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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQDial Class Reference< / h1 >
< p > The TQDial class provides a rounded range control (like a speedometer or potentiometer).
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "tqdial-h.html" > tqdial.h< / a > > < / tt >
< p > Inherits < a href = "tqwidget.html" > TQWidget< / a > and < a href = "tqrangecontrol.html" > TQRangeControl< / a > .
< p > < a href = "tqdial-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQDial" > < b > TQDial< / b > < / a > ( TQWidget * parent = 0, const char * name = 0, WFlags f = 0 )< / li >
< li class = fn > < a href = "#TQDial-2" > < b > TQDial< / b > < / a > ( int minValue, int maxValue, int pageStep, int value, TQWidget * parent = 0, const char * name = 0 )< / li >
< li class = fn > < a href = "#~TQDial" > < b > ~TQDial< / b > < / a > ()< / li >
< li class = fn > bool < a href = "#tracking" > < b > tracking< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#wrapping" > < b > wrapping< / b > < / a > () const< / li >
< li class = fn > int < a href = "#notchSize" > < b > notchSize< / b > < / a > () const< / li >
< li class = fn > virtual void < a href = "#setNotchTarget" > < b > setNotchTarget< / b > < / a > ( double )< / li >
< li class = fn > double < a href = "#notchTarget" > < b > notchTarget< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#notchesVisible" > < b > notchesVisible< / b > < / a > () const< / li >
< li class = fn > int < a href = "#minValue" > < b > minValue< / b > < / a > () const< / li >
< li class = fn > int < a href = "#maxValue" > < b > maxValue< / b > < / a > () const< / li >
< li class = fn > void < a href = "#setMinValue" > < b > setMinValue< / b > < / a > ( int )< / li >
< li class = fn > void < a href = "#setMaxValue" > < b > setMaxValue< / b > < / a > ( int )< / li >
< li class = fn > int < a href = "#lineStep" > < b > lineStep< / b > < / a > () const< / li >
< li class = fn > int < a href = "#pageStep" > < b > pageStep< / b > < / a > () const< / li >
< li class = fn > void < a href = "#setLineStep" > < b > setLineStep< / b > < / a > ( int )< / li >
< li class = fn > void < a href = "#setPageStep" > < b > setPageStep< / b > < / a > ( int )< / li >
< li class = fn > int < a href = "#value" > < b > value< / b > < / a > () const< / li >
< / ul >
< h2 > Public Slots< / h2 >
< ul >
< li class = fn > virtual void < a href = "#setValue" > < b > setValue< / b > < / a > ( int )< / li >
< li class = fn > void < a href = "#addLine" > < b > addLine< / b > < / a > ()< / li >
< li class = fn > void < a href = "#subtractLine" > < b > subtractLine< / b > < / a > ()< / li >
< li class = fn > void < a href = "#addPage" > < b > addPage< / b > < / a > ()< / li >
< li class = fn > void < a href = "#subtractPage" > < b > subtractPage< / b > < / a > ()< / li >
< li class = fn > virtual void < a href = "#setNotchesVisible" > < b > setNotchesVisible< / b > < / a > ( bool b )< / li >
< li class = fn > virtual void < a href = "#setWrapping" > < b > setWrapping< / b > < / a > ( bool on )< / li >
< li class = fn > virtual void < a href = "#setTracking" > < b > setTracking< / b > < / a > ( bool enable )< / li >
< / ul >
< h2 > Signals< / h2 >
< ul >
< li class = fn > void < a href = "#valueChanged" > < b > valueChanged< / b > < / a > ( int value )< / li >
< li class = fn > void < a href = "#dialPressed" > < b > dialPressed< / b > < / a > ()< / li >
< li class = fn > void < a href = "#dialMoved" > < b > dialMoved< / b > < / a > ( int value )< / li >
< li class = fn > void < a href = "#dialReleased" > < b > dialReleased< / b > < / a > ()< / li >
< / ul >
< h2 > Properties< / h2 >
< ul >
< li class = fn > int < a href = "#lineStep-prop" > < b > lineStep< / b > < / a > - the current line step< / li >
< li class = fn > int < a href = "#maxValue-prop" > < b > maxValue< / b > < / a > - the current maximum value< / li >
< li class = fn > int < a href = "#minValue-prop" > < b > minValue< / b > < / a > - the current minimum value< / li >
< li class = fn > int < a href = "#notchSize-prop" > < b > notchSize< / b > < / a > - the current notch size < em > (read only)< / em > < / li >
< li class = fn > double < a href = "#notchTarget-prop" > < b > notchTarget< / b > < / a > - the target number of pixels between notches< / li >
< li class = fn > bool < a href = "#notchesVisible-prop" > < b > notchesVisible< / b > < / a > - whether the notches are shown< / li >
< li class = fn > int < a href = "#pageStep-prop" > < b > pageStep< / b > < / a > - the current page step< / li >
< li class = fn > bool < a href = "#tracking-prop" > < b > tracking< / b > < / a > - whether tracking is enabled< / li >
< li class = fn > int < a href = "#value-prop" > < b > value< / b > < / a > - the current dial value< / li >
< li class = fn > bool < a href = "#wrapping-prop" > < b > wrapping< / b > < / a > - whether wrapping is enabled< / li >
< / ul >
< h2 > Protected Members< / h2 >
< ul >
< li class = fn > virtual void < a href = "#valueChange" > < b > valueChange< / b > < / a > ()< / li >
< li class = fn > virtual void < a href = "#rangeChange" > < b > rangeChange< / b > < / a > ()< / li >
< li class = fn > virtual void < a href = "#repaintScreen" > < b > repaintScreen< / b > < / a > ( const TQRect * cr = 0 )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
< p > The TQDial class provides a rounded range control (like a speedometer or potentiometer).
< p >
< p > TQDial is used when the user needs to control a value within a
program-definable range, and the range either wraps around
(typically, 0..359 degrees) or the dialog layout needs a square
widget.
< p > Both API- and UI-wise, the dial is very similar to a < a href = "tqslider.html" > slider.< / a > Indeed, when < a href = "#wrapping" > wrapping< / a > () is FALSE (the default)
there is no real difference between a slider and a dial. They
have the same signals, slots and member functions, all of which do
the same things. Which one you use depends only on your taste
and on the application.
< p > The dial initially emits < a href = "#valueChanged" > valueChanged< / a > () signals continuously while
the slider is being moved; you can make it emit the signal less
often by calling < a href = "#setTracking" > setTracking< / a > (FALSE). < a href = "#dialMoved" > dialMoved< / a > () is emitted
continuously even when < a href = "#tracking" > tracking< / a > () is FALSE.
< p > The slider also emits < a href = "#dialPressed" > dialPressed< / a > () and < a href = "#dialReleased" > dialReleased< / a > () signals
when the mouse button is pressed and released. But note that the
dial's value can change without these signals being emitted; the
keyboard and wheel can be used to change the value.
< p > Unlike the slider, TQDial attempts to draw a "nice" number of
notches rather than one per < a href = "#lineStep" > lineStep< / a > (). If possible, the number
of notches drawn is one per lineStep(), but if there aren't enough
pixels to draw every one, TQDial will draw every second, third
etc., notch. < a href = "#notchSize" > notchSize< / a > () returns the number of units per notch,
hopefully a multiple of lineStep(); < a href = "#setNotchTarget" > setNotchTarget< / a > () sets the
target distance between neighbouring notches in pixels. The
default is 3.75 pixels.
< p > Like the slider, the dial makes the < a href = "tqrangecontrol.html" > TQRangeControl< / a > functions
< a href = "#setValue" > setValue< / a > (), < a href = "#addLine" > addLine< / a > (), < a href = "#subtractLine" > subtractLine< / a > (), < a href = "#addPage" > addPage< / a > () and
< a href = "#subtractPage" > subtractPage< / a > () available as slots.
< p > The dial's keyboard interface is fairly simple: The left/up and
right/down arrow keys move by lineStep(), page up and page down by
< a href = "#pageStep" > pageStep< / a > () and Home and End to < a href = "#minValue" > minValue< / a > () and < a href = "#maxValue" > maxValue< / a > ().
< p > < img src = tqdial-m.png > < img src = tqdial-w.png >
< p > < p > See also < a href = "tqscrollbar.html" > TQScrollBar< / a > , < a href = "tqspinbox.html" > TQSpinBox< / a > , < a href = "guibooks.html#fowler" > GUI Design Handbook: Slider< / a > , and < a href = "basic.html" > Basic Widgets< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQDial" > < / a > TQDial::TQDial ( < a href = "tqwidget.html" > TQWidget< / a > * parent = 0, const char * name = 0, WFlags f = 0 )
< / h3 >
Constructs a dial called < em > name< / em > with parent < em > parent< / em > . < em > f< / em > is
propagated to the < a href = "tqwidget.html" > TQWidget< / a > constructor. It has the default range of
a < a href = "tqrangecontrol.html" > TQRangeControl< / a > .
< h3 class = fn > < a name = "TQDial-2" > < / a > TQDial::TQDial ( int minValue, int maxValue, int pageStep, int value, < a href = "tqwidget.html" > TQWidget< / a > * parent = 0, const char * name = 0 )
< / h3 >
Constructs a dial called < em > name< / em > with parent < em > parent< / em > . The dial's
value can never be smaller than < em > minValue< / em > or greater than < em > maxValue< / em > . Its page step size is < em > pageStep< / em > , and its initial value
is < em > value< / em > .
< p > < em > value< / em > is forced to be within the legal range.
< h3 class = fn > < a name = "~TQDial" > < / a > TQDial::~TQDial ()
< / h3 >
Destroys the dial.
< h3 class = fn > void < a name = "addLine" > < / a > TQDial::addLine ()< tt > [slot]< / tt >
< / h3 >
Increments the dial's < a href = "#value" > value< / a > () by one < a href = "#lineStep" > lineStep< / a > ().
< h3 class = fn > void < a name = "addPage" > < / a > TQDial::addPage ()< tt > [slot]< / tt >
< / h3 >
Increments the dial's < a href = "#value" > value< / a > () by one < a href = "#pageStep" > pageStep< / a > () of steps.
< h3 class = fn > void < a name = "dialMoved" > < / a > TQDial::dialMoved ( int value )< tt > [signal]< / tt >
< / h3 >
< p > This signal is emitted whenever the dial < em > value< / em > changes. The
frequency of this signal is < em > not< / em > influenced by < a href = "#setTracking" > setTracking< / a > ().
< p > < p > See also < a href = "#valueChanged" > valueChanged< / a > ().
< h3 class = fn > void < a name = "dialPressed" > < / a > TQDial::dialPressed ()< tt > [signal]< / tt >
< / h3 >
< p > This signal is emitted when the user begins mouse interaction with
the dial.
< p > < p > See also < a href = "#dialReleased" > dialReleased< / a > ().
< h3 class = fn > void < a name = "dialReleased" > < / a > TQDial::dialReleased ()< tt > [signal]< / tt >
< / h3 >
< p > This signal is emitted when the user ends mouse interaction with
the dial.
< p > < p > See also < a href = "#dialPressed" > dialPressed< / a > ().
< h3 class = fn > int < a name = "lineStep" > < / a > TQDial::lineStep () const
< / h3 > < p > Returns the current line step.
See the < a href = "tqdial.html#lineStep-prop" > "lineStep"< / a > property for details.
< h3 class = fn > int < a name = "maxValue" > < / a > TQDial::maxValue () const
< / h3 > < p > Returns the current maximum value.
See the < a href = "tqdial.html#maxValue-prop" > "maxValue"< / a > property for details.
< h3 class = fn > int < a name = "minValue" > < / a > TQDial::minValue () const
< / h3 > < p > Returns the current minimum value.
See the < a href = "tqdial.html#minValue-prop" > "minValue"< / a > property for details.
< h3 class = fn > int < a name = "notchSize" > < / a > TQDial::notchSize () const
< / h3 > < p > Returns the current notch size.
See the < a href = "tqdial.html#notchSize-prop" > "notchSize"< / a > property for details.
< h3 class = fn > double < a name = "notchTarget" > < / a > TQDial::notchTarget () const
< / h3 > < p > Returns the target number of pixels between notches.
See the < a href = "tqdial.html#notchTarget-prop" > "notchTarget"< / a > property for details.
< h3 class = fn > bool < a name = "notchesVisible" > < / a > TQDial::notchesVisible () const
< / h3 > < p > Returns TRUE if the notches are shown; otherwise returns FALSE.
See the < a href = "tqdial.html#notchesVisible-prop" > "notchesVisible"< / a > property for details.
< h3 class = fn > int < a name = "pageStep" > < / a > TQDial::pageStep () const
< / h3 > < p > Returns the current page step.
See the < a href = "tqdial.html#pageStep-prop" > "pageStep"< / a > property for details.
< h3 class = fn > void < a name = "rangeChange" > < / a > TQDial::rangeChange ()< tt > [virtual protected]< / tt >
< / h3 >
Reimplemented to ensure tick-marks are consistent with the new range.
< p > Reimplemented from < a href = "tqrangecontrol.html#rangeChange" > TQRangeControl< / a > .
< h3 class = fn > void < a name = "repaintScreen" > < / a > TQDial::repaintScreen ( const < a href = "tqrect.html" > TQRect< / a > * cr = 0 )< tt > [virtual protected]< / tt >
< / h3 >
Paints the dial using clip region < em > cr< / em > .
< h3 class = fn > void < a name = "setLineStep" > < / a > TQDial::setLineStep ( int )
< / h3 > < p > Sets the current line step.
See the < a href = "tqdial.html#lineStep-prop" > "lineStep"< / a > property for details.
< h3 class = fn > void < a name = "setMaxValue" > < / a > TQDial::setMaxValue ( int )
< / h3 > < p > Sets the current maximum value.
See the < a href = "tqdial.html#maxValue-prop" > "maxValue"< / a > property for details.
< h3 class = fn > void < a name = "setMinValue" > < / a > TQDial::setMinValue ( int )
< / h3 > < p > Sets the current minimum value.
See the < a href = "tqdial.html#minValue-prop" > "minValue"< / a > property for details.
< h3 class = fn > void < a name = "setNotchTarget" > < / a > TQDial::setNotchTarget ( double )< tt > [virtual]< / tt >
< / h3 > < p > Sets the target number of pixels between notches.
See the < a href = "tqdial.html#notchTarget-prop" > "notchTarget"< / a > property for details.
< h3 class = fn > void < a name = "setNotchesVisible" > < / a > TQDial::setNotchesVisible ( bool b )< tt > [virtual slot]< / tt >
< / h3 > < p > Sets whether the notches are shown to < em > b< / em > .
See the < a href = "tqdial.html#notchesVisible-prop" > "notchesVisible"< / a > property for details.
< h3 class = fn > void < a name = "setPageStep" > < / a > TQDial::setPageStep ( int )
< / h3 > < p > Sets the current page step.
See the < a href = "tqdial.html#pageStep-prop" > "pageStep"< / a > property for details.
< h3 class = fn > void < a name = "setTracking" > < / a > TQDial::setTracking ( bool enable )< tt > [virtual slot]< / tt >
< / h3 > < p > Sets whether tracking is enabled to < em > enable< / em > .
See the < a href = "tqdial.html#tracking-prop" > "tracking"< / a > property for details.
< h3 class = fn > void < a name = "setValue" > < / a > TQDial::setValue ( int )< tt > [virtual slot]< / tt >
< / h3 > < p > Sets the current dial value.
See the < a href = "tqdial.html#value-prop" > "value"< / a > property for details.
< h3 class = fn > void < a name = "setWrapping" > < / a > TQDial::setWrapping ( bool on )< tt > [virtual slot]< / tt >
< / h3 > < p > Sets whether wrapping is enabled to < em > on< / em > .
See the < a href = "tqdial.html#wrapping-prop" > "wrapping"< / a > property for details.
< h3 class = fn > void < a name = "subtractLine" > < / a > TQDial::subtractLine ()< tt > [slot]< / tt >
< / h3 >
Decrements the dial's < a href = "#value" > value< / a > () by one < a href = "#lineStep" > lineStep< / a > ().
< h3 class = fn > void < a name = "subtractPage" > < / a > TQDial::subtractPage ()< tt > [slot]< / tt >
< / h3 >
Decrements the dial's < a href = "#value" > value< / a > () by one < a href = "#pageStep" > pageStep< / a > () of steps.
< h3 class = fn > bool < a name = "tracking" > < / a > TQDial::tracking () const
< / h3 > < p > Returns TRUE if tracking is enabled; otherwise returns FALSE.
See the < a href = "tqdial.html#tracking-prop" > "tracking"< / a > property for details.
< h3 class = fn > int < a name = "value" > < / a > TQDial::value () const
< / h3 > < p > Returns the current dial value.
See the < a href = "tqdial.html#value-prop" > "value"< / a > property for details.
< h3 class = fn > void < a name = "valueChange" > < / a > TQDial::valueChange ()< tt > [virtual protected]< / tt >
< / h3 >
Reimplemented to ensure the display is correct and to emit the
< a href = "#valueChanged" > valueChanged< / a > (int) signal when appropriate.
< p > Reimplemented from < a href = "tqrangecontrol.html#valueChange" > TQRangeControl< / a > .
< h3 class = fn > void < a name = "valueChanged" > < / a > TQDial::valueChanged ( int value )< tt > [signal]< / tt >
< / h3 >
< p > This signal is emitted whenever the dial's < em > value< / em > changes. The
frequency of this signal is influenced by < a href = "#setTracking" > setTracking< / a > ().
< h3 class = fn > bool < a name = "wrapping" > < / a > TQDial::wrapping () const
< / h3 > < p > Returns TRUE if wrapping is enabled; otherwise returns FALSE.
See the < a href = "tqdial.html#wrapping-prop" > "wrapping"< / a > property for details.
< hr > < h2 > Property Documentation< / h2 >
< h3 class = fn > int < a name = "lineStep-prop" > < / a > lineStep< / h3 >
< p > This property holds the current line step.
< p > setLineStep() calls the virtual < a href = "tqrangecontrol.html#stepChange" > stepChange< / a > () function if the new
line step is different from the previous setting.
< p > < p > See also < a href = "tqrangecontrol.html#setSteps" > TQRangeControl::setSteps< / a > (), < a href = "#pageStep-prop" > pageStep< / a > , and < a href = "tqrangecontrol.html#setRange" > setRange< / a > ().
< p > Set this property's value with < a href = "#setLineStep" > setLineStep< / a > () and get this property's value with < a href = "#lineStep" > lineStep< / a > ().
< h3 class = fn > int < a name = "maxValue-prop" > < / a > maxValue< / h3 >
< p > This property holds the current maximum value.
< p > When setting this property, the < a href = "#minValue-prop" > TQDial::minValue< / a > is adjusted if
necessary to ensure that the range remains valid.
< p > < p > See also < a href = "tqrangecontrol.html#setRange" > setRange< / a > ().
< p > Set this property's value with < a href = "#setMaxValue" > setMaxValue< / a > () and get this property's value with < a href = "#maxValue" > maxValue< / a > ().
< h3 class = fn > int < a name = "minValue-prop" > < / a > minValue< / h3 >
< p > This property holds the current minimum value.
< p > When setting this property, the < a href = "#maxValue-prop" > TQDial::maxValue< / a > is adjusted if
necessary to ensure that the range remains valid.
< p > < p > See also < a href = "tqrangecontrol.html#setRange" > setRange< / a > ().
< p > Set this property's value with < a href = "#setMinValue" > setMinValue< / a > () and get this property's value with < a href = "#minValue" > minValue< / a > ().
< h3 class = fn > int < a name = "notchSize-prop" > < / a > notchSize< / h3 >
< p > This property holds the current notch size.
< p > The notch size is in range control units, not pixels, and if
possible it is a multiple of < a href = "#lineStep" > lineStep< / a > () that results in an
on-screen notch size near < a href = "#notchTarget" > notchTarget< / a > ().
< p > < p > See also < a href = "#notchTarget-prop" > notchTarget< / a > and < a href = "#lineStep-prop" > lineStep< / a > .
< p > Get this property's value with < a href = "#notchSize" > notchSize< / a > ().
< h3 class = fn > double < a name = "notchTarget-prop" > < / a > notchTarget< / h3 >
< p > This property holds the target number of pixels between notches.
< p > The notch target is the number of pixels TQDial attempts to put
between each notch.
< p > The actual size may differ from the target size.
< p > Set this property's value with < a href = "#setNotchTarget" > setNotchTarget< / a > () and get this property's value with < a href = "#notchTarget" > notchTarget< / a > ().
< h3 class = fn > bool < a name = "notchesVisible-prop" > < / a > notchesVisible< / h3 >
< p > This property holds whether the notches are shown.
< p > If TRUE, the notches are shown. If FALSE (the default) notches are
not shown.
< p > Set this property's value with < a href = "#setNotchesVisible" > setNotchesVisible< / a > () and get this property's value with < a href = "#notchesVisible" > notchesVisible< / a > ().
< h3 class = fn > int < a name = "pageStep-prop" > < / a > pageStep< / h3 >
< p > This property holds the current page step.
< p > setPageStep() calls the virtual < a href = "tqrangecontrol.html#stepChange" > stepChange< / a > () function if the new
page step is different from the previous setting.
< p > < p > See also < a href = "tqrangecontrol.html#stepChange" > stepChange< / a > ().
< p > Set this property's value with < a href = "#setPageStep" > setPageStep< / a > () and get this property's value with < a href = "#pageStep" > pageStep< / a > ().
< h3 class = fn > bool < a name = "tracking-prop" > < / a > tracking< / h3 >
< p > This property holds whether tracking is enabled.
< p > If TRUE (the default), tracking is enabled. This means that the
arrow can be moved using the mouse; otherwise the arrow cannot be
moved with the mouse.
< p > Set this property's value with < a href = "#setTracking" > setTracking< / a > () and get this property's value with < a href = "#tracking" > tracking< / a > ().
< h3 class = fn > int < a name = "value-prop" > < / a > value< / h3 >
< p > This property holds the current dial value.
< p > This is guaranteed to be within the range
< a href = "#minValue-prop" > TQDial::minValue< / a > ..< a href = "#maxValue-prop" > TQDial::maxValue< / a > .
< p > < p > See also < a href = "#minValue-prop" > minValue< / a > and < a href = "#maxValue-prop" > maxValue< / a > .
< p > Set this property's value with < a href = "#setValue" > setValue< / a > () and get this property's value with < a href = "#value" > value< / a > ().
< h3 class = fn > bool < a name = "wrapping-prop" > < / a > wrapping< / h3 >
< p > This property holds whether wrapping is enabled.
< p > If TRUE, wrapping is enabled. This means that the arrow can be
turned around 360<36> . Otherwise there is some space at the bottom of
the dial which is skipped by the arrow.
< p > This property's default is FALSE.
< p > Set this property's value with < a href = "#setWrapping" > setWrapping< / a > () and get this property's value with < a href = "#wrapping" > wrapping< / a > ().
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< td align = right > < div align = right > TQt 3.3.8< / div >
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