Remember whether project file exists and don't continually recheck

nyalldawson · nyalldawson · commit a89dfde91b06 · 2017-10-26T07:13:55.000+11:00
Because that's slow for network paths. Instead only check once,
and add a menu option to refresh and force re-check
diff --git a/src/app/qgswelcomepage.cpp b/src/app/qgswelcomepage.cpp
@@ -121,16 +121,30 @@ void QgsWelcomePage::showContextMenuForProjects( QPoint point )
   if ( path.isEmpty() )
     return;
 
+  bool enabled = mModel->flags( index ) & Qt::ItemIsEnabled;
+
   QMenu *menu = new QMenu( this );
 
-  QAction *openFolderAction = new QAction( tr( "Open Directory…" ), menu );
-  connect( openFolderAction, &QAction::triggered, this, [this, path]
+  if ( enabled )
+  {
+    QAction *openFolderAction = new QAction( tr( "Open Directory…" ), menu );
+    connect( openFolderAction, &QAction::triggered, this, [this, path]
+    {
+      QFileInfo fi( path );
+      QString folder = fi.path();
+      QDesktopServices::openUrl( QUrl::fromLocalFile( folder ) );
+    } );
+    menu->addAction( openFolderAction );
+  }
+  else
   {
-    QFileInfo fi( path );
-    QString folder = fi.path();
-    QDesktopServices::openUrl( QUrl::fromLocalFile( folder ) );
-  } );
-  menu->addAction( openFolderAction );
+    QAction *rescanAction = new QAction( tr( "Refresh" ), menu );
+    connect( rescanAction, &QAction::triggered, this, [this, index]
+    {
+      mModel->recheckProject( index );
+    } );
+    menu->addAction( rescanAction );
+  }
 
   menu->popup( mapToGlobal( point ) );
 }
diff --git a/src/app/qgswelcomepageitemsmodel.cpp b/src/app/qgswelcomepageitemsmodel.cpp
@@ -201,8 +201,22 @@ Qt::ItemFlags QgsWelcomePageItemsModel::flags( const QModelIndex &index ) const
 
   const RecentProjectData &projectData = mRecentProjects.at( index.row() );
 
-  if ( !QFile::exists( ( projectData.path ) ) )
+  // This check can be slow for network based projects, so only run it the first time
+  if ( !projectData.checkedExists )
+  {
+    projectData.exists = QFile::exists( ( projectData.path ) );
+    projectData.checkedExists = true;
+  }
+
+  if ( !projectData.exists )
     flags &= ~Qt::ItemIsEnabled;
 
   return flags;
 }
+
+void QgsWelcomePageItemsModel::recheckProject( const QModelIndex &index )
+{
+  const RecentProjectData &projectData = mRecentProjects.at( index.row() );
+  projectData.exists = QFile::exists( ( projectData.path ) );
+  projectData.checkedExists = true;
+}
diff --git a/src/app/qgswelcomepageitemsmodel.h b/src/app/qgswelcomepageitemsmodel.h
@@ -50,6 +50,8 @@ class QgsWelcomePageItemsModel : public QAbstractListModel
       QString title;
       QString previewImagePath;
       QString crs;
+      mutable bool checkedExists = false;
+      mutable bool exists = false;
     };
 
     explicit QgsWelcomePageItemsModel( QObject *parent = nullptr );
@@ -60,6 +62,8 @@ class QgsWelcomePageItemsModel : public QAbstractListModel
     QVariant data( const QModelIndex &index, int role ) const override;
     Qt::ItemFlags flags( const QModelIndex &index ) const override;
 
+    void recheckProject( const QModelIndex &index );
+
   private:
     QList<RecentProjectData> mRecentProjects;
 };
