bug 26 followup - warn of missing alias on variety of instances (export/import/effect/mix,) in addition to first time the read fails.\nIn addition make sure there is only one warning on the screen at a time, bringing the old one to the foreground (although for things like export/effect there will be a progress bar in front of it, the missing files dialog will be above the project window when it finishes)

src/AudioIO.cpp

@@ -479,14 +479,15 @@ void DeinitAudioIO()
 
 void AudioIO::MarkAliasedFilesMissingWarning()
 {
-   // only show the warning when we are playing or recording
-   if (IsStreamActive()) {
-      m_aliasMissingWarning = true;
-   }
+   m_aliasMissingWarning = true;
 }
 
 void AudioIO::SetMissingAliasedFileWarningShouldShow(bool b)
 {
+   // Note that this is can be called by both the main thread and other threads.
+   // I don't believe we need a mutex because we are checking zero vs non-zero,
+   // and the setting from other threads will always be non-zero (true), and the
+   // setting from the main thread is always false.
    m_aliasMissingWarningShouldShow = b;
    // reset the warnings as they were probably marked by a previous run
    if (m_aliasMissingWarningShouldShow) {
@@ -501,6 +502,17 @@ bool AudioIO::ShouldShowMissingAliasedFileWarning()
    return ret;
 }
 
+void AudioIO::SetMissingAliasFileDialog(wxDialog *dialog)
+{
+   m_aliasMissingWarningDialog = dialog;
+}
+   
+wxDialog *AudioIO::GetMissingAliasFileDialog()
+{
+   return m_aliasMissingWarningDialog;
+}
+
+
 wxString DeviceName(const PaDeviceInfo* info)
 {
    wxString infoName(info->name, wxConvLocal);
@@ -534,8 +546,9 @@ AudioIO::AudioIO()
    mAudioThreadFillBuffersLoopActive = false;
    mPortStreamV19 = NULL;
 
-   m_aliasMissingWarningShouldShow = false;
+   m_aliasMissingWarningShouldShow = true;
    m_aliasMissingWarning           = false;
+   m_aliasMissingWarningDialog     = NULL;
 
 #ifdef EXPERIMENTAL_MIDI_OUT
    mMidiStream = NULL;

src/AudioIO.h

@@ -43,6 +43,7 @@ class TimeTrack;
 class AudioThread;
 class Meter;
 class TimeTrack;
+class wxDialog;
 
 extern AUDACITY_DLL_API AudioIO *gAudioIO;
 
@@ -320,6 +321,15 @@ class AUDACITY_DLL_API AudioIO {
    /** \brief Returns true if the user should be notified of missing alias warnings
      */
    bool ShouldShowMissingAliasedFileWarning();
+   
+   /** \brief Sets the wxDialog that is being displayed 
+     * Used by the custom dialog warning constructor and destructor
+     */
+   void SetMissingAliasFileDialog(wxDialog *dialog);
+   
+   /** \brief returns a pointer to the wxDialog if it is displayed, NULL otherwise.
+     */
+   wxDialog *GetMissingAliasFileDialog();
 
    /** \brief Function to automatically set an acceptable volume
     *
@@ -527,6 +537,7 @@ private:
 
    bool                m_aliasMissingWarningShouldShow;
    bool                m_aliasMissingWarning;
+   wxDialog            *m_aliasMissingWarningDialog;
 
 #ifdef EXPERIMENTAL_MIDI_OUT
    volatile bool       mMidiThreadFillBuffersLoopRunning;

src/Menus.cpp

@@ -2665,6 +2665,9 @@ bool AudacityProject::OnEffect(int type,
                                wxString params,
                                bool saveState)
 {
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
+
    TrackListIterator iter(mTracks);
    Track *t = iter.First();
    WaveTrack *newTrack = NULL;
@@ -3024,6 +3027,8 @@ void AudacityProject::OnExport()
 {
    Exporter e;
 
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
    e.Process(this, false, 0.0, mTracks->GetEndTime());
 }
 
@@ -3031,6 +3036,8 @@ void AudacityProject::OnExportSelection()
 {
    Exporter e;
 
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
    e.Process(this, true, mViewInfo.sel0, mViewInfo.sel1);
 }
 
@@ -3038,6 +3045,8 @@ void AudacityProject::OnExportMultiple()
 {
    ExportMultiple em(this);
    
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
    em.ShowModal();
 }
 
@@ -4603,6 +4612,11 @@ void AudacityProject::OnSimplifiedView()
 
 void AudacityProject::OnImport()
 {
+   // An import trigger for the alias missing dialog might not be intuitive, but
+   // this serves to track the file if the users zooms in and such.
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
+      
    wxArrayString selectedFiles = ShowOpenDialog(wxT(""));
    if (selectedFiles.GetCount() == 0) {
       gPrefs->Write(wxT("/LastOpenType"),wxT(""));
@@ -4748,6 +4762,9 @@ void AudacityProject::HandleMixAndRender(bool toNewTrack)
    WaveTrack *newLeft = NULL;
    WaveTrack *newRight = NULL;
 
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
+
    if (::MixAndRender(mTracks, mTrackFactory, mRate, mDefaultFormat, 0.0, 0.0,
                       &newLeft, &newRight)) {
 

src/Project.cpp

@@ -760,6 +760,9 @@ AudacityProject::AudacityProject(wxWindow * parent, wxWindowID id,
    mStatusBar = CreateStatusBar(2);
    mStatusBar->SetStatusWidths(2, widths);
 
+   if (gAudioIO)
+      gAudioIO->SetMissingAliasedFileWarningShouldShow(true);
+
    // MM: DirManager is created dynamically, freed on demand via ref-counting
    // MM: We don't need to Ref() here because it start with refcount=1
    mDirManager = new DirManager();
@@ -3905,16 +3908,22 @@ void AudacityProject::OnTimer(wxTimerEvent& event)
 
    // Check if a warning for missing aliased files should be displayed
    if (gAudioIO->ShouldShowMissingAliasedFileWarning()) {
-      wxString errorMessage = _(
+      if (gAudioIO->GetMissingAliasFileDialog()) {
+         // if it is already shown, just bring it to the front instead of
+         // creating a new one.
+         gAudioIO->GetMissingAliasFileDialog()->Raise();
+      } else {
+         wxString errorMessage = _(
 "One or more external audio files could not be found.\n\
 It is possible they were moved, deleted, or the drive they \
 were on was unmounted.\n\
 Silence is being substituted for the affected audio.\n\
 Choose File > Check Dependencies to view the \
 original location of the missing files.");
-      ShowModelessErrorDialog(this, _("Files Missing"),
-                 errorMessage, wxT(""), true);
-      // Only show this warning once per playback.
+         ShowAliasMissingDialog(this, _("Files Missing"),
+                  errorMessage, wxT(""), true);
+         // Only show this warning once per playback.
+      }
       gAudioIO->SetMissingAliasedFileWarningShouldShow(false);
    }
 

src/widgets/ErrorDialog.cpp

@@ -35,6 +35,9 @@ Gives an Error message with an option for help.
 #include "../Internat.h"
 #include "../Project.h"
 #include "../Prefs.h"
+#include "../AudioIO.h"
+
+
 
 class ErrorDialog : public wxDialog
 {
@@ -46,6 +49,8 @@ class ErrorDialog : public wxDialog
       const wxString & helpURL,
       const bool Close = true, const bool modal = true);
 
+   virtual ~ErrorDialog(){}
+
 private:
 	wxString dhelpURL;
    bool dClose;
@@ -57,11 +62,39 @@ private:
 	   
 };
 
+// special case for alias missing dialog because we keep track of if it exists.
+class AliasedFileMissingDialog : public ErrorDialog
+{
+   public:
+   AliasedFileMissingDialog(wxWindow *parent, 
+      const wxString & dlogTitle, 
+      const wxString & message, 
+      const wxString & helpURL,
+      const bool Close = true, const bool modal = true);
+   virtual ~AliasedFileMissingDialog();
+};
+
 BEGIN_EVENT_TABLE(ErrorDialog, wxDialog)
    EVT_BUTTON( wxID_OK, ErrorDialog::OnOk)
    EVT_BUTTON( wxID_HELP, ErrorDialog::OnHelp)
 END_EVENT_TABLE()
 
+
+AliasedFileMissingDialog::AliasedFileMissingDialog(wxWindow *parent, 
+      const wxString & dlogTitle, 
+      const wxString & message, 
+      const wxString & helpURL,
+      const bool Close, const bool modal):
+ErrorDialog(parent, dlogTitle, message, helpURL, Close, modal)
+{
+   gAudioIO->SetMissingAliasFileDialog(this);
+}
+
+AliasedFileMissingDialog::~AliasedFileMissingDialog()
+{
+   gAudioIO->SetMissingAliasFileDialog(NULL);
+}
+
 ErrorDialog::ErrorDialog(
    wxWindow *parent, 
    const wxString & dlogTitle, 
@@ -272,6 +305,27 @@ void ShowModelessErrorDialog(wxWindow *parent,
    dlog->Show();
 }
 
+void ShowAliasMissingDialog(wxWindow *parent,
+                     const wxString &dlogTitle,
+                     const wxString &message, 
+                     const wxString &helpURL,
+                     const bool Close)
+{
+   ErrorDialog *dlog = new AliasedFileMissingDialog(parent, dlogTitle, message, helpURL, Close, false);
+   // Don't center because in many cases (effect, export, etc) there will be a progress bar in the center that blocks this.
+   // instead put it just above or on the top of the project.
+   wxPoint point;
+   point.x = 0;
+   
+   point.y = parent ? parent->GetPosition().y - 200 : 100;
+   
+   if (point.y < 100)
+      point.y = 100;
+   dlog->SetPosition(point);
+   dlog->CentreOnParent(wxHORIZONTAL);
+   
+   dlog->Show();
+}
 
 /// Mostly we use this so that we have the code for resizability
 /// in one place.  Other considerations like screen readers are also

src/widgets/ErrorDialog.h

@@ -30,6 +30,13 @@ void ShowModelessErrorDialog(wxWindow *parent,
                      const wxString &helpURL,
                      bool Close = true);
 
+/// Displays a custom modeless error dialog for aliased file errors
+void ShowAliasMissingDialog(wxWindow *parent,
+                     const wxString &dlogTitle,
+                     const wxString &message, 
+                     const wxString &helpURL,
+                     const bool Close = true);
+
 /// Displays cutable information in a text ctrl, with an OK button.
 void ShowInfoDialog( wxWindow *parent,
                      const wxString &dlogTitle,