Plugin fails to display modal dialog with ActiveX'ed bean
I have first posted this in the ActiveX bridge group, and have gotten no response. Since the plugin group also has posts on modal dialogs, thought this is also correct to post here. Both plugin and ActiveX'ed beans use beans.ocx for display.
I have a bean wrapped as ActiveX with sun.beans.ole.Packager. The bean provides a method, which ultimately will pop up a modal confirm dialog (JOptionPane.showConfirmDialog(.)).
If the method is triggered solely from within the bean, say via a click on a bean's button, all is well.
If the method is triggered from its host (VB form), the
- the call is done on the main thread. The confirm dialog shows, but when I click on one of its buttons, the app hangs.
- If I try to pass the call into the event dispatch thread (SwingUtilities.invokeAndWait(.)), the confirm dialog somewhat pops up, but does not paint completely and the app hangs.
- If I try to pass the call into the event dispatch thread with SwingUtilities.invokeLater(.) all is well, the confirm dialog pops up, I can click on its buttons, etc. but the function returns to VB too early, which is not what I want since I need the answer.
- I have tried the following:
entry method determines it is not on the event dispatch thread.
Tries itself with invokeLater(.), yields the current thread and calls wait(.).
The method invoked later will execute in the event dispatch thread, popup the confirm dialog and when finished will do a notifyAll(.).
Unfortunately, what happens is that the entry thread (the main thread) puts the invokeLater into the event dispatch queue, yields itself and wait()'s. And waits and waits. In the meantime, the dispatch thread will get to the point where it wants to show the confirm dialog, but will then hang. If I time out the wait in the main thread, then the confirm dialog is popped up immediately after the wait finishes with the time-out.
Sooo, this tells me that there is some strange synchronization going on which causes something like a deadlock. Is there any good approach to triggering modal dialogs from a native app hosting the ActiveX'ed bean??
I have found many entries on probs with modal dialogs in the plug-in, which relate to applets. But no solution yet.
Some keywords that I have came across are:
- the event dispatch queue can be flushed and "empty events" can be posted into it. Also, the invokeAndWait(.) will register a "conditional" message pump on the event queue that seems to work until the locking condition is no longer valid. Any experience with these? Any way to manipulate (a) main thread, (b) event dispatch queue, (c) event dispatch thread to resolve the apparent deadlock?
- There seems to be some difference in locking when the parent process is VB/COM as when it is Java. I have the impression that the main thread has some lock until the call made from VB/COM is fully completed and the call stack cleaned up. Can anyone confirm this? And/or suggest a way around it?
Sylvia
Sylvia - I found your posting because I have a similar problem in which a JavaBean wrapped using the Packager needs to call a Visual Basic event subroutine from a thread other than the main thread.
This, I have discovered, is not supported in VB unless you use special thread marshalling calls (not available to the Java bean) or event queuing calls (ditto, afaik).
My point is that this may be related to your problem. Check this Microsnot document on their public support site:
Q196026
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I want to display a MFC Modal Dialog with a CListBox element, but I can't fill the listbox with data.
Here are some commands of my program:
SequenceContext seqContext;
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seqContext.AttachDispatch(seqContextDisp, FALSE);
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HWND parentHwnd = (HWND)engine.GetAppMainHwnd();
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The dialog with the emtpy listbox appears, b
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I hope you can help me to solve my problem.
Thank you.I've about the same problem and tried to implement your solution but can't get it to run. I always receive an assertion failure.
I try to fill the ComboBox in a dialog with items at runtime. (use VC++ and MFC-DLL)
the header of my dialog:
class DlgSelectECU : public CDialog
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//}}AFX_DATA
//{{AFX_VIRTUAL(DlgSelectECU)
protected:
virtual void DoDataExchange(CDataExchange*pDX);
//}}AFX_VIRTUAL
protected:
DECLARE_MESSAGE_MAP()
the implementation of my dialog:
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: CDialog(DlgSelec
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//{{AFX_DATA_INIT(DlgSelectECU)
//}}AFX_DATA_INIT
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while (pos)
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Hello everyone.
I try to make up a ModalDialog class with customized event dispatcher in order to wait an invoker.
But it fails :-(
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventDispatchChain;
import javafx.event.EventHandler;
import javafx.event.EventTarget;
import javafx.event.EventType;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.stage.Window;
import javafx.stage.WindowEvent;
import com.sun.javafx.stage.WindowEventDispatcher;
import java.util.ArrayList;
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ArrayList<Button> buttons;
int rc;
Stage stage;
Event event;
EventDispatchChain tail;
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initOwner( owner );
initStyle( StageStyle.UTILITY );
setTitle( title );
stage = this;
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Scene scene = new Scene(root);
setScene(scene);
root.setCenter( group );
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buttonPane.setSpacing(10);
for( int i=0 ; i<buttons.size() ; i++ ){
buttons.get(i).setOnAction( actionHandler );
buttonPane.getChildren().setAll( buttons );
root.setBottom( buttonPane );
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setX( screenX ); setY( screenY );
show();
MyWindowEventDispatcher dispatcher = new MyWindowEventDispatcher( stage );
setEventDispatcher( dispatcher );
while(true){
event = dispatcher.dispatchEvent( event, tail );
EventType<? extends Event> type = event.getEventType();
if( type==WindowEvent.WINDOW_HIDDEN ){
break;
return( rc );
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public void handle( ActionEvent e ){
EventTarget src = e.getTarget();
rc = buttons.indexOf( src );
stage.hide();
class MyWindowEventDispatcher extends WindowEventDispatcher {
public MyWindowEventDispatcher( Window window ){
super( window );
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ModalDialog.this.event = dispatchCapturingEvent( event );
ModalDialog.this.tail = tail;
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}A sample code to invoke ModalDialog
import java.util.ArrayList;
import javax.swing.JOptionPane;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
public class WindowEvent06 extends Application {
Stage mainStage;
public void start(Stage stage) throws Exception {
Group root = new Group();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("WindowEvent06");
mainStage = stage;
stage.setOnCloseRequest(new EventHandler<WindowEvent>() {
public void handle(WindowEvent e){
ModalDialog dialog = new ModalDialog( mainStage, "Question" );
Button yes = new Button( "Yes" );
Button no = new Button( "No" );
ArrayList<Button> buttons = new ArrayList<>();
buttons.add(yes); buttons.add(no);
Label msg = new Label( "Really Exit ?" );
Group groupInDialog = new Group();
groupInDialog.getChildren().add( msg );
dialog.setContents( groupInDialog, buttons );
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e.consume(); // this blocks window closing
stage.show();
public static void main(String[] args) {
launch(args);
}Hi,
The logic what you follows is some what in the right direction but need to have some changes.
What I would say is, first consume the windowClose event. Then open the dialog box and close the parent accordingly.
So after refactoring your code.
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class ModalDialog extends Stage {
Stage owner;
Stage stage;
BorderPane root;
public ModalDialog( Stage owner, String title){
root = new BorderPane();
stage = this;
this.owner = owner;
initModality( Modality.APPLICATION_MODAL );
initOwner( owner );
initStyle( StageStyle.UTILITY );
setTitle( title );
setContents();
public void setContents(){
Scene scene = new Scene(root,150,150);
setScene(scene);
Group groupInDialog = new Group();
groupInDialog.getChildren().add( new Label("Really Exit ?") );
root.setCenter( groupInDialog );
Button yes = new Button( "Yes" );
yes.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent paramT) {
stage.close(); // Closing the pop up.
owner.close(); // Closing the parent stage also.
Button no = new Button( "No" );
no.setOnAction(new EventHandler<ActionEvent>() {
@Override
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stage.close(); // Closing the pop up only
HBox buttonPane = new HBox();
buttonPane.setSpacing(10);
buttonPane.getChildren().addAll(yes,no);
root.setBottom(buttonPane);
stage.show();
}And the main class to check this implementation is
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
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public void start(final Stage stage) throws Exception {
Group root = new Group();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("WindowEvent06");
stage.setOnCloseRequest(new EventHandler<WindowEvent>() {
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e.consume(); // Consuming the event by default.
new ModalDialog( stage, "Question");
stage.show();
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launch(args);
}I hope the above code will give you some idea what i mean. :)
Happy Coding !!
Regards,
Sai Pradeep Dandem.
Edited by: Sai Pradeep Dandem on Jan 20, 2012 4:03 AM -
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<![CDATA[
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]]>
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I've tested this one and it works.
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]]>
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got the problem
i added the owner of the dialog - but in a different class ;)
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import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import java.net.*;
import javax.help.*;
import javax.swing.*;
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// get root frame of applet
Component component = this;
while (component.getParent() != null)
component = component.getParent();
Frame appletFrame = (Frame) component;
// create a modal dialog with the root frame as the parent
JDialog firstModalDialog = new JDialog(appletFrame);
firstModalDialog.setModal(true);
firstModalDialog.setSize(200, 200);
// create another modal dialog with the first dialog as the parent
final JDialog secondModalDialog = new JDialog(firstModalDialog);
secondModalDialog.setModal(true);
secondModalDialog.setSize(100, 100);
// add a listener to pop up the second modal dialog when we try to close the first
firstModalDialog.addWindowListener(
new WindowAdapter()
public void windowClosing(WindowEvent e)
secondModalDialog.show();
// make sure not to close the first dialog if the user clicks the X
firstModalDialog.setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
// show the first dialog
firstModalDialog.show();
}Good call dchsw, I tried 1.4.1_01 jre and it worked. If you run it with 1.3.0_01 jre you will see my problem. The problem for us is, we are stuck with 1.3.0_01 for our next release at least, due to Sun's decision to change event handling for java 1.4 jre and not make it backward compatible. I might have to hack my way around this one. Any other suggestions?
Thanks -
Maximize button in a modal dialog
Dear All,
I have requirement. I want to show a maximize button in a modal dialog which has the same maximizing functionality of a frame. I find the JDialog which is a secondary window and doesn't have API to add/remove buttons directly to the title bar as in JInternalFrame. I show a table in a popup modal dialog. But when the no of columns is more, the user might find difficult to traverse the table. Instead if the maximize button is there he can maximize the dialog to see all the columns in one shot. So, what all i need is a modal dialog with a maximize button in the title bar. This is quite urgent!. Thanks for any thoughts, ideas or code snippets.
wbr,
Srinivasan SamiveluHi Srinivasan,
Have you got any solution for this.
If so,please let me know.I am facing similar problem.
Thanks in advance
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