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| __NOTOC__
| | {{ Moved To Community | KDE_Visual_Design_Group/HIG/Slider }} |
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| == Purpose ==
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| A ''slider'' is a widget with which a user may set a value by moving an indicator, usually in a horizontal fashion. The user may also click on a point on the slider to change the setting. It is different from a scrollbar in that it is typically used to adjust a value without changing the format of the display or the other information on the screen. A slider is used to set defined, contiguous values or a range of discrete values. It is a good choice when values have a relative quantity, not a numeric value. Usually, changes made on the slider are shown immediately. That instant feedback supports input that is not necessarily precise. Compared with spin controls a slider provides faster changes within a larger range but with lower accuracy. Sliders are almost solely operable by mouse.
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| == Guidelines ==
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| === Is this the right control ===
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| * Use a slider when adjusting the value relative to its current value is more important than choosing an absolute value.
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| * Use a slider when it is useful for the user to control the rate of change of the value in real time.
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| * If the value is open-ended on one or both ends, consider using a [[../Spin_Box|Spin Box]] instead.
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| === Behavior ===
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| * Try to give immediate feedback while user makes a selection.
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| * Size the control so that a user can easily set the desired value.
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| * Do not use a non-linear scale, e.g. logarithmic.
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| === Appearance ===
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| [[Image:Slider_Mockup.png]]
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| * Mark significant values along the length of the slider with text or tick marks.
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| * Label the minimum and the maximum.
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| * Label the slider with a text label to its left, using sentence capitalization. Provide an access key in the label that allows the user to give focus directly to the slider.
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| * Align the label horizontally in line the slider.
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| * Add the unit to the current value caption, if appropriate.
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| * Label the range of values; use tick marks and value label; don't label every tick mark.
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| == Implementation ==
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| * {{qt|QSlider}}
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| [[Category:Usability]][[Category:Behavior]][[Category:Editing_and_Manipulation]][[Category:Constrained_input]]
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