java.awt

Class GraphicsDevice

java.lang.Object

java.awt.GraphicsDevice

public abstract class GraphicsDevice
extends Object

This describes a graphics device available to the given environment. This includes screen and printer devices, and the different configurations for each device. Also, this allows you to create virtual devices which operate over a multi-screen environment.

Since:

1.3

See Also:

GraphicsEnvironment, GraphicsConfiguration

Field Summary

Fields

Modifier and Type	Field and Description
static int	TYPE_IMAGE_BUFFER Device is an image buffer not visible to the user.
static int	TYPE_PRINTER Device is a printer.
static int	TYPE_RASTER_SCREEN Device is a raster screen.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	GraphicsDevice() The default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
int	getAvailableAcceleratedMemory() Return the number of bytes available in accelerated memory on this device.
GraphicsConfiguration	getBestConfiguration(GraphicsConfigTemplate template) Return the best configuration, according to the criteria in the given template.
abstract GraphicsConfiguration[]	getConfigurations() Return all configurations valid for this device.
abstract GraphicsConfiguration	getDefaultConfiguration() Return the default configuration for this device.
DisplayMode	getDisplayMode() Returns the current display mode of this device, or null if unknown.
DisplayMode[]	getDisplayModes() Return an array of all available display modes.
Window	getFullScreenWindow() Returns the current full-screen window of the device, or null if no window is full-screen.
abstract String	getIDstring() Returns an identification string for the device.
abstract int	getType() Returns the type of the device.
boolean	isDisplayChangeSupported() Returns whether this device supports low-level display changes.
boolean	isFullScreenSupported() Returns true if the device supports full-screen exclusive mode.
void	setDisplayMode(DisplayMode mode) Sets the display mode.
void	setFullScreenWindow(Window w) Toggle the given window between full screen and normal mode.

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_RASTER_SCREEN

public static final int TYPE_RASTER_SCREEN

Device is a raster screen.

See Also:

Constant Field Values

TYPE_PRINTER

public static final int TYPE_PRINTER

Device is a printer.

See Also:

Constant Field Values

TYPE_IMAGE_BUFFER

public static final int TYPE_IMAGE_BUFFER

Device is an image buffer not visible to the user.

See Also:

Constant Field Values

Constructor Detail

GraphicsDevice

protected GraphicsDevice()

The default constructor.

See Also:

GraphicsEnvironment.getScreenDevices(), GraphicsEnvironment.getDefaultScreenDevice(), GraphicsConfiguration.getDevice()

Method Detail

getType

public abstract int getType()

Returns the type of the device.

Returns:

the device type

See Also:

TYPE_RASTER_SCREEN, TYPE_PRINTER, TYPE_IMAGE_BUFFER

getIDstring

public abstract String getIDstring()

Returns an identification string for the device. This can be vendor-specific, and may be useful for debugging.

Returns:

the identification

getConfigurations

public abstract GraphicsConfiguration[] getConfigurations()

Return all configurations valid for this device.

Returns:

an array of configurations

getDefaultConfiguration

public abstract GraphicsConfiguration getDefaultConfiguration()

Return the default configuration for this device.

Returns:

the default configuration

getBestConfiguration

public GraphicsConfiguration getBestConfiguration(GraphicsConfigTemplate template)

Return the best configuration, according to the criteria in the given template.

Parameters:

template - the template to adjust by

Returns:

the best configuration

Throws:

NullPointerException - if template is null

isFullScreenSupported

public boolean isFullScreenSupported()

Returns true if the device supports full-screen exclusive mode. The default implementation returns true; subclass it if this is not the case.

Returns:

true if full screen support is available

Since:

1.4

setFullScreenWindow

public void setFullScreenWindow(Window w)

Toggle the given window between full screen and normal mode. The previous full-screen window, if different, is restored; if the given window is null, no window will be full screen. If isFullScreenSupported() returns true, full screen mode is considered to be exclusive, which implies:

• Windows cannot overlap the full-screen window. All other application windows will always appear beneath the full-screen window in the Z-order.
• Input method windows are disabled. It is advisable to call Component.enableInputMethods(false) to make a component a non-client of the input method framework.

If isFullScreenSupported() returns false, full-screen exclusive mode is simulated by resizing the window to the size of the screen and positioning it at (0,0). This is also what this method does. If a device supports real fullscreen mode then it should override this method as well as #isFullScreenSupported and #getFullScreenWindow.

Parameters:

w - the window to toggle

Since:

1.4

See Also:

isFullScreenSupported(), getFullScreenWindow(), setDisplayMode(DisplayMode), Component.enableInputMethods(boolean)

getFullScreenWindow

public Window getFullScreenWindow()

Returns the current full-screen window of the device, or null if no window is full-screen.

Returns:

the full-screen window

Since:

1.4

See Also:

setFullScreenWindow(Window)

isDisplayChangeSupported

public boolean isDisplayChangeSupported()

Returns whether this device supports low-level display changes. This may depend on whether full-screen exclusive mode is available. XXX The default implementation returns false for now.

Returns:

true if display changes are supported

Since:

1.4

See Also:

setDisplayMode(DisplayMode)

setDisplayMode

public void setDisplayMode(DisplayMode mode)

Sets the display mode. This may be dependent on the availability of full-screen exclusive mode.

Parameters:

mode - the new mode

Throws:

IllegalArgumentException - if the new mode is not in getDisplayModes

UnsupportedOperationException - if ! isDisplayChangeSupported()

Since:

1.4

See Also:

getDisplayMode(), getDisplayModes(), isDisplayChangeSupported()

getDisplayMode

public DisplayMode getDisplayMode()

Returns the current display mode of this device, or null if unknown.

Returns:

the current display mode

Since:

1.4

See Also:

setDisplayMode(DisplayMode), getDisplayModes()

getDisplayModes

public DisplayMode[] getDisplayModes()

Return an array of all available display modes. This implementation returns a 0-length array, so subclasses must override this.

Returns:

the array of available modes

Since:

1.4

getAvailableAcceleratedMemory

public int getAvailableAcceleratedMemory()

Return the number of bytes available in accelerated memory on this device. The device may support creation or caching on a first-come, first-served basis, depending on the operating system and driver. Memory may be a finite resource, and because of multi-threading, you are not guaranteed that the result of this method ensures your image will successfully be put in accelerated memory. A negative result means the memory is unlimited. The default implementation assumes no special memory is available, and returns 0.

Returns:

the size of accelerated memory available

See Also:

VolatileImage.flush(), ImageCapabilities.isAccelerated()