Expression can now be built.

code/studio/src/plugins/gui_editor/expression_editor.cpp

@@ -89,7 +89,6 @@ void ExpressionEditor::load()
 void ExpressionEditor::contextMenuEvent( QContextMenuEvent *e )
 {	
 	QMenu menu;
-
 	QAction *a = NULL;
 
 	if( m_selectionCount > 0 )
@@ -129,6 +128,11 @@ void ExpressionEditor::contextMenuEvent( QContextMenuEvent *e )
 		a = menu.addAction( "Unlink" );
 		connect( a, SIGNAL( triggered() ), this, SLOT( onUnLinkItems() ) );
 	}
+	else
+	{
+		a = menu.addAction( "Build expression" );
+		connect( a, SIGNAL( triggered() ), this, SLOT( onBuildExpression() ) );
+	}
 
 	menu.exec( e->globalPos() );
 }
@@ -295,6 +299,22 @@ void ExpressionEditor::onSetRoot()
 	node->setRoot( true );
 }
 
+void ExpressionEditor::onBuildExpression()
+{
+	if( m_pvt->m_root == NULL )
+	{
+		QMessageBox::information( this,
+									tr( "Building expression" ),
+									tr( "Failed to build expression: You must set a root node." ) );
+		return;
+	}
+
+	QString result = m_pvt->m_root->build();
+	QMessageBox::information( this,
+								tr( "Building expression" ),
+								tr( "The result is\n" ) + result  );
+}
+
 
 void ExpressionEditor::addExpression( const ExpressionInfo *info )
 {

code/studio/src/plugins/gui_editor/expression_editor.h

@@ -48,6 +48,7 @@ private Q_SLOTS:
 	void onChangeSlotCount();
 	void onChangeValue();
 	void onSetRoot();
+	void onBuildExpression();
 
 private:
 	void addExpression( const ExpressionInfo *info );

code/studio/src/plugins/gui_editor/expression_link.h

@@ -36,6 +36,9 @@ public:
 
 	void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget );
 
+	ExpressionNode* from() const{ return m_from; }
+	ExpressionNode* to() const{ return m_to; }
+
 private:
 	ExpressionNode *m_from;
 	ExpressionNode *m_to;

code/studio/src/plugins/gui_editor/expression_node.cpp

@@ -286,6 +286,41 @@ void ExpressionNode::setRoot( bool b )
 	update();
 }
 
+QString ExpressionNode::build() const
+{
+	QString result;
+
+	if( isValue() )
+		return m_value;
+
+	QStringList l = m_name.split( ' ' );
+	result = l[ 0 ];
+	result += "( ";
+
+	int c = m_links.count();
+	for( int i = 1; i < c; i++ )
+	{
+		ExpressionLink *link = m_links[ i ];
+		if( link == NULL )
+			continue;
+
+		ExpressionNode *node = NULL;
+
+		if( link->from() == this )
+			node = link->to();
+		else
+			node = link->from();
+
+		result += node->build();
+
+		if( i != ( c - 1 ) )
+			result += ", ";
+	}
+
+	result += " )";
+	return result;
+}
+
 void ExpressionNode::mouseMoveEvent( QGraphicsSceneMouseEvent *e )
 {
 	for( int i = 0; i < m_links.count(); i++ )

code/studio/src/plugins/gui_editor/expression_node.h

@@ -65,6 +65,8 @@ public:
 	void setIsValue( bool b ){ m_isValue = b; }
 	void setRoot( bool b );
 
+	QString build() const;
+
 protected:
 	void mouseMoveEvent( QGraphicsSceneMouseEvent *e );