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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