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

use crate::EventController;
use crate::Gesture;
use crate::GestureSingle;
use crate::PropagationLimit;
use crate::PropagationPhase;
use glib::object::Cast;
use glib::object::IsA;
use glib::signal::connect_raw;
use glib::signal::SignalHandlerId;
use glib::translate::*;
use glib::StaticType;
use glib::ToValue;
use std::boxed::Box as Box_;
use std::fmt;
use std::mem;
use std::mem::transmute;

glib::wrapper! {
    /// [`GestureDrag`][crate::GestureDrag] is a [`Gesture`][crate::Gesture] implementation for drags.
    ///
    /// The drag operation itself can be tracked throughout the
    /// `signal::GestureDrag::drag-begin`,
    /// `signal::GestureDrag::drag-update` and
    /// `signal::GestureDrag::drag-end` signals, and the relevant
    /// coordinates can be extracted through
    /// [`GestureDragExt::offset()`][crate::prelude::GestureDragExt::offset()] and
    /// [`GestureDragExt::start_point()`][crate::prelude::GestureDragExt::start_point()].
    ///
    /// # Implements
    ///
    /// [`GestureDragExt`][trait@crate::prelude::GestureDragExt], [`GestureSingleExt`][trait@crate::prelude::GestureSingleExt], [`GestureExt`][trait@crate::prelude::GestureExt], [`EventControllerExt`][trait@crate::prelude::EventControllerExt], [`trait@glib::ObjectExt`]
    #[doc(alias = "GtkGestureDrag")]
    pub struct GestureDrag(Object<ffi::GtkGestureDrag, ffi::GtkGestureDragClass>) @extends GestureSingle, Gesture, EventController;

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

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

    /// Returns a newly created [`Gesture`][crate::Gesture] that recognizes drags.
    ///
    /// # Returns
    ///
    /// a newly created [`GestureDrag`][crate::GestureDrag]
    #[doc(alias = "gtk_gesture_drag_new")]
    pub fn new() -> GestureDrag {
        assert_initialized_main_thread!();
        unsafe { Gesture::from_glib_full(ffi::gtk_gesture_drag_new()).unsafe_cast() }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`GestureDrag`] objects.
    ///
    /// This method returns an instance of [`GestureDragBuilder`](crate::builders::GestureDragBuilder) which can be used to create [`GestureDrag`] objects.
    pub fn builder() -> GestureDragBuilder {
        GestureDragBuilder::default()
    }
}

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

#[derive(Clone, Default)]
// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`GestureDrag`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct GestureDragBuilder {
    button: Option<u32>,
    exclusive: Option<bool>,
    touch_only: Option<bool>,
    n_points: Option<u32>,
    name: Option<String>,
    propagation_limit: Option<PropagationLimit>,
    propagation_phase: Option<PropagationPhase>,
}

impl GestureDragBuilder {
    // rustdoc-stripper-ignore-next
    /// Create a new [`GestureDragBuilder`].
    pub fn new() -> Self {
        Self::default()
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`GestureDrag`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> GestureDrag {
        let mut properties: Vec<(&str, &dyn ToValue)> = vec![];
        if let Some(ref button) = self.button {
            properties.push(("button", button));
        }
        if let Some(ref exclusive) = self.exclusive {
            properties.push(("exclusive", exclusive));
        }
        if let Some(ref touch_only) = self.touch_only {
            properties.push(("touch-only", touch_only));
        }
        if let Some(ref n_points) = self.n_points {
            properties.push(("n-points", n_points));
        }
        if let Some(ref name) = self.name {
            properties.push(("name", name));
        }
        if let Some(ref propagation_limit) = self.propagation_limit {
            properties.push(("propagation-limit", propagation_limit));
        }
        if let Some(ref propagation_phase) = self.propagation_phase {
            properties.push(("propagation-phase", propagation_phase));
        }
        glib::Object::new::<GestureDrag>(&properties)
            .expect("Failed to create an instance of GestureDrag")
    }

    /// Mouse button number to listen to, or 0 to listen for any button.
    pub fn button(mut self, button: u32) -> Self {
        self.button = Some(button);
        self
    }

    /// Whether the gesture is exclusive.
    ///
    /// Exclusive gestures only listen to pointer and pointer emulated events.
    pub fn exclusive(mut self, exclusive: bool) -> Self {
        self.exclusive = Some(exclusive);
        self
    }

    /// Whether the gesture handles only touch events.
    pub fn touch_only(mut self, touch_only: bool) -> Self {
        self.touch_only = Some(touch_only);
        self
    }

    /// The number of touch points that trigger
    /// recognition on this gesture.
    pub fn n_points(mut self, n_points: u32) -> Self {
        self.n_points = Some(n_points);
        self
    }

    /// The name for this controller, typically used for debugging purposes.
    pub fn name(mut self, name: &str) -> Self {
        self.name = Some(name.to_string());
        self
    }

    /// The limit for which events this controller will handle.
    pub fn propagation_limit(mut self, propagation_limit: PropagationLimit) -> Self {
        self.propagation_limit = Some(propagation_limit);
        self
    }

    /// The propagation phase at which this controller will handle events.
    pub fn propagation_phase(mut self, propagation_phase: PropagationPhase) -> Self {
        self.propagation_phase = Some(propagation_phase);
        self
    }
}

/// Trait containing all [`struct@GestureDrag`] methods.
///
/// # Implementors
///
/// [`GestureDrag`][struct@crate::GestureDrag], [`GesturePan`][struct@crate::GesturePan]
pub trait GestureDragExt: 'static {
    /// Gets the offset from the start point.
    ///
    /// If the @self is active, this function returns [`true`] and
    /// fills in @x and @y with the coordinates of the current point,
    /// as an offset to the starting drag point.
    ///
    /// # Returns
    ///
    /// [`true`] if the gesture is active
    ///
    /// ## `x`
    /// X offset for the current point
    ///
    /// ## `y`
    /// Y offset for the current point
    #[doc(alias = "gtk_gesture_drag_get_offset")]
    #[doc(alias = "get_offset")]
    fn offset(&self) -> Option<(f64, f64)>;

    /// Gets the point where the drag started.
    ///
    /// If the @self is active, this function returns [`true`]
    /// and fills in @x and @y with the drag start coordinates,
    /// in surface-relative coordinates.
    ///
    /// # Returns
    ///
    /// [`true`] if the gesture is active
    ///
    /// ## `x`
    /// X coordinate for the drag start point
    ///
    /// ## `y`
    /// Y coordinate for the drag start point
    #[doc(alias = "gtk_gesture_drag_get_start_point")]
    #[doc(alias = "get_start_point")]
    fn start_point(&self) -> Option<(f64, f64)>;

    /// Emitted whenever dragging starts.
    /// ## `start_x`
    /// X coordinate, relative to the widget allocation
    /// ## `start_y`
    /// Y coordinate, relative to the widget allocation
    #[doc(alias = "drag-begin")]
    fn connect_drag_begin<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId;

    /// Emitted whenever the dragging is finished.
    /// ## `offset_x`
    /// X offset, relative to the start point
    /// ## `offset_y`
    /// Y offset, relative to the start point
    #[doc(alias = "drag-end")]
    fn connect_drag_end<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId;

    /// Emitted whenever the dragging point moves.
    /// ## `offset_x`
    /// X offset, relative to the start point
    /// ## `offset_y`
    /// Y offset, relative to the start point
    #[doc(alias = "drag-update")]
    fn connect_drag_update<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<GestureDrag>> GestureDragExt for O {
    fn offset(&self) -> Option<(f64, f64)> {
        unsafe {
            let mut x = mem::MaybeUninit::uninit();
            let mut y = mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::gtk_gesture_drag_get_offset(
                self.as_ref().to_glib_none().0,
                x.as_mut_ptr(),
                y.as_mut_ptr(),
            ));
            if ret {
                Some((x.assume_init(), y.assume_init()))
            } else {
                None
            }
        }
    }

    fn start_point(&self) -> Option<(f64, f64)> {
        unsafe {
            let mut x = mem::MaybeUninit::uninit();
            let mut y = mem::MaybeUninit::uninit();
            let ret = from_glib(ffi::gtk_gesture_drag_get_start_point(
                self.as_ref().to_glib_none().0,
                x.as_mut_ptr(),
                y.as_mut_ptr(),
            ));
            if ret {
                Some((x.assume_init(), y.assume_init()))
            } else {
                None
            }
        }
    }

    fn connect_drag_begin<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn drag_begin_trampoline<
            P: IsA<GestureDrag>,
            F: Fn(&P, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkGestureDrag,
            start_x: libc::c_double,
            start_y: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                GestureDrag::from_glib_borrow(this).unsafe_cast_ref(),
                start_x,
                start_y,
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"drag-begin\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    drag_begin_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_drag_end<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn drag_end_trampoline<
            P: IsA<GestureDrag>,
            F: Fn(&P, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkGestureDrag,
            offset_x: libc::c_double,
            offset_y: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                GestureDrag::from_glib_borrow(this).unsafe_cast_ref(),
                offset_x,
                offset_y,
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"drag-end\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    drag_end_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }

    fn connect_drag_update<F: Fn(&Self, f64, f64) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn drag_update_trampoline<
            P: IsA<GestureDrag>,
            F: Fn(&P, f64, f64) + 'static,
        >(
            this: *mut ffi::GtkGestureDrag,
            offset_x: libc::c_double,
            offset_y: libc::c_double,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                GestureDrag::from_glib_borrow(this).unsafe_cast_ref(),
                offset_x,
                offset_y,
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"drag-update\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    drag_update_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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