path: root/trunk/gnome2-accessibility-guide/C/mobility.xml

<chapter id="ats-1">
<title>Mobility Impairments</title>
<para>Mobility impairments can be caused by arthritis, stroke, cerebral palsy, Parkinson's disease, multiple sclerosis, and loss of limbs or digits, among others. Poor muscle control or weaknesses can make using standard keyboards and mouse devices difficult. For instance, some people are unable to type two keys simultaneously, while others tend to hit multiple keys or to bounce keys when pressing or releasing them. People who are able to use only one hand likewise have difficulties with some keyboard and mouse tasks. </para>
<para>The technologies which can assist those with mobility impairments are:</para>
<itemizedlist>
<listitem><para><emphasis>On-Screen Keyboard</emphasis> - lets users select keys using a pointing method such as pointing devices, switches, or Morse-code input systems.</para></listitem>
<listitem><para><emphasis>Mouse and Keyboard Enhancements</emphasis> - helpful for users who have trouble typing and controlling a mouse or a keyboard.</para></listitem>
</itemizedlist>

<section>
<title>On-Screen Keyboard</title>
<indexterm>
<primary>On-Screen Keyboard</primary>
</indexterm>
<indexterm>
<primary>GOK</primary>
</indexterm>
<para>The <application>On-Screen Keyboard</application>
application displays virtual keyboards on your desktop. You can use the standard
mouse pointer or alternative pointing device to operate the virtual keyboards. <application>On-Screen Keyboard</application> displays the following types of keyboards:</para>
<itemizedlist>
<listitem>
<para>Compose keyboards that enable you to compose text. To type
alphanumeric characters, you select the characters on the compose keyboard.</para>
</listitem>
<listitem>
<para>Dynamic keyboards that <application>On-Screen Keyboard</application>
generates to reflect the applications that are currently running on the desktop.
For example, <application>On-Screen Keyboard</application> generates keyboards
that contain keys to represent the applications that are running on your desktop
or the menus that are contained in an application. </para>
</listitem>
</itemizedlist>
<para>To start <application>On-Screen Keyboard</application>, choose <menuchoice><guimenu>Applications</guimenu><guisubmenu>Accessibility</guisubmenu><guimenuitem>On-Screen
Keyboard</guimenuitem></menuchoice>. For more information about the <application>On-Screen Keyboard</application> application, see the <ulink type="help" url="ghelp:gok"> Help for <application>On-Screen Keyboard</application></ulink>.</para>
<section id="ats-5">
<title>Maximizing Application Windows for On-Screen Keyboard Users</title>
<indexterm>
<primary>maximizing Terminal for On-Screen Keyboard users</primary>
</indexterm>
<para>If you are an <application>On-Screen Keyboard</application>
user, you cannot use any application in Full Screen mode because the application
window obscures the <application>On-Screen Keyboard</application> display.</para>
<para>To resize the window for use with the <application>On-Screen Keyboard</application> application, perform the following steps:</para>
<orderedlist>
<listitem>
<para>Do not enable the Full Screen mode in the application.</para>
</listitem>
<listitem>
<para>Give focus to the application window.</para>
</listitem>
<listitem>
<para>Press <keycap>F10</keycap> to maximize the application.</para>
</listitem>
</orderedlist>
</section>
</section>


<section id="dtconfig-0">
<title>Mouse and Keyboard Enhancements</title>
<para>This section describes how to configure the mouse and keyboard to make
these devices accessible to more users.</para>
<section id="dtconfig-1">
<title>Configuring the Mouse</title>
<para>Use the <guilabel>Mouse</guilabel> preference tool to configure the
mouse to suit your needs. To open the <guilabel>Mouse</guilabel> preference
tool, choose <menuchoice><guimenu>System</guimenu><guisubmenu>Preferences</guisubmenu><guimenuitem>Mouse</guimenuitem></menuchoice>. The <guilabel>Mouse Preferences</guilabel> dialog is displayed.</para>
<section id="dtconfig-2">
<title>To Configure the Behavior of the Mouse</title>
<para>The following sections describe how to modify the behavior of the mouse
to suit your needs. </para>
<section id="dtconfig-3">
<title>To Configure the Mouse for Left-Handed Use</title>
<indexterm>
<primary>mouse</primary>
<secondary>left-handed</secondary>
</indexterm>
<para>To configure the mouse for left-handed use, click on the <guilabel>Buttons</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog,
then select the <guilabel>Left-handed mouse</guilabel> option. When you select
this option, the system swaps the functions of the left mouse button and the
right mouse button immediately.</para>
</section>
<section id="dtconfig-4">
<title>To Configure the Double-Click Behavior</title>
<indexterm>
<primary>mouse</primary>
<secondary>double-click behavior</secondary>
</indexterm>
<para>If you have difficulty double-clicking, you can increase
the period of time that the system allows to elapse between the first click
and the second click of a double-click. For example, if the double-click timeout
setting is 0.4 seconds, you must perform the second click of a double-click
within 0.4 seconds of the first click. If the second click occurs more than
0.4 seconds after the first click, the system interprets the two clicks as
two single clicks. </para>
<para>To configure the double-click timeout setting, perform the following
steps:</para>
<orderedlist>
<listitem>
<para>Click on the <guilabel>Buttons</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog.</para>
</listitem>
<listitem>
<para>Use the <guilabel>Timeout</guilabel> slider to specify the
timeout in seconds that the system allows between the two clicks of a double-click. Moving the slider to the right will increase the timeout interval in 0.1 second intervals.  In the same manner, moving the slider to the left will decrease the timeout in 0.1 second intervals.</para>
</listitem>
<listitem>
<para>Double-click on the light bulb to the right of the slider
to test the setting. If you perform the two clicks of the double-click within
the timeout specified, the light bulb lights up fully to display a yellow
glow around the bulb. If you do not double-click within the timeout specified,
the light bulb does not light fully. You should increase the timeout setting
and try again. When the light bulb lights, the timeout setting is suitable
for your needs. </para>
</listitem>
</orderedlist>
</section>
<section id="dtconfig-20">
<title>To Change the Size of the Mouse Pointer</title>
<indexterm>
<primary>mouse</primary>
<secondary>pointer size</secondary>
</indexterm>
<indexterm>
<primary>pointer</primary>
<secondary>size</secondary>
</indexterm>
<para>To change the size of the mouse pointer that is displayed
on the desktop, perform the following steps:</para>
<orderedlist>
<listitem>
<para>Click on the <guilabel>Pointers</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog. </para>
</listitem>
<listitem>
<para>This will display a list of pointer themes and sizes available.</para>
</listitem>
<listitem>
<para>By default, GNOME does not include mouse pointer themes.  Information about installing and using pointer themes can be found in the <ulink type="help" url="ghelp:user-guide?goscustdesk-54">User Guide</ulink>.</para>
</listitem>
</orderedlist>
<!-- GNOME does not currently ship with default pointers.  When it does, this needs updated. -->
<note>
<para>On some platforms you must log out and log in again for this setting to take effect.</para>
</note>
</section>
<section id="dtconfig-6">
<title>To Locate the Mouse Pointer</title>
<indexterm>
<primary>mouse</primary>
<secondary>locating pointer</secondary>
</indexterm>
<para>If you have difficulty locating the mouse pointer on the
screen, you can enable an option to highlight the pointer when you press the <keycap>Control</keycap> key. To enable this option, click on the <guilabel>Pointers</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog, then
select the <guilabel>Highlight the pointer when you press Ctrl</guilabel>
option. When you press <keycap>Control</keycap>, the system displays an animation
around the pointer to highlight the pointer. </para>
<note>
<para>On some platforms, you must log out and log in again before this
setting takes effect.</para>
</note>
</section>
<section id="dtconfig-5">
<title>To Configure the Speed and Sensitivity of the Mouse</title>
<indexterm>
<primary>mouse</primary>
<secondary>speed and sensitivity</secondary>
</indexterm>
<para>To configure the speed and sensitivity of the mouse, perform
the following steps: </para>
<orderedlist>
<listitem>
<para>Click on the <guilabel>Motion</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog. </para>
</listitem>
<listitem>
<para>Configure the following options:</para>
<variablelist>
<varlistentry>
<term>Acceleration</term>
<listitem>
<para>Use the slider to specify
the speed at which the mouse pointer moves around the screen when you move
your mouse. </para>
<para>If you select a low setting, the mouse pointer moves at a speed similar
to the speed at which you are physically moving the mouse. This means that
you need to physically move the mouse larger distances to cover the screen
area. If you select a high setting, the mouse pointer moves at a faster speed
than the speed at which you physically move the mouse. This means that you
need to physically move the mouse small distances to cover the screen area.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Sensitivity</term>
<listitem>
<para>Use the slider to specify
how responsive the mouse pointer is to movements of your mouse. Moving the slider to the right will increase the sensitivity and moving it to the left will decrease the sensitivity.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Threshold</term>
<listitem>
<para>Use the slider to specify
the distance that you must move an item before the system interprets the move
action as a drag-and-drop action.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</orderedlist>
</section>
</section>
<section id="dtconfig-7">
<title>To Configure the Cursor</title>
<indexterm>
<primary>cursor</primary>
<secondary>stop blinking</secondary>
</indexterm>
<para>The following section describes how to modify the display characteristics
of the cursor. </para>
<section id="dtconfig-9">
<title>To Stop the Cursor Blinking</title>
<para>To stop the cursor blinking in text boxes and fields, perform the following
steps: </para>
<orderedlist>
<listitem>
<para>Choose <menuchoice><guimenu>System</guimenu><guisubmenu>Preferences</guisubmenu><guimenuitem>Keyboard</guimenuitem></menuchoice> to start the <application>Keyboard</application> preference tool.</para>
</listitem>
<listitem>
<para>In the <guilabel>Keyboard</guilabel> tabbed section, deselect
the <guilabel>Cursor blinks in text boxes and fields</guilabel> option.</para>
</listitem>
</orderedlist>
</section>
</section>
<section id="dtconfig-10">
<title>To Use the Keyboard to Emulate the Mouse</title>
<para>If you have difficulty using a mouse, you can use the keyboard to emulate
the mouse functions. See <xref linkend="dtconfig-14"/> of this guide for more
information.</para>
</section>
</section>
<section id="dtconfig-11">
<title>Configuring the Keyboard</title>
<para>Use the <application>Keyboard</application> preference tool, to configure the keyboard accessibility options. To open the <application>Keyboard</application> preference tool, choose <menuchoice><guimenu>System</guimenu><guisubmenu>Preferences</guisubmenu><guimenuitem>Keyboard</guimenuitem></menuchoice>.  Accessibility options can be enabled by selecting <guilabel>Accessibility</guilabel>.  This will open a new dialog, <application>Keyboard Accessibility Preferences</application>, also known as <application>AccessX</application>.</para>
<para>The <guilabel>Keyboard Accessibility Preferences (AccessX)</guilabel>
dialog enables you to customize your keyboard in the following ways:</para>
<itemizedlist>
<listitem>
<para>To use the numeric keypad to emulate mouse actions. See <xref linkend="dtconfig-14"/>.</para>
</listitem>
<listitem>
<para>To specify the duration for which you must press-and-hold
a key before the system accepts the keypress. See <xref linkend="dtconfig-15"/>.</para>
</listitem>
<listitem>
<para>To ignore rapid, repeated keypresses of the same key. See <xref linkend="dtconfig-16"/>.</para>
</listitem>
<listitem>
<para>To accept key combinations in sequence rather than simultaneously.
See <xref linkend="dtconfig-17"/>.</para>
</listitem>
<listitem>
<para>To emit an audible notification when a user activates or deactivates
a toggle key. See <xref linkend="dtconfig-18"/>.</para>
</listitem>
<listitem>
<para>To ignore long keypresses of the same key and control the
repeat rate of a keypress. See <xref linkend="dtconfig-19"/>.</para>
</listitem>
</itemizedlist>
<section id="dtconfig-13">
<title>To Activate the Keyboard Accessibility Options</title>
<indexterm>
<primary>keyboard accessibility options</primary>
</indexterm>
<para>To activate the keyboard accessibility options, perform the following steps: </para>
<orderedlist>
<listitem>
<para>Choose <menuchoice><guimenu>System</guimenu><guisubmenu>Preferences</guisubmenu><guimenuitem>Keyboard</guimenuitem></menuchoice> and select <guilabel>Accessibility</guilabel></para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable keyboard accessibility features</guilabel> option.</para>
</listitem>
<listitem>
<para>Click on the <guilabel>Basic</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Beep when features turned on or off from
keyboard</guilabel> option to receive an audible notification each time a
user enables or disables a keyboard accessibility option using the following
keyboard shortcuts:</para>
<itemizedlist>
<listitem>
<para>Press-and-hold <keycap>Shift</keycap> for eight seconds to
enable or disable the slow keys feature. </para>
</listitem>
<listitem>
<para>Press <keycap>Shift</keycap> five times to enable or disable
the sticky keys feature.</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>To automatically disable the keyboard accessibility options
if the options are not used for a specified number of seconds, select the <guilabel>Disable if unused for X seconds</guilabel> option. Use the slider to specify
the number of seconds of keyboard idle time required before the system disables
the keyboard accessibility options. </para>
<para>This option is intended for computers that are shared by a number of
different users, some of whom require the keyboard accessibility options. </para>
</listitem>
<listitem>
<para>Changes made will be instantly applied.</para>
</listitem>
</orderedlist>
</section>
<section id="dtconfig-14">
<title>To Enable the Keyboard to Emulate the Mouse</title>
<indexterm>
<primary>mouse keys</primary>
</indexterm>
<para>The mouse keys feature
enables you to use the numeric keypad on the keyboard to emulate mouse actions.
This feature benefits users who have difficulty using a mouse or other pointing
device. To enable and configure the mouse keys feature, perform the following
steps:</para>
<orderedlist>
<listitem>
<para>In the <application>Keyboard Accessibility Preferences (AccessX)</application> dialog, select the <guilabel>Mouse Keys</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Mouse Keys</guilabel> option.</para>
</listitem>
<listitem>
<para>Configure the following options to determine the behavior
of the mouse pointer when you control the pointer from the numeric keypad:</para>
<variablelist>
<varlistentry>
<term>
<guilabel>Maximum pointer speed</guilabel>
</term>
<listitem>
<para>Use this spin box to specify the maximum speed, in pixels per second,
at which the pointer moves around the screen.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<guilabel>Time to accelerate to maximum speed</guilabel>
</term>
<listitem>
<para>Use this spin box to specify the duration, in milliseconds,
before the pointer accelerates to the maximum pointer speed. </para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<guilabel>Delay between keypress and pointer movement</guilabel>
</term>
<listitem>
<para>Use this spin box to specify the interval,
in milliseconds, between a keypress and the time when the pointer starts to
move. </para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</orderedlist>
<para>When you enable mouse keys, the keys on the numeric keypad have the
following functions:</para>
<table frame="topbot" id="dtconfig-TBL-1">
<title>Numeric Keypad to Mouse Function Mapping</title>
<tgroup cols="2" colsep="0" rowsep="0">
<colspec colname="colspec0" colwidth="52.78*"/>
<colspec colname="colspec1" colwidth="47.22*"/>
<thead>
<row rowsep="1">
<entry>
<para>Numeric Keypad Keys</para>
</entry>
<entry>
<para>Function</para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry valign="top">
<para>1, 2, 3, 4, 6, 7, 8, 9</para>
</entry>
<entry valign="top">
<para>Move the mouse pointer around the screen</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>5</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Mouse button click</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>0</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Mouse button toggle</para>
</entry>
</row>
<row>
<entry valign="top">
<para>/</para>
</entry>
<entry valign="top">
<para>Primary mouse button</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>*</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Secondary mouse button</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>-</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Tertiary mouse button</para>
</entry>
</row>
</tbody>
</tgroup>
</table>

<para>The toggle mouse button key enable the currently selected mouse button until the <guilabel>Mouse button click</guilabel> key is pressed.  This allows you to perform drag and drop operations.</para>

<para>The <guilabel>Mouse button click</guilabel> emulates the currently selected mouse button.  Pressing <keycap>/</keycap>, <keycap>*</keycap> or <keycap>-</keycap> will change the behaviour of this.  The currently selected mouse button can be seen in the <application>Keyboard Accessibility Status</application> panel application, discussed in <xref linkend="dtconfig-21"/>.</para>

<note>
<para>The <guilabel>Primary mouse button</guilabel> is the left mouse button for right handed people.  The <guilabel>Secondary mouse button</guilabel> is the right mouse button and the <guilabel>Tertiary mouse button</guilabel> is the middle mouse button.</para>
</note>

<para>Some Solaris systems also use the function keys to emulate the mouse
buttons. The common function key to mouse button mappings are described in
the following table.</para>
<table frame="topbot" id="dtconfig-TBL-2">
<title>Function Key to Mouse Function Mapping on Solaris Systems</title>
<tgroup cols="2" colsep="0" rowsep="0">
<colspec colname="colspec0" colwidth="52.78*"/>
<colspec colname="colspec1" colwidth="47.22*"/>
<thead>
<row rowsep="1">
<entry>
<para>Function Key</para>
</entry>
<entry>
<para>Function</para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry valign="top">
<para>F2</para>
</entry>
<entry valign="top">
<para>Mouse button 1</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>F3</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Mouse button 2</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>F4</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Mouse button 3</para>
</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="dtconfig-15">
<title>To Enable the Slow Keys Feature</title>
<indexterm>
<primary>slow keys</primary>
</indexterm>
<para>The slow keys feature
enables you to customize how the keyboard handles user input in the following
ways:</para>
<itemizedlist>
<listitem>
<para>Specify the duration for which you must press-and-hold a key
before the system accepts the keypress. This aspect of the feature benefits
users who frequently press keys that they do not intend to press. </para>
</listitem>
<listitem>
<para>Enable audible indications of keyboard input and acceptance.
This aspect of the feature benefits users who cannot see the result of a keypress.</para>
</listitem>
</itemizedlist>
<para>To enable and configure the slow keys feature, perform the following
steps:</para>
<orderedlist>
<listitem>
<para>From the <application>Keyboard Accessibility Preferences (AccessX)</application> dialog, select the <guilabel>Filters</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Slow Keys</guilabel> option. </para>
<tip>
<para>To select or deselect the slow keys feature from the keyboard,
press-and-hold <keycap>Shift</keycap> for eight seconds. This will present a dialog confirming that you with slow keys enabled.  The <keycap>Shift</keycap> keyboard shortcut automatically selects all of the slow keys options.
If you selected the <guilabel>Beep when features turned on or off from the
keyboard</guilabel> option in the <guilabel>Basic</guilabel> tab, after four seconds the system beeps three times to indicate that the system is about to select or deselect the feature.</para>
</tip>
</listitem>
<listitem>
<para>Use the <guilabel>Only accept keys held for</guilabel> slider
or spin box to specify the duration, in milliseconds, for which you must press-and-hold
a key before the system accepts the keypress. Use the <guilabel>Type to test
settings</guilabel> text box to test the slow keys setting and modify the
setting as required. </para>
</listitem>
<listitem>
<para>To enable audible indications of keyboard input and acceptance,
select the following options:</para>
<variablelist>
<varlistentry>
<term>
<guilabel>Beep when key is pressed</guilabel>
</term>
<listitem>
<para>Select this option to hear a beep when you press a key.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<guilabel>Beep when key is accepted</guilabel>
</term>
<listitem>
<para>Select this option to hear a beep when the system accepts
a keypress. </para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<guilabel>Beep when key is rejected</guilabel>
</term>
<listitem>
<para>Select this option to hear a beep when the system rejects
a keypress. The system rejects a keypress if you do not press-and-hold the
key for the duration that is specified in the <guilabel>Only accept keys held
for</guilabel> spin box.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</orderedlist>
</section>
<section id="dtconfig-16">
<title>To Enable the Bounce Keys Feature</title>
<indexterm>
<primary>bounce keys</primary>
</indexterm>
<para>The bounce keys
feature enables you to customize the keyboard to ignore rapid, repeated keypresses
of the same key. For example, users with impaired motor skills might press
the same key several times when they intend to press the key once. This feature
enables you to customize the keyboard to ignore repeated keypresses. </para>
<para>To enable and configure the bounce keys feature, perform the following
steps:</para>
<orderedlist>
<listitem>
<para>From the <application>Keyboard Accessibility Preferences (AccessX)</application> dialog select the <guilabel>Filters</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Bounce Keys</guilabel> option. </para>
</listitem>
<listitem>
<para>Use the <guilabel>Ignore duplicate keypresses within</guilabel>
slider or spin box to specify the duration in milliseconds (ms) after the
first keypress for which the system ignores repeated keypresses of the same
key. For example, if you select a duration of 500 ms, the system ignores all
repeated keypresses of the same key that occur within 500 ms of the first
keypress.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Beep if key is rejected</guilabel> option
to hear an audible indication when the system ignores a key.</para>
</listitem>
</orderedlist>
<note>
<para>If you want to enable the bounce keys feature, ensure that the <guilabel>Enable Slow Keys</guilabel> option is deselected. The slow keys feature requires
you to press a key for a specified duration before the system accepts the
keypress as a valid keypress. If you cannot press the key for the duration
that is specified by the slow keys setting, deselect the <guilabel>Enable
Slow Keys</guilabel> option to enable the system to accept your input.</para>
</note>
</section>
<section id="dtconfig-17">
<title>To Enable the Sticky Keys Feature</title>
<indexterm>
<primary>sticky keys</primary>
</indexterm>
<para>The sticky keys
feature enables you to press the keys in a key combination in sequence rather
than simultaneously. This feature is designed for users who are unable to
press two or more keys simultaneously. </para>
<para>To enable and configure the sticky keys feature, perform the following
steps:</para>
<orderedlist>
<listitem>
<para>From the <application>Keyboard Accessibility Preferences (AccessX)</application> select the <guilabel>Basic</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Sticky Keys</guilabel> option.</para>
<tip>
<para>To enable the sticky keys feature from the keyboard, press <keycap>Shift</keycap> five times. This will present a dialog confirming that you with to enable sticky keys.  The <keycap>Shift</keycap> keyboard shortcut automatically
selects all of the sticky keys options. If you selected the <guilabel>Beep
when features turned on or off from the keyboard</guilabel> option, the system
beeps to indicate that the system is about to select or deselect the feature.
When active, pressing <keycap>shift</keycap> five times in a row will present a dialog asking if you want to disable sticky keys.</para>
</tip>
</listitem>
<listitem>
<para>Select the <guilabel>Beep when modifier is pressed</guilabel>
option to receive an audible indication each time you press a modifier key
such as <keycap>Ctrl</keycap>, <keycap>Alt</keycap>, or <keycap>Shift</keycap>.
This option is useful to remind you whether a modifier key is active or inactive. </para>
</listitem>
<listitem>
<para>Selecting the <guilabel>Disable if two keys pressed
together</guilabel> option will present a dialog with the option to disable sticky keys if two keys are pressed at the same time.</para>
</listitem>
</orderedlist>
<para>You can use the sticky keys feature in latch or lock mode. The following
table describes how to choose a mode and the difference between the two modes.</para>
<table frame="topbot" id="dtconfig-TBL-3">
<title>Sticky Keys Latch or Lock Mode</title>
<tgroup cols="3" colsep="0" rowsep="0">
<colspec colname="colspec0" colwidth="52.78*"/>
<colspec colname="colspec1" colwidth="47.22*"/>
<colspec colname="colspec2" colwidth="47.22*"/>
<thead>
<row rowsep="1">
<entry valign="top">
<para>To use the sticky keys feature in...</para>
</entry>
<entry valign="top">
<para>Press the modifier key...</para>
</entry>
<entry colname="colspec2" valign="top">
<para>The modifier key remains active
until...</para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry valign="top">
<para>Latch mode</para>
</entry>
<entry valign="top">
<para>Once.</para>
</entry>
<entry colname="colspec2" valign="top">
<para>You press
a non-modifier key.</para>
</entry>
</row>
<row>
<entry colname="colspec0" valign="top">
<para>Lock mode</para>
</entry>
<entry colname="colspec1" valign="top">
<para>Twice in quick succession.</para>
</entry>
<entry colname="colspec2" valign="top">
<para>You press the modifier key again.</para>
</entry>
</row>
</tbody>
</tgroup>
</table>
<para>Example 1: If you want to press <keycombo><keycap>Alt</keycap><keycap>F1</keycap></keycombo>,
do the following:</para>
<orderedlist>
<listitem>
<para>Press <keycap>Alt</keycap> to latch the modifier key. The <keycap>Alt</keycap> key remains active.</para>
</listitem>
<listitem>
<para>Press <keycap>F1</keycap>. The key combination is now complete.
After you press <keycap>F1</keycap>, the <keycap>Alt</keycap> modifier key
is no longer active.</para>
</listitem>
</orderedlist>
<para>Example 2: If you want to press <keycombo><keycap>Ctrl</keycap><keycap>Alt</keycap><keycap>Tab</keycap></keycombo>, do the following:</para>
<orderedlist>
<listitem>
<para>Press <keycap>Ctrl</keycap> twice to lock the modifier key.
The <keycap>Ctrl</keycap> key remains active.</para>
</listitem>
<listitem>
<para>Press <keycap>Alt</keycap>. </para>
</listitem>
<listitem>
<para>Press <keycap>Tab</keycap>. The key combination is now complete. </para>
</listitem>
<listitem>
<para>To unlock the modifier key, press <keycap>Ctrl</keycap> again.</para>
</listitem>
</orderedlist>
</section>
<section id="dtconfig-18">
<title>To Enable Audible Notifications for Toggle Keys</title>
<indexterm>
<primary>toggle keys</primary>
<secondary>enabling audio notifications</secondary>
</indexterm>
<para>A toggle key is any key on the keyboard that
can switch between two states. The <keycap>Num Lock</keycap>, <keycap>Caps
Lock</keycap>, and <keycap>Scroll Lock</keycap> keys are toggle keys. Most
toggle keys have an associated light emitting diode (LED) on the keyboard
that lights when the toggle key is active. To assist users with visual impairments,
you can customize the keyboard to emit an audible notification when a user
presses a toggle key. For example, when you press <keycap>Num Lock</keycap>,
you can determine whether the key is toggled or not toggled by the sound that
the keyboard emits. </para>
<para>To enable accessible toggle keys, perform the following steps: </para>
<orderedlist>
<listitem>
<para>From the <application>Keyboard Accessibility Preferences (AccesX)</application> select the <guilabel>Filters</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Toggle Keys</guilabel> option.</para>
</listitem>
</orderedlist>
<para>When you activate the <keycap>Num Lock</keycap>, <keycap>Caps Lock</keycap>,
or <keycap>Scroll Lock</keycap> keys, the system beeps once. When you deactivate
a toggle key, the system beeps twice.</para>
</section>
<section id="dtconfig-19">
<title>To Enable the Repeat Keys Feature</title>
<indexterm>
<primary>repeat keys</primary>
</indexterm>
<para>The repeat keys
feature enables you to repeat a keystroke multiple times without pressing
the key more than once. This feature is designed for users who cannot release
keys quickly, for example users who operate a mouth stick. When you enable
repeat keys, you can specify the duration for which you must press a key before
the key starts to repeat.</para>
<para>To enable and configure the repeat keys feature, perform the following
steps: </para>
<orderedlist>
<listitem>
<para>From the <application>Keyboard Accessibility Preferences (AccessX)</application> select the <guilabel>Basic</guilabel> tab.</para>
</listitem>
<listitem>
<para>Select the <guilabel>Enable Repeat Keys</guilabel> option.</para>
</listitem>
<listitem>
<para>Use the <guilabel>Delay</guilabel> slider or spin box to specify
the duration for which you must press a key before the keyboard interprets
the action as a repeat key. If you have difficulty releasing keys, select
a long time delay. </para>
</listitem>
<listitem>
<para>Use the <guilabel>Speed</guilabel> slider or spin box to specify
the speed at which the keyboard repeats the keypress as input.</para>
</listitem>
</orderedlist>
</section>
</section>
<section id="dtconfig-21">
<title>Using the Keyboard Accessibility Status Panel Application</title>
<indexterm>
<primary>Keyboard Accessibility Status panel application</primary>
</indexterm>
<para>The <application>Keyboard Accessibility Status</application>
panel application shows you the status of the keyboard accessibility features.
This panel application displays icons to indicate which keyboard accessibility
features are enabled in the <application>Keyboard Accessibility</application>
preference tool.</para>
<para>To add the <application>Keyboard Accessibility Status</application>
panel application to a panel, right-click on the panel, then choose <menuchoice><guimenu>Add to Panel</guimenu></menuchoice> and select the <guimenuitem>Keyboard Accessibility Status</guimenuitem>.</para>
<para>The following table describes the icons that the panel application displays
and the status that each icon represents.</para>
<table frame="topbot" id="dtconfig-TBL-25">
<title>Keyboard Accessibility Status Icons</title>
<tgroup cols="2" colsep="0" rowsep="0">
<colspec colname="colspec0" colwidth="21.97*"/>
<colspec colname="colspec1" colwidth="78.03*"/>
<thead>
<row rowsep="1">
<entry>
<para>Icon</para>
</entry>
<entry>
<para>Keyboard Accessibility
Status</para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/accessx.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Keyboard Accessibility Features enabled icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>Keyboard accessibility in general
is available but none of the individual key features are enabled.</para>
</entry>
</row>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/bouncekeys.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Bounce keys enabled icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>The bounce keys feature is
enabled.</para>
</entry>
</row>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/mousekeys.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Mouse keys enabled icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>The mouse keys feature is enabled.  The dot in the mouse button shows which button is currently associated with the <guilabel>Mouse button click</guilabel> key.</para>
</entry>
</row>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/slowkeys.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Slow keys enabled icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>The slow keys feature is enabled.</para>
</entry>
</row>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyaltlatch.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Alt key latched icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>The sticky keys feature is
enabled and the <keycap>Alt</keycap> key is latched.</para>
</entry>
</row>
<row>
<entry valign="top">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyaltlock.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Alt key locked icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry valign="middle">
<para>The sticky keys feature is
enabled and the <keycap>Alt</keycap> key is locked.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyctrllatch.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Ctrl key latched icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Ctrl</keycap> key is latched.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyctrllock.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Ctrl key locked icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Ctrl</keycap> key is locked.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyshiftlatch.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Shift key latched icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Shift</keycap> key is latched.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickyshiftlock.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Shift key locked icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Shift</keycap> key is locked.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickywindowlatch.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Super/Windows key latched icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Super</keycap>/<keycap>Windows</keycap>
key is latched.</para>
</entry>
</row>
<row>
<entry colname="colspec0">
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="figures/stickywindowlock.png" format="PNG"/>
</imageobject>
<textobject>
<phrase>Super/Windows key locked icon</phrase>
</textobject>
</mediaobject>
</screenshot>
</entry>
<entry colname="colspec1" valign="middle">
<para>The sticky
keys feature is enabled and the <keycap>Super</keycap>/<keycap>Windows</keycap>
key is locked.</para>
</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>







</chapter>