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251 lines
7.1 KiB
251 lines
7.1 KiB
/***************************************************************************
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kmymoneycalculator.h - description
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-------------------
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begin : Sat Oct 19 2002
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copyright : (C) 2000-2002 by Michael Edwardes
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email : mte@users.sourceforge.net
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Javier Campos Morales <javi_c@users.sourceforge.net>
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Felix Rodriguez <frodriguez@users.sourceforge.net>
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John C <thetacoturtle@users.sourceforge.net>
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Thomas Baumgart <ipwizard@users.sourceforge.net>
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Kevin Tambascio <ktambascio@users.sourceforge.net>
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef KMYMONEYCALCULATOR_H
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#define KMYMONEYCALCULATOR_H
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// ----------------------------------------------------------------------------
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// TQt Includes
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#include <tqwidget.h>
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#include <tqframe.h>
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#include <tqlayout.h>
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#include <tqgrid.h>
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#include <tqlcdnumber.h>
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#include <tqlineedit.h>
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#include <tqlabel.h>
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// ----------------------------------------------------------------------------
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// TDE Includes
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#include <kpushbutton.h>
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// ----------------------------------------------------------------------------
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// Project Includes
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/**
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*@author Thomas Baumgart
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*/
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/**
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* This class implements a simple electronic calculator with the
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* ability of addition, subtraction, multiplication and division
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* and percentage calculation. Memory locations are not available.
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*
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* The first operand and operation can be loaded from an external
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* source to switch from an edit-widget to the calculator widget
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* without having the user to re-type the data. See setInitialValues()
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* for details.
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*/
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class kMyMoneyCalculator : public TQFrame {
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TQ_OBJECT
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public:
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kMyMoneyCalculator(TQWidget* parent = 0, const char *name = 0);
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~kMyMoneyCalculator();
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/**
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* This methods is used to extract the result of the last
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* calculation. The fractional part is separated from the
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* integral part by the character setup using setComma().
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*
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* @return TQString representing the result of the
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* last operation
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*/
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const TQString result(void) const;
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/**
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* This method is used to set the character to be used
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* as the separator between the integer and fractional part
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* of an operand. Upon creation of the object, m_comma is
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* set to the current locale setting of KDE's decimalSymbol.
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*
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* @param ch TQChar representing the character to be used
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*/
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void setComma(const TQChar ch) { m_comma = ch; };
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/**
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* This method is used to preset the first operand and start
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* execution of an operation. This method is currently used
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* by kMyMoneyEdit. If @p ev is 0, then no operation will be
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* started.
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*
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* @param value reference to TQString representing the operands value
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* @param ev pointer to TQKeyEvent representing the operation's key
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*/
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void setInitialValues(const TQString& value, TQKeyEvent* ev);
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signals:
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/**
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* This signal is emitted, when a new result is available
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*/
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void signalResultAvailable();
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protected:
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void keyPressEvent(TQKeyEvent* ev);
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/**
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* This method is used to transform a double into a TQString
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* and removing any trailing 0's and decimal seperators
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*
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* @param val reference to double value to be converted
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* @return TQString object containing the converted value
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*/
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TQString normalizeString(const double& val);
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protected slots:
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/**
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* This method appends the digit represented by the parameter
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* to the current operand
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*
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* @param button integer value of the digit to be added in the
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* range [0..9]
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*/
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void digitClicked(int button);
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/**
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* This methods starts the operation contained in the parameter
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*
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* @param button The TQt::Keycode for the button pressed or clicked
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*/
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void calculationClicked(int button);
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/**
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* This method appends a period (comma) to initialize the fractional
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* part of an operand. The period is only appended once.
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*/
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void commaClicked(void);
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/**
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* This method reverses the sign of the current operand
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*/
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void plusminusClicked(void);
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/**
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* This method clears the current operand
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*/
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void clearClicked(void);
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/**
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* This method clears all registers
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*/
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void clearAllClicked(void);
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/**
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* This method executes the percent operation
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*/
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void percentClicked(void);
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/**
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* This method updates the display of the calculator with
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* the text passed as argument
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*
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* @param str reference to TQString containing the new display contents
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*/
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void changeDisplay(const TQString& str);
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private:
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/**
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* This member variable stores the current (second) operand
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*/
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TQString operand;
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/**
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* This member variable stores the last result
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*/
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TQString m_result;
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/**
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* This member variable stores the representation of the
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* character to be used to separate the integer and fractional
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* part of numbers. The internal representation is always a period.
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*/
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TQChar m_comma;
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/**
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* The numeric representation of a stacked first operand
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*/
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double op0;
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/**
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* The numeric representation of the first operand
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*/
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double op1;
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/**
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* This member stores the operation to be performed between
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* the first and the second operand.
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*/
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int op;
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/**
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* This member stores a pending addition operation
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*/
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int stackedOp;
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/**
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* This member stores a pointer to the display area
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*/
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TQLabel *display;
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/**
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* This member array stores the pointers to the various
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* buttons of the calculator. It is setup during the
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* constructor of this object
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*/
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KPushButton *buttons[20];
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/**
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* This enumeration type stores the values used for the
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* various keys internally
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*/
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enum {
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/* 0-9 are used by digits */
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COMMA = 10,
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/*
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* make sure, that PLUS through EQUAL remain in
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* the order they are. Otherwise, check the calculation
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* signal mapper
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*/
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PLUS,
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MINUS,
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SLASH,
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STAR,
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EQUAL,
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PLUSMINUS,
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PERCENT,
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CLEAR,
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CLEARALL,
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/* insert new buttons before this line */
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MAX_BUTTONS
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};
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/**
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* This flag signals, if the operand should be replaced upon
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* a digit key pressure. Defaults to false and will be set, if
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* setInitialValues() is called without an operation.
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*/
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bool m_clearOperandOnDigit;
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};
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#endif
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