# NSSlider

ovidiu@net-community.com
far@ix.netcom.com
1996 Free Software Foundation, Inc.
Class Description

An NSSlider displays, and allows control of, some value in the application. It represents a continuous stream of values of type `float`, which can be retrieved by the method `floatValue` and set by the method `setFloatValue:`.

This control is a continuous control. It sends its action message as long as the user is manipulating it. This can be changed by passing `NO` to the `setContinuous:` message of a given NSSlider.

Although methods for adding and managing a title are provided, the slider's knob can cover this title, so it is recommended that a label be added near the slider, for identification.

As with many controls, NSSlider relies on its cell counterpart, NSSliderCell. For more information, please see the specification for NSSliderCell.

Use of an NSSlider to do the role of an NSScroller is not recommended. A scroller is intended to represent the visible portion of a view, whereas a slider is intended to represent some value.

AppKit/NSSlider.h
Description forthcoming.
acceptsFirstMouse:
theEvent
Returns `YES` by default. This will allow the first click sent to the slider, when in an inactive window, to both bring the window into focus and manipulate the slider.
allowsTickMarkValuesOnly
Description forthcoming.
altIncrementValue
Returns the value by which the slider will be incremented if the user holds down the ALT key.
closestTickMarkValueToValue:
aValue
Description forthcoming.
image
Returns the image drawn in the slider's track. Returns `nil` if this has not been set.
indexOfTickMarkAtPoint:
point
Description forthcoming.
isVertical
Returns whether or not the slider is vertical. If, for some reason, this cannot be determined, for such reasons as the slider is not yet displayed, this method returns -1. Generally, a slider is considered vertical if its height is greater than its width.
knobThickness
Returns the thickness of the slider's knob. This value is in pixels, and is the size of the knob along the slider's track.
maxValue
Returns the maximum value that the slider represents.
minValue
Returns the minimum value that the slider represents.
numberOfTickMarks
Description forthcoming.
rectOfTickMarkAtIndex:
index
Description forthcoming.
setAllowsTickMarkValuesOnly:
flag
Description forthcoming.
setAltIncrementValue:
increment
Sets the value by which the slider will be incremented, when the ALT key is held down, to increment.
setImage:
backgroundImage
Sets the image to be displayed in the slider's track to barImage.
setKnobThickness:
aFloat
Sets the thickness of the knob to thickness , in pixels. This value sets the amount of space which the knob takes up in the slider's track.
setMaxValue:
aDouble
Sets the maximum value that the sliders represents to maxValue.
setMinValue:
aDouble
Sets the minimum value that the slider represents to minValue.
setNumberOfTickMarks:
numberOfTickMarks
Description forthcoming.
setTickMarkPosition:
position
Description forthcoming.
setTitle:
aString
Sets the title of the slider to barTitle. This title is displayed on the slider's track, behind the knob.
setTitleCell:
aCell
Sets the cell used to draw the title to titleCell.
setTitleColor:
aColor
Sets the colour with which the title will be drawn to color.
setTitleFont:
fontObject
Sets the font with which the title will be drawm to font.
tickMarkPosition
Description forthcoming.
tickMarkValueAtIndex:
index
Description forthcoming.
title
Returns the title of the slider as an `NSString`.
titleCell
Returns the cell used to draw the title.
titleColor
Returns the colour used to draw the title.
titleFont
Returns the font used to draw the title.