~~NOTOC~~
{{ :xfce:xfce4-settings.accessibility.png?nolink|}}
====== xfce4-settings - Accessibility ======

  * **[[#Assistive Technologies|Assistive Technologies]]**
  * **[[#Keyboard|Keyboard]]**
      * **[[#Sticky Keys|Sticky Keys]]**
      * **[[#Slow Keys|Slow Keys]]**
      * **[[#Bounce Keys|Bounce Keys]]**
  * **[[#Mouse|Mouse]]**

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===== Assistive Technologies =====

Xfce provides several customisable keyboard and mouse accessibility options. 

<figure "Accessibility Preferences: Assistive Technologies Tab">
{{:xfce:xfce4-settings:4.20:xfce4-settings-accessibility-at.png|Accessibility Preferences: Assistive Technologies Tab}}
</figure>

? Enable Assistive Technologies
! When {gui>Assistive Technologies} is enabled, the Xfce desktop is enabled, xfce4-session will load the required modules so the toolkit (Gtk) can communicate with [[http://live.gnome.org/Orca|Orca]], the suite of utilities for the visually impaired.

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===== Keyboard =====

<figure "Accessibility Preferences: Keyboard Accessibility Tab">
{{:xfce:xfce4-settings:4.20:xfce4-settings-accessibility-keyboard.png|Accessibility Preferences: Keyboard Accessibility Tab}}
</figure>

These settings are here to help people with certain disabilities get the most out of their keyboards.

=== Sticky Keys ===

When Sticky Keys are active, you can press key combinations in sequence instead of at the same time. For instance,
{key>Ctrl} followed by {key>C} (instead of {key>Ctrl-C}) will copy selected text.

=== Slow Keys ===

When Slow Keys are active, the keyboard won't register a keystroke until you hold the key down for a certain length of time. The default time is 500 milliseconds, or half a second. You can move the slider with the mouse to adjust the length of time.

=== Bounce Keys ===

When Bounce Keys are active, the keyboard won't accept a keystroke until there has been a certain interval of time since the previous keystroke. The default interval is 500 milliseconds. You can move the slider with the mouse to adjust the length of time.

 [[|Back To Top]] 

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===== Mouse =====

<figure "Accessibility Preferences: Mouse Accessibility Tab">
{{:xfce:xfce4-settings:4.20:xfce4-settings-accessibility-mouse.png|Accessibility Preferences: Mouse Accessibility Tab}}
</figure>

Mouse Emulation lets you move the mouse pointer with the arrow keys on the numeric keypad. As seen in the above screenshot, the values that can be set are:

  * Acceleration delay (in milliseconds)
  * Repeat interval (in milliseconds)
  * Acceleration time (in milliseconds)
  * Maximum speed (in pixels per second)
  * Acceleration profile

(Acceleration profiles are mathematical formulas. [[http://www.x.org/wiki/Development/Documentation/PointerAcceleration#Acceleration_profiles_.28for_the_inclined_programmer.29|The X.org wiki]] says: "Acceleration profiles translate device velocity into an acceleration to be imposed on the pointer.")

The Mouse Emulation module is included primarily to help people who cannot use a standard mouse. There are no optimal settings; you will need to experiment to find which settings work the best for you.

[[|Back To Top]]
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