Do not require AudacityApp.h when using global file history

src/AudacityApp.cpp

@@ -722,10 +722,6 @@ void AudacityApp::MacNewFile()
 
 #endif //__WXMAC__
 
-#define ID_RECENT_CLEAR 6100
-#define ID_RECENT_FIRST 6101
-#define ID_RECENT_LAST  6112
-
 // IPC communication
 #define ID_IPC_SERVER   6200
 #define ID_IPC_SOCKET   6201
@@ -752,8 +748,9 @@ BEGIN_EVENT_TABLE(AudacityApp, wxApp)
 #endif
 
    // Recent file event handlers.
-   EVT_MENU(ID_RECENT_CLEAR, AudacityApp::OnMRUClear)
-   EVT_MENU_RANGE(ID_RECENT_FIRST, ID_RECENT_LAST, AudacityApp::OnMRUFile)
+   EVT_MENU(FileHistory::ID_RECENT_CLEAR, AudacityApp::OnMRUClear)
+   EVT_MENU_RANGE(FileHistory::ID_RECENT_FIRST, FileHistory::ID_RECENT_LAST,
+      AudacityApp::OnMRUFile)
 
    // Handle AppCommandEvents (usually from a script)
    EVT_APP_COMMAND(wxID_ANY, AudacityApp::OnReceiveCommand)
@@ -820,15 +817,16 @@ bool AudacityApp::SafeMRUOpen(const wxString &fullPathStr)
 
 void AudacityApp::OnMRUClear(wxCommandEvent& WXUNUSED(event))
 {
-   mRecentFiles->Clear();
+   FileHistory::Global().Clear();
 }
 
 //vvv Basically, anything from Recent Files is treated as a .aup, until proven otherwise,
 // then it tries to Import(). Very questionable handling, imo.
 // Better, for example, to check the file type early on.
 void AudacityApp::OnMRUFile(wxCommandEvent& event) {
-   int n = event.GetId() - ID_RECENT_FIRST;
-   const auto &fullPathStr = mRecentFiles->GetHistoryFile(n);
+   int n = event.GetId() - FileHistory::ID_RECENT_FIRST;
+   auto &history = FileHistory::Global();
+   const auto &fullPathStr = history.GetHistoryFile(n);
 
    // Try to open only if not already open.
    // Test IsAlreadyOpen() here even though AudacityProject::MRUOpen() also now checks,
@@ -839,7 +837,7 @@ void AudacityApp::OnMRUFile(wxCommandEvent& event) {
    // -- if open fails for some exceptional reason of resource exhaustion that
    // the user can correct, leave the file in history.
    if (!AudacityProject::IsAlreadyOpen(fullPathStr) && !MRUOpen(fullPathStr))
-      mRecentFiles->RemoveFileFromHistory(n);
+      history.RemoveFileFromHistory(n);
 }
 
 void AudacityApp::OnTimer(wxTimerEvent& WXUNUSED(event))
@@ -1445,10 +1443,6 @@ bool AudacityApp::OnInit()
    this->AssociateFileTypes();
 #endif
 
-   // TODO - read the number of files to store in history from preferences
-   mRecentFiles = std::make_unique<FileHistory>(ID_RECENT_LAST - ID_RECENT_FIRST + 1, ID_RECENT_CLEAR);
-   mRecentFiles->Load(*gPrefs, wxT("RecentFiles"));
-
    theTheme.EnsureInitialised();
 
    // AColor depends on theTheme.
@@ -1592,8 +1586,9 @@ bool AudacityApp::OnInit()
          wxMenuBar::MacSetCommonMenuBar(menuBar.release());
       }
 
-      mRecentFiles->UseMenu(recentMenu);
-      mRecentFiles->AddFilesToMenu(recentMenu);
+      auto &recentFiles = FileHistory::Global();
+      recentFiles.UseMenu(recentMenu);
+      recentFiles.AddFilesToMenu(recentMenu);
 
       SetExitOnFrameDelete(false);
 
@@ -2185,11 +2180,6 @@ void AudacityApp::OnEndSession(wxCloseEvent & event)
    }
 }
 
-void AudacityApp::AddFileToHistory(const FilePath & name)
-{
-   mRecentFiles->AddFileToHistory(name);
-}
-
 int AudacityApp::OnExit()
 {
    gIsQuitting = true;
@@ -2212,7 +2202,7 @@ int AudacityApp::OnExit()
       }
    }
 
-   mRecentFiles->Save(*gPrefs, wxT("RecentFiles"));
+   FileHistory::Global().Save(*gPrefs, wxT("RecentFiles"));
 
    FinishPreferences();
 

src/AudacityApp.h

@@ -39,7 +39,6 @@ class CommandHandler;
 class AppCommandEvent;
 class AudacityLogger;
 class AudacityProject;
-class FileHistory;
 
 void SaveWindowSize();
 
@@ -155,8 +154,6 @@ class AudacityApp final : public wxApp {
                                    int flags = wxDIR_FILES);
    static bool IsTempDirectoryNameOK( const wxString & Name );
 
-   FileHistory *GetRecentFiles() {return mRecentFiles.get();}
-   void AddFileToHistory(const FilePath & name);
    bool GetWindowRectAlreadySaved()const {return mWindowRectAlreadySaved;}
    void SetWindowRectAlreadySaved(bool alreadySaved) {mWindowRectAlreadySaved = alreadySaved;}
 
@@ -181,7 +178,6 @@ class AudacityApp final : public wxApp {
 
  private:
    std::unique_ptr<CommandHandler> mCmdHandler;
-   std::unique_ptr<FileHistory> mRecentFiles;
 
    std::unique_ptr<wxLocale> mLocale;
 

src/Menus.cpp

@@ -31,7 +31,6 @@
 #include "Experimental.h"
 
 #include "AdornedRulerPanel.h"
-#include "AudacityApp.h"
 #include "AudioIO.h"
 #include "Clipboard.h"
 #include "LabelTrack.h"
@@ -538,7 +537,7 @@ CommandFlag MenuManager::GetUpdateFlags
       }
    }
 
-   if (wxGetApp().GetRecentFiles()->GetCount() > 0)
+   if (FileHistory::Global().GetCount() > 0)
       flags |= HaveRecentFiles;
 
    if (project.IsSyncLocked())

src/Project.cpp

@@ -95,6 +95,7 @@ scroll information.  It also has some status flags.
 
 #include "AdornedRulerPanel.h"
 #include "Clipboard.h"
+#include "widgets/FileHistory.h"
 #include "FreqWindow.h"
 #include "effects/Contrast.h"
 #include "AutoRecovery.h"
@@ -3129,9 +3130,8 @@ void AudacityProject::OpenFile(const FilePath &fileNameArg, bool addtohistory)
       // else any asynch calls into the blockfile code will not have
       // finished logging errors (if any) before the call to ProjectFSCK()
 
-      if (addtohistory) {
-         wxGetApp().AddFileToHistory(fileName);
-      }
+      if (addtohistory)
+         FileHistory::Global().AddFileToHistory(fileName);
    }
 
    // Use a finally block here, because there are calls to Save() below which
@@ -4293,7 +4293,7 @@ bool AudacityProject::Import(const FilePath &fileName, WaveTrackArray* pTrackArr
       if (!success)
          return false;
 
-      wxGetApp().AddFileToHistory(fileName);
+      FileHistory::Global().AddFileToHistory(fileName);
 
       // no more errors, commit
       cleanup.release();
@@ -4372,7 +4372,7 @@ bool AudacityProject::SaveAs(const wxString & newFileName, bool bWantSaveCopy /*
    success = DoSave(!bOwnsNewAupName || bWantSaveCopy, bWantSaveCopy);
 
    if (success && addToHistory) {
-      wxGetApp().AddFileToHistory(mFileName);
+      FileHistory::Global().AddFileToHistory(mFileName);
    }
    if (!success || bWantSaveCopy) // bWantSaveCopy doesn't actually change current project.
    {
@@ -4542,7 +4542,7 @@ will be irreversibly overwritten."), fName, fName);
    success = DoSave(!bOwnsNewAupName || bWantSaveCopy, bWantSaveCopy, bLossless);
 
    if (success) {
-      wxGetApp().AddFileToHistory(mFileName);
+      FileHistory::Global().AddFileToHistory(mFileName);
       if( !bHasPath )
       {
          gPrefs->Write( wxT("/SaveAs/Path"), filename.GetPath());
@@ -5354,7 +5354,7 @@ bool AudacityProject::SaveFromTimerRecording(wxFileName fnFile) {
    bSuccess = DoSave(true, false);
 
    if (bSuccess) {
-      wxGetApp().AddFileToHistory(mFileName);
+      FileHistory::Global().AddFileToHistory(mFileName);
       mbLoadedFromAup = true;
       SetProjectTitle();
    }

src/menus/FileMenus.cpp

@@ -81,7 +81,7 @@ void DoExport
    }
    else
    {
-      wxGetApp().AddFileToHistory(filename);
+      FileHistory::Global().AddFileToHistory(filename);
       // We're in batch mode, the file does not exist already.
       // We really can proceed without prompting.
       int nChannels = MacroCommands::IsMono() ? 1 : 2;
@@ -131,7 +131,7 @@ AudacityProject *DoImportMIDI(
       pProject->ZoomAfterImport(pTrack);
       pNewProject = nullptr;
 
-      wxGetApp().AddFileToHistory(fileName);
+      FileHistory::Global().AddFileToHistory(fileName);
 
       return pProject;
    }
@@ -597,8 +597,9 @@ MenuTable::BaseItemPtr FileMenu( AudacityProject& )
          ,
          Special( [](AudacityProject &, wxMenu &theMenu){
             // Recent Files and Recent Projects menus
-            wxGetApp().GetRecentFiles()->UseMenu( &theMenu );
-            wxGetApp().GetRecentFiles()->AddFilesToMenu( &theMenu );
+            auto &history = FileHistory::Global();
+            history.UseMenu( &theMenu );
+            history.AddFilesToMenu( &theMenu );
 
             wxWeakRef<wxMenu> recentFilesMenu{ &theMenu };
             wxTheApp->CallAfter( [=] {

src/widgets/FileHistory.cpp

@@ -9,7 +9,7 @@
 *******************************************************************//**
 
 \class FileHistory
-\brief Similar to FileHistory, but customized to our needs.
+\brief Similar to wxFileHistory, but customized to our needs.
 
 *//*******************************************************************/
 
@@ -21,6 +21,9 @@
 #include <wx/menu.h>
 
 #include "../Internat.h"
+#include "../Prefs.h"
+
+#include <mutex>
 
 FileHistory::FileHistory(size_t maxfiles, wxWindowID base)
 {
@@ -32,6 +35,19 @@ FileHistory::~FileHistory()
 {
 }
 
+FileHistory &FileHistory::Global()
+{
+   // TODO - read the number of files to store in history from preferences
+   static FileHistory history{
+      ID_RECENT_LAST - ID_RECENT_FIRST + 1, ID_RECENT_CLEAR };
+   static std::once_flag flag;
+   std::call_once( flag, [&]{
+      history.Load(*gPrefs, wxT("RecentFiles"));
+   });
+
+   return history;
+}
+
 // File history management
 void FileHistory::AddFileToHistory(const FilePath & file, bool update)
 {

src/widgets/FileHistory.h

@@ -28,6 +28,15 @@ class AUDACITY_DLL_API FileHistory
    FileHistory(size_t maxfiles = 12, wxWindowID idbase = wxID_FILE);
    virtual ~FileHistory();
 
+   // These constants define the range of IDs reserved by the global file history
+   enum {
+      ID_RECENT_CLEAR = 6100,
+      ID_RECENT_FIRST = 6101,
+      ID_RECENT_LAST  = 6112
+   };
+
+   static FileHistory &Global();
+
    void AddFileToHistory(const FilePath & file, bool update = true);
    void RemoveFileFromHistory(size_t i, bool update = true);
    void Clear();