java.awt
class GraphicsDevice

java.lang.Object java.awt.GraphicsDevice

Most common way to construct:

GraphicsEnvironment env = …;

GraphicsDevice device = env.getDefaultScreenDevice();

Based on 25 examples

public abstract class GraphicsDevice
extends Object

The GraphicsDevice class describes the graphics devices that might be available in a particular graphics environment. These include screen and printer devices. Note that there can be many screens and many printers in an instance of {@link GraphicsEnvironment}. Each graphics device has one or more {@link GraphicsConfiguration} objects associated with it. These objects specify the different configurations in which the GraphicsDevice can be used.

In a multi-screen environment, the GraphicsConfiguration objects can be used to render components on multiple screens. The following code sample demonstrates how to create a JFrame object for each GraphicsConfiguration on each screen device in the GraphicsEnvironment:

   GraphicsEnvironment ge = GraphicsEnvironment.
   getLocalGraphicsEnvironment();
   GraphicsDevice[] gs = ge.getScreenDevices();
   for (int j = 0; j < gs.length; j++) { 
      GraphicsDevice gd = gs[j];
      GraphicsConfiguration[] gc =
 	gd.getConfigurations();
      for (int i=0; i < gc.length; i++) {
         JFrame f = new
         JFrame(gs[j].getDefaultConfiguration());
         Canvas c = new Canvas(gc[i]); 
         Rectangle gcBounds = gc[i].getBounds();
         int xoffs = gcBounds.x;
         int yoffs = gcBounds.y;
	   f.getContentPane().add(c);
	   f.setLocation((i*50)+xoffs, (i*60)+yoffs);
         f.show();
      }
   }
 

For more information on full-screen exclusive mode API, see the Full-Screen Exclusive Mode API Tutorial.

TYPE_IMAGE_BUFFER

public static final int TYPE_IMAGE_BUFFER

Device is an image buffer. This buffer can reside in device or system memory but it is not physically viewable by the user.

TYPE_PRINTER

public static final int TYPE_PRINTER

Device is a printer.

TYPE_RASTER_SCREEN

public static final int TYPE_RASTER_SCREEN

Device is a raster screen.

GraphicsDevice

protected GraphicsDevice()

This is an abstract class that cannot be instantiated directly. Instances must be obtained from a suitable factory or query method.

getAvailableAcceleratedMemory

public int getAvailableAcceleratedMemory()

This method returns the number of bytes available in accelerated memory on this device. Some images are created or cached in accelerated memory on a first-come, first-served basis. On some operating systems, this memory is a finite resource. Calling this method and scheduling the creation and flushing of images carefully may enable applications to make the most efficient use of that finite resource.
Note that the number returned is a snapshot of how much memory is available; some images may still have problems being allocated into that memory. For example, depending on operating system, driver, memory configuration, and thread situations, the full extent of the size reported may not be available for a given image. There are further inquiry methods on the {@link ImageCapabilities} object associated with a VolatileImage that can be used to determine whether a particular VolatileImage has been created in accelerated memory.

Returns:

number of bytes available in accelerated memory. A negative return value indicates that the amount of accelerated memory on this GraphicsDevice is indeterminate.

getBestConfiguration

public GraphicsConfiguration getBestConfiguration(GraphicsConfigTemplate gct)

Returns the "best" configuration possible that passes the criteria defined in the {@link GraphicsConfigTemplate}.

Parameters:

gct - the GraphicsConfigTemplate object used to obtain a valid GraphicsConfiguration

Returns:

a GraphicsConfiguration that passes the criteria defined in the specified GraphicsConfigTemplate.

getConfigurations

public abstract GraphicsConfiguration[] getConfigurations()

Returns all of the GraphicsConfiguration objects associated with this GraphicsDevice.

Returns:

an array of GraphicsConfiguration objects that are associated with this GraphicsDevice.

getDefaultConfiguration

public abstract GraphicsConfiguration getDefaultConfiguration()

Returns the default GraphicsConfiguration associated with this GraphicsDevice.

Returns:

the default GraphicsConfiguration of this GraphicsDevice.

getDisplayMode

public DisplayMode getDisplayMode()

Returns the current display mode of this GraphicsDevice. The returned display mode is allowed to have a refresh rate {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate. Likewise, the returned display mode is allowed to have a bit depth {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple bit depths are supported.

Returns:

the current display mode of this graphics device.

getDisplayModes

public DisplayMode[] getDisplayModes()

Returns all display modes available for this GraphicsDevice. The returned display modes are allowed to have a refresh rate {@link DisplayMode#REFRESH_RATE_UNKNOWN} if it is indeterminate. Likewise, the returned display modes are allowed to have a bit depth {@link DisplayMode#BIT_DEPTH_MULTI} if it is indeterminate or if multiple bit depths are supported.

Returns:

all of the display modes available for this graphics device.

getFullScreenWindow

public Window getFullScreenWindow()

Returns the Window object representing the full-screen window if the device is in full-screen mode.

Returns:

the full-screen window, or null if the device is not in full-screen mode.

getIDstring

public abstract String getIDstring()

Returns the identification string associated with this GraphicsDevice.

A particular program might use more than one GraphicsDevice in a GraphicsEnvironment. This method returns a String identifying a particular GraphicsDevice in the local GraphicsEnvironment. Although there is no public method to set this String, a programmer can use the String for debugging purposes. Vendors of the Java^TM Runtime Environment can format the return value of the String. To determine how to interpret the value of the String, contact the vendor of your Java Runtime. To find out who the vendor is, from your program, call the {@link System#getProperty(String) getProperty} method of the System class with "java.vendor".

Returns:

a String that is the identification of this GraphicsDevice.

getType

public abstract int getType()

Returns the type of this GraphicsDevice.

Returns:

the type of this GraphicsDevice, which can either be TYPE_RASTER_SCREEN, TYPE_PRINTER or TYPE_IMAGE_BUFFER.

isDisplayChangeSupported

public boolean isDisplayChangeSupported()

Returns true if this GraphicsDevice supports low-level display changes. On some platforms low-level display changes may only be allowed in full-screen exclusive mode (i.e., if {@link #isFullScreenSupported()} returns {@code true} and the application has already entered full-screen mode using {@link #setFullScreenWindow}).

Returns:

whether low-level display changes are supported for this graphics device.

isFullScreenSupported

public boolean isFullScreenSupported()

Returns true if this GraphicsDevice supports full-screen exclusive mode. If a SecurityManager is installed, its checkPermission method will be called with AWTPermission("fullScreenExclusive"). isFullScreenSupported returns true only if that permission is granted.

Returns:

whether full-screen exclusive mode is available for this graphics device

setDisplayMode

public void setDisplayMode(DisplayMode dm)

Sets the display mode of this graphics device. This is only allowed if {@link #isDisplayChangeSupported()} returns {@code true} and may require first entering full-screen exclusive mode using {@link #setFullScreenWindow} providing that full-screen exclusive mode is supported (i.e., {@link #isFullScreenSupported()} returns {@code true}).

The display mode must be one of the display modes returned by {@link #getDisplayModes()}, with one exception: passing a display mode with {@link DisplayMode#REFRESH_RATE_UNKNOWN} refresh rate will result in selecting a display mode from the list of available display modes with matching width, height and bit depth. However, passing a display mode with {@link DisplayMode#BIT_DEPTH_MULTI} for bit depth is only allowed if such mode exists in the list returned by {@link #getDisplayModes()}.

Example code:

 Frame frame;
 DisplayMode newDisplayMode;
 GraphicsDevice gd;
 // create a Frame, select desired DisplayMode from the list of modes
 // returned by gd.getDisplayModes() ...

 if (gd.isFullScreenSupported()) {
     gd.setFullScreenWindow(frame);
 } else {
    // proceed in non-full-screen mode
    frame.setSize(...);
    frame.setLocation(...);
    frame.setVisible(true);
 }

 if (gd.isDisplayChangeSupported()) {
     gd.setDisplayMode(newDisplayMode);
 }
 

Parameters:

dm - The new display mode of this graphics device.

setFullScreenWindow

public void setFullScreenWindow(Window w)

Enter full-screen mode, or return to windowed mode. The entered full-screen mode may be either exclusive or simulated. Exclusive mode is only available if isFullScreenSupported returns true.

Exclusive mode implies:

• Windows cannot overlap the full-screen window. All other application windows will always appear beneath the full-screen window in the Z-order.
• There can be only one full-screen window on a device at any time, so calling this method while there is an existing full-screen Window will cause the existing full-screen window to return to windowed mode.
• 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.

Simulated full-screen mode resizes the window to the size of the screen and positions it at (0,0).

When entering full-screen mode, if the window to be used as the full-screen window is not visible, this method will make it visible. It will remain visible when returning to windowed mode.

When returning to windowed mode from an exclusive full-screen window, any display changes made by calling setDisplayMode are automatically restored to their original state.

Parameters:

w - a window to use as the full-screen window; null if returning to windowed mode. Some platforms expect the fullscreen window to be a top-level component (i.e., a Frame); therefore it is preferable to use a Frame here rather than a Window.