClose);
    operation_button_list_.append(pbAND);
    operation_button_list_.append(pbDivision);
    operation_button_list_.append(pbOR);
    operation_button_list_.append(pbXOR);
    operation_button_list_.append(pbPlus);
    operation_button_list_.append(pbMinus);
    operation_button_list_.append(pbLsh);
    operation_button_list_.append(pbRsh);
    operation_button_list_.append(pbPeriod);
    operation_button_list_.append(pbEqual);
    operation_button_list_.append(pbPercent);
    operation_button_list_.append(pbCmp);
    operation_button_list_.append(pbMod);
}

//------------------------------------------------------------------------------
// Name: updateGeometry
// Desc: makes all the buttons have reasonable sizes
//------------------------------------------------------------------------------
void KCalculator::updateGeometry() {

    const QSize em = pbAND->fontMetrics().size(0, QLatin1String("M"));
    int margin = QApplication::style()->pixelMetric(QStyle::PM_ButtonMargin, 0, 0);
    margin = qMax(qMin(margin / 2, 3), 3);

    // left pad
    foreach(QObject *obj, leftPad->children()) {
        if (KCalcButton *const button = qobject_cast<KCalcButton *>(obj)) {
            button->setFixedWidth(em.width() * 4 + margin * 2);
            button->installEventFilter(this);
        }
    }

    // right pad
    foreach(QObject *obj, rightPad->children()) {
        KCalcButton *const button = qobject_cast<KCalcButton *>(obj);
        // let Shift expand freely
        if (button && button != pbShift) {
            button->setFixedWidth(em.width() * 3 + margin * 2);
            button->installEventFilter(this);
        }
    }

    // numeric pad
    foreach(QObject *obj, numericPad->children()) {
        if (KCalcButton *const button = qobject_cast<KCalcButton *>(obj)) {
            // let pb0 expand freely
            if (button != pb0) {
                button->setFixedWidth(em.width() * 3 + margin * 2);
            }
            button->installEventFilter(this);
        }
    }
}

//------------------------------------------------------------------------------
// Name: slotConstantToDisplay
// Desc: inserts a constant
//------------------------------------------------------------------------------
void KCalculator::slotConstantToDisplay(const science_constant &const_chosen) {

    QString val = const_chosen.value;
    val.replace(QLatin1Char('.'), KNumber::decimalSeparator());
    calc_display->setAmount(KNumber(val));
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: slotBaseSelected
// Desc: changes the selected numeric base
//------------------------------------------------------------------------------
void KCalculator::slotBaseSelected(int base) {

    int current_base;

    // set display & statusbar (if item exist in statusbar)
    switch (base) {
    case BinMode:
        current_base = calc_display->setBase(NumBase(2));
        statusBar()->changeItem(QLatin1String("BIN"), BaseField);
        calc_display->setStatusText(BaseField, QLatin1String("Bin"));
        break;
    case OctMode:
        current_base = calc_display->setBase(NumBase(8));
        statusBar()->changeItem(QLatin1String("OCT"), BaseField);
        calc_display->setStatusText(BaseField, QLatin1String("Oct"));
        break;
    case DecMode:
        current_base = calc_display->setBase(NumBase(10));
        statusBar()->changeItem(QLatin1String("DEC"), BaseField);
        calc_display->setStatusText(BaseField, QLatin1String("Dec"));
        break;
    case HexMode:
        current_base = calc_display->setBase(NumBase(16));
        statusBar()->changeItem(QLatin1String("HEX"), BaseField);
        calc_display->setStatusText(BaseField, QLatin1String("Hex"));
        break;
    default:
        statusBar()->changeItem(QLatin1String("Error"), BaseField);
        calc_display->setStatusText(BaseField, QLatin1String("Error"));
        return;
    }

    // Enable the buttons available in this base
    for (int i = 0; i < current_base; ++i) {
        (num_button_group_->buttons()[i])->setEnabled(true);
    }

    // Disable the buttons not available in this base
    for (int i = current_base; i < 16; ++i) {
        (num_button_group_->buttons()[i])->setEnabled(false);
    }

    // Only enable the decimal point in decimal
    pbPeriod->setEnabled(current_base == NB_DECIMAL);

    // Only enable the x*10^y button in decimal
    pbEE->setEnabled(current_base == NB_DECIMAL);

    // Disable buttons that make only sense with floating point numbers
    if (current_base != NB_DECIMAL)  {
        foreach(QAbstractButton *btn, scientific_buttons_) {
            btn->setEnabled(false);
        }
    } else {
        foreach(QAbstractButton *btn, scientific_buttons_) {
            btn->setEnabled(true);
        }
    }

    KCalcSettings::setBaseMode(base);
}

//------------------------------------------------------------------------------
// Name: keyPressEvent
// Desc: handles keypress events
//------------------------------------------------------------------------------
void KCalculator::keyPressEvent(QKeyEvent *e) {

    // Fix for bug #314586
    // Basically, on some keyboards such as French, even though the decimal separator
    // is "," the numeric keypad has a "." key. So we fake it so people can more seemlessly
    // enter numbers using the keypad
    if(KNumber::decimalSeparator() != ".") {
        if(e->key() == Qt::Key_Period && e->modifiers() & Qt::KeypadModifier) {
            pbPeriod->animateClick();
        }
    }


    if (((e->modifiers() & Qt::NoModifier) == 0) || (e->modifiers() & Qt::ShiftModifier)) {
        switch (e->key()) {
        case Qt::Key_Backspace:
            calc_display->deleteLastDigit();
            break;
        }
    }

    if (e->key() == Qt::Key_Control) {
        emit switchShowAccels(true);
    }
}

//------------------------------------------------------------------------------
// Name: keyReleaseEvent
// Desc: handles keyrelease events
//------------------------------------------------------------------------------
void KCalculator::keyReleaseEvent(QKeyEvent *e) {

    if (e->key() == Qt::Key_Control) {
        emit switchShowAccels(false);
    }
}

//------------------------------------------------------------------------------
// Name: slotAngleSelected
// Desc: changes the selected angle system
//------------------------------------------------------------------------------
void KCalculator::slotAngleSelected(int mode) {

    angle_mode_ = mode;

    switch (mode) {
    case DegMode:
        statusBar()->changeItem(QLatin1String("DEG"), AngleField);
        calc_display->setStatusText(AngleField, QLatin1String("Deg"));
        break;
    case RadMode:
        statusBar()->changeItem(QLatin1String("RAD"), AngleField);
        calc_display->setStatusText(AngleField, QLatin1String("Rad"));
        break;
    case GradMode:
        statusBar()->changeItem(QLatin1String("GRA"), AngleField);
        calc_display->setStatusText(AngleField, QLatin1String("Gra"));
        break;
    default: // we shouldn't ever end up here
        angle_mode_ = RadMode;
    }

    KCalcSettings::setAngleMode(angle_mode_);
}

//------------------------------------------------------------------------------
// Name: slotEEclicked
// Desc: starts the entering of numers using scientific notation
//------------------------------------------------------------------------------
void KCalculator::slotEEclicked() {
    calc_display->newCharacter(QLatin1Char('e'));
}

//------------------------------------------------------------------------------
// Name: slotShifttoggled
// Desc: updates the shift state for alternate button functionality
//------------------------------------------------------------------------------
void KCalculator::slotShifttoggled(bool flag) {

    shift_mode_ = flag;

    emit switchMode(ModeShift, flag);

    if (shift_mode_) {
        statusBar()->changeItem(i18nc("Second button functions are active", "SHIFT"), ShiftField);
        calc_display->setStatusText(ShiftField, i18n("Shift"));
    } else {
        statusBar()->changeItem(i18nc("Normal button functions are active", "NORM"), ShiftField);
        calc_display->setStatusText(ShiftField, QString());
    }
}

//------------------------------------------------------------------------------
// Name: slotHyptoggled
// Desc: updates the Hyp state for alternate trig button functionality
//------------------------------------------------------------------------------
void KCalculator::slotHyptoggled(bool flag) {

    // toggle between hyperbolic and standart trig functions
    hyp_mode_ = flag;

    emit switchMode(ModeHyperbolic, flag);
}

//------------------------------------------------------------------------------
// Name: slotMemRecallclicked
// Desc: recalls a value from memory
//------------------------------------------------------------------------------
void KCalculator::slotMemRecallclicked() {

    // temp. work-around
    calc_display->sendEvent(KCalcDisplay::EventReset);

    calc_display->setAmount(memory_num_);
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: slotMemStoreclicked
// Desc: stores a value into memory
//------------------------------------------------------------------------------
void KCalculator::slotMemStoreclicked() {

    EnterEqual();

    memory_num_ = calc_display->getAmount();
    calc_display->setStatusText(MemField, QLatin1String("M"));
    statusBar()->changeItem(QLatin1String("M"), MemField);
    pbMemRecall->setEnabled(true);
}

//------------------------------------------------------------------------------
// Name: slotNumberclicked
// Desc: user has entered a digit
//------------------------------------------------------------------------------
void KCalculator::slotNumberclicked(int number_clicked) {

    calc_display->enterDigit(number_clicked);
}

//------------------------------------------------------------------------------
// Name: slotSinclicked
// Desc: executes the sine function
//------------------------------------------------------------------------------
void KCalculator::slotSinclicked() {

    if (hyp_mode_) {
        // sinh or arsinh
        if (!shift_mode_) {
            core.SinHyp(calc_display->getAmount());
        } else {
            core.AreaSinHyp(calc_display->getAmount());
        }
    } else {
        // sine or arcsine
        if (!shift_mode_) {
            switch (angle_mode_) {
            case DegMode:
                core.SinDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.SinRad(calc_display->getAmount());
                break;
            case GradMode:
                core.SinGrad(calc_display->getAmount());
                break;
            }
        } else {
            switch (angle_mode_) {
            case DegMode:
                core.ArcSinDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.ArcSinRad(calc_display->getAmount());
                break;
            case GradMode:
                core.ArcSinGrad(calc_display->getAmount());
                break;
            }
        }
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotPlusMinusclicked
// Desc: changes sign of number being displayed
//------------------------------------------------------------------------------
void KCalculator::slotPlusMinusclicked() {

    // display can only change sign, when in input mode, otherwise we
    // need the core to do this.
    if (!calc_display->sendEvent(KCalcDisplay::EventChangeSign)) {
        core.InvertSign(calc_display->getAmount());
        updateDisplay(UPDATE_FROM_CORE);
    }
}

//------------------------------------------------------------------------------
// Name: slotMemPlusMinusclicked
// Desc: handles arithmetic on values stored in memory
//------------------------------------------------------------------------------
void KCalculator::slotMemPlusMinusclicked() {

    bool tmp_shift_mode = shift_mode_; // store this, because next command deletes shift_mode_
    EnterEqual(); // finish calculation so far, to store result into MEM

    if (!tmp_shift_mode) {
        memory_num_ += calc_display->getAmount();
    } else {
        memory_num_ -= calc_display->getAmount();
    }

    pbShift->setChecked(false);
    statusBar()->changeItem(i18n("M"), MemField);
    calc_display->setStatusText(MemField, i18n("M"));
    pbMemRecall->setEnabled(true);
}

//------------------------------------------------------------------------------
// Name: slotSinclicked
// Desc: executes the cosine function
//------------------------------------------------------------------------------
void KCalculator::slotCosclicked() {

    if (hyp_mode_) {
        // cosh or arcosh
        if (!shift_mode_) {
            core.CosHyp(calc_display->getAmount());
        } else {
            core.AreaCosHyp(calc_display->getAmount());
        }
    } else {
        // cosine or arccosine
        if (!shift_mode_) {
            switch (angle_mode_) {
            case DegMode:
                core.CosDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.CosRad(calc_display->getAmount());
                break;
            case GradMode:
                core.CosGrad(calc_display->getAmount());
                break;
            }
        } else {
            switch (angle_mode_) {
            case DegMode:
                core.ArcCosDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.ArcCosRad(calc_display->getAmount());
                break;
            case GradMode:
                core.ArcCosGrad(calc_display->getAmount());
                break;
            }
        }
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotSinclicked
// Desc: executes the recipricol function
//------------------------------------------------------------------------------
void KCalculator::slotReciclicked() {

    if (shift_mode_) {
        core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_BINOM);
    } else {
        core.Reciprocal(calc_display->getAmount());
        updateDisplay(UPDATE_FROM_CORE);
        return;
    }

    // temp. work-around
    KNumber tmp_num = calc_display->getAmount();
    calc_display->sendEvent(KCalcDisplay::EventReset);
    calc_display->setAmount(tmp_num);
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: slotSinclicked
// Desc: executes the tangent function
//------------------------------------------------------------------------------
void KCalculator::slotTanclicked() {

    if (hyp_mode_) {
        // tanh or artanh
        if (!shift_mode_) {
            core.TangensHyp(calc_display->getAmount());
        } else {
            core.AreaTangensHyp(calc_display->getAmount());
        }
    } else {
        // tan or arctan
        if (!shift_mode_) {
            switch (angle_mode_) {
            case DegMode:
                core.TangensDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.TangensRad(calc_display->getAmount());
                break;
            case GradMode:
                core.TangensGrad(calc_display->getAmount());
                break;
            }
        } else {
            switch (angle_mode_) {
            case DegMode:
                core.ArcTangensDeg(calc_display->getAmount());
                break;
            case RadMode:
                core.ArcTangensRad(calc_display->getAmount());
                break;
            case GradMode:
                core.ArcTangensGrad(calc_display->getAmount());
                break;
            }
        }
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotFactorialclicked
// Desc: executes the factorial function
//------------------------------------------------------------------------------
void KCalculator::slotFactorialclicked() {

    // Set WaitCursor, as this operation may take looooong
    // time and UI frezes with large numbers. User needs some
    // visual feedback.
    QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
    if (!shift_mode_) {
        core.Factorial(calc_display->getAmount());
    } else {
        core.Gamma(calc_display->getAmount());
    }
    QApplication::restoreOverrideCursor();
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotLogclicked
// Desc: executes the Log function
//------------------------------------------------------------------------------
void KCalculator::slotLogclicked() {

    if (!shift_mode_) {
        core.Log10(calc_display->getAmount());
    } else {
        core.Exp10(calc_display->getAmount());
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotSquareclicked
// Desc: executes the x^2 function
//------------------------------------------------------------------------------
void KCalculator::slotSquareclicked() {

    if (!shift_mode_) {
        core.Square(calc_display->getAmount());
    } else {
        core.SquareRoot(calc_display->getAmount());
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotCubeclicked
// Desc: executes the x^3 function
//------------------------------------------------------------------------------
void KCalculator::slotCubeclicked() {

    if (!shift_mode_) {
        core.Cube(calc_display->getAmount());
    } else {
        core.CubeRoot(calc_display->getAmount());
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotCubeclicked
// Desc: executes the ln function
//------------------------------------------------------------------------------
void KCalculator::slotLnclicked() {

    if (!shift_mode_) {
        core.Ln(calc_display->getAmount());
    } else {
        core.Exp(calc_display->getAmount());
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotPowerclicked
// Desc: executes the x^y function
//------------------------------------------------------------------------------
void KCalculator::slotPowerclicked() {

    if (shift_mode_) {
        core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_PWR_ROOT);
        pbShift->setChecked(false);
    } else {
        core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_POWER);
    }

    // temp. work-around
    KNumber tmp_num = calc_display->getAmount();
    calc_display->sendEvent(KCalcDisplay::EventReset);
    calc_display->setAmount(tmp_num);
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: slotMemClearclicked
// Desc: executes the MC function
//------------------------------------------------------------------------------
void KCalculator::slotMemClearclicked() {

    memory_num_ = KNumber::Zero;
    statusBar()->changeItem(QLatin1String(" \xa0\xa0 "), MemField); // nbsp
    calc_display->setStatusText(MemField, QString());
    pbMemRecall->setDisabled(true);
}

//------------------------------------------------------------------------------
// Name: slotBackspaceclicked
// Desc: removes the last input digit
//------------------------------------------------------------------------------
void KCalculator::slotBackspaceclicked() {

    calc_display->deleteLastDigit();
}

//------------------------------------------------------------------------------
// Name: slotClearclicked
// Desc: clears the display
//------------------------------------------------------------------------------
void KCalculator::slotClearclicked() {

    calc_display->sendEvent(KCalcDisplay::EventClear);
}

//------------------------------------------------------------------------------
// Name: slotAllClearclicked
// Desc: clears everything
//------------------------------------------------------------------------------
void KCalculator::slotAllClearclicked() {

    core.Reset();
    calc_display->sendEvent(KCalcDisplay::EventReset);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotParenOpenclicked
// Desc: starts a sub-expression
//------------------------------------------------------------------------------
void KCalculator::slotParenOpenclicked() {

    core.ParenOpen(calc_display->getAmount());
}

//------------------------------------------------------------------------------
// Name: slotParenCloseclicked
// Desc: ends a sub-expression
//------------------------------------------------------------------------------
void KCalculator::slotParenCloseclicked() {

    core.ParenClose(calc_display->getAmount());
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotANDclicked
// Desc: executes a bitwise AND
//------------------------------------------------------------------------------
void KCalculator::slotANDclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_AND);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotMultiplicationclicked
// Desc: executes multiplication
//------------------------------------------------------------------------------
void KCalculator::slotMultiplicationclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_MULTIPLY);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotDivisionclicked
// Desc: executes division
//------------------------------------------------------------------------------
void KCalculator::slotDivisionclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_DIVIDE);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotORclicked
// Desc: executes a bitwise OR
//------------------------------------------------------------------------------
void KCalculator::slotORclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_OR);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotXORclicked
// Desc: executes a bitwise XOR
//------------------------------------------------------------------------------
void KCalculator::slotXORclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_XOR);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotPlusclicked
// Desc: executes addition
//------------------------------------------------------------------------------
void KCalculator::slotPlusclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_ADD);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotPlusclicked
// Desc: executes subtraction
//------------------------------------------------------------------------------
void KCalculator::slotMinusclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_SUBTRACT);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotLeftShiftclicked
// Desc: executes a bitwise left shift
//------------------------------------------------------------------------------
void KCalculator::slotLeftShiftclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_LSH);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotLeftShiftclicked
// Desc: executes a bitwise right shift
//------------------------------------------------------------------------------
void KCalculator::slotRightShiftclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_RSH);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotPeriodclicked
// Desc: enters a decimal into the input stream
//------------------------------------------------------------------------------
void KCalculator::slotPeriodclicked() {

    // i know this isn't locale friendly, should be converted to appropriate
    // value at lower levels
    calc_display->newCharacter(KGlobal::locale()->decimalSymbol()[0]);
}

//------------------------------------------------------------------------------
// Name: EnterEqual
// Desc: calculates and displays the result of the pending operations
//------------------------------------------------------------------------------
void KCalculator::EnterEqual() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_EQUAL);
    updateDisplay(UPDATE_FROM_CORE | UPDATE_STORE_RESULT);
}

//------------------------------------------------------------------------------
// Name: slotEqualclicked
// Desc: calculates and displays the result of the pending operations
//------------------------------------------------------------------------------
void KCalculator::slotEqualclicked() {

    EnterEqual();
}

//------------------------------------------------------------------------------
// Name: slotPercentclicked
// Desc: calculates and displays the result of the pending operations as a percent
//------------------------------------------------------------------------------
void KCalculator::slotPercentclicked() {

    core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_PERCENT);
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotNegateclicked
// Desc: executes a bitwise 2's compliment
// NOTE: implicitly converts the value to an unsigned quantity
//------------------------------------------------------------------------------
void KCalculator::slotNegateclicked() {

    core.Complement(calc_display->getAmount());
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotModclicked
// Desc: executes modulous (remainder division)
//------------------------------------------------------------------------------
void KCalculator::slotModclicked(){

    if (shift_mode_) {
        core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_INTDIV);
    } else {
        core.enterOperation(calc_display->getAmount(), CalcEngine::FUNC_MOD);
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatNumclicked
// Desc: executes Sum function
//------------------------------------------------------------------------------
void KCalculator::slotStatNumclicked() {

    if (!shift_mode_) {
        core.StatCount(KNumber::Zero);
    } else {
        pbShift->setChecked(false);
        core.StatSum(KNumber::Zero);
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatMeanclicked
// Desc: executes Mean function
//------------------------------------------------------------------------------
void KCalculator::slotStatMeanclicked() {

    if (!shift_mode_) {
        core.StatMean(KNumber::Zero);
    } else {
        pbShift->setChecked(false);
        core.StatSumSquares(KNumber::Zero);
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatStdDevclicked
// Desc: executes STD function
//------------------------------------------------------------------------------
void KCalculator::slotStatStdDevclicked() {

    if (shift_mode_) {
        // std (n-1)
        core.StatStdDeviation(KNumber::Zero);
        pbShift->setChecked(false);
    } else {
        // std (n)
        core.StatStdSample(KNumber::Zero);
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatMedianclicked
// Desc: executes Median function
//------------------------------------------------------------------------------
void KCalculator::slotStatMedianclicked() {

    if (!shift_mode_) {
        // std (n-1)
        core.StatMedian(KNumber::Zero);
    } else {
        // std (n)
        core.StatMedian(KNumber::Zero);
        pbShift->setChecked(false);
    }

    // TODO: it seems two different modes should be implemented, but...?
    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatDataInputclicked
// Desc: enters a value for statistical functions
//------------------------------------------------------------------------------
void KCalculator::slotStatDataInputclicked() {

    if (!shift_mode_) {
        core.StatDataNew(calc_display->getAmount());
    } else {
        pbShift->setChecked(false);
        core.StatDataDel(KNumber::Zero);
        statusBar()->showMessage(i18n("Last stat item erased"), 3000);
    }

    updateDisplay(UPDATE_FROM_CORE);
}

//------------------------------------------------------------------------------
// Name: slotStatClearDataclicked
// Desc: clears memory for statical functions
//------------------------------------------------------------------------------
void KCalculator::slotStatClearDataclicked() {

    if (!shift_mode_) {
        core.StatClearAll(KNumber::Zero);
        statusBar()->showMessage(i18n("Stat mem cleared"), 3000);
    } else {
        pbShift->setChecked(false);
        updateDisplay(0);
    }
}

//------------------------------------------------------------------------------
// Name: slotConstclicked
// Desc: enters a constant
//------------------------------------------------------------------------------
void KCalculator::slotConstclicked(int button) {

    if(KCalcConstButton *btn = qobject_cast<KCalcConstButton*>(const_buttons_[button])) {
        if (!shift_mode_) {
            // set the display to the configured value of constant button
            // internally, we deal with C locale style numbers, we need to convert
            QString val = btn->constant();
            val.replace(QLatin1Char('.'), KNumber::decimalSeparator());
            calc_display->setAmount(KNumber(val));

        } else {
            pbShift->setChecked(false);
            
            // internally, we deal with C locale style numbers, we need to convert
            QString val = calc_display->text();
            val.replace(KNumber::decimalSeparator(), QLatin1String("."));
            KCalcSettings::setValueConstant(button, val);

            // below set new tooltip
            btn->setLabelAndTooltip();

            // work around: after storing a number, pressing a digit should start
            // a new number
            calc_display->setAmount(calc_display->getAmount());
        }

        updateDisplay(0);
    }
}

//------------------------------------------------------------------------------
// Name: showSettings
// Desc: opens the shows the settings dialog
//------------------------------------------------------------------------------
void KCalculator::showSettings() {

    // Check if there is already a dialog and if so bring
    // it to the foreground.
    if (KConfigDialog::showDialog(QLatin1String("settings"))) {
        return;
    }

    // Create a new dialog with the same name as the above checking code.
    KConfigDialog *const dialog = new KConfigDialog(this, QLatin1String("settings"), KCalcSettings::self());
    dialog->showButtonSeparator(true);

    // general settings
    General *const general = new General(0);
    general->kcfg_Precision->setMaximum(maxprecision);
    dialog->addPage(general, i18n("General"), QLatin1String("accessories-calculator"), i18n("General Settings"));

    // font settings
    Fonts *const fonts = new Fonts(0);
    dialog->addPage(fonts, i18n("Font"), QLatin1String("preferences-desktop-font"), i18n("Select Display Font"));

    // color settings
    Colors *const color = new Colors(0);
    dialog->addPage(color, i18n("Colors"), QLatin1String("format-fill-color"), i18n("Button & Display Colors"));

    // constant settings
    if (!constants_) {
        constants_ = new Constants(0);
    }

    KCalcConstMenu *tmp_menu;
    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst0(science_constant)));
    constants_->pushButton0->setMenu(tmp_menu);

    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst1(science_constant)));
    constants_->pushButton1->setMenu(tmp_menu);

    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst2(science_constant)));
    constants_->pushButton2->setMenu(tmp_menu);

    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst3(science_constant)));
    constants_->pushButton3->setMenu(tmp_menu);

    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst4(science_constant)));
    constants_->pushButton4->setMenu(tmp_menu);

    tmp_menu = new KCalcConstMenu(this);
    connect(tmp_menu, SIGNAL(triggeredConstant(science_constant)), this, SLOT(slotChooseScientificConst5(science_constant)));
    constants_->pushButton5->setMenu(tmp_menu);

    dialog->addPage(constants_, i18n("Constants"), QLatin1String("preferences-kcalc-constants"), i18n("Define Constants"));

    // When the user clicks OK or Apply we want to update our settings.
    connect(dialog, SIGNAL(settingsChanged(QString)), SLOT(updateSettings()));

    // Display the dialog.
    dialog->show();
}


// these 6 slots are just a quick hack, instead of setting the
// TextEdit fields in the configuration dialog, we are setting the
// Settingvalues themselves!!

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst0
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst0(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant0->setText(chosen_const.value);
    constants_->kcfg_nameConstant0->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst1
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst1(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant1->setText(chosen_const.value);
    constants_->kcfg_nameConstant1->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst2
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst2(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant2->setText(chosen_const.value);
    constants_->kcfg_nameConstant2->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst3
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst3(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant3->setText(chosen_const.value);
    constants_->kcfg_nameConstant3->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst4
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst4(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant4->setText(chosen_const.value);
    constants_->kcfg_nameConstant4->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotChooseScientificConst5
// Desc: updates constants value
//------------------------------------------------------------------------------
void KCalculator::slotChooseScientificConst5(const science_constant &chosen_const) {
    constants_->kcfg_valueConstant5->setText(chosen_const.value);
    constants_->kcfg_nameConstant5->setText(chosen_const.label);
}

//------------------------------------------------------------------------------
// Name: slotSetSimpleMode
// Desc: sets the calculator to have a simple layout
//------------------------------------------------------------------------------
void KCalculator::slotSetSimpleMode() {

    action_constants_show_->setChecked(false);
    action_constants_show_->setEnabled(false);
    action_bitset_show_->setChecked(false);
    action_bitset_show_->setEnabled(false);
    showMemButtons(false);
    showScienceButtons(false);
    showStatButtons(false);
    showLogicButtons(false);

    // hide some individual buttons, which are not in one of the above groups
    pbShift->hide();
    pbMod->hide();
    pbReci->hide();
    pbFactorial->hide();
    pbSquare->hide();
    pbPower->hide();
    pbCube->hide();
    pbBackspace->hide();
    pbEE->hide();

    // delete the constant menu since it doesn't fit
    delete constants_menu_;
    constants_menu_ = 0;

    KCalcSettings::setCalculatorMode(KCalcSettings::EnumCalculatorMode::simple);
}

//------------------------------------------------------------------------------
// Name: slotSetScienceMode
// Desc: sets the calculator to science mode
//------------------------------------------------------------------------------
void KCalculator::slotSetScienceMode() {

    action_constants_show_->setEnabled(true);
    action_constants_show_->setChecked(KCalcSettings::showConstants());
    action_bitset_show_->setChecked(false);
    action_bitset_show_->setEnabled(false);

    // show some individual buttons
    pbShift->show();
    pbMod->show();
    pbReci->show();
    pbFactorial->show();
    pbSquare->show();
    pbPower->show();
    pbCube->show();
    pbBackspace->show();
    pbEE->show();

    // show or hide some groups of buttons
    showMemButtons(true);
    showScienceButtons(true);
    showStatButtons(false);
    showLogicButtons(false);

    if(!constants_menu_) {
        constants_menu_ = createConstantsMenu();
        menuBar()->insertMenu((menuBar()->actions)()[2], constants_menu_);
    }

    KCalcSettings::setCalculatorMode(KCalcSettings::EnumCalculatorMode::science);
}

//------------------------------------------------------------------------------
// Name: slotSetStatisticMode
// Desc: sets the calculator to stats mode
//------------------------------------------------------------------------------
void KCalculator::slotSetStatisticMode() {

    action_constants_show_->setEnabled(true);
    action_constants_show_->setChecked(KCalcSettings::showConstants());
    action_bitset_show_->setChecked(false);
    action_bitset_show_->setEnabled(false);

    // show some individual buttons
    pbShift->show();
    pbMod->show();
    pbReci->show();
    pbFactorial->show();
    pbSquare->show();
    pbPower->show();
    pbCube->show();
    pbBackspace->show();
    pbEE->show();

    // show or hide some groups of buttons
    showMemButtons(true);
    showScienceButtons(true);
    showStatButtons(true);
    showLogicButtons(false);

    if(!constants_menu_) {
        constants_menu_ = createConstantsMenu();
        menuBar()->insertMenu((menuBar()->actions)()[2], constants_menu_);
    }

    KCalcSettings::setCalculatorMode(KCalcSettings::EnumCalculatorMode::statistics);
}

//------------------------------------------------------------------------------
// Name: slotSetNumeralMode
// Desc: sets the calculator to numerical ("programmers") mode
//------------------------------------------------------------------------------
void KCalculator::slotSetNumeralMode() {

    action_constants_show_->setChecked(false);
    action_constants_show_->setEnabled(false);
    action_bitset_show_->setEnabled(true);
    action_bitset_show_->setChecked(KCalcSettings::showBitset());

    // show some individual buttons
    pbShift->show();
    pbMod->show();
    pbReci->show();
    pbFactorial->show();
    pbSquare->show();
    pbPower->show();
    pbCube->show();
    pbBackspace->show();
    pbEE->show();

    // show or hide some groups of buttons
    showMemButtons(true);
    showScienceButtons(false);
    showStatButtons(false);
    showLogicButtons(true);

    if(!constants_menu_) {
        constants_menu_ = createConstantsMenu();
        menuBar()->insertMenu((menuBar()->actions)()[2], constants_menu_);
    }

    KCalcSettings::setCalculatorMode(KCalcSettings::EnumCalculatorMode::numeral);
}

//------------------------------------------------------------------------------
// Name: showMemButtons
// Desc: hides or shows the memory buttons
//------------------------------------------------------------------------------
void KCalculator::showMemButtons(bool toggled) {

    if (toggled) {
        foreach(QAbstractButton *btn, mem_button_list_) {
            btn->show();
        }
    } else {
        foreach(QAbstractButton *btn, mem_button_list_) {
            btn->hide();
        }

        // these are in the mem_button_list_ but should not be hidden
        pbClear->show();
        pbAllClear->show();
    }
}

//------------------------------------------------------------------------------
// Name: showStatButtons
// Desc: hides or shows the stat buttons
//------------------------------------------------------------------------------
void KCalculator::showStatButtons(bool toggled) {

    if (toggled) {
        foreach(QAbstractButton *btn, stat_buttons_) {
            btn->show();
        }
    } else {
        foreach(QAbstractButton *btn, stat_buttons_) {
            btn->hide();
        }
    }
}

//------------------------------------------------------------------------------
// Name: showScienceButtons
// Desc: hides or shows the science buttons
//------------------------------------------------------------------------------
void KCalculator::showScienceButtons(bool toggled) {

    if (toggled) {
        foreach(QAbstractButton* btn, scientific_buttons_) {
            btn->show();
        }

        foreach(QAbstractButton* btn, angle_choose_group_->buttons()) {
            btn->show();
        }

        setAngle();
        statusBar()->setItemFixed(AngleField, -1);
    } else {
        foreach(QAbstractButton* btn, scientific_buttons_) {
            btn->hide();
        }

        foreach(QAbstractButton* btn, angle_choose_group_->buttons()) {
            btn->hide();
        }

        statusBar()->changeItem(QString(), AngleField);
        statusBar()->setItemFixed(AngleField, 0);
        calc_display->setStatusText(AngleField, QString());
    }
}

//------------------------------------------------------------------------------
// Name: showLogicButtons
// Desc: hides or shows the logic buttons
//------------------------------------------------------------------------------
void KCalculator::showLogicButtons(bool toggled) {

    if (toggled) {
        mBitset->setEnabled(true);
        connect(mBitset, SIGNAL(valueChanged(quint64)), this, SLOT(slotBitsetChanged(quint64)));
        connect(calc_display, SIGNAL(changedAmount(KNumber)), SLOT(slotUpdateBitset(KNumber)));

        foreach(QAbstractButton* btn, logic_buttons_) {
            btn->show();
        }

        setBase();
        statusBar()->setItemFixed(BaseField, -1);

        foreach(QAbstractButton *btn, base_choose_group_->buttons()) {
            btn->show();
        }

        for (int i = 10; i < 16; ++i) {
            (num_button_group_->button(i))->show();
        }
    } else {
        mBitset->setEnabled(false);
        disconnect(mBitset, SIGNAL(valueChanged(quint64)), this, SLOT(slotBitsetChanged(quint64)));
        disconnect(calc_display, SIGNAL(changedAmount(KNumber)), this, SLOT(slotUpdateBitset(KNumber)));

        foreach(QAbstractButton* btn, logic_buttons_) {
            btn->hide();
        }

        // Hide Hex-Buttons, but first switch back to decimal
        decRadio->animateClick(0);

        foreach(QAbstractButton *btn, base_choose_group_->buttons()) {
            btn->hide();
        }

        statusBar()->changeItem(QString(), BaseField);
        statusBar()->setItemFixed(BaseField, 0);
        calc_display->setStatusText(BaseField, QString());
        for (int i = 10; i < 16; ++i) {
            (num_button_group_->button(i))->hide();
        }
    }
}

//------------------------------------------------------------------------------
// Name: slotConstantsShow
// Desc: hides or shows the constants buttons
//------------------------------------------------------------------------------
void KCalculator::slotConstantsShow(bool toggled) {

    if (toggled) {
        foreach(QAbstractButton *btn, const_buttons_) {
            btn->show();
        }
    } else {
        foreach(QAbstractButton *btn, const_buttons_) {
            btn->hide();
        }
    }

    KCalcSettings::setShowConstants(toggled);
}

//------------------------------------------------------------------------------
// Name: slotBitsetshow
// Desc: hides or shows the bitset buttons
//------------------------------------------------------------------------------
void KCalculator::slotBitsetshow(bool toggled) {

    mBitset->setVisible(toggled);
    KCalcSettings::setShowBitset(toggled);
}

//------------------------------------------------------------------------------
// Name: slotBitsetshow
// Desc: This function is for setting the constant names configured in the
//       kcalc settings menu. If the user doesn't enter a name for the
//       constant C1 to C6 is used.
//------------------------------------------------------------------------------
void KCalculator::changeButtonNames() {

    foreach(QAbstractButton *btn, const_buttons_) {
        if (KCalcConstButton *const constbtn = qobject_cast<KCalcConstButton*>(btn)) {
            constbtn->setLabelAndTooltip();
        }
    }
}

//------------------------------------------------------------------------------
// Name: slotBitsetChanged
// Desc: updates the bitset display
// NOTE: sets display to *unsigned* value
//------------------------------------------------------------------------------
void KCalculator::slotBitsetChanged(quint64 value) {

    calc_display->setAmount(KNumber(value));
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: slotUpdateBitset
// Desc: updates the bitset itself
//------------------------------------------------------------------------------
void KCalculator::slotUpdateBitset(const KNumber &nr) {

    mBitset->setValue(nr.toUint64());
}

//------------------------------------------------------------------------------
// Name: updateSettings
// Desc: updates the persistent settings
//------------------------------------------------------------------------------
void KCalculator::updateSettings() {

    changeButtonNames();
    setColors();
    setFonts();
    setPrecision();

    // Show the result in the app's caption in taskbar (wishlist - bug #52858)
    disconnect(calc_display, SIGNAL(changedText(QString)), this, 0);

    if (KCalcSettings::captionResult()) {
        connect(calc_display, SIGNAL(changedText(QString)), SLOT(setCaption(QString)));
    } else {
        setCaption(QString());
    }

    calc_display->changeSettings();
    updateGeometry();
}

//------------------------------------------------------------------------------
// Name: updateDisplay
// Desc: updates the display
//------------------------------------------------------------------------------
void KCalculator::updateDisplay(UpdateFlags flags) {

    if(flags & UPDATE_FROM_CORE) {
        calc_display->updateFromCore(core, (flags & UPDATE_STORE_RESULT) != 0);
    } else {
        calc_display->update();
    }

    pbShift->setChecked(false);

}

//------------------------------------------------------------------------------
// Name: setColors
// Desc: set the various colours
//------------------------------------------------------------------------------
void KCalculator::setColors() {

    calc_display->changeSettings();

    KColorScheme schemeButtons(QPalette::Active, KColorScheme::Button);
    const QColor defaultColor = schemeButtons.background().color();

    if (KCalcSettings::numberButtonsColor()           == defaultColor
            && KCalcSettings::functionButtonsColor()  == defaultColor
            && KCalcSettings::statButtonsColor()      == defaultColor
            && KCalcSettings::hexButtonsColor()       == defaultColor
            && KCalcSettings::memoryButtonsColor()    == defaultColor
            && KCalcSettings::operationButtonsColor() == defaultColor) {
        return;
    }

    const QString sheet = QLatin1String("KPushButton { background-color: %1 }");

    const QColor numPal(KCalcSettings::numberButtonsColor());
    for (int i = 0; i < 10; ++i) {
        (num_button_group_->button(i))->setStyleSheet(sheet.arg(numPal.name()));
    }

    const QColor funcPal(KCalcSettings::functionButtonsColor());
    foreach(QAbstractButton *btn, function_button_list_) {
        btn->setStyleSheet(sheet.arg(funcPal.name()));
    }

    const QColor statPal(KCalcSettings::statButtonsColor());
    foreach(QAbstractButton *btn, stat_buttons_) {
    btn->setStyleSheet(sheet.arg(statPal.name()));
    }

    const QColor hexPal(KCalcSettings::hexButtonsColor());
    for (int i = 10; i < 16; ++i) {
        (num_button_group_->button(i))->setStyleSheet(sheet.arg(hexPal.name()));
    }

    const QColor memPal(KCalcSettings::memoryButtonsColor());
    foreach(QAbstractButton *btn, mem_button_list_) {
        btn->setStyleSheet(sheet.arg(memPal.name()));
    }

    const QColor opPal(KCalcSettings::operationButtonsColor());
    foreach(QAbstractButton *btn, operation_button_list_) {
        btn->setStyleSheet(sheet.arg(opPal.name()));
    }
}

//------------------------------------------------------------------------------
// Name: setFonts
// Desc: set the various fonts
//------------------------------------------------------------------------------
void KCalculator::setFonts() {

    foreach(QObject *obj, leftPad->children()) {
        if (KCalcButton *const button = qobject_cast<KCalcButton*>(obj)) {
            button->setFont(KCalcSettings::buttonFont());
        }
    }

    foreach(QObject *obj, numericPad->children()) {
        if (KCalcButton *const button = qobject_cast<KCalcButton*>(obj)) {
            button->setFont(KCalcSettings::buttonFont());
        }
    }

    foreach(QObject *obj, rightPad->children()) {
        if (KCalcButton *const button = qobject_cast<KCalcButton*>(obj)) {
            button->setFont(KCalcSettings::buttonFont());
        }
    }

    updateGeometry();
}

//------------------------------------------------------------------------------
// Name: setPrecision
// Desc: set the precision of the display
//------------------------------------------------------------------------------
void KCalculator::setPrecision() {

    KNumber::setDefaultFloatPrecision(KCalcSettings::precision());
    updateDisplay(0);
}

//------------------------------------------------------------------------------
// Name: setAngle
// Desc: sets the angle mode
//------------------------------------------------------------------------------
void KCalculator::setAngle() {

    if (QAbstractButton *const btn = angle_choose_group_->button(KCalcSettings::angleMode())) {
        btn->animateClick(0);
    }
}

//------------------------------------------------------------------------------
// Name: setBase
// Desc: sets the numeric base
//------------------------------------------------------------------------------
void KCalculator::setBase() {
    if (QAbstractButton *const btn = base_choose_group_->button(KCalcSettings::baseMode())) {
        btn->animateClick(0);
    }
}

//------------------------------------------------------------------------------
// Name: eventFilter
// Desc: general event filter used to track events like drag/drop
//------------------------------------------------------------------------------
bool KCalculator::eventFilter(QObject *o, QEvent *e) {

    switch (e->type()) {
    case QEvent::DragEnter: {
        QDragEnterEvent *const ev = reinterpret_cast<QDragEnterEvent *>(e);
        ev->setAccepted(KColorMimeData::canDecode(ev->mimeData()));
        return true;
    }
    case QEvent::DragLeave: {
        return true;
    }
    case QEvent::Drop: {
        KCalcButton *const calcButton = qobject_cast<KCalcButton *>(o);
        if (!calcButton) {
            return false;
        }

        QDropEvent *const ev = reinterpret_cast<QDropEvent *>(e);
        QColor c = KColorMimeData::fromMimeData(ev->mimeData());

        if (c.isValid()) {
            QString cn = c.name();
            QString sheet = QLatin1String("background-color: %1");

            QList<QAbstractButton*> *list;
            const int num_but = num_button_group_->buttons().indexOf(calcButton);
            if (num_but != -1) {
                // Was it hex-button or normal digit??
                if (num_but < 10) {
                    for (int i = 0; i < 10; ++i) {
                        (num_button_group_->buttons()[i])->setStyleSheet(sheet.arg(cn));
                    }
                } else {
                    for (int i = 10; i < 16; ++i) {
                        (num_button_group_->buttons()[i])->setStyleSheet(sheet.arg(cn));
                    }
                }
                return true;
            } else if (function_button_list_.contains(calcButton)) {
                list = &function_button_list_;
            } else if (stat_button_list_.contains(calcButton)) {
                list = &stat_button_list_;
            } else if (mem_button_list_.contains(calcButton)) {
                list = &mem_button_list_;
            } else if (operation_button_list_.contains(calcButton)) {
                list = &operation_button_list_;
            } else {
                return false;
            }

            for (int i = 0; i < list->size(); ++i) {
                list->at(i)->setStyleSheet(sheet.arg(cn));
            }
        }
        return true;
    }
    // FALL THROUGH
    default:
        return KXmlGuiWindow::eventFilter(o, e);
    }
}

////////////////////////////////////////////////////////////////
// Include the meta-object code for classes in this file
//
#include "moc_kcalc.cpp"

//------------------------------------------------------------------------------
// Name: kdemain
// Desc: entry point of the application
//------------------------------------------------------------------------------
int main(int argc, char *argv[]) {

    KAboutData aboutData("kcalc",
        0,
        ki18n("KCalc"),
        version,
        ki18n(description),
        KAboutData::License_GPL,
        ki18n(
            "&copy; 2008-2013, Evan Teran\n"
            "&copy; 2000-2008, The KDE Team\n"
            "&copy; 2003-2005, Klaus Niederkr" "\xc3\xbc" "ger\n"
            "&copy; 1996-2000, Bernd Johannes Wuebben"),
        KLocalizedString(),
        "http://utils.kde.org/projects/kcalc");

    // Klaus Niederkrueger
    aboutData.addAuthor(ki18n("Klaus Niederkr" "\xc3\xbc" "ger"), KLocalizedString(), "kniederk@math.uni-koeln.de");
    aboutData.addAuthor(ki18n("Bernd Johannes Wuebben"), KLocalizedString(), "wuebben@kde.org");
    aboutData.addAuthor(ki18n("Evan Teran"), ki18n("Maintainer"), "eteran@alum.rit.edu");
    aboutData.addAuthor(ki18n("Espen Sand"), KLocalizedString(), "espen@kde.org");
    aboutData.addAuthor(ki18n("Chris Howells"), KLocalizedString(), "howells@kde.org");
    aboutData.addAuthor(ki18n("Aaron J. Seigo"), KLocalizedString(), "aseigo@olympusproject.org");
    aboutData.addAuthor(ki18n("Charles Samuels"), KLocalizedString(), "charles@altair.dhs.org");
    // Rene Merou
    aboutData.addAuthor(ki18n("Ren" "\xc3\xa9" " M" "\xc3\xa9"  "rou"), KLocalizedString(), "ochominutosdearco@yahoo.es");
    aboutData.addAuthor(ki18n("Michel Marti"), KLocalizedString(), "mma@objectxp.com");
    aboutData.addAuthor(ki18n("David Johnson"), KLocalizedString(), "david@usermode.org");

    aboutData.setProgramIconName(QLatin1String("accessories-calculator"));

    KCmdLineArgs::init(argc, argv, &aboutData);

    KApplication app;

    // force system locale to "C" internally [bug 159168]
    setlocale(LC_NUMERIC, "C");

    KNumber::setGroupSeparator(KGlobal::locale()->thousandsSeparator());
    KNumber::setDecimalSeparator(KGlobal::locale()->decimalSymbol());

    KCalculator *calc = new KCalculator(0);
    app.setTopWidget(calc);

    calc->show();
    return app.exec();
}
