com.trolltech.qt.gui
Class QLCDNumber

java.lang.Object
  extended by com.trolltech.qt.internal.QSignalEmitterInternal
      extended by com.trolltech.qt.QSignalEmitter
          extended by com.trolltech.qt.QtJambiObject
              extended by com.trolltech.qt.core.QObject
                  extended by com.trolltech.qt.gui.QWidget
                      extended by com.trolltech.qt.gui.QFrame
                          extended by com.trolltech.qt.gui.QLCDNumber
All Implemented Interfaces:
QPaintDeviceInterface, QtJambiInterface

public class QLCDNumber
extends QFrame

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.













LCD number widgets shown in various widget styles (from left to right): Motif, CDE, Windows, Windows XP, Macintosh, Plastique.

See also:
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.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9
 
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.gui.QWidget
acceptDrops, accessibleDescription, accessibleName, actionEvent, actions, activateWindow, addAction, addActions, adjustSize, autoFillBackground, backgroundRole, baseSize, changeEvent, childAt, childAt, childrenRect, childrenRegion, clearFocus, clearMask, close, closeEvent, contentsRect, contextMenuEvent, contextMenuPolicy, cursor, depth, destroy, destroy, destroy, dragEnterEvent, dragLeaveEvent, dragMoveEvent, dropEvent, effectiveWinId, ensurePolished, enterEvent, focusInEvent, focusNextChild, focusNextPrevChild, focusOutEvent, focusPolicy, focusPreviousChild, focusProxy, focusWidget, font, fontInfo, fontMetrics, foregroundRole, frameGeometry, frameSize, geometry, getContentsMargins, grabKeyboard, grabMouse, grabMouse, grabShortcut, grabShortcut, graphicsProxyWidget, hasFocus, hasMouseTracking, height, heightForWidth, heightMM, hide, hideEvent, inputContext, inputMethodEvent, inputMethodQuery, insertAction, insertActions, isActiveWindow, isAncestorOf, isEnabled, isEnabledTo, isFullScreen, isHidden, isMaximized, isMinimized, isModal, isVisible, isVisibleTo, isWindow, isWindowModified, keyboardGrabber, keyPressEvent, keyReleaseEvent, languageChange, layout, layoutDirection, leaveEvent, locale, logicalDpiX, logicalDpiY, lower, mapFrom, mapFromGlobal, mapFromParent, mapTo, mapToGlobal, mapToParent, mask, maximumHeight, maximumSize, maximumWidth, metric, minimumHeight, minimumSize, minimumSizeHint, minimumWidth, mouseDoubleClickEvent, mouseGrabber, mouseMoveEvent, mousePressEvent, mouseReleaseEvent, move, move, moveEvent, nativeParentWidget, nextInFocusChain, normalGeometry, numColors, overrideWindowFlags, overrideWindowFlags, overrideWindowState, paintEngine, paintEvent, paintingActive, palette, parentWidget, physicalDpiX, physicalDpiY, pos, raise, rect, releaseKeyboard, releaseMouse, releaseShortcut, removeAction, render, render, render, render, render, render, render, render, render, repaint, repaint, repaint, repaint, resetInputContext, resize, resize, resizeEvent, restoreGeometry, saveGeometry, scroll, scroll, setAcceptDrops, setAccessibleDescription, setAccessibleName, setAttribute, setAttribute, setAutoFillBackground, setBackgroundRole, setBaseSize, setBaseSize, setContentsMargins, setContentsMargins, setContextMenuPolicy, setCursor, setDisabled, setEnabled, setFixedHeight, setFixedSize, setFixedSize, setFixedWidth, setFocus, setFocus, setFocusPolicy, setFocusProxy, setFont, setForegroundRole, setGeometry, setGeometry, setHidden, setInputContext, setLayout, setLayoutDirection, setLocale, setMask, setMask, setMaximumHeight, setMaximumSize, setMaximumSize, setMaximumWidth, setMinimumHeight, setMinimumSize, setMinimumSize, setMinimumWidth, setMouseTracking, setPalette, setParent, setParent, setParent, setShortcutAutoRepeat, setShortcutAutoRepeat, setShortcutEnabled, setShortcutEnabled, setSizeIncrement, setSizeIncrement, setSizePolicy, setSizePolicy, setStatusTip, setStyle, setStyleSheet, setTabOrder, setToolTip, setUpdatesEnabled, setVisible, setWhatsThis, setWindowFilePath, setWindowFlags, setWindowFlags, setWindowIcon, setWindowIconText, setWindowModality, setWindowModified, setWindowOpacity, setWindowRole, setWindowState, setWindowState, setWindowTitle, show, showEvent, showFullScreen, showMaximized, showMinimized, showNormal, size, sizeHint, sizeIncrement, sizePolicy, stackUnder, statusTip, style, styleSheet, tabletEvent, testAttribute, toolTip, underMouse, unsetCursor, unsetLayoutDirection, unsetLocale, update, update, update, update, updateGeometry, updateMicroFocus, updatesEnabled, visibleRegion, whatsThis, wheelEvent, width, widthMM, window, windowFilePath, windowFlags, windowIcon, windowIconText, windowModality, windowOpacity, windowRole, windowState, windowTitle, windowType, winId, x, y
 
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

overflow

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

QLCDNumber

public 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. The segmentStyle() is set to Outline.

The parent argument is passed to the QFrame constructor.

See also:
setNumDigits(), and setSmallDecimalPoint().


QLCDNumber

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.

See also:
setNumDigits(), and setSmallDecimalPoint().


QLCDNumber

public 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. The segmentStyle() is set to Outline.

The parent argument is passed to the QFrame constructor.

See also:
setNumDigits(), and setSmallDecimalPoint().


QLCDNumber

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.

See also:
setNumDigits(), and setSmallDecimalPoint().

Method Detail

checkOverflow

public final boolean checkOverflow(double num)
Returns true if num is too big to be displayed in its entirety; otherwise returns false.

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


checkOverflow

public final boolean checkOverflow(int num)
This is an overloaded member function, provided for convenience.

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

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


display

public final void display(java.lang.String str)
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.


display

public final void display(double num)
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.


display

public final void display(int num)
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.


intValue

public final 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.

By default, this property contains a value of 0.


mode

public final QLCDNumber.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().


numDigits

public final int numDigits()
This property holds 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.

By default, this property contains a value of 5.

See also:
smallDecimalPoint.


segmentStyle

public final QLCDNumber.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 QPalette::light() and QPalette::dark() for shadow effects.


setBinMode

public final void setBinMode()
Calls setMode(Bin). Provided for convenience (e.g. for connecting buttons to it).

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


setDecMode

public final void setDecMode()
Calls setMode(Dec). Provided for convenience (e.g. for connecting buttons to it).

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


setHexMode

public final void setHexMode()
Calls setMode(Hex). Provided for convenience (e.g. for connecting buttons to it).

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


setMode

public final void setMode(QLCDNumber.Mode arg__1)
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().


setNumDigits

public final void setNumDigits(int nDigits)
This property holds 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.

By default, this property contains a value of 5.

See also:
smallDecimalPoint.


setOctMode

public final void setOctMode()
Calls setMode(Oct). Provided for convenience (e.g. for connecting buttons to it).

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


setSegmentStyle

public final void setSegmentStyle(QLCDNumber.SegmentStyle arg__1)
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 QPalette::light() and QPalette::dark() for shadow effects.


setSmallDecimalPoint

public final void setSmallDecimalPoint(boolean arg__1)
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.


smallDecimalPoint

public final boolean 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.

See also:
mode.


value

public final double value()
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.