Proper click event - c++

Question

I have borderless form with button like in this question
Problem is that I can't click button. It works only if I perform double-click not changing position over the button. How to check that user i performing click (not drag)?
Here come code:
bool LoginForm::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QMouseEvent::MouseButtonPress)
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
if (obj == ui.loginButton)
{
QPoint absPos = ui.loginButton->mapToParent(QPoint(0, 0));
m_dragPosition = (mouseEvent->pos() + absPos);
return true;
}
}
return false;
}
void LoginForm::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
{
m_dragPosition = event->globalPos() - frameGeometry().topLeft();
event->accept();
}
}
void LoginForm::mouseMoveEvent(QMouseEvent *event)
{
if (event->buttons() & Qt::LeftButton)
{
QPoint coord = event->globalPos() - m_dragPosition;
move(coord);
event->accept();
}
}

Answer 1

How to check that user is performing click (not drag)?
It should be easier. Don't steal the event from your button. Such approach is borrowed from Qt example: Music Player. See musicplayer.cpp for details.
void LoginForm::mousePressEvent(QMouseEvent *event)
{
m_dragPosition = event->globalPos() - pos();
event->accept();
}
void LoginForm::mouseMoveEvent(QMouseEvent *event)
{
move(event->globalPos() - m_dragPosition);
event->accept();
}
void LoginForm::mouseReleaseEvent(QMouseEvent *event)
{
m_dragPosition = QPoint();
event->accept();
}

Answer 2

The simpliest way is disable drag clicking on buttonbool
LoginForm::LoginForm(QWidget *parent)
: QWidget(parent)
{
...
m_isDragButton = false;
}
LoginForm::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QMouseEvent::MouseButtonPress)
{
QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
if (obj == ui.loginButton)
m_isDragButton = true;
}
return false;
}
void LoginForm::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
{
m_dragPosition = event->globalPos() - frameGeometry().topLeft();
event->accept();
}
}
void LoginForm::mouseMoveEvent(QMouseEvent *event)
{
if (!m_isDragButton)
if (event->buttons() & Qt::LeftButton)
{
QPoint coord = event->globalPos() - m_dragPosition;
move(coord);
event->accept();
}
}
void LoginForm::mouseReleaseEvent(QMouseEvent *event)
{
m_isDragButton = false;
m_dragPosition = QPoint();
event->accept();
}