QLCDNumber(3qt)

NAME
QLCDNumber - Displays a number with LCD-like digits

#include <qlcdnumber.h>

Inherits QFrame.

  Public Members
QLCDNumber ( QWidget * parent=0, const char * name=0 )
QLCDNumber ( uint numDigits, QWidget * parent=0, const char * name=0 )
~QLCDNumber ()
enum Mode { Hex, HEX=Hex, Dec, DEC=Dec, Oct, OCT=Oct, Bin, BIN=Bin }
enum SegmentStyle { Outline, Filled, Flat }
bool smallDecimalPoint () const
int numDigits () const
virtual void setNumDigits ( int nDigits )
bool checkOverflow ( double num ) const
bool checkOverflow ( int num ) const
Mode mode () const
virtual void setMode ( Mode )
SegmentStyle segmentStyle () const
virtual void setSegmentStyle ( SegmentStyle )
double value () const
int intValue () const

  Public Slots
void display ( int num )
void display ( double num )
void display ( const QString & str )
virtual void setHexMode ()
virtual void setDecMode ()
virtual void setOctMode ()
virtual void setBinMode ()
virtual void setSmallDecimalPoint ( bool )

  Signals
void overflow ()

  Protected Members
virtual void drawContents ( QPainter * )

  Properties
Type | Name | READ | WRITE | Options
bool | smallDecimalPoint | smallDecimalPoint | setSmallDecimalPoint
int | numDigits | numDigits | setNumDigits
Mode | mode | mode | setMode
SegmentStyle | segmentStyle | segmentStyle | setSegmentStyle
double | value | value | display
int | intValue | intValue | display

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

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

There are also slots to change the notation mode and decimal point mode.

QLCDNumber emits the overflow() signal when it is asked to display something beyond its range. The range is set by setNumDigits() (but setSmallDecimalPoint() influences it too).

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. If you need to, we recommend that you connect the signals which feed the display() slot to another slot as well and store the value there.

Incidentally, QLCDNumber is the very oldest part of Qt, tracing back to a BASIC program on the Sinclair Spectrum.

[Image Omitted]

[Image Omitted]

See also QLabel and QFrame.

Examples: xform/xform.cpp

  Member Type Documentation

QLCDNumber::Mode
This type determines how numbers are shown. The possible values are:

Hex - Hexadecimal

Dec - Decimal

Oct - Octal

Bin - Binary

QLCDNumber::SegmentStyle
This type determines the visual appearance of the QLCDNumber widget. The possible values are:

Outline gives raised segments filled with the background brush.

Filled gives raised segments filled with the foreground brush.

Flat gives flat segments filled with the foreground brush.

MEMBER FUNCTION DOCUMENTATION

QLCDNumber::QLCDNumber ( QWidget * parent=0, const char * name=0 )
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 Outline.

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

See also setNumDigits() and setSmallDecimalPoint().

QLCDNumber::QLCDNumber ( uint numDigits, QWidget * parent=0, const char * name=0 )
Constructs an LCD number, sets the number of digits to numDigits, the base to decimal, the decimal point mode to 'small' and the frame style to a raised box. The segmentStyle() is set to Outline.

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

See also setNumDigits() and setSmallDecimalPoint().

QLCDNumber::~QLCDNumber ()
Destructs the LCD number.

bool QLCDNumber::checkOverflow ( double num ) const
Returns TRUE if num is too big to be displayed in its entirety, FALSE otherwise.

See also display(), numDigits() and smallDecimalPoint().

bool QLCDNumber::checkOverflow ( int num ) const
Returns TRUE if num is too big to be displayed in its entirety, FALSE otherwise.

See also display(), numDigits() and smallDecimalPoint().

void QLCDNumber::display ( int num ) [slot]
Sets the contents of the display to num.

See also setMode() and smallDecimalPoint().

Examples: xform/xform.cpp

void QLCDNumber::display ( const QString & s ) [slot]
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

This version of the function disregards mode() and smallDecimalPoint().

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.

void QLCDNumber::display ( double num ) [slot]
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

void QLCDNumber::drawContents ( QPainter * p ) [virtual protected]
Draws the LCD number using painter p. This function is called from QFrame::paintEvent().

Reimplemented from QFrame.

int QLCDNumber::intValue () const
Returns the last value set by one of the display() slots rounded to the nearest integer.

If display(QString ) was the last called, 0 is returned.

See also value() and display().

QLCDNumber::Mode QLCDNumber::mode() const
Returns the current display mode, which is one of BIN, OCT, DEC and HEX.

See also setMode() and smallDecimalPoint().

int QLCDNumber::numDigits () const
Returns the current number of digits. If smallDecimalPoint() is FALSE, the decimal point occupies one digit position.

See also setNumDigits() and smallDecimalPoint().

void QLCDNumber::overflow () [signal]
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().

QLCDNumber::SegmentStyle QLCDNumber::segmentStyle() const
Returns the style of the QLCDNumber.

See also setSegmentStyle().

void QLCDNumber::setBinMode () [virtual slot]
Calls setMode( BIN ). Provided for convenience (e.g. for connecting buttons to this).

See also setMode(), setHexMode(), setDecMode(), setOctMode() and mode().

void QLCDNumber::setDecMode () [virtual slot]
Calls setMode( DEC ). Provided for convenience (e.g. for connecting buttons to this).

See also setMode(), setHexMode(), setOctMode(), setBinMode() and mode().

void QLCDNumber::setHexMode () [virtual slot]
Calls setMode( HEX ). Provided for convenience (e.g. for connecting buttons to this).

See also setMode(), setDecMode(), setOctMode(), setBinMode() and mode().

void QLCDNumber::setMode ( Mode m )
Sets the display mode to m, which must be one of BIN, OCT, DEC and HEX. All four modes can display both integers, floating-point numbers and strings (subject to character set limitations).

Example:

    myLcd.setMode( QLCDNumber::HEX );

See also mode(), setHexMode(), setDecMode(), setOctMode(), setBinMode(), setSmallDecimalPoint() and display().

void QLCDNumber::setNumDigits ( int numDigits ) [virtual]
Sets the number of digits shown to numDigits, which is forced into the [0-99] range.

If smallDecimalPoint() is TRUE, numDigits can be shown. If it is FALSE, only numDigits-1 digits can be shown.

See also numDigits(), setMode(), setSmallDecimalPoint() and overflow().

void QLCDNumber::setOctMode () [virtual slot]
Calls setMode( OCT ). Provided for convenience (e.g. for connecting buttons to this).

See also setMode(), setHexMode(), setDecMode(), setBinMode() and mode().

void QLCDNumber::setSegmentStyle ( SegmentStyle s )
Sets the style of the QLCDNumber to s.

Outline gives raised segments filled with the background color.

Filled gives raised segments filled with the foreground color.

Flat gives flat segments filled with the foreground color.

Outline and Filled will additionally use QColorGroup::light() and QColorGroup::dark() for shadow effects.

See also segmentStyle().

void QLCDNumber::setSmallDecimalPoint ( bool b ) [virtual slot]
If b is TRUE, the decimal point is drawn between two digits. If b is FALSE, the decimal point is drawn in a digit position.

The inter-digit space is made slightly wider when the decimal point is drawn between the digits.

See also smallDecimalPoint() and setMode().

QSize QLCDNumber::sizeHint () const [virtual]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

QSizePolicy QLCDNumber::sizePolicy () const [virtual]
Reimplemented for internal reasons; the API is not affected.

Reimplemented from QWidget.

bool QLCDNumber::smallDecimalPoint () const
Returns TRUE if the decimal point is currently drawn between two digit positions, and FALSE if it is drawn in a digit position.

See also setSmallDecimalPoint() and mode().

double QLCDNumber::value () const
Returns the last value set by one of the display() slots.

If display(QString ) was the last called, 0 is returned.

See also intValue() and display().

SEE ALSO
http://doc.trolltech.com/qlcdnumber.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com. See the license file included in the distribution for a complete license statement.

AUTHOR
Generated automatically from the source code.

BUGS
If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html. Good bug reports make our job much simpler. Thank you.

In case of content or formattting problems with this manual page, please report them to qt-bugs@trolltech.com. Please include the name of the manual page (qlcdnumber.3) and the Qt version (2.3.2).