onPanUpdate

The onPanUpdate event is a callback function in many graphical user interface frameworks and game development engines. It is triggered whenever a user performs a panning gesture on a touch-enabled device or with a mouse. Panning typically involves dragging one or more fingers or the mouse cursor across the screen to move the view or an object within the interface.

When a pan gesture begins, the framework typically fires an onPanStart event. As the user continues to drag, the onPanUpdate event is called repeatedly. Each time this event fires, it usually provides information about the current position of the gesture, often as coordinates relative to the screen or a specific element. This data allows the application to update the display in real-time, such as scrolling a document, moving a character, or resizing a window.

Once the user lifts their finger or releases the mouse button, an onPanEnd event is usually triggered, signaling the completion of the gesture. Developers utilize the data provided by onPanUpdate to implement smooth and responsive panning interactions, making applications feel more intuitive and interactive. The precise parameters passed to the onPanUpdate callback can vary between different frameworks, but generally include information about the gesture's displacement and velocity.