Only allow one realtime effect at a time

Warning...this required a small hack that allowed updating the
menus even if the toplevel frame is not the project window.  This
is because with the active frame actually becomes the effect dialog
and UpdateMenus() bailed if it wasn't the project frame.

This should be removed when we get multiple effect support.

src/AudacityApp.h

@@ -87,6 +87,7 @@ enum
    HaveRecentFiles        = 0x02000000,
    IsNotSyncLockedFlag    = 0x04000000,  //awd
    IsSyncLockedFlag       = 0x08000000,  //awd
+   IsRealtimeNotActiveFlag= 0x10000000,  //lll
 
    NoFlagsSpecifed        = 0xffffffff
 };

src/Menus.cpp

@@ -1041,7 +1041,7 @@ void AudacityProject::CreateMenusAndCommands()
    PopulateEffectsMenu(c,
                        EffectTypeProcess,
                        AudioIONotBusyFlag | TimeSelectedFlag | WaveTracksSelectedFlag,
-                       TracksExistFlag);
+                       TracksExistFlag | IsRealtimeNotActiveFlag);
 #else
    int flags = PROCESS_EFFECT | BUILTIN_EFFECT | PLUGIN_EFFECT | ADVANCED_EFFECT;
    // The categories form a DAG, so we start at the roots (the categories
@@ -1088,7 +1088,7 @@ void AudacityProject::CreateMenusAndCommands()
    PopulateEffectsMenu(c,
                        EffectTypeAnalyze,
                        AudioIONotBusyFlag | TimeSelectedFlag | WaveTracksSelectedFlag,
-                       TracksExistFlag);
+                       TracksExistFlag | IsRealtimeNotActiveFlag);
 #else
 
    flags = ANALYZE_EFFECT | BUILTIN_EFFECT | PLUGIN_EFFECT;
@@ -1885,6 +1885,11 @@ wxUint32 AudacityProject::GetUpdateFlags()
    else
       flags |= IsNotSyncLockedFlag;
 
+#if defined(EXPERIMENTAL_REALTIME_EFFECTS)
+   if (!EffectManager::Get().RealtimeIsActive())
+      flags |= IsRealtimeNotActiveFlag;
+#endif
+
    return flags;
 }
 
@@ -1960,7 +1965,9 @@ void AudacityProject::ModifyToolbarMenus()
    mCommandManager.Check(wxT("SyncLock"), active);
 }
 
-void AudacityProject::UpdateMenus()
+// checkActive is a temporary hack that should be removed as soon as we
+// get multiple effect preview working
+void AudacityProject::UpdateMenus(bool checkActive)
 {
    //ANSWER-ME: Why UpdateMenus only does active project?
    //JKC: Is this test fixing a bug when multiple projects are open?
@@ -1968,7 +1975,7 @@ void AudacityProject::UpdateMenus()
    if (this != GetActiveProject())
       return;
 
-   if (!IsActive())
+   if (checkActive && !IsActive())
       return;
 
    wxUint32 flags = GetUpdateFlags();
@@ -3249,8 +3256,17 @@ bool AudacityProject::OnEffect(int type,
          delete newTrack;
          mTrackPanel->Refresh(false);
       }
+
+#if defined(EXPERIMENTAL_REALTIME_EFFECTS)
+      // For now, we're limiting realtime preview to a single effect, so
+      // make sure the menus reflect that fact that one may have just been
+      // opened.
+      UpdateMenus(false);
+#endif
+
       return false;
    }
+
    return true;
 }
 

src/Project.h

@@ -286,7 +286,9 @@ class AUDACITY_DLL_API AudacityProject:  public wxFrame,
    static void DeleteClipboard();
    static void DeleteAllProjectsDeleteLock();
 
-   void UpdateMenus();
+   // checkActive is a temporary hack that should be removed as soon as we
+   // get multiple effect preview working
+   void UpdateMenus(bool checkActive = true);
    void UpdatePrefs();
    void UpdatePrefsVariables();
    void RedrawProject(const bool bForceWaveTracks = false);

src/effects/EffectManager.cpp

@@ -487,6 +487,11 @@ void EffectManager::RealtimeSetEffects(const EffectArray & effects)
 #endif
 
 #if defined(EXPERIMENTAL_REALTIME_EFFECTS)
+bool EffectManager::RealtimeIsActive()
+{
+   return mRealtimeEffects.GetCount() != 0;
+}
+
 void EffectManager::RealtimeAddEffect(Effect *effect)
 {
    // Block RealtimeProcess()

src/effects/EffectManager.h

@@ -97,6 +97,7 @@ class AUDACITY_DLL_API EffectManager
 
 #if defined(EXPERIMENTAL_REALTIME_EFFECTS)
    // Realtime effect processing
+   bool RealtimeIsActive();
    void RealtimeAddEffect(Effect *effect);
    void RealtimeRemoveEffect(Effect *effect);
    void RealtimeSetEffects(const EffectArray & mActive);