// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use glib::object::IsA;
use glib::translate::*;
use std::fmt;

glib::wrapper! {
    /// GCancellable is a thread-safe operation cancellation stack used
    /// throughout GIO to allow for cancellation of synchronous and
    /// asynchronous operations.
    ///
    /// # Implements
    ///
    /// [`CancellableExt`][trait@crate::prelude::CancellableExt], [`trait@glib::ObjectExt`], [`CancellableExtManual`][trait@crate::prelude::CancellableExtManual]
    #[doc(alias = "GCancellable")]
    pub struct Cancellable(Object<ffi::GCancellable, ffi::GCancellableClass>);

    match fn {
        type_ => || ffi::g_cancellable_get_type(),
    }
}

impl Cancellable {
    pub const NONE: Option<&'static Cancellable> = None;

    /// Creates a new [`Cancellable`][crate::Cancellable] object.
    ///
    /// Applications that want to start one or more operations
    /// that should be cancellable should create a [`Cancellable`][crate::Cancellable]
    /// and pass it to the operations.
    ///
    /// One [`Cancellable`][crate::Cancellable] can be used in multiple consecutive
    /// operations or in multiple concurrent operations.
    ///
    /// # Returns
    ///
    /// a [`Cancellable`][crate::Cancellable].
    #[doc(alias = "g_cancellable_new")]
    pub fn new() -> Cancellable {
        unsafe { from_glib_full(ffi::g_cancellable_new()) }
    }

    /// Gets the top cancellable from the stack.
    ///
    /// # Returns
    ///
    /// a [`Cancellable`][crate::Cancellable] from the top
    /// of the stack, or [`None`] if the stack is empty.
    #[doc(alias = "g_cancellable_get_current")]
    #[doc(alias = "get_current")]
    pub fn current() -> Option<Cancellable> {
        unsafe { from_glib_none(ffi::g_cancellable_get_current()) }
    }
}

impl Default for Cancellable {
    fn default() -> Self {
        Self::new()
    }
}

unsafe impl Send for Cancellable {}
unsafe impl Sync for Cancellable {}

/// Trait containing all [`struct@Cancellable`] methods.
///
/// # Implementors
///
/// [`Cancellable`][struct@crate::Cancellable]
pub trait CancellableExt: 'static {
    /// Will set `self` to cancelled, and will emit the
    /// `signal::Cancellable::cancelled` signal. (However, see the warning about
    /// race conditions in the documentation for that signal if you are
    /// planning to connect to it.)
    ///
    /// This function is thread-safe. In other words, you can safely call
    /// it from a thread other than the one running the operation that was
    /// passed the `self`.
    ///
    /// If `self` is [`None`], this function returns immediately for convenience.
    ///
    /// The convention within GIO is that cancelling an asynchronous
    /// operation causes it to complete asynchronously. That is, if you
    /// cancel the operation from the same thread in which it is running,
    /// then the operation's `GAsyncReadyCallback` will not be invoked until
    /// the application returns to the main loop.
    #[doc(alias = "g_cancellable_cancel")]
    fn cancel(&self);

    /// Gets the file descriptor for a cancellable job. This can be used to
    /// implement cancellable operations on Unix systems. The returned fd will
    /// turn readable when `self` is cancelled.
    ///
    /// You are not supposed to read from the fd yourself, just check for
    /// readable status. Reading to unset the readable status is done
    /// with `g_cancellable_reset()`.
    ///
    /// After a successful return from this function, you should use
    /// [`release_fd()`][Self::release_fd()] to free up resources allocated for
    /// the returned file descriptor.
    ///
    /// See also `g_cancellable_make_pollfd()`.
    ///
    /// # Returns
    ///
    /// A valid file descriptor. `-1` if the file descriptor
    /// is not supported, or on errors.
    #[doc(alias = "g_cancellable_get_fd")]
    #[doc(alias = "get_fd")]
    fn fd(&self) -> i32;

    /// Checks if a cancellable job has been cancelled.
    ///
    /// # Returns
    ///
    /// [`true`] if `self` is cancelled,
    /// FALSE if called with [`None`] or if item is not cancelled.
    #[doc(alias = "g_cancellable_is_cancelled")]
    fn is_cancelled(&self) -> bool;

    //#[doc(alias = "g_cancellable_make_pollfd")]
    //fn make_pollfd(&self, pollfd: /*Ignored*/&mut glib::PollFD) -> bool;

    /// Pops `self` off the cancellable stack (verifying that `self`
    /// is on the top of the stack).
    #[doc(alias = "g_cancellable_pop_current")]
    fn pop_current(&self);

    /// Pushes `self` onto the cancellable stack. The current
    /// cancellable can then be received using [`Cancellable::current()`][crate::Cancellable::current()].
    ///
    /// This is useful when implementing cancellable operations in
    /// code that does not allow you to pass down the cancellable object.
    ///
    /// This is typically called automatically by e.g. [`File`][crate::File] operations,
    /// so you rarely have to call this yourself.
    #[doc(alias = "g_cancellable_push_current")]
    fn push_current(&self);

    /// Releases a resources previously allocated by [`fd()`][Self::fd()]
    /// or `g_cancellable_make_pollfd()`.
    ///
    /// For compatibility reasons with older releases, calling this function
    /// is not strictly required, the resources will be automatically freed
    /// when the `self` is finalized. However, the `self` will
    /// block scarce file descriptors until it is finalized if this function
    /// is not called. This can cause the application to run out of file
    /// descriptors when many `GCancellables` are used at the same time.
    #[doc(alias = "g_cancellable_release_fd")]
    fn release_fd(&self);
}

impl<O: IsA<Cancellable>> CancellableExt for O {
    fn cancel(&self) {
        unsafe {
            ffi::g_cancellable_cancel(self.as_ref().to_glib_none().0);
        }
    }

    fn fd(&self) -> i32 {
        unsafe { ffi::g_cancellable_get_fd(self.as_ref().to_glib_none().0) }
    }

    fn is_cancelled(&self) -> bool {
        unsafe {
            from_glib(ffi::g_cancellable_is_cancelled(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    //fn make_pollfd(&self, pollfd: /*Ignored*/&mut glib::PollFD) -> bool {
    //    unsafe { TODO: call ffi:g_cancellable_make_pollfd() }
    //}

    fn pop_current(&self) {
        unsafe {
            ffi::g_cancellable_pop_current(self.as_ref().to_glib_none().0);
        }
    }

    fn push_current(&self) {
        unsafe {
            ffi::g_cancellable_push_current(self.as_ref().to_glib_none().0);
        }
    }

    fn release_fd(&self) {
        unsafe {
            ffi::g_cancellable_release_fd(self.as_ref().to_glib_none().0);
        }
    }
}

impl fmt::Display for Cancellable {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("Cancellable")
    }
}