Want to have checkboxes in headers of QTreeWiddget

Qt Enthusiast

I have QTreeWidget and I want to create checkboxes in QtreeWidget headers
for example

I tried following code and it is not working

QTreeWidget myTree = new QtreeWidget;
myTree->setHeaderLabels(QStringList() << tr("name") << tr ("v") << tr("v"));

myTree->setColumnCount(3);
myTree->setHeaderLabels(QStringList() << tr("name") << tr("v") << tr("s"));
QTreeWidgetItem * header =myTree->headerItem();
header->setCheckState(1,Qt::Checked);
header->setCheckState(2,Qt::Checked);

and it is not working Can someone guide me on the same

mrjj

@Qt-Enthusiast
hi
THis should give good hints
http://blog.qt.io/blog/2014/04/11/qt-weekly-5-widgets-on-a-qheaderview/

VRonin

https://wiki.qt.io/Qt_project_org_faq#How_can_I_insert_a_checkbox_into_the_header_of_my_view.3F

P.S.
This was basically a LMGTFY... 😒

Qt Enthusiast

@VRonin

The check box in this not clickable

mrjj

@Qt-Enthusiast
Hi
That part is left as an exercise for the reader.

"You would also need to reimplement the mousePressEvent() http://doc.qt.io/qt-5/qheaderview.html#mousePressEvent to detect when the checkbox is clicked, in order to paint the checked and unchecked states."

Qt Enthusiast

@mrjj
it is there

Qt Enthusiast

Is it possible to have these headers per column basis, I don not see anything in such documenattion

mrjj

@mrjj
http://blog.qt.io/blog/2014/04/11/qt-weekly-5-widgets-on-a-qheaderview/
Actually this sample have issues
It wont call paintSection every time and hence its not redrawn correctly.

It seems that
this->update();
will not always trigger it to paint whole header. ( call paintSection)

Anyone have good input on why ?


#include <QtGui>
#include <QHeaderView>
#include <QTableWidget>
#include <QDebug>

class MyHeader : public QHeaderView {
 public:
  MyHeader(Qt::Orientation orientation, QWidget* parent = 0) : QHeaderView(orientation, parent) {
  }

 protected:
  void paintSection(QPainter* painter, const QRect& rect, int logicalIndex) const {
    painter->save();
    QHeaderView::paintSection(painter, rect, logicalIndex);
    painter->restore();
    qDebug() << "Paint FIRST";
    if (logicalIndex == 0) {
      QStyleOptionButton option;
      option.rect = QRect(10, 10, 10, 10);
      if (isOn)
        option.state = QStyle::State_On;
      else
        option.state = QStyle::State_Off;
      this->style()->drawPrimitive(QStyle::PE_IndicatorCheckBox, &option, painter);
      qDebug() << "Paint logicalIndex";
    }

  }
  void mousePressEvent(QMouseEvent* event) {
    QHeaderView::mousePressEvent(event);

    if (isOn)
      isOn = false;
    else
      isOn = true;

    this->update();

    qDebug() << "mousePressEvent";
  }

 private:
  bool isOn;  
protected:
};


int main(int argc, char** argv) {
  QApplication app(argc, argv);
  QTableWidget table;
  table.setRowCount(4);
  table.setColumnCount(3);

  MyHeader* myHeader = new MyHeader(Qt::Horizontal, &table);
  table.setHorizontalHeader(myHeader);
  table.show();
  return app.exec();
}

Qt Enthusiast

Please suggest the solution

Qt Enthusiast

@Qt-Enthusiast the

the check box is not easily clickable if you can suggest the proper solution

mrjj

@Qt-Enthusiast
Did not find any.
The sample listed on wiki do not repaint headers (always) so that did not work well.

Qt Enthusiast

Can u suggest some alternative solution

mrjj

@Qt-Enthusiast
Hi Sadly no. The sample would work if update() would make the header to be updated but
it do not as far as i can tell.