/usr/share/xscreensaver/config/README is in xscreensaver-data-extra 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | XScreenSaver
a screen saver and locker for the X window system
by Jamie Zawinski
version 5.34
24-Oct-2015
http://www.jwz.org/xscreensaver/
-----------------------------------------------------------------------
This directory contains XML files that describe each of the screenhacks;
the per-hack user interface is constructed based on the things in these
files. The files are loaded at run-time by xscreensaver-demo (also
known as "the Control Center screensaver properties capplet".)
The tags and parameters used here are:
-----------------------------------------------------------------------
<screensaver name="PROGRAM-NAME" _label="PRETTY NAME">
...
</screensaver>
This encloses the whole file: all of the tags described below
are inside this one.
-----------------------------------------------------------------------
<command arg="-SWITCH"/>
specifies that "-SWITCH" always appears on the command line.
You'll most often see this with "-root".
-----------------------------------------------------------------------
<boolean id="SYMBOLIC NAME"
_label="USER VISIBLE STRING"
arg-set="-SWITCH-A"
arg-unset="-SWITCH-B"
/>
This creates a checkbox.
"id" is currently unused, but may eventually be used for
letting other widgets refer to this one.
"_label" is the string printed next to the checkbox.
"arg-set" is what to insert into the command line if the
box is checked.
"arg-unset" is what to insert into the command line if the
box is unchecked.
You will probably never specify both "arg-set" and "arg-unset",
because the setting that is the default should insert nothing
into the command line (that's what makes it the default.)
For example:
<boolean _label="foo" arg-set="-foo" />
or if "foo" is the default, and must be explicity turned off,
<boolean _label="foo" arg-unset="-no-foo" />
-----------------------------------------------------------------------
<number id="SYMBOLIC NAME"
type="slider"
arg="-SWITCH %"
_label="HEADING LABEL"
_low-label="LEFT LABEL"
_high-label="RIGHT LABEL"
low="MIN VALUE"
high="MAX VALUE"
default="DEFAULT VALUE"
[ convert="invert" ]
/>
This creates a slider.
The _label is printed above the slider. The _low-label and
_high-label are printed to the left and right, respectively.
If any of the numbers you type has a decimal point, then
the range is assumed to be a floating-point value; otherwise,
only integral values will be used. So be careful about "1"
versus "1.0".
If convert="invert" is specified, then the value that the
user tweaks goes the other way from the value the command
line expects: e.g., if the slider goes from 10-20 and the
user picks 13, the converted value goes from 20-10 (and
would be 17.) This is useful for converting between the
concepts of "delay" and "speed".
In the "arg" string, the first occurence of "%" is replaced
with the numeric value, when creating the command line.
-----------------------------------------------------------------------
<number id="SYMBOLIC NAME"
type="spinbutton"
arg="-SWITCH %"
_label="HEADING LABEL"
low="MIN VALUE"
high="MAX VALUE"
default="DEFAULT VALUE"
[ convert="invert" ]
/>
This creates a spinbox (a text field with a number in it,
and up/down arrows next to it.)
Arguments are exactly like type="slider", except that
_low-label and _high-label are not used. Also, _label
appears to the left of the box, instead of above it.
-----------------------------------------------------------------------
<select id="SYMBOLIC NAME">
<option id="SYMBOLIC NAME"
_label="USER VISIBLE STRING"
arg-set="-SWITCH"
/>
[ ... more <options> ... ]
</select>
This creates a selection popup menu.
Options should have arg-set (arg-unset is not used here.)
One of the menu items (the default) should have no arg-set.
Each arg-set should begin with the same switch: that is,
all the args in a given menu should look like:
-mode one
-mode two
-mode three
and not
-this
-that
-the other
-----------------------------------------------------------------------
<string id="SYMBOLIC NAME"
_label="USER VISIBLE STRING"
arg="-SWITCH %"
/>
This creates a text entry field.
-----------------------------------------------------------------------
<file id="SYMBOLIC NAME"
_label="USER VISIBLE STRING"
arg="-SWITCH %"
/>
This creates a file entry field (a text field with a "Browse"
button next to it.)
-----------------------------------------------------------------------
<xscreensaver-text />
This indicates that this screen saver displays text via the
"xscreensaver-text" program.
In the X11 version, this tag does nothing: the text-related
preferences are in the main Screen Saver Preferences window,
not in the per-display-mode preferences.
In the MacOS version, the text-related preferences appear
in this pane, and this tag emits those several controls.
-----------------------------------------------------------------------
<xscreensaver-image />
This indicates that this screen saver displays images via the
"xscreensaver-getimage" program.
In the X11 version, this tag does nothing: the image-loading
and screen-grabbing-related preferences are in the main
Screen Saver Preferences window, not in the per-display-mode
preferences.
In the MacOS version, the image-related preferences appear
in this pane, and this tag emits those several controls.
-----------------------------------------------------------------------
<xscreensaver-updater />
Where to position the "Check for Updates" options.
This is used on MacOS and ignored on X11.
-----------------------------------------------------------------------
<video href="URL" />
A link to a Youtube preview of this screen saver.
-----------------------------------------------------------------------
<hgroup>
[ ... <boolean>s ... ]
[ ... <number>s ... ]
[ ... <select>s ... ]
[ ... <string>s ... ]
[ ... <file>s ... ]
[ ... <vgroup>s ... ]
</hgroup>
A horizontal group of widgets/groups. No more than 4 widgets
or groups should be used in a row.
-----------------------------------------------------------------------
<vgroup>
[ ... <boolean>s ... ]
[ ... <number>s ... ]
[ ... <select>s ... ]
[ ... <string>s ... ]
[ ... <file>s ... ]
[ ... <hgroup>s ... ]
</vgroup>
A vertical group of widgets/groups. No more than 10 widgets
or groups should be used in a column.
Since the default alignment of widgets is a column, the
<vgroup> element is only of use inside an <hgroup> element.
-----------------------------------------------------------------------
<_description>
FREE TEXT
</_description>
This is the description of the hack that appears in the right
part of the window. Lines are wrapped; paragraphs are separated
by blank lines. Lines that begin with whitespace will not be
wrapped (see "munch.xml" for an example of why.)
Make sure you use "<" instead of "<", etc. Character
entities are allowed; HTML (and other markup) is not.
-----------------------------------------------------------------------
If you are DTD-minded, you may also find the included files "xss.dtd"
and "xss.xsd" useful.
-----------------------------------------------------------------------
|