Custom widget table sort

[giantdragon]

All elements in given column will be custom progress bars.
In operator "<" you pass "const QTableWidgetItem&", but I need to access to the custom progress bar's property, it seems that I need to cast "this" and "other" to custom progress bar type, but dynamic_cast or "(ProgressBar*) this" doen't work.

[wysota]

If you want to do it properly then store the value of progress in your model (aka item data) and apply a custom delegate that will render the looks of a progress bar to the element. Search the forum for information how to implement a custom delegate showing a progress bar.

[Santosh Reddy]

You don't need to cast this, you just to cast other, your operator will look like this

class CustomTableWidgetItem : public QProgressBar, public QTableWidgetItem{
...
}
bool CustomTableWidgetItem::operator<(const QTableWidgetItem& other) const
{
    const QProgressBar *that = dynamic_cast<const QProgressBar *>(&other);
    if(that != 0)
    {
        if(this->value() < that->value())
            return true;
    }
    return false;
}

class CustomTableWidgetItem : public QProgressBar, public QTableWidgetItem{
...
}
bool CustomTableWidgetItem::operator<(const QTableWidgetItem& other) const
{
    const QProgressBar *that = dynamic_cast<const QProgressBar *>(&other);
    if(that != 0)
    {
        if(this->value() < that->value())
            return true;
    }
    return false;
}

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[giantdragon]

Sorting now works, thanks for your answer.
But another problem emerged - I use custom progress bar (not QProgressBar) and reimplemented paintEvent to draw my own progress bar. If I add my bar to table with "setCellWidget" function sorting works, but I see white area instead of progress indicator. If I add it with "setItem" function painting works well, but sorting doesn't work.

[wysota]

Then do it properly (see #6).

[Santosh Reddy]

You need to use both setItem(), and setCellWidget().
You need set the CustomTableWidgetItem on the table using setItem(), and use setCellWidget() somewhere in the ctor (or relevant method) of CustomTableWidgetItem

[giantdragon]

It now both paints and sorts. Thanks.

In my custom table's add method:

...
setCellWidget(i, 1, bar);
setItem(i, 1, bar);

...
setCellWidget(i, 1, bar);
setItem(i, 1, bar);

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