Can't get Icons in vertical header with QSortFilterProxyModel

kewljohny

Hello,

I'm working on a program that reads in a text file and puts data into a QStandardItemModel attached to a QTableView. If a particular word appears in a line of text read from the file, the program will put an "X" icon in the vertical header for that particular row. I'm having a problem with this X appearing in a QSortFilterProxyModel.

Everything works fine in standard form. However, I'm implementing filtering capability on the tableview with a 2 QLineEdit input fields above the table. I connect the two lineEdits to a filterChanged() slot and I reimplemented QSortFilterProxyModel as follows:

mysortfilterproxymodel.h:
@
#ifndef MYSORTFILTERPROXYMODEL_H
#define MYSORTFILTERPROXYMODEL_H

#include <QSortFilterProxyModel>

class MySortFilterProxyModel : public QSortFilterProxyModel
{
Q_OBJECT
public:
explicit MySortFilterProxyModel(QObject *parent = 0);
QVariant headerData(int section, Qt::Orientation orientation, int role=Qt::DisplayRole) const;

protected:
bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
};
#endif // MYSORTFILTERPROXYMODEL_H
@
mysortfilterproxymodel.cpp:
@
#include "mysortfilterproxymodel.h"
#include <QIcon>

MySortFilterProxyModel::MtSortFilterProxyModel(QObject *parent) :
QSortFilterProxyModel(parent)
{
}
bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
{
QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);
QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent);
//filtering on 2 columns

QString filt1 = filterRegExp().pattern().section("|",0,0);
QString filt2 = filterRegExp().pattern().section("|",1,1);

QRegExp f1(filt1);
QRegExp f2(filt2);
 
return (sourceModel()->data(index0).toString().contains(f1)
             && sourceModel()->data(index1).toString().contains(f2));

}

QVariant MySortFilterProxyModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (orientation == Qt::Vertical){
if (role == Qt::DecorationRole)
return QIcon(":MyProgram/images/x.png");
return QSortFilterProxyModel::headerData(section, orientation, role);
}
return QSortFilterProxyModel::headerData(section, orientation, role);
}
@

My filterChanged() slot:
@
void MainWindow::filterChanged(const QString &filt)
{
QString toFilt = filt;
QString filt1, filt2= "";

filt1 = ui->colOneFilterLineEdit->text();
filt2 = ui->colTwoFilterLineEdit->text();
toFilt = filt1 + "|" + filt2;

myProxyModel->setFilterFixedString(toFilt);
}
@

Here is the model setup and the line of code that detects the particular word and then places the X in the vertical header:
@
parseModel = new QStandardItemModel(0, 2, this);
parseModel ->setHeaderData(0, Qt::Horizontal, "Direction");
parseModel ->setHeaderData(1, Qt::Horizontal, "Street");

//filtering proxy model for parsing table model
proxyModel = new MySortFilterProxyModel;
proxyModel->setSourceModel(parseModel);

// ... Code to read in file line by line and parse each line into the model. If the "word" is found, set wordPresent to true ...

if (wordPresent){
parseModel->setHeaderData(row,Qt::Vertical,QIcon(":MyProgram/images/x.png"),Qt::DecorationRole);
}
@

The problem I'm having is that the line of code that checks for the particular word and then places an X in the vertical column works fine when there's no QSortFilterProxyModel. That is to say the X shows up fine in the vertical header. Once I attach the proxy model, the X goes away. So I did some Google searches and saw suggestions to implement QSortFilterProxyModel::headerData(), which I tried above. But this winds up placing an X on every single row as well as a row number, so I don't think I'm doing it properly. I also tried returning a QVariant() when no Vertical or DecorationRole was detected in the mysortfilterproxymodel, but that essentially erased the vertical header.

Can anybody help me understand where I'm going wrong and provide a suggestion to right the ship??? Thanks so much!