IECore::RunTimeTypedPtr GraphGadget::dragBegin( GadgetPtr gadget, const DragDropEvent &event )
{
if( !m_scriptNode )
{
return 0;
}
V3f i;
if( !event.line.intersect( Plane3f( V3f( 0, 0, 1 ), 0 ), i ) )
{
return 0;
}
m_dragMode = None;
m_dragStartPosition = m_lastDragPosition = V2f( i.x, i.y );
NodeGadget *nodeGadget = nodeGadgetAt( event.line );
if( event.buttons == ButtonEvent::Left )
{
if( nodeGadget && m_scriptNode->selection()->contains( nodeGadget->node() ) )
{
m_dragMode = Moving;
// we have to return an object to start the drag but the drag we're
// starting is for our purposes only, so we return an object that won't
// be accepted by any other drag targets.
return IECore::NullObject::defaultNullObject();
}
else if( !nodeGadget )
{
m_dragMode = Selecting;
return IECore::NullObject::defaultNullObject();
}
}
else if( event.buttons == ButtonEvent::Middle )
{
if( nodeGadget )
{
m_dragMode = Sending;
Pointer::setFromFile( "nodes.png" );
if( m_scriptNode->selection()->contains( nodeGadget->node() ) )
{
return m_scriptNode->selection();
}
else
{
return nodeGadget->node();
}
}
}
return 0;
}
bool GraphGadget::buttonPress( GadgetPtr gadget, const ButtonEvent &event )
{
if( event.buttons==ButtonEvent::Left )
{
// selection/deselection
if( !m_scriptNode )
{
return false;
}
ViewportGadget *viewportGadget = ancestor<ViewportGadget>();
std::vector<GadgetPtr> gadgetsUnderMouse;
viewportGadget->gadgetsAt(
viewportGadget->gadgetToRasterSpace( event.line.p0, this ),
gadgetsUnderMouse
);
if( !gadgetsUnderMouse.size() || gadgetsUnderMouse[0] == this )
{
// background click. clear selection unless shift is
// held, in which case we're expecting a shift drag
// to add to the selection.
if( !(event.modifiers & ButtonEvent::Shift) )
{
m_scriptNode->selection()->clear();
}
return true;
}
NodeGadget *nodeGadget = runTimeCast<NodeGadget>( gadgetsUnderMouse[0] );
if( !nodeGadget )
{
nodeGadget = gadgetsUnderMouse[0]->ancestor<NodeGadget>();
}
if( nodeGadget )
{
Gaffer::NodePtr node = nodeGadget->node();
bool shiftHeld = event.modifiers && ButtonEvent::Shift;
bool nodeSelected = m_scriptNode->selection()->contains( node );
std::vector<Gaffer::Node *> affectedNodes;
if( const BackdropNodeGadget *backdrop = runTimeCast<BackdropNodeGadget>( nodeGadget ) )
{
backdrop->framed( affectedNodes );
}
if( event.modifiers & ButtonEvent::Alt )
{
std::vector<NodeGadget *> upstream;
upstreamNodeGadgets( node, upstream );
for( std::vector<NodeGadget *>::const_iterator it = upstream.begin(), eIt = upstream.end(); it != eIt; ++it )
{
affectedNodes.push_back( (*it)->node() );
}
}
affectedNodes.push_back( node );
if( nodeSelected )
{
if( shiftHeld )
{
m_scriptNode->selection()->remove( affectedNodes.begin(), affectedNodes.end() );
}
}
else
{
if( !shiftHeld )
{
m_scriptNode->selection()->clear();
}
m_scriptNode->selection()->add( affectedNodes.begin(), affectedNodes.end() );
}
return true;
}
}
else if( event.buttons == ButtonEvent::Middle )
{
// potentially the start of a middle button drag on a node
return nodeGadgetAt( event.line );
}
return false;
}