events.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QCheckBox>
#include <QMouseEvent>
 
class MyCheckBox : public QCheckBox
{
public:
    void mousePressEvent(QMouseEvent *event) override;
};
 
void MyCheckBox::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        // handle left mouse button here
    } else {
        // pass on other buttons to base class
        QCheckBox::mousePressEvent(event);
    }
}
 
class MyWidget : public QWidget
{
public:
    bool event(QEvent *event) override;
};
 
static const int MyCustomEventType = 1099;
 
class MyCustomEvent : public QEvent
{
public:
    MyCustomEvent() : QEvent((QEvent::Type)MyCustomEventType) {}
};
 
bool MyWidget::event(QEvent *event)
{
    if (event->type() == QEvent::KeyPress) {
        QKeyEvent *ke = static_cast<QKeyEvent *>(event);
        if (ke->key() == Qt::Key_Tab) {
            // special tab handling here
            return true;
        }
    } else if (event->type() == MyCustomEventType) {
        MyCustomEvent *myEvent = static_cast<MyCustomEvent *>(event);
        // custom event handling here
        return true;
    }
 
    return QWidget::event(event);
}
 
int main()
{
}