toolpaneltogglemenuitem.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/gui/menu/ToolPanelToggleMenuItem.java,v $
// $RCSfile: ToolPanelToggleMenuItem.java,v $
// $Revision: 1.3.2.1 $
// $Date: 2004/10/14 18:26:56 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.gui.menu;

import com.bbn.openmap.LightMapHandlerChild;
import com.bbn.openmap.gui.ToolPanel;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import javax.swing.JMenuItem;

/**
 * Menu item that holds onto the tool panel, and hides/displays it
 * when selected. Since the ToolPanel will make itself invisible if
 * all of its components are invisible, this menu item will disable
 * itself when the ToolPanel has set itself to be invisible, and
 * vice-versa.
 */
public class ToolPanelToggleMenuItem extends JMenuItem implements
        ActionListener, LightMapHandlerChild, ComponentListener {

    protected ToolPanel toolPanel = null;
    protected final static String hideLabel = "Hide Tool Panel";
    protected final static String displayLabel = "Display Tool Panel";

    public ToolPanelToggleMenuItem() {
        // assume that the tool panel isn't there.
        // Won't be visible if it isn't.
        super(hideLabel);
        init(null);
    }

    public ToolPanelToggleMenuItem(ToolPanel tp) {
        super(tp.isVisible() ? hideLabel : displayLabel);
        init(tp);
    }

    public void init(ToolPanel tp) {
        setToolPanel(tp);
        addActionListener(this);
    }

    public void setToolPanel(ToolPanel tp) {
        if (toolPanel != null) {
            toolPanel.removeComponentListener(this);
        }

        toolPanel = tp;
        this.setVisible(toolPanel != null);

        if (toolPanel != null) {
            toolPanel.addComponentListener(this);
            stateCheck();
        }
    }

    public ToolPanel getToolPanel() {
        return toolPanel;
    }

    public boolean forToolPanel(ToolPanel tp) {
        return (tp == toolPanel);
    }

    public void actionPerformed(ActionEvent ae) {
        if (toolPanel != null) {
            boolean selected = toolPanel.isVisible();
            toolPanel.setVisible(!selected);
            setText(selected ? displayLabel : hideLabel);
        }
    }

    public void findAndInit(Object someObj) {
        if (someObj instanceof ToolPanel) {
            setToolPanel((ToolPanel) someObj);
        }
    }

    public void findAndUndo(Object someObj) {
        if (someObj instanceof ToolPanel
                && getToolPanel() == (ToolPanel) someObj) {
            setToolPanel(null);
        }
    }

    /**
     * Check the state of the ToolPanel and set enabled state and text
     * accordingly.
     */
    public void stateCheck() {
        if (toolPanel != null) {
            setEnabled(toolPanel.areComponentsVisible());
            setText(toolPanel.isVisible() ? hideLabel : displayLabel);
        }
    }

    public void componentHidden(ComponentEvent ce) {
        stateCheck();
    }

    public void componentMoved(ComponentEvent ce) {}

    public void componentResized(ComponentEvent ce) {}

    public void componentShown(ComponentEvent ce) {
        stateCheck();
    }
}