Provided by: libqwt-doc_6.0.0-1.2_all 
NAME
QwtSlider -
The Slider Widget.
SYNOPSIS
#include <qwt_slider.h>
Inherits QwtAbstractSlider, and QwtAbstractScale.
Public Types
enum ScalePos { NoScale, LeftScale, RightScale, TopScale, BottomScale }
enum BackgroundStyle { Trough = 0x01, Groove = 0x02 }
typedef QFlags< BackgroundStyle > BackgroundStyles
Public Member Functions
QwtSlider (QWidget *parent, Qt::Orientation=Qt::Horizontal, ScalePos=NoScale, BackgroundStyles=Trough)
virtual void setOrientation (Qt::Orientation)
void setBackgroundStyle (BackgroundStyles)
BackgroundStyles backgroundStyle () const
void setScalePosition (ScalePos s)
ScalePos scalePosition () const
void setHandleSize (int width, int height)
void setHandleSize (const QSize &)
QSize handleSize () const
void setBorderWidth (int bw)
int borderWidth () const
void setSpacing (int)
int spacing () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw (QwtScaleDraw *)
const QwtScaleDraw * scaleDraw () const
Protected Member Functions
virtual double getValue (const QPoint &p)
virtual void getScrollMode (const QPoint &p, QwtAbstractSlider::ScrollMode &, int &direction) const
virtual void drawSlider (QPainter *, const QRect &) const
virtual void drawHandle (QPainter *, const QRect &, int pos) const
virtual void resizeEvent (QResizeEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void changeEvent (QEvent *)
virtual void valueChange ()
virtual void rangeChange ()
virtual void scaleChange ()
int transform (double v) const
QwtScaleDraw * scaleDraw ()
Detailed Description
The Slider Widget.
QwtSlider is a slider widget which operates on an interval of type double. QwtSlider supports different
layouts as well as a scale.
See also:
QwtAbstractSlider and QwtAbstractScale for the descriptions of the inherited members.
Member Typedef Documentation
typedef QFlags<BackgroundStyle> QwtSlider::BackgroundStyles
Background styles.
Member Enumeration Documentation
enum QwtSlider::BackgroundStyle Background style.
See also:
QwtSlider()
Enumerator:
Trough Trough background.
Groove Groove.
enum QwtSlider::ScalePos Scale position. QwtSlider tries to enforce valid combinations of its orientation and
scale position:
• Qt::Horizonal combines with NoScale, TopScale and BottomScale
• Qt::Vertical combines with NoScale, LeftScale and RightScale
See also:
QwtSlider()
Enumerator:
NoScale
The slider has no scale.
LeftScale
The scale is left of the slider.
RightScale
The scale is right of the slider.
TopScale
The scale is above of the slider.
BottomScale
The scale is below of the slider.
Constructor & Destructor Documentation
QwtSlider::QwtSlider (QWidget *parent, Qt::Orientationorientation = Qt::Horizontal, ScalePosscalePos =
NoScale, BackgroundStylesbgStyle = Trough) [explicit]
Constructor. Parameters:
parent parent widget
orientation Orientation of the slider. Can be Qt::Horizontal or Qt::Vertical. Defaults to
Qt::Horizontal.
scalePos Position of the scale. Defaults to QwtSlider::NoScale.
bgStyle Background style. QwtSlider::Trough draws the slider button in a trough, QwtSlider::Slot
draws a slot underneath the button. An or-combination of both may also be used. The default is
QwtSlider::Trough.
QwtSlider enforces valid combinations of its orientation and scale position. If the combination is
invalid, the scale position will be set to NoScale. Valid combinations are:
• Qt::Horizonal with NoScale, TopScale, or BottomScale;
• Qt::Vertical with NoScale, LeftScale, or RightScale.
Member Function Documentation
QwtSlider::BackgroundStyles QwtSlider::backgroundStyle () const Returns:
the background style.
int QwtSlider::borderWidth () const Returns:
the border width.
See also:
setBorderWidth()
void QwtSlider::changeEvent (QEvent *event) [protected, virtual]
Qt change event handler.
void QwtSlider::drawHandle (QPainter *painter, const QRect &sliderRect, intpos) const [protected, virtual]
Draw the thumb at a position
Parameters:
painter Painter
sliderRect Bounding rectangle of the slider
pos Position of the slider thumb
void QwtSlider::drawSlider (QPainter *painter, const QRect &sliderRect) const [protected, virtual] Draw the
slider into the specified rectangle.
Parameters:
painter Painter
sliderRect Bounding rectangle of the slider
void QwtSlider::getScrollMode (const QPoint &p, QwtAbstractSlider::ScrollMode &scrollMode, int &direction)
const [protected, virtual]
Determine scrolling mode and direction. Parameters:
p point
scrollMode Scrolling mode
direction Direction
Implements QwtAbstractSlider.
double QwtSlider::getValue (const QPoint &pos) [protected, virtual] Determine the value corresponding to a
specified mouse location.
Parameters:
pos Mouse position
Implements QwtAbstractSlider.
QSize QwtSlider::handleSize () const Returns:
Size of the handle.
See also:
setHandleSize()
QSize QwtSlider::minimumSizeHint () const [virtual]
Return a minimum size hint. Warning:
The return value of QwtSlider::minimumSizeHint() depends on the font and the scale.
void QwtSlider::paintEvent (QPaintEvent *event) [protected, virtual] Qt paint event
Parameters:
event Paint event
void QwtSlider::rangeChange () [protected, virtual]
Notify change of range.
Reimplemented from QwtDoubleRange.
void QwtSlider::resizeEvent (QResizeEvent *) [protected, virtual]
Qt resize event.
void QwtSlider::scaleChange () [protected, virtual]
Notify changed scale.
Reimplemented from QwtAbstractScale.
const QwtScaleDraw * QwtSlider::scaleDraw () const Returns:
the scale draw of the slider
See also:
setScaleDraw()
QwtScaleDraw * QwtSlider::scaleDraw () [protected] Returns:
the scale draw of the slider
See also:
setScaleDraw()
QwtSlider::ScalePos QwtSlider::scalePosition () const
Return the scale position.
void QwtSlider::setBackgroundStyle (BackgroundStylesstyle) Set the background style.
void QwtSlider::setBorderWidth (intwidth)
Change the slider's border width. Parameters:
width Border width
void QwtSlider::setHandleSize (const QSize &size)
Set the slider's handle size. Parameters:
size New size
See also:
handleSize()
void QwtSlider::setHandleSize (intwidth, intheight)
Set the slider's handle size. Parameters:
width Width
height Height
See also:
handleSize()
void QwtSlider::setOrientation (Qt::Orientationo) [virtual]
Set the orientation. Parameters:
o Orientation. Allowed values are Qt::Horizontal and Qt::Vertical.
If the new orientation and the old scale position are an invalid combination, the scale position will be
set to QwtSlider::NoScale.
See also:
QwtAbstractSlider::orientation()
Reimplemented from QwtAbstractSlider.
void QwtSlider::setScaleDraw (QwtScaleDraw *scaleDraw)
Set a scale draw. For changing the labels of the scales, it is necessary to derive from QwtScaleDraw and
overload QwtScaleDraw::label().
Parameters:
scaleDraw ScaleDraw object, that has to be created with new and will be deleted in ~QwtSlider or the
next call of setScaleDraw().
See also:
scaleDraw()
void QwtSlider::setScalePosition (ScalePosscalePos)
Change the scale position (and slider orientation). Parameters:
scalePos Position of the scale.
A valid combination of scale position and orientation is enforced:
• if the new scale position is Left or Right, the scale orientation will become Qt::Vertical;
• if the new scale position is Bottom or Top the scale orientation will become Qt::Horizontal;
• if the new scale position is QwtSlider::NoScale, the scale orientation will not change.
void QwtSlider::setSpacing (intspacing)
Change the spacing between pipe and scale. A spacing of 0 means, that the backbone of the scale is below
the trough.
The default setting is 4 pixels.
Parameters:
spacing Number of pixels
See also:
spacing();
QSize QwtSlider::sizeHint () const [virtual] Returns:
QwtSlider::minimumSizeHint()
int QwtSlider::spacing () const Returns:
Number of pixels between slider and scale
See also:
setSpacing()
int QwtSlider::transform (doublevalue) const [protected] Map and round a value into widget coordinates
Parameters:
value Value
void QwtSlider::valueChange () [protected, virtual]
Notify change of value.
Reimplemented from QwtAbstractSlider.
Author
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