ev3dev.hardware.display

Class DisplayInterface

java.lang.Object

ev3dev.hardware.display.DisplayInterface

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

OwnedDisplay, StolenDisplay

public abstract class DisplayInterface
extends java.lang.Object
implements java.io.Closeable

Display manager interface.

This class provides interface for switching between text and graphics display modes. It also provides interface for opening graphics framebuffer.

Since:

2.4.7

Field Summary

Fields

Modifier and Type	Field and Description
protected JavaFramebuffer	fbInstance

Constructor Summary

Constructors

Constructor and Description
DisplayInterface()

Method Summary

Modifier and Type	Method and Description
protected void	closeFramebuffer() Close the internal framebuffer.
protected void	initializeFramebuffer(NativeFramebuffer backend, boolean enable) Initialize new internal instance of JavaFramebuffer.
abstract JavaFramebuffer	openFramebuffer() Get the framebuffer for the system display.
void	releaseFramebuffer(JavaFramebuffer fb) Remove all references to this framebuffer.
abstract void	switchToGraphicsMode() Switch the display to a graphics mode.
abstract void	switchToTextMode() Switch the display to a text mode.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Field Detail

fbInstance

protected JavaFramebuffer fbInstance

Constructor Detail

DisplayInterface

public DisplayInterface()

Method Detail

switchToGraphicsMode

public abstract void switchToGraphicsMode()

Switch the display to a graphics mode.

Throws:

java.lang.RuntimeException - when the switch fails

switchToTextMode

public abstract void switchToTextMode()

Switch the display to a text mode.

Throws:

java.lang.RuntimeException - when the switch fails

openFramebuffer

public abstract JavaFramebuffer openFramebuffer()

Get the framebuffer for the system display.

The framebuffer is initialized only once, later calls return references to the same instance.

Returns:

Java framebuffer compatible with the system display.

Throws:

java.lang.RuntimeException - when switch to graphics mode or the framebuffer initialization fails.

releaseFramebuffer

public void releaseFramebuffer(JavaFramebuffer fb)

Remove all references to this framebuffer.

Parameters:

fb - Framebuffer to remove.

closeFramebuffer

protected void closeFramebuffer()

Close the internal framebuffer.

initializeFramebuffer

protected void initializeFramebuffer(NativeFramebuffer backend,
                                     boolean enable)

Initialize new internal instance of JavaFramebuffer.

Parameters:

backend - Device behind JavaFramebuffer.

enable - Whether to enable framebuffer flushing from the beginning.