Filter Columns in a QFileSystemModel
How to Filter Columns in a QFileSystemModel
Sometimes one does not want to display all the columns of a "QFileSystemModel":http://doc.qt.nokia.com/stable/qfilesystemmodel.html, like discussed in "this forum thread":http://developer.qt.nokia.com/forums/viewthread/3114/.
This can be achieved in two ways, either by hiding the columns in the view, by using a specialized proxy model. The easiest way is to hide the columns using the
QHeaderView
, but the alternative to subclass "QSortFilterProxyModel":http://doc.qt.nokia.com/stable/qsortfilterproxymodel.html and reimplement the
filterAcceptsColumn()
method also works well.
Column hiding using QHeaderView
All multi-column views provide access to a "QHeaderView":http://doc.qt.nokia.com/stable/qheaderview.html . This is the widget that provides the headers above the columns of data, and allows the user to resize those columns, or click the headers to trigger a sorting order. You can also use this widget to hide columns in your view.
//hide the third and fourth column, note that the column numbers are 0-based
QHeaderView* hHeader = m_theTableview->horizontalHeader();
hHeader->hideSection(2);
hHeader->hideSection(3);
The alternative method of using a custom proxy model is outlined below.
Column hiding using QSortFilterProxyModel
Be aware that the column count is 0-based and that it is hard coded.
==== fsmproxy.h
#include <QSortFilterProxyModel> ====
class FSMProxy : public QSortFilterProxyModel
{
Q_OBJECT
public:
FSMProxy(QObject *parent);
protected:
bool filterAcceptsColumn(int source_column, const QModelIndex &source_parent) const;
};
==== fsmproxy.cpp
FSMProxy::FSMProxy(QObject *parent)
: QSortFilterProxyModel(parent)
{
} ====
bool FSMProxy::filterAcceptsColumn(int source_column, const QModelIndex &source_parent) const
{
Q_UNUSED(source_parent)
// adjust the columns you want to filter out here
// return false for those that will be hidden
if(source_column 2 || source_column 3)
return false;
return true;
}
==== Usage
QFileSystemModel *fsm = new QFileSystemModel(this);
FSMProxy *proxy = new FSMProxy(this);
proxy->setSourceModel(fsm);
treeView->setModel(proxy);
====