Ubuntu – How to drag-and-drop a file into a window that’s not in the foreground

The following script will act according to your desciption. I believe this is not the best approach for this situation, but there is not an applet with the functionality described by you that I know of.

Create a file in your home folder with the following content:

#!/bin/sh

ubuntuone_loc="/home/user/Ubuntu One/"

if [ $# -eq 0 ] ;
then 
  nautilus "$ubuntuone_loc"
else
  (
    i=0
    for file in "$@" ; 
    do
      echo $(($i * 100 / $#))
      i=$(($i+1))
      cp "$file" "$ubuntuone_loc"
    done
    echo 100
  )|zenity --progress --title="Copy files progress" --text="Copying $# files to $ubuntuone_loc..." --auto-close &

  RUNNING=0
  while [ $RUNNING -eq 0 ]
  do
    if [ -z "$(pidof zenity)" ]
    then
      kill $(pidof cp)
      RUNNING=1
    fi
  done

fi

Make sure you replace "/home/user/Ubuntu One" with your ubuntu one folder. Now create a new custom launcher, and fill in "sh /path/to/the/created/file". The new launcher should work with clicking and drag and drop.

I hope this works for you. A custom Ubuntu One applet with this sort of behaviour would be nice.

In system settings under launcher and menus you can select "Show the launcher when the pointer touches the top left of the screen"

This will now mean you will not see the launcher until you move the mouse pointer to the top left.

I hope this helps