qlcdnumber.cpp

奇趣公司比较新的qt/emd版本

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#include "qlcdnumber.h"
#ifndef QT_NO_LCDNUMBER
#include "qbitarray.h"
#include "qpainter.h"
#include "private/qframe_p.h"

class QLCDNumberPrivate : public QFramePrivate
{
    Q_DECLARE_PUBLIC(QLCDNumber)
public:
    void init();
    void internalSetString(const QString& s);
    void drawString(const QString& s, QPainter &, QBitArray * = 0, bool = true);
    //void drawString(const QString &, QPainter &, QBitArray * = 0) const;
    void drawDigit(const QPoint &, QPainter &, int, char, char = ' ');
    void drawSegment(const QPoint &, char, QPainter &, int, bool = false);

    int ndigits;
    double val;
    uint base : 2;
    uint smallPoint : 1;
    uint fill : 1;
    uint shadow : 1;
    QString digitStr;
    QBitArray points;
};

/*!
    \class QLCDNumber

    \brief The QLCDNumber widget displays a number with LCD-like digits.

    \ingroup basicwidgets
    \mainclass

    It can display a number in just about any size. It can display
    decimal, hexadecimal, octal or binary numbers. It is easy to
    connect to data sources using the display() slot, which is
    overloaded to take any of five argument types.

    There are also slots to change the base with setMode() and the
    decimal point with setSmallDecimalPoint().

    QLCDNumber emits the overflow() signal when it is asked to display
    something beyond its range. The range is set by setNumDigits(),
    but setSmallDecimalPoint() also influences it. If the display is
    set to hexadecimal, octal or binary, the integer equivalent of the
    value is displayed.

    These digits and other symbols can be shown: 0/O, 1, 2, 3, 4, 5/S,
    6, 7, 8, 9/g, minus, decimal point, A, B, C, D, E, F, h, H, L, o,
    P, r, u, U, Y, colon, degree sign (which is specified as single
    quote in the string) and space. QLCDNumber substitutes spaces for
    illegal characters.

    It is not possible to retrieve the contents of a QLCDNumber
    object, although you can retrieve the numeric value with value().
    If you really need the text, we recommend that you connect the
    signals that feed the display() slot to another slot as well and
    store the value there.

    Incidentally, QLCDNumber is the very oldest part of Qt, tracing
    its roots back to a BASIC program on the \link
    http://www.nvg.ntnu.no/sinclair/computers/zxspectrum/zxspectrum.htm
    Sinclair Spectrum\endlink.

    \table
    \row \o \inlineimage motif-lcdnumber.png Screenshot of a Motif style LCD number widget
    \inlineimage cde-lcdnumber.png Screenshot of a CDE style LCD number widget
    \inlineimage windows-lcdnumber.png Screenshot of a Windows style LCD number widget
    \inlineimage windowsxp-lcdnumber.png Screenshot of a Windows XP style LCD number widget
    \inlineimage macintosh-lcdnumber.png Screenshot of a Macintosh style LCD number widget
    \inlineimage plastique-lcdnumber.png Screenshot of a Plastique style LCD number widget
    \row \o LCD number widgets shown in various widget styles (from left to right):
    \l{Motif Style Widget Gallery}{Motif}, \l{CDE Style Widget Gallery}{CDE},
    \l{Windows Style Widget Gallery}{Windows}, \l{Windows XP Style Widget Gallery}{Windows XP},
    \l{Macintosh Style Widget Gallery}{Macintosh}, \l{Plastique Style Widget Gallery}{Plastique}.
    \endtable

    \sa QLabel, QFrame, {Digital Clock Example}, {Tetrix Example}
*/

/*!
    \enum QLCDNumber::Mode

    This type determines how numbers are shown.

    \value Hex  Hexadecimal
    \value Dec  Decimal
    \value Oct  Octal
    \value Bin  Binary
    \omitvalue HEX
    \omitvalue DEC
    \omitvalue OCT
    \omitvalue BIN

    If the display is set to hexadecimal, octal or binary, the integer
    equivalent of the value is displayed.
*/

/*!
    \enum QLCDNumber::SegmentStyle

    This type determines the visual appearance of the QLCDNumber
    widget.

    \value Outline gives raised segments filled with the background color.
    \value Filled gives raised segments filled with the windowText color.
    \value Flat gives flat segments filled with the windowText color.
*/



/*!
    \fn void QLCDNumber::overflow()

    This signal is emitted whenever the QLCDNumber is asked to display
    a too-large number or a too-long string.

    It is never emitted by setNumDigits().
*/


static QString int2string(int num, int base, int ndigits, bool *oflow)
{
    QString s;
    bool negative;
    if (num < 0) {
        negative = true;
        num      = -num;
    } else {
        negative = false;
    }
    switch(base) {
        case QLCDNumber::Hex:
            s.sprintf("%*x", ndigits, num);
            break;
        case QLCDNumber::Dec:
            s.sprintf("%*i", ndigits, num);
            break;
        case QLCDNumber::Oct:
            s.sprintf("%*o", ndigits, num);
            break;
        case QLCDNumber::Bin:
            {
                char buf[42];
                char *p = &buf[41];
                uint n = num;
                int len = 0;
                *p = '\0';
                do {
                    *--p = (char)((n&1)+'0');
                    n >>= 1;
                    len++;
                } while (n != 0);
                len = ndigits - len;
                if (len > 0)
                s.fill(QLatin1Char(' '), len);
                s += QString::fromLatin1(p);
            }
            break;
    }
    if (negative) {
        for (int i=0; i<(int)s.length(); i++) {
            if (s[i] != QLatin1Char(' ')) {
                if (i != 0) {
                    s[i-1] = QLatin1Char('-');
                } else {
                    s.insert(0, QLatin1Char('-'));
                }
                break;
            }
        }
    }
    if (oflow)
        *oflow = (int)s.length() > ndigits;
    return s;
}


static QString double2string(double num, int base, int ndigits, bool *oflow)
{
    QString s;
    if (base != QLCDNumber::Dec) {
        bool of = num >= 2147483648.0 || num < -2147483648.0;
        if (of) {                             // oops, integer overflow
            if (oflow)
                *oflow = true;
            return s;
        }
        s = int2string((int)num, base, ndigits, 0);
    } else {                                    // decimal base
        int nd = ndigits;
        do {
            s.sprintf("%*.*g", ndigits, nd, num);
            int i = s.indexOf(QLatin1Char('e'));
            if (i > 0 && s[i+1]==QLatin1Char('+')) {
                s[i] = QLatin1Char(' ');
                s[i+1] = QLatin1Char('e');
            }
        } while (nd-- && (int)s.length() > ndigits);
    }
    if (oflow)
        *oflow = (int)s.length() > ndigits;
    return s;
}


static const char *getSegments(char ch)               // gets list of segments for ch
{
    static const char segments[30][8] =
       { { 0, 1, 2, 4, 5, 6,99, 0},             // 0    0 / O
         { 2, 5,99, 0, 0, 0, 0, 0},             // 1    1
         { 0, 2, 3, 4, 6,99, 0, 0},             // 2    2
         { 0, 2, 3, 5, 6,99, 0, 0},             // 3    3
         { 1, 2, 3, 5,99, 0, 0, 0},             // 4    4
         { 0, 1, 3, 5, 6,99, 0, 0},             // 5    5 / S
         { 0, 1, 3, 4, 5, 6,99, 0},             // 6    6
         { 0, 2, 5,99, 0, 0, 0, 0},             // 7    7
         { 0, 1, 2, 3, 4, 5, 6,99},             // 8    8
         { 0, 1, 2, 3, 5, 6,99, 0},             // 9    9 / g
         { 3,99, 0, 0, 0, 0, 0, 0},             // 10   -
         { 7,99, 0, 0, 0, 0, 0, 0},             // 11   .
         { 0, 1, 2, 3, 4, 5,99, 0},             // 12   A
         { 1, 3, 4, 5, 6,99, 0, 0},             // 13   B
         { 0, 1, 4, 6,99, 0, 0, 0},             // 14   C
         { 2, 3, 4, 5, 6,99, 0, 0},             // 15   D
         { 0, 1, 3, 4, 6,99, 0, 0},             // 16   E
         { 0, 1, 3, 4,99, 0, 0, 0},             // 17   F
         { 1, 3, 4, 5,99, 0, 0, 0},             // 18   h
         { 1, 2, 3, 4, 5,99, 0, 0},             // 19   H
         { 1, 4, 6,99, 0, 0, 0, 0},             // 20   L
         { 3, 4, 5, 6,99, 0, 0, 0},             // 21   o
         { 0, 1, 2, 3, 4,99, 0, 0},             // 22   P
         { 3, 4,99, 0, 0, 0, 0, 0},             // 23   r
         { 4, 5, 6,99, 0, 0, 0, 0},             // 24   u
         { 1, 2, 4, 5, 6,99, 0, 0},             // 25   U
         { 1, 2, 3, 5, 6,99, 0, 0},             // 26   Y
         { 8, 9,99, 0, 0, 0, 0, 0},             // 27   :
         { 0, 1, 2, 3,99, 0, 0, 0},             // 28   '
         {99, 0, 0, 0, 0, 0, 0, 0} };           // 29   empty

    if (ch >= '0' && ch <= '9')
        return segments[ch - '0'];
    if (ch >= 'A' && ch <= 'F')
        return segments[ch - 'A' + 12];
    if (ch >= 'a' && ch <= 'f')
        return segments[ch - 'a' + 12];

    int n;
    switch (ch) {
        case '-':
            n = 10;  break;
        case 'O':
            n = 0;   break;
        case 'g':
            n = 9;   break;
        case '.':
            n = 11;  break;
        case 'h':
            n = 18;  break;
        case 'H':
            n = 19;  break;
        case 'l':
        case 'L':
            n = 20;  break;
        case 'o':
            n = 21;  break;
        case 'p':
        case 'P':
            n = 22;  break;
        case 'r':
        case 'R':
            n = 23;  break;
        case 's':
        case 'S':
            n = 5;   break;
        case 'u':
            n = 24;  break;
        case 'U':
            n = 25;  break;
        case 'y':
        case 'Y':
            n = 26;  break;
        case ':':
            n = 27;  break;
        case '\'':
            n = 28;  break;
        default:
            n = 29;  break;
    }
    return segments[n];
}


#ifdef QT3_SUPPORT
/*! \obsolete
    Constructs an LCD number, sets the number of digits to 5, the base
    to decimal, the decimal point mode to 'small' and the frame style
    to a raised box. The segmentStyle() is set to \c Outline.

    The \a parent and \a name arguments are passed to the QFrame
    constructor.

    \sa setNumDigits(), setSmallDecimalPoint()
*/

QLCDNumber::QLCDNumber(QWidget *parent, const char *name)
        : QFrame(*new QLCDNumberPrivate, parent)
{
    setObjectName(QString::fromAscii(name));
    Q_D(QLCDNumber);
    d->ndigits = 5;
    d->init();
}


/*! \obsolete
    Constructs an LCD number, sets the number of digits to \a
    numDigits, the base to decimal, the decimal point mode to 'small'
    and the frame style to a raised box. The segmentStyle() is set to
    \c Outline.

    The \a parent and \a name arguments are passed to the QFrame
    constructor.

    \sa setNumDigits(), setSmallDecimalPoint()
*/

QLCDNumber::QLCDNumber(uint numDigits, QWidget *parent, const char *name)
        : QFrame(*new QLCDNumberPrivate, parent)
{
    setObjectName(QString::fromAscii(name));
    Q_D(QLCDNumber);
    d->ndigits = numDigits;
    d->init();
}
#endif //QT3_SUPPORT

/*!
    Constructs an LCD number, sets the number of digits to 5, the base
    to decimal, the decimal point mode to 'small' and the frame style
    to a raised box. The segmentStyle() is set to \c Outline.

    The \a parent argument is passed to the QFrame constructor.

    \sa setNumDigits(), setSmallDecimalPoint()
*/

QLCDNumber::QLCDNumber(QWidget *parent)
        : QFrame(*new QLCDNumberPrivate, parent)
{
    Q_D(QLCDNumber);
    d->ndigits = 5;
    d->init();
}


/*!
    Constructs an LCD number, sets the number of digits to \a
    numDigits, the base to decimal, the decimal point mode to 'small'
    and the frame style to a raised box. The segmentStyle() is set to
    \c Outline.

    The \a parent argument is passed to the QFrame constructor.

    \sa setNumDigits(), setSmallDecimalPoint()
*/

QLCDNumber::QLCDNumber(uint numDigits, QWidget *parent)
        : QFrame(*new QLCDNumberPrivate, parent)
{
    Q_D(QLCDNumber);
    d->ndigits = numDigits;
    d->init();
}

void QLCDNumberPrivate::init()
{
    Q_Q(QLCDNumber);

    q->setFrameStyle(QFrame::Box | QFrame::Raised);
    val        = 0;
    base       = QLCDNumber::Dec;
    smallPoint = false;
    q->setNumDigits(ndigits);
    q->setSegmentStyle(QLCDNumber::Outline);