vendor/windows-0.48.0/src/core/inspectable.rs

use super::*;

/// A WinRT object that may be used as a polymorphic stand-in for any WinRT class, interface, or boxed value.
/// [`IInspectable`] represents the
/// [IInspectable](https://docs.microsoft.com/en-us/windows/win32/api/inspectable/nn-inspectable-iinspectable)
/// interface.
#[repr(transparent)]
#[derive(Clone, PartialEq, Eq)]
pub struct IInspectable(pub IUnknown);

impl IInspectable {
    /// Returns the canonical type name for the underlying object.
    pub fn GetRuntimeClassName(&self) -> Result<HSTRING> {
        unsafe {
            let mut abi = std::ptr::null_mut();
            (self.vtable().GetRuntimeClassName)(std::mem::transmute_copy(self), &mut abi).ok()?;
            Ok(std::mem::transmute(abi))
        }
    }
}

#[doc(hidden)]
#[repr(C)]
pub struct IInspectable_Vtbl {
    pub base: IUnknown_Vtbl,
    pub GetIids: unsafe extern "system" fn(this: *mut std::ffi::c_void, count: *mut u32, values: *mut *mut GUID) -> HRESULT,
    pub GetRuntimeClassName: unsafe extern "system" fn(this: *mut std::ffi::c_void, value: *mut *mut std::ffi::c_void) -> HRESULT,
    pub GetTrustLevel: unsafe extern "system" fn(this: *mut std::ffi::c_void, value: *mut i32) -> HRESULT,
}

unsafe impl Interface for IInspectable {
    type Vtable = IInspectable_Vtbl;
}

unsafe impl ComInterface for IInspectable {
    const IID: GUID = GUID::from_u128(0xaf86e2e0_b12d_4c6a_9c5a_d7aa65101e90);
}

impl CanInto<IUnknown> for IInspectable {}

impl RuntimeType for IInspectable {
    const SIGNATURE: imp::ConstBuffer = imp::ConstBuffer::from_slice(b"cinterface(IInspectable)");
}

impl RuntimeName for IInspectable {}

#[cfg(feature = "implement")]
impl IInspectable_Vtbl {
    pub const fn new<Identity: IUnknownImpl, Name: RuntimeName, const OFFSET: isize>() -> Self {
        unsafe extern "system" fn GetIids(_: *mut std::ffi::c_void, count: *mut u32, values: *mut *mut GUID) -> windows::core::HRESULT {
            // Note: even if we end up implementing this in future, it still doesn't need a this pointer
            // since the data to be returned is type- not instance-specific so can be shared for all
            // interfaces.
            *count = 0;
            *values = std::ptr::null_mut();
            HRESULT(0)
        }
        unsafe extern "system" fn GetRuntimeClassName<T: RuntimeName>(_: *mut std::ffi::c_void, value: *mut *mut std::ffi::c_void) -> HRESULT {
            let h: HSTRING = T::NAME.into(); // TODO: should be try_into
            *value = std::mem::transmute(h);
            HRESULT(0)
        }
        unsafe extern "system" fn GetTrustLevel(_: *mut std::ffi::c_void, value: *mut i32) -> HRESULT {
            // Note: even if we end up implementing this in future, it still doesn't need a this pointer
            // since the data to be returned is type- not instance-specific so can be shared for all
            // interfaces.
            *value = 0;
            HRESULT(0)
        }
        Self { base: IUnknown_Vtbl::new::<Identity, OFFSET>(), GetIids, GetRuntimeClassName: GetRuntimeClassName::<Name>, GetTrustLevel }
    }
}