Solved

Disabling group of components

Posted on 1998-09-17
8
205 Views
Last Modified: 2008-03-17
I have a group of Swing components (text fileds, combo boxes, buttons) which have to be disabled when certain event takes place. I wonder whether there is more elegant way of doing that than calling setEnabled(false) on each of them individually.
0
Comment
Question by:msmolyak
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 3

Expert Comment

by:mjenkins
ID: 1224477
What you could do is to create an Action class that disables or enables all of the components at once, Your ActionAdapter would take care of it for you. I believe that this is discauused in the Javadocs for Action.class
0
 
LVL 3

Expert Comment

by:mjenkins
ID: 1224478
Just in case that wasn't clear, I meant:

com.sun.java.swing.Action
0
 
LVL 5

Expert Comment

by:fontaine
ID: 1224479
If the components to enable/disable are in the same container, you could replace it by a
more clever one:

public class CleverPanel extends JPanel { // for example

   //...
   public void setEnabled(boolean b) {
       for (int i=0; i< getComponentCount(); i++) {
            Component c = getComponent(i);
            c.setEnabled(b);
       }

       return;
   }
}

Like this, you only need to invoke setEnabled() on the container to have all the components
inside enabled/disabled.
0
 
LVL 5

Author Comment

by:msmolyak
ID: 1224480
mjenkings, thank you for the proposed answer. Your solution is a good one, however I decided to go with the fontaine's proposal for the following reasons:

1. All the components I need to enable/disable are indeed inside a panel.
2. fontaine's soultion does not assume that the components are ActionListeners or that they can be creates based on an Action.
3. In this solution code changes are less substantial, they affect only the panel and not any of the subcomponents.
4. Enabling and disabling is easier, I simply have to call setEnabled() on a container rather than deal with events (the event which causes the components to be enabled/disabled is not an ActionEvent but a list selection event).

Bertrand, the points are yours!
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 5

Author Comment

by:msmolyak
ID: 1224481
Sorry, mjenkins, I misspelled you name.

Michael
0
 
LVL 4

Expert Comment

by:evijay
ID: 1224482
another crude and wild idea is to use the glasspane feature of swing  is disable a group of components.

The idea is to set your own custom glass pane and position and resize it to exactly take the
place of the container. (when ever the Jpanel which needs to be disabled changes its size and position), move the glass pane to that place and resize it too.


http://java.sun.com/docs/books/tutorial/ui/swing/rootpane.html#glasspane

see this question of week from developer.javasoft.com site

Question: How do you ignore user input in a Swing application?

              The user has just pressed a button in an application and the operation will
              take some time. You want to put the application in a busy state. How do you
              get the application to ignore user input?

               Answer:

              setEnabled(false) on the frame should work. Unfortunately if you call
              Frame.setEnabled(false), the interface goes blank. To block input without
              hiding the interface, try using a "glasspane". You can set the glasspane visible
              to intercept events before they reach the underlying components.

              Check out:
              http://java.sun.com/docs/books/tutorial/ui/swing/rootpane.html#glasspane
              which has examples of glasspane usage.


see this example

http://java.sun.com/docs/books/tutorial/ui/swing/example-swing/GlassPaneDemo.java

Thanx
vijay

0
 
LVL 5

Accepted Solution

by:
fontaine earned 50 total points
ID: 1224483
If I understand well, I can lock the question...
0
 
LVL 5

Author Comment

by:msmolyak
ID: 1224484
Vijay, It is an interesting suggestions to use a glasspane. However the disadvantages of that approach are (correct me if I am wrong): it looks like it is more difficult to implement and (the main one) even though it does shield the components from the mouse events it does not make them look disabled. That the glasspane does not make it obvious to the user that this button and this text field are disabled. If you disable the components, the changes in background and font color do make it obvious.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For customizing the look of your lightweight component and making it look opaque like it was made of plastic.  This tip assumes your component to be of rectangular shape and completely opaque.   (CODE)
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now