A root node can now be set. The root node is where the evaluation will start.

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

@@ -35,7 +35,14 @@
 class ExpressionEditorPvt
 {
 public:
+
+	ExpressionEditorPvt()
+	{
+		m_root = NULL;
+	}
+
 	ExpressionStore store;
+	ExpressionNode *m_root;
 };
 
 ExpressionEditor::ExpressionEditor( QWidget *parent ) :
@@ -101,12 +108,15 @@ void ExpressionEditor::contextMenuEvent( QContextMenuEvent *e )
 					a = menu.addAction( "Change slot count" );
 					connect( a, SIGNAL( triggered() ), this, SLOT( onChangeSlotCount() ) );
 				}
-
+				else
 				if( node->isValue() )
 				{
 					a = menu.addAction( "Change value" );
 					connect( a, SIGNAL( triggered() ), this, SLOT( onChangeValue() ) );
 				}
+
+				a = menu.addAction( "Set as root" );
+				connect( a, SIGNAL( triggered() ), this, SLOT( onSetRoot() ) );
 			}
 		}
 		else
@@ -273,6 +283,19 @@ void ExpressionEditor::onChangeValue()
 	node->setValue( newValue );
 }
 
+void ExpressionEditor::onSetRoot()
+{
+	QList< QGraphicsItem* > l = m_scene->selectedItems();
+	ExpressionNode *node = static_cast< ExpressionNode* >( l[ 0 ] );
+
+	if( m_pvt->m_root != NULL )
+		m_pvt->m_root->setRoot( false );
+
+	m_pvt->m_root = node;
+	node->setRoot( true );
+}
+
+
 void ExpressionEditor::addExpression( const ExpressionInfo *info )
 {
 	QTreeWidgetItem *item = findTopLevelItem( info->category );

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

@@ -47,6 +47,7 @@ private Q_SLOTS:
 	void onItemDblClicked( QTreeWidgetItem *item );
 	void onChangeSlotCount();
 	void onChangeValue();
+	void onSetRoot();
 
 private:
 	void addExpression( const ExpressionInfo *info );

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

@@ -107,6 +107,7 @@ QGraphicsItem( parent )
 
 	m_variable = false;
 	m_isValue = false;
+	m_isRoot = false;
 
 	m_name = name;
 
@@ -139,9 +140,18 @@ void ExpressionNode::paint( QPainter *painter, const QStyleOptionGraphicsItem *o
 	header.setHeight( m_hh );
 
 	// Draw filled rectangle, header
+	if( !m_isRoot )
+	{
 		c.setRed( 44 );
 		c.setGreen( 169 );
 		c.setBlue( 232 );
+	}
+	else
+	{
+		c.setRed( 255 );
+		c.setGreen( 0 );
+		c.setBlue( 0 );
+	}
 	br.setColor( c );
 	br.setStyle( Qt::SolidPattern );
 	p.setColor( c );
@@ -270,6 +280,12 @@ void ExpressionNode::setValue( const QString &value )
 	update();
 }
 
+void ExpressionNode::setRoot( bool b )
+{
+	m_isRoot = b;
+	update();
+}
+
 void ExpressionNode::mouseMoveEvent( QGraphicsSceneMouseEvent *e )
 {
 	for( int i = 0; i < m_links.count(); i++ )

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

@@ -63,6 +63,7 @@ public:
 
 	bool isValue() const{ return m_isValue; }
 	void setIsValue( bool b ){ m_isValue = b; }
+	void setRoot( bool b );
 
 protected:
 	void mouseMoveEvent( QGraphicsSceneMouseEvent *e );
@@ -84,6 +85,7 @@ private:
 
 	QString m_value;
 	bool m_isValue;
+	bool m_isRoot;
 };
 
 #endif