NSSliderCell ovidiu@net-community.com 1996,1999 Free Software Foundation, Inc. Class Description

An NSSliderCell controls the behaviour and appearance of an associated NSSlider, or a single slider in an NSMatrix. Tick marks are defined in the official standard, but are not implemented in GNUstep.

An NSSliderCell can be customized through its set... methods. If these do not provide enough customization, a subclass can be created, which overrides any of the follwing methods: knobRectFlipped:, drawBarInside:flipped:, drawKnob:, or prefersTrackingUntilMouseUp.

AppKit/NSSliderCell.h NSCoding prefersTrackingUntilMouseUp

The default implementation returns YES, so that the slider continues to track the user's movement even if the cursor leaves the slider's track.

Do not call this method directly. Override it in subclasses where the tracking behaviour needs to be different.

allowsTickMarkValuesOnly altIncrementValue Returns the value by which the slider is incremented when the user holds down the ALT key. closestTickMarkValueToValue: aValue drawBarInside: rect flipped: flipped

Draws the slider's track, not including the bezel, in aRect flipped indicates whether the control view has a flipped coordinate system.

Do not call this method directly, it is provided for subclassing only.

drawKnob

Calculates the rect in which to draw the knob, then calls drawKnob: Before calling this method, a lockFocus message must be sent to the cell's control view.

When subclassing NSSliderCell, do not override this method. Override drawKnob: instead.

drawKnob: knobRect

Draws the knob in knobRect. Before calling this method, a lockFocus message must be sent to the cell's control view.

Do not call this method directly. It is included for subclassing only.

indexOfTickMarkAtPoint: point 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. knobRectFlipped: flipped

Returns the rect in which to draw the knob, based on the coordinate system of the NSSlider or NSMatrix this NSSliderCell is associated with. flipped indicates whether or not that coordinate system is flipped, which can be determined by sending the isFlipped message to the associated NSSlider or NSMatrix.

Do not call this method directly. It is included for subclassing only.

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 rectOfTickMarkAtIndex: index setAllowsTickMarkValuesOnly: flag setAltIncrementValue: increment Sets the value by which the slider will be be incremented when with the ALT key down to increment. setKnobThickness: thickness 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 sliders represents to maxValue. setNumberOfTickMarks: numberOfTickMarks setTickMarkPosition: position setTitle: title 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: color Sets the colour with which the title will be drawn to color. setTitleFont: font Sets the font with which the title will be drawm to font. tickMarkPosition tickMarkValueAtIndex: index title 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. trackRect Returns the rect of the track, minus the bezel.