Inconsistent behavior of focusLost with JTable and JTree

Swing has known problems for a long time with the cells and the loss of the thematic demonstrations in the JTables. Generally, users expect loss of focus to commit their changes rather than cancel the change. Then edit controls (for example, JTextFields) located in CellEditors should generally be listeners of update and manage focusLost() by calling cellEditor.stopCellEditing (). It is very clear.

JTables to have an additional, special problem associated with a generation (or not) of focus events when moving from one cell to another cell in the same table. To do this, the code that creates the JTable needs to call table.putClientProperty ("terminateEditOnFocusLost", Boolean.TRUE). Setting this property to 'magic' on the table allows expected behaviors Assembly when moving from cell to cell.

These issues are well described here: http://tips4java.wordpress.com/2008/12/12/table-stop-editing/

I've set up the property of the client and the listener to focus, and they perform as expected in most cases. But I seems to have discovered a third case that is not managed by one of these two known workarounds.

We have a design of the user interface master/detail where the master is a tree control and retail is the JTable of editable cells. The (master) JTree and JTable (detail) are each cashed in the JPanels which are in turn greeted in an enclosing JPanel.

If I am editing within a cell and click completely outside this hierarchy - for example, in the menus of the main application bar - the focusLost() is managed and the change is committed, as you wish. And if I click anywhere in the JTable, also commits the change.

But if I'm editing a cell and choose the JTree specifically, the change is aborted.

I added logging for focusLost() Manager. I found that in the majority of cases, for example when clicking on menus or other completely different control bar, table.isEditing () returns TRUE for the JTable both focusLost() Manager is running. Because the change is running, the Manager is capable of broadcasting of stopCellEditing() and validate the user change.

But when I click on the outside for the JTree specifically, then in focusLost() Manager I find isEditing() is WRONG - that is, the change has already been cancelled and there is no way to recover already cancelled user input. The text field focusLost Manager pointed out that 'the opposite element' (wins the focus) is a JTree control as expected.

So it seems that something either the JTree or the locking hierarchy Panel made a subtle change to the behavior of the focusLost(). And therefore bypasses of modification of standard tables do not fully work in our application. And unfortunately, clicking on cells change directly in the tree turns out to be a common case in our design of the user interface. Failing to validate the edition in this case with bad consequences that should be fixed.

Any suggestion would be appreciated. Note: the question is similar to related to this issue:

JTree does not call focusLost on headphone

but the tail wire. I concede that I'm not provide code either and he can't promise right now.
- - -
Jeff

Rainmaker says:
Right now seems to be a lot to a precise definition of the terms so I ask this question with regard to the docs.

good start :-)

>

You wrote:

invokesStopCellEditing and terminateEditOnFocusLost set up different behaviors, without overlap.

Yes, I did, it meant and still means he

>

The setInvokesStopCellEditing() docs say:

+ Determines what happens when the edition is interrupted by selecting another node in the tree, a change of data of the tree, or by other means. Setting this property a value of true causes changes to be automatically saved when editing is stopped. +

Well, your fat is your old problem: assumptions yet ;-) My focus is

+ Determines what happens when the change is interrupted by selecting another node in the tree, a change of data of the tree, or by some other means.

And which is supported by reading on:


     * @param newValue true means that stopCellEditing is invoked
     *        when editing is interrupted, and data is saved; false means that
     *        cancelCellEditing is invoked, and changes are lost

in the total sense: he's interrupted (whatever that means, no conclusive specification except this model or the selection change), this propterty determines whether editing is stopped or cancelled. Conversely: if it is not interrupted, the property has no effect.

Do you mean that the part of the sentence by other means does not include loses focus? I have to disagree. Of course loses focus is a "way" to interrupt the editing.

Nothing to accept or not: is done, it's the 'interrupt' that matters. Obviously (although without doubt) lose focus don't consider an interruption - nothing happens when moving the cursor somewhere else, neither commit nor cancel.

So if invokesStopCellEditing is defined, and the tree loses focus, it should save your work. And that's why the invokesStopCellEditing overlap with terminateEditOnFocusLost.

just to drive home ;-) - the item no.

>

Note that I stick to the definition in the docs.

No, you interpret the doc to fit your expectations.

I did an example code and checked the validation works when the tree loses focus.

You should have (it's a two-liner to add to your example) - see the divergence of expectations and reality, rethink your accession ;-)

In which case it's bugged, because the docs say it should.

In fact, I don't think it is (as you may have guessed so read up to here ) the text doc of course is not as easy as it could be, as is unfortunately a habit running in the swing. Assuming that means it that you wait that means is a trap. My general advice is to read the documentation of the api carefully and until its end and then check against the actual behavior expectations. The advice to take it or leave it - your choice, of course.

CU
Jeanette

Tags: Java

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    < p > understanding of this relationship, the NBCS scientists decided to study the use of the resources of coyotes on two islands of Narragansett Bay, Rhode Island. We used GPS to find out location necklaces where coyotes are spending their time. We have made the assumption that if we could identify food resources important coyote - control - coyotes defray their own numbers. NBCS called & quot; management passive coyote. & quot; < /p >

    < p > since 2005 when we are caught in the trap and to collar our first coyotes on the island that we found continuously as the most important food resources of our study are provided people. This means that they are in our command this means that we can control the coyotes. If we remove anthropogenic resources (human grants) coyote numbers will drop to the sustainable level of natural resources. When the coyotes are fed only natural prey number of coyotes (mice, woodchucks, rabbits, geese and deer) will be lower and they will provide useful pest services. < /p >

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