// 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 crate::EventController;
use crate::EventControllerScrollFlags;
use crate::Widget;
use glib::object::Cast;
use glib::object::IsA;
use glib::object::ObjectType as ObjectType_;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem::transmute;

glib::wrapper! {
    /// [`EventControllerScroll`][crate::EventControllerScroll] is an event controller meant to handle
    /// scroll events from mice and touchpads. It is capable of handling
    /// both discrete and continuous scroll events, abstracting them both
    /// on the `signal::EventControllerScroll::scroll` signal (deltas in the
    /// discrete case are multiples of 1).
    ///
    /// In the case of continuous scroll events, [`EventControllerScroll`][crate::EventControllerScroll]
    /// encloses all `signal::EventControllerScroll::scroll` events between two
    /// `signal::EventControllerScroll::scroll-begin` and `signal::EventControllerScroll::scroll-end`
    /// signals.
    ///
    /// The behavior of the event controller can be modified by the
    /// flags given at creation time, or modified at a later point through
    /// [`set_flags()`][Self::set_flags()] (e.g. because the scrolling
    /// conditions of the widget changed).
    ///
    /// The controller can be set up to emit motion for either/both vertical
    /// and horizontal scroll events through [`EventControllerScrollFlags::VERTICAL`][crate::EventControllerScrollFlags::VERTICAL],
    /// [`EventControllerScrollFlags::HORIZONTAL`][crate::EventControllerScrollFlags::HORIZONTAL] and `GTK_EVENT_CONTROLLER_SCROLL_BOTH`.
    /// If any axis is disabled, the respective `signal::EventControllerScroll::scroll`
    /// delta will be 0. Vertical scroll events will be translated to horizontal
    /// motion for the devices incapable of horizontal scrolling.
    ///
    /// The event controller can also be forced to emit discrete events on all devices
    /// through [`EventControllerScrollFlags::DISCRETE`][crate::EventControllerScrollFlags::DISCRETE]. This can be used to implement
    /// discrete actions triggered through scroll events (e.g. switching across
    /// combobox options).
    ///
    /// The [`EventControllerScrollFlags::KINETIC`][crate::EventControllerScrollFlags::KINETIC] flag toggles the emission of the
    /// `signal::EventControllerScroll::decelerate` signal, emitted at the end of scrolling
    /// with two X/Y velocity arguments that are consistent with the motion that
    /// was received.
    ///
    /// This object was added in 3.24.
    ///
    /// # Implements
    ///
    /// [`EventControllerExt`][trait@crate::prelude::EventControllerExt], [`trait@glib::ObjectExt`]
    #[doc(alias = "GtkEventControllerScroll")]
    pub struct EventControllerScroll(Object<ffi::GtkEventControllerScroll, ffi::GtkEventControllerScrollClass>) @extends EventController;

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

impl EventControllerScroll {
    /// Creates a new event controller that will handle scroll events
    /// for the given `widget`.
    /// ## `widget`
    /// a [`Widget`][crate::Widget]
    /// ## `flags`
    /// behavior flags
    ///
    /// # Returns
    ///
    /// a new [`EventControllerScroll`][crate::EventControllerScroll]
    #[doc(alias = "gtk_event_controller_scroll_new")]
    pub fn new<P: IsA<Widget>>(
        widget: &P,
        flags: EventControllerScrollFlags,
    ) -> EventControllerScroll {
        skip_assert_initialized!();
        unsafe {
            EventController::from_glib_full(ffi::gtk_event_controller_scroll_new(
                widget.as_ref().to_glib_none().0,
                flags.into_glib(),
            ))
            .unsafe_cast()
        }
    }

    /// Gets the flags conditioning the scroll controller behavior.
    ///
    /// # Returns
    ///
    /// the controller flags.
    #[doc(alias = "gtk_event_controller_scroll_get_flags")]
    #[doc(alias = "get_flags")]
    pub fn flags(&self) -> EventControllerScrollFlags {
        unsafe {
            from_glib(ffi::gtk_event_controller_scroll_get_flags(
                self.to_glib_none().0,
            ))
        }
    }

    /// Sets the flags conditioning scroll controller behavior.
    /// ## `flags`
    /// behavior flags
    #[doc(alias = "gtk_event_controller_scroll_set_flags")]
    pub fn set_flags(&self, flags: EventControllerScrollFlags) {
        unsafe {
            ffi::gtk_event_controller_scroll_set_flags(self.to_glib_none().0, flags.into_glib());
        }
    }

    /// Emitted after scroll is finished if the [`EventControllerScrollFlags::KINETIC`][crate::EventControllerScrollFlags::KINETIC]
    /// flag is set. `vel_x` and `vel_y` express the initial velocity that was
    /// imprinted by the scroll events. `vel_x` and `vel_y` are expressed in
    /// pixels/ms.
    /// ## `vel_x`
    /// X velocity
    /// ## `vel_y`
    /// Y velocity
    #[doc(alias = "decelerate")]
    pub fn connect_decelerate<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn decelerate_trampoline<
            F: Fn(&EventControllerScroll, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkEventControllerScroll,
            vel_x: libc::c_double,
            vel_y: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this), vel_x, vel_y)
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"decelerate\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    decelerate_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that the widget should scroll by the
    /// amount specified by `dx` and `dy`.
    /// ## `dx`
    /// X delta
    /// ## `dy`
    /// Y delta
    #[doc(alias = "scroll")]
    pub fn connect_scroll<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn scroll_trampoline<
            F: Fn(&EventControllerScroll, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkEventControllerScroll,
            dx: libc::c_double,
            dy: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this), dx, dy)
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that a new scrolling operation has begun. It will
    /// only be emitted on devices capable of it.
    #[doc(alias = "scroll-begin")]
    pub fn connect_scroll_begin<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn scroll_begin_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll-begin\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_begin_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    /// Signals that a new scrolling operation has finished. It will
    /// only be emitted on devices capable of it.
    #[doc(alias = "scroll-end")]
    pub fn connect_scroll_end<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn scroll_end_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"scroll-end\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    scroll_end_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    #[cfg(any(feature = "v3_24", feature = "dox"))]
    #[cfg_attr(feature = "dox", doc(cfg(feature = "v3_24")))]
    #[doc(alias = "flags")]
    pub fn connect_flags_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_flags_trampoline<F: Fn(&EventControllerScroll) + 'static>(
            this: *mut ffi::GtkEventControllerScroll,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::flags\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_flags_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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