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Views: 276 | Replies: 3 | Solved
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JComboBox problems

  #1  
Jul 24th, 2008
Hi all. I have this assignment to show a panel to allow users to dynamically alter FlowLayout manager parameters. It doesnt look that pretty, but functionally it is working for the most part. I have most of it up and running, but I simply cannot get the JComboBox working. I have to use this to set the alignment parameter: left, right, or center. How do I go about detecting the selection and then having that alter my settings? Thanks in advance for any help/advice/tips. My code thus far is:

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java Syntax (Toggle Plain Text) 
  1. // Exercise28_1: Demonstrate FlowLayout properties
  2. import java.awt.*;
  3. import java.awt.event.*;
  4. import java.applet.*;
  5. import javax.swing.*;
  6. import javax.swing.border.*;
  7.  
  8. public class Exercise28_1 extends JApplet {
  9.   boolean isStandalone = false;
  10.   JPanel jpComponents = new JPanel();
  11.   JPanel jPanel2 = new JPanel();
  12.   JPanel jpAlignment = new JPanel();
  13.   FlowLayout flowLayout1 = new FlowLayout();
  14.   JLabel jLabel1 = new JLabel();
  15.   JPanel jPanel3 = new JPanel();
  16.   FlowLayout flowLayout2 = new FlowLayout();
  17.   JPanel jPanel4 = new JPanel();
  18.   BorderLayout borderLayout1 = new BorderLayout();
  19.   JComboBox jtfAlignment = new JComboBox(new Object[]
  20.   {"Left", "Center", "Right"});
  21.   FlowLayout flowLayout3 = new FlowLayout();
  22.   JLabel jLabel3 = new JLabel();
  23.   JLabel jLabel4 = new JLabel();
  24.   JPanel jpGaps = new JPanel();
  25.   BorderLayout borderLayout2 = new BorderLayout();
  26.   JTextField jtfHGap = new JTextField();
  27.   JTextField jtfVGap = new JTextField();
  28.   FlowLayout flowLayout4 = new FlowLayout();
  29.   FlowLayout flowLayout5 = new FlowLayout();
  30.   JPanel jPanel5 = new JPanel();
  31.   JPanel jPanel6 = new JPanel();
  32.   FlowLayout flowLayout = new FlowLayout();
  33.   TitledBorder titledBorder1;
  34.   TitledBorder titledBorder2;
  35.  
  36.   //Construct the applet
  37.   public Exercise28_1() {
  38.     titledBorder1 = new TitledBorder("");
  39.     titledBorder2 = new TitledBorder("");
  40.     this.setSize(new Dimension(400,300));
  41.     jPanel2.setLayout(flowLayout1);
  42.     jLabel1.setText("Alignment");
  43.     jPanel3.setLayout(flowLayout2);
  44.     jpAlignment.setLayout(borderLayout1);
  45.     jPanel4.setLayout(flowLayout3);
  46.     jLabel3.setText("HGap");
  47.     jLabel4.setText("VGap");
  48.     jpGaps.setLayout(borderLayout2);
  49.     jPanel5.setLayout(flowLayout4);
  50.     jPanel6.setLayout(flowLayout5);
  51.     jpComponents.setLayout(flowLayout);
  52.  
  53.     jtfHGap.addActionListener(new java.awt.event.ActionListener() {
  54.       public void actionPerformed(ActionEvent e) {
  55.         jtfHGap_actionPerformed(e);
  56.       }
  57.     });
  58.     jtfVGap.addActionListener(new java.awt.event.ActionListener() {
  59.       public void actionPerformed(ActionEvent e) {
  60.         jtfVGap_actionPerformed(e);
  61.       }
  62.     });
  63.     jpComponents.setBorder(titledBorder1);
  64.     jPanel2.setBorder(titledBorder2);
  65.     titledBorder1.setTitle("Container of FlowLayout");
  66.     titledBorder2.setTitle("FlowLayout Properties");
  67.     this.getContentPane().add(jpComponents, BorderLayout.CENTER);
  68.     this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
  69.     jPanel2.add(jpAlignment, null);
  70.     jpAlignment.add(jPanel3, BorderLayout.WEST);
  71.     jPanel3.add(jLabel1, null);
  72.     jpAlignment.add(jPanel4, BorderLayout.CENTER);
  73.     jPanel4.add(jtfAlignment, null);
  74.     jPanel2.add(jpGaps, null);
  75.     jpGaps.add(jPanel5, BorderLayout.WEST);
  76.     jPanel5.add(jLabel3, null);
  77.     jPanel5.add(jLabel4, null);
  78.     jpGaps.add(jPanel6, BorderLayout.CENTER);
  79.     jPanel6.add(jtfHGap, null);
  80.     jPanel6.add(jtfVGap, null);
  81.  
  82.     // Add 15 buttons to jpComponents
  83.     for (int i = 0; i < 15; i++)
  84.       jpComponents.add(new JButton("Component " + i));
  85.   }
  86.  
  87.   void jtfHGap_actionPerformed(ActionEvent e) {
  88.     int hgap = new Integer(jtfHGap.getText()).intValue();
  89.     flowLayout.setHgap(hgap);
  90.     jpComponents.revalidate();
  91.   }
  92.  
  93.   void jtfVGap_actionPerformed(ActionEvent e) {
  94.     int vgap = new Integer(jtfVGap.getText()).intValue();
  95.     flowLayout.setVgap(vgap);
  96.     jpComponents.revalidate();
  97.   }
  98.  
  99.   public static void main(String[] args) {
  100.     Exercise28_1 applet = new Exercise28_1();
  101.     applet.isStandalone = true;
  102.     JFrame frame = new JFrame();
  103.     //EXIT_ON_CLOSE == 3
  104.     frame.setDefaultCloseOperation(3);
  105.     frame.setTitle("Exercise28_1");
  106.     frame.getContentPane().add(applet, BorderLayout.CENTER);
  107.     applet.init();
  108.     applet.start();
  109.     frame.setSize(400,320);
  110.     Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
  111.     frame.setLocation((d.width - frame.getSize().width) / 2,
  112.       (d.height - frame.getSize().height) / 2);
  113.     frame.setVisible(true);
  114.   }
  115. }
Last edited by jimbobjoe : Jul 24th, 2008 at 9:57 pm. Reason: syntax highlighting
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Re: JComboBox problems

  #2  
Jul 24th, 2008
I have been working on this some. I have gotten my window to look a little more presentable, although my text fields still are amazingly small, and I still haven't figured out how to make the JComboBox work. I have added an action listener, but I don't know how to apply a selection in the box to alter the FlowLayout manager. Here is my updated code:

Help with Code Tags
java Syntax (Toggle Plain Text) 
  1. // Exercise28_1: Demonstrate FlowLayout properties
  2. import java.awt.*;
  3. import java.awt.event.*;
  4. import java.applet.*;
  5. import javax.swing.*;
  6. import javax.swing.border.*;
  7.  
  8. public class Exercise28_1 extends JApplet {
  9.   boolean isStandalone = false;
  10.   JPanel jpComponents = new JPanel();
  11.   JPanel jPanel2 = new JPanel();
  12.   JPanel jpAlignment = new JPanel();
  13.   FlowLayout flowLayout1 = new FlowLayout();
  14.   JLabel jLabel1 = new JLabel();
  15.   JPanel jPanel3 = new JPanel();
  16.   FlowLayout flowLayout2 = new FlowLayout();
  17.   JPanel jPanel4 = new JPanel();
  18.   BorderLayout borderLayout1 = new BorderLayout();
  19.   JComboBox jcbAlignment = new JComboBox(new Object[]
  20.   {"Left", "Center", "Right"});
  21.   FlowLayout flowLayout3 = new FlowLayout();
  22.   JLabel jLabel3 = new JLabel();
  23.   JLabel jLabel4 = new JLabel();
  24.   JPanel jpGaps = new JPanel();
  25.   BorderLayout borderLayout2 = new BorderLayout();
  26.   JTextField jtfHGap = new JTextField();
  27.   JTextField jtfVGap = new JTextField();
  28.   FlowLayout flowLayout4 = new FlowLayout();
  29.   FlowLayout flowLayout5 = new FlowLayout();
  30.   JPanel jPanel5 = new JPanel();
  31.   JPanel jPanel6 = new JPanel();
  32.   FlowLayout flowLayout = new FlowLayout();
  33.   TitledBorder titledBorder1;
  34.   TitledBorder titledBorder2;
  35.  
  36.   //Construct the applet
  37.   public Exercise28_1() {
  38.     titledBorder1 = new TitledBorder("");
  39.     titledBorder2 = new TitledBorder("");
  40.     this.setSize(new Dimension(400,300));
  41.     jPanel2.setLayout(flowLayout1);
  42.     jLabel1.setText("Alignment");
  43.     jPanel3.setLayout(flowLayout2);
  44.     jpAlignment.setLayout(borderLayout1);
  45.     jPanel4.setLayout(flowLayout3);
  46.     jLabel3.setText("HGap");
  47.     jLabel4.setText("VGap");
  48.     jpGaps.setLayout(borderLayout2);
  49.     jPanel5.setLayout(flowLayout4);
  50.     jPanel6.setLayout(flowLayout5);
  51.     jpComponents.setLayout(flowLayout);
  52.  
  53.     jcbAlignment.addActionListener(new java.awt.event.ActionListener(){
  54.       public void actionPerformed(ActionEvent e) {
  55.       	jcbAlignment_actionPerformed(e);
  56.       }
  57.     });
  58.  
  59.     jtfHGap.addActionListener(new java.awt.event.ActionListener() {
  60.       public void actionPerformed(ActionEvent e) {
  61.         jtfHGap_actionPerformed(e);
  62.       }
  63.     });
  64.     jtfVGap.addActionListener(new java.awt.event.ActionListener() {
  65.       public void actionPerformed(ActionEvent e) {
  66.         jtfVGap_actionPerformed(e);
  67.       }
  68.     });
  69.     jpComponents.setBorder(titledBorder1);
  70.     jPanel2.setBorder(titledBorder2);
  71.     titledBorder1.setTitle("Container of FlowLayout");
  72.     titledBorder2.setTitle("FlowLayout Properties");
  73.     this.getContentPane().add(jpComponents, BorderLayout.CENTER);
  74.     this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
  75.     jPanel2.add(jpAlignment, null);
  76.     jpAlignment.add(jPanel3, BorderLayout.WEST);
  77.     jPanel3.add(jLabel1, null);
  78.     jpAlignment.add(jPanel4, BorderLayout.CENTER);
  79.     jPanel4.add(jcbAlignment, null);
  80.     jPanel2.add(jpGaps, null);
  81.     jpGaps.add(jPanel5, BorderLayout.EAST);
  82.     jPanel5.add(jLabel3, null);
  83.     jPanel5.add(jtfHGap, null);
  84.     jpGaps.add(jPanel6, BorderLayout.SOUTH);
  85.     jPanel6.add(jLabel4, null);
  86.     jPanel6.add(jtfVGap, null);
  87.  
  88.     // Add 15 buttons to jpComponents
  89.     for (int i = 0; i < 15; i++)
  90.       jpComponents.add(new JButton("Component " + i));
  91.   }
  92.  
  93.   void jcbAlignment_actionPerformed(ActionEvent e) {
  94.  
  95.   }
  96.   void jtfHGap_actionPerformed(ActionEvent e) {
  97.     int hgap = new Integer(jtfHGap.getText()).intValue();
  98.     flowLayout.setHgap(hgap);
  99.     jpComponents.revalidate();
  100.   }
  101.  
  102.   void jtfVGap_actionPerformed(ActionEvent e) {
  103.     int vgap = new Integer(jtfVGap.getText()).intValue();
  104.     flowLayout.setVgap(vgap);
  105.     jpComponents.revalidate();
  106.   }
  107.  
  108.   public static void main(String[] args) {
  109.     Exercise28_1 applet = new Exercise28_1();
  110.     applet.isStandalone = true;
  111.     JFrame frame = new JFrame();
  112.     //EXIT_ON_CLOSE == 3
  113.     frame.setDefaultCloseOperation(3);
  114.     frame.setTitle("Exercise28_1");
  115.     frame.getContentPane().add(applet, BorderLayout.CENTER);
  116.     applet.init();
  117.     applet.start();
  118.     frame.setSize(400,320);
  119.     Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
  120.     frame.setLocation((d.width - frame.getSize().width) / 2,
  121.       (d.height - frame.getSize().height) / 2);
  122.     frame.setVisible(true);
  123.   }
  124. }
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  #3  
Jul 24th, 2008
I figured out how to make the combobox work. Now my only problem is making the text fields bigger. any advice for this?

Here is my almost final code:

Help with Code Tags
java Syntax (Toggle Plain Text) 
  1. // Exercise28_1: Demonstrate FlowLayout properties
  2. import java.awt.*;
  3. import java.awt.event.*;
  4. import java.applet.*;
  5. import javax.swing.*;
  6. import javax.swing.border.*;
  7.  
  8. public class Exercise28_1 extends JApplet {
  9.   boolean isStandalone = false;
  10.   JPanel jpComponents = new JPanel();
  11.   JPanel jPanel2 = new JPanel();
  12.   JPanel jpAlignment = new JPanel();
  13.   FlowLayout flowLayout1 = new FlowLayout();
  14.   JLabel jLabel1 = new JLabel();
  15.   JPanel jPanel3 = new JPanel();
  16.   FlowLayout flowLayout2 = new FlowLayout();
  17.   JPanel jPanel4 = new JPanel();
  18.   BorderLayout borderLayout1 = new BorderLayout();
  19.   JComboBox jcbAlignment = new JComboBox(new Object[]
  20.   {"Left", "Center", "Right"});
  21.   FlowLayout flowLayout3 = new FlowLayout();
  22.   JLabel jLabel3 = new JLabel();
  23.   JLabel jLabel4 = new JLabel();
  24.   JPanel jpGaps = new JPanel();
  25.   BorderLayout borderLayout2 = new BorderLayout();
  26.   JTextField jtfHGap = new JTextField();
  27.   JTextField jtfVGap = new JTextField();
  28.   FlowLayout flowLayout4 = new FlowLayout();
  29.   FlowLayout flowLayout5 = new FlowLayout();
  30.   JPanel jPanel5 = new JPanel();
  31.   JPanel jPanel6 = new JPanel();
  32.   FlowLayout flowLayout = new FlowLayout();
  33.   TitledBorder titledBorder1;
  34.   TitledBorder titledBorder2;
  35.  
  36.   //Construct the applet
  37.   public Exercise28_1() {
  38.     titledBorder1 = new TitledBorder("");
  39.     titledBorder2 = new TitledBorder("");
  40.     this.setSize(new Dimension(400,300));
  41.     jPanel2.setLayout(flowLayout1);
  42.     jLabel1.setText("Alignment");
  43.     jPanel3.setLayout(flowLayout2);
  44.     jpAlignment.setLayout(borderLayout1);
  45.     jPanel4.setLayout(flowLayout3);
  46.     jLabel3.setText("HGap");
  47.     jLabel4.setText("VGap");
  48.     jpGaps.setLayout(borderLayout2);
  49.     jPanel5.setLayout(flowLayout4);
  50.     jPanel6.setLayout(flowLayout5);
  51.     jpComponents.setLayout(flowLayout);
  52.  
  53.     jcbAlignment.addActionListener(new java.awt.event.ActionListener(){
  54.       public void actionPerformed(ActionEvent e) {
  55.       	jcbAlignment_actionPerformed(e);
  56.       }
  57.     });
  58.  
  59.     jtfHGap.addActionListener(new java.awt.event.ActionListener() {
  60.       public void actionPerformed(ActionEvent e) {
  61.         jtfHGap_actionPerformed(e);
  62.       }
  63.     });
  64.     jtfVGap.addActionListener(new java.awt.event.ActionListener() {
  65.       public void actionPerformed(ActionEvent e) {
  66.         jtfVGap_actionPerformed(e);
  67.       }
  68.     });
  69.     jpComponents.setBorder(titledBorder1);
  70.     jPanel2.setBorder(titledBorder2);
  71.     titledBorder1.setTitle("Container of FlowLayout");
  72.     titledBorder2.setTitle("FlowLayout Properties");
  73.     this.getContentPane().add(jpComponents, BorderLayout.CENTER);
  74.     this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
  75.     jPanel2.add(jpAlignment, null);
  76.     jpAlignment.add(jPanel3, BorderLayout.WEST);
  77.     jPanel3.add(jLabel1, null);
  78.     jpAlignment.add(jPanel4, BorderLayout.CENTER);
  79.     jPanel4.add(jcbAlignment, null);
  80.     jPanel2.add(jpGaps, null);
  81.     jpGaps.add(jPanel5, BorderLayout.EAST);
  82.     jPanel5.add(jLabel3, null);
  83.     jPanel5.add(jtfHGap, null);
  84.     jpGaps.add(jPanel6, BorderLayout.SOUTH);
  85.     jPanel6.add(jLabel4, null);
  86.     jPanel6.add(jtfVGap, null);
  87.  
  88.     // Add 15 buttons to jpComponents
  89.     for (int i = 0; i < 15; i++)
  90.       jpComponents.add(new JButton("Component " + i));
  91.   }
  92.  
  93.   void jcbAlignment_actionPerformed(ActionEvent e) {
  94.   	int alignment = new Integer(jcbAlignment.getSelectedIndex()).intValue();
  95.   	flowLayout.setAlignment(alignment);
  96.   	jpComponents.revalidate();
  97.   }
  98.   void jtfHGap_actionPerformed(ActionEvent e) {
  99.     int hgap = new Integer(jtfHGap.getText()).intValue();
  100.     flowLayout.setHgap(hgap);
  101.     jpComponents.revalidate();
  102.   }
  103.  
  104.   void jtfVGap_actionPerformed(ActionEvent e) {
  105.     int vgap = new Integer(jtfVGap.getText()).intValue();
  106.     flowLayout.setVgap(vgap);
  107.     jpComponents.revalidate();
  108.   }
  109.  
  110.   public static void main(String[] args) {
  111.     Exercise28_1 applet = new Exercise28_1();
  112.     applet.isStandalone = true;
  113.     JFrame frame = new JFrame();
  114.     //EXIT_ON_CLOSE == 3
  115.     frame.setDefaultCloseOperation(3);
  116.     frame.setTitle("Exercise28_1");
  117.     frame.getContentPane().add(applet, BorderLayout.CENTER);
  118.     applet.init();
  119.     applet.start();
  120.     frame.setSize(400,320);
  121.     Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
  122.     frame.setLocation((d.width - frame.getSize().width) / 2,
  123.       (d.height - frame.getSize().height) / 2);
  124.     frame.setVisible(true);
  125.   }
  126. }
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Re: JComboBox problems

  #4  
Jul 25th, 2008
JTextField jtfVGap = new JTextField(40)
I AM the 12th CYLON
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