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MetaWaylandInput is an object that will become in charge of handling input events on their way to the Wayland socket. It keeps a stack of event handlers, and propagates events and changes across them in order to have them emit Wayland events, or change focus. Each of these event handlers has a MetaWaylandEventInterface, this is a vtable meant to replace MetaWaylandPointerGrabInterface and MetaWaylandKeyboardGrabInterface in an unified manner, with the following methods: - get_focus_surface: to return the focus surface for a device/sequence. Since several handlers will want to delegate logic on previous handlers, it is optional to chain up with meta_wayland_event_handler_chain_up_get_focus_surface(). - focus: To trigger a focus change for a device/sequence, since event handlers are daisy chained by default, it is mandatory to chain up with meta_wayland_event_handler_chain_up_focus(), either with the given surface, or passing NULL to let later handlers unset their state. - press/motion/release: Unified handlers for pointer/touch/stylus input, they chain up like event handlers do. - key: Key event handler, propagates like event handlers do. - other: Fallthrough for other events (pad, scroll, ...), propagates like event handlers do. Since there is a variety of expected behaviors, and the possibility of stacking for some of the existing Wayland "grabs", this provides the mechanism for that to happen. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3420>
Mutter
Mutter is a Wayland display server and X11 window manager and compositor library.
When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.
When used on top of Xorg it acts as a X11 window manager and compositing manager.
It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.
Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork of Clutter, a scene graph and user interface toolkit.
Mutter is used by, for example, GNOME Shell, the GNOME core user interface, and by Gala, elementary OS's window manager. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
Contributing
To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.
It can be useful to first look at the GNOME Handbook and the documentation and API references below first.
Documentation
- Coding style and conventions
- Git conventions
- Code overview
- Building and Running
- Debugging
- Monitor configuration
API Reference
- Meta: https://mutter.gnome.org/meta/
- Clutter: https://mutter.gnome.org/clutter/
- Cally: https://mutter.gnome.org/cally/
- Cogl: https://mutter.gnome.org/cogl/
- CoglPango: https://mutter.gnome.org/cogl-pango/
- Mtk: https://mutter.gnome.org/mtk/
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.