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Add comment about why we need to transmute

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IDropTargetVtbl members
This commit is contained in:
Jussi Viiri 2023-06-18 20:40:17 +03:00
parent cfa06f5b59
commit 9887737d8d
1 changed files with 2 additions and 0 deletions
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src/win/drop_target.rs
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@ -22,6 +22,8 @@ use crate::{Point, DropData, MouseEvent, Event, EventStatus, DropEffect, PhyPoin
use super::WindowState; use super::WindowState;
// These function pointers have to be stored in a (const) variable before they can be transmuted // These function pointers have to be stored in a (const) variable before they can be transmuted
// Transmuting is needed because winapi has a bug where the pt parameter has an incorrect
// type `*const POINTL`
const DRAG_ENTER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_enter; const DRAG_ENTER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_enter;
const DRAG_OVER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_over; const DRAG_OVER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_over;
const DROP_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drop; const DROP_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drop;