Updated Qt connections to the new style qgis/QGIS-Enhancement-Proposa…

…ls#77

Changed isDeleteStyleFromDBSupported to isDeleteStyleFromDbSupported

python/core/qgsvectordataprovider.sip

@@ -408,10 +408,12 @@ class QgsVectorDataProvider : QgsDataProvider
     virtual bool isSaveAndLoadStyleToDBSupported() const;
 
     /**
-     * It returns false by default.
+     * Checks if the provider supports style removal
      * Must be implemented by providers that support delete styles from db returning true
+     * @note added in QGIS 3.0
+     * @return true if delete operation is supported by the provider
      */
-    virtual bool isDeleteStyleFromDBSupported() const;
+    virtual bool isDeleteStyleFromDbSupported() const;
 
     static QVariant convertValue( QVariant::Type type, const QString& value );
 

python/core/qgsvectorlayer.sip

@@ -685,7 +685,11 @@ class QgsVectorLayer : QgsMapLayer, QgsExpressionContextGenerator
     virtual QString getStyleFromDatabase( const QString& styleId, QString &msgError /Out/ );
 
     /**
-     * Will delete the named style corresponding to style id provided from the database
+     * Delete a style from the database
+     * @note added in QGIS 3.0
+     * @param styleId the provider's layer_styles table id of the style to delete
+     * @param msgError reference to string that will be updated with any error messages
+     * @return true in case of success
      */
     virtual bool deleteStyleFromDatabase( const QString& styleId, QString &msgError /Out/ );
 

src/app/qgsloadstylefromdbdialog.cpp

@@ -27,8 +27,6 @@ QgsLoadStyleFromDBDialog::QgsLoadStyleFromDBDialog( QWidget *parent )
 {
   setupUi( this );
   setWindowTitle( QStringLiteral( "Database styles manager" ) );
-  mSelectedStyleId = QLatin1String( "" );
-  mSelectedStyleName = QLatin1String( "" );
 
   mLoadButton->setDisabled( true );
   mDeleteButton->setDisabled( true );
@@ -42,13 +40,13 @@ QgsLoadStyleFromDBDialog::QgsLoadStyleFromDBDialog( QWidget *parent )
   mOthersTable->setSelectionBehavior( QTableWidget::SelectRows );
   mOthersTable->verticalHeader()->setVisible( false );
 
-  connect( mRelatedTable, SIGNAL( itemSelectionChanged() ), this, SLOT( relatedTableSelectionChanged() ) );
-  connect( mOthersTable, SIGNAL( itemSelectionChanged() ), this, SLOT( otherTableSelectionChanged() ) );
-  connect( mRelatedTable, SIGNAL( doubleClicked( QModelIndex ) ), this, SLOT( accept() ) );
-  connect( mOthersTable, SIGNAL( doubleClicked( QModelIndex ) ), this, SLOT( accept() ) );
-  connect( mCancelButton, SIGNAL( clicked() ), this, SLOT( reject() ) );
-  connect( mDeleteButton, SIGNAL( clicked() ), this, SLOT( deleteStyleFromDB() ) );
-  connect( mLoadButton, SIGNAL( clicked() ), this, SLOT( accept() ) );
+  connect( mRelatedTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onRelatedTableSelectionChanged );
+  connect( mOthersTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onOthersTableSelectionChanged );
+  connect( mRelatedTable, &QTableWidget::doubleClicked, this, &QDialog::accept );
+  connect( mOthersTable, &QTableWidget::doubleClicked, this, &QDialog::accept );
+  connect( mCancelButton, &QPushButton::clicked, this, &QDialog::reject );
+  connect( mLoadButton, &QPushButton::clicked, this, &QDialog::accept );
+  connect( mDeleteButton, &QPushButton::clicked, this, &QgsLoadStyleFromDBDialog::deleteStyleFromDB );
 
   setTabOrder( mRelatedTable, mOthersTable );
   setTabOrder( mOthersTable, mCancelButton );
@@ -57,7 +55,6 @@ QgsLoadStyleFromDBDialog::QgsLoadStyleFromDBDialog( QWidget *parent )
 
   QSettings settings;
   restoreGeometry( settings.value( QStringLiteral( "/Windows/loadStyleFromDb/geometry" ) ).toByteArray() );
-
 }
 
 QgsLoadStyleFromDBDialog::~QgsLoadStyleFromDBDialog()
@@ -110,40 +107,45 @@ QString QgsLoadStyleFromDBDialog::getSelectedStyleId()
 void QgsLoadStyleFromDBDialog::setLayer( QgsVectorLayer *l )
 {
   mLayer = l;
-  if ( mLayer->dataProvider()->isDeleteStyleFromDBSupported() )
-  {
-    //QgsDebugMsg( "QgsLoadStyleFromDBDialog::setLayer → The dataProvider supports isDeleteStyleFromDBSupported" );
-    mDeleteButton->setVisible( true );
-  }
-  else
-  {
-    // QgsDebugMsg( "QgsLoadStyleFromDBDialog::setLayer → The dataProvider does not supports isDeleteStyleFromDBSupported" );
-    mDeleteButton->setVisible( false );
-  }
+  mDeleteButton->setVisible( mLayer->dataProvider()->isDeleteStyleFromDbSupported() );
 }
 
-void QgsLoadStyleFromDBDialog::relatedTableSelectionChanged()
+void QgsLoadStyleFromDBDialog::onRelatedTableSelectionChanged()
 {
   selectionChanged( mRelatedTable );
-  //deselect any other row on the other table widget
-  QTableWidgetSelectionRange range( 0, 0, mOthersTable->rowCount() - 1, mOthersTable->columnCount() - 1 );
-  mOthersTable->setRangeSelected( range, false );
+  if ( mRelatedTable->selectionModel()->hasSelection() )
+  {
+    if ( mOthersTable->selectionModel()->hasSelection() )
+    {
+      disconnect( mOthersTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onOthersTableSelectionChanged );
+      QTableWidgetSelectionRange range( 0, 0, mOthersTable->rowCount() - 1, mOthersTable->columnCount() - 1 );
+      mOthersTable->setRangeSelected( range, false );
+      connect( mOthersTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onOthersTableSelectionChanged );
+    }
+  }
 }
 
-void QgsLoadStyleFromDBDialog::otherTableSelectionChanged()
+void QgsLoadStyleFromDBDialog::onOthersTableSelectionChanged()
 {
   selectionChanged( mOthersTable );
-  //deselect any other row on the other table widget
-  QTableWidgetSelectionRange range( 0, 0, mRelatedTable->rowCount() - 1, mRelatedTable->columnCount() - 1 );
-  mRelatedTable->setRangeSelected( range, false );
+  if ( mOthersTable->selectionModel()->hasSelection() )
+  {
+    if ( mRelatedTable->selectionModel()->hasSelection() )
+    {
+      disconnect( mRelatedTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onRelatedTableSelectionChanged );
+      QTableWidgetSelectionRange range( 0, 0, mRelatedTable->rowCount() - 1, mRelatedTable->columnCount() - 1 );
+      mRelatedTable->setRangeSelected( range, false );
+      connect( mRelatedTable->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsLoadStyleFromDBDialog::onRelatedTableSelectionChanged );
+    }
+  }
 }
 
 void QgsLoadStyleFromDBDialog::selectionChanged( QTableWidget *styleTable )
 {
   QTableWidgetItem *item;
   QList<QTableWidgetItem *> selected = styleTable->selectedItems();
 
-  if ( selected.count() > 0 )
+  if ( !selected.isEmpty() )
   {
     item = selected.at( 0 );
     mSelectedStyleName = item->text();
@@ -153,27 +155,24 @@ void QgsLoadStyleFromDBDialog::selectionChanged( QTableWidget *styleTable )
   }
   else
   {
-    mSelectedStyleName = "";
-    mSelectedStyleId = "";
+    mSelectedStyleName.clear();
+    mSelectedStyleId.clear();
     mLoadButton->setEnabled( false );
     mDeleteButton->setEnabled( false );
   }
 }
 
 void QgsLoadStyleFromDBDialog::deleteStyleFromDB()
 {
-  QString uri, msgError;
+  QString msgError;
   QString opInfo = QObject::tr( "Delete style %1 from %2" ).arg( mSelectedStyleName, mLayer->providerType() );
 
   if ( QMessageBox::question( nullptr, QObject::tr( "Delete style" ),
                               QObject::tr( "Are you sure you want to delete the style %1?" ).arg( mSelectedStyleName ),
                               QMessageBox::Yes | QMessageBox::No, QMessageBox::No ) != QMessageBox::Yes )
     return;
 
-  uri = mLayer->dataProvider()->dataSourceUri();
-  //  mLayer->dataProvider()->deleteStyleById( uri, mSelectedStyleId, msgError );
   mLayer->deleteStyleFromDatabase( mSelectedStyleId, msgError );
-
   if ( !msgError.isNull() )
   {
     QgsDebugMsg( opInfo + " failed." );

src/app/qgsloadstylefromdbdialog.h

@@ -27,7 +27,6 @@ class APP_EXPORT QgsLoadStyleFromDBDialog : public QDialog, private Ui::QgsLoadS
     QString mSelectedStyleId;
     QString mSelectedStyleName;
     int mSectionLimit;
-    QString qmlStyle;
     Q_OBJECT
   public:
     explicit QgsLoadStyleFromDBDialog( QWidget *parent = nullptr );
@@ -37,16 +36,15 @@ class APP_EXPORT QgsLoadStyleFromDBDialog : public QDialog, private Ui::QgsLoadS
     void initializeLists( const QStringList& ids, const QStringList& names, const QStringList& descriptions, int sectionLimit );
     QString getSelectedStyleId();
     void selectionChanged( QTableWidget *styleTable );
-
     void setLayer( QgsVectorLayer *l );
 
   public slots:
-    void relatedTableSelectionChanged();
-    void otherTableSelectionChanged();
+    void onRelatedTableSelectionChanged();
+    void onOthersTableSelectionChanged();
     void deleteStyleFromDB();
 
   private:
-    QgsVectorLayer *mLayer;
+    QgsVectorLayer *mLayer = nullptr;
 
 };
 

src/core/qgsvectordataprovider.cpp

@@ -695,7 +695,7 @@ bool QgsVectorDataProvider::isSaveAndLoadStyleToDBSupported() const
   return false;
 }
 
-bool QgsVectorDataProvider::isDeleteStyleFromDBSupported() const
+bool QgsVectorDataProvider::isDeleteStyleFromDbSupported() const
 {
   return false;
 }

src/core/qgsvectordataprovider.h

@@ -474,7 +474,7 @@ class CORE_EXPORT QgsVectorDataProvider : public QgsDataProvider
      * It returns false by default.
      * Must be implemented by providers that support delete styles from db returning true
      */
-    virtual bool isDeleteStyleFromDBSupported() const;
+    virtual bool isDeleteStyleFromDbSupported() const;
 
     static QVariant convertValue( QVariant::Type type, const QString& value );
 

src/core/qgsvectorlayer.cpp

@@ -4343,22 +4343,19 @@ QString QgsVectorLayer::getStyleFromDatabase( const QString& styleId, QString &m
 
 bool QgsVectorLayer::deleteStyleFromDatabase( const QString& styleId, QString &msgError )
 {
-  QgsProviderRegistry * pReg = QgsProviderRegistry::instance();
-  QLibrary *myLib = pReg->providerLibrary( mProviderKey );
+  QLibrary *myLib = QgsProviderRegistry::instance()->providerLibrary( mProviderKey );
   if ( !myLib )
   {
     msgError = QObject::tr( "Unable to load %1 provider" ).arg( mProviderKey );
     return false;
   }
   deleteStyleById_t* deleteStyleByIdMethod = reinterpret_cast< deleteStyleById_t * >( cast_to_fptr( myLib->resolve( "deleteStyleById" ) ) );
-
   if ( !deleteStyleByIdMethod )
   {
     delete myLib;
     msgError = QObject::tr( "Provider %1 has no %2 method" ).arg( mProviderKey, QStringLiteral( "deleteStyleById" ) );
     return false;
   }
-
   return deleteStyleByIdMethod( mDataSource, styleId, msgError );
 }
 

src/core/qgsvectorlayer.h

@@ -786,7 +786,11 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
     virtual QString getStyleFromDatabase( const QString& styleId, QString &msgError );
 
     /**
-     * Will delete the named style corresponding to style id provided from the database
+     * Delete a style from the database
+     * @note added in QGIS 3.0
+     * @param styleId the provider's layer_styles table id of the style to delete
+     * @param msgError reference to string that will be updated with any error messages
+     * @return true in case of success
      */
     virtual bool deleteStyleFromDatabase( const QString& styleId, QString &msgError );
 

src/providers/postgres/qgspostgresprovider.h

@@ -132,7 +132,7 @@ class QgsPostgresProvider : public QgsVectorDataProvider
     virtual void enumValues( int index, QStringList& enumList ) const override;
     bool isValid() const override;
     virtual bool isSaveAndLoadStyleToDBSupported() const override { return true; }
-    virtual bool isDeleteStyleFromDBSupported() const override { return true; }
+    virtual bool isDeleteStyleFromDbSupported() const override { return true; }
     QgsAttributeList attributeIndexes() const override;
     QgsAttributeList pkAttributeIndexes() const override { return mPrimaryKeyAttrs; }
     QString defaultValueClause( int fieldId ) const override;

tests/src/python/test_provider_postgres.py

@@ -645,7 +645,7 @@ def testStyle(self):
         vl = self.getEditableLayer()
         self.assertTrue(vl.isValid())
         self.assertTrue(vl.dataProvider().isSaveAndLoadStyleToDBSupported())
-        self.assertTrue(vl.dataProvider().isDeleteStyleFromDBSupported())
+        self.assertTrue(vl.dataProvider().isDeleteStyleFromDbSupported())
 
         # table layer_styles does not exit
         related_count, idlist, namelist, desclist, errmsg = vl.listStylesInDatabase()