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

java.lang.Object
- org.pepstock.charba.client.events.HandlerManager

Direct Known Subclasses:

AbstractChart
```
public abstract class HandlerManager
extends Object
```
Manager to add, remove event handlers and firing events to registered handlers.
This is currently implemented by all charts.

Author:

Andrea "Stock" Stocchero

Constructor Summary

Constructors
Modifier Constructor Description

protected HandlerManager()
Creates an empty handler manager

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`HandlerRegistration`	`addHandler(EventHandler handler, EventType type)`	Adds a event handler.
`void`	`fireEvent(Event event)`	Fires the event to the handlers.
`int`	`getHandlerCount(EventType type)`	Returns the amount of handlers for a specific event type.
`protected abstract IsChart`	`getSource()`	Returns a chart instance as source for all events.
`boolean`	`isEventHandled(EventType type)`	Returns `true` if there is any event handler for event type passed as argument.

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

- Constructor Detail
  - HandlerManager
```
protected HandlerManager()
```
    Creates an empty handler manager
- Method Detail
  - getSource
```
protected abstract IsChart getSource()
```
    Returns a chart instance as source for all events.
    
    Returns:
    
    a chart instance as source for all events
  - addHandler
```
public HandlerRegistration addHandler(EventHandler handler,
                                      EventType type)
```
    Adds a event handler.
    
    Parameters:
    
    handler - handler instance to add
    
    type - the event type associated with handler
    
    Returns:
    
    the handler registration in order to remove the handler later
  - fireEvent
```
public void fireEvent(Event event)
```
    Fires the event to the handlers.
    
    Parameters:
    
    event - the event to fire
  - getHandlerCount
```
public final int getHandlerCount(EventType type)
```
    Returns the amount of handlers for a specific event type.
    
    Parameters:
    
    type - event type to use to get the amount of handlers
    
    Returns:
    
    the amount of handlers for a specific event type
  - isEventHandled
```
public final boolean isEventHandled(EventType type)
```
    Returns true if there is any event handler for event type passed as argument.
    
    Parameters:
    
    type - event type to check
    
    Returns:
    
    true if there is any event handler for event type passed as argument