Event Handling...advice
Hi,
I'm coding up a GUI application and i need to handle many ActionEvents and other events too. What i'm doing now is having my top level class implement the ActionListener and then making 'this' the action listener for all my action events. When it comes to knowing which component fired the event i use getSource() method from the ActionEvent class. I'm not sure whether this is a good practice coz for the moment i have like 15 if(e.getSource == someComponent) statements. If you guys could advise me on whether this is ok or i should have more ActionListeners and each one of them would handle one event for one component. The problem is that i hate inner classes coz they seem to make the code somehow difficult to read (my own opinion you could advise on that too), i also thought of making my class implements even more event listeners and this way i would just need to implement the abstract methods corresponding to each event class. Any help would be much appreciated
I always use action commands... set the action command on a button, then check the action command in your actionPerformed method. The only reason I do that is so I can easily make another button, menu, etc perform the same action. Other then that I think that your practice is pretty common.
Similar Messages
-
Event handler in later sequence frame is handling my event
Consider a case where you have a sequence with two frames. Each frame has an event handler. If you are in frame 0 processing events, do you think that the event handler in frame 1 should have any relevance? The attached vi demonstrates that it does. This seems like a bug to me or at least something to watch out for. I spent a half-day trying to figure this one out.
kc64 wrote:
I read the caveats and recommendations several times. I recognize that my example vi shows two event structures in one loop but, in my application , this is not the case. I don't see any clear instruction on that help page that would indicate that I have broken some rule of event structure use.
That's bothersome. I use sequences all the time and nobody has ever commented that my code is badly designed. I wonder why NI provides that function if it promotes poor code design. You did say "often" and not "always" so I have an out. :^)
Well, maybe they missed something in the caveats But using more than one Event Structure is not a good idea.
I just posted something to that effect this morning: http://forums.ni.com/ni/board/message?board.id=170&thread.id=337440
As for using a sequence structure (especially Stacked Sequences), I totally agree with Denis that it is poor design. Unfortunatley, NI cannot remove them from the palette due to compatibility with older versions. I would vote that they be removed ASAP.
However, it is your choice to follow other people's advice or not to follow it.
R -
Hi all,
We have created an Event handler using the Status Attribut profile attach to it. Now i am posting an Event using Idoc to Change the status of it.
Could you pls advice Why status is not getting changed.
Regards,
VikramNevermind. I fixed it.
-
Make asynchronous event handler as synchronous using Powershell
Hi All,
Using custom coding i am able to change the asynchronous event handle to synchronous.
Can anybody let me know Is there any other way to change the same. Like Powershell script or any.
Without deploying the solution i want to change the event handler type.
Please advice.
Thanks & Regards
MD.Liakath ali
Hi
you can use power shell to do so
Add-PSSnapin Microsoft.SharePoint.PowerShell –erroraction SilentlyContinue
$web = Get-SPWeb -Identity http://...
$list = $web.GetList($web.Url + "/Lists/" + “list name”)
$type = "ItemAdded" #or any other type, like ItemDeleting, ItemAdding, ItemUpdating, ...
$numberOfEventReceivers = $list.EventReceivers.Count
if ($numberOfEventReceivers -gt 0)
for( $index = $numberOfEventReceivers -1; $index -gt -1; $index–-) {
$receiver = $list.EventReceivers[$index] ;
$name = $receiver.Name
$typ = $receiver.Type ;
if ($typ -eq $type) #or you can check ($name -eq "event receiver's name") if you have more then one event receivers of the same type
$receiver.Synchronization = "Synchronous"
$receiver.Update()
Write-Host "Event receiver " $name " is changed to Synchronous"
else
Write-Host " There is no EventReceiver of type " $type " registered for this list "
$web.Dispose()
or
$list = (get-spweb http://sharepoint/sites/test).lists['somelist']
$def = $list.EventReceivers.Add()
$def.Assembly = "MyReceiverAssembly, Version=1.0.0.0, Culture=Neutral,PublicKeyToken=a00000000a000ce0"
$def.Class = "MyReceiverAssembly.MyReceiverClass"
$def.Type = [Microsoft.SharePoint.SPEventReceiverType]::ItemAdded
$def.Name = "My ItemAdded Event Receiver";
$def.Synchronization = [Microsoft.SharePoint.SPEventReceiverSynchronization]::Synchronous
$def.Update()
this should be done at each level where list is present.
or you can Edit the Elements.xml file of the event receiver in(14 hive layouts/feature folder) and set the synchronization element as below..
<Synchronization>Synchronous</Synchronization>
Synchronous</Synchronization> https://naimmurati.wordpress.com/2012/03/22/add-modify-or-delete-list-event-receivers-with-powershell/">https://naimmurati.wordpress.com/2012/03/22/add-modify-or-delete-list-event-receivers-with-powershell/
Regards,
Rajendra Singh
If a post answers your question, please click Mark As Answer on that post and Vote as Helpful
http://sharepointundefind.wordpress.com/ -
Event Handling - Swing Window to Console Switch
I have a serious problem with an app I am writing - I have a swing 'main menu' system built around a standard JFrame which calls a new instance of another class. This other class takes input from the keyboard and is displayed in the standard console window; i.e Using the standard System.out.print() syntax.
My problem is the Swing window will not release the input stream to allow the conole to take input from the keyboard. I have implemented inner-classes within the 'main menu's' class for event handling purposes; in this case the mouse-clicks of the menu's JButton components. The problem only manifests itself when the inner-class' event handling code is called - I wrote some test methods to call the console classes code without using the inner-class' and the console works perfectly. It is my conclusion, therefore, that the calling of the console-based method from within the inner-class of the Swing super-class reserves the input for the Swing components, failing to reactivate the console. I have tried creating new InputStream objects but to no avail.
Does anyone know how to release or terminate the methods within the inner-classes (they are all void / no return type as they implement the ActionListener abstract class)? This, I hope, will return the focus to the console.
Any advice would be most greatfully received.
LEC.If you were to have your connection object declared so that it could be referenced from anywhere in your class then you could use it in you actionPerformed method. For example:
public class Test extends JFrame
   private Connection con = null;
   public void actionPerformed(ActionEvent e)
   {
      MyDetails appmydet = new MyDetails(con, id); //connection, userID
      appmydet.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
   }
   public void setConnection(Connection theCon)
   {
      con = theCon;
   } -
This is an odd idea we have not seen discussed in the books we have read or even on this forum. Still we think the problem I have to solve must be common. Can you give us some advice ?
In our app, we get events coming in from a server reading devices. We want to update the UI when this happens. We also want to allow users to update and interact with the UI as they normally do. Sometimes the user interaction causes a change in the UI that can also be caused by one of the events arriving from the server - we display a different perspective for some events and the user can also trigger the display of the same perspective.
To make a long story short,we had the idea of routing all the events to a single central event handling class whch would perform the UI updates as needed. That is, we did not want to perform UI updates the way we commonly saw in examples, where actionPerformed() methods in many UI classes end up updating the UI, because some similar functionality would have to be built in a class that handles the events from the server and we did not want to duplicate code. So we would still have actionPerformed() in each UI class, but these methods would simply delegate to methods provided by the central handler rather than take any action themselves. We end up passing reference ti UI objects sometimes.
But we have some concerns because we are not highly experienced Swing developers and we have not seen any examples of doing things this way. Is this just a dumb idea ? Any advice or opinions would be appreciated.
Thanks !!That is a good point, fritzthecat !
We are doing this ... using SwingUtilities.invokeLater(), I mean ... for UI updates. Right now we are thinking about ways to pass data to the UI using this method - we receive events containing some data which the UI will use for lookups or display. It looks like we can create an object encapsulating the data (as a final object) and pass it to an appropriate UI component method for display like this :
final EventObject eventObject = new EventObject( hashTableFullOfData );
SwingUtilities.invokeLater( new Runnable()
public void run()
uiComponent.doSomethingWithData( eventObject );
);I dunno ... seems reasonable ... do you see problems with this idea ?
By the way ... we do have the excellent book Swing 2nd Edition by Robinson and Vorobiev. ANyone have any recommendations for other sources ?
Thanks for the reponses !!! -
OIM 11g: Event Handler Packaging/Deployment
Need some advice/guidance on best practices for packaging/deploying Event Handlers in OIM 11g.
In our OIM 9.1 environment, we organized all of our custom code by "functional area" so we have JAR's named oim-common.jar, oim-ad.jar, oim-oid.jar, etc. Within each one of these JAR's we have all adapter code, scheduled tasks, and 10g event handlers related to that area. This approach was done to promote code reuse and make unit testing easier.
From what I've read on 11g Event Handlers, it sounds like each event handler needs to be packaged as a plugin along with it's own JAR so that we'd have one JAR per event handler. So, if we have 100 event handlers, we'd need 100 JAR's? Is this required or can our plugin ZIP files just contain the XML definitions as long as the referenced classes are on the classpath?Gyanprakash Pandey wrote:
You should have a separate plugin package for each event handler. Practically we should have number of event-handlers as less as possible. If there are more event-handlers we must modify the design as event handler cause performance issues.
Regards,
GPHi Gyanprakash,
I'm going to use event handlers in my project, so I'm interested very much in hearing about the performance issues.
Besides, I do not see why I shall package every handler separately. Is this intended behavior or because of some bugs in OIM?
Regards,
Vladimir -
How can I execute an external program from within a button's event handler?
I am using Tomcat ApacheTomcat 6.0.16 with Netbeans 6.1 (with the latest JDK/J2EE)
I need to execute external programs from an event handler for a button on a JSF page (the program is compiled, and extremely fast compared both to plain java and especially stored procedures written in SQL).
I tried what I'd do in a standalone program (as shown in the appended code), but it didn't work. Instead I received text saying the program couldn't be found. This error message comes even if I try the Windows command "dir". I thought with 'dir' I'd at least get the contents of the current working directory. :-(
I can probably get by with cgi on Apache's httpd server (or, I understand tomcat supports cgi, but I have yet to get that to work either), but whatever I do I need to be able to do it from within the button's event handler. And if I resort to cgi, I must be able to maintain session jumping from one server to the other and back.
So, then, how can I do this?
Thanks
Ted
NB: The programs that I need to run do NOT take input from the user. Rather, my code in the web application processes user selections from selection controls, and a couple field controls, sanitizes the inoputs and places clean, safe data in a MySQL database, and then the external program I need to run gets safe data from the database, does some heavy duty number crunching, and puts the output data into the database. They are well insulated from mischeif.
NB: In the following array_function_test.pl was placed in the same folder as the web application's jsp pages, (and I'd tried WEB-INF - with the same result), and I DID see the file in the application's war file.
try {
java.lang.ProcessBuilder pn = new java.lang.ProcessBuilder("array_function_test.pl");
//pn.directory(new java.io.File("K:\\work"));
java.lang.Process pr = pn.start();
java.io.BufferedInputStream bis = (java.io.BufferedInputStream)pr.getInputStream();
String tmp = new String("");
byte b[] = new byte[1000];
int i = 0;
while (i != -1) {
bis.read(b);
tmp += new String(b);
getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + tmp);
} catch (java.io.IOException ex) {
getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + ex.getMessage());
}Hi Fonsi!
One way to execute an external program is to use the System Exec.vi. You find it in the functions pallet under Communication.
/Thomas -
Copying text to the clipboard in AVDocDidOpen event handler causes Acrobat 9 to crash
I'm trying to copy the filename of a document to the clipboard in a plugin with my AVDocDidOpen event handler. It works for the first file opened; however when a second file is opened, Acrobat crashes. The description in the application event log is: "Faulting application acrobat.exe, version 9.1.0.163, faulting module gdi32.dll, version 5.1.2600.5698, fault address 0x000074cc."
I've confirmed that the specific WIN32 function that causes this to happen is SetClipboardData(CF_TEXT, hText); When that line is commented out and remaining code is left unchanged, Adobe doesn't crash.
Is there an SDK function that I should be using instead of WIN32's SetClipboardData()? Alternately, are there other SDK functions that I need to call be before or after I call SetClipboardData()
Bill EricksonLeonard,
I tried it with both "DURING, HANDLER, END_HANDLER" and "try catch," as shown below. However, it doesn't crash in the event handler; it crashes later, so the HANDLER/catch block is never hit.
The string that's passed to SetClipboardData() is good, because I'm able to paste it into the filename text box of the print dialog when I try to create the "connector line" PDF. I also got rid of all the string manipulation and tried to pass a zero-length string to the clipboard but it still crashes.
Here's the code:
ACCB1 void ACCB2 CFkDisposition::myAVDocDidOpenCallback(AVDoc doc, Int32 error, void *clientData)
PDDoc pdDoc = AVDocGetPDDoc(doc);
char* pURL = ASFileGetURL(PDDocGetFile(annotDataRec->thePDDoc));
if (pURL) {
if (strstr(pURL, "file://") && strstr(pURL, "Reviewed.pdf")) {
// Opened from file system so copy filename to clipboard for connector line report
char myURL[1000];
strcpy(myURL, pURL);
ASfree(pURL); // Do this before we allocate a Windows handle just in case Windows messes with this pointer
pURL = NULL;
HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE, 1000);
if (hText) {
try
// Skip path info and go right to filename
char *pText = (char *)GlobalLock(hText);
char *pWork = strrchr(myURL,'/');
if (pWork) {
strcpy(pText, pWork+1);
} else {
strcpy(pText, myURL);
char *pEnd = pText + strlen(pText); // Get null terminator address
// Replace "%20" in filename with " "
pWork = strstr(pText, "%20");
while (pWork) {
*pWork = ' ';
memmove(pWork+1, pWork+3, (pEnd - (pWork+2)));
pWork = strstr(pText, "%20");
// Append a new file extension
pWork = strstr(pText, ".pdf");
*pWork = 0; // truncate the string before ".pdf"
strcat(pWork,".Connectors.pdf");
GlobalUnlock(hText); // Must do this BEFORE SetClipboardData()
// Write it to the clipboard
OpenClipboard(NULL);
EmptyClipboard();
SetClipboardData(CF_TEXT, hText); // Here's the culprit
CloseClipboard();
GlobalFree(hText);
} catch (char * str) {
AVAlertNote(str);
if (pURL)
ASfree(pURL); -
Unable to get automatic event handling for OK button.
Hello,
I have created a form using creatobject. This form contains an edit control and Search, Cancel buttons. I have set the Search buttons UID to "1" so it can handle the Enter key hit event. Instead its caption changes to Update when i start typing in the edit control and it does not respond to the Enter key hit. Cancel happens when Esc is hit.
My code looks like this -
Dim oCreationParams As SAPbouiCOM.FormCreationParams
oCreationParams = SBO_Application.CreateObject(SAPbouiCOM.BoCreatableObjectType.cot_FormCreationParams)
oCreationParams.UniqueID = "MySearchForm"
oCreationParams.BorderStyle = SAPbouiCOM.BoFormBorderStyle.fbs_Sizable
Dim oForm As SAPbouiCOM.Form = SBO_Application.Forms.AddEx(oCreationParams)
oForm.Visible = True
'// set the form properties
oForm.Title = "Search Form"
oForm.Left = 300
oForm.ClientWidth = 500
oForm.Top = 100
oForm.ClientHeight = 240
'// Adding Items to the form
'// and setting their properties
'// Adding an Ok button
'// We get automatic event handling for
'// the Ok and Cancel Buttons by setting
'// their UIDs to 1 and 2 respectively
oItem = oForm.Items.Add("1", SAPbouiCOM.BoFormItemTypes.it_BUTTON)
oItem.Left = 5
oItem.Width = 65
oItem.Top = oForm.ClientHeight - 30
oItem.Height = 19
oButton = oItem.Specific
oButton.Caption = "Search"
'// Adding a Cancel button
oItem = oForm.Items.Add("2", SAPbouiCOM.BoFormItemTypes.it_BUTTON)
oItem.Left = 75
oItem.Width = 65
oItem.Top = oForm.ClientHeight - 30
oItem.Height = 19
oButton = oItem.Specific
oButton.Caption = "Cancel"
oItem = oForm.Items.Add("NUM", SAPbouiCOM.BoFormItemTypes.it_EDIT)
oItem.Left = 105
oItem.Width = 140
oItem.Top = 20
oItem.Height = 16
Dim oEditText As SAPbouiCOM.EditText = oItem.Specific
What changes do i have to make to get the enter key to work?
Thanks for your help.
Regards,
SheetalHello Felipe,
Thanks for pointing me to the correct direction.
So on refering to the documentation i tried out a few things. But I am still missing something here.
I made the following changes to my code -
oForm.AutoManaged = True
oForm.SupportedModes = 1 ' afm_Ok
oItem = oForm.Items.Add("1", SAPbouiCOM.BoFormItemTypes.it_BUTTON)
oItem.Left = 5
oItem.Width = 65
oItem.Top = oForm.ClientHeight - 30
oItem.Height = 19
oItem.SetAutoManagedAttribute(SAPbouiCOM.BoAutoManagedAttr.ama_Visible, 1, SAPbouiCOM.BoModeVisualBehavior.mvb_Default)
oButton = oItem.Specific
oButton.Caption = "OK"
AND
oForm.Mode = SAPbouiCOM.BoFormMode.fm_OK_MODE
oItem = oForm.Items.Add("1", SAPbouiCOM.BoFormItemTypes.it_BUTTON)
oItem.Left = 5
oItem.Width = 65
oItem.Top = oForm.ClientHeight - 30
oItem.Height = 19
oItem.AffectsFormMode = False
I get the same behaviour OK button changes to update and enter key does not work.
Could you please tell me find what is it that i am doing wrong?
Regards,
Sheetal -
Dropdown box - which event handler to use ?
I am having trouble with setting the readonly property (via Javascript) of the adjacent textbox to my dropdown box when the index value is a certain number.
I tried using MouseUp, MouseDown, and even OnBlur....but the readonly does not seem to be getting set to true or false consistently.
Could this be a timing issue ? The textbox that I am trying to control is the next tab-order control in the list of controls for this page.
This same logic is working fine in the MouseUp event handler for check boxes. So I am just wondering if this is a bug or must my implementation change to accomodate dropdown boxes ? For instance, should I move the logic to the Enter event handler of the textbox instead ? Can a control's own eventhandler set itself to readonly when it is the active form field ?After tons and tons of testing time, I've come to the conclusion that dropdowns are totally buggy in 11.0.07 release of Acrobat Pro.
Even if you set the "commit values immediately", you get the PRIOR selected item's value as the event value, not the CURRENT one.
This occurs in a Validate event handler script. I have not been able to use any other event handlers for a dropdown except the OnBlur....and then, for my purposes, IT'S TOO LATE !!!
This is totally worthless as I need to setFocus() and set fields to readonly based on the immediate dropdown offset or face value. -
Input value given on web page is not getting pickedup in event handler
Hi friends,
I have created one simple page in SE80 with program with flow logic option, in which I would like to show business partner details from BUT000 table with the input of partner number. But the thing is the input value(partner no.)which I am giving on web page is not getting picked up in selection in event handler though I am giving input value it is becoming initial while selecting. What could be the reason?
Below I am mentioning the code which I have written in even handler for OnInputProcessing event.
CASE EVENT_ID.
WHEN 'select'.
NAVIGATION->SET_PARAMETER( 'partner' ).
SELECT * FROM but000 INTO TABLE I_but000 WHERE partner BETWEEN partner AND partner1.
WHEN OTHERS.
ENDCASE.
Thanks in advance,
SteveHi Abhinav,
I tried with the one you posted. But it is giving run time error as shown below.
Note
The following error text was processed in the system CRD : Access via 'NULL' object reference not possible.
The error occurred on the application server crmdev_CRD_00 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: ONINPUTPROCESSING of program CLO24DDFJW575HVAQVJ89KWHEHC9OCP
Method: %_ONINPUTPROCESSING of program CL_O24DDFJW575HVAQVJ89KWHEHC9OCP
Method: DO_REQUEST of program CL_BSP_PAGE===================CP
Method: ON_REQUEST of program CL_BSP_RUNTIME================CP
Method: IF_HTTP_EXTENSION~HANDLE_REQUEST of program CL_HTTP_EXT_BSP===============CP
Method: EXECUTE_REQUEST_FROM_MEMORY of program CL_HTTP_SERVER================CP
Function: HTTP_DISPATCH_REQUEST of program SAPLHTTP_RUNTIME
Module: %_HTTP_START of program SAPMHTTP
Regards,
Steve -
How do I create an Event Handler for an Execute SQL Task in SSIS if its result set is empty
So the precedence on my entire package executing is based on my first SELECT of my Table and an updatable column. If that SELECT results in an empty result set, how do I create an Event Handler to handle an empty result set?
A Newbie to SSIS.
I appreciate your review and am hopeful for a reply.
PSULionRPDepends upon what you want to do in the eventhandler. this is what you can do
Store the result set from the Select to a user variable.
Pass this user variable to a Script task.
In the Script task do whatever you want to do including failing the package this can be done by failing the script task, which in turns fails the package. something like
Dts.TaskResult = Dts.Results.Failure
Abhinav http://bishtabhinav.wordpress.com/ -
Swing: when trying to get the values from a JTable inside an event handler
Hi,
I am trying to write a graphical interface to compute the Gauss Elimination procedure for solving linear systems. The class for computing the output of a linear system already works fine on console mode, but I am fighting a little bit to make it work with Swing.
I put two buttons (plus labels) and a JTextField . The buttons have the following role:
One of them gets the value from the JTextField and it will be used to the system dimension. The other should compute the solution. I also added a JTable so that the user can type the values in the screen.
So whenever the user hits the button Dimensiona the program should retrieve the values from the table cells and pass them to a 2D Array. However, the program throws a NullPointerException when I try to
do it. I have put the code for copying this Matrix inside a method and I call it from the inner class event handler.
I would thank you very much for the help.
Daniel V. Gomes
here goes the code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import AdvanceMath.*;
public class MathF2 extends JFrame {
private JTextField ArrayOfFields[];
private JTextField DimOfSis;
private JButton Calcular;
private JButton Ativar;
private JLabel label1;
private JLabel label2;
private Container container;
private int value;
private JTable DataTable;
private double[][] A;
private double[] B;
private boolean dimensionado = false;
private boolean podecalc = false;
public MathF2 (){
super("Math Calcs");
Container container = getContentPane();
container.setLayout( new FlowLayout(FlowLayout.CENTER) );
Calcular = new JButton("Resolver");
Calcular.setEnabled(false);
Ativar = new JButton("Dimensionar");
label1 = new JLabel("Clique no bot�o para resolver o sistema.");
label2 = new JLabel("Qual a ordem do sistema?");
DimOfSis = new JTextField(4);
DimOfSis.setText("0");
JTable DataTable = new JTable(10,10);
container.add(label2);
container.add(DimOfSis);
container.add(Ativar);
container.add(label1);
container.add(Calcular);
container.add(DataTable);
for ( int i = 0; i < 10 ; i ++ ){
for ( int j = 0 ; j < 10 ; j++) {
DataTable.setValueAt("0",i,j);
myHandler handler = new myHandler();
Calcular.addActionListener(handler);
Ativar.addActionListener(handler);
setSize( 500 , 500 );
setVisible( true );
public static void main ( String args[] ){
MathF2 application = new MathF2();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing (WindowEvent event)
System.exit( 0 );
private class myHandler implements ActionListener {
public void actionPerformed ( ActionEvent event ){
if ( event.getSource()== Calcular ) {
if ( event.getSource()== Ativar ) {
//dimensiona a Matriz A
if (dimensionado == false) {
if (DimOfSis.getText()=="0") {
value = 2;
} else {
value = Integer.parseInt(DimOfSis.getText());
dimensionado = true;
Ativar.setEnabled(false);
System.out.println(value);
} else {
Ativar.setEnabled(false);
Calcular.setEnabled(true);
podecalc = true;
try {
InitValores( DataTable, value );
} catch (Exception e) {
System.out.println("Erro ao criar matriz" + e );
private class myHandler2 implements ItemListener {
public void itemStateChanged( ItemEvent event ){
private void InitValores( JTable table, int n ) {
A = new double[n][n];
B = new double[n];
javax.swing.table.TableModel model = table.getModel();
for ( int i = 0 ; i < n ; i++ ){
for (int j = 0 ; j < n ; j++ ){
Object temp1 = model.getValueAt(i,j);
String temp2 = String.valueOf(temp1);
A[i][j] = Double.parseDouble(temp2);What I did is set up a :
// This code will setup a listener for the table to handle a selection
players.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = players.getSelectionModel();
rowSM.addListSelectionListener(new Delete_Player_row_Selection(this));
//Class will take the event and call a method inside the Delete_Player object.
class Delete_Player_row_Selection
implements javax.swing.event.ListSelectionListener
Delete_Player adaptee;
Delete_Player_row_Selection (Delete_Player temp)
adaptee = temp;
public void valueChanged (ListSelectionEvent listSelectionEvent)
adaptee.row_Selection(listSelectionEvent);
in the row_Selection function
if(ex.getValueIsAdjusting()) //To remove double selection
return;
ListSelectionModel lsm = (ListSelectionModel) ex.getSource();
if(lsm.isSelectionEmpty())
System.out.println("EMtpy");
else
int selected_row = lsm.getMinSelectionIndex();
ResultSetTableModel model = (ResultSetTableModel) players.getModel();
String name = (String) model.getValueAt(selected_row, 1);
Integer id = (Integer) model.getValueAt(selected_row, 3);
This is how I got info out of a table when the user selected it -
Hello all,
I have a problem with event handling. I have two buttons in my GUI application with the same name.They are instance variables of two different objects of the same class and are put together in the one GUI.And their actionlisteners are registered with the same GUI. How can I differentiate between these two buttons?
To be more eloborate here is a basic definition of my classes
class SystemPanel{
SystemPanel(FTP ftp){ app = ftp};
FTP app;
private JButton b = new JButton("ChgDir");
b.addActionListener(app);
class FTP extends JFrame implements ActionListener{
SystemPanel rem = new SystemPanel(this);
SystemPanel loc = new SystemPanel(this);
FTP(){
add(rem);
add(loc);
pack();
show();
void actionPerformed(ActionEvent evt){
/*HOW WILL I BE ABLE TO KNOW WHICH BUTTON WAS PRESSED AS THEY
BOTH HAVE SAME ID AND getSouce() ?
In this case..it if was from rem or loc ?
} It would be really helpful if anyone could help me in this regard..
Thanks
Hari VigenshHi levi,
Thankx..
I solved the problem ..using same concept but in a different way..
One thing i wanted to make clear is that the two buttons are in the SAME CLASS and i am forming 2 different objects of the SAME class and then putting them in a GUI.THERE IS NO b and C. there is just two instances of b which belong to the SAME CLASS..
So the code
private JButton b = new JButton("ChgDir");
b.setActionCommand ("1");
wont work as both the instances would have the label "ChgDir" and have setActionCommand set to 1!!!!
Actually I have an array of buttons..So I solved the prob by writting a function caled setActionCmdRemote that would just set the action commands of one object of the class differently ..here is the code
public void setActionCommandsRemote()
for(int i = 0 ; i <cmdButtons.length ; i++)
cmdButtons.setActionCommand((cmdButtons[i].getText())+"Rem");
This just adds "rem" to the existing Actioncommand and i check it as folows in my actionperformed method
if(button.getActionCommand().equals("DeleteRem") )
deleteFileRemote();
else if(button.getActionCommand().equals("Delete") )
deleteFileLocal();Anyway thanx a milion for your help..this was my first posting and I was glad to get a prompt reply!!! -
Enhance standard class with event handler method
In trying to enhance a standard class with a new event handler class, I find that the ECC 6.0 EHP4 system does not appear to recognise the fact the method is an event handler method. The specific example is a new method to handle the event CL_GUI_ALV_GRID->USER_COMMAND.
I notice that the flag called Active has not been ticked - see image below. Perhaps this is the reason why the event handler is not being triggered.
Note that there is an event handler for the same event in the standard class which obviously is executed as expected. Any ideas on limitations in the system or I am missing a step?
Thanks
JohnThank you for your replies.
There is a bug in the ALV handler of a standard SAP class (when executed in ITS WebGUI) and I was hoping to create a custom event handler as an Enhancement to execute some custom code to sort of "handle the bug".
I agree - ideally it should be done in a Z class but that will not give me access to the object methods and attributes of the enhanced class.
Cheers,
John
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