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 QProxyModeland 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;
};

#include <QtGui/QSortFilterProxyModel>

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

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

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MySortFilterProxyModel.cpp

#include "MySortFilterProxyModel.h"
 
#include <iostream>
 
MySortFilterProxyModel::MySortFilterProxyModel(QObject *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);
}

#include "MySortFilterProxyModel.h"

#include <iostream>

MySortFilterProxyModel::MySortFilterProxyModel(QObject *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);
}

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MainWindow.cpp
...

QDirModel *dirModel = new QDirModel();
MySortFilterProxyModel *proxyModel = new MySortFilterProxyModel();
 
proxyModel->setSourceModel(dirModel); // SEGFAULTS

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

proxyModel->setSourceModel(dirModel); // SEGFAULTS

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...

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...