// GENERATED FILE -- DO NOT EDIT
//
// Copyright © 2008-2013 Kristian Høgsberg
// Copyright © 2013      Rafael Antognolli
// Copyright © 2013      Jasper St. Pierre
// Copyright © 2010-2013 Intel Corporation
// Copyright © 2015-2017 Samsung Electronics Co., Ltd
// Copyright © 2015-2017 Red Hat Inc.
// 
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice (including the next
// paragraph) shall be included in all copies or substantial portions of the
// Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

#![allow(warnings)]
#![allow(clippy::all)]
use anyhow;
#[allow(unused_imports)]
use fuchsia_wayland_core::{Array, Enum, Fixed, NewId, NewObject};
use fuchsia_wayland_core::{ArgKind, Arg, FromArgs, IntoMessage, Message,
                            MessageGroupSpec, MessageHeader, MessageSpec, MessageType,
                            ObjectId, EncodeError, DecodeError, Interface};
pub mod xdg_wm_base {
use super::*;

/// create desktop-style surfaces
///
/// The xdg_wm_base interface is exposed as a global object enabling clients
/// to turn their wl_surfaces into windows in a desktop environment. It
/// defines the basic functionality needed for clients and the compositor to
/// create windows that can be dragged, resized, maximized, etc, as well as
/// creating transient windows such as popup menus.
#[derive(Debug)]
pub struct XdgWmBase;

impl Interface for XdgWmBase {
    const NAME: &'static str = "xdg_wm_base";
    const VERSION: u32 = 3;
    const REQUESTS: MessageGroupSpec = MessageGroupSpec(&[
        // destroy
        MessageSpec(&[
        ]),
        // create_positioner
        MessageSpec(&[
            ArgKind::NewId,
        ]),
        // get_xdg_surface
        MessageSpec(&[
            ArgKind::NewId,
            ArgKind::Object,
        ]),
        // pong
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    const EVENTS: MessageGroupSpec = MessageGroupSpec(&[
        // ping
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    type Incoming = Event;
    type Outgoing = Request;
}

#[derive(Debug)]
pub enum Request {

    /// destroy xdg_wm_base
    ///
    /// Destroy this xdg_wm_base object.
    /// 
    /// Destroying a bound xdg_wm_base object while there are surfaces
    /// still alive created by this xdg_wm_base object instance is illegal
    /// and will result in a protocol error.
    Destroy,

    /// create a positioner object
    ///
    /// Create a positioner object. A positioner object is used to position
    /// surfaces relative to some parent surface. See the interface description
    /// and xdg_surface.get_popup for details.
    CreatePositioner {
        id: NewId,
    },

    /// create a shell surface from a surface
    ///
    /// This creates an xdg_surface for the given surface. While xdg_surface
    /// itself is not a role, the corresponding surface may only be assigned
    /// a role extending xdg_surface, such as xdg_toplevel or xdg_popup.
    /// 
    /// This creates an xdg_surface for the given surface. An xdg_surface is
    /// used as basis to define a role to a given surface, such as xdg_toplevel
    /// or xdg_popup. It also manages functionality shared between xdg_surface
    /// based surface roles.
    /// 
    /// See the documentation of xdg_surface for more details about what an
    /// xdg_surface is and how it is used.
    GetXdgSurface {
        id: NewId,
        surface: ObjectId,
    },

    /// respond to a ping event
    ///
    /// A client must respond to a ping event with a pong request or
    /// the client may be deemed unresponsive. See xdg_wm_base.ping.
    Pong {
        /// serial of the ping event
        serial: u32,
    },
}

impl MessageType for Request {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Request::Destroy {
            } => {
                format!("xdg_wm_base@{:?}::destroy()", this)
            }
            Request::CreatePositioner {
                ref id,
            } => {
                format!("xdg_wm_base@{:?}::create_positioner(id: {:?})", this, id)
            }
            Request::GetXdgSurface {
                ref id,
                ref surface,
            } => {
                format!("xdg_wm_base@{:?}::get_xdg_surface(id: {:?}, surface: {:?})", this, id, surface)
            }
            Request::Pong {
                ref serial,
            } => {
                format!("xdg_wm_base@{:?}::pong(serial: {:?})", this, serial)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Request::Destroy { .. } => c"xdg_wm_base::destroy",
            Request::CreatePositioner { .. } => c"xdg_wm_base::create_positioner",
            Request::GetXdgSurface { .. } => c"xdg_wm_base::get_xdg_surface",
            Request::Pong { .. } => c"xdg_wm_base::pong",
        }
    }
}
#[derive(Debug)]
pub enum Event {

    /// check if the client is alive
    ///
    /// 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. See xdg_wm_base.pong.
    /// 
    /// 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_wm_base object it created.
    Ping {
        /// pass this to the pong request
        serial: u32,
    },
}

impl MessageType for Event {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Event::Ping {
                ref serial,
            } => {
                format!("xdg_wm_base@{:?}::ping(serial: {:?})", this, serial)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Event::Ping { .. } => c"xdg_wm_base::ping",
        }
    }
}
impl IntoMessage for Request {
    type Error = EncodeError;
    fn into_message(self, id: u32) -> Result<Message, <Self as IntoMessage>::Error> {
        let mut header = MessageHeader {
            sender: id,
            opcode: 0,
            length: 0,
        };
        let mut msg = Message::new();
        msg.write_header(&header)?;
        match self {
        Request::Destroy {
        } => {
            header.opcode = 0;
        },
        Request::CreatePositioner {
            id,
        } => {
            msg.write_arg(Arg::NewId(id))?;
            header.opcode = 1;
        },
        Request::GetXdgSurface {
            id,
            surface,
        } => {
            msg.write_arg(Arg::NewId(id))?;
            msg.write_arg(Arg::Object(surface))?;
            header.opcode = 2;
        },
        Request::Pong {
            serial,
        } => {
            msg.write_arg(Arg::Uint(serial))?;
            header.opcode = 3;
        },
        }
        header.length = msg.bytes().len() as u16;
        msg.rewind();
        msg.write_header(&header)?;
        Ok(msg)
    }
}
impl FromArgs for Event {
    fn from_args(op: u16, mut args: Vec<Arg>) -> Result<Self, anyhow::Error> {
        match op {
        0 /* ping */ => {
            let mut iter = args.into_iter();
            Ok(Event::Ping {
                serial: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_uint()?,

            })
        },
        _ => {
            Err(DecodeError::InvalidOpcode(op).into())
        },
        }
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Error {
    /// given wl_surface has another role,
    Role = 0,
    /// xdg_wm_base was destroyed before children,
    DefunctSurfaces = 1,
    /// the client tried to map or destroy a non-topmost popup,
    NotTheTopmostPopup = 2,
    /// the client specified an invalid popup parent surface,
    InvalidPopupParent = 3,
    /// the client provided an invalid surface state,
    InvalidSurfaceState = 4,
    /// the client provided an invalid positioner,
    InvalidPositioner = 5,
}

impl Error {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(Error::Role),
        1 => Some(Error::DefunctSurfaces),
        2 => Some(Error::NotTheTopmostPopup),
        3 => Some(Error::InvalidPopupParent),
        4 => Some(Error::InvalidSurfaceState),
        5 => Some(Error::InvalidPositioner),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Error {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
} // mod xdg_wm_base

pub use crate::xdg_wm_base::XdgWmBase;
pub use crate::xdg_wm_base::Request as XdgWmBaseRequest;
pub use crate::xdg_wm_base::Event as XdgWmBaseEvent;
pub mod xdg_positioner {
use super::*;

/// child surface positioner
///
/// The xdg_positioner provides a collection of rules for the placement of a
/// child surface relative to a parent surface. Rules can be defined to ensure
/// the child surface remains within the visible area's borders, and to
/// specify how the child surface changes its position, such as sliding along
/// an axis, or flipping around a rectangle. These positioner-created rules are
/// constrained by the requirement that a child surface must intersect with or
/// be at least partially adjacent to its parent surface.
/// 
/// See the various requests for details about possible rules.
/// 
/// At the time of the request, the compositor makes a copy of the rules
/// specified by the xdg_positioner. Thus, after the request is complete the
/// xdg_positioner object can be destroyed or reused; further changes to the
/// object will have no effect on previous usages.
/// 
/// For an xdg_positioner object to be considered complete, it must have a
/// non-zero size set by set_size, and a non-zero anchor rectangle set by
/// set_anchor_rect. Passing an incomplete xdg_positioner object when
/// positioning a surface raises an error.
#[derive(Debug)]
pub struct XdgPositioner;

impl Interface for XdgPositioner {
    const NAME: &'static str = "xdg_positioner";
    const VERSION: u32 = 3;
    const REQUESTS: MessageGroupSpec = MessageGroupSpec(&[
        // destroy
        MessageSpec(&[
        ]),
        // set_size
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_anchor_rect
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_anchor
        MessageSpec(&[
            ArgKind::Uint,
        ]),
        // set_gravity
        MessageSpec(&[
            ArgKind::Uint,
        ]),
        // set_constraint_adjustment
        MessageSpec(&[
            ArgKind::Uint,
        ]),
        // set_offset
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_reactive
        MessageSpec(&[
        ]),
        // set_parent_size
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_parent_configure
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    const EVENTS: MessageGroupSpec = MessageGroupSpec(&[
    ]);
    type Incoming = Event;
    type Outgoing = Request;
}

#[derive(Debug)]
pub enum Request {

    /// destroy the xdg_positioner object
    ///
    /// Notify the compositor that the xdg_positioner will no longer be used.
    Destroy,

    /// set the size of the to-be positioned rectangle
    ///
    /// Set the size of the surface that is to be positioned with the positioner
    /// object. The size is in surface-local coordinates and corresponds to the
    /// window geometry. See xdg_surface.set_window_geometry.
    /// 
    /// If a zero or negative size is set the invalid_input error is raised.
    SetSize {
        /// width of positioned rectangle
        width: i32,
        /// height of positioned rectangle
        height: i32,
    },

    /// set the anchor rectangle within the parent surface
    ///
    /// Specify the anchor rectangle within the parent surface that the child
    /// surface will be placed relative to. The rectangle is relative to the
    /// window geometry as defined by xdg_surface.set_window_geometry of the
    /// parent surface.
    /// 
    /// When the xdg_positioner object is used to position a child surface, the
    /// anchor rectangle may not extend outside the window geometry of the
    /// positioned child's parent surface.
    /// 
    /// If a negative size is set the invalid_input error is raised.
    SetAnchorRect {
        /// x position of anchor rectangle
        x: i32,
        /// y position of anchor rectangle
        y: i32,
        /// width of anchor rectangle
        width: i32,
        /// height of anchor rectangle
        height: i32,
    },

    /// set anchor rectangle anchor
    ///
    /// Defines the anchor point for the anchor rectangle. The specified anchor
    /// is used derive an anchor point that the child surface will be
    /// positioned relative to. If a corner anchor is set (e.g. 'top_left' or
    /// 'bottom_right'), the anchor point will be at the specified corner;
    /// otherwise, the derived anchor point will be centered on the specified
    /// edge, or in the center of the anchor rectangle if no edge is specified.
    SetAnchor {
        /// anchor
        anchor: Anchor,
    },

    /// set child surface gravity
    ///
    /// Defines in what direction a surface should be positioned, relative to
    /// the anchor point of the parent surface. If a corner gravity is
    /// specified (e.g. 'bottom_right' or 'top_left'), then the child surface
    /// will be placed towards the specified gravity; otherwise, the child
    /// surface will be centered over the anchor point on any axis that had no
    /// gravity specified.
    SetGravity {
        /// gravity direction
        gravity: Gravity,
    },

    /// set the adjustment to be done when constrained
    ///
    /// Specify how the window should be positioned if the originally intended
    /// position caused the surface to be constrained, meaning at least
    /// partially outside positioning boundaries set by the compositor. The
    /// adjustment is set by constructing a bitmask describing the adjustment to
    /// be made when the surface is constrained on that axis.
    /// 
    /// If no bit for one axis is set, the compositor will assume that the child
    /// surface should not change its position on that axis when constrained.
    /// 
    /// If more than one bit for one axis is set, the order of how adjustments
    /// are applied is specified in the corresponding adjustment descriptions.
    /// 
    /// The default adjustment is none.
    SetConstraintAdjustment {
        /// bit mask of constraint adjustments
        constraint_adjustment: u32,
    },

    /// set surface position offset
    ///
    /// Specify the surface position offset relative to the position of the
    /// anchor on the anchor rectangle and the anchor on the surface. For
    /// example if the anchor of the anchor rectangle is at (x, y), the surface
    /// has the gravity bottom|right, and the offset is (ox, oy), the calculated
    /// surface position will be (x + ox, y + oy). The offset position of the
    /// surface is the one used for constraint testing. See
    /// set_constraint_adjustment.
    /// 
    /// An example use case is placing a popup menu on top of a user interface
    /// element, while aligning the user interface element of the parent surface
    /// with some user interface element placed somewhere in the popup surface.
    SetOffset {
        /// surface position x offset
        x: i32,
        /// surface position y offset
        y: i32,
    },

    /// continuously reconstrain the surface
    ///
    /// When set reactive, the surface is reconstrained if the conditions used
    /// for constraining changed, e.g. the parent window moved.
    /// 
    /// If the conditions changed and the popup was reconstrained, an
    /// xdg_popup.configure event is sent with updated geometry, followed by an
    /// xdg_surface.configure event.
    SetReactive,

    ///
    /// Set the parent window geometry the compositor should use when
    /// positioning the popup. The compositor may use this information to
    /// determine the future state the popup should be constrained using. If
    /// this doesn't match the dimension of the parent the popup is eventually
    /// positioned against, the behavior is undefined.
    /// 
    /// The arguments are given in the surface-local coordinate space.
    SetParentSize {
        /// future window geometry width of parent
        parent_width: i32,
        /// future window geometry height of parent
        parent_height: i32,
    },

    /// set parent configure this is a response to
    ///
    /// Set the serial of an xdg_surface.configure event this positioner will be
    /// used in response to. The compositor may use this information together
    /// with set_parent_size to determine what future state the popup should be
    /// constrained using.
    SetParentConfigure {
        /// serial of parent configure event
        serial: u32,
    },
}

impl MessageType for Request {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Request::Destroy {
            } => {
                format!("xdg_positioner@{:?}::destroy()", this)
            }
            Request::SetSize {
                ref width,
                ref height,
            } => {
                format!("xdg_positioner@{:?}::set_size(width: {:?}, height: {:?})", this, width, height)
            }
            Request::SetAnchorRect {
                ref x,
                ref y,
                ref width,
                ref height,
            } => {
                format!("xdg_positioner@{:?}::set_anchor_rect(x: {:?}, y: {:?}, width: {:?}, height: {:?})", this, x, y, width, height)
            }
            Request::SetAnchor {
                ref anchor,
            } => {
                format!("xdg_positioner@{:?}::set_anchor(anchor: {:?})", this, anchor)
            }
            Request::SetGravity {
                ref gravity,
            } => {
                format!("xdg_positioner@{:?}::set_gravity(gravity: {:?})", this, gravity)
            }
            Request::SetConstraintAdjustment {
                ref constraint_adjustment,
            } => {
                format!("xdg_positioner@{:?}::set_constraint_adjustment(constraint_adjustment: {:?})", this, constraint_adjustment)
            }
            Request::SetOffset {
                ref x,
                ref y,
            } => {
                format!("xdg_positioner@{:?}::set_offset(x: {:?}, y: {:?})", this, x, y)
            }
            Request::SetReactive {
            } => {
                format!("xdg_positioner@{:?}::set_reactive()", this)
            }
            Request::SetParentSize {
                ref parent_width,
                ref parent_height,
            } => {
                format!("xdg_positioner@{:?}::set_parent_size(parent_width: {:?}, parent_height: {:?})", this, parent_width, parent_height)
            }
            Request::SetParentConfigure {
                ref serial,
            } => {
                format!("xdg_positioner@{:?}::set_parent_configure(serial: {:?})", this, serial)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Request::Destroy { .. } => c"xdg_positioner::destroy",
            Request::SetSize { .. } => c"xdg_positioner::set_size",
            Request::SetAnchorRect { .. } => c"xdg_positioner::set_anchor_rect",
            Request::SetAnchor { .. } => c"xdg_positioner::set_anchor",
            Request::SetGravity { .. } => c"xdg_positioner::set_gravity",
            Request::SetConstraintAdjustment { .. } => c"xdg_positioner::set_constraint_adjustment",
            Request::SetOffset { .. } => c"xdg_positioner::set_offset",
            Request::SetReactive { .. } => c"xdg_positioner::set_reactive",
            Request::SetParentSize { .. } => c"xdg_positioner::set_parent_size",
            Request::SetParentConfigure { .. } => c"xdg_positioner::set_parent_configure",
        }
    }
}
#[derive(Debug)]
pub enum Event {
}

impl MessageType for Event {
    fn log(&self, this: ObjectId) -> String {
        match *self {
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
        }
    }
}
impl IntoMessage for Request {
    type Error = EncodeError;
    fn into_message(self, id: u32) -> Result<Message, <Self as IntoMessage>::Error> {
        let mut header = MessageHeader {
            sender: id,
            opcode: 0,
            length: 0,
        };
        let mut msg = Message::new();
        msg.write_header(&header)?;
        match self {
        Request::Destroy {
        } => {
            header.opcode = 0;
        },
        Request::SetSize {
            width,
            height,
        } => {
            msg.write_arg(Arg::Int(width))?;
            msg.write_arg(Arg::Int(height))?;
            header.opcode = 1;
        },
        Request::SetAnchorRect {
            x,
            y,
            width,
            height,
        } => {
            msg.write_arg(Arg::Int(x))?;
            msg.write_arg(Arg::Int(y))?;
            msg.write_arg(Arg::Int(width))?;
            msg.write_arg(Arg::Int(height))?;
            header.opcode = 2;
        },
        Request::SetAnchor {
            anchor,
        } => {
            msg.write_arg(Arg::Uint(anchor.bits()))?;
            header.opcode = 3;
        },
        Request::SetGravity {
            gravity,
        } => {
            msg.write_arg(Arg::Uint(gravity.bits()))?;
            header.opcode = 4;
        },
        Request::SetConstraintAdjustment {
            constraint_adjustment,
        } => {
            msg.write_arg(Arg::Uint(constraint_adjustment))?;
            header.opcode = 5;
        },
        Request::SetOffset {
            x,
            y,
        } => {
            msg.write_arg(Arg::Int(x))?;
            msg.write_arg(Arg::Int(y))?;
            header.opcode = 6;
        },
        Request::SetReactive {
        } => {
            header.opcode = 7;
        },
        Request::SetParentSize {
            parent_width,
            parent_height,
        } => {
            msg.write_arg(Arg::Int(parent_width))?;
            msg.write_arg(Arg::Int(parent_height))?;
            header.opcode = 8;
        },
        Request::SetParentConfigure {
            serial,
        } => {
            msg.write_arg(Arg::Uint(serial))?;
            header.opcode = 9;
        },
        }
        header.length = msg.bytes().len() as u16;
        msg.rewind();
        msg.write_header(&header)?;
        Ok(msg)
    }
}
impl FromArgs for Event {
    fn from_args(op: u16, mut args: Vec<Arg>) -> Result<Self, anyhow::Error> {
        match op {
        _ => {
            Err(DecodeError::InvalidOpcode(op).into())
        },
        }
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Error {
    /// invalid input provided,
    InvalidInput = 0,
}

impl Error {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(Error::InvalidInput),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Error {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Anchor {
    None = 0,
    Top = 1,
    Bottom = 2,
    Left = 3,
    Right = 4,
    TopLeft = 5,
    BottomLeft = 6,
    TopRight = 7,
    BottomRight = 8,
}

impl Anchor {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(Anchor::None),
        1 => Some(Anchor::Top),
        2 => Some(Anchor::Bottom),
        3 => Some(Anchor::Left),
        4 => Some(Anchor::Right),
        5 => Some(Anchor::TopLeft),
        6 => Some(Anchor::BottomLeft),
        7 => Some(Anchor::TopRight),
        8 => Some(Anchor::BottomRight),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Anchor {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Gravity {
    None = 0,
    Top = 1,
    Bottom = 2,
    Left = 3,
    Right = 4,
    TopLeft = 5,
    BottomLeft = 6,
    TopRight = 7,
    BottomRight = 8,
}

impl Gravity {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(Gravity::None),
        1 => Some(Gravity::Top),
        2 => Some(Gravity::Bottom),
        3 => Some(Gravity::Left),
        4 => Some(Gravity::Right),
        5 => Some(Gravity::TopLeft),
        6 => Some(Gravity::BottomLeft),
        7 => Some(Gravity::TopRight),
        8 => Some(Gravity::BottomRight),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Gravity {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
::bitflags::bitflags! {

    /// constraint adjustments
    ///
    /// The constraint adjustment value define ways the compositor will adjust
    /// the position of the surface, if the unadjusted position would result
    /// in the surface being partly constrained.
    /// 
    /// Whether a surface is considered 'constrained' is left to the compositor
    /// to determine. For example, the surface may be partly outside the
    /// compositor's defined 'work area', thus necessitating the child surface's
    /// position be adjusted until it is entirely inside the work area.
    /// 
    /// The adjustments can be combined, according to a defined precedence: 1)
    /// Flip, 2) Slide, 3) Resize.
    #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
    pub struct ConstraintAdjustment: u32 {
        const None = 0;
        const SlideX = 1;
        const SlideY = 2;
        const FlipX = 4;
        const FlipY = 8;
        const ResizeX = 16;
        const ResizeY = 32;
    }
}
impl Into<Arg> for ConstraintAdjustment {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
} // mod xdg_positioner

pub use crate::xdg_positioner::XdgPositioner;
pub use crate::xdg_positioner::Request as XdgPositionerRequest;
pub use crate::xdg_positioner::Event as XdgPositionerEvent;
pub mod xdg_surface {
use super::*;

/// desktop user interface surface base interface
///
/// An interface that may be implemented by a wl_surface, for
/// implementations that provide a desktop-style user interface.
/// 
/// It provides a base set of functionality required to construct user
/// interface elements requiring management by the compositor, such as
/// toplevel windows, menus, etc. The types of functionality are split into
/// xdg_surface roles.
/// 
/// Creating an xdg_surface does not set the role for a wl_surface. In order
/// to map an xdg_surface, the client must create a role-specific object
/// using, e.g., get_toplevel, get_popup. The wl_surface for any given
/// xdg_surface can have at most one role, and may not be assigned any role
/// not based on xdg_surface.
/// 
/// A role must be assigned before any other requests are made to the
/// xdg_surface object.
/// 
/// The client must call wl_surface.commit on the corresponding wl_surface
/// for the xdg_surface state to take effect.
/// 
/// Creating an xdg_surface from a wl_surface which has a buffer attached or
/// committed is a client error, and any attempts by a client to attach or
/// manipulate a buffer prior to the first xdg_surface.configure call must
/// also be treated as errors.
/// 
/// After creating a role-specific object and setting it up, the client must
/// perform an initial commit without any buffer attached. The compositor
/// will reply with an xdg_surface.configure event. The client must
/// acknowledge it and is then allowed to attach a buffer to map the surface.
/// 
/// Mapping an xdg_surface-based role surface is defined as making it
/// possible for the surface to be shown by the compositor. Note that
/// a mapped surface is not guaranteed to be visible once it is mapped.
/// 
/// For an xdg_surface to be mapped by the compositor, the following
/// conditions must be met:
/// (1) the client has assigned an xdg_surface-based role to the surface
/// (2) the client has set and committed the xdg_surface state and the
/// role-dependent state to the surface
/// (3) the client has committed a buffer to the surface
/// 
/// A newly-unmapped surface is considered to have met condition (1) out
/// of the 3 required conditions for mapping a surface if its role surface
/// has not been destroyed.
#[derive(Debug)]
pub struct XdgSurface;

impl Interface for XdgSurface {
    const NAME: &'static str = "xdg_surface";
    const VERSION: u32 = 3;
    const REQUESTS: MessageGroupSpec = MessageGroupSpec(&[
        // destroy
        MessageSpec(&[
        ]),
        // get_toplevel
        MessageSpec(&[
            ArgKind::NewId,
        ]),
        // get_popup
        MessageSpec(&[
            ArgKind::NewId,
            ArgKind::Object,
            ArgKind::Object,
        ]),
        // set_window_geometry
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // ack_configure
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    const EVENTS: MessageGroupSpec = MessageGroupSpec(&[
        // configure
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    type Incoming = Event;
    type Outgoing = Request;
}

#[derive(Debug)]
pub enum Request {

    /// destroy the xdg_surface
    ///
    /// Destroy the xdg_surface object. An xdg_surface must only be destroyed
    /// after its role object has been destroyed.
    Destroy,

    /// assign the xdg_toplevel surface role
    ///
    /// This creates an xdg_toplevel object for the given xdg_surface and gives
    /// the associated wl_surface the xdg_toplevel role.
    /// 
    /// See the documentation of xdg_toplevel for more details about what an
    /// xdg_toplevel is and how it is used.
    GetToplevel {
        id: NewId,
    },

    /// assign the xdg_popup surface role
    ///
    /// This creates an xdg_popup object for the given xdg_surface and gives
    /// the associated wl_surface the xdg_popup role.
    /// 
    /// If null is passed as a parent, a parent surface must be specified using
    /// some other protocol, before committing the initial state.
    /// 
    /// See the documentation of xdg_popup for more details about what an
    /// xdg_popup is and how it is used.
    GetPopup {
        id: NewId,
        parent: ObjectId,
        positioner: ObjectId,
    },

    /// set the new window geometry
    ///
    /// The window geometry of a surface 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, and will be applied at the
    /// time wl_surface.commit of the corresponding wl_surface is called.
    /// 
    /// When maintaining a position, the compositor should treat the (x, y)
    /// coordinate of the window geometry as the top left corner of the window.
    /// A client changing the (x, y) window geometry coordinate should in
    /// general not alter the position of the window.
    /// 
    /// Once the window geometry of the surface is set, 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 is meant for extremely simple clients.
    /// 
    /// 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. Setting an invalid size
    /// will raise an error. When applied, the effective window geometry will be
    /// the set window geometry clamped to the bounding rectangle of the
    /// combined geometry of the surface of the xdg_surface and the associated
    /// subsurfaces.
    SetWindowGeometry {
        x: i32,
        y: i32,
        width: i32,
        height: i32,
    },

    /// ack a 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, for toplevel surfaces 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.
    /// 
    /// A client may send multiple ack_configure requests before committing, but
    /// only the last request sent before a commit indicates which configure
    /// event the client really is responding to.
    AckConfigure {
        /// the serial from the configure event
        serial: u32,
    },
}

impl MessageType for Request {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Request::Destroy {
            } => {
                format!("xdg_surface@{:?}::destroy()", this)
            }
            Request::GetToplevel {
                ref id,
            } => {
                format!("xdg_surface@{:?}::get_toplevel(id: {:?})", this, id)
            }
            Request::GetPopup {
                ref id,
                ref parent,
                ref positioner,
            } => {
                format!("xdg_surface@{:?}::get_popup(id: {:?}, parent: {:?}, positioner: {:?})", this, id, parent, positioner)
            }
            Request::SetWindowGeometry {
                ref x,
                ref y,
                ref width,
                ref height,
            } => {
                format!("xdg_surface@{:?}::set_window_geometry(x: {:?}, y: {:?}, width: {:?}, height: {:?})", this, x, y, width, height)
            }
            Request::AckConfigure {
                ref serial,
            } => {
                format!("xdg_surface@{:?}::ack_configure(serial: {:?})", this, serial)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Request::Destroy { .. } => c"xdg_surface::destroy",
            Request::GetToplevel { .. } => c"xdg_surface::get_toplevel",
            Request::GetPopup { .. } => c"xdg_surface::get_popup",
            Request::SetWindowGeometry { .. } => c"xdg_surface::set_window_geometry",
            Request::AckConfigure { .. } => c"xdg_surface::ack_configure",
        }
    }
}
#[derive(Debug)]
pub enum Event {

    /// suggest a surface change
    ///
    /// The configure event marks the end of a configure sequence. A configure
    /// sequence is a set of one or more events configuring the state of the
    /// xdg_surface, including the final xdg_surface.configure event.
    /// 
    /// Where applicable, xdg_surface surface roles will during a configure
    /// sequence extend this event as a latched state sent as events before the
    /// xdg_surface.configure event. Such events should be considered to make up
    /// a set of atomically applied configuration states, where the
    /// xdg_surface.configure commits the accumulated state.
    /// 
    /// Clients should arrange their surface for the new states, and then send
    /// an 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.
    Configure {
        /// serial of the configure event
        serial: u32,
    },
}

impl MessageType for Event {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Event::Configure {
                ref serial,
            } => {
                format!("xdg_surface@{:?}::configure(serial: {:?})", this, serial)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Event::Configure { .. } => c"xdg_surface::configure",
        }
    }
}
impl IntoMessage for Request {
    type Error = EncodeError;
    fn into_message(self, id: u32) -> Result<Message, <Self as IntoMessage>::Error> {
        let mut header = MessageHeader {
            sender: id,
            opcode: 0,
            length: 0,
        };
        let mut msg = Message::new();
        msg.write_header(&header)?;
        match self {
        Request::Destroy {
        } => {
            header.opcode = 0;
        },
        Request::GetToplevel {
            id,
        } => {
            msg.write_arg(Arg::NewId(id))?;
            header.opcode = 1;
        },
        Request::GetPopup {
            id,
            parent,
            positioner,
        } => {
            msg.write_arg(Arg::NewId(id))?;
            msg.write_arg(Arg::Object(parent))?;
            msg.write_arg(Arg::Object(positioner))?;
            header.opcode = 2;
        },
        Request::SetWindowGeometry {
            x,
            y,
            width,
            height,
        } => {
            msg.write_arg(Arg::Int(x))?;
            msg.write_arg(Arg::Int(y))?;
            msg.write_arg(Arg::Int(width))?;
            msg.write_arg(Arg::Int(height))?;
            header.opcode = 3;
        },
        Request::AckConfigure {
            serial,
        } => {
            msg.write_arg(Arg::Uint(serial))?;
            header.opcode = 4;
        },
        }
        header.length = msg.bytes().len() as u16;
        msg.rewind();
        msg.write_header(&header)?;
        Ok(msg)
    }
}
impl FromArgs for Event {
    fn from_args(op: u16, mut args: Vec<Arg>) -> Result<Self, anyhow::Error> {
        match op {
        0 /* configure */ => {
            let mut iter = args.into_iter();
            Ok(Event::Configure {
                serial: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_uint()?,

            })
        },
        _ => {
            Err(DecodeError::InvalidOpcode(op).into())
        },
        }
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Error {
    NotConstructed = 1,
    AlreadyConstructed = 2,
    UnconfiguredBuffer = 3,
}

impl Error {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        1 => Some(Error::NotConstructed),
        2 => Some(Error::AlreadyConstructed),
        3 => Some(Error::UnconfiguredBuffer),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Error {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
} // mod xdg_surface

pub use crate::xdg_surface::XdgSurface;
pub use crate::xdg_surface::Request as XdgSurfaceRequest;
pub use crate::xdg_surface::Event as XdgSurfaceEvent;
pub mod xdg_toplevel {
use super::*;

/// toplevel surface
///
/// This interface defines an xdg_surface role which allows a surface to,
/// among other things, set window-like properties such as maximize,
/// fullscreen, and minimize, set application-specific metadata like title and
/// id, and well as trigger user interactive operations such as interactive
/// resize and move.
/// 
/// Unmapping an xdg_toplevel means that the surface cannot be shown
/// by the compositor until it is explicitly mapped again.
/// All active operations (e.g., move, resize) are canceled and all
/// attributes (e.g. title, state, stacking, ...) are discarded for
/// an xdg_toplevel surface when it is unmapped. The xdg_toplevel returns to
/// the state it had right after xdg_surface.get_toplevel. The client
/// can re-map the toplevel by perfoming a commit without any buffer
/// attached, waiting for a configure event and handling it as usual (see
/// xdg_surface description).
/// 
/// Attaching a null buffer to a toplevel unmaps the surface.
#[derive(Debug)]
pub struct XdgToplevel;

impl Interface for XdgToplevel {
    const NAME: &'static str = "xdg_toplevel";
    const VERSION: u32 = 3;
    const REQUESTS: MessageGroupSpec = MessageGroupSpec(&[
        // destroy
        MessageSpec(&[
        ]),
        // set_parent
        MessageSpec(&[
            ArgKind::Object,
        ]),
        // set_title
        MessageSpec(&[
            ArgKind::String,
        ]),
        // set_app_id
        MessageSpec(&[
            ArgKind::String,
        ]),
        // show_window_menu
        MessageSpec(&[
            ArgKind::Object,
            ArgKind::Uint,
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // move
        MessageSpec(&[
            ArgKind::Object,
            ArgKind::Uint,
        ]),
        // resize
        MessageSpec(&[
            ArgKind::Object,
            ArgKind::Uint,
            ArgKind::Uint,
        ]),
        // set_max_size
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_min_size
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // set_maximized
        MessageSpec(&[
        ]),
        // unset_maximized
        MessageSpec(&[
        ]),
        // set_fullscreen
        MessageSpec(&[
            ArgKind::Object,
        ]),
        // unset_fullscreen
        MessageSpec(&[
        ]),
        // set_minimized
        MessageSpec(&[
        ]),
    ]);
    const EVENTS: MessageGroupSpec = MessageGroupSpec(&[
        // configure
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Array,
        ]),
        // close
        MessageSpec(&[
        ]),
    ]);
    type Incoming = Event;
    type Outgoing = Request;
}

#[derive(Debug)]
pub enum Request {

    /// destroy the xdg_toplevel
    ///
    /// This request destroys the role surface and unmaps the surface;
    /// see "Unmapping" behavior in interface section for details.
    Destroy,

    /// set the parent of this surface
    ///
    /// Set the "parent" of this surface. This surface should be stacked
    /// above the parent surface and all other ancestor surfaces.
    /// 
    /// Parent windows should be set on dialogs, toolboxes, or other
    /// "auxiliary" surfaces, so that the parent is raised when the dialog
    /// is raised.
    /// 
    /// Setting a null parent for a child window removes any parent-child
    /// relationship for the child. Setting a null parent for a window which
    /// currently has no parent is a no-op.
    /// 
    /// If the parent is unmapped then its children are managed as
    /// though the parent of the now-unmapped parent has become the
    /// parent of this surface. If no parent exists for the now-unmapped
    /// parent then the children are managed as though they have no
    /// parent surface.
    SetParent {
        parent: ObjectId,
    },

    /// set surface 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.
    SetTitle {
        title: String,
    },

    /// set application 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".
    /// 
    /// Like other properties, a set_app_id request can be sent after the
    /// xdg_toplevel has been mapped to update the property.
    /// 
    /// 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/
    SetAppId {
        app_id: String,
    },

    /// show the window menu
    ///
    /// 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.
    ShowWindowMenu {
        /// the wl_seat of the user event
        seat: ObjectId,
        /// the serial of the user event
        serial: u32,
        /// the x position to pop up the window menu at
        x: i32,
        /// the y position to pop up the window menu at
        y: i32,
    },

    /// start an interactive move
    ///
    /// 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.
    Move {
        /// the wl_seat of the user event
        seat: ObjectId,
        /// the serial of the user event
        serial: u32,
    },

    /// start an interactive resize
    ///
    /// 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.
    Resize {
        /// the wl_seat of the user event
        seat: ObjectId,
        /// the serial of the user event
        serial: u32,
        /// which edge or corner is being dragged
        edges: ResizeEdge,
    },

    /// set the maximum size
    ///
    /// Set a maximum size for the window.
    /// 
    /// The client can specify a maximum size so that the compositor does
    /// not try to configure the window beyond this size.
    /// 
    /// The width and height arguments are in window geometry coordinates.
    /// See xdg_surface.set_window_geometry.
    /// 
    /// Values set in this way are double-buffered. They will get applied
    /// on the next commit.
    /// 
    /// The compositor can use this information to allow or disallow
    /// different states like maximize or fullscreen and draw accurate
    /// animations.
    /// 
    /// Similarly, a tiling window manager may use this information to
    /// place and resize client windows in a more effective way.
    /// 
    /// The client should not rely on the compositor to obey the maximum
    /// size. The compositor may decide to ignore the values set by the
    /// client and request a larger size.
    /// 
    /// If never set, or a value of zero in the request, means that the
    /// client has no expected maximum size in the given dimension.
    /// As a result, a client wishing to reset the maximum size
    /// to an unspecified state can use zero for width and height in the
    /// request.
    /// 
    /// Requesting a maximum size to be smaller than the minimum size of
    /// a surface is illegal and will result in a protocol error.
    /// 
    /// The width and height must be greater than or equal to zero. Using
    /// strictly negative values for width and height will result in a
    /// protocol error.
    SetMaxSize {
        width: i32,
        height: i32,
    },

    /// set the minimum size
    ///
    /// Set a minimum size for the window.
    /// 
    /// The client can specify a minimum size so that the compositor does
    /// not try to configure the window below this size.
    /// 
    /// The width and height arguments are in window geometry coordinates.
    /// See xdg_surface.set_window_geometry.
    /// 
    /// Values set in this way are double-buffered. They will get applied
    /// on the next commit.
    /// 
    /// The compositor can use this information to allow or disallow
    /// different states like maximize or fullscreen and draw accurate
    /// animations.
    /// 
    /// Similarly, a tiling window manager may use this information to
    /// place and resize client windows in a more effective way.
    /// 
    /// The client should not rely on the compositor to obey the minimum
    /// size. The compositor may decide to ignore the values set by the
    /// client and request a smaller size.
    /// 
    /// If never set, or a value of zero in the request, means that the
    /// client has no expected minimum size in the given dimension.
    /// As a result, a client wishing to reset the minimum size
    /// to an unspecified state can use zero for width and height in the
    /// request.
    /// 
    /// Requesting a minimum size to be larger than the maximum size of
    /// a surface is illegal and will result in a protocol error.
    /// 
    /// The width and height must be greater than or equal to zero. Using
    /// strictly negative values for width and height will result in a
    /// protocol error.
    SetMinSize {
        width: i32,
        height: i32,
    },

    /// maximize the window
    ///
    /// Maximize the surface.
    /// 
    /// After requesting that the surface should be maximized, the compositor
    /// will respond by emitting a configure event. Whether this configure
    /// actually sets the window maximized is subject to compositor policies.
    /// The client must then update its content, drawing in the configured
    /// state. 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.
    /// 
    /// If the surface is in a fullscreen state, this request has no direct
    /// effect. It may alter the state the surface is returned to when
    /// unmaximized unless overridden by the compositor.
    SetMaximized,

    /// unmaximize the window
    ///
    /// Unmaximize the surface.
    /// 
    /// After requesting that the surface should be unmaximized, the compositor
    /// will respond by emitting a configure event. Whether this actually
    /// un-maximizes the window is subject to compositor policies.
    /// If available and applicable, the compositor will include the window
    /// geometry dimensions the window had prior to being maximized in the
    /// configure event. The client must then update its content, drawing it in
    /// the configured state. 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.
    /// 
    /// If the surface is in a fullscreen state, this request has no direct
    /// effect. It may alter the state the surface is returned to when
    /// unmaximized unless overridden by the compositor.
    UnsetMaximized,

    /// set the window as fullscreen on an output
    ///
    /// Make the surface fullscreen.
    /// 
    /// After requesting that the surface should be fullscreened, the
    /// compositor will respond by emitting a configure event. Whether the
    /// client is actually put into a fullscreen state is subject to compositor
    /// policies. The client must also acknowledge the configure when
    /// committing the new content (see ack_configure).
    /// 
    /// The output passed by the request indicates the client's preference as
    /// to which display it should be set fullscreen on. 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
    /// with border fill covering the rest of the output. The content of the
    /// border fill is undefined, but should be assumed to be in some way that
    /// attempts to blend into the surrounding area (e.g. solid black).
    /// 
    /// If the fullscreened surface is not opaque, the compositor must make
    /// sure that other screen content not part of the same surface tree (made
    /// up of subsurfaces, popups or similarly coupled surfaces) are not
    /// visible below the fullscreened surface.
    SetFullscreen {
        output: ObjectId,
    },

    /// unset the window as fullscreen
    ///
    /// Make the surface no longer fullscreen.
    /// 
    /// After requesting that the surface should be unfullscreened, the
    /// compositor will respond by emitting a configure event.
    /// Whether this actually removes the fullscreen state of the client is
    /// subject to compositor policies.
    /// 
    /// Making a surface unfullscreen sets states for the surface based on the following:
    /// * the state(s) it may have had before becoming fullscreen
    /// * any state(s) decided by the compositor
    /// * any state(s) requested by the client while the surface was fullscreen
    /// 
    /// The compositor may include the previous window geometry dimensions in
    /// the configure event, if applicable.
    /// 
    /// The client must also acknowledge the configure when committing the new
    /// content (see ack_configure).
    UnsetFullscreen,

    /// set the window as minimized
    ///
    /// 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.
    SetMinimized,
}

impl MessageType for Request {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Request::Destroy {
            } => {
                format!("xdg_toplevel@{:?}::destroy()", this)
            }
            Request::SetParent {
                ref parent,
            } => {
                format!("xdg_toplevel@{:?}::set_parent(parent: {:?})", this, parent)
            }
            Request::SetTitle {
                ref title,
            } => {
                format!("xdg_toplevel@{:?}::set_title(title: {:?})", this, title)
            }
            Request::SetAppId {
                ref app_id,
            } => {
                format!("xdg_toplevel@{:?}::set_app_id(app_id: {:?})", this, app_id)
            }
            Request::ShowWindowMenu {
                ref seat,
                ref serial,
                ref x,
                ref y,
            } => {
                format!("xdg_toplevel@{:?}::show_window_menu(seat: {:?}, serial: {:?}, x: {:?}, y: {:?})", this, seat, serial, x, y)
            }
            Request::Move {
                ref seat,
                ref serial,
            } => {
                format!("xdg_toplevel@{:?}::move(seat: {:?}, serial: {:?})", this, seat, serial)
            }
            Request::Resize {
                ref seat,
                ref serial,
                ref edges,
            } => {
                format!("xdg_toplevel@{:?}::resize(seat: {:?}, serial: {:?}, edges: {:?})", this, seat, serial, edges)
            }
            Request::SetMaxSize {
                ref width,
                ref height,
            } => {
                format!("xdg_toplevel@{:?}::set_max_size(width: {:?}, height: {:?})", this, width, height)
            }
            Request::SetMinSize {
                ref width,
                ref height,
            } => {
                format!("xdg_toplevel@{:?}::set_min_size(width: {:?}, height: {:?})", this, width, height)
            }
            Request::SetMaximized {
            } => {
                format!("xdg_toplevel@{:?}::set_maximized()", this)
            }
            Request::UnsetMaximized {
            } => {
                format!("xdg_toplevel@{:?}::unset_maximized()", this)
            }
            Request::SetFullscreen {
                ref output,
            } => {
                format!("xdg_toplevel@{:?}::set_fullscreen(output: {:?})", this, output)
            }
            Request::UnsetFullscreen {
            } => {
                format!("xdg_toplevel@{:?}::unset_fullscreen()", this)
            }
            Request::SetMinimized {
            } => {
                format!("xdg_toplevel@{:?}::set_minimized()", this)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Request::Destroy { .. } => c"xdg_toplevel::destroy",
            Request::SetParent { .. } => c"xdg_toplevel::set_parent",
            Request::SetTitle { .. } => c"xdg_toplevel::set_title",
            Request::SetAppId { .. } => c"xdg_toplevel::set_app_id",
            Request::ShowWindowMenu { .. } => c"xdg_toplevel::show_window_menu",
            Request::Move { .. } => c"xdg_toplevel::move",
            Request::Resize { .. } => c"xdg_toplevel::resize",
            Request::SetMaxSize { .. } => c"xdg_toplevel::set_max_size",
            Request::SetMinSize { .. } => c"xdg_toplevel::set_min_size",
            Request::SetMaximized { .. } => c"xdg_toplevel::set_maximized",
            Request::UnsetMaximized { .. } => c"xdg_toplevel::unset_maximized",
            Request::SetFullscreen { .. } => c"xdg_toplevel::set_fullscreen",
            Request::UnsetFullscreen { .. } => c"xdg_toplevel::unset_fullscreen",
            Request::SetMinimized { .. } => c"xdg_toplevel::set_minimized",
        }
    }
}
#[derive(Debug)]
pub enum Event {

    /// suggest a surface change
    ///
    /// This configure event asks the client to resize its toplevel surface or
    /// to change its state. The configured state should not be applied
    /// immediately. See xdg_surface.configure for details.
    /// 
    /// 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 needs 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 must send an ack_configure in response to this event. See
    /// xdg_surface.configure and xdg_surface.ack_configure for details.
    Configure {
        width: i32,
        height: i32,
        states: Array,
    },

    /// 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 the
    /// window. The client may choose to ignore this request, or show
    /// a dialog to ask the user to save their data, etc.
    Close,
}

impl MessageType for Event {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Event::Configure {
                ref width,
                ref height,
                ref states,
            } => {
                format!("xdg_toplevel@{:?}::configure(width: {:?}, height: {:?}, states: Array[{}])", this, width, height, states.len())
            }
            Event::Close {
            } => {
                format!("xdg_toplevel@{:?}::close()", this)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Event::Configure { .. } => c"xdg_toplevel::configure",
            Event::Close { .. } => c"xdg_toplevel::close",
        }
    }
}
impl IntoMessage for Request {
    type Error = EncodeError;
    fn into_message(self, id: u32) -> Result<Message, <Self as IntoMessage>::Error> {
        let mut header = MessageHeader {
            sender: id,
            opcode: 0,
            length: 0,
        };
        let mut msg = Message::new();
        msg.write_header(&header)?;
        match self {
        Request::Destroy {
        } => {
            header.opcode = 0;
        },
        Request::SetParent {
            parent,
        } => {
            msg.write_arg(Arg::Object(parent))?;
            header.opcode = 1;
        },
        Request::SetTitle {
            title,
        } => {
            msg.write_arg(Arg::String(title))?;
            header.opcode = 2;
        },
        Request::SetAppId {
            app_id,
        } => {
            msg.write_arg(Arg::String(app_id))?;
            header.opcode = 3;
        },
        Request::ShowWindowMenu {
            seat,
            serial,
            x,
            y,
        } => {
            msg.write_arg(Arg::Object(seat))?;
            msg.write_arg(Arg::Uint(serial))?;
            msg.write_arg(Arg::Int(x))?;
            msg.write_arg(Arg::Int(y))?;
            header.opcode = 4;
        },
        Request::Move {
            seat,
            serial,
        } => {
            msg.write_arg(Arg::Object(seat))?;
            msg.write_arg(Arg::Uint(serial))?;
            header.opcode = 5;
        },
        Request::Resize {
            seat,
            serial,
            edges,
        } => {
            msg.write_arg(Arg::Object(seat))?;
            msg.write_arg(Arg::Uint(serial))?;
            msg.write_arg(Arg::Uint(edges.bits()))?;
            header.opcode = 6;
        },
        Request::SetMaxSize {
            width,
            height,
        } => {
            msg.write_arg(Arg::Int(width))?;
            msg.write_arg(Arg::Int(height))?;
            header.opcode = 7;
        },
        Request::SetMinSize {
            width,
            height,
        } => {
            msg.write_arg(Arg::Int(width))?;
            msg.write_arg(Arg::Int(height))?;
            header.opcode = 8;
        },
        Request::SetMaximized {
        } => {
            header.opcode = 9;
        },
        Request::UnsetMaximized {
        } => {
            header.opcode = 10;
        },
        Request::SetFullscreen {
            output,
        } => {
            msg.write_arg(Arg::Object(output))?;
            header.opcode = 11;
        },
        Request::UnsetFullscreen {
        } => {
            header.opcode = 12;
        },
        Request::SetMinimized {
        } => {
            header.opcode = 13;
        },
        }
        header.length = msg.bytes().len() as u16;
        msg.rewind();
        msg.write_header(&header)?;
        Ok(msg)
    }
}
impl FromArgs for Event {
    fn from_args(op: u16, mut args: Vec<Arg>) -> Result<Self, anyhow::Error> {
        match op {
        0 /* configure */ => {
            let mut iter = args.into_iter();
            Ok(Event::Configure {
                width: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,
                height: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,
                states: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_array()?,

            })
        },
        1 /* close */ => {
            let mut iter = args.into_iter();
            Ok(Event::Close {

            })
        },
        _ => {
            Err(DecodeError::InvalidOpcode(op).into())
        },
        }
    }
}

/// edge values for resizing
///
/// These values are used to indicate which edge of a surface
/// is being dragged in a resize operation.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum ResizeEdge {
    None = 0,
    Top = 1,
    Bottom = 2,
    Left = 4,
    TopLeft = 5,
    BottomLeft = 6,
    Right = 8,
    TopRight = 9,
    BottomRight = 10,
}

impl ResizeEdge {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(ResizeEdge::None),
        1 => Some(ResizeEdge::Top),
        2 => Some(ResizeEdge::Bottom),
        4 => Some(ResizeEdge::Left),
        5 => Some(ResizeEdge::TopLeft),
        6 => Some(ResizeEdge::BottomLeft),
        8 => Some(ResizeEdge::Right),
        9 => Some(ResizeEdge::TopRight),
        10 => Some(ResizeEdge::BottomRight),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for ResizeEdge {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}

/// types of state on the surface
///
/// 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. They will get applied on
/// the next commit.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum State {
    /// the surface is maximized,
    Maximized = 1,
    /// the surface is fullscreen,
    Fullscreen = 2,
    /// the surface is being resized,
    Resizing = 3,
    /// the surface is now activated,
    Activated = 4,
    TiledLeft = 5,
    TiledRight = 6,
    TiledTop = 7,
    TiledBottom = 8,
}

impl State {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        1 => Some(State::Maximized),
        2 => Some(State::Fullscreen),
        3 => Some(State::Resizing),
        4 => Some(State::Activated),
        5 => Some(State::TiledLeft),
        6 => Some(State::TiledRight),
        7 => Some(State::TiledTop),
        8 => Some(State::TiledBottom),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for State {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
} // mod xdg_toplevel

pub use crate::xdg_toplevel::XdgToplevel;
pub use crate::xdg_toplevel::Request as XdgToplevelRequest;
pub use crate::xdg_toplevel::Event as XdgToplevelEvent;
pub mod xdg_popup {
use super::*;

/// short-lived, popup surfaces for menus
///
/// A popup surface is a short-lived, temporary surface. It can be used to
/// implement for example menus, popovers, tooltips and other similar user
/// interface concepts.
/// 
/// A popup can be made to take an explicit grab. See xdg_popup.grab for
/// details.
/// 
/// When the popup is dismissed, a popup_done event will be sent out, and at
/// the same time the surface will be unmapped. See the xdg_popup.popup_done
/// event for details.
/// 
/// Explicitly destroying the xdg_popup object will also dismiss the popup and
/// unmap the surface. Clients that want to dismiss the popup when another
/// surface of their own is clicked should dismiss the popup using the destroy
/// request.
/// 
/// A newly created xdg_popup will be stacked on top of all previously created
/// xdg_popup surfaces associated with the same xdg_toplevel.
/// 
/// The parent of an xdg_popup must be mapped (see the xdg_surface
/// description) before the xdg_popup itself.
/// 
/// The client must call wl_surface.commit on the corresponding wl_surface
/// for the xdg_popup state to take effect.
#[derive(Debug)]
pub struct XdgPopup;

impl Interface for XdgPopup {
    const NAME: &'static str = "xdg_popup";
    const VERSION: u32 = 3;
    const REQUESTS: MessageGroupSpec = MessageGroupSpec(&[
        // destroy
        MessageSpec(&[
        ]),
        // grab
        MessageSpec(&[
            ArgKind::Object,
            ArgKind::Uint,
        ]),
        // reposition
        MessageSpec(&[
            ArgKind::Object,
            ArgKind::Uint,
        ]),
    ]);
    const EVENTS: MessageGroupSpec = MessageGroupSpec(&[
        // configure
        MessageSpec(&[
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
            ArgKind::Int,
        ]),
        // popup_done
        MessageSpec(&[
        ]),
        // repositioned
        MessageSpec(&[
            ArgKind::Uint,
        ]),
    ]);
    type Incoming = Event;
    type Outgoing = Request;
}

#[derive(Debug)]
pub enum Request {

    /// remove xdg_popup interface
    ///
    /// 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.
    Destroy,

    /// make the popup take an explicit grab
    ///
    /// This request makes the created popup take an explicit grab. An explicit
    /// grab will be dismissed when the user dismisses the popup, or when the
    /// client destroys the xdg_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.
    /// 
    /// If the compositor denies the grab, the popup will be immediately
    /// dismissed.
    /// 
    /// This request must be used in response to some sort of user action like a
    /// button press, key press, or touch down event. The serial number of the
    /// event should be passed as 'serial'.
    /// 
    /// The parent of a grabbing popup must either be an xdg_toplevel surface or
    /// another xdg_popup with an explicit grab. If the parent is another
    /// xdg_popup it 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.
    /// 
    /// When compositors choose to dismiss a popup, they may dismiss every
    /// nested grabbing popup as well. When a compositor dismisses popups, it
    /// will follow the same dismissing order as required from the client.
    /// 
    /// The parent of a grabbing popup must either be another xdg_popup with an
    /// active explicit grab, or an xdg_popup or xdg_toplevel, if there are no
    /// explicit grabs already taken.
    /// 
    /// If the topmost grabbing popup is destroyed, the grab will be returned to
    /// the parent of the popup, if that parent previously had an explicit grab.
    /// 
    /// If the parent is a grabbing popup which has already been dismissed, this
    /// popup will be immediately dismissed. If the parent is a popup that did
    /// not take an explicit grab, an error will be raised.
    /// 
    /// During a popup grab, the client owning the grab will receive pointer
    /// and touch events for all their surfaces as normal (similar to an
    /// "owner-events" grab in X11 parlance), while the top most grabbing popup
    /// will always have keyboard focus.
    Grab {
        /// the wl_seat of the user event
        seat: ObjectId,
        /// the serial of the user event
        serial: u32,
    },

    /// recalculate the popup's location
    ///
    /// Reposition an already-mapped popup. The popup will be placed given the
    /// details in the passed xdg_positioner object, and a
    /// xdg_popup.repositioned followed by xdg_popup.configure and
    /// xdg_surface.configure will be emitted in response. Any parameters set
    /// by the previous positioner will be discarded.
    /// 
    /// The passed token will be sent in the corresponding
    /// xdg_popup.repositioned event. The new popup position will not take
    /// effect until the corresponding configure event is acknowledged by the
    /// client. See xdg_popup.repositioned for details. The token itself is
    /// opaque, and has no other special meaning.
    /// 
    /// If multiple reposition requests are sent, the compositor may skip all
    /// but the last one.
    /// 
    /// If the popup is repositioned in response to a configure event for its
    /// parent, the client should send an xdg_positioner.set_parent_configure
    /// and possibly an xdg_positioner.set_parent_size request to allow the
    /// compositor to properly constrain the popup.
    /// 
    /// If the popup is repositioned together with a parent that is being
    /// resized, but not in response to a configure event, the client should
    /// send an xdg_positioner.set_parent_size request.
    Reposition {
        positioner: ObjectId,
        /// reposition request token
        token: u32,
    },
}

impl MessageType for Request {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Request::Destroy {
            } => {
                format!("xdg_popup@{:?}::destroy()", this)
            }
            Request::Grab {
                ref seat,
                ref serial,
            } => {
                format!("xdg_popup@{:?}::grab(seat: {:?}, serial: {:?})", this, seat, serial)
            }
            Request::Reposition {
                ref positioner,
                ref token,
            } => {
                format!("xdg_popup@{:?}::reposition(positioner: {:?}, token: {:?})", this, positioner, token)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Request::Destroy { .. } => c"xdg_popup::destroy",
            Request::Grab { .. } => c"xdg_popup::grab",
            Request::Reposition { .. } => c"xdg_popup::reposition",
        }
    }
}
#[derive(Debug)]
pub enum Event {

    /// configure the popup surface
    ///
    /// This event asks the popup surface to configure itself given the
    /// configuration. The configured state should not be applied immediately.
    /// See xdg_surface.configure for details.
    /// 
    /// The x and y arguments represent the position the popup was placed at
    /// given the xdg_positioner rule, relative to the upper left corner of the
    /// window geometry of the parent surface.
    /// 
    /// For version 2 or older, the configure event for an xdg_popup is only
    /// ever sent once for the initial configuration. Starting with version 3,
    /// it may be sent again if the popup is setup with an xdg_positioner with
    /// set_reactive requested, or in response to xdg_popup.reposition requests.
    Configure {
        /// x position relative to parent surface window geometry
        x: i32,
        /// y position relative to parent surface window geometry
        y: i32,
        /// window geometry width
        width: i32,
        /// window geometry height
        height: i32,
    },

    /// 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.
    PopupDone,

    /// signal the completion of a repositioned request
    ///
    /// The repositioned event is sent as part of a popup configuration
    /// sequence, together with xdg_popup.configure and lastly
    /// xdg_surface.configure to notify the completion of a reposition request.
    /// 
    /// The repositioned event is to notify about the completion of a
    /// xdg_popup.reposition request. The token argument is the token passed
    /// in the xdg_popup.reposition request.
    /// 
    /// Immediately after this event is emitted, xdg_popup.configure and
    /// xdg_surface.configure will be sent with the updated size and position,
    /// as well as a new configure serial.
    /// 
    /// The client should optionally update the content of the popup, but must
    /// acknowledge the new popup configuration for the new position to take
    /// effect. See xdg_surface.ack_configure for details.
    Repositioned {
        /// reposition request token
        token: u32,
    },
}

impl MessageType for Event {
    fn log(&self, this: ObjectId) -> String {
        match *self {
            Event::Configure {
                ref x,
                ref y,
                ref width,
                ref height,
            } => {
                format!("xdg_popup@{:?}::configure(x: {:?}, y: {:?}, width: {:?}, height: {:?})", this, x, y, width, height)
            }
            Event::PopupDone {
            } => {
                format!("xdg_popup@{:?}::popup_done()", this)
            }
            Event::Repositioned {
                ref token,
            } => {
                format!("xdg_popup@{:?}::repositioned(token: {:?})", this, token)
            }
        }
    }
    fn message_name(&self) -> &'static std::ffi::CStr{
        match *self {
            Event::Configure { .. } => c"xdg_popup::configure",
            Event::PopupDone { .. } => c"xdg_popup::popup_done",
            Event::Repositioned { .. } => c"xdg_popup::repositioned",
        }
    }
}
impl IntoMessage for Request {
    type Error = EncodeError;
    fn into_message(self, id: u32) -> Result<Message, <Self as IntoMessage>::Error> {
        let mut header = MessageHeader {
            sender: id,
            opcode: 0,
            length: 0,
        };
        let mut msg = Message::new();
        msg.write_header(&header)?;
        match self {
        Request::Destroy {
        } => {
            header.opcode = 0;
        },
        Request::Grab {
            seat,
            serial,
        } => {
            msg.write_arg(Arg::Object(seat))?;
            msg.write_arg(Arg::Uint(serial))?;
            header.opcode = 1;
        },
        Request::Reposition {
            positioner,
            token,
        } => {
            msg.write_arg(Arg::Object(positioner))?;
            msg.write_arg(Arg::Uint(token))?;
            header.opcode = 2;
        },
        }
        header.length = msg.bytes().len() as u16;
        msg.rewind();
        msg.write_header(&header)?;
        Ok(msg)
    }
}
impl FromArgs for Event {
    fn from_args(op: u16, mut args: Vec<Arg>) -> Result<Self, anyhow::Error> {
        match op {
        0 /* configure */ => {
            let mut iter = args.into_iter();
            Ok(Event::Configure {
                x: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,
                y: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,
                width: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,
                height: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_int()?,

            })
        },
        1 /* popup_done */ => {
            let mut iter = args.into_iter();
            Ok(Event::PopupDone {

            })
        },
        2 /* repositioned */ => {
            let mut iter = args.into_iter();
            Ok(Event::Repositioned {
                token: iter.next()
                                             .ok_or(DecodeError::InsufficientArgs)?
                                             .as_uint()?,

            })
        },
        _ => {
            Err(DecodeError::InvalidOpcode(op).into())
        },
        }
    }
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
#[repr(u32)]
pub enum Error {
    /// tried to grab after being mapped,
    InvalidGrab = 0,
}

impl Error {
    pub fn from_bits(v: u32) -> Option<Self> {
        match v {
        0 => Some(Error::InvalidGrab),
        _ => None,
        }
    }

    pub fn bits(&self) -> u32 {
        *self as u32
    }
}
impl Into<Arg> for Error {
    fn into(self) -> Arg {
        Arg::Uint(self.bits())
    }
}
} // mod xdg_popup

pub use crate::xdg_popup::XdgPopup;
pub use crate::xdg_popup::Request as XdgPopupRequest;
pub use crate::xdg_popup::Event as XdgPopupEvent;