As far as I know WT is responsible for all of the memory management and it
should delete the old model.
Check the code to see if there is a smart pointer in there or a delete
statement.
2010/2/24 Hubbard, Charles W <[email protected]>
> Hello list,
>
> I am having some trouble with WTreeView widgets, and I am sure the problem
> is that I just don’t understand the proper way to do things. Here’s the
> story…
>
> We are trying to build a file selector dialog box to allow the user to
> select a file local to the server. To do this, we read the file and
> directory names out of the “current” directory path, and use those to
> populate a WStandardItem model. The WStandardItem model is attached to a
> WSortFilterProxyModel which is then attached to a WTreeView widget. That
> part all works fine. The files display properly in the WTreeView, the
> columns are sortable, the entries filter properly, and everything works just
> the way we want it to. The problem comes when a user double-clicks on a
> directory entry. At this point, we need to repopulate the model with the
> files and directories that live inside the directory just selected by the
> user.
>
> My only prior experience with WStandardItem models is in connection with
> WCartesianChart widgets. For my plotting applications, when it comes time
> to repopulate the model with different sets of plot data, I just call
> model->clear(), and add new rows, columns and series definitions as needed
> to contain the users newly selected data sets. That all works just fine,
> and I assumed the process for this WTreeView application would be similar.
> So, I assumed that when the time came to repopulate the model containing our
> file names with file names from a new directory, I could just call
> model->clear() on the WStandardItem model, and then add new rows and columns
> to the model to contain the new names. But that doesn’t work. Instead, as
> soon as I call model->clear() the program crashes with a seg fault. If
> instead, I instantiate a brand new WStandardItem model, populate it with the
> new file data, and then add that to the proxy model, that works fine. But I
> figure that’s probably not the way I’m supposed to be doing it. For one
> thing, that leaves the memory used by the previous WStandardItem model still
> allocated.
>
> So my question is, what is the correct way to clear out a model attached to
> a WTreeView (well, actually attached to a WSortFilterProxyModel that’s
> attached to a WTreeView) and repopulate it?
>
> I guess I should also mention I’m running this on Ubuntu 9.10 with some
> flavor of v3.0 Wt (it’s a development revision from the git repository
> pulled a few days after v3.0 was released to pick up some bug fixes), using
> the wthttpd connector.
>
> Any comments or suggestions will be most welcome.
>
>
> Charlie Hubbard
>
>
>
>
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