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QwtSlider

NAME

QwtSlider -

SYNOPSIS

Inherits QwtAbstractSlider, and QwtAbstractScale.

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.

Definition at line 34 of file qwt_slider.h.

Public Types

enum ScalePos { NoScale, LeftScale, RightScale, TopScale, BottomScale, 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 ~QwtSlider ()

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 ()

Member Enumeration Documentation

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::QwtSlider

Definition at line 56 of file qwt_slider.h.

enum QwtSlider::BGSTYLE

Background style.

See also:

QwtSlider::QwtSlider

Definition at line 70 of file qwt_slider.h.

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.

Definition at line 64 of file qwt_slider.cpp.

Member Function Documentation

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.

Definition at line 174 of file qwt_slider.cpp.

References layoutSlider(), QwtAbstractSlider::orientation(), and QwtAbstractSlider::setOrientation().

Referenced by setScalePosition().

void QwtSlider::setBgStyle (BGSTYLE st)

Set the background style.

Definition at line 784 of file qwt_slider.cpp.

References layoutSlider().

QwtSlider::BGSTYLE QwtSlider::bgStyle () const

Returns:

the background style.

Definition at line 793 of file qwt_slider.cpp.

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.

Definition at line 224 of file qwt_slider.cpp.

References layoutSlider(), scaleDraw(), QwtScaleDraw::setAlignment(), and setOrientation().

QwtSlider::ScalePos QwtSlider::scalePosition () const

Return the scale position.

Definition at line 267 of file qwt_slider.cpp.

int QwtSlider::thumbLength () const

Returns:

the thumb length.

Definition at line 801 of file qwt_slider.cpp.

Referenced by getScrollMode().

int QwtSlider::thumbWidth () const

Returns:

the thumb width.

Definition at line 809 of file qwt_slider.cpp.

int QwtSlider::borderWidth () const

Returns:

the border width.

Definition at line 817 of file qwt_slider.cpp.

void QwtSlider::setThumbLength (int thumbLength)

Set the slider's thumb length.

Parameters:

thumbLength new length

Definition at line 292 of file qwt_slider.cpp.

References layoutSlider().

void QwtSlider::setThumbWidth (int w)

Change the width of the thumb.

Parameters:

w new width

Definition at line 308 of file qwt_slider.cpp.

References layoutSlider().

void QwtSlider::setBorderWidth (int bd)

Change the slider's border width.

Parameters:

bd border width

Definition at line 276 of file qwt_slider.cpp.

References layoutSlider().

void QwtSlider::setMargins (int xMargin, int yMargin)

Set distances between the widget's border and internals.

Parameters:

xMargin Horizontal margin
yMargin Vertical margin

Definition at line 766 of file qwt_slider.cpp.

References layoutSlider().

QSize QwtSlider::sizeHint () const [virtual]

Returns:

QwtSlider::minimumSizeHint()

Definition at line 825 of file qwt_slider.cpp.

References minimumSizeHint().

QSize QwtSlider::minimumSizeHint () const [virtual]

Return a minimum size hint.

Warning:

The return value of QwtSlider::minimumSizeHint() depends on the font and the scale.

Definition at line 835 of file qwt_slider.cpp.

References QwtScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::minLength(), QwtAbstractSlider::orientation(), and scaleDraw().

Referenced by sizeHint().

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().

Definition at line 331 of file qwt_slider.cpp.

References QwtScaleDraw::alignment(), layoutSlider(), scaleDraw(), QwtAbstractScale::setAbstractScaleDraw(), and QwtScaleDraw::setAlignment().

const QwtScaleDraw * QwtSlider::scaleDraw () const

Returns:

the scale draw of the slider

See also:

setScaleDraw()

Definition at line 348 of file qwt_slider.cpp.

References QwtAbstractScale::abstractScaleDraw().

Referenced by draw(), getScrollMode(), layoutSlider(), minimumSizeHint(), setScaleDraw(), and setScalePosition().

double QwtSlider::getValue (const QPoint & p) [protected, virtual]

Determine the value corresponding to a specified mouse location.

Implements QwtAbstractSlider.

Definition at line 517 of file qwt_slider.cpp.

References QwtAbstractSlider::orientation().

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.

Definition at line 530 of file qwt_slider.cpp.

References QwtAbstractSlider::orientation(), scaleDraw(), thumbLength(), QwtDoubleRange::value(), and xyPosition().

void QwtSlider::draw (QPainter * p, const QRect & update_rect) [protected]

Draw the QwtSlider.

Definition at line 575 of file qwt_slider.cpp.

References QwtAbstractScaleDraw::draw(), QwtPainter::drawFocusRect(), drawSlider(), and scaleDraw().

Referenced by paintEvent().

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

Draw the slider into the specified rectangle.

Definition at line 377 of file qwt_slider.cpp.

References drawThumb(), QwtAbstractSlider::isValid(), QwtAbstractSlider::orientation(), QwtDoubleRange::value(), and xyPosition().

Referenced by draw().

void QwtSlider::drawThumb (QPainter * p, const QRect &, int pos) [protected, virtual]

Draw the thumb at a position.

Definition at line 453 of file qwt_slider.cpp.

References QwtAbstractSlider::orientation().

Referenced by drawSlider().

void QwtSlider::resizeEvent (QResizeEvent * e) [protected, virtual]

Qt resize event.

Definition at line 593 of file qwt_slider.cpp.

References layoutSlider().

void QwtSlider::paintEvent (QPaintEvent * e) [protected, virtual]

Qt paint event.

Definition at line 559 of file qwt_slider.cpp.

References draw().

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

Notify change of value.

Reimplemented from QwtAbstractSlider.

Definition at line 742 of file qwt_slider.cpp.

References QwtAbstractSlider::valueChange().

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

Notify change of range.

Reimplemented from QwtDoubleRange.

Definition at line 750 of file qwt_slider.cpp.

References QwtAbstractScale::autoScale(), layoutSlider(), QwtDoubleRange::maxValue(), QwtDoubleRange::minValue(), QwtDoubleRange::rangeChange(), and QwtAbstractScale::rescale().

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

Notify changed scale.

Reimplemented from QwtAbstractScale.

Definition at line 363 of file qwt_slider.cpp.

References layoutSlider().

void QwtSlider::fontChange (const QFont & oldFont) [protected, virtual]

Notify change in font.

Definition at line 370 of file qwt_slider.cpp.

References layoutSlider().

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

Definition at line 604 of file qwt_slider.cpp.

References QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::move(), QwtAbstractSlider::orientation(), scaleDraw(), and QwtScaleDraw::setLength().

Referenced by fontChange(), rangeChange(), resizeEvent(), scaleChange(), setBgStyle(), setBorderWidth(), setMargins(), setOrientation(), setScaleDraw(), setScalePosition(), setThumbLength(), and setThumbWidth().

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

Find the x/y position for a given value v.

Definition at line 511 of file qwt_slider.cpp.

Referenced by drawSlider(), and getScrollMode().

QwtScaleDraw * QwtSlider::scaleDraw () [protected]

Returns:

the scale draw of the slider

See also:

setScaleDraw()

Definition at line 357 of file qwt_slider.cpp.

References QwtAbstractScale::abstractScaleDraw().

Author

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