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Bug 288357

Summary:

[Widgets] ComboBoxCellEditor throws SWTException if parent is disposed before it pops up

Product:

[Eclipse Project] Platform

Reporter:

Eleanor Joslin <ejj-eclipsebugs>

Component:

SWT

Assignee:

Platform-SWT-Inbox <platform-swt-inbox>

Status:

CLOSED WONTFIX

QA Contact:

Severity:

normal

Priority:

CC:

ipun, niraj.modi, pinnamur, Silenio_Quarti

Version:

4.8

Keywords:

helpwanted, triaged

Target Milestone:

---

Hardware:

OS:

All

Whiteboard:

stalebug

Attachments:

Description	Flags
Sample program	none

Description Eleanor Joslin

2009-09-02 09:43:16 EDT

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.0.9) Gecko/2009042115 Fedora/3.0.9-1.fc10 Firefox/3.0.9
Build Identifier: I20090611-1540

A dialog in my application contains an editable table with combo box cell editors whose contents are calculated on the fly.  Occasionally it takes a long time to find what the cell editor's options should be.  If the user closes the dialog while a call to ICellModifier.canModify(Object, String) is in progress, an SWTException (Widget is disposed) occurs when the cell editor is finally ready to appear.

Reproducible: Always

Steps to Reproduce:
1. Run the attached sample program.
2. Click on the "Open Dialog" button.
3. Click on the table cell labelled "Apples".  There is a 2-second delay before the cell editor activates.
4. Click OK before the 2 seconds are up.

org.eclipse.swt.SWTException: Failed to execute runnable (org.eclipse.swt.SWTException: Widget is disposed)
	at org.eclipse.swt.SWT.error(SWT.java:3884)
	at org.eclipse.swt.SWT.error(SWT.java:3799)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3468)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3115)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
	at org.eclipse.jface.window.Window.open(Window.java:801)
	at SlowOpeningComboBoxCellEditor.main(SlowOpeningComboBoxCellEditor.java:150)
Caused by: org.eclipse.swt.SWTException: Widget is disposed
	at org.eclipse.swt.SWT.error(SWT.java:3884)
	at org.eclipse.swt.SWT.error(SWT.java:3799)
	at org.eclipse.swt.SWT.error(SWT.java:3770)
	at org.eclipse.swt.widgets.Widget.error(Widget.java:450)
	at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:388)
	at org.eclipse.swt.custom.CCombo.setListVisible(CCombo.java:1475)
	at org.eclipse.jface.viewers.AbstractComboBoxCellEditor$1.run(AbstractComboBoxCellEditor.java:96)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	... 5 more



The DROP_DOWN_ON_MOUSE_ACTIVATION activation style must be set on the ComboBoxCellEditor for the bug to occur.

Comment 1 Eleanor Joslin

2009-09-02 09:44:11 EDT

Created attachment 146279 [details]
Sample program

Comment 2 Praveen

2010-02-11 10:46:58 EST

The problem is reproducible on most of the platforms and it seems the problem is more due to the attempt of using disposed widget in JFace code.

Comment 3 Ian Pun

2017-06-26 17:35:15 EDT

Bug is still reproducible and has been triaged. Visit https://wiki.eclipse.org/SWT/Devel/Triage for more information.

Comment 4 Niraj Modi

2018-05-08 03:06:33 EDT

Please re-target this bug as required.

Comment 5 Eclipse Genie

2020-06-17 11:41:22 EDT

This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. As such, we're closing this bug.

If you have further information on the current state of the bug, please add it and reopen this bug. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.

--
The automated Eclipse Genie.