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The QSlider widget provides a vertical or horizontal slider. More...
#include <QSlider>
Inherits QAbstractSlider.
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 setTickPosition() 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:
| Signal | Emitted 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 use a slider accurately 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:
See also QScrollBar, QSpinBox, and GUI Design Handbook: Slider.
This enum specifies where the tick marks are to be drawn relative to the slider's groove and the handle the user moves.
| Constant | Value | Description |
|---|---|---|
| QSlider::NoTicks | 0 | do not draw any tick marks. |
| QSlider::TicksBothSides | 3 | draw tick marks on both sides of the groove. |
| QSlider::TicksAbove | 1 | draw tick marks above the (horizontal) slider |
| QSlider::TicksBelow | 2 | draw tick marks below the (horizontal) slider |
| QSlider::TicksLeft | TicksAbove | draw tick marks to the left of the (vertical) slider |
| QSlider::TicksRight | TicksBelow | draw tick marks to the right of the (vertical) slider |
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 tickPosition, lineStep(), and pageStep().
This property holds the tickmark position for this slider.
The valid values are in QSlider::TickPosition. The default is NoTicks.
Access functions:
See also tickInterval.
Constructs a vertical slider.
The parent argument is sent to the QAbstractSlider constructor.
Constructs a slider.
The orientation must be Qt::Vertical or Qt::Horizontal.
The parent argument is sent on to the QAbstractSlider constructor.
Destructor.
| Copyright © 2005 Trolltech | Trademarks | Qt 4.1.0 |
