Thanks for investigating. I totally agree that this is worth looking into and
it's worth a bug report. ;) I would be great if you could put your findings
into a report for me. :)
Thanks,
Martin
Am 15.01.2013 um 15:17 schrieb Dietrich Streifert
<dietrich.streif...@googlemail.com>:
> Am 15.01.2013 11:56, schrieb Dietrich Streifert:
>>
>>
>>>
>>>> 3. Investigate why there are obviously so many
>>>> instatiations/destructions in this situation.
>>> This would also be a bug, together with bullet point 1. We need to
>>> find a solution for the problem you described and 1, is a solution
>>> which might help so solve point 3 but it is not certain that its the
>>> only valid and best way to fix it.
>>>
>> Yes i'm trying to find out where all those objects are generated.
>> There seemed to be a lot of destruct calls to qx.ui.basic.Label where
>> I have no idea where the instances are coming from.
>>
> Back from investigations ;-)
>
> The source of all this instantiations/destructions is the fact that
> setting the visibility of a single table column (my table has 11
> invisible columns) triggers a full recreation of all column header
> widgets each time the visibility of a column is changed via
> qx.ui.table.columnmodel.Basic.setColumnVisible.
>
> This in the end invokes method qx.ui.table.pane.Header._updateContent
> with parameter completeUpdate = true causing all header widgets to be
> destructed in method qx.ui.table.pane.Header._cleanUpCells.
>
> The event which causes the qx.ui.table.pane.Header._updateContent call
> is fired in qx.ui.table.pane.Model._onColVisibilityChanged:
>
> /**
> * Event handler. Called when the visibility of a column has changed.
> *
> * @param evt {Map} the event.
> */
> _onColVisibilityChanged : function(evt)
> {
> this.__columnCount = null;
>
> // TODO: Check whether the column is in this model (This is a
> little bit
> // tricky, because the column could _have been_ in this
> model, but is
> // not in it after the change)
> this.fireEvent(qx.ui.table.pane.Model.EVENT_TYPE_MODEL_CHANGED);
> },
>
> Despite of the problem of having 11 invisible rows the TODO mark
> indicates that this is something worth looking into.
>
>
> Regards
> Dietricht
>
>
>
>
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