#include "MouseEventSpy.h"

#include <QGuiApplication>
#include <QDebug>

void MouseEventSpy::init()
{
    instance();
}


MouseEventSpy* MouseEventSpy::instance()
{
    static MouseEventSpy* inst;
    if (!inst)
    {
        inst = new MouseEventSpy();
        QGuiApplication* app = qGuiApp;
        app->installEventFilter(inst);
    }
    return inst;
}


bool MouseEventSpy::eventFilter(QObject* watched, QEvent* event)
{
    QEvent::Type t = event->type();
    if (isMouseEvent(t)
         && event->spontaneous() // Take only mouse events from outside of Qt
     )
    {
        emit mouseEventDetected();
    }
    return QObject::eventFilter(watched, event);
}


bool MouseEventSpy::isMouseEvent(QEvent::Type t)
{
    return (t == QEvent::MouseButtonDblClick
            || t == QEvent::MouseButtonPress
            || t == QEvent::MouseButtonRelease
            || t == QEvent::MouseMove);
}