Share QgsBrowserModel among browser instances

python/core/qgsbrowsermodel.sip

@@ -175,6 +175,17 @@ Reload the whole model
     void hidePath( QgsDataItem *item );
 %Docstring
 Hide the given path in the browser model
+%End
+
+    bool initialized( );
+%Docstring
+Returns true if the model has been initialized
+ :rtype: bool
+%End
+
+    void init();
+%Docstring
+Delayied initialization
 %End
 
   protected:
@@ -184,6 +195,7 @@ Populates the model
 %End
     void removeRootItems();
 
+
 };
 
 /************************************************************************

python/gui/qgsbrowserdockwidget.sip

@@ -21,7 +21,7 @@ class QgsBrowserDockWidget : QgsDockWidget
 %End
   public:
 
-    explicit QgsBrowserDockWidget( const QString &name, QWidget *parent /TransferThis/ = 0 );
+    explicit QgsBrowserDockWidget( const QString &name, QgsBrowserModel *model, QWidget *parent /TransferThis/ = 0 );
 %Docstring
  Constructor for QgsBrowserDockWidget
  \param name name of the widget

src/app/qgisapp.cpp

@@ -78,6 +78,7 @@
 #include "qgslayerstylingwidget.h"
 #include "qgstaskmanager.h"
 #include "qgsziputils.h"
+#include "qgsbrowsermodel.h"
 
 #include <QNetworkReply>
 #include <QNetworkProxy>
@@ -866,7 +867,8 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
   }
   endProfile();
 
-  mBrowserWidget = new QgsBrowserDockWidget( tr( "Browser Panel" ), this );
+  mBrowserModel = new QgsBrowserModel( this );
+  mBrowserWidget = new QgsBrowserDockWidget( tr( "Browser Panel" ), mBrowserModel, this );
   mBrowserWidget->setObjectName( QStringLiteral( "Browser" ) );
   addDockWidget( Qt::LeftDockWidgetArea, mBrowserWidget );
   mBrowserWidget->hide();
@@ -876,7 +878,7 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
   connect( mBrowserWidget, &QgsBrowserDockWidget::openFile, this, &QgisApp::openFile );
   connect( mBrowserWidget, &QgsBrowserDockWidget::handleDropUriList, this, &QgisApp::handleDropUriList );
 
-  mBrowserWidget2 = new QgsBrowserDockWidget( tr( "Browser Panel (2)" ), this );
+  mBrowserWidget2 = new QgsBrowserDockWidget( tr( "Browser Panel (2)" ), mBrowserModel, this );
   mBrowserWidget2->setObjectName( QStringLiteral( "Browser2" ) );
   addDockWidget( Qt::LeftDockWidgetArea, mBrowserWidget2 );
   mBrowserWidget2->hide();
@@ -1509,7 +1511,7 @@ void QgisApp::dataSourceManager( const QString &pageName )
 {
   if ( ! mDataSourceManagerDialog )
   {
-    mDataSourceManagerDialog = new QgsDataSourceManagerDialog( this, mapCanvas() );
+    mDataSourceManagerDialog = new QgsDataSourceManagerDialog( mBrowserModel, this, mapCanvas() );
     // Forward signals to this
     connect( this, &QgisApp::connectionsChanged, mDataSourceManagerDialog, &QgsDataSourceManagerDialog::refresh );
     connect( mDataSourceManagerDialog, &QgsDataSourceManagerDialog::connectionsChanged, this, &QgisApp::connectionsChanged );

src/app/qgisapp.h

@@ -123,6 +123,8 @@ class QgsLayerStylingWidget;
 class QgsDiagramProperties;
 class QgsLocatorWidget;
 class QgsDataSourceManagerDialog;
+class QgsBrowserModel;
+
 
 #include <QMainWindow>
 #include <QToolBar>
@@ -2074,6 +2076,8 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     QTimer mRenderProgressBarTimer;
     QMetaObject::Connection mRenderProgressBarTimerConnection;
 
+    QgsBrowserModel *mBrowserModel = nullptr;
+
     friend class TestQgisAppPython;
 };
 

src/core/qgsbrowsermodel.cpp

@@ -45,9 +45,6 @@ QgsBrowserModel::QgsBrowserModel( QObject *parent )
   : QAbstractItemModel( parent )
 
 {
-  connect( QgsProject::instance(), &QgsProject::readProject, this, &QgsBrowserModel::updateProjectHome );
-  connect( QgsProject::instance(), &QgsProject::writeProject, this, &QgsBrowserModel::updateProjectHome );
-  addRootItems();
 }
 
 QgsBrowserModel::~QgsBrowserModel()
@@ -172,6 +169,17 @@ void QgsBrowserModel::removeRootItems()
   mRootItems.clear();
 }
 
+void QgsBrowserModel::init()
+{
+  if ( ! mInitialized )
+  {
+    connect( QgsProject::instance(), &QgsProject::readProject, this, &QgsBrowserModel::updateProjectHome );
+    connect( QgsProject::instance(), &QgsProject::writeProject, this, &QgsBrowserModel::updateProjectHome );
+    addRootItems();
+    mInitialized = true;
+  }
+}
+
 
 Qt::ItemFlags QgsBrowserModel::flags( const QModelIndex &index ) const
 {

src/core/qgsbrowsermodel.h

@@ -167,6 +167,12 @@ class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
     //! Hide the given path in the browser model
     void hidePath( QgsDataItem *item );
 
+    //! Returns true if the model has been initialized
+    bool initialized( ) { return mInitialized;  }
+
+    //! Delayied initialization
+    void init();
+
   protected:
     //! Populates the model
     void addRootItems();
@@ -175,6 +181,9 @@ class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
     QVector<QgsDataItem *> mRootItems;
     QgsFavoritesItem *mFavorites = nullptr;
     QgsDirectoryItem *mProjectHome = nullptr;
+
+  private:
+    bool mInitialized = false;
 };
 
 #endif // QGSBROWSERMODEL_H

src/gui/qgsbrowserdockwidget.cpp

@@ -38,8 +38,10 @@
 
 #include <QDragEnterEvent>
 
-QgsBrowserDockWidget::QgsBrowserDockWidget( const QString &name, QWidget *parent )
+QgsBrowserDockWidget::QgsBrowserDockWidget( const QString &name, QgsBrowserModel *model, QWidget *parent )
   : QgsDockWidget( parent )
+  , mModel( model )
+  , mProxyModel( nullptr )
   , mPropertiesWidgetEnabled( false )
   , mPropertiesWidgetHeight( 0 )
 {
@@ -110,9 +112,12 @@ QgsBrowserDockWidget::~QgsBrowserDockWidget()
 void QgsBrowserDockWidget::showEvent( QShowEvent *e )
 {
   // delayed initialization of the model
-  if ( !mModel )
+  if ( !mModel->initialized( ) )
+  {
+    mModel->init();
+  }
+  if ( ! mProxyModel )
   {
-    mModel = new QgsBrowserModel( mBrowserView );
     mProxyModel = new QgsBrowserTreeFilterProxyModel( this );
     mProxyModel->setBrowserModel( mModel );
     mBrowserView->setSettingsSection( objectName().toLower() ); // to distinguish 2 or more instances of the browser

src/gui/qgsbrowserdockwidget.h

@@ -49,7 +49,7 @@ class GUI_EXPORT QgsBrowserDockWidget : public QgsDockWidget, private Ui::QgsBro
       * \param name name of the widget
       * \param parent parent widget
       */
-    explicit QgsBrowserDockWidget( const QString &name, QWidget *parent SIP_TRANSFERTHIS = nullptr );
+    explicit QgsBrowserDockWidget( const QString &name, QgsBrowserModel *model, QWidget *parent SIP_TRANSFERTHIS = nullptr );
     ~QgsBrowserDockWidget();
     //! Add directory to favorites
     void addFavoriteDirectory( const QString &favDir );

src/gui/qgsdatasourcemanagerdialog.cpp

@@ -28,7 +28,7 @@
 #include "qgsmessagelog.h"
 #include "qgsgui.h"
 
-QgsDataSourceManagerDialog::QgsDataSourceManagerDialog( QWidget *parent, QgsMapCanvas *canvas, Qt::WindowFlags fl ) :
+QgsDataSourceManagerDialog::QgsDataSourceManagerDialog( QgsBrowserModel *&browserModel, QWidget *parent, QgsMapCanvas *canvas, Qt::WindowFlags fl ) :
   QgsOptionsDialogBase( QStringLiteral( "Data Source Manager" ), parent, fl ),
   ui( new Ui::QgsDataSourceManagerDialog ),
   mPreviousRow( -1 ),
@@ -48,7 +48,7 @@ QgsDataSourceManagerDialog::QgsDataSourceManagerDialog( QWidget *parent, QgsMapC
   connect( ui->mOptionsListWidget, &QListWidget::currentRowChanged, this, &QgsDataSourceManagerDialog::setCurrentPage );
 
   // BROWSER Add the browser widget to the first stacked widget page
-  mBrowserWidget = new QgsBrowserDockWidget( QStringLiteral( "Browser" ), this );
+  mBrowserWidget = new QgsBrowserDockWidget( QStringLiteral( "Browser" ), browserModel, this );
   mBrowserWidget->setFeatures( QDockWidget::NoDockWidgetFeatures );
   ui->mOptionsStackedWidget->addWidget( mBrowserWidget );
   mPageNames.append( QStringLiteral( "browser" ) );

src/gui/qgsdatasourcemanagerdialog.h

@@ -32,6 +32,7 @@ class QgsBrowserDockWidget;
 class QgsRasterLayer;
 class QgsMapCanvas;
 class QgsAbstractDataSourceWidget;
+class QgsBrowserModel;
 
 /** \ingroup gui
  * The QgsDataSourceManagerDialog class embeds the browser panel and all
@@ -52,7 +53,7 @@ class GUI_EXPORT QgsDataSourceManagerDialog : public QgsOptionsDialogBase, priva
       * \param canvas a pointer to the map canvas
       * \param fl window flags
       */
-    explicit QgsDataSourceManagerDialog( QWidget *parent = nullptr, QgsMapCanvas *canvas = nullptr, Qt::WindowFlags fl = QgsGuiUtils::ModalDialogFlags );
+    explicit QgsDataSourceManagerDialog( QgsBrowserModel *&browserModel, QWidget *parent = nullptr, QgsMapCanvas *canvas = nullptr, Qt::WindowFlags fl = QgsGuiUtils::ModalDialogFlags );
     ~QgsDataSourceManagerDialog();
 
     /**