Make the GUI embedding work

There's still a few things that need fixing.

src/wine-host/editor.cpp

@@ -7,12 +7,17 @@ Editor::Editor(std::string window_class_name)
       x11_connection(xcb_connect(nullptr, nullptr), &xcb_disconnect) {}
 
 HWND Editor::open() {
+    // Create a window without any decoratiosn for easy embedding. The
+    // combination of `WS_EX_TOOLWINDOW` and `WS_POPUP` causes the window to be
+    // drawn without any decorations (making resizes behave as you'd expect) and
+    // also causes mouse coordinates to be relative to the window itself.
     win32_handle =
         std::unique_ptr<std::remove_pointer_t<HWND>, decltype(&DestroyWindow)>(
-            CreateWindowEx(WS_EX_TOOLWINDOW,
+            CreateWindowEx(WS_EX_TOOLWINDOW | WS_EX_ACCEPTFILES,
                            reinterpret_cast<LPCSTR>(window_class),
-                           "yabridge plugin", 0, 0, 0, 256, 256, nullptr,
-                           nullptr, GetModuleHandle(nullptr), nullptr),
+                           "yabridge plugin", WS_POPUP, CW_USEDEFAULT,
+                           CW_USEDEFAULT, 256, 256, nullptr, nullptr,
+                           GetModuleHandle(nullptr), nullptr),
             &DestroyWindow);
 
     return win32_handle->get();
@@ -26,28 +31,73 @@ void Editor::close() {
     //       everything for us?
 }
 
-#include <iostream>
+// TODO: I feel like this should only have to be done once
+bool Editor::resize(const VstRect& new_size) {
+    if (!win32_handle.has_value()) {
+        return false;
+    }
+
+    SetWindowPos(win32_handle->get(), HWND_TOP, new_size.left, new_size.top,
+                 new_size.right - new_size.left, new_size.bottom - new_size.top,
+                 0);
+
+    return true;
+}
+
+// TODO: Below function shouldn't be needed
+bool Editor::update() {
+    if (!win32_handle.has_value()) {
+        return false;
+    }
+
+    // TODO: Doing this manually should not be needed
+    UpdateWindow(win32_handle->get());
+
+    // TODO: This should also be done somewhere else
+    // Pump events since the Win32 API won't do it for us
+    MSG msg;
+    while (PeekMessage(&msg, win32_handle->get(), 0, 0, PM_REMOVE)) {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+    return true;
+}
 
 bool Editor::embed_into(const size_t parent_window_handle) {
     if (!win32_handle.has_value()) {
         return false;
     }
 
-    // TODO: Swap the order if that works once everything else works so you
-    //       don't get to see the Wine window
-    ShowWindow(win32_handle->get(), SW_SHOW);
-    UpdateWindow(win32_handle->get());
-
     const size_t child_window_handle = get_x11_handle().value();
 
     // TODO: Reparenting works, but the Wine window is not updating so that
     //       might cause it to look like it doesn't work
     xcb_reparent_window(x11_connection.get(), child_window_handle,
                         parent_window_handle, 0, 0);
+
+    // TODO: Is this needed?
+    const int parent_events = XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
+                              XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY |
+                              XCB_EVENT_MASK_STRUCTURE_NOTIFY;
+    const int child_events =
+        XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
+        XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_STRUCTURE_NOTIFY |
+        XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_PROPERTY_CHANGE;
+    xcb_change_window_attributes(x11_connection.get(), parent_window_handle,
+                                 XCB_CW_EVENT_MASK, &parent_events);
+    xcb_change_window_attributes(x11_connection.get(), child_window_handle,
+                                 XCB_CW_EVENT_MASK, &child_events);
+
     // TODO: Is this map needed?
     xcb_map_window(x11_connection.get(), child_window_handle);
     xcb_flush(x11_connection.get());
 
+    ShowWindow(win32_handle->get(), SW_SHOWNORMAL);
+    // TODO: We should just immediatly resize the window to the right size
+    //       isntead
+    UpdateWindow(win32_handle->get());
+
     return true;
 }