conflicting packages
QwtAbstractSlider(3) | Qwt User's Guide | QwtAbstractSlider(3) |
NAME¶
QwtAbstractSlider - An abstract base class for slider widgets.SYNOPSIS¶
#include <qwt_abstract_slider.h> Inherits QwtDoubleRange. Inherited by QwtDial, QwtKnob, QwtSlider, and QwtWheel.Public Types¶
enum ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage }
Public Slots¶
virtual void fitValue (double val)
Signals¶
void sliderMoved (double value)
Public Member Functions¶
virtual void incPages (int)
Protected Member Functions¶
double exactPrevValue () const
Detailed Description¶
An abstract base class for slider widgets.Member Enumeration Documentation¶
enum QwtAbstractSlider::ScrollMode Scroll mode¶
See also:getScrollMode()
Constructor & Destructor Documentation¶
QwtAbstractSlider::QwtAbstractSlider (Qt::Orientationorientation, QWidget *parent = NULL) [explicit]¶
Constructor. Parameters:orientation Orientation
parent Parent widget
QwtAbstractSlider::~QwtAbstractSlider () [virtual]¶
Destructor.Member Function Documentation¶
double QwtDoubleRange::exactPrevValue () const [protected, inherited]¶
Returns the exact previous value.double QwtDoubleRange::exactValue () const [protected, inherited]¶
Returns the exact value. The exact value is the value which QwtDoubleRange::value would return if the value were not adjusted to the step raster. It differs from the current value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before. This function is intended for internal use in derived classes.void QwtAbstractSlider::fitValue (doublevalue) [virtual, slot]¶
Set the slider's value to the nearest integer multiple of the step size. Parameters:value Value
See also:
setValue(), incValue()
virtual void QwtAbstractSlider::getScrollMode (const QPoint &p, int &scrollMode, int &direction) [protected, pure virtual]¶
Determine what to do when the user presses a mouse button. This function is abstract and has to be implemented by derived classes. It is called on a mousePress event. The derived class can determine what should happen next in dependence of the position where the mouse was pressed by returning scrolling mode and direction. QwtAbstractSlider knows the following modes:- QwtAbstractSlider::ScrNone
- Scrolling switched off. Don't change the value.
- QwtAbstractSlider::ScrMouse
- Change the value while the user keeps the button pressed and moves the mouse.
- QwtAbstractSlider::ScrTimer
- Automatic scrolling. Increment the value in the specified direction as long as the user keeps the button pressed.
- QwtAbstractSlider::ScrPage
- Automatic scrolling. Same as ScrTimer, but increment by page size.
p point where the mouse was
pressed
Return values:
scrollMode The scrolling mode
direction direction: 1, 0, or -1.
virtual double QwtAbstractSlider::getValue (const QPoint &p) [protected, pure virtual]¶
Determine the value corresponding to a specified poind. This is an abstract virtual function which is called when the user presses or releases a mouse button or moves the mouse. It has to be implemented by the derived class. Parameters:p point
void QwtDoubleRange::incPages (intnPages) [virtual, inherited]¶
Increment the value by a specified number of pages. Parameters:nPages Number of pages to increment. A
negative number decrements the value.
Warning:
The Page size is specified in the
constructor.
void QwtAbstractSlider::incValue (intsteps) [virtual, slot]¶
Increment the value by a specified number of steps. Parameters:steps number of steps
See also:
setValue()
bool QwtAbstractSlider::isReadOnly () const In read only mode the slider can't be controlled by mouse or keyboard.¶
Returns:true if read only
See also:
setReadOnly()
bool QwtAbstractSlider::isValid () const [inline] See also:¶
QwtDblRange::isValid()
void QwtAbstractSlider::keyPressEvent (QKeyEvent *e) [protected, virtual] Handles key events¶
- •
- Key_Down, KeyLeft
Decrement by 1
- •
- Key_Up, Key_Right
Increment by 1
e Key event
See also:
isReadOnly()
double QwtAbstractSlider::mass () const [virtual] Returns:¶
mass
See also:
setMass()
double QwtDoubleRange::maxValue () const [inherited]¶
Returns the value of the second border of the range. maxValue returns the value which has been specified as the second parameter in QwtDoubleRange::setRange. See also:setRange()
double QwtDoubleRange::minValue () const [inherited]¶
Returns the value at the first border of the range. minValue returns the value which has been specified as the first parameter in setRange(). See also:setRange()
void QwtAbstractSlider::mouseMoveEvent (QMouseEvent *e) [protected, virtual] Mouse Move Event handler¶
Parameters:e Mouse event
void QwtAbstractSlider::mousePressEvent (QMouseEvent *e) [protected, virtual] Mouse press event handler¶
Parameters:e Mouse event
void QwtAbstractSlider::mouseReleaseEvent (QMouseEvent *e) [protected, virtual] Mouse Release Event handler¶
Parameters:e Mouse event
Qt::Orientation QwtAbstractSlider::orientation () const Returns:¶
Orientation
See also:
setOrientation()
int QwtDoubleRange::pageSize () const [inherited]¶
Returns the page size in steps.bool QwtDoubleRange::periodic () const [inherited]¶
Returns true if the range is periodic. See also:setPeriodic()
double QwtDoubleRange::prevValue () const [protected, inherited]¶
Returns the previous value.void QwtDoubleRange::rangeChange () [protected, virtual, inherited]¶
Notify a change of the range. This virtual function is called whenever the range changes. The default implementation does nothing. Reimplemented in QwtCounter, QwtDial, and QwtSlider.void QwtAbstractSlider::setMass (doubleval) [virtual]¶
Set the slider's mass for flywheel effect. If the slider's mass is greater then 0, it will continue to move after the mouse button has been released. Its speed decreases with time at a rate depending on the slider's mass. A large mass means that it will continue to move for a long time. Derived widgets may overload this function to make it public. Parameters:val New mass in kg
See also:
mass()
void QwtAbstractSlider::setOrientation (Qt::Orientationo) [virtual]¶
Set the orientation. Parameters:o Orientation. Allowed values are
Qt::Horizontal and Qt::Vertical.
void QwtDoubleRange::setPeriodic (booltf) [inherited]¶
Make the range periodic. When the range is periodic, the value will be set to a point inside the interval such thatpoint = value + n * width .fi
if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.
Parameters:
tf true for a periodic range
void QwtAbstractSlider::setPosition (const QPoint &p) [protected, virtual] Move the slider to a specified point, adjust the value and emit signals if necessary.¶
void QwtDoubleRange::setRange (doublevmin, doublevmax, doublevstep = 0.0, intpageSize = 1) [inherited]¶
Specify range and step size. Parameters:vmin lower boundary of the interval
vmax higher boundary of the interval
vstep step width
pageSize page size in steps
Warning:
- •
- A change of the range changes the value if it lies outside the new range. The current value will *not* be adjusted to the new step raster.
- •
- vmax < vmin is allowed.
- •
- If the step size is left out or set to zero, it will be set to 1/100 of the interval length.
- •
- If the step size has an absurd value, it will be corrected to a better one.
void QwtAbstractSlider::setReadOnly (boolreadOnly) [virtual, slot] En/Disable read only mode¶
In read only mode the slider can't be controlled by mouse or keyboard. Parameters:readOnly Enables in case of true
See also:
isReadOnly()
void QwtDoubleRange::setStep (doublevstep) [inherited]¶
Change the step raster. Parameters:vstep new step width
Warning:
The value will not be adjusted to the
new step raster.
void QwtAbstractSlider::setTracking (boolenable)¶
Enables or disables tracking. If tracking is enabled, the slider emits a valueChanged() signal whenever its value changes (the default behaviour). If tracking is disabled, the value changed() signal will only be emitted if:- •
- the user releases the mouse button and the value has changed or
- •
- at the end of automatic scrolling.
enable true (enable) or false (disable)
tracking.
void QwtAbstractSlider::setUpdateTime (intt)¶
Specify the update interval for automatic scrolling. Parameters:t update interval in milliseconds
See also:
getScrollMode()
void QwtAbstractSlider::setValid (boolvalid) [inline] Parameters:¶
valid true/false
See also:
QwtDblRange::isValid()
void QwtAbstractSlider::setValue (doubleval) [virtual, slot]¶
Move the slider to a specified value. This function can be used to move the slider to a value which is not an integer multiple of the step size. Parameters:val new value
See also:
fitValue()
void QwtAbstractSlider::sliderMoved (doublevalue) [signal] This signal is emitted when the user moves the slider with the mouse.¶
Parameters:value new value
void QwtAbstractSlider::sliderPressed () [signal] This signal is emitted when the user presses the movable part of the slider (start ScrMouse Mode).¶
void QwtAbstractSlider::sliderReleased () [signal] This signal is emitted when the user releases the movable part of the slider.¶
double QwtDoubleRange::step () const [inherited] Returns:¶
the step size
See also:
setStep(), setRange()
void QwtDoubleRange::stepChange () [protected, virtual, inherited]¶
Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing.void QwtAbstractSlider::stopMoving ()¶
Stop updating if automatic scrolling is active.void QwtAbstractSlider::timerEvent (QTimerEvent *e) [protected, virtual] Qt timer event¶
Parameters:e Timer event
double QwtDoubleRange::value () const [inherited]¶
Returns the current value. Reimplemented in QwtCounter.void QwtAbstractSlider::valueChange () [protected, virtual] Notify change of value¶
This function can be reimplemented by derived classes in order to keep track of changes, i.e. repaint the widget. The default implementation emits a valueChanged() signal if tracking is enabled. Reimplemented from QwtDoubleRange. Reimplemented in QwtDial, QwtSlider, and QwtWheel.void QwtAbstractSlider::valueChanged (doublevalue) [signal]¶
Notify a change of value. In the default setting (tracking enabled), this signal will be emitted every time the value changes ( see setTracking() ). Parameters:value new value
void QwtAbstractSlider::wheelEvent (QWheelEvent *e) [protected, virtual] Wheel Event handler¶
Parameters:e Whell event
Author¶
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