Catching QSpinBox text field mouseEvents - c++

Question

I have a reimplemented QDoubleSpinBox. I would like to catch mouseDoubleClickEvent to enable the user to change singleStep by way of QInputDialog::getDouble().
My problem is that when I reimplement the mouseDoubleClickEvent I only catch double clicks that occur over the arrow buttons. I actually want to ignore double clicks that occur in the arrows and only catch double clicks that occur in the text field. I have a feeling that I need to reimplement the mouseDoubleClickEvent of a child of the QDoubleSpinBox, but I'm not sure how to reimplement a child event nor how to select the correct child See my attempt at limiting to a child QRect in code: I think I need to specify which child...?
Thanks.
Edit: corrected class declaration/definition name mismatch.
MyQDoubleSpinBox.h
class MyQDoubleSpinBox : public QDoubleSpinBox
{
Q_OBJECT
public:
MyQDoubleSpinBox(QString str, QWidget *parent = 0);
~MyQDoubleSpinBox();
public slots:
void setStepSize(double step);
private:
double stepSize;
QString name;
protected:
void mouseDoubleClickEvent(QMouseEvent *e);
};
MyQDoubleSpinBox.cpp
#include "MyQDoubleSpinBox.h"
MyQDoubleSpinBox::MyQDoubleSpinBox(QString str, QWidget *parent)
: QDoubleSpinBox(parent), stepSize(1.00), name(str)
{
this->setMinimumWidth(150);
this->setSingleStep(stepSize);
this->setMinimum(0.0);
this->setMaximum(100.0);
}
MyQDoubleSpinBox::~MyQDoubleSpinBox()
{
}
void MyQDoubleSpinBox::setStepSize(double step)
{
this->setSingleStep(step);
}
void MyQDoubleSpinBox::mouseDoubleClickEvent(QMouseEvent *e)
{
if( this->childrenRect().contains(e->pos()) )
{
bool ok;
double d = QInputDialog::getDouble(this,
name,
tr("Step Size:"),
this->singleStep(),
0.0,
1000.0,
2,
&ok);
if(ok)
this->setSingleStep(d);
}
}

Answer 1

A bit of the hack getting ref to child, but it works =)
MyQDoubleSpinBox.h:
class MyQDoubleSpinBox : public QDoubleSpinBox
{
Q_OBJECT
public:
MyQDoubleSpinBox(QString str, QWidget *parent = 0);
~MyQDoubleSpinBox();
public slots:
void setStepSize(double step);
private:
double stepSize;
QString name;
protected:
bool eventFilter(QObject *, QEvent *e);
};
MyQDoubleSpinBox.cpp
MyQDoubleSpinBox::MyQDoubleSpinBox(QString str, QWidget *parent)
: QDoubleSpinBox(parent), stepSize(1.00), name(str)
{
this->setMinimumWidth(150);
this->setSingleStep(stepSize);
this->setMinimum(0.0);
this->setMaximum(100.0);
QLineEdit *editor = this->findChild<QLineEdit *>("qt_spinbox_lineedit");
editor->installEventFilter(this);
}
MyQDoubleSpinBox::~MyQDoubleSpinBox()
{
}
void MyQDoubleSpinBox::setStepSize(double step)
{
this->setSingleStep(step);
}
bool MyQDoubleSpinBox::eventFilter(QObject *, QEvent *e)
{
if (e->type() == QMouseEvent::MouseButtonDblClick)
{ bool ok;
double d = QInputDialog::getDouble(this,
name,
tr("Step Size:"),
this->singleStep(),
0.0,
1000.0,
2,
&ok);
if(ok)
this->setSingleStep(d);
}
return false;
}
Instead of overwriting events, i got ref to underlying QLineEdit and assigned event filter to it. In event filter catch only mouse double click.

Answer 2

You have direct access to QLineEdit using this->lineEdit()
MyQDoubleSpinBox::MyQDoubleSpinBox(QString str, QWidget *parent)
: QDoubleSpinBox(parent), stepSize(1.00), name(str)
{
this->setMinimumWidth(150);
this->setSingleStep(stepSize);
this->setMinimum(0.0);
this->setMaximum(100.0);
QLineEdit *editor = this->lineEdit(); // change here
editor->installEventFilter(this);
}