onPanMove

onPanMove is a callback function commonly found in graphical user interface toolkits and game development frameworks. It is triggered whenever a user performs a panning gesture on a screen or within a specific interactive element. A panning gesture typically involves pressing down on a surface and then dragging a finger or mouse cursor across it without lifting.

The onPanMove function is designed to handle the continuous updates that occur during such a drag operation. When the user moves their finger or mouse while the button is held down, this function is invoked repeatedly. It receives information about the current position of the pointer, often in the form of x and y coordinates, and sometimes also the delta (change in position) from the previous event.

Developers use onPanMove to implement various interactive behaviors. For example, in a map application, onPanMove would be used to update the visible portion of the map based on the user's drag direction and distance. In a drawing application, it could be used to draw a continuous line as the user drags the drawing tool. In game development, it might control character movement or camera panning. The precise behavior implemented within onPanMove is entirely dependent on the application's design and the specific gesture being handled.