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package com.c2kernel.graph.controller;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import com.c2kernel.graph.model.GraphModelManager;
import com.c2kernel.graph.model.GraphPoint;
import com.c2kernel.graph.model.Vertex;
import com.c2kernel.graph.view.EditorModeListener;
import com.c2kernel.graph.view.EditorToolBar;
public class EdgeConstructionController extends MouseAdapter implements MouseMotionListener, EditorModeListener
{
private GraphModelManager mGraphModelManager = null;
private EditorToolBar mEditorToolBar = null;
/**********/
/* States */
/**********/
private final Integer kOtherMode = new Integer(0);
private final Integer kWaitOrigin = new Integer(1);
private final Integer kWaitTerminus = new Integer(2);
/**********/
/* Events */
/**********/
private final int kEdgeEntered = 0;
private final int kOtherEntered = 1;
private final int kPressOnVertex = 2;
private final int kDrag = 3;
private final int kReleaseOnTerminus = 4;
private final int kReleaseOnNothing = 5;
/***********/
/* Actions */
/***********/
private interface Action
{
public void doIt(Object data);
}
private Action mSetOriginVertex = new Action()
{
public void doIt(Object data)
{
if(mGraphModelManager != null)
{
mGraphModelManager.getModel().setNewEdgeOriginVertex((Vertex)data);
}
}
};
private Action mSetEndPoint = new Action()
{
public void doIt(Object data)
{
if(mGraphModelManager != null)
{
mGraphModelManager.getModel().setNewEdgeEndPoint((Point)data);
}
}
};
private Action mClearEdge = new Action()
{
public void doIt(Object data)
{
if(mGraphModelManager != null)
{
mGraphModelManager.getModel().setNewEdgeOriginVertex(null);
mGraphModelManager.getModel().setNewEdgeEndPoint(null);
}
}
};
private Action mCreateEdge = new Action()
{
public void doIt(Object data)
{
if((mGraphModelManager != null) && (mEditorToolBar != null) && mGraphModelManager.isEditable())
{
mGraphModelManager.getModel().createDirectedEdge
(
mGraphModelManager.getModel().getNewEdgeOriginVertex(),
(Vertex)data,
mEditorToolBar.getSelectedEdgeType()
);
mGraphModelManager.getModel().setNewEdgeOriginVertex(null);
mGraphModelManager.getModel().setNewEdgeEndPoint(null);
}
}
};
/***********************************/
/* Finite State Transition Network */
/***********************************/
private Object[][][] mFSTN =
{// OtherMode WaitOrigin WaitTerminus
/* EdgeEntered */ {{null, kWaitOrigin}, null , null },
/* OtherEntered */ { null , {null , kOtherMode} , null },
/* PressOnVertex */ { null , {mSetOriginVertex, kWaitTerminus}, null },
/* Drag */ { null , null , {mSetEndPoint, null} },
/* ReleaseOnTerminus */ { null , null , {mCreateEdge , kWaitOrigin}},
/* ReleaseOnNothing */ { null , null , {mClearEdge , kWaitOrigin}}
};
/*****************/
/* Current state */
/*****************/
private Integer mState = kOtherMode;
/**************************/
/* Event processing logic */
/**************************/
private void processEvent(int event, Object data)
{
Object[] transition = mFSTN[event][mState.intValue()];
Action action = null;
Integer nextState = null;
if(transition != null)
{
action = (Action)transition[0];
nextState = (Integer)transition[1];
if(action != null)
{
action.doIt(data);
}
if(nextState != null)
{
mState = nextState;
}
}
}
/********************/
/* Public interface */
/********************/
public void setGraphModelManager(GraphModelManager graphModelManager)
{
mGraphModelManager = graphModelManager;
}
public void setEditorToolBar(EditorToolBar editorToolBar)
{
mEditorToolBar = editorToolBar;
mEditorToolBar.addEditorModeListener(this);
}
public void editorModeChanged(String idOfNewMode)
{
if(idOfNewMode.equals("Edge"))
{
processEvent(kEdgeEntered, null);
}
else
{
processEvent(kOtherEntered, null);
}
}
public void mousePressed(MouseEvent me)
{
Vertex vertex = null;
Point mousePoint = null;
if(mGraphModelManager != null)
{
// Determine if there is a vertex under the mouse cursor
mousePoint = me.getPoint();
vertex = mGraphModelManager.getModel().getVertex(new GraphPoint(mousePoint.x, mousePoint.y));
// If the mouse has been pressed on a vertex
if(vertex != null)
{
processEvent(kPressOnVertex, vertex);
}
}
}
public void mouseReleased(MouseEvent me)
{
Vertex vertex = null;
Point mousePoint = null;
if(mGraphModelManager != null)
{
// Determine if there is a vertex under the mouse cursor
mousePoint = me.getPoint();
vertex = mGraphModelManager.getModel().getVertex(new GraphPoint(mousePoint.x, mousePoint.y));
// If the mouse has been released on a vertex which is not the origin vertex
if((vertex != null) && (vertex != mGraphModelManager.getModel().getNewEdgeOriginVertex()))
{
processEvent(kReleaseOnTerminus, vertex);
}
else
{
processEvent(kReleaseOnNothing, null);
}
}
}
public void mouseExited(MouseEvent me)
{
}
public void mouseDragged(MouseEvent me)
{
processEvent(kDrag, me.getPoint());
}
public void mouseMoved(MouseEvent me)
{
}
}
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