Qtile’s command API is based on a graph of objects, where each object has a set of associated commands. The graph and object commands are used in a number of different places:
- Commands can be bound to keys in the Qtile configuration file.
- Commands can be called through qsh, the Qtile shell.
- Commands can be called from a script to interact with Qtile from Python.
If the explanation below seems a bit complex, please take a moment to explore
the API using the
qsh command shell. Command lists and detailed
documentation can be accessed from its built-in help command.
The objects in Qtile’s object graph come in seven flavours, matching the seven
basic components of the window manager:
screens, and a special
root node. Objects are
addressed by a path specification that starts at the root, and follows the
edges of the graph. This is what the graph looks like:
Each arrow can be read as “holds a reference to”. So, we can see that a
widget object holds a reference to objects of type
group. Lets start with some simple examples of how the addressing
works. Which particular objects we hold reference to depends on the context -
for instance, widgets hold a reference to the screen that they appear on, and
the bar they are attached to.
Lets look at an example, starting at the root node. The following script runs
status command on the root node, which, in this case, is represented by
the Client object:
from libqtile.command import Client c = Client() print c.status()
From the graph, we can see that the root node holds a reference to
group nodes. We can access the “info” command on the current group like
To access a specific group, regardless of whether or not it is current, we use the Python containment syntax. This command sends group “b” to screen 1:
window can be
accessed by simply leaving the key specifier out. The key specifier is
We can now drill down deeper in the graph. To access the screen currently displaying group “b”, we can do this:
Be aware, however, that group “b” might not currently be displayed. In that case, it has no associated screen, the path resolves to a non-existent node, and we get an exception:
libqtile.command.CommandError: No object screen in path 'group['b'].screen'
The graph is not a tree, since it can contain cycles. This path (redundantly) specifies the group belonging to the screen that belongs to group “b”:
The key specifier for the various object types are as follows:
|window||Integer window ID||Yes||