Qt Creator, C++, mouse over function - c++

Question

I want to change the color of an ellipse when I move my mouse over it.
But I haven't found anything from reference and auto-complete from Qt Creator.
Do you guys know how to do it?
Some of my code:
void DrawingWidget::paintEvent(QPaintEvent *event) {
QPainter painter(this);
painter.fillRect(event->rect(), Qt::white);
for(int i = 0; i < pointList.size(); i++) {
if (pointList[i].x() >= 0 && pointList[i].y() >= 0)
painter.drawEllipse(pointList[i], 10, 10);
}
painter.drawLines(lineList);
m_mainWindow->updateCount();
}
Mouse press event handler:
void DrawingWidget::mousePressEvent(QMouseEvent *event) {
if (event->button() == Qt::LeftButton
&& event->buttons() == Qt::LeftButton) {
// DO STUFFF
}
}
Mouse move event handler:
void DrawingWidget::mouseMoveEvent(QMouseEvent *event) {
if (m_mainWindow->getSelectedTool() == MainWindow::moveVertexTool) {
m_x = event->x();
m_y = event->y();
if (isPointNear(m_x, m_y)) {
//STUFF
}
update();
}
}
}
Now I just need a mouse OVER event (handler).

Answer 1

I think what you are looking for are enter and leave events.

Answer 2

Use QWidget::underMouse() for check if the widget is under the mouse cursor.
For example:
void IconButton::paintEvent(QPaintEvent *)
{
QPainter painter(this);
// Note isDown should really use the active state but in most styles
// this has no proper feedback
QIcon::Mode mode = QIcon::Disabled;
if (isEnabled()) {
if (isDown())
mode = QIcon::Selected;
else
mode = underMouse() ? QIcon::Active : QIcon::Normal;
}
QPixmap pixmap = icon().pixmap(iconSize(), mode);
QRect pixmapRect = QRect(0, 0, pixmap.width(), pixmap.height());
pixmapRect.moveCenter(rect().center());
if (m_autoHide)
painter.setOpacity(m_iconOpacity);
painter.drawPixmap(pixmapRect, pixmap);
}
This value is not updated properly during drag and drop operations.