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java.lang.Objectcom.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.gui.QWidget
com.trolltech.qt.gui.QFrame
com.trolltech.qt.gui.QLCDNumber
public class QLCDNumber
The QLCDNumber 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()
.
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 Sinclair Spectrum.
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LCD number widgets shown in various widget styles (from left to right): Motif, CDE, Windows, Windows XP, Macintosh, Plastique. |
QLabel
, QFrame
, Digital Clock Example, and Tetrix Example.
Nested Class Summary | |
---|---|
static class |
QLCDNumber.Mode
This type determines how numbers are shown. |
static class |
QLCDNumber.SegmentStyle
This type determines the visual appearance of the QLCDNumber widget. |
Nested classes/interfaces inherited from class com.trolltech.qt.gui.QFrame |
---|
QFrame.Shadow, QFrame.Shape, QFrame.StyleMask |
Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
---|
QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Field Summary | |
---|---|
QSignalEmitter.Signal0 |
overflow
This signal is emitted whenever the QLCDNumber is asked to display a too-large number or a too-long string. |
Fields inherited from class com.trolltech.qt.gui.QWidget |
---|
customContextMenuRequested |
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
currentSender |
Constructor Summary | |
---|---|
QLCDNumber()
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. |
|
QLCDNumber(int numDigits)
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. |
|
QLCDNumber(int numDigits,
QWidget parent)
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. |
|
QLCDNumber(QWidget parent)
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. |
Method Summary | |
---|---|
boolean |
checkOverflow(double num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false. |
boolean |
checkOverflow(int num)
This is an overloaded member function, provided for convenience. |
void |
display(double num)
This property holds the displayed value rounded to the nearest integer. |
void |
display(int num)
This property holds the displayed value rounded to the nearest integer. |
void |
display(java.lang.String str)
This property holds the displayed value rounded to the nearest integer. |
int |
intValue()
This property holds the displayed value rounded to the nearest integer. |
QLCDNumber.Mode |
mode()
This property holds the current display mode (number base). |
int |
numDigits()
This property holds the current number of digits displayed. |
QLCDNumber.SegmentStyle |
segmentStyle()
This property holds the style of the LCDNumber. |
void |
setBinMode()
Calls setMode(Bin). |
void |
setDecMode()
Calls setMode(Dec). |
void |
setHexMode()
Calls setMode(Hex). |
void |
setMode(QLCDNumber.Mode arg__1)
This property holds the current display mode (number base). |
void |
setNumDigits(int nDigits)
This property holds the current number of digits displayed. |
void |
setOctMode()
Calls setMode(Oct). |
void |
setSegmentStyle(QLCDNumber.SegmentStyle arg__1)
This property holds the style of the LCDNumber. |
void |
setSmallDecimalPoint(boolean arg__1)
This property holds the style of the decimal point. |
boolean |
smallDecimalPoint()
This property holds the style of the decimal point. |
double |
value()
This property holds the displayed value. |
Methods inherited from class com.trolltech.qt.gui.QFrame |
---|
frameRect, frameShadow, frameShape, frameStyle, frameWidth, lineWidth, midLineWidth, setFrameRect, setFrameShadow, setFrameShape, setFrameStyle, setLineWidth, setMidLineWidth |
Methods inherited from class com.trolltech.qt.core.QObject |
---|
childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty |
Methods inherited from class com.trolltech.qt.QtJambiObject |
---|
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
---|
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
---|
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
---|
clone, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
---|
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Field Detail |
---|
public final QSignalEmitter.Signal0 overflow
It is never emitted by setNumDigits()
.
Constructor Detail |
---|
public QLCDNumber()
segmentStyle()
is set to Outline. The parent argument is passed to the QFrame
constructor.
setNumDigits()
, and setSmallDecimalPoint()
.
public QLCDNumber(QWidget parent)
segmentStyle()
is set to Outline. The parent argument is passed to the QFrame
constructor.
setNumDigits()
, and setSmallDecimalPoint()
.
public QLCDNumber(int numDigits)
segmentStyle()
is set to Outline. The parent argument is passed to the QFrame
constructor.
setNumDigits()
, and setSmallDecimalPoint()
.
public QLCDNumber(int numDigits, QWidget parent)
segmentStyle()
is set to Outline. The parent argument is passed to the QFrame
constructor.
setNumDigits()
, and setSmallDecimalPoint()
.
Method Detail |
---|
public final boolean checkOverflow(double num)
display()
, numDigits()
, and smallDecimalPoint()
.
public final boolean checkOverflow(int num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false.
display()
, numDigits()
, and smallDecimalPoint()
.
public final void display(java.lang.String str)
If the displayed value is not a number, the property has a value of 0.
By default, this property contains a value of 0.
public final void display(double num)
If the displayed value is not a number, the property has a value of 0.
By default, this property contains a value of 0.
public final void display(int num)
If the displayed value is not a number, the property has a value of 0.
By default, this property contains a value of 0.
public final int intValue()
If the displayed value is not a number, the property has a value of 0.
By default, this property contains a value of 0.
public final QLCDNumber.Mode mode()
smallDecimalPoint()
, setHexMode()
, setDecMode()
, setOctMode()
, and setBinMode()
.
public final int numDigits()
QLCDNumber::smallDecimalPoint
is false, the decimal point occupies one digit position. By default, this property contains a value of 5.
smallDecimalPoint
.
public final QLCDNumber.SegmentStyle segmentStyle()
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. |
QPalette::light()
and QPalette::dark()
for shadow effects.
public final void setBinMode()
setMode()
, setHexMode()
, setDecMode()
, setOctMode()
, and mode()
.
public final void setDecMode()
setMode()
, setHexMode()
, setOctMode()
, setBinMode()
, and mode()
.
public final void setHexMode()
setMode()
, setDecMode()
, setOctMode()
, setBinMode()
, and mode()
.
public final void setMode(QLCDNumber.Mode arg__1)
smallDecimalPoint()
, setHexMode()
, setDecMode()
, setOctMode()
, and setBinMode()
.
public final void setNumDigits(int nDigits)
QLCDNumber::smallDecimalPoint
is false, the decimal point occupies one digit position. By default, this property contains a value of 5.
smallDecimalPoint
.
public final void setOctMode()
setMode()
, setHexMode()
, setDecMode()
, setBinMode()
, and mode()
.
public final void setSegmentStyle(QLCDNumber.SegmentStyle arg__1)
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. |
QPalette::light()
and QPalette::dark()
for shadow effects.
public final void setSmallDecimalPoint(boolean arg__1)
The inter-digit space is made slightly wider when the decimal point is drawn between the digits.
mode
.
public final boolean smallDecimalPoint()
The inter-digit space is made slightly wider when the decimal point is drawn between the digits.
mode
.
public final double value()
If the displayed value is not a number, the property has a value of 0.
By default, this property contains a value of 0.
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