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QSlider Class Reference

The QSlider widget provides a vertical or horizontal slider. More...

#include <QSlider>

Inherits QAbstractSlider.

Public Types

Writable Properties

Read-Only Properties

Public Functions

Public Slots

Signals

Static Public Members

Protected Functions


Detailed Description

The QSlider widget provides a vertical or horizontal slider.

The slider is the classic widget for controlling a bounded value. It lets the user move a slider handle along a horizontal or vertical groove and translates the handle's position into an integer value within the legal range.

QSlider has very few of its own functions; most of the functionality is in QAbstractSlider. The most useful functions are setValue() to set the slider directly to some value; triggerAction() to simulate the effects of clicking (useful for shortcut keys); setSingleStep(), setPageStep() to set the steps; and setMinimum() and setMaximum() to define the range of the scroll bar.

QSlider provides methods for controlling tickmarks. You can use setTickmarks() to indicate where you want the tickmarks to be, setTickInterval() to indicate how many of them you want.

QSlider inherits a comprehensive set of signals:

SignalEmitted when
valueChanged()the slider's value has changed. The tracking() determines whether this signal is emitted during user interaction.
sliderPressed()the user starts to drag the slider.
sliderMoved()the user drags the slider.
sliderReleased()the user releases the slider.

QSlider only provides integer ranges. Note that although QSlider handles very large numbers, it becomes difficult for users to effectivley use a slider for very large ranges.

A slider accepts focus on Tab and provides both a mouse wheel and a keyboard interface. The keyboard interface is the following:

Screenshot in Motif style Screenshot in Windows style

GUI Design Handbook: Slider

See also QScrollBar and QSpinBox.


Member Type Documentation

enum QSlider::TickSetting

This enum specifies where the tickmarks are to be drawn relative to the slider's groove and the handle the user moves.

QSlider::NoTickMarksdo not draw any tickmarks.
QSlider::TickMarksBothdraw tickmarks on both sides of the groove.
QSlider::TickMarksAbovedraw tickmarks above the (horizontal) slider
QSlider::TickMarksBelowdraw tickmarks below the (horizontal) slider
QSlider::TickMarksLeftdraw tickmarks to the left of the (vertical) slider
QSlider::TickMarksRightdraw tickmarks to the right of the (vertical) slider

Property Documentation

tickInterval : int

This property holds the interval between tickmarks.

This is a value interval, not a pixel interval. If it is 0, the slider will choose between lineStep() and pageStep(). The initial value of tickInterval is 0.

Access functions:

See also QRangeControl::lineStep() and QRangeControl::pageStep().

tickmarks : TickSetting

This property holds the tickmark settings for this slider.

The valid values are in QSlider::TickSetting. The default is NoMarks.

Access functions:

See also tickInterval.


Member Function Documentation

QSlider::QSlider ( QWidget * parent = 0 )

Constructs a vertical slider.

The parent argument is sent to the QAbstractSlider constructor.

QSlider::QSlider ( Qt::Orientation orientation, QWidget * parent = 0 )

Constructs a slider.

The orientation must be Qt::Vertical or Qt::Horizontal.

The parent argument is sent on to the QAbstractSlider constructor.

QSlider::~QSlider ()

Destructor.


Copyright © 2004 Trolltech. Trademarks
Qt 4.0.0-tp2