Positioner (Charba - J2CL and GWT charts library based on CHART.JS)

java.lang.Object
- org.pepstock.charba.client.positioner.Positioner

```
public final class Positioner
extends Object
```
Manages the custom tooltip positioner. With a custom positioner you can decide where the tooltip can appear returning the point in the canvas.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static Positioner`	`get()`	Singleton object to get the tooltip positioner instance
`IsTooltipPosition`	`getTooltipPosition(String name)`	Returns the tooltip positioner implementation by tooltip position name.
`boolean`	`hasTooltipPosition(String name)`	Returns `true` if the custom positioner has been registered, otherwise `false`.
`void`	`register(TooltipPositioner positioner)`	Register the tooltips positioner to CHART.JS.
`void`	`unregister(CustomTooltipPosition position)`	Unregister the tooltips positioner to CHART.JS. Pay attention that when a tooltip positioner is unregistered, if any charts, which still have the tooltip position of the positioner, will fail.

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

- Method Detail
  - get
```
public static Positioner get()
```
    Singleton object to get the tooltip positioner instance
    
    Returns:
    
    tooltip positioner instance.
  - hasTooltipPosition
```
public boolean hasTooltipPosition(String name)
```
    Returns true if the custom positioner has been registered, otherwise false.
    
    Parameters:
    
    name - the name of custom tooltip position to use in the tooltip
    
    Returns:
    
    true if the custom positioner has been registered, otherwise false
  - getTooltipPosition
```
public IsTooltipPosition getTooltipPosition(String name)
```
    Returns the tooltip positioner implementation by tooltip position name. If not exists, returns null.
    
    Parameters:
    
    name - the name of custom tooltip position to use in the tooltip
    
    Returns:
    
    the tooltip positioner implementation. If not exists, returns null.
  - register
```
public void register(TooltipPositioner positioner)
```
    Register the tooltips positioner to CHART.JS.
    
    Parameters:
    
    positioner - tooltip positioner instance to invoke
  - unregister
```
public void unregister(CustomTooltipPosition position)
```
    Unregister the tooltips positioner to CHART.JS.
    Pay attention that when a tooltip positioner is unregistered, if any charts, which still have the tooltip position of the positioner, will fail.
    
    Parameters:
    
    position - custom tooltip position instance