Qwt User's Guide: QwtSlider Class Reference

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QwtSlider Class Reference

The Slider Widget. More...

#include <qwt_slider.h>

Inheritance diagram for QwtSlider:
[legend]

List of all members.

Public Types

enum  ScalePos {
  NoScale,
  LeftScale,
  RightScale,
  TopScale,
  BottomScale
}
enum  BGSTYLE {
  BgTrough = 0x1,
  BgSlot = 0x2,
  BgBoth = BgTrough | BgSlot
}

Public Member Functions

 QwtSlider (QWidget *parent, Qt::Orientation=Qt::Horizontal, ScalePos=NoScale, BGSTYLE bgStyle=BgTrough)
virtual void setOrientation (Qt::Orientation)
void setBgStyle (BGSTYLE)
BGSTYLE bgStyle () const
void setScalePosition (ScalePos s)
ScalePos scalePosition () const
int thumbLength () const
int thumbWidth () const
int borderWidth () const
void setThumbLength (int l)
void setThumbWidth (int w)
void setBorderWidth (int bw)
void setMargins (int x, int y)
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, int &scrollMode, int &direction)
void draw (QPainter *p, const QRect &update_rect)
virtual void drawSlider (QPainter *p, const QRect &r)
virtual void drawThumb (QPainter *p, const QRect &, int pos)
virtual void resizeEvent (QResizeEvent *e)
virtual void paintEvent (QPaintEvent *e)
virtual void valueChange ()
virtual void rangeChange ()
virtual void scaleChange ()
virtual void fontChange (const QFont &oldFont)
void layoutSlider (bool update=true)
int xyPosition (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.

sliders.png
See also:
QwtAbstractSlider and QwtAbstractScale for the descriptions of the inherited members.

Member Enumeration Documentation

enum QwtSlider::BGSTYLE

Background style.

See also:
QwtSlider()
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()

Constructor & Destructor Documentation

QwtSlider::QwtSlider ( QWidget *  parent,
Qt::Orientation  orientation = Qt::Horizontal,
ScalePos  scalePos = NoScale,
BGSTYLE  bgStyle = BgTrough 
) [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::BgTrough draws the slider button in a trough, QwtSlider::BgSlot draws a slot underneath the button. An or-combination of both may also be used. The default is QwtSlider::BgTrough.

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::BGSTYLE QwtSlider::bgStyle (  )  const
Returns:
the background style.
int QwtSlider::borderWidth (  )  const
Returns:
the border width.
void QwtSlider::draw ( QPainter *  p,
const QRect &  update_rect 
) [protected]

Draw the QwtSlider.

void QwtSlider::drawSlider ( QPainter *  painter,
const QRect &  r 
) [protected, virtual]

Draw the slider into the specified rectangle.

Parameters:
painter Painter
r Rectangle
void QwtSlider::drawThumb ( QPainter *  painter,
const QRect &  sliderRect,
int  pos 
) [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::fontChange ( const QFont &  oldFont  )  [protected, virtual]

Notify change in font.

void QwtSlider::getScrollMode ( const QPoint &  p,
int &  scrollMode,
int &  direction 
) [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.

void QwtSlider::layoutSlider ( bool  update_geometry = true  )  [protected]

Recalculate the slider's geometry and layout based on the current rect and fonts.

Parameters:
update_geometry notify the layout system and call update to redraw the scale
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 *  e  )  [protected, virtual]

Qt resize event.

void QwtSlider::scaleChange (  )  [protected, virtual]

Notify changed scale.

Reimplemented from QwtAbstractScale.

QwtScaleDraw * QwtSlider::scaleDraw (  )  [protected]
Returns:
the scale draw of the slider
See also:
setScaleDraw()
const QwtScaleDraw * QwtSlider::scaleDraw (  )  const
Returns:
the scale draw of the slider
See also:
setScaleDraw()
QwtSlider::ScalePos QwtSlider::scalePosition (  )  const

Return the scale position.

void QwtSlider::setBgStyle ( BGSTYLE  st  ) 

Set the background style.

void QwtSlider::setBorderWidth ( int  bd  ) 

Change the slider's border width.

Parameters:
bd border width
void QwtSlider::setMargins ( int  xMargin,
int  yMargin 
)

Set distances between the widget's border and internals.

Parameters:
xMargin Horizontal margin
yMargin Vertical margin
void QwtSlider::setOrientation ( Qt::Orientation  o  )  [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().
void QwtSlider::setScalePosition ( ScalePos  s  ) 

Change the scale position (and slider orientation).

Parameters:
s 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::setThumbLength ( int  thumbLength  ) 

Set the slider's thumb length.

Parameters:
thumbLength new length
void QwtSlider::setThumbWidth ( int  w  ) 

Change the width of the thumb.

Parameters:
w new width
QSize QwtSlider::sizeHint (  )  const [virtual]
Returns:
QwtSlider::minimumSizeHint()
int QwtSlider::thumbLength (  )  const
Returns:
the thumb length.
int QwtSlider::thumbWidth (  )  const
Returns:
the thumb width.
void QwtSlider::valueChange (  )  [protected, virtual]

Notify change of value.

Reimplemented from QwtAbstractSlider.

int QwtSlider::xyPosition ( double  value  )  const [protected]

Find the x/y position for a given value v

Parameters:
value Value
Generated on Wed Sep 2 18:37:27 2009 for Qwt User's Guide by  doxygen 1.6.1
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