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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.QAbstractSpinBox
com.trolltech.qt.gui.QDoubleSpinBox
public class QDoubleSpinBox
The QDoubleSpinBox class provides a spin box widget that takes doubles.
QDoubleSpinBox allows the user to choose a value by clicking the up and down buttons or by pressing Up or Down on the keyboard to increase or decrease the value currently displayed. The user can also type the value in manually. The spin box supports double values but can be extended to use different strings with validate, textFromValue and valueFromText.
Every time the value changes QDoubleSpinBox emits the valueChanged signal. The current value can be fetched with value and set with setValue.
Note: QDoubleSpinBox will round numbers so they can be displayed with the current precision. In a QDoubleSpinBox with decimals set to 2, calling setValue(2.555) will cause value to return 2.56.
Clicking the up and down buttons or using the keyboard accelerator's Up and Down arrows will increase or decrease the current value in steps of size singleStep. If you want to change this behavior you can reimplement the virtual function stepBy. The minimum and maximum value and the step size can be set using one of the constructors, and can be changed later with setMinimum, setMaximum and setSingleStep. The spinbox has a default precision of 2 decimal places but this can be changed using setDecimals.
Most spin boxes are directional, but QDoubleSpinBox can also operate as a circular spin box, i.e. if the range is 0.0-99.9 and the current value is 99.9, clicking "up" will give 0 if wrapping is set to true. Use setWrapping if you want circular behavior.
The displayed value can be prepended and appended with arbitrary strings indicating, for example, currency or the unit of measurement. See setPrefix and setSuffix. The text in the spin box is retrieved with text (which includes any prefix and suffix), or with cleanText (which has no prefix, no suffix and no leading or trailing whitespace).
It is often desirable to give the user a special (often default) choice in addition to the range of numeric values. See setSpecialValueText for how to do this with QDoubleSpinBox.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.gui.QAbstractSpinBox |
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QAbstractSpinBox.ButtonSymbols, QAbstractSpinBox.CorrectionMode, QAbstractSpinBox.StepEnabled, QAbstractSpinBox.StepEnabledFlag |
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.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.Signal1<java.lang.Double> |
valueChanged
This signal is emitted whenever the spin box's value is changed. |
QSignalEmitter.Signal1<java.lang.String> |
valueStringChanged
The new value is passed literally in arg__1 with no prefix or suffix. |
Fields inherited from class com.trolltech.qt.gui.QAbstractSpinBox |
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editingFinished |
Fields inherited from class com.trolltech.qt.gui.QWidget |
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customContextMenuRequested |
Constructor Summary | |
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QDoubleSpinBox()
Equivalent to QDoubleSpinBox(0). |
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QDoubleSpinBox(QWidget parent)
Constructs a spin box with 0.0 as minimum value and 99.99 as maximum value, a step value of 1.0 and a precision of 2 decimal places. |
Method Summary | |
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java.lang.String |
cleanText()
Returns the text of the spin box excluding any prefix, suffix, or leading or trailing whitespace.. |
int |
decimals()
Returns the precision of the spin box, in decimals. |
java.lang.String |
fixup(java.lang.String str)
This function is reimplemented for internal reasons. |
static QDoubleSpinBox |
fromNativePointer(QNativePointer nativePointer)
This function returns the QDoubleSpinBox instance pointed to by nativePointer |
double |
maximum()
Returns the maximum value of the spin box. |
double |
minimum()
Returns the minimum value of the spin box. |
java.lang.String |
prefix()
Returns the spin box's prefix. |
void |
setDecimals(int prec)
Sets the precision of the spin box, in decimals to prec. |
void |
setMaximum(double max)
Sets the maximum value of the spin box to max. |
void |
setMinimum(double min)
Sets the minimum value of the spin box to min. |
void |
setPrefix(java.lang.String prefix)
Sets the spin box's prefix to prefix. |
void |
setRange(double min,
double max)
Convenience function to set the min and max values with a single function call. |
void |
setSingleStep(double val)
Sets the step value to val. |
void |
setSuffix(java.lang.String suffix)
Sets the suffix of the spin box to suffix. |
void |
setValue(double val)
Sets the value of the spin box to val. |
double |
singleStep()
Returns the step value. |
java.lang.String |
suffix()
Returns the suffix of the spin box. |
java.lang.String |
textFromValue(double val)
This virtual function is used by the spin box whenever it needs to display the given val. |
QValidator.State |
validate(QValidator.QValidationData input)
Equivalent to validate(input, ). |
double |
value()
Returns the value of the spin box. |
double |
valueFromText(java.lang.String text)
This virtual function is used by the spin box whenever it needs to interpret text entered by the user as a value. |
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 |
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.Signal1<java.lang.Double> valueChanged
This signal is emitted whenever the spin box's value is changed. The new value is passed in arg__1.
public final QSignalEmitter.Signal1<java.lang.String> valueStringChanged
The new value is passed literally in arg__1 with no prefix or suffix.
Constructor Detail |
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public QDoubleSpinBox()
Equivalent to QDoubleSpinBox(0).
public QDoubleSpinBox(QWidget parent)
Constructs a spin box with 0.0 as minimum value and 99.99 as maximum value, a step value of 1.0 and a precision of 2 decimal places. The value is initially set to 0.00. The spin box has the given parent.
Method Detail |
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public final java.lang.String cleanText()
Returns the text of the spin box excluding any prefix, suffix, or leading or trailing whitespace..
public final int decimals()
Returns the precision of the spin box, in decimals.
Sets how many decimals the spinbox will use for displaying and interpreting doubles.
Warning: The results might not be reliable with very high values for decimals.
Note: The maximum, minimum and value might change as a result of changing this property.
public final double maximum()
Returns the maximum value of the spin box.
When setting this property the minimum is adjusted if necessary, to ensure that the range remains valid.
The default maximum value is 99.99.
Note: The maximum value will be rounded to match the decimals property.
public final double minimum()
Returns the minimum value of the spin box.
When setting this property the maximum is adjusted if necessary to ensure that the range remains valid.
The default minimum value is 0.0.
Note: The minimum value will be rounded to match the decimals property.
public final java.lang.String prefix()
Returns the spin box's prefix.
The prefix is prepended to the start of the displayed value. Typical use is to display a unit of measurement or a currency symbol. For example:
spinbox->setPrefix("$");
To turn off the prefix display, set this property to an empty string. The default is no prefix. The prefix is not displayed when value == minimum and specialValueText is set.
If no prefix is set, prefix returns an empty string.
public final void setDecimals(int prec)
Sets the precision of the spin box, in decimals to prec.
Sets how many decimals the spinbox will use for displaying and interpreting doubles.
Warning: The results might not be reliable with very high values for decimals.
Note: The maximum, minimum and value might change as a result of changing this property.
public final void setMaximum(double max)
Sets the maximum value of the spin box to max.
When setting this property the minimum is adjusted if necessary, to ensure that the range remains valid.
The default maximum value is 99.99.
Note: The maximum value will be rounded to match the decimals property.
public final void setMinimum(double min)
Sets the minimum value of the spin box to min.
When setting this property the maximum is adjusted if necessary to ensure that the range remains valid.
The default minimum value is 0.0.
Note: The minimum value will be rounded to match the decimals property.
public final void setPrefix(java.lang.String prefix)
Sets the spin box's prefix to prefix.
The prefix is prepended to the start of the displayed value. Typical use is to display a unit of measurement or a currency symbol. For example:
spinbox->setPrefix("$");
To turn off the prefix display, set this property to an empty string. The default is no prefix. The prefix is not displayed when value == minimum and specialValueText is set.
If no prefix is set, prefix returns an empty string.
public final void setRange(double min, double max)
Convenience function to set the min and max values with a single function call.
Note: The maximum and minimum values will be rounded to match the decimals property.
setRange(minimum, maximum);
is equivalent to:
setMinimum(minimum); setMaximum(maximum);
public final void setSingleStep(double val)
Sets the step value to val.
When the user uses the arrows to change the spin box's value the value will be incremented/decremented by the amount of the singleStep. The default value is 1.0. Setting a singleStep value of less than 0 does nothing.
public final void setSuffix(java.lang.String suffix)
Sets the suffix of the spin box to suffix.
The suffix is appended to the end of the displayed value. Typical use is to display a unit of measurement or a currency symbol. For example:
spinbox->setSuffix(" km");
To turn off the suffix display, set this property to an empty string. The default is no suffix. The suffix is not displayed for the minimum if specialValueText is set.
If no suffix is set, suffix returns an empty string.
public final void setValue(double val)
Sets the value of the spin box to val.
setValue will emit valueChanged if the new value is different from the old one.
Note: The value will be rounded so it can be displayed with the current setting of decimals.
public final double singleStep()
Returns the step value.
When the user uses the arrows to change the spin box's value the value will be incremented/decremented by the amount of the singleStep. The default value is 1.0. Setting a singleStep value of less than 0 does nothing.
public final java.lang.String suffix()
Returns the suffix of the spin box.
The suffix is appended to the end of the displayed value. Typical use is to display a unit of measurement or a currency symbol. For example:
spinbox->setSuffix(" km");
To turn off the suffix display, set this property to an empty string. The default is no suffix. The suffix is not displayed for the minimum if specialValueText is set.
If no suffix is set, suffix returns an empty string.
public final double value()
Returns the value of the spin box.
setValue will emit valueChanged if the new value is different from the old one.
Note: The value will be rounded so it can be displayed with the current setting of decimals.
public java.lang.String fixup(java.lang.String str)
This function is reimplemented for internal reasons.
fixup
in class QAbstractSpinBox
public java.lang.String textFromValue(double val)
This virtual function is used by the spin box whenever it needs to display the given val. The default implementation returns a string containing val printed using QLocale().toString(val, QLatin1Char('f'), decimals) and will remove the thousand separator. Reimplementations may return anything.
Note: QDoubleSpinBox does not call this function for specialValueText and that neither prefix nor suffix should be included in the return value.
If you reimplement this, you may also need to reimplement valueFromText.
public QValidator.State validate(QValidator.QValidationData input)
Equivalent to validate(input, ).
validate
in class QAbstractSpinBox
public double valueFromText(java.lang.String text)
This virtual function is used by the spin box whenever it needs to interpret text entered by the user as a value.
Subclasses that need to display spin box values in a non-numeric way need to reimplement this function.
Note: QDoubleSpinBox handles specialValueText separately; this function is only concerned with the other values.
public static QDoubleSpinBox fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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