QTableView and ItemDelegate for showing a progress bar - c++

Question

I have a QTableView connected to my custom Model:
class QueueItem {
public:
enum QueueStatus { PENDING = 0, INPROGRESS, FINISHED, FAILED };
private:
QueueStatus status_;
QString filename_;
QString localPath_;
long long filesize_;
int progress_;
public:
QueueItem(const QString & file, const QString & localPath) :
filename_(file), localPath_(localPath)
{
filesize_ = 0;
progress_ = 0;
status_ = PENDING;
}
QString getFilename() const
{
return filename_;
}
QString getLocalPath() const
{
return localPath_;
}
long long getFilesize() const
{
return filesize_;
}
int getProgess() const
{
return progress_;
}
QueueStatus getStatus() const
{
return status_;
}
void setProgress(unsigned int prg){
progress_ = prg;
}
void setStatus(QueueItem::QueueStatus status){
status_ = status;
}
};
class QueueModel : public QAbstractTableModel {
private:
QList<QueueItem> data_;
public:
QueueModel(QObject * parent = 0) : QAbstractTableModel(parent) {}
int rowCount(const QModelIndex &) const { return data_.count(); }
int columnCount(const QModelIndex &) const { return 4; }
QVariant data(const QModelIndex &index, int role) const {
if (role != Qt::DisplayRole && role != Qt::EditRole) return QVariant();
const QueueItem & queueItem = data_[index.row()];
switch (index.column()) {
case 0: return queueItem.getFilename();
case 1: return queueItem.getFilesize() + " bytes";
case 2: return queueItem.getProgess() + "%";
case 3: {
std::string str;
switch (queueItem.getStatus()){
case QueueItem::PENDING :
str = "Pending";
break;
case QueueItem::INPROGRESS:
str = "In Progress";
break;
case QueueItem::FINISHED:
str = "Finished";
break;
case QueueItem::FAILED:
str = "Failed";
break;
default:
str = "Unkown";
}
return QString::fromStdString(str);
}
default: return QVariant();
};
}
QVariant headerData(int section, Qt::Orientation orientation, int role) const {
if (orientation != Qt::Horizontal) return QVariant();
if (role != Qt::DisplayRole) return QVariant();
switch (section) {
case 0: return "Filename";
case 1: return "Filesize";
case 2: return "Progress";
case 3: return "Status";
default: return QVariant();
}
}
void refresh(){
emit dataChanged(index(0, 0), index(data_.count()-1, 5));
}
void append(const QueueItem & queueItem) {
beginInsertRows(QModelIndex(), data_.count(), data_.count());
data_.append(queueItem);
endInsertRows();
}
};
That's how it's used:
// Queue Table
ui.tvQueue->setModel(&queueModel_);
ui.tvQueue->setItemDelegateForColumn(2,new ProgressBarDelegate(this));
So I created the following ItemDelegate:
class ProgressBarDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
ProgressBarDelegate::ProgressBarDelegate(QObject *parent = 0)
: QStyledItemDelegate(parent)
{
}
void ProgressBarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
int progress = index.model()->data().toInt(); // How do I access my models .progress_ property?
QStyleOptionProgressBar progressBarOption;
progressBarOption.rect = option.rect;
progressBarOption.minimum = 0;
progressBarOption.maximum = 100;
progressBarOption.progress = progress;
progressBarOption.text = QString::number(progress) + "%";
progressBarOption.textVisible = true;
QApplication::style()->drawControl(QStyle::CE_ProgressBar,
&progressBarOption, painter);
}
};
The progressbar is correctly shown, but it is always at position 0. I expect the problem to be located in the last section at the line int progress = index.model()->data().toInt();
I'm not getting the correct progress_ value of the model, but always 0. How do I access my models progress_ property?

Answer 1

You can't convert a string containing other than numeric characters to the number. Your column 2 data contain a % character, so remove it before conversion:
int progress = index.model()->data().toString().replace("%", "").toInt();