AppletTalk.com

blue · Guest

Brief overview:

I have a JTree within an applet.
I have a MouseListener on the JTree to trap a right mouse click and display
a JPopupMenu
...public void mousePressed(MouseEvent e)
{
if (e.isMetaDown())
{
showPopupMenu( e );
return;
}
}

Problem:

We've encountered a problem (inconsistent), where a user will right click on
a "new" node on the tree, and the browser just hangs. The only way to close
the browser is with task manager (I'm running WinXP, IE 6, jdk 1.4.2_04).

The showPopupMenu method is called:
public void showPopupMenu(MouseEvent mouse_event)
{
try
{
// get root node from tree model
SpiderClientNode root_node =
(SpiderClientNode)tree_model.getRoot();
// get the path from the mouse event object (where the user
clicked)
TreePath mouse_click_path = getPathForLocation(mouse_event.getX(),
mouse_event.getY());
// if mouse click path is null, do nothing
if (mouse_click_path != null)
{
System.out.println("have mouse click path, now retrieving the
node at that path");
// get SpiderClientNode from path
SpiderClientNode mouse_click_node =
(SpiderClientNode)mouse_click_path.getLastPathComponent();
// if node is null, do nothing
if (mouse_click_node != null)
{
System.out.println("user clicked on node with product id: " +
mouse_click_node.getProductId());
// get currently selected path
TreePath selected_path = getSelectionPath();
// get selected node from path
SpiderClientNode selected_node =
(SpiderClientNode)selected_path.getLastPathComponent();
// if selected node is different than the mouse click node,
set new selection path
if (selected_node != null && selected_node !=
mouse_click_node)
{
System.out.println("selected node is different than the
mouse click node, setting new selection path");
// call method to set global variable for new path
setSelectionPath(mouse_click_path);
}
// if mouse click node is not the root, display the popup
menu
if (mouse_click_node != root_node)
{
System.out.println("mouse click node != root, showing
menu");
// instantiate popup menu
System.out.println("creating new popup menu");
SpiderTreeRTPopupMenu popup = new
SpiderTreeRTPopupMenu(parent_applet,mouse_click_node);
System.out.println("new menu created, display to user at
location X: " + mouse_event.getX() + " and Y: " + mouse_event.getY());
// show the menu at mouse click location
popup.show( mouse_event.getComponent(),
mouse_event.getX(), mouse_event.getY() );
System.out.println("menu should now be displayed");
}
}
else
{
System.out.println("user did not right click on a node in the
tree");
}
}
else
{
System.out.println("mouse click path is null");
}
}
catch (Exception e)
{
System.out.println("SpiderTreeRT::showPopupMenu(MouseEvent)::Unable
to show popup");
e.printStackTrace();
}
}

I get all System.out's up until the popup.show method is called, then the
browser hangs.

Has anyone encountered such a problem? Any input would be greatly
appreciated.

Thank you,
Frank

Andrew Thompson · Guest

On Fri, 14 Jan 2005 10:45:22 -0500, blue wrote:

blue · Guest

Sorry,

Intranet only....

Frank

"Andrew Thompson" <SeeMySites (AT) www (DOT) invalid> wrote

Andrew Thompson · Guest

On Wed, 19 Jan 2005 08:48:04 -0500, blue wrote:

blue · Guest

When dealing with customer data, yes, it becomes "secret". I've set up a
test product which you can access from:

http://elogia-salesdemos.net/cse35/cse

Login with config/config

Select "RACK" under "- Product Configuration" in the "Enterprise Tools"
section on the left.

Once the applet loads, you will see a configuration tree on the left hand
side. A right click on any node other than the root will (should) display
the popup menu with information about that node. Sometimes the menu will
show, other times, the browser will just lock up.

Thanks for you time. I've also tried changing my code so that no components
are instantiated in the listener events, this didn't help either.

Frank

"Andrew Thompson" <SeeMySites (AT) www (DOT) invalid> wrote

Andrew Thompson · Guest

On Thu, 20 Jan 2005 10:06:00 -0500, blue wrote:

Please refrain from top-posting Frank, I find it most confusing.
<http://www.physci.org/codes/javafaq.jsp#netiquette>

See further comments 'in-line with trimming'

blue · Guest

Just an FYI:

The problem turned out to be a conflict between showing the popup menu and
spawning an action thread on node selection. If I simply run the method
calls in the change listener without threading them, all is well.

Thank you for all of your input.
Frank

Andrew Thompson · Guest

On Fri, 28 Jan 2005 10:56:37 -0500, blue wrote: