[SOLVED] Subclasing QHeaderView - mouseReleaseEvent() re-implamantaion issue

Aviad Rotstein

Hi,

[QT 5.5.1 | OS: Linux]

Here is my code:

Header:

class MyHeaderItem: public QHeaderView
{
public:
    MyHeaderItem(QWidget * parent = 0);

protected:
    virtual void paintSection(QPainter* poPainter, const QRect& oRect, int iLogicalIndex) const;

    virtual void mouseReleaseEvent(QMouseEvent *e);
}

Source:

MyHeaderItem::MyHeaderItem(QWidget *parent)
    :QHeaderView(Qt::Horizontal, parent)
{
}

void MyHeaderItem::paintSection(QPainter *poPainter, const QRect &oRect, int iLogicalIndex) const
{
        QHeaderView::paintSection(poPainter, oRect, iLogicalIndex);
        // Some code
}

void MyHeaderItem::mouseReleaseEvent(QMouseEvent *e)
{
    QHeaderView::mouseReleaseEvent(e);
}

My Problem:
User can't sort the table items by clicking the header sections.
Hypothesis
When the user click on header section, we enter to My mouseReleaseEvent(), but Its seem that the QHeaderView
mouseReleaseEvent() is not executed.

Any ideas?

Thanx for advanced,
Aviad

SGaist

Hi and welcome to devnet,

What view are you using ? Did you make it sortable ?

Aviad Rotstein

Hi,
Thanks for your rapid replay...

I'm using QTableView, and yes, I make it sortable.
Furthermore, the triangular sort sign is shown, but do not 'flip' at mouse clicked...

SGaist

Can you share the code you use to initialize everything ?

Aviad Rotstein

Something like this:

//////////////////////////////////////////
// Subclasing QAbstractTableModel - header
//////////////////////////////////////////
MyQAbstractTableModel : public QAbstractTableModel
{
public:
    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;
    QVariant headerData ( int section,Qt::Orientation orientation, int role) const;
}

//////////////////////////////////////////
// Main code
//////////////////////////////////////////

// Allocate table view
QTableView poTableView =
            new QTableView;

// Allocate header
MyHeaderItem poHeaderView =
            new MyHeaderItem(this);

// Set table header
poTableView->setHorizontalHeader(poHeaderView);

// Allocate model
MyQAbstractTableModel  * poModel =  new MyQAbstractTableModel;


// Set table view model
poTableView->setModel(poModel);

// Set sorting enabled
poTableView->setSortingEnabled(true);

// Hide grid
poTableView->setShowGrid(false);

I hope I do not miss something important...

Thanks

Aviad Rotstein

OK,
all I want to do is to add icons to the header sections. Lets say I do it by the headerData() decorationRole.

Now I have another problem - How can I set the alignment of the icon to the center?

Thanks,
Aviad

Aviad Rotstein

Now, I make my way like this, using this idea, when my drawControl function is:

void drawControl(ControlElement oCtrElement, const QStyleOption * poStylrOptionption, QPainter * poPainter, const QWidget * poWidget = 0) const
    {
        if (oCtrElement == CE_HeaderLabel) {

            QStyleOptionHeader *poStyleOptionHeader =
                    (QStyleOptionHeader *) poStylrOptionption;

            QIcon oIcon = qvariant_cast<QIcon>(poStyleOptionHeader->icon);

            if(oIcon.isNull()){
                QProxyStyle::drawControl(oCtrElement, poStylrOptionption, poPainter, poWidget);
                return;
            }

            QSize oIconSize = QSize(15, 15);

            QRect oRect = poStyleOptionHeader->rect;
            QPixmap oIconPixmap = oIcon.pixmap(oIconSize.width(),oIconSize.height());

            poPainter->drawPixmap(oRect.left() + (oRect.width() / 2), oRect.top(), oIconPixmap.width(), oIconPixmap.height(), oIconPixmap);
            return;
        }
        QProxyStyle::drawControl(oCtrElement, poStylrOptionption, poPainter, poWidget);
    }

So, my first problem do not solved' but i found workaround. Hope Its will be useful for somebody...

Aviad

SGaist

Add:

setSectionsClickable(true);
setHighlightSections(true);

to your custom header constructor.

On a side note MyHeaderItem is not really a good name for a QHeaderView, item is rather used for model elements.

Aviad Rotstein

Yes!!
Exactly what I need.
Thanks allot!!

SGaist

You're welcome !

By the way, no need to modify the thread title, just use the "Topic Tool" button to mark it as solved :)