Adapt raw_window_handle 0.4 for nih_plug_iced

I tried updating iced instead, but after a couple hours porting things I
gave up. Supporting newer iced versions will probably require rebuilding
the crate from scratch.

nih_plug_iced/Cargo.toml

@@ -59,11 +59,14 @@ smol = ["iced_baseview/smol"]
 nih_plug = { path = ".." }
 nih_plug_assets = { git = "https://github.com/robbert-vdh/nih_plug_assets.git" }
 
+# The currently targeted version of baseview uses a different version of
+# `raw_window_handle` than NIH-plug, so we need to manually convert between them
+raw-window-handle = "0.4"
+
 atomic_refcell = "0.1"
-baseview = { git = "https://github.com/RustAudio/baseview.git" }
+baseview = { git = "https://github.com/RustAudio/baseview.git", rev = "1d9806d5bd92275d0d8142d9c9c90198757b9b25" }
 crossbeam = "0.8"
-# Upstream doesn't work with the current iced version, this branch also contains
-# additional features
+# This targets iced 0.4
 iced_baseview = { git = "https://github.com/robbert-vdh/iced_baseview.git", branch = "feature/update-baseview", default_features = false }
 # To make the state persistable
 serde = { version = "1.0", features = ["derive"] }

nih_plug_iced/src/editor.rs

@@ -5,6 +5,7 @@ use crossbeam::atomic::AtomicCell;
 use crossbeam::channel;
 pub use iced_baseview::*;
 use nih_plug::prelude::{Editor, GuiContext, ParentWindowHandle};
+use raw_window_handle::{HasRawWindowHandle, RawWindowHandle};
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 
@@ -24,6 +25,32 @@ pub(crate) struct IcedEditorWrapper<E: IcedEditor> {
     pub(crate) parameter_updates_receiver: Arc<channel::Receiver<ParameterUpdate>>,
 }
 
+/// This version of `baseview` uses a different version of `raw_window_handle than NIH-plug, so we
+/// need to adapt it ourselves.
+struct ParentWindowHandleAdapter(nih_plug::editor::ParentWindowHandle);
+
+unsafe impl HasRawWindowHandle for ParentWindowHandleAdapter {
+    fn raw_window_handle(&self) -> RawWindowHandle {
+        match self.0 {
+            ParentWindowHandle::X11Window(window) => {
+                let mut handle = raw_window_handle::XcbHandle::empty();
+                handle.window = window;
+                RawWindowHandle::Xcb(handle)
+            }
+            ParentWindowHandle::AppKitNsView(ns_view) => {
+                let mut handle = raw_window_handle::AppKitHandle::empty();
+                handle.ns_view = ns_view;
+                RawWindowHandle::AppKit(handle)
+            }
+            ParentWindowHandle::Win32Hwnd(hwnd) => {
+                let mut handle = raw_window_handle::Win32Handle::empty();
+                handle.hwnd = hwnd;
+                RawWindowHandle::Win32(handle)
+            }
+        }
+    }
+}
+
 impl<E: IcedEditor> Editor for IcedEditorWrapper<E> {
     fn spawn(
         &self,
@@ -36,7 +63,7 @@ impl<E: IcedEditor> Editor for IcedEditorWrapper<E> {
         // TODO: iced_baseview does not have gracefuly error handling for context creation failures.
         //       This will panic if the context could not be created.
         let window = IcedWindow::<wrapper::IcedEditorWrapperApplication<E>>::open_parented(
-            &parent,
+            &ParentWindowHandleAdapter(parent),
             Settings {
                 window: WindowOpenOptions {
                     title: String::from("iced window"),