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java.lang.Objectcom.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. |
Clock Example
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Tetrix ExampleNested Class Summary | |
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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 |
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QFrame.Shadow, QFrame.Shape, QFrame.StyleMask |
Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
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QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Field Summary | |
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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 |
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customContextMenuRequested |
Constructor Summary | |
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QLCDNumber()
Equivalent to QLCDNumber(0). |
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QLCDNumber(int numDigits)
Equivalent to QLCDNumber(numDigits, 0). |
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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. |
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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 | |
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boolean |
checkOverflow(double num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false. |
boolean |
checkOverflow(int num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false. |
void |
display(double num)
Sets the displayed value rounded to the nearest integer to num. |
void |
display(int num)
Sets the displayed value rounded to the nearest integer to num. |
void |
display(java.lang.String str)
Sets the displayed value rounded to the nearest integer to str. |
boolean |
event(QEvent e)
This function is reimplemented for internal reasons. |
static QLCDNumber |
fromNativePointer(QNativePointer nativePointer)
This function returns the QLCDNumber instance pointed to by nativePointer |
int |
intValue()
Returns the displayed value rounded to the nearest integer. |
QLCDNumber.Mode |
mode()
Returns the current display mode (number base). |
int |
numDigits()
Returns the current number of digits displayed. |
protected void |
paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons. |
QLCDNumber.SegmentStyle |
segmentStyle()
Returns 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)
Sets the current display mode (number base) to arg__1. |
void |
setNumDigits(int nDigits)
Sets the current number of digits displayed to nDigits. |
void |
setOctMode()
Calls setMode(Oct). |
void |
setSegmentStyle(QLCDNumber.SegmentStyle arg__1)
Sets the style of the LCDNumber to arg__1. |
void |
setSmallDecimalPoint(boolean arg__1)
Sets the style of the decimal point to arg__1. |
QSize |
sizeHint()
This function is reimplemented for internal reasons. |
boolean |
smallDecimalPoint()
Returns the style of the decimal point. |
double |
value()
Returns the displayed value. |
Methods inherited from class com.trolltech.qt.gui.QFrame |
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changeEvent, drawFrame, frameRect, frameShadow, frameShape, frameStyle, frameWidth, lineWidth, midLineWidth, setFrameRect, setFrameShadow, setFrameShape, setFrameStyle, setLineWidth, setMidLineWidth |
Methods inherited from class com.trolltech.qt.core.QObject |
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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Field Detail |
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public final QSignalEmitter.Signal0 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.
Constructor Detail |
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public QLCDNumber()
Equivalent to QLCDNumber(0).
public 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. The segmentStyle is set to Outline.
The parent argument is passed to the QFrame constructor.
public QLCDNumber(int numDigits)
Equivalent to QLCDNumber(numDigits, 0).
public 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. The segmentStyle is set to Outline.
The parent argument is passed to the QFrame constructor.
Method Detail |
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public final boolean checkOverflow(int num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false.
public final boolean checkOverflow(double num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false.
public final void display(java.lang.String str)
Sets the displayed value rounded to the nearest integer to str.
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.
public final void display(double num)
Sets the displayed value rounded to the nearest integer to num.
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.
public final void display(int num)
Sets the displayed value rounded to the nearest integer to num.
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.
public final int intValue()
Returns 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.
public final QLCDNumber.Mode mode()
Returns 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.
public final int numDigits()
Returns the current number of digits displayed.
Corresponds to the current number of digits. If QLCDNumber::smallDecimalPoint is false, the decimal point occupies one digit position.
public final QLCDNumber.SegmentStyle segmentStyle()
Returns the style of the LCDNumber.
Style | Result |
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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 QPalette::light() and QPalette::dark() for shadow effects.
public final void setBinMode()
Calls setMode(Bin). Provided for convenience (e.g. for connecting buttons to it).
public final void setDecMode()
Calls setMode(Dec). Provided for convenience (e.g. for connecting buttons to it).
public final void setHexMode()
Calls setMode(Hex). Provided for convenience (e.g. for connecting buttons to it).
public final void setMode(QLCDNumber.Mode arg__1)
Sets the current display mode (number base) to arg__1.
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.
public final void setNumDigits(int nDigits)
Sets the current number of digits displayed to nDigits.
Corresponds to the current number of digits. If QLCDNumber::smallDecimalPoint is false, the decimal point occupies one digit position.
public final void setOctMode()
Calls setMode(Oct). Provided for convenience (e.g. for connecting buttons to it).
public final void setSegmentStyle(QLCDNumber.SegmentStyle arg__1)
Sets the style of the LCDNumber to arg__1.
Style | Result |
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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 QPalette::light() and QPalette::dark() for shadow effects.
public final void setSmallDecimalPoint(boolean arg__1)
Sets the style of the decimal point to arg__1.
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.
public final boolean smallDecimalPoint()
Returns 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.
public final double value()
Returns 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.
public boolean event(QEvent e)
This function is reimplemented for internal reasons.
event
in class QFrame
protected void paintEvent(QPaintEvent arg__1)
This function is reimplemented for internal reasons.
paintEvent
in class QFrame
public QSize sizeHint()
This function is reimplemented for internal reasons.
sizeHint
in class QFrame
public static QLCDNumber fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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