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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