xdg_shell_unstable_v5

• # xdg_shell

  xdg_shell allows clients to turn a wl_surface into a "real window" which can be dragged, resized, stacked, and moved around by the user. Everything about this interface is suited towards traditional desktop environments.

  Requests

  • #

    destroy

    destroy xdg_shell
    void xdg_shell_destroy(

    struct xdg_shell* xdg_shell

    )
    Destroy this xdg_shell object. Destroying a bound xdg_shell object while there are surfaces still alive created by this xdg_shell object instance is illegal and will result in a protocol error.
  • #

    use_unstable_version

    enable use of this unstable version
    void xdg_shell_use_unstable_version(

    struct xdg_shell* xdg_shell,

    int32_t version

    )
    Negotiate the unstable version of the interface. This mechanism is in place to ensure client and server agree on the unstable versions of the protocol that they speak or exit cleanly if they don't agree. This request will go away once the xdg-shell protocol is stable.
  • #

    get_xdg_surface

    create a shell surface from a surface
    struct xdg_surface* xdg_shell_get_xdg_surface(

    struct xdg_shell* xdg_shell,

    struct wl_surface* surface

    )
    This creates an xdg_surface for the given surface and gives it the xdg_surface role. A wl_surface can only be given an xdg_surface role once. If get_xdg_surface is called with a wl_surface that already has an active xdg_surface associated with it, or if it had any other role, an error is raised. See the documentation of xdg_surface for more details about what an xdg_surface is and how it is used.
  • #

    get_xdg_popup

    create a popup for a surface
    struct xdg_popup* xdg_shell_get_xdg_popup(

    struct xdg_shell* xdg_shell,

    struct wl_surface* surface,

    struct wl_surface* parent,

    struct wl_seat* seat, /* the wl_seat of the user event */

    uint32_t serial, /* the serial of the user event */

    int32_t x,

    int32_t y

    )
    This creates an xdg_popup for the given surface and gives it the xdg_popup role. A wl_surface can only be given an xdg_popup role once. If get_xdg_popup is called with a wl_surface that already has an active xdg_popup associated with it, or if it had any other role, an error is raised. This request must be used in response to some sort of user action like a button press, key press, or touch down event. See the documentation of xdg_popup for more details about what an xdg_popup is and how it is used.
  • #

    pong

    respond to a ping event
    void xdg_shell_pong(

    struct xdg_shell* xdg_shell,

    uint32_t serial /* serial of the ping event */

    )
    A client must respond to a ping event with a pong request or the client may be deemed unresponsive.

  Events

  • #

    ping

    check if the client is alive
    uint32_t serial /* pass this to the pong request */
    The ping event asks the client if it's still alive. Pass the serial specified in the event back to the compositor by sending a "pong" request back with the specified serial. Compositors can use this to determine if the client is still alive. It's unspecified what will happen if the client doesn't respond to the ping request, or in what timeframe. Clients should try to respond in a reasonable amount of time. A compositor is free to ping in any way it wants, but a client must always respond to any xdg_shell object it created.

  Enums

  • #

    version

    latest protocol version
    XDG_SHELL_VERSION_CURRENT /* Always the latest version */
    The 'current' member of this enum gives the version of the protocol. Implementations can compare this to the version they implement using static_assert to ensure the protocol and implementation versions match.
  • #

    error
    XDG_SHELL_ERROR_ROLE /* given wl_surface has another role */
    XDG_SHELL_ERROR_DEFUNCT_SURFACES /* xdg_shell was destroyed before children */
    XDG_SHELL_ERROR_NOT_THE_TOPMOST_POPUP /* the client tried to map or destroy a non-topmost popup */
    XDG_SHELL_ERROR_INVALID_POPUP_PARENT /* the client specified an invalid popup parent surface */

• # xdg_surface

  An interface that may be implemented by a wl_surface, for implementations that provide a desktop-style user interface. It provides requests to treat surfaces like windows, allowing to set properties like maximized, fullscreen, minimized, and to move and resize them, and associate metadata like title and app id. The client must call wl_surface.commit on the corresponding wl_surface for the xdg_surface state to take effect. Prior to committing the new state, it can set up initial configuration, such as maximizing or setting a window geometry. Even without attaching a buffer the compositor must respond to initial committed configuration, for instance sending a configure event with expected window geometry if the client maximized its surface during initialization. For a surface to be mapped by the compositor the client must have committed both an xdg_surface state and a buffer.

  Requests

  • #

    destroy

    Destroy the xdg_surface
    void xdg_surface_destroy(

    struct xdg_surface* xdg_surface

    )
    Unmap and destroy the window. The window will be effectively hidden from the user's point of view, and all state like maximization, fullscreen, and so on, will be lost.
  • #

    set_parent

    set the parent of this surface
    void xdg_surface_set_parent(

    struct xdg_surface* xdg_surface,

    struct xdg_surface* parent

    )
    Set the "parent" of this surface. This window should be stacked above a parent. The parent surface must be mapped as long as this surface is mapped. Parent windows should be set on dialogs, toolboxes, or other "auxiliary" surfaces, so that the parent is raised when the dialog is raised.
  • #

    set_title

    set surface title
    void xdg_surface_set_title(

    struct xdg_surface* xdg_surface,

    const char* title

    )
    Set a short title for the surface. This string may be used to identify the surface in a task bar, window list, or other user interface elements provided by the compositor. The string must be encoded in UTF-8.
  • #

    set_app_id

    set application ID
    void xdg_surface_set_app_id(

    struct xdg_surface* xdg_surface,

    const char* app_id

    )
    Set an application identifier for the surface. The app ID identifies the general class of applications to which the surface belongs. The compositor can use this to group multiple surfaces together, or to determine how to launch a new application. For D-Bus activatable applications, the app ID is used as the D-Bus service name. The compositor shell will try to group application surfaces together by their app ID. As a best practice, it is suggested to select app ID's that match the basename of the application's .desktop file. For example, "org.freedesktop.FooViewer" where the .desktop file is "org.freedesktop.FooViewer.desktop". See the desktop-entry specification [0] for more details on application identifiers and how they relate to well-known D-Bus names and .desktop files. [0] http://standards.freedesktop.org/desktop-entry-spec/
  • #

    show_window_menu

    show the window menu
    void xdg_surface_show_window_menu(

    struct xdg_surface* xdg_surface,

    struct wl_seat* seat, /* the wl_seat of the user event */

    uint32_t serial, /* the serial of the user event */

    int32_t x, /* the x position to pop up the window menu at */

    int32_t y /* the y position to pop up the window menu at */

    )
    Clients implementing client-side decorations might want to show a context menu when right-clicking on the decorations, giving the user a menu that they can use to maximize or minimize the window. This request asks the compositor to pop up such a window menu at the given position, relative to the local surface coordinates of the parent surface. There are no guarantees as to what menu items the window menu contains. This request must be used in response to some sort of user action like a button press, key press, or touch down event.
  • #

    move

    start an interactive move
    void xdg_surface_move(

    struct xdg_surface* xdg_surface,

    struct wl_seat* seat, /* the wl_seat of the user event */

    uint32_t serial /* the serial of the user event */

    )
    Start an interactive, user-driven move of the surface. This request must be used in response to some sort of user action like a button press, key press, or touch down event. The passed serial is used to determine the type of interactive move (touch, pointer, etc). The server may ignore move requests depending on the state of the surface (e.g. fullscreen or maximized), or if the passed serial is no longer valid. If triggered, the surface will lose the focus of the device (wl_pointer, wl_touch, etc) used for the move. It is up to the compositor to visually indicate that the move is taking place, such as updating a pointer cursor, during the move. There is no guarantee that the device focus will return when the move is completed.
  • #

    resize

    start an interactive resize
    void xdg_surface_resize(

    struct xdg_surface* xdg_surface,

    struct wl_seat* seat, /* the wl_seat of the user event */

    uint32_t serial, /* the serial of the user event */

    uint32_t edges /* which edge or corner is being dragged */

    )
    Start a user-driven, interactive resize of the surface. This request must be used in response to some sort of user action like a button press, key press, or touch down event. The passed serial is used to determine the type of interactive resize (touch, pointer, etc). The server may ignore resize requests depending on the state of the surface (e.g. fullscreen or maximized). If triggered, the client will receive configure events with the "resize" state enum value and the expected sizes. See the "resize" enum value for more details about what is required. The client must also acknowledge configure events using "ack_configure". After the resize is completed, the client will receive another "configure" event without the resize state. If triggered, the surface also will lose the focus of the device (wl_pointer, wl_touch, etc) used for the resize. It is up to the compositor to visually indicate that the resize is taking place, such as updating a pointer cursor, during the resize. There is no guarantee that the device focus will return when the resize is completed. The edges parameter specifies how the surface should be resized, and is one of the values of the resize_edge enum. The compositor may use this information to update the surface position for example when dragging the top left corner. The compositor may also use this information to adapt its behavior, e.g. choose an appropriate cursor image.
  • #

    ack_configure

    ack a configure event
    void xdg_surface_ack_configure(

    struct xdg_surface* xdg_surface,

    uint32_t serial /* the serial from the configure event */

    )
    When a configure event is received, if a client commits the surface in response to the configure event, then the client must make an ack_configure request sometime before the commit request, passing along the serial of the configure event. For instance, the compositor might use this information to move a surface to the top left only when the client has drawn itself for the maximized or fullscreen state. If the client receives multiple configure events before it can respond to one, it only has to ack the last configure event. A client is not required to commit immediately after sending an ack_configure request - it may even ack_configure several times before its next surface commit. The compositor expects that the most recently received ack_configure request at the time of a commit indicates which configure event the client is responding to.
  • #

    set_window_geometry

    set the new window geometry
    void xdg_surface_set_window_geometry(

    struct xdg_surface* xdg_surface,

    int32_t x,

    int32_t y,

    int32_t width,

    int32_t height

    )
    The window geometry of a window is its "visible bounds" from the user's perspective. Client-side decorations often have invisible portions like drop-shadows which should be ignored for the purposes of aligning, placing and constraining windows. The window geometry is double-buffered state, see wl_surface.commit. Once the window geometry of the surface is set once, it is not possible to unset it, and it will remain the same until set_window_geometry is called again, even if a new subsurface or buffer is attached. If never set, the value is the full bounds of the surface, including any subsurfaces. This updates dynamically on every commit. This unset mode is meant for extremely simple clients. If responding to a configure event, the window geometry in here must respect the sizing negotiations specified by the states in the configure event. The arguments are given in the surface local coordinate space of the wl_surface associated with this xdg_surface. The width and height must be greater than zero.
  • #

    set_maximized

    maximize the window
    void xdg_surface_set_maximized(

    struct xdg_surface* xdg_surface

    )
    Maximize the surface. After requesting that the surface should be maximized, the compositor will respond by emitting a configure event with the "maximized" state and the required window geometry. The client should then update its content, drawing it in a maximized state, i.e. without shadow or other decoration outside of the window geometry. The client must also acknowledge the configure when committing the new content (see ack_configure). It is up to the compositor to decide how and where to maximize the surface, for example which output and what region of the screen should be used. If the surface was already maximized, the compositor will still emit a configure event with the "maximized" state. Note that unrelated compositor side state changes may cause configure events to be emitted at any time, meaning trying to match this request to a specific future configure event is futile.
  • #

    unset_maximized

    unmaximize the window
    void xdg_surface_unset_maximized(

    struct xdg_surface* xdg_surface

    )
    Unmaximize the surface. After requesting that the surface should be unmaximized, the compositor will respond by emitting a configure event without the "maximized" state. If available, the compositor will include the window geometry dimensions the window had prior to being maximized in the configure request. The client must then update its content, drawing it in a regular state, i.e. potentially with shadow, etc. The client must also acknowledge the configure when committing the new content (see ack_configure). It is up to the compositor to position the surface after it was unmaximized; usually the position the surface had before maximizing, if applicable. If the surface was already not maximized, the compositor will still emit a configure event without the "maximized" state. Note that unrelated compositor side state changes may cause configure events to be emitted at any time, meaning trying to match this request to a specific future configure event is futile.
  • #

    set_fullscreen

    set the window as fullscreen on a monitor
    void xdg_surface_set_fullscreen(

    struct xdg_surface* xdg_surface,

    struct wl_output* output

    )
    Make the surface fullscreen. You can specify an output that you would prefer to be fullscreen. If this value is NULL, it's up to the compositor to choose which display will be used to map this surface. If the surface doesn't cover the whole output, the compositor will position the surface in the center of the output and compensate with black borders filling the rest of the output.
  • #

    unset_fullscreen
    void xdg_surface_unset_fullscreen(

    struct xdg_surface* xdg_surface

    )
  • #

    set_minimized

    set the window as minimized
    void xdg_surface_set_minimized(

    struct xdg_surface* xdg_surface

    )
    Request that the compositor minimize your surface. There is no way to know if the surface is currently minimized, nor is there any way to unset minimization on this surface. If you are looking to throttle redrawing when minimized, please instead use the wl_surface.frame event for this, as this will also work with live previews on windows in Alt-Tab, Expose or similar compositor features.

  Events

  • #

    configure

    suggest a surface change
    int32_t width
    int32_t height
    struct wl_array* states
    uint32_t serial
    The configure event asks the client to resize its surface or to change its state. The width and height arguments specify a hint to the window about how its surface should be resized in window geometry coordinates. See set_window_geometry. If the width or height arguments are zero, it means the client should decide its own window dimension. This may happen when the compositor need to configure the state of the surface but doesn't have any information about any previous or expected dimension. The states listed in the event specify how the width/height arguments should be interpreted, and possibly how it should be drawn. Clients should arrange their surface for the new size and states, and then send a ack_configure request with the serial sent in this configure event at some point before committing the new surface. If the client receives multiple configure events before it can respond to one, it is free to discard all but the last event it received.
  • #

    close

    surface wants to be closed
    The close event is sent by the compositor when the user wants the surface to be closed. This should be equivalent to the user clicking the close button in client-side decorations, if your application has any... This is only a request that the user intends to close your window. The client may choose to ignore this request, or show a dialog to ask the user to save their data...

  Enums

  • #

    resize_edge

    edge values for resizing
    XDG_SURFACE_RESIZE_EDGE_NONE
    XDG_SURFACE_RESIZE_EDGE_TOP
    XDG_SURFACE_RESIZE_EDGE_BOTTOM
    XDG_SURFACE_RESIZE_EDGE_LEFT
    XDG_SURFACE_RESIZE_EDGE_TOP_LEFT
    XDG_SURFACE_RESIZE_EDGE_BOTTOM_LEFT
    XDG_SURFACE_RESIZE_EDGE_RIGHT
    XDG_SURFACE_RESIZE_EDGE_TOP_RIGHT
    XDG_SURFACE_RESIZE_EDGE_BOTTOM_RIGHT
    These values are used to indicate which edge of a surface is being dragged in a resize operation.
  • #

    state

    types of state on the surface
    XDG_SURFACE_STATE_MAXIMIZED /* the surface is maximized */
    XDG_SURFACE_STATE_FULLSCREEN /* the surface is fullscreen */
    XDG_SURFACE_STATE_RESIZING /* the surface is being resized */
    XDG_SURFACE_STATE_ACTIVATED /* the surface is now activated */
    The different state values used on the surface. This is designed for state values like maximized, fullscreen. It is paired with the configure event to ensure that both the client and the compositor setting the state can be synchronized. States set in this way are double-buffered, see wl_surface.commit. Desktop environments may extend this enum by taking up a range of values and documenting the range they chose in this description. They are not required to document the values for the range that they chose. Ideally, any good extensions from a desktop environment should make its way into standardization into this enum. The current reserved ranges are: 0x0000 - 0x0FFF: xdg-shell core values, documented below. 0x1000 - 0x1FFF: GNOME 0x2000 - 0x2FFF: EFL

• # xdg_popup

  A popup surface is a short-lived, temporary surface that can be used to implement menus. It takes an explicit grab on the surface that will be dismissed when the user dismisses the popup. This can be done by the user clicking outside the surface, using the keyboard, or even locking the screen through closing the lid or a timeout. When the popup is dismissed, a popup_done event will be sent out, and at the same time the surface will be unmapped. The xdg_popup object is now inert and cannot be reactivated, so clients should destroy it. Explicitly destroying the xdg_popup object will also dismiss the popup and unmap the surface. Clients will receive events for all their surfaces during this grab (which is an "owner-events" grab in X11 parlance). This is done so that users can navigate through submenus and other "nested" popup windows without having to dismiss the topmost popup. Clients that want to dismiss the popup when another surface of their own is clicked should dismiss the popup using the destroy request. The parent surface must have either an xdg_surface or xdg_popup role. Specifying an xdg_popup for the parent means that the popups are nested, with this popup now being the topmost popup. Nested popups must be destroyed in the reverse order they were created in, e.g. the only popup you are allowed to destroy at all times is the topmost one. If there is an existing popup when creating a new popup, the parent must be the current topmost popup. A parent surface must be mapped before the new popup is mapped. When compositors choose to dismiss a popup, they will likely dismiss every nested popup as well. When a compositor dismisses popups, it will follow the same dismissing order as required from the client. The x and y arguments passed when creating the popup object specify where the top left of the popup should be placed, relative to the local surface coordinates of the parent surface. See xdg_shell.get_xdg_popup. The client must call wl_surface.commit on the corresponding wl_surface for the xdg_popup state to take effect. For a surface to be mapped by the compositor the client must have committed both the xdg_popup state and a buffer.

  Requests

  • #

    destroy

    remove xdg_popup interface
    void xdg_popup_destroy(

    struct xdg_popup* xdg_popup

    )
    This destroys the popup. Explicitly destroying the xdg_popup object will also dismiss the popup, and unmap the surface. If this xdg_popup is not the "topmost" popup, a protocol error will be sent.

  Events

  • #

    popup_done

    popup interaction is done
    The popup_done event is sent out when a popup is dismissed by the compositor. The client should destroy the xdg_popup object at this point.

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