QDirModel shared in two TreeViews with different TreeView configurations...

[killerwookie99]

I've been looking at examples and reading docs etc. I'd like run my thoughts by someone on how this would work, because I haven't run across this scenario anywhere.

Problem:

I would like to use a custom QDirModel for two TreeViews in one splitter pane, but I'd like to customize the look of one vs the other. currently doing via two QDirModels...:(
So on the left side I would like just folders and the name column (in TreeView form)
On the right I'd like the full up TreeView.

So would I implement this by using a QAbstractItemModel? If, yes how would this be accomplished? If no how can I use one custom QDirModel in two TreeViews with different layouts? What are your thoughts?

[wysota]

Hide all the columns but the first one in the tree. If you want to filter out files, use QSortFilterProxyModel and in its filterAcceptsRow() check if the index is a file or a directory and return false or true respectively. Then you'll be able to use one model for both views (one of them will additionaly be using a proxy model).

[killerwookie99]

What about QProxyModel? It says not to use it, is there something better?

[wysota]

Yes, you have a link to the docs in my previous post.

[killerwookie99]

Alright I'll stick with it, its use is just a little confusing for me.

[wysota]

What is confusing? The difference between QProxyModel and QAbstractProxyModel which is the base of QSortFilterProxyModel?

[killerwookie99]

When I try to do this it segfaults and I'm not sure if it's because I'm missing a function or what, but here's a simplistic version of what I tried to do...oh and it segfaults even when I comment out filterAcceptsRow...

MySortFilterProxyModel.h


#include <QtGui/QSortFilterProxyModel>

class MySortFilterProxyModel : public QSortFilterProxyModel
{
Q_OBJECT
public:
MySortFilterProxyModel(QObject *parent = 0);

protected:
bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
};


MySortFilterProxyModel.cpp


#include "MySortFilterProxyModel.h"

#include <iostream>

MySortFilterProxyModel::MySortFilterProxyModel(QOb ject *parent) : QSortFilterProxyModel(parent)
{

}

bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
{
QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);

std::cout << "Index: " << sourceModel()->data(index0).toString().toStdString() << std::endl;

return QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent);
}


MainWindow.cpp
...


QDirModel *dirModel = new QDirModel();
MySortFilterProxyModel *proxyModel = new MySortFilterProxyModel();

proxyModel->setSourceModel(dirModel); // SEGFAULTS

...

Any ideas?

[wysota]

What is the source model? Is it a custom model or a predefined one?

[killerwookie99]

It's using the regular qdirmodel from qt...

[wysota]

Could you print the backtrace from the debugger upon the segfault?

[killerwookie99]

You want a truss or something different, sorry my debugger knowledge is limited...