/*************************************************************************** kmymoneycalculator.h - description ------------------- begin : Sat Oct 19 2002 copyright : (C) 2000-2002 by Michael Edwardes email : mte@users.sourceforge.net Javier Campos Morales Felix Rodriguez John C Thomas Baumgart Kevin Tambascio ***************************************************************************/ /*************************************************************************** * * * 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. * * * ***************************************************************************/ #ifndef KMYMONEYCALCULATOR_H #define KMYMONEYCALCULATOR_H // ---------------------------------------------------------------------------- // QT Includes #include #include #include #include #include #include #include // ---------------------------------------------------------------------------- // KDE Includes #include // ---------------------------------------------------------------------------- // Project Includes /** *@author Thomas Baumgart */ /** * This class implements a simple electronic calculator with the * ability of addition, subtraction, multiplication and division * and percentage calculation. Memory locations are not available. * * The first operand and operation can be loaded from an external * source to switch from an edit-widget to the calculator widget * without having the user to re-type the data. See setInitialValues() * for details. */ class kMyMoneyCalculator : public TQFrame { TQ_OBJECT public: kMyMoneyCalculator(TQWidget* parent = 0, const char *name = 0); ~kMyMoneyCalculator(); /** * This methods is used to extract the result of the last * calculation. The fractional part is separated from the * integral part by the character setup using setComma(). * * @return TQString representing the result of the * last operation */ const TQString result(void) const; /** * This method is used to set the character to be used * as the separator between the integer and fractional part * of an operand. Upon creation of the object, m_comma is * set to the current locale setting of KDE's decimalSymbol. * * @param ch TQChar representing the character to be used */ void setComma(const TQChar ch) { m_comma = ch; }; /** * This method is used to preset the first operand and start * execution of an operation. This method is currently used * by kMyMoneyEdit. If @p ev is 0, then no operation will be * started. * * @param value reference to TQString representing the operands value * @param ev pointer to TQKeyEvent representing the operation's key */ void setInitialValues(const TQString& value, TQKeyEvent* ev); signals: /** * This signal is emitted, when a new result is available */ void signalResultAvailable(); protected: void keyPressEvent(TQKeyEvent* ev); /** * This method is used to transform a double into a TQString * and removing any trailing 0's and decimal seperators * * @param val reference to double value to be converted * @return TQString object containing the converted value */ TQString normalizeString(const double& val); protected slots: /** * This method appends the digit represented by the parameter * to the current operand * * @param button integer value of the digit to be added in the * range [0..9] */ void digitClicked(int button); /** * This methods starts the operation contained in the parameter * * @param button The TQt::Keycode for the button pressed or clicked */ void calculationClicked(int button); /** * This method appends a period (comma) to initialize the fractional * part of an operand. The period is only appended once. */ void commaClicked(void); /** * This method reverses the sign of the current operand */ void plusminusClicked(void); /** * This method clears the current operand */ void clearClicked(void); /** * This method clears all registers */ void clearAllClicked(void); /** * This method executes the percent operation */ void percentClicked(void); /** * This method updates the display of the calculator with * the text passed as argument * * @param str reference to TQString containing the new display contents */ void changeDisplay(const TQString& str); private: /** * This member variable stores the current (second) operand */ TQString operand; /** * This member variable stores the last result */ TQString m_result; /** * This member variable stores the representation of the * character to be used to separate the integer and fractional * part of numbers. The internal representation is always a period. */ TQChar m_comma; /** * The numeric representation of a stacked first operand */ double op0; /** * The numeric representation of the first operand */ double op1; /** * This member stores the operation to be performed between * the first and the second operand. */ int op; /** * This member stores a pending addition operation */ int stackedOp; /** * This member stores a pointer to the display area */ TQLabel *display; /** * This member array stores the pointers to the various * buttons of the calculator. It is setup during the * constructor of this object */ KPushButton *buttons[20]; /** * This enumeration type stores the values used for the * various keys internally */ enum { /* 0-9 are used by digits */ COMMA = 10, /* * make sure, that PLUS through EQUAL remain in * the order they are. Otherwise, check the calculation * signal mapper */ PLUS, MINUS, SLASH, STAR, EQUAL, PLUSMINUS, PERCENT, CLEAR, CLEARALL, /* insert new buttons before this line */ MAX_BUTTONS }; /** * This flag signals, if the operand should be replaced upon * a digit key pressure. Defaults to false and will be set, if * setInitialValues() is called without an operation. */ bool m_clearOperandOnDigit; }; #endif