QwtSlider(3)

NAME
QwtSlider -

The Slider Widget.

SYNOPSIS

#include <qwt_slider.h>

Inherits QwtAbstractSlider, and QwtAbstractScale.

  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.

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

Author

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