Question

making components appear/disappear with setVisible()

Asked by: bens2333

Hello I am having a setVisible() problem. I created a JCheckbox, set the initial state not to be checked, then when it is check a jtextfiled should appear. If the jcheckbox is unchecked the jtextfield goes area. It does not work. It works backward if the jtextfield is set to visible if set invisible it never appears. BUT if I check the jcheckbox and let the jtextfield be visible it works but that feels odd why a user would uncheck a box to not use it. I am think if you want to use a feature you here it? Here are my code bits, and I am using jbuilder which generates some code for you….

JCheckBox TableDetailsCheckBox = new JCheckBox();
JTextField MinimumRowsToShowTextField = new JTextField();
TableDetailsCheckBox.setText("Show Table Details");
    TableDetailsCheckBox.addItemListener(new Frame1_TableDetailsCheckBox_itemAdapter(this));

MinimumRowsToShowTextField.setVisible(false);

void TableDetailsCheckBox_itemStateChanged(ItemEvent e) {
    if( MinimumRowsToShowTextField.isVisible() ){
      MinimumRowsToShowTextField.setVisible(false);
      MinimumRowsToShowTextField.setText("");
      System.out.println("bye bye");
    }
    else{
      MinimumRowsToShowTextField.setVisible(true);
      MinimumRowsToShowTextField.setText("");
      System.out.println("hi hi");
    }
}

class Frame1_TableDetailsCheckBox_itemAdapter implements java.awt.event.ItemListener {
  Frame1 adaptee;

  Frame1_TableDetailsCheckBox_itemAdapter(Frame1 adaptee) {
    this.adaptee = adaptee;
  }
  public void itemStateChanged(ItemEvent e) {
    adaptee.TableDetailsCheckBox_itemStateChanged(e);
  }
}

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Asked On
2003-01-17 at 12:02:42ID20462347
Tags

disappear

,

jbuilder

,

jtextfield

,

problem

,

setvisible

Topic

Java Programming Language

Participating Experts
2
Points
100
Comments
7

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Answers

 

by: conickPosted on 2003-01-17 at 12:15:56ID: 7749619

You want the textfield to appear if the checkbox is checked, right? If so, why not use that in your code instead of checking the visibility of the textfield?

For instance:
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
   //textfield.setVisible(true);
} else {
   //textfield.setVisible(false);
}

I hate generated code with a passion, it makes the simplest code is difficult to read.

 

by: bens2333Posted on 2003-01-17 at 13:54:25ID: 7750225

good point and what you mentioned looks good, BUT if i set the initial state of the jtextfield to NOT be visible it is never displayed. if i set it be VISIBLE after two mouse clicks of the check box it works just fine... here is the code.

//MinimumRowsToShowTextField.setVisible(false);

void TableDetailsCheckBox_itemStateChanged(ItemEvent e) {
    if( TableDetailsCheckBox.isSelected() ){
      MinimumRowsToShowTextField.setVisible(true);
      MinimumRowsToShowTextField.setText("");
      System.out.println("hi hi");
    }
    else{
      MinimumRowsToShowTextField.setVisible(false);
      MinimumRowsToShowTextField.setText("");
      System.out.println("bye bye");
    }

  }

Is there a reason the jtextfield can not be made visible if it is run  as jcheckbox.setVisible(false)?

 

by: objectsPosted on 2003-01-17 at 14:07:11ID: 7750339

try this:

void TableDetailsCheckBox_itemStateChanged(ItemEvent e) {
   if( TableDetailsCheckBox.isSelected() ){
     MinimumRowsToShowTextField.setVisible(true);
     MinimumRowsToShowTextField.setText("");
     System.out.println("hi hi");
   }
   else{
     MinimumRowsToShowTextField.setVisible(false);
     MinimumRowsToShowTextField.setText("");
     System.out.println("bye bye");
   }
   JComponent parent = (JComponent) MinimumRowsToShowTextField.getParent();
   parent.revalidate();
 }

 

by: bens2333Posted on 2003-01-17 at 14:19:05ID: 7750437

objects,
   what the ???.... it worked perfect... WHY? please tell why that work, and what did i do???

 

by: bens2333Posted on 2003-01-17 at 14:19:46ID: 7750440

wow it work... why why why????how???

 

by: objectsPosted on 2003-01-17 at 19:42:45ID: 7751604

when you affect the layout of visible components, you need to inform the container that it needs to re-layout the components.

Thanks for the points :)

http://www.objects.com.au/staff/mick
Brainbench MVP for Java 1
http://www.brainbench.com

 

by: conickPosted on 2003-01-18 at 13:08:03ID: 7754048

Oh whoops. I didn't even notice that it wasnt be revalidated.

I guess thats why objects gets paid the big bucks. :)

20120131-EE-VQP-002

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