Forum interface event handling
Perhaps an issue of performance, but I just noticed the following, which seems to indicate a misbehavior of the OTN forum software in regard to sequentially processing or canceling previous interface events.
While browsing my communications page, I accidentally clicked on a username instead of the subject to browse the message. I realized the mistake and immediately clicked on the right section. It showed the message. However, a minute later or so, the screen refreshed and it showed the user's BIO profile.
Depends on the web item. Check out CLRSRWWW ABAP Classes.
Similar Messages
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Trajectory program event handling
Nobody else responded to my question on the subject "Trajectory" in Java Programming forum. See my post history for problem description and code. Perhaps the subject is more appropriate here as an event handling issue. Who has the technical savvy to attempt a solution?
(2) I wouldn't have problem with separate classes as
long as I have no inner classes and the program
essentially works. Sure, one 10,000 - line class may also work fine. However, it is reccommended do not make classes
(as well as source files) very large. The reason is that long file is more difficult to debug.
Second reason why i advised you to do that is that you mix in one class Trajectory (which is about 2000 lines long!!!) all - interface, event handling, calculations, parts responsible for 2D panel processing....
Well, this is not Java is supoposed to be used for.
(3) Creating object of class Falling object is
something I'll consider. If you could show me a brief
code example, I'll understand more.
class fallingObject
private double mass;
private double speed;
Position[] trajectory = new Position[1000]; // Create class Position each object of which holds only
// 2 variables - x and y
//all initial data related to this object
fallingObject(double mass, double speed , /* the rest ........*/)
this.mass = mass;
this.speed = speed;
moveObject();
//and so on
// some methods you need
private moveObject ()
// perform all calculations
// fill array
// etc
Now, because all except trajectory array and constructor is private you cannot change this object outside
class. This means that if something goes wrong with calculations, you check only this class and nothing else. In your case you can change some variable at lines 1352 and 122 - you have to check all program to find bug. Here you have to check only this class.
You may also supply this class with mutators and accessors
public double getMass()
return mass;
public void setMass(double mass) // only if you really need this
this.mass = mass;
The time interval
is a tricky parameter since not all calculations work
properly with input data; check input
the logic would require more
complexity and possibly cause run time problems;
automatically testing for the appropriate time
interval could also reduce program efficiency. Dont think so. You can calculate time of falling and divide it by 1000, for instance.
It will take very short time.
I don't
want to set a limit for array points to 1000 or less
since the precision becomes limited and the power of
the program can be hurt severely since the time
duration would be restricted to less than 16 2/3
minutes( 1 second per array index increment). Dont use real time simulation. There is no sence in it. You just want to show how object is falling.
Also, I
don't think the array size can't be changed during a
program run although I have set a much higher maximum
value for array size. Theres no need to change array size.
(4) Erasing data from textfields is something I desire
as a calculation reset feature since it should signal
user that it expects new data and not looking at old
data; however, I might consider additional variables
to hold the data. Well, man, it was quite irritating to type them in. So many fields. User is not stupid,
he knows that he can input other data. Almost anybody will leave this page and wont want to
fill fields again. You have to think about user, not about what you want.
(5 )BTW, what I have in the array doesn't have the
same precision as with the calculation mode. The 2D
simulation uses less precise data to become visually
practical for comprehension of users. But perhaps I
need more than one type of array, but then again,
performance could be a problem.
(6) I thought the program already does take parameters
from text fields and start again. This is what I
desire anyway so I'm not sure why I need new start
feature.
(7) Restart animation seems unaccepatble since I
prefer to treat each simulation as something based on
new calculation data.
I would have initially set up the program with OOD
emphasis, but the original intent was a java
conversion of a a C++ program that needed only a
structured program design and the conversion worked
fine. This Java program has evolved with the 2D
simulation enhancements.
When you did testing the other day, did you use
appletviewer? I looked at it on your site using Safari and run it as application also.
Appletviewer will not detect the problem
so don't rely on Appletviewer to interpret the
problem. Oddly, I wish the program behaved the same
way as what happens when using appletviewer. In fact,
if I could change 2d reset button logic to terminate
and restart the entire applet again via html, then my
problem would be solved. But I don't know if this type
of applet restart is possible or how to effect the
code change if feasible. -
Delicate ProgressMonitor/ event handling problem
Hi,
I have a delicate ProgressMonitor / event handling problem.
There exists some solution on similiar problems here in the forums, but no solution to my special problem, hope anybody can help me out.
I have a rather big project, an applet, that I've written a separate JarLoader class that will load specific jar's if the ClassLoader encounter a unloaded class, all ok so far.
But, during loading, I would like to display a ProgressBar. And here is the problem. If my custom ClassLoader intercepts a findClass -request that needs to load the class from a jar from a normal thread, this is no problem, but if the ClassLoader intercepts a findClass that needs loading a jar when inside the EventQueue -thread, this is becomming tricky!
The catch is that an event posted on the EventQueue finally needs a class that needs to be loaded, but I cannot dispatch a thread to do this and end that particular event before the class itself is loaded.
So how do I hold the current EventQueue -event needing a jar -load, Pop up a ProgressBar, then process events in the EventQueue to display the ProgressBar and update repaints in it? then return from the event that now have loaded needed class-files.
I've tried a tip described earlier in the forums by trying to handle events with this code when loading the Jar:
/** process any waiting events - use during long operations
* to update UI */
static public void doEvents() {
// need to derive from EventQueue otherwise
// don't have access to protected method dispatchEvent()
class EvtQueue extends java.awt.EventQueue {
public void doEvents() {
Toolkit toolKit = Toolkit.getDefaultToolkit();
EventQueue evtQueue = toolKit.getSystemEventQueue();
// loop whilst there are events to process
while (evtQueue.peekEvent() != null) {
try {
// if there are then get the event
AWTEvent evt = evtQueue.getNextEvent();
// and dispatch it
super.dispatchEvent(evt);
catch (java.lang.InterruptedException e) {
// if we get an exception in getNextEvent()
// do nothing
// create an instance of our new class
EvtQueue evtQueue = new EvtQueue();
// and call the doEvents method to process the events.
evtQueue.doEvents();
}Then, the loader checks
java.awt.EventQueue.isDispatchThread()to see if its' inside the eventqueue, and runs doEvents after updating the ProgressMonitor with new setProgress and setNote values.
More precise;
The loader is loading the jar like this:
(this is pseudo code, not really usable, but outlines the vital parts)
public void load() {
monitor = new ProgressMonitor(null, "Loading " + jarName, ""+jarSize + " bytes", 0, jarSize);
monitor.setMillisToDecideToPopup(0);
monitor.setMillisToPopup(0);
// reading jar info code here ...
JarEntry zip = input.getNextJarEntry();
for (;zip != null;) {
// misc file handling here... total = current bytes read
monitor.setProgress(total);
monitor.setNote(note);
if (java.awt.EventQueue.isDispatchThread()) {
doEvents();
zip = input.getNextJarEntry();
monitor.close();
}When debugging doEvents(), there is never any events pending in peekEvents(), even if I tries to put a invokeLater() to run the setProgress on the monitor, why? If it had worked, the doEvents() code would have saved my day...
So, this is where I'm totally stuck...Just want to describe how I did this using spin from http://spin.sourceforge.net
This example is not pretty, but it can probably help others understanding spin. Cancelling the ProgressMonitor is not implemented, but can easily be done by checking on ProgressMonitor.isCanceled() in
the implementation code.
First, I create a bean for displaying and run a ProgressMonitor:
Spin requires an Interface and an Implementation, but that's just nice programming practice :-)
import java.util.*;
public interface ProgressMonitorBean {
public void start(); // start spinning
public void cancel(); // cancel
public int getProgress(); // get the current progress value
public void setProgress(int progress); // set progress value
public void addObserver(Observer observer); // observer on the progressValue
}Then, I created the implementation:
import java.util.*;
import javax.swing.ProgressMonitor;
import java.awt.*;
public class ProgressMonitorBeanImpl extends Observable implements ProgressMonitorBean {
private ProgressMonitor monitor;
private boolean cancelled;
private int progress = 0;
private int currentprogress = 0;
public ProgressMonitorBeanImpl(Component parent, Object message, String note, int min, int max) {
monitor = new ProgressMonitor(parent, message, note, min, max);
monitor.setMillisToDecideToPopup(0);
monitor.setMillisToPopup(0);
public void cancel() {
monitor.close();
public void start() {
cancelled = false;
progress = 0;
currentprogress = 0;
while (progress < m_cMonitor.getMaximum()) {
try {
synchronized (this) {
wait(50); // Spinning with 50 ms delay
if (progress != currentprogress) { // change only when different from previous value
setChanged();
notifyObservers(new Integer(progress));
monitor.setProgress(progress);
currentprogress = progress;
} catch (InterruptedException ex) {
// ignore
if (cancelled) {
break;
public int getProgress() {
return progress;
public void setProgress(int progress) {
this.progress = progress;
}in my class/jarloader code, something like this is done:
public void load() {
ProgressMonitorBean monitor = (ProgressMonitorBean)Spin.off(new ProgressMonitorBeanImpl(null, "Loading " + url,"", 0, jarSize));
Thread t = new Thread() {
public void run() {
JarEntry zip = input.getNextJarEntry();
for (;zip != null;) {
// misc file handling here... progress = current bytes read
monitor.setProgress(progress);
t.start(); // fire off loadin into own thread to do time consuming work
monitor.start(); // this will spin events on monitor and block until progress = max
monitor.cancel(); // Just make sure ProgressMonitor is closed
}The beautiful thing here is that Spin is taking care of weither the load() is inside the dispatch thread or not, making the code much simpler and cleaner to understand.
The ProgressMonitorBeanImplementation could been made much nicer and more complete, but I was in a hurry to check if it worked out. And it did! This will be applied on a lot of gui -components that blocks the event-queue in our project, making it much more responsive.
Hope this will help others in similiar situations! Thanks again svenmeier for pointing me to the spin -project. -
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 -
Javascript embedded in button pl/sql event handler not being executed
Javascript calls not working from pl/sql button event handler. What am I missing? Are specific settings needed to execute javascript from pl/sql proceedures?
Example: Want to toggle target='_blank' off and on in a button pl/sql event handler to open url call in new window & then reset when processing submit is done & the app returns to the form.
portal form button's pl/sql submit handler:
begin
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
end ;
Putting the following in the button's javascript on_click event handler works great:
this.form.target='_blank'
to force opening new window with a call in the button's submit pl/sql code via:
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
but then the target='_blank' is left on when the submit is done & we return to the form.
putting the above javascript as a function (called fcn_newpage) elsewhere (e.g., after form opens) & calling in the submit pl/sql with
htp.p('fcn_newpage') ;
also doesn't work.
Metalink thought this was an application issue instead of a bug, so thought I'd see if anyone knows what's going wrong here. (Portal 9.0.4.1)thanks for your discussion of my post.
Please clarify:
"htp.p('fcn_newwindow') sends a string":
What would you suggest the proper syntax for a function fcn_newwindow() call from a pl/sql javascript block that differs from
htp.p('<script language="Javascript">') ;
htp.p('fcn_newwindow');
htp.p('</script>');
or more simply
htp.p('fcn_newwindow') ;
More generally, what I'm trying to figure out is under what conditions javascript is executed, if ever, in the pl/sql of a button (either the submit or custom event handler, depending on the button).
I've seen lots of posts asking how to do a simple htp.p('alert("THIS IS TROUBLE")') ; in a pl/sql event handler for a button on a form, but no description of how this can be done successfully.
In addition to alerts, in my case, I'd like to call a javascript fcn from a pl/sql event handle that would pass a URL (e.g., http://www.oracle.com) where the javascript fcn executed
window.open(URL). The API call to set_target(URL) in pl/sql has no ability to open in a new window, so calling that is inadequate to my needs and I must resort to javascript.
Its clear in the PL/SQL of a button, you can effect form components since p_session..set_target & p_session.get_target set or get the contents of form components.
So to see if javascript ever works, I tried to focus on something simple that only had to set what amounts to an enviromental variable when we returned to the form after a post. I chose to try to change the html value of TARGET from javascript in the PL/SQL button because it doesn't need to be implemented until we finish the post and return to the form.
So I focused on a hack, setting this.form.TARGET='_blank' in the on_click event handler that forced every subsequent URL call or refresh of the form to be a new window. I then wanted to turn off opening new windows once I'd opened the URL call in a new window by setting TARGET='' in the portal form. I can achieve what I want by coding this.form.TARGET='' in the javascript (on_focus, on_change, or on_mousedown, ...) of every form component that might refresh the form. However, that is a ridiculous hack when a simple htp.p('<script>') ; htp.p('this.form.target=""') ; htp.p('</script>') ; at the end of the button's pl/sql event handle should do the same thing reliably if javascript ever works in the pl/sql event handler.
If we didn't have access to form components through p_session calls, I'd assume it was a scope issue (what is available from the pl/sql event handler). But unless my syntax is just off, when, if ever, can javascript be used in a portal form's pl/sql event handler for a button?
if I code a javascript funtion in the forms' pl/sql before displaying form:
htp.p('<script language="JavaScript">') ;
htp.p('function fcn_new_window(URL)') ;
htp.p('window.open(URL)' ) ;
htp.p('</script>') ;
the function can be called from a button's on_click javascript event handler:
fcn_new_window('http://www.oracle.com')
but from the same button's pl/sql submit event handler this call doesn't work: htp.p('fcn_new_window("http://www.oracle.com")')
So my questions remain: Is there other syntax I need, or does javascript ever work properly from the pl/sql of a form button's event handler? If it doesn't work, isn't this a bug that should be fixed by Oracle?
I can probably figure out hacks to make things work the way I need, but executing javascript from pl/sql event handlers seems to be the expected way to affect portal html pages (forms, reports, ...) and it seems not to work as expected. I don't feel I should have to implement hacks for something as simple as calling a javascript function from pl/sql when almost every example I've found in metalink or the forums or Oracle Press's "portal bible" suggests using javascript from pl/sql via the utility htp.p() to effect web page components in portal.
My TAR on the subject, while still open, returned the result basically: "We can reproduce your situation. Everything looks okay to us, but we can't explain how to use javascript where you want or point you to any documentation that would solve your problem or expain why it should not work the way you want it to. We don't feel its a technical issue. Why don't you post the problem on the portal applications forum."
I'm hoping I'm just missing something fundamental and everything will work if I implement it a little differently. So if anyone sees my error, please let me know.
by the way, not sure this is germain, but in reference to your comment:
"redirections in pl/sql procedures give a peculiar result. in a pl/sql procedure, usually, portals give the last redirection statement and ignore anything else coming after it."
if I try to raise an alert:
htp.p('alert("you screwed up")');
return;
in a pl/sql event handler, it still doesn't raise the alert, even though its the last thing implemented in the event handler. But if I set the value of a text box using p_session..set_value_as_string() at the same spot, it correctly sets the text box value when I return to the form. -
Event Handler/Create User Event bug
This is a problem I've run into a few times on my system (Win2k) so I finally went back and reproduced it step by step since it wasn't too hard. It causes LabVIEW to crash and exit without saving.
- Create an Event Handler
- Place 'Register Events', wire output to dynamic event terminal
- Place 'Create User Event', wire output to 'Register Events'/User Event
- Place an Empty String Constant [""], wire to input of 'Create User Event'
- Set empty string property -> Visible Items > Label = True
- Rename label from "Empty String Constant" to other such as "Event"
OR
- Create a cluster constant with something in it
OR
- Place a boolean constant
- Set boolean property -> Visible Items > Label = True
- Name label something su
ch as "Event"
- 'Add Event Case...' to the Event Handler, select Dynamic / : User Event
- Delete the constant wired to 'Create User Event'.
- Place a constant of a different data type and wire it to the input of 'Create User Event'
LabVIEW immediately disappears (all changes are lost) and this error is displayed:
================================
LabVIEW.exe has generated errors and will be closed by
Windows. You wlil need to restart the program.
An error log is being created.
================================
If there is a more appropriate place to post things of this nature that don’t really add to the discussion group, but need to be brought to the attention of NI, please post a URL or submittal method. Thanks...Thanks for the detailed request. We are aware of this exact issue, and the problem was actually fixed for LabVIEW 7.0 for Mac/Unix. Unfortunately, it did not get fixed for the initial release of LabVIEW 7.0 for Windows, but we have plans to include the fix in the first LabVIEW patch for 7.0.
Also, the Discussion Forum is great for notifications of this kind. For future reference, you also have the options of emailing NI engineers directly, or calling us with suspected bug fixes, if you would like more direct communication.
Thanks again, and have a great day!
Liz Fausak
Applications Engineer
National Instruments
www.ni.com/support -
The onDeactivate event handler doesn't work in InDesign CC. Why?
Hi guys.
I’m working on a script in Javascript for InDesign CC.
The big problem is that the onDeactivate event handler doesn’t work.
Here’s an example that works in InDesign CSx but not in InDesign CC:
#target indesign
var w = new Window ("dialog", "Test onDeactivate");
var et_1 = w.add("edittext", [undefined, undefined, 300, 30], "Lorem ipsum");
var et_2 = w.add("edittext", [undefined, undefined, 300, 30], "Dolor sit amet");
var st = w.add("statictext", [undefined, undefined, 300, 30], "CONSOLE:\r\r", {multiline: true});
et_1.onDeactivate = et_2.onDeactivate = function(){
st.text = "CONSOLE: I left the field with this text:\r\t«" + this.text +"»"; }
var b_ok = w.add("button", undefined, "OK");
w.show();
The script shows a dialog window with 2 edit text fields: when a field loses the focus (clicking on the other one), the «CONSOLE» shows the text of the old field.
Adobe, please, fix this issue as soon as possible.
Thanks.
GiorgioIt's a bug, and it has been reported. Please report it yourself, the more reports the better. It's no good asking Adobe in this forum to fix something.
Peter -
Setting Item level access rights on sharepoint list item in ItemAdding event handler
Hi ,
I am using sharepoint 2013. I am trying to set item level access rights when a list item is added using the following code snippet,
public override void ItemAdding(SPItemEventProperties properties)
base.ItemAdding(properties);
ConfigureItemSecurity(properties);
private void ConfigureItemSecurity(SPItemEventProperties properties)
var item=properties.ListItem;
SPSecurity.RunWithElevatedPrivileges(delegate()
using (SPSite site = new SPSite(properties.SiteId))
using (SPWeb oWeb = site.OpenWeb())
item.ParentList.BreakRoleInheritance(true);
oWeb.AllowUnsafeUpdates = true;
var guestRole = oWeb.RoleDefinitions.GetByType(SPRoleType.Reader);
var editRole = oWeb.RoleDefinitions.GetByType(SPRoleType.Editor);
SPGroup HRGroup = oWeb.SiteGroups.Cast<SPGroup>().AsQueryable().FirstOrDefault(g => g.LoginName=="HR Team");
SPRoleAssignment groupRoleAssignment = new SPRoleAssignment(HRGroup);
groupRoleAssignment.RoleDefinitionBindings.Add(guestRole);
SPUserCollection users = oWeb.Users;
SPFieldUserValueCollection hm = (SPFieldUserValueCollection)item["HiringManager"];
SPFieldUserValueCollection pm = (SPFieldUserValueCollection)item["ProjectManager"];
SPFieldUserValueCollection pmChiefs = (SPFieldUserValueCollection)item["ProjectManagerChief"];
item.BreakRoleInheritance(true);
item.RoleAssignments.Add(groupRoleAssignment);
foreach (SPFieldUserValue staffMember in hm)
SetRightsOnItem(item, staffMember, editRole);
foreach (SPFieldUserValue staffMember in pm)
SetRightsOnItem(item, staffMember, guestRole);
foreach (SPFieldUserValue staffMember in pmChiefs)
SetRightsOnItem(item, staffMember, guestRole);
item.Update();
private void SetRightsOnItem(SPListItem item, SPFieldUserValue staffMember, SPRoleDefinition role)
SPUser employeeUser = staffMember.User;
var userRoleAssignment = new SPRoleAssignment(employeeUser);
userRoleAssignment.RoleDefinitionBindings.Add(role);
item.RoleAssignments.Add(userRoleAssignment);
Nothing is happening though... Is the event handler the right place to do this?
thank youHi ,
You can refer to the code working in my environment:
using System;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.Workflow;
namespace ItemLevelSecurity.ItemSecurity
/// <summary>
/// List Item Events
/// </summary>
public class ItemSecurity : SPItemEventReceiver
/// <summary>
/// An item was added.
/// </summary>
public override void ItemAdded(SPItemEventProperties properties)
SPSecurity.RunWithElevatedPrivileges(delegate()
try
using (SPSite oSPSite = new SPSite(properties.SiteId))
using (SPWeb oSPWeb = oSPSite.OpenWeb(properties.RelativeWebUrl))
//get the list item that was created
SPListItem item = oSPWeb.Lists[properties.ListId].GetItemById(properties.ListItem.ID);
//get the author user who created the item
SPFieldUserValue valAuthor = new SPFieldUserValue(properties.Web, item["Created By"].ToString());
SPUser oAuthor = valAuthor.User;
//assign read permission to item author
AssignPermissionsToItem(item,oAuthor,SPRoleType.Reader);
//update the item
item.Update();
base.ItemAdded(properties);
catch (Exception ex)
properties.ErrorMessage = ex.Message; properties.Status = SPEventReceiverStatus.CancelWithError;
properties.Cancel = true;
public static void AssignPermissionsToItem(SPListItem item, SPPrincipal obj, SPRoleType roleType)
if (!item.HasUniqueRoleAssignments)
item.BreakRoleInheritance(false, true);
SPRoleAssignment roleAssignment = new SPRoleAssignment(obj);
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
item.RoleAssignments.Add(roleAssignment);
Thanks,
Eric
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected].
Eric Tao
TechNet Community Support -
Hi There,
We have a use-case where we need intercept the event of af:inputComboboxListOfValues component.
I have table, which has three columns, Name, Description and Label.
I have a LOV on Name column.
When user change the value of Name column by selecting an value from dropdown, I need to do business validation, I show user the "Yes/No" popup with warning message, and base on the user's choice, either proceed with the change or stop the change.
My problem is that I am unable to find a appropriate event to show the popup.
I know there are several events in the af:inputComboboxListOfValues component, launchPopupEvent, returnPopupEvent and valueChangeEvent.
1. If I show popup on launchPopupEvent, after the user click "Yes/No" button on the popup, the page will be refreshed and dropdwon doesn't show the item list.
2. returnPopupEvent and valueChangeEvent event will be handled by framework in one request, there is no chance for user's interaction.
I am not familiar with ADF event handling machenism, can anyone help me?
Thanks in advance.
Thunder
Edited by: 984466 on 2013-3-7 下午4:59
Edited by: 984466 on 2013-3-8 上午12:51Hi,
first of all, never post questions regarding internal JDeveloper builds (11.1.1.7 is not released to public) on this public forum. You are from Oracle and therefore have internal channels for this (note that using internal builds the problem could be with the build and not necessarily the code alone).
To your question:
I don't understand why
+"2. returnPopupEvent and valueChangeEvent event will be handled by framework in one request, there is no chance for user's interaction."+
doesn't work. If you set the "name" column component to autosubmit="true" then the listener fires as soon as you move out of the field and you can raise the alert. The current row in the binding points to the row you changed the name for and as such the value can be unset (the value change listener shows you the before and after value)
Frank -
Event Handling in Fullscreen Exclusive Mode???????
WIndows XP SP2
ATI 8500 All-In-Wonder
JDK 1.6
800x600 32dpi 200 refresh
1-6 buffer strategy.
the graphic rendering thread DOESN'T sleep.
Here's my problem. I have a bad trade off. In fullscreen exclusive mode my animation runs <30 fps and jerks when rendering. i.e. stop and go movement (not flickering/jittering just hesitant motion) when the animation is running. I solved this problem by raising the thread priority of the rendering (7-8). . . this resulted in latency/no activity for my input events both key and mouse. For instance closing the program alt-f4 will arbitrarily fail or be successful when the thread priority is raised above 6.
How does one accomplish a >30 fps and Instant event handling simultaneously in Fullscreen Exclusive Mode?
Is there a way to raise thread priority for event handling?
Ultimately I want to be able to perform my animations and handle key and mouse input events without having a visible 'hiccups' on the screen.
Much Appreciated!If I remember correctly the processor is a 1.4(or)6ghz AMD Duron
Total = 1048048kb
Available = 106084kb
Sys Cache = 211788kb
PF Usage = 1.01 GB
I solved some of the problem after posting this thread. . . .
I inserted a thread.sleep(1) and my alt-f4 operation worked unhindered with the elevated thread priority.
I haven't tested it with mouse event or any other key event but at the moment it looks I may have solved the problem.
If so, my next question will be is there a way to reduce the amount of cpu power needed to run the program.
I'm afraid that the other classes that I'm adding will actually become even more process consuming than the actually rendering thread.
public class RenderScreen extends Thread
// Screen Rendering status code
protected final static int RUNNING = 0,
PAUSED = -1;
// frames per second and process time counters
protected long now = 0, fps = 0, fpsCount = 0, cycTime = 0;
// thread status
protected int status = 0;
protected Screen screen;
public void setStatus(int i){ status = i; };
public void setTarget(Screen screen){ this.screen=screen; };
public void run()
setName("Screen Render");
screen.createBufferStrategy(1);
screen.strategy = screen.getBufferStrategy();
for(;;)
if(status == RUNNING)
now = System.currentTimeMillis();
while(System.currentTimeMillis() <= now+1000)
// call system processes
// fps increment / repaint interface
fpsCount++;
screen.renderView();
try { Thread.sleep(1);}catch(InterruptedException ie){ ie.printStackTrace(); }
fps = fpsCount;
cycTime = System.currentTimeMillis() - (now + 1000);
fpsCount=0;
public RenderScreen(){};
public RenderScreen(Screen screen){ this.screen=screen; };
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public class Screen extends Window
BufferedImage image = new BufferedImage(800,600,BufferedImage.TYPE_INT_RGB);
Graphics2D gdd = image.createGraphics();
MediaTracker tracker = new MediaTracker(this);
Image bground = getToolkit().getImage("MajorityRule.jpg"),
bawl = getToolkit().getImage("bawl.gif");
RenderScreen rScreen = new RenderScreen(this);
BufferStrategy strategy;
Graphics g;
Rectangle rect = new Rectangle(400,0,150,150);
//Game game = new Game();
public void renderView()
g = strategy.getDrawGraphics();
//--------- Game Procedures [start]
gdd.drawImage(bground,0,0,this);
gdd.drawString("fps: ["+rScreen.fps+"] Cycle Time: ["+rScreen.cycTime+"]",0,10);
//--------- Game Procedures [end]
//---------test
gdd.drawImage(bawl,rect.x,rect.y,rect.width,rect.height,this);
rect.translate(0,1);
g.drawImage(image,0,0,this);
//g.dispose();
strategy.show();
public Screen(JFrame frame)
super(frame);
try
tracker.addImage(bground,0);
tracker.addImage(bawl,1);
tracker.waitForAll();
catch(InterruptedException ie){ ie.printStackTrace(); }
setBackground(Color.black);
setForeground(Color.white);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MajorityRule extends JFrame
// Graphic System Handlers
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gd.getDefaultConfiguration();
Screen screen = new Screen(this);
Paper paper = new Paper();
public void windowed()
paper.setSize(getWidth(),getHeight());
getContentPane().add(paper);
setResizable(false);
setVisible(true);
public void fullscreen()
DisplayMode dMode = new DisplayMode(800,600,32,200);
screen.setBounds(0,0,800,600);
if (gd.isFullScreenSupported()) gd.setFullScreenWindow(screen);
if (gd.isDisplayChangeSupported()){ gd.setDisplayMode(dMode); };
screen.setIgnoreRepaint(true);
screen.setVisible(true);
screen.rScreen.setPriority(Thread.MAX_PRIORITY);
screen.rScreen.start();
screen.requestFocus();
public MajorityRule(String args[])
setTitle("Majority Rule [Testing Block]");
setBounds(0,0,410,360);
setDefaultCloseOperation(EXIT_ON_CLOSE);
getContentPane().setLayout(null);
if (args.length > 0 && args[0].equals("-window")) windowed();
else fullscreen();
public static void main(String args[])
new MajorityRule(args);
}; -
Event handler of inbound plug not called when plug fired by event handler
Hello All,
I have a rather bizzare problem, hopefully someone out there can figure out what is going on, as I'm rather stumped.
I have 2 views, A and B. They are linked by plugs, InA, InB, OutToA, OutToB. OutToB is linked to InB from A to B, OutToA is linked to InA from B to A.
There is an onActionLink in view A. Clicking on this triggers an action which calls the wdFirePlugOutToB method.
In view B some handling is done in the method onPlugInB, then wdFirePlugOutToA is called to change the displayed view back to A.
As far as the user is concerned they don't ever see view B. (this bit works perfectly!)
Now also in view A I have an event handler which handles a event from the component controller. It also calls wdFirePlugOutToB.
If I trigger an event in the component controller this event handler is called and the method called. However, when I put a breakpoint in the onPlugInB, flow never reaches here. Flow does get to the wdDoModifyView of view B but never to the inbound plug event handler.
Any suggestions as to what I might need to do? I would have thought calling the wdFirePlugOutToB method would ALWAYS trigger the linked event handler onPlugInB.
I am running NW04 SP18.
Thanks!Hi Bharathwaj,
The project I'm working on has a requirement to allow for a road-mapped process (FPM) which has one step in which multiple screens can be accessed. I'll give an example: A user in step A selects the cost centre that they want to work with, in step B they need to maintain several pages of information about this cost centre. The do not want to break this information into steps, as there is no logical progression from one step to the next, and it may well be that the user wishes to go from maintaining screen 1 to screen 3, and then screen 2, and then screen 4. Stepping between all screens (1->2->3->2->3->4) wastes time and is not very user friendly. Step C of the process confirms the data that the user entered in step B, and Step D is the validation that the changes have been committed to the database. (a very familar 4 step process for those using ESS).
To allow for this requirement, I have designed a left navigation pane type screen. links appear on the left of the screen and the user can use these to navigate between different screens (implemented as FPM IVAC VCs) on the right of the screen.
It is quite an elegant solution (even if I do say so myself although quite complex to implement. I have relied very heavily on reading the code SAP put together for the FPM. The most complex part is that in order to update the the content of view containers in an application you must trigger a web dynpro view navigation by firing a plug to a different view.
Unfortunately I don't have any sample application code, only the finished product, which I can't really share. But I can say that if you look at the FPM code carefully, working from where the wdInit of the FPM is called, it will eventually make sense.
One thing I found slightly frustrating, you can't use the FPM's component usage register (FPM method attachComponentUsage(IWDComponent, IWDComponentUsage)) to add a VC... darned inconvienient really (you'd think that the web dynpro framework could have implemented the concept of extending an interface, but the IBLC and IVAC interfaces are different! - even though the IVAC is just IBLC + a few methods), but then again you can manage the instantiation of the used VC yourself and call the onInit method of the VC passing the current fpm reference, to attach it to a common FC, and given that you should be sharing context through the FC and never the VC, then really this isn't too much of an issue. (I spent ages worrying that I couldn't add the instances of the VC that I was using within my navigation pane VC to the fpm instance list, until I realised that it really didn't matter!)
One day - when I have time (yeah right!) I might put together a blog about this sort of stuff, in the meantime, it keeps me plenty busy enough not to have the time!
Hope this helped in some small way,
Cheers,
Chris -
Event handler elements inside of the array
I have an array of clusters, of which inside the cluster are buttons. I want to be able to tie an event handler to these buttons ( they would all handle the event the same, the only difference would be the index they were handling)
A while back a similiar problem was posted here:
http://forums.ni.com/t5/LabVIEW/Array-of-Clusters-with-Graph-Y-Scale-Change-Event/td-p/1194181/page/...
However, this solution did not appear to be able to deliver the index of which button in the array was pressed .. this is critical for my application. The button is basically an "edit' buttonw which allows the user to edit the elements of the cluster through a popup. Obviously I need to know which cluster the user intends to edit.nathand wrote:
One option: when the code starts, build an array of references to the edit buttons inside each cluster. Then, in the event case, search that array for the reference that triggered the event. The index at which the reference is found tells you which cluster to edit.
This might work, but it should be possible for the user to add/delete elements from the array so I would need to be able to do this even after program initialization.
Currently, I have just made dozen buttons alongside the array of clusters. But this workaround won't allow past a fixed number at program initialization. -
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 -
Event handler eats up memory. Bad programing and/or bug.
Hello
I've been programming a GUI for a project. The basics of the program is a sample routine that updates a array once a second. Once the array is updated I use a event handler to plot the new array in a graph.
When I wrote this gui I think I've stumbled upon a bug in Labviews memory allocation.
If you have two loops. One that builds a array and then signals a loop with a eventhandler that reads the array and the event handler is stoped for a few seconds (by opening a sub vi or something inside the event handler), the memory goes berserk. When the event handler is free after the stop the memory is still allocated and does not return.
I could not find any information on this problem in the forum so I thought I would share this information with everyone. I managed to reproduce this phenomena in a small example (attached), if anyone is interested in it. The problem is simple to fix once you recognize the problem. However it was not the simplest problem to find (imho that is ).
Regards
Andreas Beckman
Attachments:
bug.zip 23 KBWhere are you seeing the memory being allocated? What tool are you using, task manager or LabVIEW profiling? I'm not seeing what you describe (LV 7.1.1 on a 3.4 GHz Pentium 4 w/ 1 Gb memory)
Thanks,
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion -
Button Event Handler in a JList, Please help.
Hi everyone,
I have created a small Java application which has a JList. The JList uses a custom cell renderer I named SmartCellRenderer. The SmartCellRenderer extends JPanel and implements the ListCellRenderer. I have added two buttons on the right side inside the JPanel of the SmartCellRenderer, since I want to buttons for each list item, and I have added mouse/action listeners for both buttons. However, they don't respond. It seems that the JList property overcomes the buttons underneath it. So the buttons never really get clicked because before that happens the JList item is being selected beforehand. I've tried everything. I've put listeners in the Main class, called Editor, which has the JList and also have listeners in the SmartCellRenderer itself and none of them get invoked.
I also tried a manual solution. Every time the event handler for the JList was invoked (this is the handler for the JList itself and not the buttons), I sent the mouse event object to the SmartCellRenderer to manually check if the point the click happened was on one of the buttons in order to handle it.
I used:
// Inside SmartCellRenderer.java
// e is the mouse event object being passed from the Editor whenever
// a JList item is selected or clicked on
Component comp = this.getComponent (e.getX(), e.getY())
if(!(comp instanceof JButton)) {
System.out.println("Recoqnized Event, but not a button click...");
//return;
} else {
System.out.println("Recognized Event, IT IS A MOUSE CLICK, PROCESSING...");
System.out.println("VALUE: "+comp.toString());
What I realized is that not only this still doesn't work (it never realizes the component as a JButton) it also throws an exception for the last line saying comp is null. Meaning with the passed x,y position the getComponent() returns a null which happens when the coordinates passed to it are outside the range of the Panel. Which is a whole other problem?
I have yet to find an example on the web, using Google, that demonstrated using buttons inside a JList.
Can anyone help me with this. Thanks.A renderer is not a component, so you can't click on it. A renderer is just used to paint a representation of a component at a certain position in your JList.
I have yet to find an example on the web, using Google, that demonstrated using buttons inside a JList.Thats probably because this is not a common design. The following two designs are more common:
a) Create a separate panel for your JButtons. Then when you click on the button it would act on each selected row in the JList
b) Or maybe like windows explorer. Select the items in the list and then use a JPopupMenu to perform the desired functionality.
I've never tried to add a clickable button to a panel, but this [url http://forum.java.sun.com/thread.jspa?threadID=573721]posting shows one way to add a clickable JButton as a column in a JTable. You might be able to use some of the concepts to add 2 button to the JPanel or maybe you could use a JTable with 3 columns, one for your data and the last two for your buttons.
Maybe you are looking for
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