www.pudn.com > src.rar > AssignReferencesPanel.java

/* 
* Copyright (c) 1996, 1997 Bill Venners. All Rights Reserved. 
* 
* This Java source file is part of the Interactive Illustrations Web 
* Site, which is delivered in the applets directory of the CD-ROM 
* that accompanies the book "Inside the Java Virtual Machine" by Bill 
* Venners, published by McGraw-Hill, 1997,ISBN: 0-07-913248-0. This 
* source file is provided for evaluation purposes only, but you can 
* redistribute it under certain conditions, described in the full 
* copyright notice below. 
* 
* Full Copyright Notice: 
* 
* All the web pages and Java applets delivered in the applets 
* directory of the CD-ROM, consisting of ".html," ".gif," ".class," 
* and ".java" files, are copyrighted (c) 1996, 1997 by Bill 
* Venners, and all rights are reserved.  This material may be copied 
* and placed on any commercial or non-commercial web server on any 
* network (including the internet) provided that the following 
* guidelines are followed: 
* 
* a. All the web pages and Java Applets (".html," ".gif," ".class," 
* and ".java" files), including the source code, that are delivered 
* in the applets directory of the CD-ROM that 
* accompanies the book must be published together on the same web 
* site. 
* 
* b. All the web pages and Java Applets (".html," ".gif," ".class," 
* and ".java" files) must be published "as is" and may not be altered 
* in any way. 
* 
* c. All use and access to this web site must be free, and no fees 
* can be charged to view these materials, unless express written 
* permission is obtained from Bill Venners. 
* 
* d. The web pages and Java Applets may not be distributed on any 
* media, other than a web server on a network, and may not accompany 
* any book or publication. 
* 
* BILL VENNERS MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE 
* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING 
* BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, 
* FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT.  BILL VENNERS 
* SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY A LICENSEE AS A 
* RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS 
* DERIVATIVES. 
*/ 
import java.awt.*; 
 
/** 
* This class serves as the outermost panel upon which all 
* the user interface goodies for the assign references 
* mode is placed. 
* 
* @author  Bill Venners 
*/ 
class AssignReferencesPanel extends Panel { 
 
    HeapOfFishTextArea controlPanelTextArea; 
    String currentAssignRefsMode = HeapOfFishStrings.linkFish; 
 
    AssignReferencesCanvases assignRefsCanvases; 
 
    AssignReferencesPanel(GCHeap gcHeap, LocalVariables localVars, HeapOfFishTextArea ta) { 
 
        controlPanelTextArea = ta; 
 
        setBackground(Color.blue); 
 
        setLayout(new BorderLayout()); 
 
        assignRefsCanvases = new AssignReferencesCanvases(gcHeap, localVars, ta); 
 
        add("South", new AssignReferencesCheckboxPanel()); 
        add("Center", assignRefsCanvases); 
    } 
 
    public void refreshInstructions() { 
        if (currentAssignRefsMode.equals(HeapOfFishStrings.moveFish)) { 
            controlPanelTextArea.setText(HeapOfFishStrings.moveFishInstructions); 
        } 
        else if (currentAssignRefsMode.equals(HeapOfFishStrings.linkFish)) { 
            controlPanelTextArea.setText(HeapOfFishStrings.linkFishInstructions); 
        } 
        else if (currentAssignRefsMode.equals(HeapOfFishStrings.unlinkFish)) { 
            controlPanelTextArea.setText(HeapOfFishStrings.unlinkFishInstructions); 
        } 
    } 
 
    public boolean action(Event evt, Object arg) { 
        if (evt.target instanceof Checkbox) { 
            Checkbox cb = (Checkbox) evt.target; 
            String cbname = cb.getLabel(); 
            if (cbname.equals(HeapOfFishStrings.moveFish)) { 
                if (!currentAssignRefsMode.equals(HeapOfFishStrings.moveFish)) { 
                    controlPanelTextArea.setText(HeapOfFishStrings.moveFish); 
                    assignRefsCanvases.setMode(HeapOfFishStrings.moveFish); 
                    controlPanelTextArea.setText(HeapOfFishStrings.moveFishInstructions); 
                } 
            } 
            else if (cbname.equals(HeapOfFishStrings.linkFish)) { 
                if (!currentAssignRefsMode.equals(HeapOfFishStrings.linkFish)) { 
                    controlPanelTextArea.setText(HeapOfFishStrings.linkFish); 
                    assignRefsCanvases.setMode(HeapOfFishStrings.linkFish); 
                    controlPanelTextArea.setText(HeapOfFishStrings.linkFishInstructions); 
                } 
            } 
            else if (cbname.equals(HeapOfFishStrings.unlinkFish)) { 
                if (!currentAssignRefsMode.equals(HeapOfFishStrings.unlinkFish)) { 
                    controlPanelTextArea.setText(HeapOfFishStrings.unlinkFish); 
                    assignRefsCanvases.setMode(HeapOfFishStrings.unlinkFish); 
                    controlPanelTextArea.setText(HeapOfFishStrings.unlinkFishInstructions); 
                } 
            } 
            currentAssignRefsMode = cbname; 
        } 
        return true; 
    } 
}