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

java.lang.Object
- org.pepstock.charba.client.commons.JsHelper

```
public final class JsHelper
extends Object
```
This is a singleton wrapper for Java native object which is wrapping a CHARBA java script object implementation with some utilities to act on java script objects.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`<T> T`	`cast(Object object)` Performs unchecked cast to a type. Using this method can have an incorrect type of the object to the rest of the system which will result in hard to debug problems.
`MutationObserverInit`	`createMutationObserverInit()` Creates new instance of observer initialization options.
`static JsHelper`	`get()` Singleton object to get the helper instance
`boolean`	`has(Object object, String key)` Returns a boolean indicating whether the object has the specified property as its own property.
`boolean`	`isCanvas(NativeObjectContainer object, Key key)` Returns `true` if the object is a `Canvas`.
`boolean`	`isCanvasGradient(Object object)` Returns `true` if the object is a `CanvasGradientItem`.
`boolean`	`isCanvasPattern(Object object)` Returns `true` if the object is a `CanvasPatternItem`.
`boolean`	`isImage(NativeObjectContainer object, Key key)` Returns `true` if the object is a `Img`.
`<T> CallbackProxy<T>`	`newCallbackProxy()` Creates new proxy for callback which will pass `this` environment of java script as first argument of callback method.
`int`	`propertyAsInt(NativeObject object, String key)` Returns a property of java script object as integer.
`ObjectType`	`typeOf(Object object)` Returns the java script object type of object.
`ObjectType`	`typeOf(Object object, String key)` Returns the java script object type of a property.

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

- Method Detail
  - get
```
public static JsHelper get()
```
    Singleton object to get the helper instance
    
    Returns:
    
    helper instance.
  - cast
```
public <T> T cast(Object object)
```
    Performs unchecked cast to a type.
    Using this method can have an incorrect type of the object to the rest of the system which will result in hard to debug problems.
    
    Type Parameters:
    
    T - type of the result
    
    Parameters:
    
    object - object which must be cast
    
    Returns:
    
    the object cast to another type
  - createMutationObserverInit
```
public MutationObserverInit createMutationObserverInit()
```
    Creates new instance of observer initialization options.
    
    Returns:
    
    new instance of observer initialization options
  - has
```
public boolean has(Object object,
                   String key)
```
    Returns a boolean indicating whether the object has the specified property as its own property.
    
    Parameters:
    
    object - the object on which to search the property.
    
    key - the string name of the property to test.
    
    Returns:
    
    boolean indicating whether or not the object has the specified property as own property.
  - typeOf
```
public ObjectType typeOf(Object object)
```
    Returns the java script object type of object.
    
    Parameters:
    
    object - the object to get type.
    
    Returns:
    
    the object type
  - typeOf
```
public ObjectType typeOf(Object object,
                         String key)
```
    Returns the java script object type of a property.
    
    Parameters:
    
    object - the object on which to search the property.
    
    key - the string name of the property to test.
    
    Returns:
    
    the object type
  - newCallbackProxy
```
public <T> CallbackProxy<T> newCallbackProxy()
```
    Creates new proxy for callback which will pass this environment of java script as first argument of callback method.
    
    Type Parameters:
    
    T - type of callback wrapped by proxy
    
    Returns:
    
    new proxy for callback.
  - isCanvasPattern
```
public boolean isCanvasPattern(Object object)
```
    Returns true if the object is a CanvasPatternItem.
    
    Parameters:
    
    object - the object instance on which to check
    
    Returns:
    
    true if the object is a CanvasPatternItem
  - isCanvasGradient
```
public boolean isCanvasGradient(Object object)
```
    Returns true if the object is a CanvasGradientItem.
    
    Parameters:
    
    object - the object instance on which to check
    
    Returns:
    
    true if the object is a CanvasGradientItem
  - isCanvas
```
public boolean isCanvas(NativeObjectContainer object,
                        Key key)
```
    Returns true if the object is a Canvas.
    
    Parameters:
    
    object - the object instance on which to check
    
    key - the string name of the property to test.
    
    Returns:
    
    true if the object is a Canvas
  - isImage
```
public boolean isImage(NativeObjectContainer object,
                       Key key)
```
    Returns true if the object is a Img.
    
    Parameters:
    
    object - the object instance on which to check
    
    key - the string name of the property to test.
    
    Returns:
    
    true if the object is a Img
  - propertyAsInt
```
public int propertyAsInt(NativeObject object,
                         String key)
```
    Returns a property of java script object as integer.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    integer value or Undefined.INTEGER if arguments are not consistent

Class JsHelper

Method Summary

Methods inherited from class java.lang.Object

Method Detail

get

cast

createMutationObserverInit

has

typeOf

typeOf

newCallbackProxy

isCanvasPattern

isCanvasGradient

isCanvas

isImage

propertyAsInt