HeadlessToolkit

Adds an AWTEventListener to receive all AWTEvents dispatched system-wide that conform to the given eventMask.

First, if there is a security manager, its checkPermission method is called with an AWTPermission("listenToAllAWTEvents") permission. This may result in a SecurityException.

eventMask is a bitmask of event types to receive. It is constructed by bitwise OR-ing together the event masks defined in AWTEvent.

Note: event listener use is not recommended for normal application use, but are intended solely to support special purpose facilities including support for accessibility, event record/playback, and diagnostic tracing. If listener is null, no exception is thrown and no action is performed.

Adds the specified property change listener for the named desktop property. If pcl is null, no exception is thrown and no action is performed.

Emits an audio beep.

Indicates the construction status of a specified image that is being prepared for display.

If the values of the width and height arguments are both -1, this method returns the construction status of a screen representation of the specified image in this toolkit. Otherwise, this method returns the construction status of a scaled representation of the image at the specified width and height.

This method does not cause the image to begin loading. An application must call prepareImage to force the loading of an image.

This method is called by the component's checkImage methods.

Information on the flags returned by this method can be found with the definition of the ImageObserver interface.

Creates this toolkit's implementation of Button using the specified peer interface.

Creates this toolkit's implementation of Canvas using the specified peer interface.

Creates this toolkit's implementation of Checkbox using the specified peer interface.

Creates this toolkit's implementation of CheckboxMenuItem using the specified peer interface.

Creates this toolkit's implementation of Choice using the specified peer interface.

Creates a new custom cursor object. If the image to display is invalid, the cursor will be hidden (made completely transparent), and the hotspot will be set to (0, 0).

Note that multi-frame images are invalid and may cause this method to hang.

Creates this toolkit's implementation of the Desktop using the specified peer interface.

Creates this toolkit's implementation of Dialog using the specified peer interface.

Creates a concrete, platform dependent, subclass of the abstract DragGestureRecognizer class requested, and associates it with the DragSource, Component and DragGestureListener specified. subclasses should override this to provide their own implementation

Creates the peer for a DragSourceContext. Always throws InvalidDndOperationException if GraphicsEnvironment.isHeadless() returns true.

Creates this toolkit's implementation of FileDialog using the specified peer interface.

Creates this toolkit's implementation of Frame using the specified peer interface.

Creates an image which decodes the image stored in the specified byte array, and at the specified offset and length. The data must be in some image format, such as GIF or JPEG, that is supported by this toolkit.

Creates an image which decodes the image stored in the specified byte array.

The data must be in some image format, such as GIF or JPEG, that is supported by this toolkit.

Returns an image which gets pixel data from the specified file. The returned Image is a new object which will not be shared with any other caller of this method or its getImage variant.

This method first checks if there is a security manager installed. If so, the method calls the security manager's checkRead method with the specified file to ensure that the image creation is allowed.

Creates an image with the specified image producer.

Returns an image which gets pixel data from the specified URL. The returned Image is a new object which will not be shared with any other caller of this method or its getImage variant.

This method first checks if there is a security manager installed. If so, the method calls the security manager's checkPermission method with the url.openConnection().getPermission() permission to ensure that the image creation is allowed. For compatibility with pre-1.2 security managers, if the access is denied with FilePermission or SocketPermission, the method throws SecurityException if the corresponding 1.1-style SecurityManager.checkXXX method also denies permission.

Creates this toolkit's implementation of Label using the specified peer interface.

Creates this toolkit's implementation of List using the specified peer interface.

Creates this toolkit's implementation of Menu using the specified peer interface.

Creates this toolkit's implementation of MenuBar using the specified peer interface.

Creates this toolkit's implementation of MenuItem using the specified peer interface.

Creates this toolkit's implementation of Panel using the specified peer interface.

Creates this toolkit's implementation of PopupMenu using the specified peer interface.

Creates this toolkit's implementation of ScrollPane using the specified peer interface.

Creates this toolkit's implementation of Scrollbar using the specified peer interface.

Creates this toolkit's implementation of TextArea using the specified peer interface.

Creates this toolkit's implementation of TextField using the specified peer interface.

Creates this toolkit's implementation of Window using the specified peer interface.

Returns an array of all the AWTEventListeners registered on this toolkit. If there is a security manager, its checkPermission method is called with an AWTPermission("listenToAllAWTEvents") permission. This may result in a SecurityException. Listeners can be returned within AWTEventListenerProxy objects, which also contain the event mask for the given listener. Note that listener objects added multiple times appear only once in the returned array.

Returns the supported cursor dimension which is closest to the desired sizes. Systems which only support a single cursor size will return that size regardless of the desired sizes. Systems which don't support custom cursors will return a dimension of 0, 0.

Note: if an image is used whose dimensions don't match a supported size (as returned by this method), the Toolkit implementation will attempt to resize the image to a supported size. Since converting low-resolution images is difficult, no guarantees are made as to the quality of a cursor image which isn't a supported size. It is therefore recommended that this method be called and an appropriate image used so no image conversion is made.

Determines the color model of this toolkit's screen.

ColorModel is an abstract class that encapsulates the ability to translate between the pixel values of an image and its red, green, blue, and alpha components.

This toolkit method is called by the getColorModel method of the Component class.

Returns the names of the available fonts in this toolkit.

For 1.1, the following font names are deprecated (the replacement name follows):

• TimesRoman (use Serif)
• Helvetica (use SansSerif)
• Courier (use Monospaced)

The ZapfDingbats fontname is also deprecated in 1.1 but the characters are defined in Unicode starting at 0x2700, and as of 1.1 Java supports those characters.

Gets the screen device metrics for rendering of the font.

Creates this toolkit's implementation of Font using the specified peer interface.

Returns an image which gets pixel data from the specified file, whose format can be either GIF, JPEG or PNG. The underlying toolkit attempts to resolve multiple requests with the same filename to the same returned Image.

Since the mechanism required to facilitate this sharing of Image objects may continue to hold onto images that are no longer in use for an indefinite period of time, developers are encouraged to implement their own caching of images by using the createImage variant wherever available. If the image data contained in the specified file changes, the Image object returned from this method may still contain stale information which was loaded from the file after a prior call. Previously loaded image data can be manually discarded by calling the flush method on the returned Image.

This method first checks if there is a security manager installed. If so, the method calls the security manager's checkRead method with the file specified to ensure that the access to the image is allowed.

Returns an image which gets pixel data from the specified URL. The pixel data referenced by the specified URL must be in one of the following formats: GIF, JPEG or PNG. The underlying toolkit attempts to resolve multiple requests with the same URL to the same returned Image.

Since the mechanism required to facilitate this sharing of Image objects may continue to hold onto images that are no longer in use for an indefinite period of time, developers are encouraged to implement their own caching of images by using the createImage variant wherever available. If the image data stored at the specified URL changes, the Image object returned from this method may still contain stale information which was fetched from the URL after a prior call. Previously loaded image data can be manually discarded by calling the flush method on the returned Image.

This method first checks if there is a security manager installed. If so, the method calls the security manager's checkPermission method with the url.openConnection().getPermission() permission to ensure that the access to the image is allowed. For compatibility with pre-1.2 security managers, if the access is denied with FilePermission or SocketPermission, the method throws the SecurityException if the corresponding 1.1-style SecurityManager.checkXXX method also denies permission.

Returns whether the given locking key on the keyboard is currently in its "on" state. Valid key codes are VK_CAPS_LOCK, VK_NUM_LOCK, VK_SCROLL_LOCK, and VK_KANA_LOCK.

Returns the maximum number of colors the Toolkit supports in a custom cursor palette.

Note: if an image is used which has more colors in its palette than the supported maximum, the Toolkit implementation will attempt to flatten the palette to the maximum. Since converting low-resolution images is difficult, no guarantees are made as to the quality of a cursor image which has more colors than the system supports. It is therefore recommended that this method be called and an appropriate image used so no image conversion is made.

Determines which modifier key is the appropriate accelerator key for menu shortcuts.

Menu shortcuts, which are embodied in the MenuShortcut class, are handled by the MenuBar class.

By default, this method returns Event.CTRL_MASK. Toolkit implementations should override this method if the Control key isn't the correct key for accelerators.

Gets a PrintJob object which is the result of initiating a print operation on the toolkit's platform.

Each actual implementation of this method should first check if there is a security manager installed. If there is, the method should call the security manager's checkPrintJobAccess method to ensure initiation of a print operation is allowed. If the default implementation of checkPrintJobAccess is used (that is, that method is not overriden), then this results in a call to the security manager's checkPermission method with a RuntimePermission("queuePrintJob") permission.

Gets a PrintJob object which is the result of initiating a print operation on the toolkit's platform.

Each actual implementation of this method should first check if there is a security manager installed. If there is, the method should call the security manager's checkPrintJobAccess method to ensure initiation of a print operation is allowed. If the default implementation of checkPrintJobAccess is used (that is, that method is not overriden), then this results in a call to the security manager's checkPermission method with a RuntimePermission("queuePrintJob") permission.

Gets the insets of the screen.

Returns the screen resolution in dots-per-inch.

Gets the size of the screen. On systems with multiple displays, the primary display is used. Multi-screen aware display dimensions are available from GraphicsConfiguration and GraphicsDevice.

Gets the singleton instance of the system Clipboard which interfaces with clipboard facilities provided by the native platform. This clipboard enables data transfer between Java programs and native applications which use native clipboard facilities.

In addition to any and all formats specified in the flavormap.properties file, or other file specified by the AWT.DnD.flavorMapFileURL Toolkit property, text returned by the system Clipboard's getTransferData() method is available in the following flavors:

• DataFlavor.stringFlavor
• DataFlavor.plainTextFlavor (deprecated)

Each actual implementation of this method should first check if there is a security manager installed. If there is, the method should call the security manager's checkSystemClipboardAccess method to ensure it's ok to to access the system clipboard. If the default implementation of checkSystemClipboardAccess is used (that is, that method is not overriden), then this results in a call to the security manager's checkPermission method with an AWTPermission("accessClipboard") permission.

Gets the application's or applet's EventQueue instance, without checking access. For security reasons, this can only be called from a Toolkit subclass.

Returns whether the always-on-top mode is supported by this toolkit. To detect whether the always-on-top mode is supported for a particular Window, use isAlwaysOnTopSupported().

Returns whether dynamic layout of Containers on resize is currently active (both set in program , and supported by the underlying operating system and/or window manager). The OS/WM support can be queried using the getDesktopProperty("awt.dynamicLayoutSupported") method.

Returns whether the given modal exclusion type is supported by this toolkit. If an unsupported modal exclusion type property is set on a window, then Dialog.ModalExclusionType.NO_EXCLUDE is used instead.

Returns whether the given modality type is supported by this toolkit. If a dialog with unsupported modality type is created, then Dialog.ModalityType.MODELESS is used instead.

Returns a map of visual attributes for the abstract level description of the given input method highlight, or null if no mapping is found. The style field of the input method highlight is ignored. The map returned is unmodifiable.

Prepares an image for rendering.

If the values of the width and height arguments are both -1, this method prepares the image for rendering on the default screen; otherwise, this method prepares an image for rendering on the default screen at the specified width and height.

The image data is downloaded asynchronously in another thread, and an appropriately scaled screen representation of the image is generated.

This method is called by components prepareImage methods.

Information on the flags returned by this method can be found with the definition of the ImageObserver interface.

Removes an AWTEventListener from receiving dispatched AWTEvents.

First, if there is a security manager, its checkPermission method is called with an AWTPermission("listenToAllAWTEvents") permission. This may result in a SecurityException.

Note: event listener use is not recommended for normal application use, but are intended solely to support special purpose facilities including support for accessibility, event record/playback, and diagnostic tracing. If listener is null, no exception is thrown and no action is performed.

Removes the specified property change listener for the named desktop property. If pcl is null, no exception is thrown and no action is performed.

Controls whether the layout of Containers is validated dynamically during resizing, or statically, after resizing is complete. Note that this feature is supported not on all platforms, and conversely, that this feature cannot be turned off on some platforms. On these platforms where dynamic layout during resizing is not supported (or is always supported), setting this property has no effect. Note that this feature can be set or unset as a property of the operating system or window manager on some platforms. On such platforms, the dynamic resize property must be set at the operating system or window manager level before this method can take effect. This method does not change support or settings of the underlying operating system or window manager. The OS/WM support can be queried using getDesktopProperty("awt.dynamicLayoutSupported") method.

Sets the state of the given locking key on the keyboard. Valid key codes are VK_CAPS_LOCK, VK_NUM_LOCK, VK_SCROLL_LOCK, and VK_KANA_LOCK.

Depending on the platform, setting the state of a locking key may involve event processing and therefore may not be immediately observable through getLockingKeyState.

Synchronizes this toolkit's graphics state. Some window systems may do buffering of graphics events.

This method ensures that the display is up-to-date. It is useful for animation.

Returns whether the layout of Containers is validated dynamically during resizing, or statically, after resizing is complete. Note: this method returns the value that was set programmatically; it does not reflect support at the level of the operating system or window manager for dynamic layout on resizing, or the current operating system or window manager settings. The OS/WM support can be queried using getDesktopProperty("awt.dynamicLayoutSupported").

Fills in the integer array that is supplied as an argument with the current system color values.