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FvwmBacker - the fvwm background changer module


Module FvwmBacker

FvwmBacker can only be invoked by fvwm. Command line invocation of the FvwmBacker module
will not work.


The FvwmBacker module provides functionality to change the background when changing
desktops. Any command can be executed to change the backgrounds. Actually, any arbitrary
command can be sent to fvwm to execute, so you could also do things such as changing
window border colors, etc.


The FvwmBacker module is the original work of Mike Finger.

Copyright 1994, Mike Finger. The author makes no guarantees or warranties of any kind
about the use of this module. Use this module at your own risk. You may freely use this
module or any portion of it for any purpose as long as the copyright is kept intact.


During initialization, FvwmBacker gets config info from fvwm's module configuration
database (see fvwm(1), section MODULE COMMANDS). Available options are discussed in a
later section.


FvwmBacker can be invoked by fvwm during initialization by inserting the line

AddToFunc StartFunction I Module FvwmBacker

in the .fvwm2rc file.

FvwmBacker can be started using a 'Module FvwmBacker' command or stopped using a
'KillModule FvwmBacker' command at any time when fvwm is running.

FvwmBacker must reside in a directory that is listed in the ModulePath option of fvwm for
it to be executed by fvwm.


The following options can be placed in the .fvwm2rc file

*FvwmBacker: Command (Desk d, Page x y) command
Specifies the command to execute when the viewport matches the arguments for the
desk d, page x coordinate and y coordinate. Any or all of these three numeric
arguments can be replaced with an asterisk (*) to indicate that any value matches,
in this case Desk or Page parts can be skipped.

If either the Desk or the Page parts are omitted, the command is not executed if
only the desk or the page is switched. If neither is given, the command is
executed only once when the module is started. This is not the same as using
asterisks for the numeric arguments: if asterisks are used, the command is always
executed when only the desk or page changes, if the corresponding part is omitted,
the command is never executed when only the desk or page changes.

If the command is -solid FvwmBacker uses the next argument as a color in the X
database and sets the background to that color without generating a system call to
xsetroot (only single word color names may be used).

If the command is colorset FvwmBacker uses the background specified in colorset n
for the given desk. Please refer to the man page of the FvwmTheme module for
details about colorsets.

Otherwise the command is sent to fvwm to execute.

*FvwmBacker: RetainPixmap
Causes FvwmBacker to retain and publish the Pixmap with which the background has
been set. This works only for the -solid or colorset commands. This is useful for
applications which want to use the root Pixmap on the background to simulate
transparency (for example, Eterm and Aterm use this method). This option should
also be used for the RootTransparent colorset option (see the FvwmTheme man page).
Note: with a colorset background this command may add a lot of memory to the X
server. For example, this adds the pixmap width times height bytes with a
TiledPixmap image, screen_width times screen_height bytes with a Pixmap image or a
C,B,D,R,S or Y Gradient and screen_width bytes with a VGradient or screen height
bytes with an HGradient.

*FvwmBacker: DoNotRetainPixmap
Cancels the effect of the previous option. This is the default.


It it possible to replace FvwmBacker's configuration at run-time, although it is not yet
possible to remove existing configuration lines. This is done by simply removing the old
configuration from withing fvwm and then read a new one. This can be done in many ways,
for example by using an fvwm function or one of the modules FvwmCommand or FvwmConsole.


DestroyModuleConfig FvwmBacker*
*FvwmBacker: Command (Desk 0) -solid black
*FvwmBacker: Command (Desk 1) -solid blue


There is continued support for the now deprecated option:

*FvwmBacker: Desk d command

It is functionally equivalent to omitting the page coordinates with *FvwmBacker:

*FvwmBacker: Command (Desk Id) command


The following are excerpts from an .fvwm2rc file which describe FvwmBacker initialization

# Set Up Backgrounds for different desktop pages (2 desks, 3x2 pages).
*FvwmBacker: Command (Page 2 *) -solid steelblue
*FvwmBacker: Command (Desk 0, Page 0 0) Exec fvwm-root $[HOME]/bg2.xpm
*FvwmBacker: Command (Desk 0, Page 0 1) -solid midnightblue
*FvwmBacker: Command (Desk 0, Page 1 *) -solid yellow
*FvwmBacker: Command (Desk 1, Page * 0) -solid navy
*FvwmBacker: Command (Desk 1, Page * 1) Colorset 5

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