QwtSlider(3)

NAME
QwtSlider - The Slider Widget.

SYNOPSIS

#include <qwt_slider.h>

Inherits QwtAbstractSlider.

  Public Types
enum ScalePosition { NoScale, LeadingScale, TrailingScale }

  Public Member Functions
QwtSlider (QWidget *parent=NULL)
QwtSlider (Qt::Orientation, QWidget *parent=NULL)
virtual ~QwtSlider ()
Destructor.
void setOrientation (Qt::Orientation)
Set the orientation.
Qt::Orientation orientation () const
void setScalePosition (ScalePosition)
Change the position of the scale.
ScalePosition scalePosition () const
void setTrough (bool)
bool hasTrough () const
void setGroove (bool)
bool hasGroove () const
void setHandleSize (const QSize &)
Set the slider's handle size.
QSize handleSize () const
void setBorderWidth (int)
Change the slider's border width.
int borderWidth () const
void setSpacing (int)
Change the spacing between trough and scale.
int spacing () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw (QwtScaleDraw *)
Set a scale draw.
const QwtScaleDraw * scaleDraw () const
void setUpdateInterval (int)
Specify the update interval for automatic scrolling.
int updateInterval () const

  Protected Member Functions
virtual double scrolledTo (const QPoint &) const
Determine the value for a new position of the slider handle.
virtual bool isScrollPosition (const QPoint &) const
Determine what to do when the user presses a mouse button.
virtual void drawSlider (QPainter *, const QRect &) const
virtual void drawHandle (QPainter *, const QRect &, int pos) const
virtual void mousePressEvent (QMouseEvent *)
virtual void mouseReleaseEvent (QMouseEvent *)
virtual void resizeEvent (QResizeEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void changeEvent (QEvent *)
virtual void timerEvent (QTimerEvent *)
virtual void scaleChange ()
Notify changed scale.
QRect sliderRect () const
QRect handleRect () const

  Additional Inherited Members

Detailed Description

The Slider Widget. QwtSlider is a slider widget which operates on an interval of type double. Its position is related to a scale showing the current value.

The slider can be customized by having a through, a groove - or both.

Member Enumeration Documentation

  enum QwtSlider::ScalePosition
Position of the scale

See also
    QwtSlider(), setScalePosition(), setOrientation()

Enumerator

NoScale
    The slider has no scale.

LeadingScale
    The scale is right of a vertical or below a horizontal slider.

TrailingScale
    The scale is left of a vertical or above a horizontal slider.

Constructor & Destructor Documentation

  QwtSlider::QwtSlider (QWidget * parent = NULL) [explicit]
Construct vertical slider in QwtSlider::Trough style with a scale to the left.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters
    parent Parent widget

See also
    setOrientation(), setScalePosition(), setBackgroundStyle()

  QwtSlider::QwtSlider (Qt::Orientation orientation, QWidget * parent = NULL) [explicit]
Construct a slider in QwtSlider::Trough style

When orientation is Qt::Vertical the scale will be aligned to the left - otherwise at the the top of the slider.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters
    parent Parent widget
    orientation Orientation of the slider.

Member Function Documentation

  int QwtSlider::borderWidth () const

Returns
    the border width.

See also
    setBorderWidth()

  void QwtSlider::changeEvent (QEvent * event) [protected], [virtual]
Handles QEvent::StyleChange and QEvent::FontChange events

Parameters
    event Change event

  void QwtSlider::drawHandle (QPainter * painter, const QRect & handleRect, int pos) const [protected], [virtual]
Draw the thumb at a position

Parameters
    painter Painter
    handleRect Bounding rectangle of the handle
    pos Position of the handle marker in widget coordinates

  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

  QRect QwtSlider::handleRect () const [protected]

Returns
    Bounding rectangle of the slider handle

  QSize QwtSlider::handleSize () const

Returns
    Size of the handle.

See also
    setHandleSize()

  bool QwtSlider::hasGroove () const

Returns
    True, when the groove is visisble

See also
    setGroove(), hasTrough()

  bool QwtSlider::hasTrough () const

Returns
    True, when the trough is visisble

See also
    setTrough(), hasGroove()

  bool QwtSlider::isScrollPosition (const QPoint & pos) const [protected], [virtual]

Determine what to do when the user presses a mouse button.

Parameters
    pos Mouse position

Return values
    True,when handleRect() contains pos

See also
    scrolledTo()

Implements QwtAbstractSlider.

  QSize QwtSlider::minimumSizeHint () const [virtual]

Returns
    Minimum size hint

See also
    sizeHint()

  void QwtSlider::mousePressEvent (QMouseEvent * event) [protected], [virtual]
Mouse press event handler

Parameters
    event Mouse event

Reimplemented from QwtAbstractSlider.

  void QwtSlider::mouseReleaseEvent (QMouseEvent * event) [protected], [virtual]
Mouse release event handler

Parameters
    event Mouse event

Reimplemented from QwtAbstractSlider.

  Qt::Orientation QwtSlider::orientation () const

Returns
    Orientation

See also
    setOrientation()

  void QwtSlider::paintEvent (QPaintEvent * event) [protected], [virtual]
Qt paint event handler

Parameters
    event Paint event

  void QwtSlider::resizeEvent (QResizeEvent * event) [protected], [virtual]
Qt resize event handler

Parameters
    event Resize event

  const QwtScaleDraw * QwtSlider::scaleDraw () const

Returns
    the scale draw of the slider

See also
    setScaleDraw()

  QwtSlider::ScalePosition QwtSlider::scalePosition () const

Returns
    Position of the scale

See also
    setScalePosition()

  double QwtSlider::scrolledTo (const QPoint & pos) const [protected], [virtual]

Determine the value for a new position of the slider handle.

Parameters
    pos Mouse position

Returns
    Value for the mouse position

See also
    isScrollPosition()

Implements QwtAbstractSlider.

  void QwtSlider::setBorderWidth (int width)

Change the slider's border width. The border width is used for drawing the slider handle and the trough.

Parameters
    width Border width

See also
    borderWidth()

  void QwtSlider::setGroove (bool on)
En/Disable the groove

The slider can be cutomized by showing a groove for the handle.

Parameters
    on When true, the groove is visible

See also
    hasGroove(), setThrough()

  void QwtSlider::setHandleSize (const QSize & size)

Set the slider's handle size. When the size is empty the slider handle will be painted with a default size depending on its orientation() and backgroundStyle().

Parameters
    size New size

See also
    handleSize()

  void QwtSlider::setOrientation (Qt::Orientation orientation)

Set the orientation.

Parameters
    orientation Allowed values are Qt::Horizontal and Qt::Vertical.

See also
    orientation(), scalePosition()

  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 (ScalePosition scalePosition)

Change the position of the scale.

Parameters
    scalePosition Position of the scale.

See also
    ScalePosition, scalePosition()

  void QwtSlider::setSpacing (int spacing)

Change the spacing between trough and scale. A spacing of 0 means, that the backbone of the scale is covered by the trough.

The default setting is 4 pixels.

Parameters
    spacing Number of pixels

See also
    spacing();

  void QwtSlider::setTrough (bool on)
En/Disable the trough

The slider can be cutomized by showing a trough for the handle.

Parameters
    on When true, the groove is visible

See also
    hasTrough(), setGroove()

  void QwtSlider::setUpdateInterval (int interval)

Specify the update interval for automatic scrolling. The minimal accepted value is 50 ms.

Parameters
    interval Update interval in milliseconds

See also
    setUpdateInterval()

  QSize QwtSlider::sizeHint () const [virtual]

Returns
    minimumSizeHint()

  QRect QwtSlider::sliderRect () const [protected]

Returns
    Bounding rectangle of the slider - without the scale

  int QwtSlider::spacing () const

Returns
    Number of pixels between slider and scale

See also
    setSpacing()

  void QwtSlider::timerEvent (QTimerEvent * event) [protected], [virtual]
Timer event handler

Handles the timer, when the mouse stays pressed inside the sliderRect().

Parameters
    event Mouse event

  int QwtSlider::updateInterval () const

Returns
    Update interval in milliseconds for automatic scrolling

See also
    setUpdateInterval()

Author

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