#1 approach to invalid file setting

app/localprojectsmanager.cpp

@@ -15,7 +15,7 @@
 #include <QDir>
 #include <QDirIterator>
 
-static QString findQgisProjectFile( const QString &projectDir )
+static QString findQgisProjectFile( const QString &projectDir, QString &err )
 {
   QList<QString> foundProjectFiles;
   QDirIterator it( projectDir, QStringList() << QStringLiteral( "*.qgs" ) << QStringLiteral( "*.qgz" ), QDir::Files, QDirIterator::Subdirectories );
@@ -28,10 +28,17 @@ static QString findQgisProjectFile( const QString &projectDir )
   {
     return foundProjectFiles.first();
   }
-  else if ( foundProjectFiles.count() > 1 ) // multiple projects
-    return QString( "ERR_MULTIPLE_PROJECTS" );
-  else // no projects
-    return QString( "ERR_NO_PROJECTS" );
+  else if ( foundProjectFiles.count() > 1 )
+  {
+    // error: multiple project files found
+    err = QString( "ERR_MULTIPLE_PROJECTS" );
+  }
+  else
+  {
+    // no projects
+    err = QString( "ERR_NO_PROJECTS" );
+  }
+  return QString();
 }
 
 
@@ -42,8 +49,11 @@ LocalProjectsManager::LocalProjectsManager( const QString &dataDir )
   for ( QString folderName : entryList )
   {
     LocalProjectInfo info;
+    QString err;
     info.projectDir = mDataDir + "/" + folderName;
-    info.qgisProjectFilePath = findQgisProjectFile( info.projectDir );
+    info.qgisProjectFilePath = findQgisProjectFile( info.projectDir, err );
+    if ( !err.isEmpty() )
+      info.setprojectFileError( err );
 
     MerginProjectMetadata metadata = MerginProjectMetadata::fromCachedJson( info.projectDir + "/" + MerginApi::sMetadataFile );
     if ( metadata.isValid() )
@@ -112,8 +122,11 @@ void LocalProjectsManager::updateProjectStatus( const QString &projectDir )
 void LocalProjectsManager::addMerginProject( const QString &projectDir, const QString &projectNamespace, const QString &projectName )
 {
   LocalProjectInfo project;
+  QString err;
   project.projectDir = projectDir;
-  project.qgisProjectFilePath = findQgisProjectFile( projectDir );
+  project.qgisProjectFilePath = findQgisProjectFile( projectDir, err );
+  if ( !err.isEmpty() )
+    project.setprojectFileError( err );
   project.projectNamespace = projectNamespace;
   project.projectName = projectName;
   // version info and status should be updated afterwards

app/localprojectsmanager.h

@@ -28,10 +28,17 @@ struct LocalProjectInfo
 {
   bool isValid() const { return !projectDir.isEmpty(); }
 
+  void setprojectFileError( const QString error ) { projectError = error; }
+
+  bool isShowable() const { return projectError.isEmpty(); }
+
   QString projectDir;  //!< full path to the project directory
 
   QString qgisProjectFilePath;  //!< path to the .qgs/.qgz file (or empty if not have exactly one such file)
 
+  QString projectError; //!< If project is invalid, projectError carry more information why
+  // TODO: reset when project is synchronized
+
   //
   // mergin-specific project info (may be empty)
   //

app/positiondirection.h

@@ -19,7 +19,7 @@
 
 
 /**
- * Utility class containing infortmation about the direction. Note that depends on availibility of sensors and their data.
+ * Utility class containing information about the direction. Note that depends on availibility of sensors and their data.
  *
  * Updates direction periodicly according timer while filtering small difference values between old and new direction angle.
  * Uses ground speed (in m/s) to select which direction source will be used - compass for smaller speed whereas positionKit direction

app/projectsmodel.cpp

@@ -47,20 +47,20 @@ void ProjectModel::findProjectFiles()
     projectFile.folderName = dir.dirName();
     projectFile.projectName = project.projectName;
     projectFile.projectNamespace = project.projectNamespace;
+    projectFile.isValid = project.isShowable();
     QDateTime created = fi.created().toUTC();   // TODO: why UTC ???
-    if ( !project.qgisProjectFilePath.startsWith( "ERR" ) )
+    if ( projectFile.isValid )
     {
       projectFile.info = QString( created.toString() );
-      projectFile.isValid = true;
     }
     else
     {
-      if ( project.qgisProjectFilePath.contains( "ERR_NO_PROJECTS" ) )
+      if ( project.projectError.contains( "ERR_NO_PROJECTS" ) )
         projectFile.info = tr( "Error: Missing QGIS project file" );
-      else if ( project.qgisProjectFilePath.contains( "ERR_MULTIPLE_PROJECTS" ) )
+      else if ( project.projectError.contains( "ERR_MULTIPLE_PROJECTS" ) )
         projectFile.info = tr( "Error: Multiple QGIS project files" );
-
-      projectFile.isValid = false;
+      else
+        projectFile.info = tr("Invalid project");
     }
     mProjectFiles << projectFile;
   }