[SOLVED] Mouse Tracking With GUI Builder

[mrstarware]

Hi, My goal is to create a simple test application where a dial will be moved by the movement of a mouse.
This is to say ONLY the movement of the mouse. I was trying something like

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->setMouseTracking(true);

}@

@void MainWindow::mouseMoveEvent(QMouseEvent* )
{
ui->dial->setValue(4);
}@

However it didn't seem to work. It only worked when the mouse was pressed which was not my goal.

Thank you for your help

[shoyeb]

You can use an event filter on the application.
Define and implement bool MainWindow::eventFilter(QObject*, QEvent*). For example..

@bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::MouseMove)
{
QMouseEvent mouseEvent = static_cast<QMouseEvent>(event);
statusBar()->showMessage(QString("Mouse move (%1,%2)").arg(mouseEvent->pos().x()).arg(mouseEvent->pos().y()));
}
return false;
}
@

Install the event filter when the MainWindows is constructed (or somewhere else). For example..

@MainWindow::MainWindow(...)
{
...
qApp->installEventFilter(this);
...
}
@

[mrstarware]

Thanks! that worked great.

[shoyeb]

please mark ur thread as solved...

[Aj Ay]

Hai mrstarware,

Can you please post your complete code of mouse movements because my requirement is similar one i.e to display co-ordinates on world map with movement of mouse on map.

[Aj Ay]

Hai shoyeb,

Can you help me in my requirement of displaying world map and co-ordinates on map with mouse movements