Dynamisches Erzeugen eines Button

[Lemieux]

Hallo!
Ich will, dass wenn ich einen ComponentButton (Klasse: ComponentButton extends JComponent; befindet sich auf PanelMain) auf meiner GUI anklicke, auf einem anderen Panel (Klasse: PanelCommand extends JPanel) f�r jedes Command ein oder mehrere CommandButton(s) (Klasse: CommandButton extends JComponent) erstellt und angezeigt werden.

Habe bereits ne Weile herumprobiert, finde aber keine L�sung wie ich das machen k�nnte

Klasse ComponentButton

public void mouseClicked(MouseEvent arg0)
    {
        System.out.println("Klick");
        _oJComponent.setBorder(new EtchedBorder(Color.blue, Color.blue));
        if(LCMC.isLoggedIn() == true)
        {            
            Vector vObjCmds = _oMMCObj.getCmd();
            
            System.out.println("\nM�gliche Befehle f�r dieses Objekt: ");
            for(int i=0; i < vObjCmds.size(); i++)
            {
                vObjCmds.get(i);
                System.out.print(vObjCmds.get(i) + " ");
                PanelCommand.setObjCmd((CmdDesc)vObjCmds.get(i));
                PanelCommand.getpCmd().createCmdButton();
            }
            System.out.println("\n");
        }
        else
        {
            String sFehler = "FEHLER! " +
                             "Sie sind nicht am MMC eingeloggt! " +
                             "Das bedeutet, dass sie keine Berechtigung haben, Objekte vom MMC einzulesen!";
            JLabel lFehler = new JLabel(sFehler);
            this.add(lFehler);
        }
    }

Klasse PanelCommand

package lcmc.gui;

import java.awt.*;
import java.util.Vector;

import javax.swing.*;

import com.v8tech.mmc.j2melib.CmdDesc;

public class PanelCommand extends JPanel
{
    private Image               iBackground;
    private static CmdDesc      _oObjCmd;
    private GUI                 _mainFrame;
    private static PanelCommand _pCmd;

    public PanelCommand(GUI mainFrame, JPanel pWest)
    {
        iBackground = mainFrame.loadImage("command");
        
        setMainFrame(mainFrame);
        
        FlowLayout loCommandLayout = new FlowLayout();
        loCommandLayout.setVgap(15);
        loCommandLayout.setHgap(40);
        this.setLayout(loCommandLayout);        
        
        JLabel lNullLabel = new JLabel();
        this.add(lNullLabel);
        lNullLabel.setPreferredSize(new java.awt.Dimension(220, 20));

        this.setPreferredSize(new java.awt.Dimension(268, 464));
        
        pWest.add(this);
    }
    
    public void createCmdButton()
    {
        System.out.println("Test");
        this.add(new CommandButton(_mainFrame, _oObjCmd.toString()));
    }

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        if (iBackground != null)
        {
            g.drawImage(iBackground, 0, 0, null);
        }
    }
    
    public static void setObjCmd(CmdDesc oObjCmd)
    {
        _oObjCmd = oObjCmd;
    }

    public void setMainFrame(GUI mainFrame)
    {
        this._mainFrame = mainFrame;
    }
    
    public static PanelCommand getpCmd()
    {
        return _pCmd;
    }
}

In der Konsole bekomme ich immer folgenden Text und Exception

Klick

Mögliche Befehle für dieses Objekt:

OFF {} Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at lcmc.gui.ComponentButton.mouseClicked(ComponentButton.java:124)
at java.awt.Component.processMouseEvent(Component.java:5491)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1766)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Wäre über jede Hilfe dankbar!


mfg,
Lemieux

 

[Lemieux]

Hat sich erledigt, habe den MouseClicked-Teil großteils in den Konstruktor der PanelCommand Klasse geschrieben, jetzt gehts!

 

[André Uhres]

..habe den MouseClicked-Teil großteils in den Konstruktor der PanelCommand Klasse geschrieben..

:? ???:L

package basics;
/*
 * GUI.java
 */
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
public class GUI extends JFrame{
    private ComponentButton bt;
    private PanelCommand pn;
    private JPanel pWest;
    public GUI() {
        super("GUI");
        setSize(400,300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        bt = new ComponentButton(this, "Test");
        pWest = new JPanel();
        pn = new PanelCommand(this, pWest);
        add(bt, BorderLayout.NORTH);
        add(pWest, BorderLayout.WEST);
    }
    public PanelCommand getPn() {return pn;}
    public Image loadImage(final String string) {return null;}
    public static void main(final String[] args) {new GUI().setVisible(true);}
}
class ComponentButton extends JComponent implements MouseListener{
    private JLabel _oJComponent = new JLabel("TEST");
    private LCMC _oMMCObj = new LCMC();
    private GUI mainFrame;
    public ComponentButton(final GUI mainFrame, final String sName) {
        this.mainFrame = mainFrame;
        setName(sName);
        setLayout(new FlowLayout());
        add(_oJComponent);
        addMouseListener(this);
    }
    public void mouseClicked(final MouseEvent arg0) {
        System.out.println("Klick");
        _oJComponent.setBorder(new EtchedBorder(Color.blue, Color.blue));
        if(LCMC.isLoggedIn() == true) {
            Vector vObjCmds = _oMMCObj.getCmd();
            System.out.println("\nMögliche Befehle für dieses Objekt: ");
            for(int i=0; i < vObjCmds.size(); i++) {
                vObjCmds.get(i);
                System.out.print(vObjCmds.get(i) + " ");
                mainFrame.getPn().setObjCmd((CmdDesc)vObjCmds.get(i));
                mainFrame.getPn().createCmdButton();
            }
            System.out.println("\n");
        }else{
            String sFehler = "FEHLER! " +
                    "Sie sind nicht am MMC eingeloggt! " +
                    "Das bedeutet, dass sie keine Berechtigung haben, Objekte vom MMC einzulesen!";
            JLabel lFehler = new JLabel(sFehler);
            this.add(lFehler);
        }
    }
    public void mousePressed(final MouseEvent e) {}
    public void mouseReleased(final MouseEvent e) {}
    public void mouseEntered(final MouseEvent e) {}
    public void mouseExited(final MouseEvent e) {}
}
class PanelCommand extends JPanel {
    private Image iBackground;
    private CmdDesc _oObjCmd;
    private GUI _mainFrame;
    public PanelCommand(final GUI mainFrame, final JPanel pWest) {
        iBackground = mainFrame.loadImage("command");
        setMainFrame(mainFrame);
        FlowLayout loCommandLayout = new FlowLayout();
        loCommandLayout.setVgap(15);
        loCommandLayout.setHgap(40);
        this.setLayout(loCommandLayout);
        JLabel lNullLabel = new JLabel();
        this.add(lNullLabel);
        lNullLabel.setPreferredSize(new Dimension(220, 20));
        this.setPreferredSize(new Dimension(268, 464));
        pWest.add(this);
    }
    public void createCmdButton() {
        System.out.println("Test");
        this.add(new CommandButton(_mainFrame, _oObjCmd.toString()));
    }
    public void setObjCmd(final CmdDesc oObjCmd) {_oObjCmd = oObjCmd;}
    public void setMainFrame(final GUI mainFrame) {this._mainFrame = mainFrame;}
}
class LCMC {
    private Vector<CmdDesc> v = new Vector<CmdDesc>();
    public LCMC(){
        v.add(new CmdDesc("print"));
        v.add(new CmdDesc("show"));
    }
    public static boolean isLoggedIn() {return true;}
    public Vector getCmd() {return v;}
}
class CmdDesc{
    private String cmd;
    public CmdDesc(final String cmd){this.cmd = cmd;}
    public String toString() {return cmd;}
}
class CommandButton extends JComponent{
    public CommandButton(final GUI gui, final String str){}
}