TQLCDNumber Class Reference

The TQLCDNumber widget displays a number with LCD-like digits. More...

#include <ntqlcdnumber.h>

Inherits TQFrame.

List of all member functions.

Public Members

TQLCDNumber ( TQWidget * parent = 0, const char * name = 0 )
TQLCDNumber ( uint numDigits, TQWidget * parent = 0, const char * name = 0 )
~TQLCDNumber ()
enum Mode { Hex, Dec, Oct, Bin, HEX = Hex, DEC = Dec, OCT = Oct, 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 ( const TQString & s )
void display ( int num )
void display ( double num )
virtual void setHexMode ()
virtual void setDecMode ()
virtual void setOctMode ()
virtual void setBinMode ()
virtual void setSmallDecimalPoint ( bool )

Signals

void overflow ()

Properties

int intValue - the displayed value rounded to the nearest integer
Mode mode - the current display mode (number base)
int numDigits - the current number of digits displayed
SegmentStyle segmentStyle - the style of the LCDNumber
bool smallDecimalPoint - the style of the decimal point
double value - the displayed value

Protected Members

virtual void drawContents ( TQPainter * p )

Detailed Description

The TQLCDNumber widget displays a number with LCD-like digits.

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().

TQLCDNumber 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. TQLCDNumber substitutes spaces for illegal characters.

It is not possible to retrieve the contents of a TQLCDNumber 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, TQLCDNumber is the very oldest part of TQt, tracing back to a BASIC program on the Sinclair Spectrum.

See also TQLabel, TQFrame, and Basic Widgets.

Member Type Documentation

TQLCDNumber::Mode

This type determines how numbers are shown.

TQLCDNumber::Hex - Hexadecimal
TQLCDNumber::Dec - Decimal
TQLCDNumber::Oct - Octal
TQLCDNumber::Bin - Binary

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

TQLCDNumber::SegmentStyle

This type determines the visual appearance of the TQLCDNumber widget.

TQLCDNumber::Outline - gives raised segments filled with the background brush.
TQLCDNumber::Filled - gives raised segments filled with the foreground brush.
TQLCDNumber::Flat - gives flat segments filled with the foreground brush.

Member Function Documentation

TQLCDNumber::TQLCDNumber ( TQWidget * 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 TQFrame constructor.

See also numDigits and smallDecimalPoint.

TQLCDNumber::TQLCDNumber ( uint numDigits, TQWidget * 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 TQFrame constructor.

See also numDigits and smallDecimalPoint.

TQLCDNumber::~TQLCDNumber ()

Destroys the LCD number.

bool TQLCDNumber::checkOverflow ( double num ) const

Returns TRUE if num is too big to be displayed in its entirety; otherwise returns FALSE.

See also display(), numDigits, and smallDecimalPoint.

bool TQLCDNumber::checkOverflow ( int num ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if num is too big to be displayed in its entirety; otherwise returns FALSE.

See also display(), numDigits, and smallDecimalPoint.

void TQLCDNumber::display ( const TQString & s ) `[slot]`

Displays the number represented by the string s.

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

Examples: rangecontrols/rangecontrols.cpp, t12/lcdrange.cpp, t13/gamebrd.cpp, t5/main.cpp, t6/main.cpp, t7/lcdrange.cpp, and xform/xform.cpp.

void TQLCDNumber::display ( int num ) `[slot]`

Sets the displayed value rounded to the nearest integer to num. See the "intValue" property for details.

void TQLCDNumber::display ( double num ) `[slot]`

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Displays the number num.

void TQLCDNumber::drawContents ( TQPainter * p ) `[virtual protected]`

Draws the LCD number using painter p. This function is called from TQFrame::paintEvent().

Reimplemented from TQFrame.

int TQLCDNumber::intValue () const

Returns the displayed value rounded to the nearest integer. See the "intValue" property for details.

Mode TQLCDNumber::mode () const

Returns the current display mode (number base). See the "mode" property for details.

int TQLCDNumber::numDigits () const

Returns the current number of digits displayed. See the "numDigits" property for details.

void TQLCDNumber::overflow () `[signal]`

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

It is never emitted by setNumDigits().

SegmentStyle TQLCDNumber::segmentStyle () const

Returns the style of the LCDNumber. See the "segmentStyle" property for details.

void TQLCDNumber::setBinMode () `[virtual slot]`

Calls setMode( BIN ). Provided for convenience (e.g. for connecting buttons to it).

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

void TQLCDNumber::setDecMode () `[virtual slot]`

Calls setMode( DEC ). Provided for convenience (e.g. for connecting buttons to it).

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

void TQLCDNumber::setHexMode () `[virtual slot]`

Calls setMode( HEX ). Provided for convenience (e.g. for connecting buttons to it).

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

void TQLCDNumber::setMode ( Mode ) `[virtual]`

Sets the current display mode (number base). See the "mode" property for details.

void TQLCDNumber::setNumDigits ( int nDigits ) `[virtual]`

Sets the current number of digits displayed to nDigits. See the "numDigits" property for details.

void TQLCDNumber::setOctMode () `[virtual slot]`

Calls setMode( OCT ). Provided for convenience (e.g. for connecting buttons to it).

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

void TQLCDNumber::setSegmentStyle ( SegmentStyle ) `[virtual]`

Sets the style of the LCDNumber. See the "segmentStyle" property for details.

void TQLCDNumber::setSmallDecimalPoint ( bool ) `[virtual slot]`

Sets the style of the decimal point. See the "smallDecimalPoint" property for details.

bool TQLCDNumber::smallDecimalPoint () const

Returns the style of the decimal point. See the "smallDecimalPoint" property for details.

double TQLCDNumber::value () const

Returns the displayed value. See the "value" property for details.

Property Documentation

int intValue

This property holds the displayed value rounded to the nearest integer.

This property corresponds to the nearest integer to the current value displayed by the LCDNumber. This is the value used for hexadecimal, octal and binary modes.

If the displayed value is not a number, the property has a value of 0.

Set this property's value with display() and get this property's value with intValue().

Mode mode

This property holds the current display mode (number base).

Corresponds to the current display mode, which is one of BIN, OCT, DEC (the default) and HEX. DEC mode can display floating point values, the other modes display the integer equivalent.

See also smallDecimalPoint, setHexMode(), setDecMode(), setOctMode(), and setBinMode().

Set this property's value with setMode() and get this property's value with mode().

int numDigits

This property holds the current number of digits displayed.

Corresponds to the current number of digits. If TQLCDNumber::smallDecimalPoint is FALSE, the decimal point occupies one digit position.

SegmentStyle segmentStyle

This property holds the style of the LCDNumber.

Style	Result
Outline	Produces raised segments filled with the background color (this is the default).
Filled	Produces raised segments filled with the foreground color.
Flat	Produces flat segments filled with the foreground color.

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

Set this property's value with setSegmentStyle() and get this property's value with segmentStyle().

bool smallDecimalPoint

This property holds the style of the decimal point.

If TRUE the decimal point is drawn between two digit positions. Otherwise it occupies a digit position of its own, i.e. is drawn in a digit position. The default is FALSE.

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

double value

This property holds the displayed value.

This property corresponds to the current value displayed by the LCDNumber.