kcalc

kcalcdisplay.h

00001 /*
00002 
00003  KCalc 
00004 
00005  Copyright (C) Bernd Johannes Wuebben
00006                wuebben@math.cornell.edu
00007            wuebben@kde.org
00008 
00009  This program is free software; you can redistribute it and/or
00010  modify it under the terms of the GNU General Public License
00011  as published by the Free Software Foundation; either version 2
00012  of the License, or (at your option) any later version.
00013 
00014  This program is distributed in the hope that it will be useful,
00015  but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017  GNU General Public License for more details.
00018 
00019  You should have received a copy of the GNU General Public License
00020  along with this program; if not, write to the Free Software
00021  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00022 
00023  */
00024 
00025 
00026 #ifndef _D_KCALCDISPLAY_H_
00027 #define _D_KCALCDISPLAY_H_
00028 
00029 #include <stdlib.h>
00030 #include <QLabel>
00031 #include <QTimer>
00032 #include "knumber.h"
00033 #include "kcalctype.h"
00034 
00035 #if defined HAVE_LONG_DOUBLE && defined HAVE_L_FUNCS
00036     #define PRINT_FLOAT     "%.*Lf"
00037     #define PRINT_LONG_BIG  "%.*Lg"
00038     #define PRINT_LONG      "%Lg"
00039 #else
00040     #define PRINT_FLOAT     "%.*f"
00041     #define PRINT_LONG_BIG  "%.*g"
00042     #define PRINT_LONG      "%g"
00043 #endif
00044 
00045 #ifdef HAVE_LONG_LONG
00046     #define PRINT_OCTAL  "%llo"
00047     #define PRINT_HEX    "%llX"
00048 #else
00049     #define PRINT_OCTAL  "%lo"
00050     #define PRINT_HEX    "%lX"
00051 #endif
00052 
00053 #define     NUM_STATUS_TEXT 4
00054 
00055 /*
00056   This class provides a pocket calculator display.  The display has
00057   implicitely two major modes: One is for editing and one is purely
00058   for displaying.
00059 
00060   When one uses "setAmount", the given amount is displayed, and the
00061   amount which was possibly typed in before is lost. At the same time
00062   this new value can not be modified.
00063   
00064   On the other hand, "addNewChar" adds a new digit to the amount that
00065   is being typed in. If "setAmount" was used before, the display is
00066   cleared and a new input starts.
00067 
00068   TODO: Check overflows, number of digits and such...
00069 */
00070 
00071 enum NumBase {
00072     NB_BINARY = 2,
00073     NB_OCTAL = 8,
00074     NB_DECIMAL = 10,
00075     NB_HEX = 16
00076 };
00077 
00078 
00079 class KCalcDisplay : public QLabel
00080 {
00081 Q_OBJECT
00082 
00083 public:
00084     KCalcDisplay(QWidget *parent=0);
00085     ~KCalcDisplay();
00086 
00087 protected:
00088     void  mousePressEvent ( QMouseEvent *);
00089     virtual void paintEvent(QPaintEvent *p);
00090 
00091 public:
00092     enum Event {
00093       EventReset, // resets display
00094       EventClear, // if no _error reset display
00095       EventError,
00096       EventChangeSign
00097     };
00098     bool sendEvent(Event const event);
00099     void deleteLastDigit(void);
00100     KNumber const & getAmount(void) const;
00101     void newCharacter(char const new_char);
00102     bool setAmount(KNumber const & new_amount);
00103     int setBase(NumBase new_base);
00104     void setBeep(bool flag);
00105     void setGroupDigits(bool flag);
00106     void setFixedPrecision(int precision);
00107     void setPrecision(int precision);
00108     void setText(QString const &string);
00109     QString text() const;
00110     bool updateDisplay(void);
00111     void setStatusText(int i, const QString& text);
00112     virtual QSize sizeHint() const;
00113 private:
00114     bool _beep;
00115     bool _groupdigits;
00116     int  _button;
00117     bool _lit;
00118     NumBase _num_base;
00119 
00120     int _precision;
00121     int _fixed_precision; // "-1" = no fixed_precision
00122 
00123     KNumber _display_amount;
00124 private:
00125     bool changeSign(void);
00126     void invertColors(void);
00127 
00128     // only used for input of new numbers
00129     bool _eestate;
00130     bool _period;
00131     bool _neg_sign;
00132     QString _str_int;
00133     QString _str_int_exp;
00134     QString _str_status[NUM_STATUS_TEXT];
00135 
00136     QTimer* selection_timer;
00137 
00138 signals:
00139     void clicked(void);
00140     void changedText(QString const &);
00141     void changedAmount(const KNumber &);
00142 
00143 public slots:
00144     void slotCut(void);
00145     void slotCopy(void);
00146     void slotPaste(bool bClipboard=true);
00147 
00148 private slots:
00149     void slotSelectionTimedOut(void);
00150     void slotDisplaySelected(void);
00151 };
00152 
00153 #endif // _KCALCDISPLAY_H_
kcalc

kcalcdisplay.h

kcalc

kdeutils
