Rename win32-editor.h -> editor.h

Since I no longer intent to do separate X11 handling on the plugin side

src/wine-host/editor.h

@@ -0,0 +1,47 @@
+#define NOMINMAX
+#define NOSERVICE
+#define NOMCX
+#define NOIMM
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include <memory>
+#include <optional>
+#include <string>
+
+/**
+ * A wrapper around the win32 windowing API to create and destroy editor
+ * windows. A VST plugin can embed itself in that window, and we can then later
+ * embed the window in a VST host provided X11 window.
+ */
+class Win32Editor {
+   public:
+    /**
+     * @param window_class_name The name for the window class for editor
+     *   windows.
+     */
+    Win32Editor(std::string window_class_name);
+
+    /**
+     * Open a window and return a handle to the new Win32 window that can be
+     * used by the hosted VST plugin.
+     */
+    HWND open();
+    void close();
+
+    /**
+     * Return the X11 window handle for the window if it's currently open.
+     */
+    std::optional<intptr_t> get_x11_handle();
+
+   private:
+    ATOM window_class;
+
+    /**
+     * A pointer to the currently active window. Will be a null pointer if no
+     * window is active.
+     */
+    std::optional<
+        std::unique_ptr<std::remove_pointer_t<HWND>, decltype(&DestroyWindow)>>
+        window_handle;
+};