ProjectWindowPlacement wraps project's frame, toolkit-neutrally

src/Project.cpp

@@ -14,7 +14,8 @@
 
 #include "KeyboardCapture.h"
 #include "TempDirectory.h"
-#include "./widgets/ErrorDialog.h"
+#include "widgets/ErrorDialog.h"
+#include "widgets/wxWidgetsBasicUI.h"
 
 #include <wx/display.h>
 #include <wx/filename.h>
@@ -199,6 +200,15 @@ AUDACITY_DLL_API const wxFrame &GetProjectFrame( const AudacityProject &project
    return *ptr;
 }
 
+std::unique_ptr<const BasicUI::WindowPlacement>
+ProjectFramePlacement( AudacityProject *project )
+{
+   if (!project)
+      return std::make_unique<BasicUI::WindowPlacement>();
+   return std::make_unique<wxWidgetsWindowPlacement>(
+      &GetProjectFrame(*project));
+}
+
 AUDACITY_DLL_API wxWindow &GetProjectPanel( AudacityProject &project )
 {
    auto ptr = project.GetPanel();

src/Project.h

@@ -22,6 +22,7 @@
 
 class wxFrame;
 class wxWindow;
+namespace BasicUI { class WindowPlacement; }
 
 class AudacityProject;
 
@@ -176,6 +177,11 @@ inline const wxFrame *FindProjectFrame( const AudacityProject *project ) {
    return project ? &GetProjectFrame( *project ) : nullptr;
 }
 
+//! Make a WindowPlacement object suitable for `project` (which may be null)
+/*! @post return value is not null */
+AUDACITY_DLL_API std::unique_ptr<const BasicUI::WindowPlacement>
+ProjectFramePlacement( AudacityProject *project );
+
 ///\brief Get the main sub-window of the project frame that displays track data
 // (as a wxWindow only, when you do not need to use the subclass TrackPanel)
 AUDACITY_DLL_API wxWindow &GetProjectPanel( AudacityProject &project );