QHeaderView induvidual background colors

[Andy314]

@JonB said in QHeaderView induvidual background colors:

@Andy314

class AdvHeaderView : public QHeaderView;

You are finding that your derived AdvHeaderView is not producing any signals, is that right? Did you put Q_OBJECT macro in your declaration/definition of AdvHeaderView? Not sure, that may be required here?

I seen that it produces no signals. Unfortunately Q_OBJECT wasn't the problem

class AdvHeaderView : public QHeaderView
{
    Q_OBJECT
public:
    AdvHeaderView(Qt::Orientation orientation, QWidget *parent = nullptr)
        : QHeaderView(orientation, parent) {}
protected:
    void paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const override;
}

[JonB]

@Andy314

• Temporarily replace your AdvHeaderView with a plain QHeaderView. Does the signal work?
• Is it just the sectionClicked() signal which does not work or all signals do not work?
• Make sure your headerClicked() has a qDebug() so we are sure it not getting called and/or try a lambda with just qDebug()in it as the slot.

[Andy314]

@JonB said in QHeaderView induvidual background colors:

@Andy314

• Temporarily replace your AdvHeaderView with a plain QHeaderView. Does the signal work?
• Is it just the sectionClicked() signal which does not work or all signals do not work?
• Make sure your headerClicked() has a qDebug() so we are sure it not getting called and/or try a lambda with just qDebug()in it as the slot.

If I reset the integrated HeaderView all works.
I had integrated debug messages.

Signal SectionResized and GeomtryChaged work always. All Mouse Enter/Click/DoubleClick etc. dont work.

[JonB]

@Andy314
On your AdvHeaderView instance what does bool QHeaderView::sectionsClickable() const return? Do you need to call void QHeaderView::setSectionsClickable(bool clickable) with true?

[Andy314]

@JonB said in QHeaderView induvidual background colors:

@Andy314
On your AdvHeaderView instance what does bool QHeaderView::sectionsClickable() const return? Do you need to call void QHeaderView::setSectionsClickable(bool clickable) with true?

Yeh, that was the problem. Thank you for the tip.

[JonB]

@Andy314
What I do not know is why/how a derived QHeaderView does not get this set as a base QHeaderView does. Perhaps a Qt/C++ expert would care to enlighten us?

[Pl45m4]

@JonB said in QHeaderView induvidual background colors:

as a base QHeaderView does.

Are you sure about that? Haven't checked the code but this from the documentation

Returns true if the header is clickable; otherwise returns false. A clickable header could be set up to allow the user to change the representation of the data in the view related to the header.

sounds like it's not the default in QHeaderView

[JonB]

@Pl45m4

Are you sure about that?

No, I am not sure. I am relying on the OP's statement that with a non-subclassed QHeaderView in his QTableView clicking works (by default) while as soon as he sub-classes to shown AdvHeaderView it does not work. And wondering how that would be.

[Christian Ehrlicher]

@JonB said in QHeaderView induvidual background colors:

And wondering how that would be.

It was enabled in the ui but since the header gets replaced in c++ it was overridden.

[JonB]

@Christian-Ehrlicher said in QHeaderView induvidual background colors:

It was enabled in the ui but since the header gets replaced in c++ it was overridden.

Ah, no wonder, at least that makes sense!

[Andy314]

@JonB said in QHeaderView induvidual background colors:

@Andy314
What I do not know is why/how a derived QHeaderView does not get this set as a base QHeaderView does. Perhaps a Qt/C++ expert would care to enlighten us?

That is exact the problem I struggled.
From the logic it can only be that the QTableView itself configures its QHeaderView correct.
Indeed I found the code for it:

void QTableViewPrivate::init()
{
    Q_Q(QTableView);
    q->setEditTriggers(editTriggers|QAbstractItemView::AnyKeyPressed);
    QHeaderView *vertical = new QHeaderView(Qt::Vertical, q);
    vertical->setSectionsClickable(true);
    vertical->setHighlightSections(true);
    q->setVerticalHeader(vertical);
    QHeaderView *horizontal = new QHeaderView(Qt::Horizontal, q);
    horizontal->setSectionsClickable(true);  // Here is the code ****************************
    horizontal->setHighlightSections(true);
    q->setHorizontalHeader(horizontal);
    tabKeyNavigation = true;
#if QT_CONFIG(abstractbutton)
    cornerWidget = new QTableCornerButton(q);
    cornerWidget->setFocusPolicy(Qt::NoFocus);
    QObject::connect(cornerWidget, SIGNAL(clicked()), 
q, SLOT(selectAll()));
#endif
}