Java Programming | MouseWheelListener Java | Java MouseWheelListener | Java Swing tutorial |Java GUI

The listener interface for receiving mouse wheel events on a component. (For clicks and other mouse events, use the MouseListener. For mouse movement and drags, use the MouseMotionListener.)

The class that is interested in processing a mouse wheel event implements this interface (and all the methods it contains).

The listener object created from that class is then registered with a component using the component's addMouseWheelListener method. A mouse wheel event is generated when the mouse wheel is rotated. When a mouse wheel event occurs, that object's mouseWheelMoved method is invoked.

How to Write a Mouse-Wheel Listener

Mouse-wheel events notify when the wheel on the mouse rotates. For information on listening to other mouse events, such as clicks, see How to Write a Mouse Listener. For information on listening to mouse-dragged events, see How to Write a Mouse-Motion Listener. Not all mice have wheels and, in that case, mouse-wheel events are never generated. There is no way to programmatically detect whether the mouse is equipped with a mouse wheel.

Alternatively, use the corresponding Mousewheellistener class, which implements the MouseWheelListener interface, to create a MouseWheelEvent and override the methods for the specific events.

Usually it is not necessary to implement a mouse-wheel listener because the mouse wheel is used primarily for scrolling. Scroll panes automatically register mouse-wheel listeners that react to the mouse wheel appropriately.

However, to create a custom component to be used inside a scroll pane you may need to customize its scrolling behavior — specifically you might need to set the unit and block increments. For a text area, for example, scrolling one unit means scrolling by one line of text. A block increment typically scrolls an entire "page", or the size of the viewport. For more information, see Implementing a Scrolling-Savvy Client in the How to Use Scroll Panes page.

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Java Programming | MouseWheelListener Java | Java MouseWheelListener | Java Swing tutorial |Java GUI
Java Programming | MouseWheelListener Java | Java MouseWheelListener | Java Swing tutorial |Java GUI
Java Programming | MouseWheelListener Java | Java MouseWheelListener | Java Swing tutorial |Java GUI

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Nicely demonstrated mouse wheel listener tutorial