GnomeShellGenericMonitor/README.md

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Introduction
------------
This GNOME Shell Extension aims to display information to center box. Using DBUS protocol, any application can add or remove text and icons in the upper bar, right after date & clock.
Installation
------------
Create a symbolic link from your _.local_ directory and enable extension
ln -s $PWD/generic-monitor@gnome-shell-extensions/ ~/.local/share/gnome-shell/extensions/
gnome-extensions enable generic-monitor@gnome-shell-extensions
Restart GNOME
DBUS protocol
-------------
All functions read JSON formatted parameters
notify():
{
"group": "groupname",
"items": [
{
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"name" : "",
"box" : "", // Optional : left, right or center
"text" : <text_object>, // Optional
"icon" : <icon_object>, // Optional
"popup" : <popup_object>, // Optional
<signals_description>, // Optional
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}, ...
]
}
}
deleteItems():
{
"items": ["<itemName>@<groupName>", ...]
}
deleteGroups():
{
"groups": ["<groupName>", ...]
}
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openPopup():
{
"item": "<itemName>@<groupName>"
}
closePopup():
{
"item": "<itemName>@<groupName>"
}
togglePopup():
{
"item": "<itemName>@<groupName>"
}
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DBUS object
===========
<text_object> is defined as :
{
"text" : "Text to be displayed",
"style" : "CSS style to be applied", // Optional
}
<icon_object> is defined as :
{
"path" : "Icon path",
"style" : "CSS style to be applied", // Optional
}
<picture_object> is defined as :
{
"path" : "Icon path",
"width" : XXX, // Optional : Force width in pixels, can be -1 for defaut value
"height" : XXX, // Optional : Force height in pixels, can be -1 for defaut value
}
<popup_object is defuned as :
{
"items": [<text_objects> and/or <picture_objects>]
}
Signals description
===================
Signals can be :
"on-click" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-dblclick" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-rightclick" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-rightdblclick" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-enter" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-leave" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
"on-scroll" : ["signal"|"delete"|"open-popup"|"close-popup"|"toggle-popup"]
<!!> WARNING <!!> : It seems that GNOME 3.38.0 had some troubles managing on-enter/on-leave signal
Targets :
* signal : emit a signal to desktop application
* delete : Delete item
* open-popup : Open the popup if there is one
* close-popup : Close the popup if there is one
* toggle-popup : Toggle (open/close) the popup if there is one
Signal names emit when action "signal" is specified :
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* onClick
* onRightClick
* onDblClick
* onRightDblClick
* onEnter
* onLeave
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* onScrollUp
* onScrollDown
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Each signal is sent with one parameter : "<itemName>@<groupName>"
Other signals are available when extension is activated/deactivated :
* onActivate
* onDeactivate
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Example
-------
You can test it with command line :
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gdbus call --session --dest org.gnome.Shell --object-path /com/soutade/GenericMonitor --method com.soutade.GenericMonitor.notify '{"group":"new","items":[{"name":"first","on-click":"toggle-popup","text":"Hello","style":"color:green","popup":{"items":[{"picture":{"path":"/tmp/cat2.jpg"}}]}}]}'
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gdbus call --session --dest org.gnome.Shell --object-path /com/soutade/GenericMonitor --method com.soutade.GenericMonitor.deleteGroups '{"groups":["new"]}'
Python example is available
Development
-----------
After doing code update, you can test it within a nested window. In other cases you have to restart GNOME.
dbus-run-session -- gnome-shell --nested [--wayland]
To see log & errors :
journalctl /usr/bin/gnome-shell
Licence
-------
GNU GPL 3