QFileDialog and file sequences

[peterhillman]

OK - beginning to get there.

I subclassed QSortFilterProxyModel and reimplemented QSortFilterProxyModel::filterAcceptsRow to check for other files in the sequence.

Somehow QFileDialog::setProxyModel seems to have stopped selected files appearing in the File name LineEdit and I still haven't been able to change the filenames in the current directory view, but it's a start.

EDIT: Seems that even doing

QFileDialog::setProxyModel(new QSortFilterProxyModel() )

QFileDialog::setProxyModel(new QSortFilterProxyModel() )

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prevents files clicked on in the current directory view appearing as the selected file. Everything else seems to work. Any ideas?

[peterhillman]

Problem solved - more or less, but it isn't very clean.

• QT 4.3.2 fixes a bug with the FilterProxyModels which meant that selected files wouldn't appear in the line editor.
  
• Since files don't pass through QSortFilterProxyModel::filterAcceptsRow in any predictable order, a list of files seen in each sequence is required to ensure only the one 'standin file' is accepted for each sequence.
  
• The FileSystemModel doesn't support DisplayRoles (changing the text for the DisplayRole would be the neat way of getting the name of the sequence to display instead of the standin file) - a very ugly workaround was to create a displayDelegate and override displayText to draw the sequence name rather than the standin. Annoyingly, this approach means the sequence name can't be longer than the name of the standin.
  
• A queued signal connection from changedSelection is required to display (via selectFile) the sequence name rather than the standin file when it's clicked.

Not nice, not pretty, but it works.