javax.swing.JComponent#addMouseWheelListener ( )源码实例Demo

/**
 * Actually register the rubber as the mouse listener for the provided component.
 *
 * @param component the related component
 */
public final void connectComponent (JComponent component)
{
    // Clean up if needed
    disconnectComponent(this.component);

    // Remember the related component (to get visible rect, etc ...)
    this.component = component;

    if (component != null) {
        // To be notified of mouse clicks
        component.removeMouseListener(this); // No multiple notifications
        component.addMouseListener(this);

        // To be notified of mouse mouvements
        component.removeMouseMotionListener(this); // No multiple notifs
        component.addMouseMotionListener(this);

        // To be notified of mouse  wheel mouvements
        component.removeMouseWheelListener(this); // No multiple notifs
        component.addMouseWheelListener(this);
    }
}
 

/**
 * Actually register the rubber as the mouse listener for the provided
 * component.
 *
 * @param component the related component
 */
public void connectComponent (JComponent component)
{
    // Clean up if needed
    disconnectComponent(this.component);

    // Remember the related component (to get visible rect, etc ...)
    this.component = component;

    // To be notified of mouse clicks
    component.removeMouseListener(this); // No multiple notifications
    component.addMouseListener(this);

    // To be notified of mouse mouvements
    component.removeMouseMotionListener(this); // No multiple notifs
    component.addMouseMotionListener(this);

    // To be notified of mouse  wheel mouvements
    component.removeMouseWheelListener(this); // No multiple notifs
    component.addMouseWheelListener(this);
}
 

/**
   Construct a PanZoomListener that listens for events on a JComponent.
   @param component The component to listen for mouse events on.
*/
public PanZoomListener(JComponent component) {
    this.component = component;
    component.addMouseListener(this);
    component.addMouseMotionListener(this);
    component.addMouseWheelListener(this);
    panTriggerModifiers = InputEvent.BUTTON1_DOWN_MASK;
    zoomTriggerModifiers = InputEvent.BUTTON2_DOWN_MASK;
    zoomThreshold = DEFAULT_MOUSE_ZOOM_THRESHOLD;
    enabled = true;
}
 

@Override
public void addNotify() {
    super.addNotify();
    JComponent comp = getComponent();
    if (comp != null) {
        comp.addMouseWheelListener(this);
    }
}
 

public void register(JComponent node) {
  node.addMouseMotionListener(mouseMotionEventHandler);
  node.addMouseListener(mouseEventHandler);
  node.addMouseWheelListener(mouseWheelEventHandler);
}