QMouseEvent

QMouseEvent is a class in the Qt framework that represents mouse events. These events are generated when the user interacts with a widget using the mouse, such as pressing a button, releasing a button, or moving the cursor. The QMouseEvent object carries information about the event, including the type of mouse button involved, the position of the mouse cursor relative to the widget, and the position of the mouse cursor on the global screen.

When a mouse event occurs on a widget, Qt's event handling system dispatches a QMouseEvent to the widget's event handler. Developers can subclass widgets and override specific event handling functions like mousePressEvent, mouseReleaseEvent, and mouseMoveEvent to respond to these events. For instance, mousePressEvent is called when a mouse button is pressed, while mouseMoveEvent is invoked when the mouse cursor is moved over the widget.

Key attributes of a QMouseEvent include its button property, which indicates which mouse button was pressed or released, and its pos() method, which returns the local coordinates of the event. The globalPos() method provides the coordinates relative to the screen. Understanding and utilizing QMouseEvent is fundamental for creating interactive graphical user interfaces with Qt.