I have some code I am writing which displays the contents of a directory associated with a category whenever a new category is clicked on in a different list view. For convenience, I wanted to supply a filter option that would only display those contents of the directory that matched a given string input.
I have all of this working properly, but there's a bug whenever I apply a filter to one category, and then switch to another. The filter is properly applied to the category I'm presently viewing. But when I try to click on another category, every file list for every category shows up empty. This bug only occurs when I apply a filter, it does not occur when I switch between categories without ever using a filter.
I thought, "that's fine, I'll just nuke the filter between each category change." So I tried:
if (filemodel->nameFilters().size() > 0)
{
// create an empty list of strings to pass to the filter.
QListString clearFilter;
filemodel->setNameFilters(clearFilter);
fileView->setModel(filemodel);
}
Sadly, that made no change in the behavior. I even tried appending an empty string to the list. No change. Ultimately, I had to resort to the following code:
if (filemodel->nameFilters().size() > 0)
{
// throw away the old filemodel and start over with a fresh one.
delete filemodel;
filemodel = new QFileSystemModel;
filemodel->setFilter(QDir::Files);
filemodel->setRootPath("/");
fileView->setModel(filemodel);
}
That worked, but this seems horribly wrong. It doesn't seem like I should have to throw away the filemodel and start with a new one from scratch. Is there a better solution to this problem?
For the sake of reference, here is all the code relevant to how I set things up in the MainWindow constructor, and how I implemented the method to do the filtering:
MainWindow::MainWindow(...)
{
// ... skipping a bunch of stuff
fileView = new QListView(this);
filemodel = new QFileSystemModel;
filemodel->setFilter(QDir::Files);
filemodel->setRootPath("/");
fileView->setModel(filemodel);
filterText = new QLineEdit(this);
doFilter = new QPushButton(this);
doFilter->setText("Filter Filenames");
connect(doFilter, SIGNAL(clicked(bool)), this, SLOT(filterFileView()));
// ... skipping a bunch of other stuff
}
void MainWindow::filterFileView()
{
QStringList filterToApply;
filterToApply.append("*" + filterText->text() + "*");
filemodel->setNameFilters(filterToApply);
filemodel->setNameFilterDisables(false);
fileView->setModel(filemodel);
}
