- Qt 6.9
- Qt GUI
- C++ Classes
- QMouseEvent
- Qt 6.9.0 Reference Documentation

# QMouseEvent Class

The QMouseEvent class contains parameters that describe a mouse event. More...

Header: | `#include <QMouseEvent>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Gui)` `target_link_libraries(mytarget PRIVATE Qt6::Gui)`
qmake: | `QT += gui`
Inherits: | QSinglePointEvent

- List of all members, including inherited members
- Deprecated members
- QMouseEvent is part of Event Classes.

## Public Functions

| QMouseEvent(QEvent::Type type, const QPointF &localPos, const QPointF &globalPos, Qt::MouseButton button, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, const QPointingDevice *device = QPointingDevice::primaryPointingDevice())
| QMouseEvent(QEvent::Type type, const QPointF &localPos, const QPointF &scenePos, const QPointF &globalPos, Qt::MouseButton button, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, const QPointingDevice *device = QPointingDevice::primaryPointingDevice())
Qt::MouseEventFlags | flags() const

## Detailed Description

Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved.

Mouse move events will occur only when a mouse button is pressed down, unless mouse tracking has been enabled with QWidget::setMouseTracking().

Qt automatically grabs the mouse when a mouse button is pressed inside a widget; the widget will continue to receive mouse events until the last mouse button is released.

A mouse event contains a special accept flag that indicates whether the receiver wants the event. You should call ignore() if the mouse event is not handled by your widget. A mouse event is propagated up the parent widget chain until a widget accepts it with accept(), or an event filter consumes it.

Note: If a mouse event is propagated to a widget for which Qt::WA_NoMousePropagation has been set, that mouse event will not be propagated further up the parent widget chain.

The state of the keyboard modifier keys can be found by calling the modifiers() function, inherited from QInputEvent.

The position() function gives the cursor position relative to the widget or item that receives the mouse event. If you move the widget as a result of the mouse event, use the global position returned by globalPosition() to avoid a shaking motion.

The QWidget::setEnabled() function can be used to enable or disable mouse and keyboard events for a widget.

Reimplement the QWidget event handlers, QWidget::mousePressEvent(), QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent(), and QWidget::mouseMoveEvent() to receive mouse events in your own widgets.

See also QWidget::setMouseTracking(), QWidget::grabMouse(), and QCursor::pos().

## Member Function Documentation

### QMouseEvent::QMouseEvent(QEvent::Type type, const QPointF &localPos, const QPointF &globalPos, Qt::MouseButton button, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, const QPointingDevice *device = QPointingDevice::primaryPointingDevice())

Constructs a mouse event object originating from device.

The type parameter must be QEvent::MouseButtonPress, QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick, or QEvent::MouseMove.

The localPos is the mouse cursor's position relative to the receiving widget or item. The cursor's position in screen coordinates is specified by globalPos. The window position is set to the same value as localPos. The button that caused the event is given as a value from the Qt::MouseButton enum. If the event type is MouseMove, the appropriate button for this event is Qt::NoButton. buttons is the state of all buttons at the time of the event, modifiers the state of all keyboard modifiers.

### QMouseEvent::QMouseEvent(QEvent::Type type, const QPointF &localPos, const QPointF &scenePos, const QPointF &globalPos, Qt::MouseButton button, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, const QPointingDevice *device = QPointingDevice::primaryPointingDevice())

Constructs a mouse event object.

The type parameter must be QEvent::MouseButtonPress, QEvent::MouseButtonRelease, QEvent::MouseButtonDblClick, or QEvent::MouseMove.

The points localPos, scenePos and globalPos specify the mouse cursor's position relative to the receiving widget or item, window, and screen or desktop, respectively.

The button that caused the event is given as a value from the Qt::MouseButton enum. If the event type is MouseMove, the appropriate button for this event is Qt::NoButton. buttons is the state of all buttons at the time of the event, modifiers is the state of all keyboard modifiers.

### Qt::MouseEventFlags QMouseEvent::flags() const

Returns the mouse event flags.

The mouse event flags provide additional information about a mouse event.

See also Qt::MouseEventFlag and QGraphicsSceneMouseEvent::flags().