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Throw an error message when trying to link nodes that are already linked.
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1 changed files with 10 additions and 0 deletions
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@ -26,6 +26,8 @@
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#include "expression_node.h"
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#include "expression_link.h"
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#include <QMessageBox>
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ExpressionEditor::ExpressionEditor( QWidget *parent ) :
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QWidget( parent )
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{
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@ -113,6 +115,14 @@ void ExpressionEditor::onLinkItems()
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ExpressionNode *from = static_cast< ExpressionNode* >( l[ 0 ] );
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ExpressionNode *to = static_cast< ExpressionNode* >( l[ 1 ] );
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if( ( from->link() != NULL ) || ( to->link() != NULL ) )
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{
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QMessageBox::information( this,
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tr( "Failed to link nodes" ),
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tr( "Unfortunately those nodes are already linked." ) );
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return;
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}
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ExpressionLink *link = new ExpressionLink();
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link->link( from, to );
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