fixed crash when adding an effect although none is selected and improved overall usability

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@954 0778d3d1-df1d-0410-868b-ea421aaaa00d

ChangeLog

@@ -1,5 +1,11 @@
 2008-05-04	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
+	* include/effect_select_dialog.h:
+	* include/plugin.h:
+	* src/gui/effect_select_dialog.cpp:
+	fixed crash when adding an effect although none is selected and
+	improved overall usability
+
 	* plugins/organic/organic.cpp:
 	fixed knob-inheritance problems
 

include/effect_select_dialog.h

@@ -76,19 +76,14 @@ public:
 
 signals:
 	void highlighted( const effectKey & _key );
-	void addPlugin( const effectKey & _key );
 	void doubleClicked( const effectKey & _key );
 	
 
-protected:
-	virtual void resizeEvent( QResizeEvent * );
-
-
 protected slots:
 	void rowChanged( const QModelIndex &, const QModelIndex & );
-	void onAddButtonReleased( void );
 	void onDoubleClicked( const QModelIndex & );
-	
+	void updateSelection( void );
+
 
 private:
 	QVector<plugin::descriptor> m_pluginDescriptors;

include/plugin.h

@@ -108,18 +108,28 @@ public:
 						user = l[1];
 					}
 				}
+
 				inline QString dumpBase64( void ) const
 				{
 					return( base64::encode(
 						QList<QVariant>()
 							<< name << user ) );
 				}
+
+				inline bool isValid( void ) const
+				{
+					return( desc != NULL &&
+							name != QString::null );
+				}
+
 				plugin::descriptor * desc;
 				QString name;
 				QVariant user;
 			};
+
 			typedef QList<key> keyList;
 
+
 			subPluginFeatures( plugin::PluginTypes _type ) :
 				m_type( _type )
 			{

src/gui/effect_select_dialog.cpp

@@ -125,7 +125,10 @@ void effectSelectDialog::setSelection( const effectKey & _selection )
 
 void effectSelectDialog::selectPlugin( void )
 {
-	accept();
+	if( m_currentSelection.isValid() )
+	{
+		accept();
+	}
 }
 
 
@@ -194,6 +197,8 @@ effectListWidget::effectListWidget( QWidget * _parent ) :
 	m_filterEdit = new QLineEdit( this );
 	connect( m_filterEdit, SIGNAL( textChanged( const QString & ) ),
 		&m_model, SLOT( setFilterRegExp( const QString & ) ) );
+	connect( m_filterEdit, SIGNAL( textChanged( const QString & ) ),
+					this, SLOT( updateSelection() ) );
 
 	m_pluginList = new QListView( this );
 	m_pluginList->setModel( &m_model );
@@ -228,11 +233,7 @@ effectListWidget::effectListWidget( QWidget * _parent ) :
 	vboxl->addWidget( m_pluginList );
 	vboxl->addWidget( groupbox );
 
-	if( m_sourceModel.rowCount() > 0 )
-	{
-//		m_pluginList->setCurrentRow( 0 );
-		//rowChanged( 0 );
-	}
+	updateSelection();
 }
 
 
@@ -253,10 +254,15 @@ void effectListWidget::rowChanged( const QModelIndex & _idx,
 
 	if( m_model.mapToSource( _idx ).row() < 0 )
 	{
-		return;
+		// invalidate current selection
+		m_currentSelection =
+				plugin::descriptor::subPluginFeatures::key();
+	}
+	else
+	{
+		m_currentSelection =
+				m_effectKeys[m_model.mapToSource( _idx ).row()];
 	}
-
-	m_currentSelection = m_effectKeys[m_model.mapToSource( _idx ).row()];
 	if( m_currentSelection.desc &&
 				m_currentSelection.desc->sub_plugin_features )
 	{
@@ -286,6 +292,7 @@ void effectListWidget::rowChanged( const QModelIndex & _idx,
 
 
 
+
 void effectListWidget::onDoubleClicked( const QModelIndex & )
 {
 	emit( doubleClicked( m_currentSelection ) );
@@ -294,22 +301,19 @@ void effectListWidget::onDoubleClicked( const QModelIndex & )
 
 
 
-void effectListWidget::onAddButtonReleased()
+void effectListWidget::updateSelection( void )
 {
-	emit( addPlugin( m_currentSelection ) );
+	// no valid selection anymore due to changed filter?
+	if( m_pluginList->selectionModel()->selection().size() <= 0 )
+	{
+		// then select our first item
+		m_pluginList->selectionModel()->select( m_model.index( 0, 0 ),
+					QItemSelectionModel::ClearAndSelect );
+		rowChanged( m_model.index( 0, 0 ), QModelIndex() );
+	}
 }
 
 
-
-
-void effectListWidget::resizeEvent( QResizeEvent * )
-{
-	//m_descriptionWidget->setFixedWidth( width() - 40 );
-}
-
-
-
-
 #include "effect_select_dialog.moc"
 
 #endif