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use crate::Actor;
use glib::{
object::{Cast, IsA},
signal::{connect_raw, SignalHandlerId},
translate::*,
};
use std::boxed::Box as Box_;
use std::{fmt, mem, mem::transmute};
glib_wrapper! {
pub struct Content(Interface<ffi::ClutterContent>);
match fn {
get_type => || ffi::clutter_content_get_type(),
}
}
/// Trait containing all `Content` methods.
///
/// # Implementors
///
/// [`Canvas`](struct.Canvas.html), [`Content`](struct.Content.html), [`Image`](struct.Image.html)
pub trait ContentExt: 'static {
/// Retrieves the natural size of the `self`, if any.
///
/// The natural size of a `Content` is defined as the size the content
/// would have regardless of the allocation of the actor that is painting it,
/// for instance the size of an image data.
/// ## `width`
/// return location for the natural width of the content
/// ## `height`
/// return location for the natural height of the content
///
/// # Returns
///
/// `true` if the content has a preferred size, and `false`
/// otherwise
fn get_preferred_size(&self) -> Option<(f32, f32)>;
/// Invalidates a `Content`.
///
/// This function should be called by `Content` implementations when
/// they change the way a the content should be painted regardless of the
/// actor state.
fn invalidate(&self);
/// This signal is emitted each time a `Content` implementation is
/// assigned to a `Actor`.
/// ## `actor`
/// a `Actor`
fn connect_attached<F: Fn(&Self, &Actor) + 'static>(&self, f: F) -> SignalHandlerId;
/// This signal is emitted each time a `Content` implementation is
/// removed from a `Actor`.
/// ## `actor`
/// a `Actor`
fn connect_detached<F: Fn(&Self, &Actor) + 'static>(&self, f: F) -> SignalHandlerId;
}
impl<O: IsA<Content>> ContentExt for O {
fn get_preferred_size(&self) -> Option<(f32, f32)> {
unsafe {
let mut width = mem::MaybeUninit::uninit();
let mut height = mem::MaybeUninit::uninit();
let ret = from_glib(ffi::clutter_content_get_preferred_size(
self.as_ref().to_glib_none().0,
width.as_mut_ptr(),
height.as_mut_ptr(),
));
let width = width.assume_init();
let height = height.assume_init();
if ret {
Some((width, height))
} else {
None
}
}
}
fn invalidate(&self) {
unsafe {
ffi::clutter_content_invalidate(self.as_ref().to_glib_none().0);
}
}
fn connect_attached<F: Fn(&Self, &Actor) + 'static>(&self, f: F) -> SignalHandlerId {
unsafe extern "C" fn attached_trampoline<P, F: Fn(&P, &Actor) + 'static>(
this: *mut ffi::ClutterContent,
actor: *mut ffi::ClutterActor,
f: glib_sys::gpointer,
) where
P: IsA<Content>,
{
let f: &F = &*(f as *const F);
f(
&Content::from_glib_borrow(this).unsafe_cast_ref(),
&from_glib_borrow(actor),
)
}
unsafe {
let f: Box_<F> = Box_::new(f);
connect_raw(
self.as_ptr() as *mut _,
b"attached\0".as_ptr() as *const _,
Some(transmute::<_, unsafe extern "C" fn()>(
attached_trampoline::<Self, F> as *const (),
)),
Box_::into_raw(f),
)
}
}
fn connect_detached<F: Fn(&Self, &Actor) + 'static>(&self, f: F) -> SignalHandlerId {
unsafe extern "C" fn detached_trampoline<P, F: Fn(&P, &Actor) + 'static>(
this: *mut ffi::ClutterContent,
actor: *mut ffi::ClutterActor,
f: glib_sys::gpointer,
) where
P: IsA<Content>,
{
let f: &F = &*(f as *const F);
f(
&Content::from_glib_borrow(this).unsafe_cast_ref(),
&from_glib_borrow(actor),
)
}
unsafe {
let f: Box_<F> = Box_::new(f);
connect_raw(
self.as_ptr() as *mut _,
b"detached\0".as_ptr() as *const _,
Some(transmute::<_, unsafe extern "C" fn()>(
detached_trampoline::<Self, F> as *const (),
)),
Box_::into_raw(f),
)
}
}
}
impl fmt::Display for Content {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Content")
}
}