| Qwt User's Guide
    6.1.3
    | 
The Slider Widget. More...
#include <qwt_slider.h>

| 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.  More... | |
| Qt::Orientation | orientation () const | 
| void | setScalePosition (ScalePosition) | 
| Change the position of the scale.  More... | |
| 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.  More... | |
| QSize | handleSize () const | 
| void | setBorderWidth (int bw) | 
| Change the slider's border width.  More... | |
| int | borderWidth () const | 
| void | setSpacing (int) | 
| Change the spacing between trough and scale.  More... | |
| int | spacing () const | 
| virtual QSize | sizeHint () const | 
| virtual QSize | minimumSizeHint () const | 
| void | setScaleDraw (QwtScaleDraw *) | 
| Set a scale draw.  More... | |
| const QwtScaleDraw * | scaleDraw () const | 
| void | setUpdateInterval (int) | 
| Specify the update interval for automatic scrolling.  More... | |
| int | updateInterval () const | 
|  Public Member Functions inherited from QwtAbstractSlider | |
| QwtAbstractSlider (QWidget *parent=NULL) | |
| Constructor.  More... | |
| virtual | ~QwtAbstractSlider () | 
| Destructor. | |
| void | setValid (bool) | 
| bool | isValid () const | 
| double | value () const | 
| Returns the current value. | |
| void | setWrapping (bool) | 
| bool | wrapping () const | 
| void | setTotalSteps (uint) | 
| Set the number of steps.  More... | |
| uint | totalSteps () const | 
| void | setSingleSteps (uint) | 
| Set the number of steps for a single increment.  More... | |
| uint | singleSteps () const | 
| void | setPageSteps (uint) | 
| Set the number of steps for a page increment.  More... | |
| uint | pageSteps () const | 
| void | setStepAlignment (bool) | 
| Enable step alignment.  More... | |
| bool | stepAlignment () const | 
| void | setTracking (bool) | 
| Enables or disables tracking.  More... | |
| bool | isTracking () const | 
| void | setReadOnly (bool) | 
| bool | isReadOnly () const | 
| void | setInvertedControls (bool) | 
| bool | invertedControls () const | 
|  Public Member Functions inherited from QwtAbstractScale | |
| QwtAbstractScale (QWidget *parent=NULL) | |
| virtual | ~QwtAbstractScale () | 
| Destructor. | |
| void | setScale (double lowerBound, double upperBound) | 
| Specify a scale.  More... | |
| void | setScale (const QwtInterval &) | 
| Specify a scale.  More... | |
| void | setScale (const QwtScaleDiv &) | 
| Specify a scale.  More... | |
| const QwtScaleDiv & | scaleDiv () const | 
| void | setLowerBound (double value) | 
| double | lowerBound () const | 
| void | setUpperBound (double value) | 
| double | upperBound () const | 
| void | setScaleStepSize (double stepSize) | 
| Set the step size used for calculating a scale division.  More... | |
| double | scaleStepSize () const | 
| void | setScaleMaxMajor (int ticks) | 
| Set the maximum number of major tick intervals.  More... | |
| int | scaleMaxMinor () const | 
| void | setScaleMaxMinor (int ticks) | 
| Set the maximum number of minor tick intervals.  More... | |
| int | scaleMaxMajor () const | 
| void | setScaleEngine (QwtScaleEngine *) | 
| Set a scale engine.  More... | |
| const QwtScaleEngine * | scaleEngine () const | 
| QwtScaleEngine * | scaleEngine () | 
| int | transform (double) const | 
| double | invTransform (int) const | 
| bool | isInverted () const | 
| double | minimum () const | 
| double | maximum () const | 
| const QwtScaleMap & | scaleMap () const | 
| Protected Member Functions | |
| virtual double | scrolledTo (const QPoint &) const | 
| Determine the value for a new position of the slider handle.  More... | |
| virtual bool | isScrollPosition (const QPoint &) const | 
| Determine what to do when the user presses a mouse button.  More... | |
| 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 | 
|  Protected Member Functions inherited from QwtAbstractSlider | |
| virtual void | mouseMoveEvent (QMouseEvent *) | 
| virtual void | keyPressEvent (QKeyEvent *) | 
| virtual void | wheelEvent (QWheelEvent *) | 
| void | incrementValue (int numSteps) | 
| virtual void | sliderChange () | 
| Calling update() | |
| double | incrementedValue (double value, int stepCount) const | 
|  Protected Member Functions inherited from QwtAbstractScale | |
| void | rescale (double lowerBound, double upperBound, double stepSize) | 
| void | setAbstractScaleDraw (QwtAbstractScaleDraw *) | 
| Set a scale draw.  More... | |
| const QwtAbstractScaleDraw * | abstractScaleDraw () const | 
| QwtAbstractScaleDraw * | abstractScaleDraw () | 
| Additional Inherited Members | |
|  Public Slots inherited from QwtAbstractSlider | |
| void | setValue (double val) | 
|  Signals inherited from QwtAbstractSlider | |
| void | valueChanged (double value) | 
| Notify a change of value.  More... | |
| void | sliderPressed () | 
| void | sliderReleased () | 
| void | sliderMoved (double value) | 
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
| 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. | 
| 
 | 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.
| parent | Parent widget | 
| 
 | 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.
| parent | Parent widget | 
| orientation | Orientation of the slider. | 
| int QwtSlider::borderWidth | ( | ) | const | 
| 
 | protectedvirtual | 
Handles QEvent::StyleChange and QEvent::FontChange events
| event | Change event | 
| 
 | protectedvirtual | 
Draw the thumb at a position
| painter | Painter | 
| handleRect | Bounding rectangle of the handle | 
| pos | Position of the handle marker in widget coordinates | 
| 
 | protectedvirtual | 
Draw the slider into the specified rectangle.
| painter | Painter | 
| sliderRect | Bounding rectangle of the slider | 
| 
 | protected | 
| QSize QwtSlider::handleSize | ( | ) | const | 
| bool QwtSlider::hasGroove | ( | ) | const | 
| bool QwtSlider::hasTrough | ( | ) | const | 
| 
 | protectedvirtual | 
Determine what to do when the user presses a mouse button.
| pos | Mouse position | 
| True,when | handleRect() contains pos | 
Implements QwtAbstractSlider.
| 
 | virtual | 
| 
 | protectedvirtual | 
| 
 | protectedvirtual | 
| Qt::Orientation QwtSlider::orientation | ( | ) | const | 
| 
 | protectedvirtual | 
Qt paint event handler
| event | Paint event | 
| 
 | protectedvirtual | 
Qt resize event handler
| event | Resize event | 
| const QwtScaleDraw * QwtSlider::scaleDraw | ( | ) | const | 
| QwtSlider::ScalePosition QwtSlider::scalePosition | ( | ) | const | 
| 
 | protectedvirtual | 
Determine the value for a new position of the slider handle.
| pos | Mouse position | 
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.
| width | Border width | 
| void QwtSlider::setGroove | ( | bool | on | ) | 
En/Disable the groove
The slider can be cutomized by showing a groove for the handle.
| on | When true, the groove is visible | 
| 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().
| size | New size | 
| void QwtSlider::setOrientation | ( | Qt::Orientation | orientation | ) | 
Set the orientation.
| orientation | Allowed values are Qt::Horizontal and Qt::Vertical. | 
| 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().
| 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 | ( | ScalePosition | scalePosition | ) | 
Change the position of the scale.
| scalePosition | Position of the scale. | 
| 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.
| spacing | Number of pixels | 
| void QwtSlider::setTrough | ( | bool | on | ) | 
En/Disable the trough
The slider can be cutomized by showing a trough for the handle.
| on | When true, the groove is visible | 
| void QwtSlider::setUpdateInterval | ( | int | interval | ) | 
Specify the update interval for automatic scrolling.
The minimal accepted value is 50 ms.
| interval | Update interval in milliseconds | 
| 
 | virtual | 
| 
 | protected | 
| int QwtSlider::spacing | ( | ) | const | 
| 
 | protectedvirtual | 
Timer event handler
Handles the timer, when the mouse stays pressed inside the sliderRect().
| event | Mouse event | 
| int QwtSlider::updateInterval | ( | ) | const |