ej.mwt.style.background

Class NoBackground

java.lang.Object

ej.mwt.style.background.NoBackground

All Implemented Interfaces:

Background

public final class NoBackground
extends Object
implements Background

A transparent background.

Field Summary

Fields

Modifier and Type	Field and Description
static NoBackground	NO_BACKGROUND No background singleton to avoid creating several ones.

Method Summary

Modifier and Type	Method and Description
void	apply(GraphicsContext g, int width, int height) Applies the background on a graphics context.
boolean	isTransparent(int width, int height) Tells whether or not this background is transparent.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NO_BACKGROUND

public static final NoBackground NO_BACKGROUND

No background singleton to avoid creating several ones.

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.

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.