--------------------------------------------------------------------- Command: assign-id Assign new ID to client, or fetch current ID Purpose: assigning ID to clients so server can respond to that client Compulsivity: manditory (core infrastructure) More documentation: doc/messages Reference implementation: mds-server --------------------------------------------------------------------- Command: intercept Sign up for reception of message Optional header: Stop Stop reception of messages if `yes` Optional header: Priority Signed 64-bit integer of reception priority (reversed of order) Optional header: Modifying Send message asynchronously and await modification if `yes` Optional header: Length Length of the message Message: list of headers and header–value-pairs that qualifies a message for reception, all messages qualifies if this list is empty Purpose: filter received message for clients and servers Purpose: assigned interception order for modification of messages Compulsivity: manditory (core infrastructure) More documentation: doc/messages Reference implementation: mds-server --------------------------------------------------------------------- Command: echo Echo back a message Required header: Client ID Your ID, provided by `ID assignment` in response to `Command: assign-id` Optional header: Length Length of the message Message: message to echo Purpose: debugging and testing Purpose: network heartbeat Compulsivity: recommended for network enabled servers Reference implementation: mds-echo --------------------------------------------------------------------- Command: register Register availability of a command for which you implement a service Required header: Client ID Your ID, provided by `ID assignment` in response to `Command: assign-id` Conditionally required header: Length Required if: `Action: list` Length of the message Optional header: Action Remove availability for registry if `remove`. Wait until listed commands are available if `wait`, however if a protocol becomes unavailable during this wait period it will still be counted as available for this wait action. Send a list of availability commands if `list`. Conditionally optional header: Time to live Available and optional if: `Action: wait` The maximum number of seconds to wait. Message: List of values for the header `Command` that you implement Purpose: Identify supported display server operations Purpose: Initialisation process synchronisation Compulsivity: highly recommended (infrastructure), programs may stall a bit from time to time without it, or at initialisation depending on the program's implementation Reference implementation: mds-registry --------------------------------------------------------------------- Command: reregister Request that all servers resends `Command: register` with either `Action: add` or without the `Action` header (does the same thing) Purpose: Rebuild registry created with `Command: register` if the registry server crashes Compulsivity: highly recommended (infrastructure), programs may think a protocol is not supported of the registry server crashes if you do not implement this in your server --------------------------------------------------------------------- Command: clipboard Read or manipulate a clipboard Required header: Level The clipboard level, an [1, 3] integer: 1 "primary". Text copied/pasted using the keyboard or a menu item 2 "secondary". Text copied/pasted using the rat 3 "tertiary". Non-text, it is customary for this data to begin with a line describing the data type. Required header: Action What to do with the clipboard: add) Write the message to the clipboard read) Read the clipboard clear) Clear all entries on the selected level on the clipboard set-size) Shrink/grow the clipstack get-size) Read the size of the clipstack In the reply, the server will send: Size: Used: Conditionally required header: Length Required if: `Action: add` Length of the message Conditionally required header: Size Required if: `Action: set-size` The maximum number of elements in the clipstack Conditionally required header: Client ID Your ID, provided by `ID assignment` in response to `Command: assign-id`. Required if: `Action: add` and a header starting with `Time to live: until-death` Required if: `Action: read` Required if: `Action: get-size` Conditionally optional header: Index Available and optional if: `Action: read` The index of the item in the clipstack, starting at 0 Conditionally optional header: Time to live Available and optional if: `Action: add` The number of seconds the entry should be available before it is removed by the server, or: until-death: remove entry when the client closes until-death #: remove entry when the client closes, or # seconds have elapsed forever: never remove it (default) The server will always remove the entry when: 1) it is at the bottom of the clipstack and a new entry is added to the clipstack 2) `Action: clear` is issued for the clipstack The entry will also be removed, unless `Time to live: forever`, if the server crashes or is reexecuted. It is up to the implementation to choose when the removal actually takes place. For example, the reference implementation will pop entries that have timed out when a new entry is added, the reading on the clipstack is requested or the server is reexecuted, but another implement may choose to pop entires asynchronously using another thread or an alarm an pop when when SIGARLM is received. Message: The content to add to the clipboard Purpose: Enable the user to duplicate content from one process into another process without requiring those processes to be aware of eathother to any extent Compulsivity: optional Reference implementation: mds-clipboard --------------------------------------------------------------------- Command: clipboard-info The clipboard server sends out some information about what it is doing, such as automatically removing entires Included header: Event pop) An item in the clipstack has been removed Included headers: Level: The clipboard level that has been affected Popped: The index of the item in the clipstack that has been removed Size: Configured maximum size of the clipstack Used: Number of elements currently in the clipstack crash) The clipboard has been reset because of a software crash Purpose: Enable clients to get notification about changes to the clipboard, that cannot trivially derived from `Command: clipboard` Compulsivity: optional, optional add-on to the clipboard's functionallity Reference implementation: mds-clipboard --------------------------------------------------------------------- Command: add-tray-icon Add a status icons to the status icon tray The client should keep in mind that there can be any number of trays available on the system: zero, one, two or three, ..., and that it will get a response once from every tray Required header: Client ID Your ID, provided by `ID assignment` in response to `Command: assign-id` Required header: Package The name of the package to which the program announced the icon belongs Required header: Icon ID An ID of the icon that can be used identify the icon, icon ID:s are not unique, but the combination of a package and a icon ID should be unque and can be used to ignore already added icons and hide icons that the user has been configured to be hidden Required header: Title A title describing the icon for the user, used to configured when icons should be hidden and shown among other configuration Required header: Icon The name or pathname of an icon to use together with the title Response: To: In response to: Message ID: Socket: Will send update: <`yes` if this message will be followed by `Command: tray-update`, otherwise `no`> Purpose: Enable clients to add a small icon that displays the status of programs, particularly minimised programs and services Compulsivity: optional --------------------------------------------------------------------- Command: update-tray-icon Change the status of a status icon Required header: Status hide) Hide the icon show) Show the icon active) The icon is active inactive) The icon is inactive Purpose: Enable status trays to automatically hide inactive icons Purpose: Hide icons without actually removing them Compulsivity: required if supporting `Command: add-tray-icon`, only `Status: hide` and `Status show` is required --------------------------------------------------------------------- Command: tray-update Send updates about the status tray to the status icon Required header: Socket Where the icon is embedded, used to identify the affected tray Conditionally required header: Max colour Required if: `Colour`-header is used Required if: `Alpha`-header is used The maximum colour component value, for example, if using 24-bit colour, which component will be 8-bit and the maximum value will be 255, this also applies to the alpha component Conditionally required header: Size Required if, otherwise optional: `Length`-header is used The width and height, in pixels, the icon should have Conditionally required header: Has alpha Required if: `Length`-header is used yes) The message contains an alpha channel no) The message does not contain an alpha channel Conditionally required header: Bytes Required if: `Length`-header is used The number of bytes the subpixels used, for example, 24-bit colours will have this set to 1 because each subpixel has 8 bits, 48-bit colours will have this set to 2 because each subpixel has 16 bits Conditionally optional header: Colour Available and option if: `Length`-header is not used Single blank space-separated [0, ] sRGB 3-tuple Optional header: Alpha The opacity of the tray Optional header: Length Length of the message Message: Raw binary encoding of the background image, bytes are orders: row, pixel, channel (red, green, blue, then optionally alpha), subpixel value (most significant byte first) Example image (with `Bytes: 2`, `Has alpha: no` and `Size: 3`): sRGB(x0102, 0, 0), sRGB(0, x0304, 0), sRGB(0, 0, x0506) sRGB(x0708, 0, 0), sRGB(0, x090A, 0), sRGB(0, 0, x0B0C) sRGB(x0D0E, 0, 0), sRGB(0, x0F10, 0), sRGB(0, 0, x1112) Encoding of example image (hexadecimal): 0102 0000 0000 0000 0304 0000 0000 0000 0506 0708 0000 0000 0000 090A 0000 0000 0000 0B0C 0D0E 0000 0000 0000 0F10 0000 0000 0000 1112 Purpose: Enable clients to be aware of the appearance of the tray, such as colours, transparency and background image Purpose: Enable clients to be aware of how the user wants status icons to behave Compulsivity: optional --------------------------------------------------------------------- Command: new-tray Announce the existence of a new status icon trays Purpose: Allow clients to add their status icons to status icon trays that have been added to the display after those programs have started and attempted to add their icons Compulsivity: required if supporting `Command: add-tray-icon` ---------------------------------------------------------------------