Class GraphicsDevice

java.lang.Object
java.awt.GraphicsDevice
public abstract classGraphicsDeviceextendsObject
TheGraphicsDevice 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 ofGraphicsEnvironment. Each graphics device has one or moreGraphicsConfiguration objects associated with it. These objects specify the different configurations in which theGraphicsDevice can be used.

In a multi-screen environment, theGraphicsConfiguration objects can be used to render components on multiple screens. The following code sample demonstrates how to create aJFrame object for eachGraphicsConfiguration on each screen device in theGraphicsEnvironment:

   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.

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  • Field Details

    • TYPE_RASTER_SCREEN

      public static final int TYPE_RASTER_SCREEN
      Device is a raster screen.
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    • TYPE_PRINTER

      public static final int TYPE_PRINTER
      Device is a printer.
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    • 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.
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  • Constructor Details

  • Method Details

    • getType

      public abstract int getType()
      Returns the type of thisGraphicsDevice.
      Returns:
      the type of thisGraphicsDevice, which can either be TYPE_RASTER_SCREEN, TYPE_PRINTER or TYPE_IMAGE_BUFFER.
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    • getIDstring

      public abstract String getIDstring()
      Returns the identification string associated with thisGraphicsDevice.

      A particular program might use more than oneGraphicsDevice in aGraphicsEnvironment. This method returns aString identifying a particularGraphicsDevice in the localGraphicsEnvironment. Although there is no public method to set thisString, a programmer can use theString for debugging purposes. Vendors of the Java Runtime Environment can format the return value of theString. To determine how to interpret the value of theString, contact the vendor of your Java Runtime. To find out who the vendor is, from your program, call thegetProperty method of the System class with "java.vendor".

      Returns:
      aString that is the identification of thisGraphicsDevice.

    • getConfigurations

      public abstract GraphicsConfiguration[] getConfigurations()
      Returns all of theGraphicsConfiguration objects associated with thisGraphicsDevice.
      Returns:
      an array ofGraphicsConfiguration objects that are associated with thisGraphicsDevice.

    • getDefaultConfiguration

      public abstract GraphicsConfiguration getDefaultConfiguration()
      Returns the defaultGraphicsConfiguration associated with thisGraphicsDevice.
      Returns:
      the defaultGraphicsConfiguration of thisGraphicsDevice.

    • getBestConfiguration

      public GraphicsConfiguration getBestConfiguration(GraphicsConfigTemplate gct)
      Returns the "best" configuration possible that passes the criteria defined in theGraphicsConfigTemplate.
      Parameters:
      gct - theGraphicsConfigTemplate object used to obtain a validGraphicsConfiguration
      Returns:
      aGraphicsConfiguration that passes the criteria defined in the specifiedGraphicsConfigTemplate.
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    • isFullScreenSupported

      public boolean isFullScreenSupported()
      Returnstrue if thisGraphicsDevice supports full-screen exclusive mode.
      Returns:
      whether full-screen exclusive mode is available for this graphics device
      Since:
      1.4

    • 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 ifisFullScreenSupported returnstrue.

      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 callComponent.enableInputMethods(false) to make a component a non-client of the input method framework.

      The simulated full-screen mode places and resizes the window to the maximum possible visible area of the screen. However, the native windowing system may modify the requested geometry-related data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

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

      When entering full-screen mode, all the translucency effects are reset for the window. Its shape is set tonull, the opacity value is set to 1.0f, and the background color alpha is set to 255 (completely opaque). These values are not restored when returning to windowed mode.

      It is unspecified and platform-dependent how decorated windows operate in full-screen mode. For this reason, it is recommended to turn off the decorations in aFrame orDialog object by using thesetUndecorated method.

      When returning to windowed mode from an exclusive full-screen window, any display changes made by callingsetDisplayMode 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., aFrame); therefore it is preferable to use aFrame here rather than aWindow.
      Since:
      1.4
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    • getFullScreenWindow

      public Window getFullScreenWindow()
      Returns theWindow object representing the full-screen window if the device is in full-screen mode.
      Returns:
      the full-screen window, ornull if the device is not in full-screen mode.
      Since:
      1.4
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    • isDisplayChangeSupported

      public boolean isDisplayChangeSupported()
      Returnstrue if thisGraphicsDevice supports low-level display changes. On some platforms low-level display changes may only be allowed in full-screen exclusive mode (i.e., ifisFullScreenSupported() returnstrue and the application has already entered full-screen mode usingsetFullScreenWindow(java.awt.Window)).
      Returns:
      whether low-level display changes are supported for this graphics device.
      Since:
      1.4
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    • setDisplayMode

      public void setDisplayMode(DisplayMode dm)
      Sets the display mode of this graphics device. This is only allowed ifisDisplayChangeSupported() returnstrue and may require first entering full-screen exclusive mode usingsetFullScreenWindow(java.awt.Window) providing that full-screen exclusive mode is supported (i.e.,isFullScreenSupported() returnstrue).

      The display mode must be one of the display modes returned bygetDisplayModes(), with one exception: passing a display mode withDisplayMode.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 withDisplayMode.BIT_DEPTH_MULTI for bit depth is only allowed if such mode exists in the list returned bygetDisplayModes().

      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.
      Throws:
      IllegalArgumentException - if theDisplayMode supplied isnull, or is not available in the array returned bygetDisplayModes
      UnsupportedOperationException - ifisDisplayChangeSupported returnsfalse
      Since:
      1.4
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    • getDisplayMode

      public DisplayMode getDisplayMode()
      Returns the current display mode of thisGraphicsDevice. The returned display mode is allowed to have a refresh rateDisplayMode.REFRESH_RATE_UNKNOWN if it is indeterminate. Likewise, the returned display mode is allowed to have a bit depthDisplayMode.BIT_DEPTH_MULTI if it is indeterminate or if multiple bit depths are supported.
      Returns:
      the current display mode of this graphics device.
      Since:
      1.4
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    • getDisplayModes

      public DisplayMode[] getDisplayModes()
      Returns all display modes available for thisGraphicsDevice. The returned display modes are allowed to have a refresh rateDisplayMode.REFRESH_RATE_UNKNOWN if it is indeterminate. Likewise, the returned display modes are allowed to have a bit depthDisplayMode.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.
      Since:
      1.4

    • 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 theImageCapabilities 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.
      Since:
      1.4
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    • isWindowTranslucencySupported

      public boolean isWindowTranslucencySupported(GraphicsDevice.WindowTranslucency translucencyKind)
      Returns whether the given level of translucency is supported by this graphics device.
      Parameters:
      translucencyKind - a kind of translucency support
      Returns:
      whether the given translucency kind is supported
      Since:
      1.7