QT global mouse listener

Question

I'm new to QT from Java. Is there something like this: https://code.google.com/p/jnativehook/ for QT? Can I get all the mouse events with coordinates? I've done the following:

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::MouseButtonRelease)
    {
      QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
      ui->listWidget->addItem(QString("Mouse pressed: %1,%2").arg(mouseEvent>pos().x()).arg(mouseEvent->pos().y()));
    }
  return false;
}

This works fine but it only does it inside my Application and not system wide. What can I do to get this working in QT? Also this only needs to run on windows...

Answer 1

It's actually very simple. I did not find ANY examples or anything.

I then found a video on YouTube which shows exactly what I'm searching for (For the keyboard but the mouse is basically the same).

So if ever someone needs this here you go:

#include <Windows.h>
#pragma comment(lib, "user32.lib")
HHOOK hHook = NULL;
using namespace std;

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam) {   
    switch( wParam )
    {
      case WM_LBUTTONDOWN:  qDebug() << "Left click"; // Left click
    }
    return CallNextHookEx(hHook, nCode, wParam, lParam);
}

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
hHook = SetWindowsHookEx(WH_MOUSE_LL, MouseProc, NULL, 0);
if (hHook == NULL) {
    qDebug() << "Hook failed";
}
ui->setupUi(this);
}

The following codes can be used inside the switch to detect which event was received:

• WM_MOUSEMOVE = 0x200
• WM_LBUTTONDOWN = 0x201
• WM_LBUTTONUP = 0x202
• WM_LBUTTONDBLCLK = 0x203
• WM_RBUTTONDOWN = 0x204
• WM_RBUTTONUP = 0x205
• WM_RBUTTONDBLCLK = 0x206
• WM_MBUTTONDOWN = 0x207
• WM_MBUTTONUP = 0x208
• WM_MBUTTONDBLCLK = 0x209
• WM_MOUSEWHEEL = 0x20A
• WM_XBUTTONDOWN = 0x20B
• WM_XBUTTONUP = 0x20C
• WM_XBUTTONDBLCLK = 0x20D
• WM_MOUSEHWHEEL = 0x20E