abstractmanipulator.java

JPowerGraph is a Java library for creating directed graphs for SWT. It supports graph movement, sele

package net.sourceforge.jpowergraph.manipulator;

import net.sourceforge.jpowergraph.pane.JGraphPane;

import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;

/**
 * A utility abstract class providing default implementation of listener methods.
 */
public class AbstractManipulator implements Manipulator {
    /** The graph pane. */
    protected JGraphPane m_graphPane;
    /** The screen point of the last mouse event. */
    protected Point m_lastMouseEventScreenPoint;

    public void setGraphPane(JGraphPane graphPane) {
        m_graphPane=graphPane;
    }
    
    public void notifyGraphPaneScrolled() {
    }
    protected void updateLastMouseEventScreenPoint(MouseEvent e) {
        m_lastMouseEventScreenPoint = m_graphPane.toDisplay(0, 0);
        m_lastMouseEventScreenPoint.x += e.x;
        m_lastMouseEventScreenPoint.y += e.y;
    }
    protected Point getLastMouseEventPoint() {
        Point point = m_graphPane.toDisplay(0, 0);
        point.x = m_lastMouseEventScreenPoint.x - point.x;
        point.y = m_lastMouseEventScreenPoint.y - point.y;
        return point;
    }
    protected void autoscroll(MouseEvent e) {
        if (!m_graphPane.getClientArea().contains(e.x,e.y)){
            m_graphPane.scrollRectToVisible(new Rectangle(e.x,e.y,300,300));
        }
    }

    public String getName() {
        return null;
    }
    
    public void paint(GC g) {}

    public void mouseDoubleClick(MouseEvent arg0) {}
    public void mouseDown(MouseEvent arg0) {}
    public void mouseUp(MouseEvent arg0) {}
    
    public void mouseEnter(MouseEvent arg0) {}
    public void mouseExit(MouseEvent arg0) {}
    public void mouseHover(MouseEvent arg0) {}
    public void mouseMove(MouseEvent arg0) {}
    
    public void keyPressed(KeyEvent arg0) {}
    public void keyReleased(KeyEvent arg0) {}
    
    public void focusGained(FocusEvent arg0) {}
    public void focusLost(FocusEvent arg0) {}
    
    public void dispose() {}

    public boolean isDisposed() {
        return false;
    }
}