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Centering Issues

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Join Date: Sep 2005
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kahaj kahaj is offline Offline
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Centering Issues

 
0
  #1
Sep 15th, 2009
I'm toying around with Java trying to familiarize myself with the basic GUI stuff. I can't get my program or my text field inside of it to center on the screen.

For the Simple... file, I've tried using the
Java Syntax (Toggle Plain Text) 
  1. theTextArea.setLocation(15, 30);
and
Java Syntax (Toggle Plain Text) 
  1. //theTextArea.setAlignmentX(CENTER_ALIGNMENT);
  2.           //theTextArea.setAlignmentY(CENTER_ALIGNMENT);
seperately. When I have either of them as active code and not comments, it throws an error and won't even run the program. What am I missing here?

Java Syntax (Toggle Plain Text) 
  1. //mainForSimpleGUI.java
  2.  
  3. import javax.swing.*;
  4. import java.awt.*;
  5.  
  6. public class mainForSimpleGUI
  7. {
  8.     public static void main(String[] args)
  9.     {
  10.         SimpleJavaGUI labelFrame = new SimpleJavaGUI(); //creates SimpleJavaGUI
  11.         //labelFrame = new JLabel();
  12.         labelFrame.setLocationRelativeTo(null);
  13.         labelFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  14.         labelFrame.setSize(300, 300);
  15.         labelFrame.setVisible(true);
  16.     }
  17.  
  18. }


Java Syntax (Toggle Plain Text) 
  1. //SimpleJavaGUI.java
  2.  
  3. import java.awt.*;
  4. import javax.swing.*;
  5.  
  6.  
  7. public class SimpleJavaGUI extends JFrame
  8. {
  9.     private JTextArea theTextArea;
  10.  
  11.     public SimpleJavaGUI()
  12.     {
  13.         super("mainForSimpleGUI");
  14.         setLayout(new FlowLayout() );
  15.  
  16.         theTextArea.setLocation(15, 30);
  17.         //theTextArea.setAlignmentX(CENTER_ALIGNMENT);
  18.         //theTextArea.setAlignmentY(CENTER_ALIGNMENT);
  19.         theTextArea = new JTextArea(2, 20);
  20.         theTextArea.setText(" Follow the white rabbit.");
  21.         theTextArea.setToolTipText("This is a text area.");
  22.         theTextArea.setEditable(false);
  23.         theTextArea.setDisabledTextColor(Color.BLACK);
  24.         theTextArea.setLineWrap(true);
  25.         theTextArea.setBorder(BorderFactory.createLineBorder(Color.black) );
  26.         add(theTextArea);
  27.     }
  28. }
Be what you is, don't be what you ain't.
Cause if you ain't what you is, you is what you ain't!
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Re: Centering Issues

 
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  #2
Sep 15th, 2009
Use line 19 before 16 and 17. You are not initializing the theTextArea.
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Re: Centering Issues

 
0
  #3
Sep 15th, 2009
Okay, I changed that. For whatever reason, it's not showing the text area at all now. Here's how it looks now (I commented out any location-oriented lines just to try and "dumb" it down and figure out why my text area vanished):

Java Syntax (Toggle Plain Text) 
  1. //SimpleJavaGUI.java
  2.  
  3. import java.awt.*;
  4. import javax.swing.*;
  5.  
  6.  
  7. public class SimpleJavaGUI extends JFrame
  8. {
  9.     private JTextArea theTextArea;
  10.  
  11.     public SimpleJavaGUI()
  12.     {
  13.         super("mainForSimpleGUI");
  14.         setLayout(new FlowLayout() );
  15.  
  16.         theTextArea = new JTextArea(2, 15);
  17.         theTextArea.setLocation(50, 50);
  18.         //theTextArea.setAlignmentX(CENTER_ALIGNMENT);
  19.         //theTextArea.setAlignmentY(CENTER_ALIGNMENT);
  20.         theTextArea.setText(" Follow the white rabbit.");
  21.         theTextArea.setToolTipText("This is a text area.");
  22.         theTextArea.setEditable(false);
  23.         theTextArea.setDisabledTextColor(Color.BLACK);
  24.         theTextArea.setLineWrap(true);
  25.         theTextArea.setBorder(BorderFactory.createLineBorder(Color.black) );
  26.         add(theTextArea);
  27.     }
  28. }
Be what you is, don't be what you ain't.
Cause if you ain't what you is, you is what you ain't!
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Re: Centering Issues

 
0
  #4
Sep 16th, 2009
Java Syntax (Toggle Plain Text) 
  1.  
  2. import javax.swing.*;
  3.  
  4. import java.awt.*;
  5.  
  6.   public class mainForSimpleGUI
  7.   {
  8.       public static void main(String[] args)
  9.       {
  10.           SimpleJavaGUI labelFrame = new SimpleJavaGUI(); 
  11.           labelFrame = new SimpleJavaGUI();
  12.           labelFrame.setLocationRelativeTo(null);
  13.           labelFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  14.           labelFrame.setSize(300, 300);
  15.           labelFrame.setVisible(true);
  16.       }
  17.  
  18.   }
  19.  
  20.     @SuppressWarnings("serial")
  21. 	class SimpleJavaGUI extends JFrame
  22.   {
  23.       public  JTextArea theTextArea;
  24.  
  25.       public SimpleJavaGUI()
  26.       {
  27.           super("mainForSimpleGUI");
  28.           setLayout(new FlowLayout() );
  29.           theTextArea = new JTextArea(2, 20);
  30.           theTextArea.setLocation(15, 30);
  31.           theTextArea.setAlignmentX(CENTER_ALIGNMENT);
  32.           theTextArea.setAlignmentY(CENTER_ALIGNMENT);
  33.  
  34.           theTextArea.setText(" Follow the white rabbit.");
  35.           theTextArea.setToolTipText("This is a text area.");
  36.           theTextArea.setEditable(false);
  37.           theTextArea.setDisabledTextColor(Color.BLACK);
  38.           theTextArea.setLineWrap(true);
  39.           theTextArea.setBorder(BorderFactory.createLineBorder(Color.black) );
  40.           add(theTextArea);
  41.       }
  42.   }
I applied this and it is showing me the text area.
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Re: Centering Issues

 
0
  #5
Sep 16th, 2009
Okay, what options are available to center items within a JFrame? I thought for sure that the setAlignmentX/Y would work for it. I don't understand why they're not working.
Be what you is, don't be what you ain't.
Cause if you ain't what you is, you is what you ain't!
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