How to listen for a change in a JTextArea?

well ..... the subject says it all :)

The JavaDoc says it all :)
The java.awt.TextArea could be monitored for changes by adding a TextListener for TextEvents. In the JTextComponent based components, changes are broadcasted from the model via a DocumentEvent to DocumentListeners. The DocumentEvent gives the location of the change and the kind of change if desired. The code fragment might look something like:
DocumentListener myListener = ??;
JTextArea myArea = ??;
myArea.getDocument().addDocumentListener(myListener);http://java.sun.com/j2se/1.4/docs/api/javax/swing/JTextArea.html
Col

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[svn:fx-trunk] 12481: Because of the Change/Changing changes in VideoPlayer , we need to also listen for a CHANGE as well as the CHANGE_END, CHANGE_START, THUMB_PRESS, and THUMB_RELEASE events.

Revision: 12481
Revision: 12481
Author:   [email protected]
Date:     2009-12-03 18:48:17 -0800 (Thu, 03 Dec 2009)
Log Message:
Because of the Change/Changing changes in VideoPlayer, we need to also listen for a CHANGE as well as the CHANGE_END, CHANGE_START, THUMB_PRESS, and THUMB_RELEASE events.
Also, when clicking on the track and animating, the scrubbar's playedArea should move along with the thumb. We do this by using pendingValue, rather than value in updateSkinDisplayList().
QE notes: -
Doc notes: -
Bugs: SDK-24528
Reviewer: Kevin
Tests run: checkintests
Is noteworthy for integration: No
Ticket Links:
    http://bugs.adobe.com/jira/browse/SDK-24528
Modified Paths:
    flex/sdk/trunk/frameworks/projects/spark/src/spark/components/VideoPlayer.as
    flex/sdk/trunk/frameworks/projects/spark/src/spark/components/mediaClasses/ScrubBar.as

My first observation is that you don't reraise the error in the CATCH handler. That is bad, because it makes the proceedure fail silently which may be very difficult to troubleshoot.
The version numbers for Change Tracking are indeed database-global. MIN_VALID_VERSION can be different for different tables, if they have different retention periods. But if they all have the same retention period, it seems likely that MIN_VALID_VERSION
would increase as the database moves on.
I'm not sure about your question Can we use the CHANGE_TRACKING_CURRENT_VERSION even though we want to download subset of data from the table (only records matching for one data_source_key at a time). Where would you use it? How would you use
it?
Erland Sommarskog, SQL Server MVP, [email protected]

Listen for Layer Changes?

Hi
I am looking at subscribing to network events and working out event ids and things and so far haven't been able to work out this. Fairly simple question, hopefully the answer is just as simple.
Can I subscribe to an event which lets lets me listen for any layer changes (in my iOS app)? The docs suggest any actionable event can be listened for, but I am yet to work out how to do this.
Thanks.

If you're using a web front end I don't see how that's possible unless you have persistent connections and "push" technology. HTTP is a request/response protocol, which doesn't lend itself to this problem.
If you're writing a Swing client you have a bit more control.
Maybe one way to do it would be to use JMS publish/subscribe. When a client connects to the server, it subscribes to the database change topic. Whenever one of the registers clients makes a database change, the DAO puts a message on the topic, which is then broadcast out to all registered subscribers. They can update themselves in their onMessage() listener implementation.
Could be a network traffic nightmare if you have a lot of clients. And what about transactions? Will you make the topic and the database transaction a single unit of work?
Might be more complicated than it's worth, but that seems to be your requirement. Not a trivial problem.
%

Listening for file changes

i have a properties file. I need to monitor for the changes to the file and send intimation to all the files using the properties file. How shall i do it with out modifying the files which are executing it. i.e i need to suspend the execution of the threads and reload the values.

set up a File object that represents the props file.
File f = new File ("propsFile"); On start up, note the lastModified() time
In a low priority thread, keep polling the lastModified() method to check if the file has been reloaded.
Set up an event handler mechanism to notify and call all interested objects that would want to take some action if and when the file's been modified.
ram.

How to listen for key press when air app does not have focus

Hi,
I am developing a application in air and part of the functionality I need is the ability for the app to listen for when a specific key is pressed, even when the air app does not have focus.
Is there support for this for windows or mac? If not, how might this be accomplished? ANE?

Ok Mr. Smartass...Ok
I'm building a browser that is always open, and when
a user presses Ctrl+F1 (notice, just those two keys,
I don't care what else they press...) the browser
will open up. That way, you don't have to wait for it
to load all the time.You have two ideas here. One is having a universal key map that always gets ctrl-f1 sent to your app. The other is a program that is constantly running so that you don't have to wait for it to open up. The former is not possible (and this is a good thing) As warneria and I have been saying, it is bad design for an app to try to force an OS to implement this kind of feature.
If you're not going to help please don't post at all;
it's a waste of time for both you, me, and anyone
else who may need help on the same subject. Why wouldBelieve it or not, I am helping you.
See
http://www.google.com/search?hl=en&lr=&q=programming+code+side+effects
and
http://www.faqs.org/docs/artu/ch04s02.html
"Doug McIlroy's advice to �Do one thing well� is usually interpreted as being about simplicity. But it's also, implicitly and at least as importantly, about orthogonality."
anyone in their right mind who's trying to steal
people's passwords come out and say, "I'm not trying
to steal people's passwords!"wait, your question is why would someone trying to steal passwords say I'm not trying to steal passwords? I think duplicitous people in their right minds might try to trick you that way.
Beyond that, even if you're not a malicious hacker - and I am sure you are not - if someone posts a solution to your problem, malicious coders then will have learned how to do it. If you think you're programming or using these forums in a bubble, you are not.

How to listen for inputs without a component? For creating bots

I mean, for example, I want to write a a program that listens for keys f12 to (for example) skip the track in a media player and f11 to skip back. Thinks like the like :P. But I want to do this without any component, becasue the program won't have the focus at all.
If it is needed to create a dll just tell as much as you pacience affords.

I mean, for example, I want to write a a program that
listens for keys f12 to (for example) skip the track
in a media player and f11 to skip back. Thinks like
the like :P. But I want to do this without any
component, becasue the program won't have the focus
at all. >Translation : I need a system keylogger.
You can't do this in Java. And it will be OS specific.

How to listen for cell selection changes within a JTable

Problem: my table has 8 columns, with 4 of them containing very large text (up to 1000 chars). Solution is to set the initial size these columns so that the 1st 20 chars are visible, and if one of these columns gains focus/selection via mouse-clicking/tabbing/arrow keys, the entire text is shown in a JTextArea below the table.
I added a ListSelectionListener to the table, but this only informs me when the row selection has changed.
I added a FocusListener to the table, but this only informs me when the table gains/loses focus, not when it's been changed within.
I added a TableColumnModelListener to the TableColumnModel, but this only informs me when the column selection has changed.
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The LSL got me half way there, and the TCML got me the other half. Any ideas on how to combine?
Or is there something obvious that I'm missing?

Walter Laan wrote:
Use both and call the same method which updates the text area based on the current selected (or focused == lead selection index) cell.Yeah - that's what I figured. I just didn't know if there was a magic bullet (i.e., a single listener) out there that I was missing.
While you are at it, also add a table model listener which calls the same method if the selected cell is updated.I'll keep that in mind, but it's not necessary in this particular case. The table cells in question will be uneditable. The text area will have supporting Edit/Save/Cancel buttons.

How to add a listener for frame change

hello
Im quite new to jmf, and im writing a code which uses the webcam, but im stuck at a point where i want a listener which is called whenever the frame changes in the visualcomponent. so basically im looking for a frame changed listener to be added to the visual component instead of using a loop or a timer or something.
i just need a method to be called constantly along the stream coming from the webcam but which is consistent with the changing of the frames.
i would really appreciate any kind of help.
thank you

i thought there would be a listener or something ready to do thisThere is. It's the Rendered interface, which has a callback everytime data is received. If you want to create a custom renderer that is triggered everytime data is available, you set a processor to use your renderer and when data is available, your process command will be called. Same as an event listener...but it's very advanced stuff to implement the renderer interface.
for example if u want to record a video ull need to capture every frame as soon as it comesNo, the video doesn't come to you a frame at a time. The video is already encoded somehow when you get it, so it's coming in as a stream just like it'll be going out to the file... It's a stream of bytes, not a stream of images... You're not digitizing here, you're transcoding.

How inDesign notify for any changes on document.?

How InDesign comes to know about any changes on document, but not saved. As it shows * on the name of document when it is opened and any changes.
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Are you just asking because you want to know, or do you have a problem you need to solve? I don't know how to write a program, but I think what your are describing is not an unusual thing for a program to do. The * tells you that changes have been made since the last save, and the program reserves a portion of memory for undo functions. I suppose a coder could tell you how it works, but I don't think it would help an average user to know, but that's just my opinion.

How to listen for actionContent button click event in View

Hello,
Doing this:
FlexGlobals.topLevelApplication.addEventListener('actionContentClick',showOptions);
Results in calling showOptions() as many times as the view was showed. The handler sticks and each time I enter a view in the creationComplete hander for it I add the same listener over and over again.
How should this be done?
1. FlexGlobals.topLevelApplication is the right object to listen to?
2. I can remove the listener on view deactivate, but I am not sure if that will be called each time the view goes away.
3. Can I check if an object already has a listener and which is it?
Thank you.

Thank you, Tom.
I was complicating things for myself by exposing methods in the main MXML file to add and remove and listen to click events on a button placed in the actionContent, instead of declaring it in MXML for each and adding a listener to it. Views had different actionContent buttons or rather icons for them.
In regards to hasEvenListener, can I also get the method(s) attached to that? Probably not though.

Event to listen for nearID change

Hello,
it appears that Stratus NetConnection nearID changes pretty frequently for me while connected to Stratus (at least lately).
I couldn't find where I can be notified when nearID changes. Could you help? Thanks in advance.
-Kirill

Thank you Michael.
It just seems odd - and probably related to recent Stratus downtime/bandwidth experience - but my application takes several multi-second tries to connect to a server. Maybe it's just slow.
Another problem I've been experiencing lately (definitely related to something on Stratus servers) is netConnection being dropped randomly. It simply disconnects after a minute or two about 90% of the time. I'm glad I can at least test my application, hoping these problems will go away soon.
I think it's great what you guys at Adobe are doing with Flash and Stratus. If you had a Stratus logo designed, I'd definitely put that in my game's title screen.
-Kirill

JPopopMenu: how to listen for ActionEvent ?

Geary II says "The only information that can be obtained from an instance of PopupMenuEvent is the source of the event".
How do you ascertain what menu item the user selected?

User hasn't selected an item. It's a popupmenu event... meaning the menu has just popped up

How to listen for resizing of JTable column

Is there anyway to tell when the columns in a JTable are being resized by the user? I couldn't find any listeners or anything that will tell you when the user is dragging the column width with the mouse.
Thanks.

Use ColumnModelListener as shown below:-
          table.getColumnModel().addColumnModelListener(new TableColumnModelListener() {
               public void columnAdded(TableColumnModelEvent e) {
               public void columnMoved(TableColumnModelEvent e) {
               public void columnRemoved(TableColumnModelEvent e) {
               public void columnMarginChanged(ChangeEvent e) {
               public void columnSelectionChanged(ListSelectionEvent e) {
          });

Listen for change in JTextField

I would like to write an event listener to listen for any changes made to a JTextField. Normally I would think that keyListeners would do the trick except that the contents of this field can be altered by the application itself, and I would like to trap those changes too.
Does anyone know of an event listener that listens for any changes made in the text of a JTextField, regardless of how those changes are made?

use DocumentListener
for more info see http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#doclisteners

Lisetening for Property change

I have created a MC to be used as a button. It is generic and
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I am confused as to what approach I can take within the MC's
onRelease statement that would allow the parent to 1> know the
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been clicked (without putting onRelase code for each instance at
the parent level).
I was trying the following...
myMC.onRelease = function() {
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...but I couldn't figure how to make the parent listen for a
change to clickedButton.
How can I listent for a variable change? Is there a better
approach?
thx,
Nathan

Looks like I can answer my own question. In case anyone else
is confused as to how to do this, I used the Object.watch method.
After doing the above in the MC, I included the following in
the parent...
var btnWatcher:Function = function(prop, oldVal, newVal,
userData) {
trace(newVal);
this.watch("clickedButton", btnWatcher);

How to listen for a change in a JTextArea?

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