[browser] Correctly show drives inserted (or removed!) after QGIS launch

Fixes #14481, #9843

python/core/auto_generated/qgsbrowsermodel.sip.in

@@ -129,6 +129,15 @@ notify the provider dialogs of a changed connection
 %Docstring
 Reload the whole model
 %End
+
+    void refreshDrives();
+%Docstring
+Refreshes the list of drive items, removing any corresponding to removed
+drives and adding newly added drives.
+
+.. versionadded:: 3.4
+%End
+
     void beginInsertItems( QgsDataItem *parent, int first, int last );
     void endInsertItems();
     void beginRemoveItems( QgsDataItem *parent, int first, int last );

src/app/qgisapp.cpp

@@ -1322,10 +1322,7 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
       QgsApplication::applicationName(),
       QgsApplication::organizationName(),
       Qgis::QGIS_VERSION );
-  connect( QgsGui::instance()->nativePlatformInterface(), &QgsNative::usbStorageNotification, this, [ = ]( const QString & path, bool inserted )
-  {
-    QgsDebugMsg( QStringLiteral( "USB STORAGE NOTIFICATION! %1 %2" ).arg( path ).arg( inserted ? QStringLiteral( "inserted" ) : QStringLiteral( "removed" ) ) );
-  } );
+  connect( QgsGui::instance()->nativePlatformInterface(), &QgsNative::usbStorageNotification, mBrowserModel, &QgsBrowserModel::refreshDrives );
 
   // setup application progress reports from task manager
   connect( QgsApplication::taskManager(), &QgsTaskManager::taskAdded, this, []

src/core/qgsbrowsermodel.cpp

@@ -107,13 +107,14 @@ void QgsBrowserModel::addRootItems()
   // add drives
   Q_FOREACH ( const QFileInfo &drive, QDir::drives() )
   {
-    QString path = drive.absolutePath();
+    const QString path = drive.absolutePath();
 
     if ( QgsDirectoryItem::hiddenPath( path ) )
       continue;
 
     QgsDirectoryItem *item = new QgsDirectoryItem( nullptr, path, path );
     item->setSortKey( QStringLiteral( " 3 %1" ).arg( path ) );
+    mDriveItems.insert( path, item );
 
     connectItem( item );
     mRootItems << item;
@@ -173,6 +174,7 @@ void QgsBrowserModel::removeRootItems()
   }
 
   mRootItems.clear();
+  mDriveItems.clear();
 }
 
 void QgsBrowserModel::initialize()
@@ -348,6 +350,54 @@ void QgsBrowserModel::reload()
   endResetModel();
 }
 
+void QgsBrowserModel::refreshDrives()
+{
+  const QList< QFileInfo > drives = QDir::drives();
+  // remove any removed drives
+  const QStringList existingDrives = mDriveItems.keys();
+  for ( const QString &drivePath : existingDrives )
+  {
+    bool stillExists = false;
+    for ( const QFileInfo &drive : drives )
+    {
+      if ( drivePath == drive.absolutePath() )
+      {
+        stillExists = true;
+        break;
+      }
+    }
+
+    if ( stillExists )
+      continue;
+
+    // drive has been removed, remove corresponding item
+    if ( QgsDataItem *driveItem = mDriveItems.value( drivePath ) )
+      removeRootItem( driveItem );
+  }
+
+  for ( const QFileInfo &drive : drives )
+  {
+    const QString path = drive.absolutePath();
+
+    if ( QgsDirectoryItem::hiddenPath( path ) )
+      continue;
+
+    // does an item for this drive already exist?
+    if ( !mDriveItems.contains( path ) )
+    {
+      QgsDirectoryItem *item = new QgsDirectoryItem( nullptr, path, path );
+      item->setSortKey( QStringLiteral( " 3 %1" ).arg( path ) );
+
+      mDriveItems.insert( path, item );
+      connectItem( item );
+
+      beginInsertRows( QModelIndex(), mRootItems.count(), mRootItems.count() );
+      mRootItems << item;
+      endInsertRows();
+    }
+  }
+}
+
 QModelIndex QgsBrowserModel::index( int row, int column, const QModelIndex &parent ) const
 {
   if ( column < 0 || column >= columnCount() || row < 0 )
@@ -576,10 +626,21 @@ void QgsBrowserModel::hidePath( QgsDataItem *item )
   }
   else
   {
-    int i = mRootItems.indexOf( item );
-    beginRemoveRows( QModelIndex(), i, i );
-    mRootItems.remove( i );
-    item->deleteLater();
-    endRemoveRows();
+    removeRootItem( item );
   }
 }
+
+
+void QgsBrowserModel::removeRootItem( QgsDataItem *item )
+{
+  int i = mRootItems.indexOf( item );
+  beginRemoveRows( QModelIndex(), i, i );
+  mRootItems.remove( i );
+  if ( !mDriveItems.key( item ).isEmpty() )
+  {
+    mDriveItems.remove( mDriveItems.key( item ) );
+  }
+  item->deleteLater();
+  endRemoveRows();
+}
+

src/core/qgsbrowsermodel.h

@@ -145,6 +145,15 @@ class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
   public slots:
     //! Reload the whole model
     void reload();
+
+    /**
+     * Refreshes the list of drive items, removing any corresponding to removed
+     * drives and adding newly added drives.
+     *
+     * \since QGIS 3.4
+     */
+    void refreshDrives();
+
     void beginInsertItems( QgsDataItem *parent, int first, int last );
     void endInsertItems();
     void beginRemoveItems( QgsDataItem *parent, int first, int last );
@@ -192,6 +201,9 @@ class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
 
   private:
     bool mInitialized = false;
+    QMap< QString, QgsDataItem * > mDriveItems;
+
+    void removeRootItem( QgsDataItem *item );
 };
 
 #endif // QGSBROWSERMODEL_H

src/native/mac/cocoainitializer.mm

@@ -41,10 +41,10 @@
 #include <AppKit/AppKit.h>
 #include <Cocoa/Cocoa.h>
 
-class CocoaInitializer::Private 
+class CocoaInitializer::Private
 {
   public:
-    NSAutoreleasePool* autoReleasePool_;
+    NSAutoreleasePool *autoReleasePool_;
 };
 
 CocoaInitializer::CocoaInitializer()