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libratbag/doc/dbus.rst
Peter Hutterer 734977f176 Drop the SVG handling from libratbag 
The SVGs must not be part of any stable API, there is too much behavior
implied that we cannot/do not specify. So it's perfectly likely that a future
change in the SVGs or rendering libraries breaks things in some detail. But
then we cannot update the SVGs without risking breaking other clients that
rely on the current behavior.

Besides: we only have one theme, called "gnome" because a push
towards having SVGs for other themes never happened.

And that theme isn't gnome-specific, it merely looks GNOMEy. The theme is very
much piper-specific in that it requires certain elements that piper cares
about. Currently anyway, if we make this part of our API, piper cannot change
that behavior ever without breaking others.

So let's drop SVG handling completely and rely on the clients to sort it out
for themselves.

For now the SVGs are left in the tree to make it easier to copy to Piper. Once
that's done, we will remove those too.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2019-02-22 11:17:09 +01:00

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********
DBus API
********
Note: **the DBus interface is subject to change**
Interfaces:
* :ref:`manager`
* :ref:`device`
* :ref:`profile`
* :ref:`resolution`
* :ref:`button`
* :ref:`led`
Changing settings on a device is a three-step process:
#. Change the various properties to the desired value
#. Invoke :func:`org.freedesktop.ratbag1.Device.Commit() <Commit>`
#. Optional: if an error occured writing the new data to the device,
a :func:`org.freedesktop.ratbag1.Resync <Resync>` signal is emitted on the device and
all properties are updated accordingly.
The time it takes to write settings to a device varies greatly, any caller
must be prepared to receive a :func:`org.freedesktop.ratbag1.Resync
<Resync>` signal several seconds after
:func:`org.freedesktop.ratbag1.Device.Commit() <Commit>`.
Notes on the DBus API
---------------------
Values listed as enums are defined in `libratbag-enums.h
<https://github.com/libratbag/libratbag/blob/master/src/libratbag-enums.h>`_
For easier debugging, objects paths are constructed from the device. e.g.
``/org/freedesktop/ratbag/button/event5/p0/b10`` is the button interface for
button 10 on profile 0 on event5. The naming is subject to change. Do not
rely on a constructed object path in your application.
Types
.....
Types used by these interfaces:
+----------+-----------------------------------+
| Type | Description |
+==========+===================================+
| ``b`` | Bool |
+----------+-----------------------------------+
| ``o`` | Object path |
+----------+-----------------------------------+
| ``s`` | String |
+----------+-----------------------------------+
| ``u`` | Unsigned 32-bit integer |
+----------+-----------------------------------+
|``(uuu)`` | A triplet of 32-bit integers |
+----------+-----------------------------------+
| ``ao`` | Array of object paths |
+----------+-----------------------------------+
| ``as`` | Array of strings |
+----------+-----------------------------------+
| ``au`` | Array of 32-bit integers |
+----------+-----------------------------------+
| ``a(uu)``| Array of 2 32-bit integer tuples |
+----------+-----------------------------------+
For details on each type, see the `DBus Specification
<https://dbus.freedesktop.org/doc/dbus-specification.html>`_.
Flags
.....
Properties marked as **constant** do not change for the lifetime of the
object. Properties marked as **mutable** may change, and a
``org.freedesktop.DBus.Properties.PropertyChanged`` signal is sent for those
unless otherwise specified.
.. _manager:
org.freedesktop.ratbag1.Manager
-------------------------------
The **org.freedesktop.ratbag1.Manager** interface is the entry point to
interact with ratbagd.
.. attribute:: Devices
:type: ao
:flags: read-only, mutable
An array of read-only object paths referencing the available
devices. The devices implement the :ref:`device` interface.
.. _device:
org.freedesktop.ratbag1.Device
-------------------------------
The **org.freedesktop.ratbag1.Device** interface describes a single device
known to ratbagd.
.. attribute:: Id
:type: as
:flags: read-only, constant
A unique ID describing this device. This ID should not be used for presentation to
the user. This ID may be recycled when the device is removed. The
content of the ID is undefined, the client should treat it as an
opaque string.
.. attribute:: Model
:type: s
:flags: read-only, constant
An ID identifying the physical device model. This string is
guaranteed to be unique for a specific model and always identical
for devices of that model.
This is a string of one of the following formats:
- ``usb:1234:abcd:0``
- ``bluetooth:5678:ef01:0``
- ``unknown``
In the future, other formats may get added. Clients must ignore
unknown string formats.
For a string starting with `usb:`, the format is the bus type (USB)
followed by a 4-digit lowercase hex USB vendor ID, followed by a
4-digit lowercase hex USB product ID, followed by an decimal version
number of unspecified length. These four elements are separated by a
colon (``:``).
For a string starting with `bluetooth:`, the format is the bus type
(Bluetooth) followed by a 4-digit lowercase hex Bluetooth vendor ID,
followed by a 4-digit lowercase hex Bluetooth product ID, followed
by an decimal version number of unspecified length. These four
elements are separated by a colon (``:``).
For the string ``unknown``, the model of the device cannot be
determined. This is usually a bug in libratbag.
For ``DeviceId``s of type ``usb`` and ``bluetooth``, the version
number is reserved for use by libratbag. Device with identical
vendor and product IDs but different versions must be considered
different devices. For example, the version may increase when a
manufacturer re-uses USB Ids.
Vendor or product IDs of 0 are valid IDs (e.g. used used by test
devices).
.. attribute:: Name
:type: s
:flags: read-only, constant
The device's name, suitable for presentation to the user.
.. attribute:: Capabilities
:type: au
:flags: read-only, constant
The capabilities supported by this device. see
:cpp:enum:`ratbag_device_capability` in libratbag-enums.h for the
list of permissible capabilities.
.. attribute:: Profiles
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
profiles.
Provides the list of profile paths for all profiles on this device, see
:ref:`profile`
.. function:: Commit() → ()
Commits the changes to the device. This call always succeeds,
the data is written to the device asynchronously. Where an error
occurs, the :func:`Resync` signal is emitted and all properties are
updated to the current state.
.. function:: Resync()
:type: Signal
Emitted when an internal error occurs, usually on writing values to
the device after :func:`Commit()`. Upon receiving this
signal, clients are expected to resync their property values with
ratbagd.
.. _profile:
org.freedesktop.ratbag1.Profile
-------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
The zero-based index of this profile
.. attribute:: Name
:type: s
:flags: read-write, mutable
The name of this profile. If the name is the empty string, the
profile name cannot be changed.
.. attribute:: Enabled
:type: b
:flags: read-write, mutable
True if this is the profile is enabled, false otherwise.
Note that a disabled profile might not have correct bindings, so it's
a good thing to rebind everything before calling
:func:`Commit`.
.. attribute:: Resolutions
:type: ao
:flags: read-only, mutable
This property is mutable if the device supports adding and removing
resolutions.
Provides the object paths of all resolutions in this profile, see
:ref:`resolution`.
.. attribute:: Buttons
:type: ao
:flags: read-only, constant
Provides the object paths of all buttons in this profile, see
:ref:`button`.
.. attribute:: Leds
:type: ao
:flags: read-only, constant
Provides the object paths of all LEDs in this profile, see
:ref:`led`.
.. attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active profile, false otherwise.
Profiles can only be set to active, but never to not active - at least one
profile must be active at all times. This property is read-only, use the
:func:`SetActive` method to activate a profile.
.. function:: SetActive() → ()
Set this profile to be the active profile
.. _resolution:
org.freedesktop.ratbag1.Resolution
----------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the resolution
.. attribute:: Capabilities
:type: au
:flags: read-only, constant
Array of uints from the :cpp:enum:`ratbag_resolution_capability`
from libratbag.h.
.. attribute:: IsActive
:type: b
:flags: read-only, mutable
True if this is the currently active resolution, false otherwise.
Resolutions can only be set to active, but never to not
active - at least one resoultion must be active at all
times. This property is read-only, use the
:func:`SetActive` method to set a resolution as the
active resolution.
.. attribute:: IsDefault
:type: b
:flags: read-only, mutable
True if this is the currently default resolution, false
otherwise. If the device does not have the default
resolution capability, this property is always false.
Resolutions can only be set to default, but never to not
default - at least one resolution must be default at all
times. This property is read-only, use the
:func:`SetDefault` method to set a resolution as
the default resolution.
.. attribute:: Resolution
:type: uu
:flags: read-write, mutable
uint for the x and y resolution assigned to this entry,
respectively. The value for the resolution must be equal to
one of the values in :attr:`Resolutions`.
If the resolution does not support separate x/y resolutions,
x and y must be the same value.
.. attribute:: Resolutions
:type: au
:flags: read-only, constant
A list of permitted resolutions. Values in this list may be used in
the :attr:`Resolution` property. This list is always sorted
ascending, the lowest resolution is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. attribute:: ReportRate
:type: u
:flags: read-write, mutable
uint for the report rate in Hz assigned to this entry
If the resolution does not have the individual report rate
capability, changing the report rate on one resolution will
change the report rate on all resolutions.
.. attribute:: ReportRates
:type: au
:flags: read-write, constant
A list of permitted report rates. Values in this list may be used
in the :attr:`ReportRate` property. This list is always sorted
ascending, the lowest report rate is the first item in the list.
This list may be empty if the device does not support reading and/or
writing to resolutions.
.. function:: SetDefault() → ()
Set this resolution to be the default
.. function:: SetActive() → ()
Set this resolution to be the active one
.. _button:
org.freedesktop.ratbag1.Button
------------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the button
.. attribute:: ButtonMapping
:type: u
:flags: read-write, mutable
uint of the current button mapping (if mapping to button)
.. attribute:: SpecialMapping
:type: u
:flags: read-write, mutable
Enum describing the current special mapping (if mapped to special)
.. attribute:: Macro
:type: a(uu)
:flags: read-write, mutable
Array of (type, keycode), where type may be one of
:cpp:enumerator:`RATBAG_MACRO_EVENT_KEY_PRESSED` or
:cpp:enumerator:`RATBAG_MACRO_EVENT_KEY_RELEASED`.
.. attribute:: ActionType
:type: u
:flags: read-only, mutable
An enum describing the action type of the button, see
:cpp:enum:`ratbag_button_action_type` for the list of enums.
This decides which one of :attr:`ButtonMapping`,
:attr:`SpecialMapping` and :attr:`Macro` has a value.
.. attribute:: ActionTypes
:type: au
:flags: read-only, constant
Array of :cpp:enum:`ratbag_button_action_type`, possible values
for ActionType on the current device
.. function:: Disable() → ()
Disable this button
.. _led:
org.freedesktop.ratbag1.Led
---------------------------
.. attribute:: Index
:type: u
:flags: read-only, constant
Index of the LED
.. attribute:: Mode
:type: u
:flags: read-write, mutable
Enum describing the current mode, see
:cpp:enum:`ratbag_led_mode`.
.. attribute:: Modes
:type: au
:flags: read-only, constant
A list of modes supported by this LED, see
:cpp:enum:`ratbag_led_mode`.
.. attribute:: Type
:type: u
:flags: read-only, mutable
The LED type, see :cpp:enum:`ratbag_led_type`.
.. attribute:: Color
:type: (uuu)
:flags: read-write, mutable
uint triplet (RGB) of the LED's color
.. attribute:: ColorDepth
:type: u
:flags: read-only, constant
The color depth of this LED, see :cpp:enum:`ratbag_led_colordepth`.
.. attribute:: EffectDuration
:type: u
:flags: read-write, mutable
The effect duration in ms, possible values are in the range 0 - 10000
.. attribute:: Brightness
:type: u
:flags: read-write, mutable
The brightness of the LED, possible values are in the range 0 - 255
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