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xscreensaver-demo(1)	      XScreenSaver manual	  xscreensaver-demo(1)

NAME
       xscreensaver-demo  -  interactively control the background xscreensaver
       daemon

SYNOPSIS
       xscreensaver-demo [-display host:display.screen]	[-prefs] [--debug]

DESCRIPTION
       The xscreensaver-demo program is	a graphical front-end for setting  the
       parameters used by the background xscreensaver(1) daemon.  It is	essen-
       tially two things: a tool for editing the ~/.xscreensaver file;	and  a
       tool  for demoing the various graphics hacks that the xscreensaver dae-
       mon will	launch.

       The main	window consists	of a menu bar and two tabbed pages.  The first
       page  is	 for  editing the list of demos, and the second	is for editing
       various other parameters	of the screensaver.

MENU COMMANDS
       All of these commands are on either the File or Help menus:

       Blank Screen Now
	   Activates the background xscreensaver daemon, which will then run a
	   demo	 at  random.   This  is	 the same as running xscreensaver-com-
	   mand(1) with	the -activate option.

       Lock Screen Now
	   Just	like Blank Screen Now, except the screen  will	be  locked  as
	   well	 (even if it is	not configured to lock all the time.)  This is
	   the same as running xscreensaver-command(1) with the	-lock option.

       Kill Daemon
	   If the xscreensaver daemon is running  on  this  screen,  kill  it.
	   This	 is the	same as	running	xscreensaver-command(1)	with the -exit
	   option.

       Restart Daemon
	   If the xscreensaver daemon is running  on  this  screen,  kill  it.
	   Then	 launch	 it  again.  This is the same as doing ``xscreensaver-
	   command -exit'' followed by ``xscreensaver''.

	   Note	that it	 is  not  the  same  as	 doing	``xscreensaver-command
	   -restart''.

       Exit
	   Exits  the xscreensaver-demo	program	(this program) without affect-
	   ing the background xscreensaver daemon, if any.

       About...
	   Displays the	version	number of this program,	xscreensaver-demo.

       Documentation...
	   Opens up a web browser looking at the XScreenSaver web page,	 where
	   you	can  find  online  copies  of  the  xscreensaver(1),  xscreen-
	   saver-demo(1), and xscreensaver-command(1) manuals.

DISPLAY	MODES TAB
       This page contains a list of the	names of the various display modes,  a
       preview	area,  and some	fields that let	you configure screen saver be-
       havior.

       Mode
	   This	option menu controls the activation  behavior  of  the	screen
	   saver.  The options are:

	   Disable Screen Saver
	       Don't  ever  blank the screen, and don't	ever allow the monitor
	       to power	down.

	   Blank Screen	Only
	       When blanking the screen, just go black:	don't run  any	graph-
	       ics.

	   Only	One Screen Saver
	       When  blanking the screen, only ever use	one particular display
	       mode (the one selected in the list.)

	   Random Screen Saver
	       When blanking the screen, select	a  random  display  mode  from
	       among those that	are enabled and	applicable.  If	there are mul-
	       tiple monitors connected, run a different display mode on  each
	       one.  This is the default.

	   Random Same Saver
	       This  is	 just  like  Random Screen Saver, except that the same
	       randomly-chosen display mode will be run	on all	monitors,  in-
	       stead of	different ones on each.

       Demo List
	   Double-clicking  in	the  list on the left will let you try out the
	   indicated demo.  The	screen will go black, and the program will run
	   in  full-screen  mode,  just	as it would if the xscreensaver	daemon
	   had launched	it.  Clicking the mouse	again will stop	the  demo  and
	   un-blank the	screen.

	   Single-clicking  in	the list will run it in	the small preview pane
	   on the right.  (But beware: many of the display modes behave	 some-
	   what	 differently  when running in full-screen mode,	so the scaled-
	   down	view might not give an accurate	impression.)

	   When	Mode is	set to Random Screen Saver, each name in the list  has
	   a  checkbox	next to	it: this controls whether this display mode is
	   enabled.  If	it is unchecked, then that mode	will  not  be  chosen.
	   (Though  you	 can still run it explicitly by	double-clicking	on its
	   name.)

       Arrow Buttons
	   Beneath the list are	a pair of up and down arrows. Clicking on  the
	   down	 arrow	will select the	next item in the list, and then	run it
	   in full-screen mode,	just as	if you had double-clicked on it.   The
	   up  arrow  goes  the	other way.  This is just a shortcut for	trying
	   out all of the display modes	in turn.

       Blank After
	   After the user has been idle	this  long,  the  xscreensaver	daemon
	   will	blank the screen.

       Cycle After
	   After the screensaver has been running for this long, the currently
	   running graphics demo will be killed, and a new  one	 started.   If
	   this	 is  0,	then the graphics demo will never be changed: only one
	   demo	will run until the screensaver is deactivated by  user	activ-
	   ity.

	   The running saver will be restarted every this-many minutes even in
	   Only	One Screen Saver mode, since some savers tend to converge on a
	   steady state.

       Lock Screen
	   When	this is	checked, the screen will be locked when	it activates.

       Lock Screen After
	   This	 controls  the length of the ``grace period'' between when the
	   screensaver activates, and when the screen becomes locked.  For ex-
	   ample,  if  this  is	5 minutes, and Blank After is 10 minutes, then
	   after 10 minutes, the screen	would blank.  If there was user	activ-
	   ity	at  12	minutes, no password would be required to un-blank the
	   screen.  But, if there was user activity at	15  minutes  or	 later
	   (that  is, Lock Screen After	minutes	after activation) then a pass-
	   word	would be required.  The	default	is 0, meaning that if  locking
	   is  enabled,	then a password	will be	required as soon as the	screen
	   blanks.

       Preview
	   This	button,	below the small	preview	window,	runs the demo in full-
	   screen  mode	 so  that  you can try it out.	This is	the same thing
	   that	happens	when you double-click an element in the	 list.	 Click
	   the mouse to	dismiss	the full-screen	preview.

       Settings
	   This	 button	 will pop up a dialog where you	can configure settings
	   specific to the display mode	selected in the	list.

SETTINGS DIALOG
       When you	click on the Settings button on	the Display Modes tab, a  con-
       figuration  dialog  will	pop up that lets you customize settings	of the
       selected	display	mode.  Each display mode has its own custom configura-
       tion controls on	the left side.

       On  the	right  side is a paragraph or two describing the display mode.
       Below that is a Documentation button  that  will	 display  the  display
       mode's  manual  page, if	it has one, in a new window (since each	of the
       display modes is	actually a separate program, they each have their  own
       manual.)

       The  Advanced  button  reconfigures the dialog box so that you can edit
       the display mode's command line directly, instead of using the  graphi-
       cal controls.

ADVANCED TAB
       This tab	lets you change	various	settings used by the xscreensaver dae-
       mon itself, as well as some global options shared by all	of the display
       modes.

       Image Manipulation

       Some  of	 the graphics hacks manipulate images.	These settings control
       where those source images come from.  (All of these options work	by in-
       voking  the  xscreensaver-getimage(1)  program,	which is what actually
       does the	work.)

	   Grab	Desktop	Images
	       If this option is selected, then	they are allowed to manipulate
	       the desktop image, that is, a display mode might	draw a picture
	       of your desktop melting,	or being distorted in some  way.   The
	       security-paranoid might want to disable this option, because if
	       it is set, it means that	the windows on your desktop will occa-
	       sionally	 be  visible while your	screen is locked.  Others will
	       not be able to do anything, but they may	be able	to  see	 what-
	       ever you	left on	your screen.

	   Grab	Video Frames
	       If  your	system has a video capture card, selecting this	option
	       will allow the image-manipulating modes to capture a  frame  of
	       video to	operate	on.

	   Choose Random Image
	       If  this	 option	is set,	then the image-manipulating modes will
	       select a	random image file to operate on,  from	the  specified
	       source.	 That  source  may be a	local directory, which will be
	       recursively searched for	images.	 Or, it	may be the URL	of  an
	       RSS or Atom feed	(e.g., a Flickr	gallery), in which case	a ran-
	       dom image from that feed	will be	selected  instead.   The  con-
	       tents of	the feed will be cached	locally	and refreshed periodi-
	       cally as	needed.

	   If more than	one of the above image-related options	are  selected,
	   then	 one  will be chosen at	random.	 If none of them are selected,
	   then	an image of video colorbars will be used instead.

       Text Manipulation

       Some of the display modes display and manipulate	text.	The  following
       options	control	how that text is generated.  (These parameters control
       the behavior of the xscreensaver-text(1)	program, which is  what	 actu-
       ally does the work.)

	   Host	Name and Time
	       If  this	checkbox is selected, then the text used by the	screen
	       savers will be the local	host name, OS version, date, time, and
	       system load.

	   Text
	       If  this	 checkbox  is selected,	then the literal text typed in
	       the field to its	right will be used.  If	it contains  %	escape
	       sequences, they will be expanded	as per strftime(2).

	   Text	File
	       If  this	 checkbox is selected, then the	contents of the	corre-
	       sponding	file will be displayed.

	   Program
	       If this checkbox	is selected, then the given  program  will  be
	       run, repeatedly,	and its	output will be displayed.

	   URL If  this	 checkbox is selected, then the	given HTTP URL will be
	       downloaded and displayed	repeatedly.  If	the document  contains
	       HTML, RSS, or Atom, it will be converted	to plain-text first.

	       Note:  this  re-downloads  the  document	 every time the	screen
	       saver runs out of text, so it will probably be hitting that web
	       server  multiple	 times a minute.  Be careful that the owner of
	       that server doesn't consider that to be abusive.

       Power Management	Settings

       These settings control whether, and when, your monitor powers down.

	   Power Management Enabled
	       Whether the monitor should be powered down after	 a  period  of
	       inactivity.

	       If  this	 option	is grayed out, it means	your X server does not
	       support the XDPMS extension, and	so control over	the  monitor's
	       power state is not available.

	       If you're using a laptop, don't be surprised if this has	no ef-
	       fect: many laptops have monitor power-saving behavior built  in
	       at  a  very low level that is invisible to Unix and X.  On such
	       systems,	you can	typically only adjust the power-saving	delays
	       by changing settings in the BIOS	in some	hardware-specific way.

	   Standby After
	       If  Power  Management  Enabled is selected, the monitor will go
	       black after this	much idle time.	  (Graphics  demos  will  stop
	       running,	also.)

	   Suspend After
	       If  Power  Management  Enabled is selected, the monitor will go
	       into power-saving mode after this much idle time.   This	 dura-
	       tion should be greater than or equal to Standby.

	   Off After
	       If Power	Management Enabled is selected,	the monitor will fully
	       power down after	this much idle time.  This duration should  be
	       greater than or equal to	Suspend.

	   Quick Power-off in Blank Only Mode
	       If  the	display	 mode  is set to Blank Screen Only and this is
	       checked,	then the monitor will be powered off immediately  upon
	       blanking,  regardless  of  the other power-management settings.
	       In this way, the	power management idle-timers can be completely
	       disabled, but the screen	will be	powered	off when black.	 (This
	       might be	preferable on laptops.)

       Fading and Colormaps

       These options control how the screen fades to  or  from	black  when  a
       screen saver begins or ends.

	   Fade	To Black When Blanking
	       If  selected,  then when	the screensaver	activates, the current
	       contents	of the screen will fade	to  black  instead  of	simply
	       winking	out.  (Note: this doesn't work with all	X servers.)  A
	       fade will also be done when switching graphics hacks (when  the
	       Cycle After expires.)

	   Unfade From Black When Unblanking
	       The  complement	to  Fade  Colormap: if selected, then when the
	       screensaver deactivates,	the original contents  of  the	screen
	       will fade in from black instead of appearing immediately.  This
	       is only done if Fade Colormap is	also selected.

	   Fade	Duration
	       When fading or unfading are selected, this  controls  how  long
	       the fade	will take.

	   Install Colormap
	       On  8-bit  screens, whether to install a	private	colormap while
	       the screensaver is active, so that the graphics hacks  can  get
	       as  many	colors as possible.  This does nothing if you are run-
	       ning in 16-bit or better.

       There are more settings than these available, but these	are  the  most
       commonly	used ones; see the manual for xscreensaver(1) for other	param-
       eters that can be set by	editing	the ~/.xscreensaver file, or the X re-
       source database.

COMMAND-LINE OPTIONS
       xscreensaver-demo accepts the following command line options.

       -display	host:display.screen
	       The  X display to use.  The xscreensaver-demo program will open
	       its window on that display, and also control  the  xscreensaver
	       daemon that is managing that same display.

       -prefs  Start  up  with the Advanced tab	selected by default instead of
	       the Display Modes tab.

       -debug  Causes lots of diagnostics to be	printed	on stderr.

       It is important that the	xscreensaver and  xscreensaver-demo  processes
       be running on the same machine, or at least, on two machines that share
       a file system.  When xscreensaver-demo writes  a	 new  version  of  the
       ~/.xscreensaver	file,  it's  important	that the xscreensaver see that
       same file.  If the two processes	are seeing  different  ~/.xscreensaver
       files, things will malfunction.

ENVIRONMENT
       DISPLAY to get the default host and display number.

       PATH    to  find	 the sub-programs to run.  However, note that the sub-
	       programs	are actually launched by the xscreensaver daemon,  not
	       by  xscreensaver-demo  itself.	So, what matters is what $PATH
	       that the	xscreensaver program sees.

       HOME    for the directory in which to read and write the	 .xscreensaver
	       file.

       XENVIRONMENT
	       to  get	the  name of a resource	file that overrides the	global
	       resources stored	in the RESOURCE_MANAGER	property.

       HTTP_PROXY or http_proxy
	       to get the default HTTP proxy host and port.

UPGRADES
       The latest version of xscreensaver, an online version of	 this  manual,
       and a FAQ can always be found at	https://www.jwz.org/xscreensaver/

SEE ALSO
       X(1),   xscreensaver(1),	 xscreensaver-command(1),  xscreensaver-getim-
       age(1), xscreensaver-text(1)

COPYRIGHT
       Copyright (C) 1992-2015 by Jamie	Zawinski.  Permission  to  use,	 copy,
       modify,	distribute,  and  sell this software and its documentation for
       any purpose is hereby granted without  fee,  provided  that  the	 above
       copyright  notice appear	in all copies and that both that copyright no-
       tice and	this permission	notice appear in supporting documentation.  No
       representations are made	about the suitability of this software for any
       purpose.	 It is provided	"as is"	without	express	or implied warranty.

AUTHOR
       Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

       Please let me know if you find any bugs or make any improvements.

X Version 11		      5.44 (20-Mar-2020)	  xscreensaver-demo(1)

NAME | SYNOPSIS | DESCRIPTION | MENU COMMANDS | DISPLAY MODES TAB | SETTINGS DIALOG | ADVANCED TAB | COMMAND-LINE OPTIONS | ENVIRONMENT | UPGRADES | SEE ALSO | COPYRIGHT | AUTHOR

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