{{howhard>4}}
__**Wallpapers on desktop:**__
====== The script: ======
I have difficulties to find a solution to get a flexible diashow as wallpapers on the desktop.
Previously I used to let "wallpapoz" work, but unfortunately, this program doesn't work with Mate or with Xfce environments.

I found this script very close to what I want to have: the diashow runs in a random and recursively way through the sub-folders.
I only added the command for the Gnome3 desktop.

<code>
#!/bin/bash

  function make_js {
       js=$(mktemp)
       cat > $js <<_EOF
      var wallpaper = "$X";
      var activity = activities()[0];
      activity.currentConfigGroup = new Array("Wallpaper", "image");
      activity.writeConfig("wallpaper", wallpaper);
      activity.writeConfig("userswallpaper", wallpaper);
      activity.reloadConfig();
_EOF
}

 function kde_wallpaper {
   make_js
   qdbus org.kde.plasma-desktop /MainApplication loadScriptInInteractiveConsole $js > /dev/null
   # sleep 2
   xdotool search --name "Desktop Shell Scripting Console -- Plasma Desktop Shell" windowactivate key ctrl+e key ctrl+w
   rm -f "$js"
   dbus-send --dest=org.kde.plasma-desktop /MainApplication org.kde.plasma-desktop.reparseConfiguration
   dbus-send --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ReloadConfig
   dbus-send --dest=org.kde.kwin /KWin org.kde.KWin.reloadConfig
   # kbuildsycoca4 2>/dev/null && kquitapp plasma-desktop 2>/dev/null ; kstart plasma-desktop > /dev/null 2>&1
 }

 function xfce_wallpaper {
   xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path -s "$X"
 }

 function lxde_wallpaper {
   pcmanfm -w "$X"
 }

 function mate_wallpaper {
   gsettings set org.mate.background picture-filename "$X"
 }

 function e17_wallpaper {
   OUTPUT_DIR=~/.e/e/backgrounds
   FileName="$X"
   edcFile=~/tmp/SlideShow.edc

   echo 'images { image: "'$FileName'" LOSSY 90; }' > $edcFile
   echo 'collections {' >> $edcFile
   echo 'group { name: "e/desktop/background";' >> $edcFile
   echo 'data { item: "style" "4"; }' >> $edcFile
   echo 'data.item: "noanimation" "1";' >> $edcFile
   echo 'max: 990 742;' >> $edcFile
   echo 'parts {' >> $edcFile
   echo 'part { name: "bg"; mouse_events: 0;' >> $edcFile
   echo 'description { state: "default" 0.0;' >> $edcFile
   echo 'aspect: 1.334231806 1.334231806; aspect_preference: NONE;' >> $edcFile
   echo 'image { normal: "'$FileName'";  scale_hint: STATIC; }' >> $edcFile
   echo '} } } } }' >> $edcFile
   edje_cc -nothreads ~/tmp/SlideShow.edc -o $OUTPUT_DIR/SlideShow.edj
   sleep 2 && rm -f ~/tmp/SlideShow.edc
   echo 'Enlightenment e17 SlideShow.edj file created'
   enlightenment_remote -desktop-bg-del 0 0 -1 -1
   enlightenment_remote -desktop-bg-add 0 0 -1 -1 $OUTPUT_DIR/SlideShow.edj;
 }

function gnome3 {
#	gsettings set org.gnome.desktop.background picture-filename "$X"
	gsettings set org.gnome.desktop.background picture-uri "$X"
}

 function usage {
   printf "%s\n%s\n\n%s\n%s\n\n%s\n\n%s" \
   "Automatically set a random image as the desktop wallpaper,"\
   "from the user's ~/Wallpaper directory."\
   "Idea from a script by Just17. Written by Paul Arnote for PCLinuxOS."\
   "Originally published in The PCLinuxOS Magazine (http://pclosmag.com), Jan. 2014 issue."\
   "Works for KDE4, Xfce, LXDE, Mate, e17 and GNOME3 desktops."\
   "Usage: $0 [arguments]"\

   printf "\n %s\t%s" \
   "-h, --help" "This help text"
   printf "\n %s\t\tSetup for the %s" \
   "--xfce"    "XFCE4 Desktop"\
   "--mate"    "Mate Desktop"\
   "--lxde"    "LXDE Desktop"\
   "--kde4"    "KDE4 Desktop"\
   "--e17"    "Enlightenment Desktop"\
   "--gnome3" "GNOME3 Desktop"
   printf "\n"
 }

DIR=$HOME/Wallpaper/

 if [ "$1" == "--help" ] || [ "$1" == "-h" ] || [ "$1" == "" ]; then
   usage
   exit
 fi

while true; do
X=`find $DIR -type f \( -name '*.jpg' -o -name '*.png' \) -print0 | shuf -n1 -z`

   # For Xfce
   if [ "$1" == "--xfce" ]; then
     xfce_wallpaper
   fi
   # For LXDE
   if [ "$1" == "--lxde" ]; then
     lxde_wallpaper
   fi
   # For Mate
   if [ "$1" == "--mate" ]; then
     mate_wallpaper
   fi
   # For KDE4
   if [ "$1" == "--kde4" ]; then
     kde_wallpaper
   fi
   # For e17
   if [ "$1" == "--e17" ]; then
     e17_wallpaper
   fi
   # For Gnome3
   if [ "$1" == "--gnome3" ]; then
     gnome3
   fi
   #
# If using Cairo-Dock add the following line
#         killall cairo-dock && sleep 0.3 && exec cairo-dock

   sleep 5m

done
exit 0

</code>

Notes:
  *the script is done to work with a pictures folder "~/Wallpaper". So create and fill this folder with pictures (or create a link "Wallpaper" pointing to your pictures folder) or modify the line "DIR=$HOME/Wallpaper" according to your folder.
  *the change of the picture is set to 5 minutes. To modify it, adapt ''sleep 5m'' according to your wishes.
  *For Xfce, I had to modify the "function xfce_wallpaper". The original command line is commented. To find out which parameter sweet to your system, run <code>
$ xfconf-query -c xfce4-desktop -l | grep "last-image$" </code> and look at the output, it will give you the path put insert between "backdrop" and "last-image"
  *the script must be run in a terminal that must stay open until the end of the session. I don't have found a solution to make it to work as a daemon. <del>Therefore, the script doesn't run if put in the autostart scripts.</del>

====== Use and integration with MATE: ======
  * create a link to the folder of the pictures <code>
ln -s /path/to/the/folder/ Wallpaper </code>
  * save this script under /path/to/the/script_diashow and give it 755 permissions
  * create a script /path/to/the/script_diashow-mate: <code>
#!/bin/bash

/path/to/the/./script_diashow --mate &
killall mate-panel
exit 0; </code> and give it 755 permissions
  * under "system"-->"preferences"-->"Personal"-->"Applications at startup" set ''/path/to/the/script_diashow-mate'' to be started automatically

====== Use and integration with GNOME3: ======
For Gnome3 the way is very simple: a [[Welcome:Fedora:Configuration Fedora24 Gnome#The desktop file|desktop file]] must only be created and via the tweaktool be selected for an autostart. <code>
[Desktop Entry]
Encoding=UTF-8
Type=Application
Name=activation du diaporama de fonds d'écran gnome3
Comment=activation du diaporama de fonds d'écran gnome3
Comment[fr]=activation du diaporama de fonds d'écran gnome3
Exec=/the/path/to/the/script_diashow --gnome3
Icon=/usr/share/icons/oxygen/base/32x32/apps/preferences-desktop-wallpaper.png
Categories=GTK;Utility;
Name[fr_FR]=activation du diaporama de fonds d'écran gnome3 </code>
====== TO BE DONE: change the picture by every changing of virtual desktop: ======

===== For MATE =====

This is only a draft in order to get another picture every time you go on another desktop (function present by "Wallpapoz").

Script to know the number of the active desktop: source: [[http://askubuntu.com/questions/272566/wmctrl-ignore-other-workspaces]]

''Ok, I came up with my own script. At least I learned some Ubuntu bash scripting ;)'' <code>

#!/bin/bash
num=`wmctrl -d | grep '\*' | cut -d' ' -f 1`
name=`wmctrl -lx | grep $1 | grep " $num " | tail -1`
host=`hostname`
out=`echo ${name##*$host}`

if [[ -n "${out}" ]]
    then
        `wmctrl -a "$out"`
    else
        $2
fi </code>

''What it does:
    gets the current desktop number
    searches current desktop for the given name (parameter one)

    then, depending on the result:
        either switches to found app
        or launches given app (parameter two)''