MouseWheelHandler

java.lang.Object
- org.jfree.chart.MouseWheelHandler

All Implemented Interfaces:

java.awt.event.MouseWheelListener, java.io.Serializable, java.util.EventListener
```
public class MouseWheelHandler
extends java.lang.Object
implements java.awt.event.MouseWheelListener, java.io.Serializable
```
A class that handles mouse wheel events for the ChartPanel class.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

private ChartPanel chartPanel
The chart panel.

(package private) double zoomFactor
The zoom factor.

Constructor Summary

Constructors
Constructor Description

MouseWheelHandler(ChartPanel chartPanel)
Creates a new instance for the specified chart panel.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getZoomFactor()`	Returns the current zoom factor.
`private void`	`handleZoomable(Zoomable zoomable, java.awt.event.MouseWheelEvent e)`	Handle the case where a plot implements the `Zoomable` interface.
`void`	`mouseWheelMoved(java.awt.event.MouseWheelEvent e)`	Handles a mouse wheel event from the underlying chart panel.
`void`	`setZoomFactor(double zoomFactor)`	Sets the zoom factor.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - chartPanel
```
private ChartPanel chartPanel
```
    The chart panel.
  - zoomFactor
```
double zoomFactor
```
    The zoom factor.
- Constructor Detail
  - MouseWheelHandler
```
public MouseWheelHandler(ChartPanel chartPanel)
```
    Creates a new instance for the specified chart panel.
    
    Parameters:
    
    chartPanel - the chart panel (null not permitted).
- Method Detail
  - getZoomFactor
```
public double getZoomFactor()
```
    Returns the current zoom factor. The default value is 0.10 (ten percent).
    
    Returns:
    
    The zoom factor.
    
    See Also:
    
    setZoomFactor(double)
  - setZoomFactor
```
public void setZoomFactor(double zoomFactor)
```
    Sets the zoom factor.
    
    Parameters:
    
    zoomFactor - the zoom factor.
    
    See Also:
    
    getZoomFactor()
  - mouseWheelMoved
```
public void mouseWheelMoved(java.awt.event.MouseWheelEvent e)
```
    Handles a mouse wheel event from the underlying chart panel.
    
    Specified by:
    
    mouseWheelMoved in interface java.awt.event.MouseWheelListener
    
    Parameters:
    
    e - the event.
  - handleZoomable
```
private void handleZoomable(Zoomable zoomable,
                            java.awt.event.MouseWheelEvent e)
```
    Handle the case where a plot implements the Zoomable interface.
    
    Parameters:
    
    zoomable - the zoomable plot.
    
    e - the mouse wheel event.