eomgevent.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source:
// /cvs/distapps/openmap/src/openmap/com/bbn/openmap/omGraphics/event/EOMGEvent.java,v
// $
// $RCSfile: EOMGEvent.java,v $
// $Revision: 1.3.2.1 $
// $Date: 2004/10/14 18:27:30 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.omGraphics.event;

import com.bbn.openmap.omGraphics.EditableOMGraphic;

import java.awt.Cursor;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;

public class EOMGEvent {
    /** Nothing about the graphic is known or defined. */
    public final static int EOMG_UNDEFINED = 0;
    /**
     * The Graphic is defined and in a stable state without the grab
     * points active.
     */
    public final static int EOMG_DEFINED = 1;
    /**
     * The Graphic is defined, in a stable state with the grab points
     * active.
     */
    public final static int EOMG_SELECTED = 2;
    /**
     * The Graphic is defined, in a state of flux. The GrabPoints are
     * being manipulated, and the graphic parameters are being
     * modified as a result of this.
     */
    public final static int EOMG_EDIT = 3;
    /**
     * This is a state where something different or extra is being
     * done. Grab point being added/defined, some other parameter of
     * the graphic being modified where an extra state warrants it.
     * There may be other auxillary states defined, and they should be
     * defined to be greater than EOMG_AUX.
     */
    public final static int EOMG_AUX = 4;

    /** The EOMG in question. */
    protected EditableOMGraphic source;
    /**
     * The Cursor that should be active after this event is received.
     * If null, then the cursor should be unchanged.
     */
    protected Cursor cursor;
    /**
     * An instructional/error message that should be presented to the
     * user. If null, nothing should be displayed. Send an empty
     * string to clear out what is currently being displayed.
     */
    protected String message;
    /**
     * A java MouseEvent that might have caused this EOMGEvent. Can be
     * used by the listener to determine what type of action to take,
     * to check if an option key was held down, etc. May be null!
     */
    protected MouseEvent mouseEvent = null;

    /**
     * Create an Event.
     */
    public EOMGEvent(EditableOMGraphic source, Cursor cursor, String message,
            MouseEvent me) {
        this.source = source;
        this.cursor = cursor;
        this.message = message;
        this.mouseEvent = me;
    }

    /**
     * Deactivation event.
     */
    public EOMGEvent() {
        this.source = null;
        this.cursor = null;
        this.message = null;
        this.mouseEvent = null;
    }

    public void setSource(EditableOMGraphic eomg) {
        source = eomg;
    }

    public EditableOMGraphic getSource() {
        return source;
    }

    public void setCursor(Cursor cur) {
        cursor = cur;
    }

    public Cursor getCursor() {
        return cursor;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getMessage() {
        return message;
    }

    public void setMouseEvent(MouseEvent me) {
        mouseEvent = me;
    }

    /**
     * @return the MouseEvent that started the EOMG changing. May be
     *         null!
     */
    public MouseEvent getMouseEvent() {
        return mouseEvent;
    }

    public boolean shouldShowGUI() {
        if (mouseEvent != null) {
            return (mouseEvent.isControlDown() || (mouseEvent.getModifiers() & InputEvent.BUTTON3_MASK) > 0);
        }
        return false;
    }

    public boolean shouldDeactivate() {
        return this.source == null && this.cursor == null
                && this.message == null && this.mouseEvent == null;
    }

}