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A wallpaper or background (also known as a desktop wallpaper, desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, mobile communications device or other electronic device. On a computer it is usually for the desktop, while on a mobile phone it is usually the background for the ‘home’ or ‘idle’ screen. Though most devices come with a default picture, users can usually change it to custom files of their choosing.
A mobile wallpaper is a computer wallpaper sized to fit a mobile device such as a mobile phone, personal digital assistant or digital audio player. The height is often greater than or equal to the width. Wallpapers can typically be downloaded at no cost from various websites for modern phones (such as those running Android, iOS, or Windows Phone operating systems). Modern smartphones allow users to use photos from the web; or photographs captured with a phone’s camera can be set as a wallpaper.
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Chapter 8. Customizing desktop appearance
This section explains how system administrators can customize appearance of the desktop environment for different users of the system.
8.1. Customizing desktop backgrounds
As a system administrator, you can configure the default desktop background, add extra backgrounds, or add multiple backgrounds using the dconf utility.
If the users of the system are not permitted to change background from the defaults, system administrator needs to lock the settings using the locks directory. Otherwise, each user can customize the background according to their preferences.
8.1.1. Customizing the default desktop background
You can configure the default desktop background and its appearance by setting the relevant GSettings keys in the org.gnome.desktop.background schema.
For more information about GSettings , see Section 6.1, “Introduction to configuring GNOME”.
Use the following procedure to set the default background:
Procedure
Create a local database for machine-wide settings in /etc/dconf/db/local.d/00-background :
Optionally, if you want a user to not be able to change the default background, override the user’s setting in the /etc/dconf/db/local.d/locks/background file:
Update the system databases:
Users must log out and back in again before the system-wide settings take effect.
8.1.2. Adding extra backgrounds
You can make extra backgrounds available to users on your system.
Procedure
Use the org.gnome.desktop.background schemas to create a file in the xml format specifying your extra background’s appearance.
Table 8.1. Frequently used org.gnome.desktop.background schemas GSettings Keys
Determines how the image set by wallpaper_filename is rendered.
«horizontal», «vertical», and «solid»
Determines shade the background color.
Left or Top color when drawing gradients, or the solid color.
Right or Bottom color when drawing gradients, not used for solid color.
The full range of options can be found in the dconf-editor GUI or the gsettings command-line utility. For more information, see Section 6.3, “Displaying GSettings values for desktop applications”.
Store the *.xml file under the /usr/share/gnome-background-properties/ directory.
When a user clicks their name in the top right corner, chooses Settings , and in the Personal section of the table selects Background , they will see the new background available.
Example implementation of org.gnome.desktop.background GSettings keys
An example extra backgrounds file with one element
In one configuration file, you can specify multiple elements to add more backgrounds as shown in the following example with two elements, adding two different backgrounds.
An example extra backgrounds file with two elements
8.1.3. Setting the screen shield
Screen shield is the screen that quickly slides down when the system is locked. It is controlled by the org.gnome.desktop.screensaver.picture-uri GSettings key. GDM uses its own dconf profile, so you can set the default background by changing the settings in that profile.
For more information on GSettings and dconf , see Section 6.1, “Introduction to configuring GNOME”.
Procedure
Create a gdm database for machine-wide settings in /etc/dconf/db/gdm.d/01-screensaver :
Replace /opt/corp/background.jpg with the path to the image file you want to use as the screen shield. Supported formats are PNG, JPG, JPEG, and TGA. Note that the image will be scaled if necessary to fit the screen.
Update the system databases:
Users must log out and back in again before the system-wide settings take effect.
Troubleshooting
If the screen shield does not update, you can:
Make sure that you have updated the system databases by running the dconf update command as the root user.
Try restarting GDM.
8.2. Using GNOME Shell extensions to customize desktop environment
GNOME Shell extensions allow for the customization of the default GNOME Shell interface and its parts, such as window management and application launching.
Before deploying third-party GNOME Shell extensions on Red Hat Enterprise Linux, make sure to read the following document to learn about the Red Hat support policy for third-party software: How does Red Hat Global Support Services handle third-party software, drivers, and/or uncertified hardware/hypervisors?
8.2.1. Overview of GNOME Shell extensions
This section provides an overview of GNOME Shell extensions available on RHEL 8, including the name of the package providing a particular extension, and the description of what each extension does.
Table 8.2. Overview of available GNOME Shell extensions
Package name
Extension name
Description
Applications menu for GNOME Shell
Show legacy icons on top
Support for custom themes in GNOME Shell
Drive status menu for GNOME Shell
Display a window list at the bottom of the screen in GNOME Shell
Dock for the Gnome Shell by micxgx.gmail.com
Desktop icons support for the GNOME Classic experience
Disable the hot corner in GNOME Shell
System Monitor for GNOME Shell
Show a modal dialog when there are software updates
Keep windows that belong to the same process on the same workspace
Favorite launchers in GNOME Shell’s top bar
Support for keyboard selection of windows and workspaces in GNOME shell
Autom Move Windows
Assign specific workspaces to applications in GNOME Shell
Always launch a new application instance for GNOME Shell
Workspace indicator for GNOME Shell
Disable Screen Shield
Disable GNOME Shell screen shield if lock is disabled
Native window placement for GNOME Shell
Screenshot window sizer for GNOME Shell
Desktop icons support for the GNOME Classic experience
Places status menu for GNOME Shell
GNOME Classic mode session
8.2.2. Enabling machine-wide extensions
Prerequisites
To make extensions available to all users on the system, install them in the /usr/share/gnome-shell/extensions directory.
Procedure
Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions :
The enabled-extensions key specifies the enabled extensions using the extensions’ uuid ( myextension1@myname.example.com and myextension2@myname.example.com ).
Update the system databases:
Users must log out and back in again before the system-wide settings take effect.
There is currently no way to enable additional extensions for users who have already logged in. This does not apply for existing users who have installed and enabled their own GNOME extensions.
8.2.3. Locking down enabled extensions
You can prevent the user from enabling or disabling extensions by locking down the org.gnome.shell.enabled-extensions key.
Procedure
Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions :
The enabled-extensions key specifies the enabled extensions using the extensions’ uuid ( myextension1@myname.example.com and myextension2@myname.example.com ).
Override the user’s setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/extensions :
Update the system databases:
Users must log out and back in again before the system-wide settings take effect.
After locking down the org.gnome.shell.enabled-extensions , any extensions installed in
/.local/share/gnome-shell/extensions or /usr/share/gnome-shell/extensions that are not listed in the org.gnome.shell.enabled-extensions key will not be loaded by GNOME Shell, thus preventing the user from using them.
8.2.4. Setting up mandatory extensions
In GNOME Shell, you can provide a set of extensions that the user has to use.
Prerequisites
The extensions must be installed under the /usr/share/gnome-shell/extensions directory.
Procedure
Create a local database file for machine-wide settings in /etc/dconf/db/local.d/00-extensions-mandatory :
The enabled-extensions key specifies the enabled extensions using the extensions’ uuid ( myextension1@myname.example.com and myextension2@myname.example.com ).
Override the user’s setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/extensions-mandatory :
Update the system databases:
Users must log out and back in again before the system-wide settings take effect.
