ej.mwt.style.background

Class RoundedBackground

java.lang.Object

ej.mwt.style.background.RoundedBackground

All Implemented Interfaces:

Background

public class RoundedBackground
extends Object
implements Background

Draws a plain color on the background with a round corner.

Should be used in association with a RoundedBorder to:

• anti-alias its edges by using the same color,
• draw a colored border that fits its shape.

The corner radius and border thickness are stored as a char for heap optimization and therefore cannot exceed 65535.

Constructor Summary

Constructors

Constructor and Description
RoundedBackground(int color, int cornerRadius, int borderThickness) Creates a rounded background.

Method Summary

Modifier and Type	Method and Description
void	apply(GraphicsContext g, int width, int height) Applies the background on a graphics context.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
int	getBorderThickness() Gets the border thickness.
int	getColor() Gets the color.
int	getCornerRadius() Gets the corner radius.
int	hashCode() Returns a hash code value for the object.
boolean	isTransparent(int width, int height) Tells whether or not this background is transparent.

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RoundedBackground

public RoundedBackground(int color,
                         int cornerRadius,
                         int borderThickness)

Creates a rounded background.

The given corner radius and border thickness are clamped between 0 and Character.MAX_VALUE.

Parameters:

color - the color.

cornerRadius - the corner radius.

borderThickness - the border thickness.

Method Detail

apply

public void apply(GraphicsContext g,
                  int width,
                  int height)

Description copied from interface: Background

Applies the background on a graphics context.

Specified by:

apply in interface Background

Parameters:

g - the graphics context.

width - the width of the background.

height - the height of the background.

equals

public boolean equals(@Nullable
                      Object obj)

Description copied from class: Object

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Specified by:

equals in interface Background

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

Object.hashCode(), HashMap

getBorderThickness

public int getBorderThickness()

Gets the border thickness.

Returns:

the border thickness.

getColor

public int getColor()

Gets the color.

Returns:

the color.

getCornerRadius

public int getCornerRadius()

Gets the corner radius.

Returns:

the corner radius.

hashCode

public int hashCode()

Description copied from class: Object

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java^TM programming language.)

Specified by:

hashCode in interface Background

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

isTransparent

public boolean isTransparent(int width,
                             int height)

Description copied from interface: Background

Tells whether or not this background is transparent.

A background is considered as transparent if it does not draw every pixel with maximal opacity when it is applied. If a widget has a transparent background, its parent has to be rendered before the widget.

Specified by:

isTransparent in interface Background

Parameters:

width - the width of the background.

height - the height of the background.

Returns:

true if the background is transparent, false otherwise.