====== Xfce ======

Ambiente desktop leggero, utilizza le librerie GTK+ 2 (come GNOME 2) e il window manager Xfwm. Vedere la pgina [[wp>Xfce|Wikipedia]].

===== User environment =====

If you want to set **aliases** or **environment variables** you have to rely on the **rc files** of your shell program; e.g. for the **bash** you can edit **$HOME/.bash_aliases** or just the **$HOME/.bashrc**. Notice that the terminal emulator is not generally executed as a login shell, so the files contained into **/etc/profile.d/** directory are not sourced (they are instead executed when logging remotely via ssh).
Some terminal emulator have their own procedure to set environment variables, e.g. the **konsole** program has the **Settings** => **Edit Current Profile...** => **General** => Environment **Edit...**.

===== Default MIME Applications =====

Debian uses the **[[https://www.freedesktop.org/wiki/Software/xdg-utils/|XDG system]]** (desktop integration utilities from freedesktop.org) to know what application is associated to a specific MIME Type. So the XFCE file manager **Thunar** (but also textual managers like the **Midnight Commander**) can be configured centrally to suit your preferences.

Let's take the **image/jpeg** MIME Type: per default it is associated to the ImageMagick viewer:

<code>
xdg-mime query default image/jpeg
display-im6.q16.desktop
</code>

Soppose we want to associate it to the **Geeqie** program instead, for the current user only (not a system-wide preference) we can do the following.

  - Verify that the **Geeqie package** installed its Desktop file **/usr/share/applications/geeqie.desktop**.
  - Create the user's applications directory **$HOME/.local/share/applications/** and copy the **geeqie.desktop** file into it.
  - Update the user's mime database configuration file with the command **update-desktop-database $HOME/.local/share/applications/**

Now you can verify that the MIME Type is correctly associated:

<code>
xdg-mime query default image/jpeg
geeqie.desktop
</code>

From now on, every XDG compliant program will use Geeqie to open an JPEG image.

===== Applet utili =====

Questi alcuni plugin utili (pacchetti Debian). In Xfce funzionano bene anche alcuni dei plugin KDE.

  * **xfce4-battery-plugin** mostra lo stato della batteria, utile per i portatili.
  * **xfce4-mixer** mixer e icona controllo volume
  * **network-manager-kde** gestione delle connessioni Ethernet, WiFi, ecc. (vedere alternativa WiCD)
  * **xfce4-xkb-plugin** selettore layout tastiera
  * **xfce4-mount-plugin** mostra volumi montati, smonta, ecc.

===== Configurazione tastiera =====

Per configurare il tasto compose, ecc. si può agire direttamente sul file **''/etc/X11/xorg.conf''** (vedere anche il paragrafo sulla [[localizzazione#caratteri_non_presenti_sulla_tastiera_kde_e_non_solo|localizzazione]]):

<file>
Section "InputClass"
    Identifier      "Generic Keyboard"
    MatchIsKeyboard "true"
    Option          "XkbOptions"  "lv3:ralt_switch, compose:rwin, eurosign:e"
EndSection
</file>

Con versioni più moderne del plugin (ad esempio xfce4-xkb-plugin 0.5.4.3 e xfce4 4.8.0.3) è comunque possibile configurare il tasto compose dalle opzioni del plugin **Settings** => **Keyboard**.

===== Shortcut problem with Konsole and other KDE applications =====

May be there is a bug with Xfce and keyboard layout. With Debian Jessie, Xfce 4.10.1, KDE apps 4:4.11.3-1, if I enable several keyboard layouts, the keyboard shortcuts stop to work (e.g. Ctrl-Shift-N for //New Window// in Konsole, Ctrl-F for //Find// in Okular, etc.).

I seems that **the order** of the layouts causes the bug. Just remove the file **''$HOME/.config/xfce4/xfconf/xfce-perchannel-xml/keyboard-layout.xml''**, or remove and re-add the layouts into the //Settings// => //Keyboard// applet.

===== Missing dialog on logout =====

It seems that the default configuration for Xfce 4.12 **Action Buttons plugin** on Debian Stretch is counterintuitive. The "Logout..." button (notice the three dots ellipsis) is supposed to open a dialog box with the various options: //Log Out//, //Restart//, //Shut Down//, //Suspend// and //Hibernate//. But the default setting simply does a logout, returning to the login manager. There is a //Show confirmation dialog// into //Action Buttons properties// (right click), but it does not solve the problem.

The program responsible of the action is ''/usr/bin/xfce4-session-logout'', provided by the **xfce4-session** package.

You must open //Settings//, //Session and Startup// and enable the option //Prompt on logout//.

===== Open With... Default Program =====

Dal file manager Thunar è possibile impostare il programma predefinito per aprire i vari tipi di file. Con il click destro, **Open With..** => **Open With Other Application...** => **Use as default for this kind of file** è possibile scegliere il programma predefinito.

Le preferenze vengono salvate nel file **$HOME/.config/mimeapps.list**. Ecco ad esempio cosa viene salvato in associazione ai file PDF:

<file>
[Default Applications]
application/pdf=okularApplication_pdf.desktop
</file>

I progammi utilizzabili sono in effetti definiti da file **.desktop** contenuti nella directory **/usr/share/applications/**, nell'esempio sopra si fa quindi riferimento al file **okularApplication_pdf.desktop**.


===== Notification Area Tooltips out of screen =====

Some applets, like the **NetworkManager Applet**, will show an icon into the **Notification Area** item that can be added to a panel. That icons may show a tooltip when the mouse is placed over. In some cases the tooltip is displayed out of the screen, this is the case using an Xfce panel aligned to the bottom edge of the screen and the NetworkManager Applet.

There are two workarounds for this problem:

  * Open the **Notification Area** properties and set the **Maximum icon size (px)** to **30** or above.
  * Open the Xfce panel preferences and enable the **Don't reserve space on borders**. Whith this setting, a maximized window will have an edge hidden by the panel itself.

See  **[[https://gitlab.xfce.org/xfce/xfce4-panel/-/issues/203|Xfce issue #203]]**.