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use crate::co;
use crate::decl::*;
use crate::msg::*;
use crate::prelude::*;
use crate::user::privs::*;

/// [`DTM_GETMCFONT`](https://learn.microsoft.com/en-us/windows/win32/controls/dtm-getmcfont)
/// message, which has no parameters.
///
/// Return type: `SysResult<HFONT>`.
pub struct GetMcFont {}

unsafe impl MsgSend for GetMcFont {
	type RetType = SysResult<HFONT>;

	fn convert_ret(&self, v: isize) -> Self::RetType {
		zero_as_badargs(v).map(|p| unsafe { HFONT::from_ptr(p as _) })
	}

	fn as_generic_wm(&mut self) -> WndMsg {
		WndMsg {
			msg_id: co::DTM::GETMCFONT.into(),
			wparam: 0,
			lparam: 0,
		}
	}
}

/// [`DTM_SETMCFONT`](https://learn.microsoft.com/en-us/windows/win32/controls/dtm-setmcfont)
/// message parameters.
///
/// Return type: `()`.
pub struct SetMcFont<'a> {
	pub hfont: &'a HFONT,
	pub redraw: bool,
}

unsafe impl<'a> MsgSend for SetMcFont<'a> {
	type RetType = ();

	fn convert_ret(&self, _: isize) -> Self::RetType {
		()
	}

	fn as_generic_wm(&mut self) -> WndMsg {
		WndMsg {
			msg_id: co::DTM::SETMCFONT.into(),
			wparam: self.hfont.ptr() as _,
			lparam: self.redraw as _,
		}
	}
}