class QLCDNumber

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

Inheritance diagram of PySide6.QtWidgets.QLCDNumber

Synopsis

Properties

Methods

Slots

Signals

Note

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Detailed Description

../../_images/windows-lcdnumber.png

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 setDigitCount() , 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 Sinclair Spectrum .

See also

QLabel QFrame

class Mode

This type determines how numbers are shown.

Constant

Description

QLCDNumber.Hex

Hexadecimal

QLCDNumber.Dec

Decimal

QLCDNumber.Oct

Octal

QLCDNumber.Bin

Binary

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

class SegmentStyle

This type determines the visual appearance of the QLCDNumber widget.

Constant

Description

QLCDNumber.Outline

gives raised segments filled with the background color.

QLCDNumber.Filled

gives raised segments filled with the windowText color.

QLCDNumber.Flat

gives flat segments filled with the windowText color.

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property digitCountᅟ: int

This property holds the current number of digits displayed.

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

By default, this property contains a value of 5.

Access functions:
property intValueᅟ: int

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.

By default, this property contains a value of 0.

Access functions:
property modeᅟ: QLCDNumber.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.

Access functions:
property segmentStyleᅟ: QLCDNumber.SegmentStyle

This property holds the style of the LCDNumber..

Style

Result

Outline

Produces raised segments filled with the background color

Filled (this is the default).

Produces raised segments filled with the foreground color.

Flat

Produces flat segments filled with the foreground color.

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

Access functions:
property smallDecimalPointᅟ: bool

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.

See also

mode

Access functions:
property valueᅟ: float

This property holds the displayed value.

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

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

By default, this property contains a value of 0.

Access functions:
__init__([parent=None])
Parameters:

parent – QWidget

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 argument is passed to the QFrame constructor.

__init__(numDigits[, parent=None])
Parameters:

  • numDigits – int

  • parent – QWidget

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 Filled.

The parent argument is passed to the QFrame constructor.

checkOverflow(num)
Parameters:

num – float

Return type:

bool

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

checkOverflow(num)
Parameters:

num – int

Return type:

bool

This is an overloaded function.

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

digitCount()
Return type:

int

Returns the current number of digits.

See also

setDigitCount()

Getter of property digitCountᅟ .

display(str)
Parameters:

str – str

Displays the number represented by the string s.

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.

display(num)
Parameters:

num – float

This is an overloaded function.

Displays the number num.

Setter of property valueᅟ .

display(num)
Parameters:

num – int

This is an overloaded function.

Displays the number num.

intValue()
Return type:

int

Getter of property intValueᅟ .

mode()
Return type:

Mode

See also

setMode()

Getter of property modeᅟ .

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 setDigitCount() .

segmentStyle()
Return type:

SegmentStyle

See also

setSegmentStyle()

Getter of property segmentStyleᅟ .

setBinMode()

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

setDecMode()

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

setDigitCount(nDigits)
Parameters:

nDigits – int

Sets the current number of digits to numDigits. Must be in the range 0..99.

See also

digitCount()

Setter of property digitCountᅟ .

setHexMode()

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

setMode(arg__1)
Parameters:

arg__1 – Mode

See also

mode()

Setter of property modeᅟ .

setOctMode()

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

setSegmentStyle(arg__1)
Parameters:

arg__1 – SegmentStyle

See also

segmentStyle()

Setter of property segmentStyleᅟ .

setSmallDecimalPoint(arg__1)
Parameters:

arg__1 – bool

See also

smallDecimalPoint()

Setter of property smallDecimalPointᅟ .

smallDecimalPoint()
Return type:

bool

See also

setSmallDecimalPoint()

Getter of property smallDecimalPointᅟ .

value()
Return type:

float

Getter of property valueᅟ .