QwtSlider(3) Qwt User's Guide QwtSlider(3)

QwtSlider - The Slider Widget.

#include <qwt_slider.h>

Inherits QwtAbstractSlider.


enum ScalePosition { NoScale, LeadingScale, TrailingScale }


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


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

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.

Position of the scale

See also:

QwtSlider(), setScalePosition(), setOrientation()

Enumerator

The slider has no scale.
The scale is right of a vertical or below a horizontal slider.
The scale is left of a vertical or above a horizontal slider.

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()

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.

Returns:

the border width.

See also:

setBorderWidth()

Handles QEvent::StyleChange and QEvent::FontChange events

Parameters:

event Change event

Draw the thumb at a position

Parameters:

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

Draw the slider into the specified rectangle.

Parameters:

painter Painter
sliderRect Bounding rectangle of the slider

Returns:

Bounding rectangle of the slider handle

Returns:

Size of the handle.

See also:

setHandleSize()

Returns:

True, when the groove is visisble

See also:

setGroove(), hasTrough()

Returns:

True, when the trough is visisble

See also:

setTrough(), hasGroove()

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.

Returns:

Minimum size hint

See also:

sizeHint()

Mouse press event handler

Parameters:

event Mouse event

Reimplemented from QwtAbstractSlider.

Mouse release event handler

Parameters:

event Mouse event

Reimplemented from QwtAbstractSlider.

Returns:

Orientation

See also:

setOrientation()

Qt paint event handler

Parameters:

event Paint event

Qt resize event handler

Parameters:

event Resize event

Returns:

the scale draw of the slider

See also:

setScaleDraw()

QwtSlider::ScalePosition QwtSlider::scalePosition () const

Returns:

Position of the scale

See also:

setScalePosition()

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.

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()

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()

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()

Set the orientation.

Parameters:

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

See also:

orientation(), scalePosition()

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()

Change the position of the scale.

Parameters:

scalePosition Position of the scale.

See also:

ScalePosition, scalePosition()

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();

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()

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

Parameters:

interval Update interval in milliseconds

See also:

setUpdateInterval()

Returns:

minimumSizeHint()

Returns:

Bounding rectangle of the slider - without the scale

Returns:

Number of pixels between slider and scale

See also:

setSpacing()

Timer event handler

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

Parameters:

event Mouse event

Returns:

Update interval in milliseconds for automatic scrolling

See also:

setUpdateInterval()

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Wed Jan 2 2019 Version 6.1.4