studio/src/plugins/gui_editor/expression_link.cpp

   1 // Ryzom Core Studio - GUI Editor Plugin
   2 //
   3 // Copyright (C) 2010-2014  Laszlo KIS-ADAM (dfighter) <dfighter1985@gmail.com>
   4 //
   5 // This program is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU Affero General Public License as
   7 // published by the Free Software Foundation, either version 3 of the
   8 // License, or (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU Affero General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU Affero General Public License
  16 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 #include "expression_link.h"
  19 #include "expression_node.h"
  20 #include <QGraphicsItem>
  21 #include <QPen>
  22
  23 ExpressionLink::ExpressionLink( QGraphicsItem *parent ) :
  24 QGraphicsLineItem( parent )
  25 {
  26         m_from = NULL;
  27         m_to = NULL;
  28 }
  29
  30 ExpressionLink::~ExpressionLink()
  31 {
  32         unlink();
  33 }
  34
  35 void ExpressionLink::link( ExpressionNode *from, ExpressionNode *to, int fromSlot, int toSlot )
  36 {
  37         m_from = from;
  38         m_to = to;
  39         m_from->setLink( this, fromSlot );
  40         m_to->setLink( this, toSlot );
  41
  42         m_fromSlot = fromSlot;
  43         m_toSlot = toSlot;
  44
  45         nodeMoved();
  46 }
  47
  48 void ExpressionLink::unlink()
  49 {
  50         if( m_from == NULL )
  51                 return;
  52
  53         m_from->setLink( NULL, m_fromSlot );
  54         m_to->setLink( NULL, m_toSlot );
  55
  56         m_from = NULL;
  57         m_to = NULL;
  58
  59         delete this;
  60 }
  61
  62 void ExpressionLink::nodeMoved()
  63 {
  64         setLine( QLineF( m_from->slotPos( m_fromSlot ), m_to->slotPos( m_toSlot ) ) );
  65 }
  66
  67 void ExpressionLink::paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
  68 {
  69         QPen p;
  70         p.setColor( Qt::black );
  71         p.setWidth( 5 );
  72         setPen( p );
  73
  74         QGraphicsLineItem::paint( painter, option, widget );
  75 }
  76
  77