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JavaTM 2 Platform Std. Ed. v1.6.0

java.awt
Class Toolkit

java.lang.Object
  java.awt.Toolkit

public abstract class Toolkit
extends Object
extends Object

This class is the abstract superclass of all actual implementations of the Abstract Window Toolkit. Subclasses of Toolkit are used to bind the various components to particular native toolkit implementations.

Many GUI operations may be performed asynchronously. This means that if you set the state of a component, and then immediately query the state, the returned value may not yet reflect the requested change. This includes, but is not limited to:

Scrolling to a specified position.
For example, calling ScrollPane.setScrollPosition and then getScrollPosition may return an incorrect value if the original request has not yet been processed.
Moving the focus from one component to another.
For more information, see Timing Focus Transfers, a section in The Swing Tutorial.
Making a top-level container visible.
Calling setVisible(true) on a Window, Frame or Dialog may occur asynchronously.
Setting the size or location of a top-level container.
Calls to setSize, setBounds or setLocation on a Window, Frame or Dialog are forwarded to the underlying window management system and may be ignored or modified. See Window for more information.

Most applications should not call any of the methods in this class directly. The methods defined by Toolkit are the "glue" that joins the platform-independent classes in the java.awt package with their counterparts in java.awt.peer. Some methods defined by Toolkit query the native operating system directly.

Since:: JDK1.0

Field Summary

protected Map<String,Object> desktopProperties


protected PropertyChangeSupport desktopPropsSupport


Constructor Summary

Toolkit()


Method Summary

void addAWTEventListener(AWTEventListener listener, long eventMask)
          Adds an AWTEventListener to receive all AWTEvents dispatched system-wide that conform to the given eventMask.

void addPropertyChangeListener(String name, PropertyChangeListener pcl)
          Adds the specified property change listener for the named desktop property.

abstract void beep()
          Emits an audio beep.

abstract int checkImage(Image image, int width, int height, ImageObserver observer)
          Indicates the construction status of a specified image that is being prepared for display.

protected abstract java.awt.peer.ButtonPeer createButton(Button target)
          Creates this toolkit's implementation of Button using the specified peer interface.

protected abstract java.awt.peer.CanvasPeer createCanvas(Canvas target)
          Creates this toolkit's implementation of Canvas using the specified peer interface.

protected abstract java.awt.peer.CheckboxPeer createCheckbox(Checkbox target)
          Creates this toolkit's implementation of Checkbox using the specified peer interface.

protected abstract java.awt.peer.CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target)
          Creates this toolkit's implementation of CheckboxMenuItem using the specified peer interface.

protected abstract java.awt.peer.ChoicePeer createChoice(Choice target)
          Creates this toolkit's implementation of Choice using the specified peer interface.

protected java.awt.peer.LightweightPeer createComponent(Component target)
          Creates a peer for a component or container.

Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
          Creates a new custom cursor object.

protected abstract java.awt.peer.DesktopPeer createDesktopPeer(Desktop target)
          Creates this toolkit's implementation of the Desktop using the specified peer interface.

protected abstract java.awt.peer.DialogPeer createDialog(Dialog target)
          Creates this toolkit's implementation of Dialog using the specified peer interface.

<T extends DragGestureRecognizer> T createDragGestureRecognizer(Class<T> abstractRecognizerClass, DragSource ds, Component c, int srcActions, DragGestureListener dgl)
          Creates a concrete, platform dependent, subclass of the abstract DragGestureRecognizer class requested, and associates it with the DragSource, Component and DragGestureListener specified.

abstract java.awt.dnd.peer.DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge)
          Creates the peer for a DragSourceContext.

protected abstract java.awt.peer.FileDialogPeer createFileDialog(FileDialog target)
          Creates this toolkit's implementation of FileDialog using the specified peer interface.

protected abstract java.awt.peer.FramePeer createFrame(Frame target)
          Creates this toolkit's implementation of Frame using the specified peer interface.

Image createImage(byte[] imagedata)
          Creates an image which decodes the image stored in the specified byte array.

abstract Image createImage(byte[] imagedata, int imageoffset, int imagelength)
          Creates an image which decodes the image stored in the specified byte array, and at the specified offset and length.

abstract Image createImage(ImageProducer producer)
          Creates an image with the specified image producer.

abstract Image createImage(String filename)
          Returns an image which gets pixel data from the specified file.

abstract Image createImage(URL url)
          Returns an image which gets pixel data from the specified URL.

protected abstract java.awt.peer.LabelPeer createLabel(Label target)
          Creates this toolkit's implementation of Label using the specified peer interface.

protected abstract java.awt.peer.ListPeer createList(List target)
          Creates this toolkit's implementation of List using the specified peer interface.

protected abstract java.awt.peer.MenuPeer createMenu(Menu target)
          Creates this toolkit's implementation of Menu using the specified peer interface.

protected abstract java.awt.peer.MenuBarPeer createMenuBar(MenuBar target)
          Creates this toolkit's implementation of MenuBar using the specified peer interface.

protected abstract java.awt.peer.MenuItemPeer createMenuItem(MenuItem target)
          Creates this toolkit's implementation of MenuItem using the specified peer interface.

protected abstract java.awt.peer.PanelPeer createPanel(Panel target)
          Creates this toolkit's implementation of Panel using the specified peer interface.

protected abstract java.awt.peer.PopupMenuPeer createPopupMenu(PopupMenu target)
          Creates this toolkit's implementation of PopupMenu using the specified peer interface.

protected abstract java.awt.peer.ScrollbarPeer createScrollbar(Scrollbar target)
          Creates this toolkit's implementation of Scrollbar using the specified peer interface.

protected abstract java.awt.peer.ScrollPanePeer createScrollPane(ScrollPane target)
          Creates this toolkit's implementation of ScrollPane using the specified peer interface.

protected abstract java.awt.peer.TextAreaPeer createTextArea(TextArea target)
          Creates this toolkit's implementation of TextArea using the specified peer interface.

protected abstract java.awt.peer.TextFieldPeer createTextField(TextField target)
          Creates this toolkit's implementation of TextField using the specified peer interface.

protected abstract java.awt.peer.WindowPeer createWindow(Window target)
          Creates this toolkit's implementation of Window using the specified peer interface.

AWTEventListener[] getAWTEventListeners()
          Returns an array of all the AWTEventListeners registered on this toolkit.

AWTEventListener[] getAWTEventListeners(long eventMask)
          Returns an array of all the AWTEventListeners registered on this toolkit which listen to all of the event types specified in the eventMask argument.

Dimension getBestCursorSize(int preferredWidth, int preferredHeight)
          Returns the supported cursor dimension which is closest to the desired sizes.

abstract ColorModel getColorModel()
          Determines the color model of this toolkit's screen.

static Toolkit getDefaultToolkit()
          Gets the default toolkit.

Object getDesktopProperty(String propertyName)
          Obtains a value for the specified desktop property.

abstract String[] getFontList()
          Deprecated. see GraphicsEnvironment.getAvailableFontFamilyNames()

abstract FontMetrics getFontMetrics(Font font)
          Deprecated. As of JDK version 1.2, replaced by the Font method getLineMetrics.

protected abstract java.awt.peer.FontPeer getFontPeer(String name, int style)
          Deprecated. see java.awt.GraphicsEnvironment#getAllFonts

abstract Image getImage(String filename)
          Returns an image which gets pixel data from the specified file, whose format can be either GIF, JPEG or PNG.

abstract Image getImage(URL url)
          Returns an image which gets pixel data from the specified URL.

boolean getLockingKeyState(int keyCode)
          Returns whether the given locking key on the keyboard is currently in its "on" state.

int getMaximumCursorColors()
          Returns the maximum number of colors the Toolkit supports in a custom cursor palette.

int getMenuShortcutKeyMask()
          Determines which modifier key is the appropriate accelerator key for menu shortcuts.

protected java.awt.peer.MouseInfoPeer getMouseInfoPeer()
          Obtains this toolkit's implementation of helper class for MouseInfo operations.

protected static Container getNativeContainer(Component c)
          Give native peers the ability to query the native container given a native component (eg the direct parent may be lightweight).

PrintJob getPrintJob(Frame frame, String jobtitle, JobAttributes jobAttributes, PageAttributes pageAttributes)
          Gets a PrintJob object which is the result of initiating a print operation on the toolkit's platform.

abstract PrintJob getPrintJob(Frame frame, String jobtitle, Properties props)
          Gets a PrintJob object which is the result of initiating a print operation on the toolkit's platform.

static String getProperty(String key, String defaultValue)
          Gets a property with the specified key and default.

PropertyChangeListener[] getPropertyChangeListeners()
          Returns an array of all the property change listeners registered on this toolkit.

PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
          Returns an array of all the PropertyChangeListeners associated with the named property.

Insets getScreenInsets(GraphicsConfiguration gc)
          Gets the insets of the screen.

abstract int getScreenResolution()
          Returns the screen resolution in dots-per-inch.

abstract Dimension getScreenSize()
          Gets the size of the screen.

abstract Clipboard getSystemClipboard()
          Gets the singleton instance of the system Clipboard which interfaces with clipboard facilities provided by the native platform.

EventQueue getSystemEventQueue()
          Get the application's or applet's EventQueue instance.

protected abstract EventQueue getSystemEventQueueImpl()
          Gets the application's or applet's EventQueue instance, without checking access.

Clipboard getSystemSelection()
          Gets the singleton instance of the system selection as a Clipboard object.

protected void initializeDesktopProperties()
          initializeDesktopProperties

boolean isAlwaysOnTopSupported()
          Returns whether the always-on-top mode is supported by this toolkit.

boolean isDynamicLayoutActive()
          Returns whether dynamic layout of Containers on resize is currently active (both set programmatically, and supported by the underlying operating system and/or window manager).

protected boolean isDynamicLayoutSet()
          Returns whether the layout of Containers is validated dynamically during resizing, or statically, after resizing is complete.

boolean isFrameStateSupported(int state)
          Returns whether Toolkit supports this state for Frames.

abstract boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType modalExclusionType)
          Returns whether the given modal exclusion type is supported by this toolkit.

abstract boolean isModalityTypeSupported(Dialog.ModalityType modalityType)
          Returns whether the given modality type is supported by this toolkit.

protected Object lazilyLoadDesktopProperty(String name)
          an opportunity to lazily evaluate desktop property values.

protected void loadSystemColors(int[] systemColors)
          Fills in the integer array that is supplied as an argument with the current system color values.

abstract Map<TextAttribute,?> mapInputMethodHighlight(InputMethodHighlight highlight)
          Returns a map of visual attributes for the abstract level description of the given input method highlight, or null if no mapping is found.

abstract boolean prepareImage(Image image, int width, int height, ImageObserver observer)
          Prepares an image for rendering.

void removeAWTEventListener(AWTEventListener listener)
          Removes an AWTEventListener from receiving dispatched AWTEvents.

void removePropertyChangeListener(String name, PropertyChangeListener pcl)
          Removes the specified property change listener for the named desktop property.

protected void setDesktopProperty(String name, Object newValue)
          Sets the named desktop property to the specified value and fires a property change event to notify any listeners that the value has changed.

void setDynamicLayout(boolean dynamic)
          Controls whether the layout of Containers is validated dynamically during resizing, or statically, after resizing is complete.

void setLockingKeyState(int keyCode, boolean on)
          Sets the state of the given locking key on the keyboard.

abstract void sync()
          Synchronizes this toolkit's graphics state.

Methods inherited from class java.lang.Object

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

Field Detail

desktopProperties

protected final Map<String,Object> desktopProperties

desktopPropsSupport

protected final PropertyChangeSupport desktopPropsSupport

Constructor Detail

Toolkit

public Toolkit()

Method Detail

createDesktopPeer

protected abstract java.awt.peer.DesktopPeer createDesktopPeer(Desktop target)
                                                        throws HeadlessException

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

Parameters:: target - the desktop to be implemented
Returns:: this toolkit's implementation of the Desktop
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.6
See Also:: GraphicsEnvironment.isHeadless(), Desktop, DesktopPeer

createButton

protected abstract java.awt.peer.ButtonPeer createButton(Button target)
                                                  throws HeadlessException

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

Parameters:: target - the button to be implemented.
Returns:: this toolkit's implementation of Button.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Button, ButtonPeer

createTextField

protected abstract java.awt.peer.TextFieldPeer createTextField(TextField target)
                                                        throws HeadlessException

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

Parameters:: target - the text field to be implemented.
Returns:: this toolkit's implementation of TextField.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), TextField, TextFieldPeer

createLabel

protected abstract java.awt.peer.LabelPeer createLabel(Label target)
                                                throws HeadlessException

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

Parameters:: target - the label to be implemented.
Returns:: this toolkit's implementation of Label.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Label, LabelPeer

createList

protected abstract java.awt.peer.ListPeer createList(List target)
                                              throws HeadlessException

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

Parameters:: target - the list to be implemented.
Returns:: this toolkit's implementation of List.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), List, ListPeer

createCheckbox

protected abstract java.awt.peer.CheckboxPeer createCheckbox(Checkbox target)
                                                      throws HeadlessException

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

Parameters:: target - the check box to be implemented.
Returns:: this toolkit's implementation of Checkbox.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Checkbox, CheckboxPeer

createScrollbar

protected abstract java.awt.peer.ScrollbarPeer createScrollbar(Scrollbar target)
                                                        throws HeadlessException

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

Parameters:: target - the scroll bar to be implemented.
Returns:: this toolkit's implementation of Scrollbar.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Scrollbar, ScrollbarPeer

createScrollPane

protected abstract java.awt.peer.ScrollPanePeer createScrollPane(ScrollPane target)
                                                          throws HeadlessException

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

Parameters:: target - the scroll pane to be implemented.
Returns:: this toolkit's implementation of ScrollPane.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: JDK1.1
See Also:: GraphicsEnvironment.isHeadless(), ScrollPane, ScrollPanePeer

createTextArea

protected abstract java.awt.peer.TextAreaPeer createTextArea(TextArea target)
                                                      throws HeadlessException

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

Parameters:: target - the text area to be implemented.
Returns:: this toolkit's implementation of TextArea.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), TextArea, TextAreaPeer

createChoice

protected abstract java.awt.peer.ChoicePeer createChoice(Choice target)
                                                  throws HeadlessException

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

Parameters:: target - the choice to be implemented.
Returns:: this toolkit's implementation of Choice.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Choice, ChoicePeer

createFrame

protected abstract java.awt.peer.FramePeer createFrame(Frame target)
                                                throws HeadlessException

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

Parameters:: target - the frame to be implemented.
Returns:: this toolkit's implementation of Frame.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Frame, FramePeer

createCanvas

protected abstract java.awt.peer.CanvasPeer createCanvas(Canvas target)

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

Parameters:: target - the canvas to be implemented.
Returns:: this toolkit's implementation of Canvas.
See Also:: Canvas, CanvasPeer

createPanel

protected abstract java.awt.peer.PanelPeer createPanel(Panel target)

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

Parameters:: target - the panel to be implemented.
Returns:: this toolkit's implementation of Panel.
See Also:: Panel, PanelPeer

createWindow

protected abstract java.awt.peer.WindowPeer createWindow(Window target)
                                                  throws HeadlessException

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

Parameters:: target - the window to be implemented.
Returns:: this toolkit's implementation of Window.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Window, WindowPeer

createDialog

protected abstract java.awt.peer.DialogPeer createDialog(Dialog target)
                                                  throws HeadlessException

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

Parameters:: target - the dialog to be implemented.
Returns:: this toolkit's implementation of Dialog.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Dialog, DialogPeer

createMenuBar

protected abstract java.awt.peer.MenuBarPeer createMenuBar(MenuBar target)
                                                    throws HeadlessException

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

Parameters:: target - the menu bar to be implemented.
Returns:: this toolkit's implementation of MenuBar.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), MenuBar, MenuBarPeer

createMenu

protected abstract java.awt.peer.MenuPeer createMenu(Menu target)
                                              throws HeadlessException

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

Parameters:: target - the menu to be implemented.
Returns:: this toolkit's implementation of Menu.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), Menu, MenuPeer

createPopupMenu

protected abstract java.awt.peer.PopupMenuPeer createPopupMenu(PopupMenu target)
                                                        throws HeadlessException

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

Parameters:: target - the popup menu to be implemented.
Returns:: this toolkit's implementation of PopupMenu.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: JDK1.1
See Also:: GraphicsEnvironment.isHeadless(), PopupMenu, PopupMenuPeer

createMenuItem

protected abstract java.awt.peer.MenuItemPeer createMenuItem(MenuItem target)
                                                      throws HeadlessException

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

Parameters:: target - the menu item to be implemented.
Returns:: this toolkit's implementation of MenuItem.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), MenuItem, MenuItemPeer

createFileDialog

protected abstract java.awt.peer.FileDialogPeer createFileDialog(FileDialog target)
                                                          throws HeadlessException

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

Parameters:: target - the file dialog to be implemented.
Returns:: this toolkit's implementation of FileDialog.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), FileDialog, FileDialogPeer

createCheckboxMenuItem

protected abstract java.awt.peer.CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target)
                                                                      throws HeadlessException

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

Parameters:: target - the checkbox menu item to be implemented.
Returns:: this toolkit's implementation of CheckboxMenuItem.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), CheckboxMenuItem, CheckboxMenuItemPeer

getMouseInfoPeer

protected java.awt.peer.MouseInfoPeer getMouseInfoPeer()

Obtains this toolkit's implementation of helper class for MouseInfo operations.

Returns:: this toolkit's implementation of helper for MouseInfo
Throws:: UnsupportedOperationException - if this operation is not implemented
Since:: 1.5
See Also:: MouseInfoPeer, MouseInfo

createComponent

protected java.awt.peer.LightweightPeer createComponent(Component target)

Creates a peer for a component or container. This peer is windowless and allows the Component and Container classes to be extended directly to create windowless components that are defined entirely in java.

Parameters:: target - The Component to be created.

getFontPeer

@Deprecated
protected abstract java.awt.peer.FontPeer getFontPeer(String name,
                                                                 int style)

Deprecated. see java.awt.GraphicsEnvironment#getAllFonts

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

Parameters:: name - the font to be implemented; style - the style of the font, such as PLAIN, BOLD, ITALIC, or a combination
Returns:: this toolkit's implementation of Font
See Also:: Font, FontPeer, GraphicsEnvironment.getAllFonts()

loadSystemColors

protected void loadSystemColors(int[] systemColors)
                         throws HeadlessException

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

Parameters:: systemColors - an integer array.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: JDK1.1
See Also:: GraphicsEnvironment.isHeadless()

setDynamicLayout

public void setDynamicLayout(boolean dynamic)
                      throws HeadlessException

Controls whether the layout of Containers is validated dynamically during resizing, or statically, after resizing is complete. Note that this feature is not supported on all platforms, and conversely, that this feature cannot be turned off on some platforms. On platforms where dynamic layout during resize 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 the underlying operating system or window manager support or settings. The OS/WM support can be queried using getDesktopProperty("awt.dynamicLayoutSupported").

Parameters:: dynamic - If true, Containers should re-layout their components as the Container is being resized. If false, the layout will be validated after resizing is finished.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.4
See Also:: isDynamicLayoutSet(), isDynamicLayoutActive(), getDesktopProperty(String propertyName), GraphicsEnvironment.isHeadless()

isDynamicLayoutSet

protected boolean isDynamicLayoutSet()
                              throws HeadlessException

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").

Returns:: true if validation of Containers is done dynamically, false if validation is done after resizing is finished.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.4
See Also:: setDynamicLayout(boolean dynamic), isDynamicLayoutActive(), getDesktopProperty(String propertyName), GraphicsEnvironment.isHeadless()

isDynamicLayoutActive

public boolean isDynamicLayoutActive()
                              throws HeadlessException

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

Returns:: true if dynamic layout of Containers on resize is currently active, false otherwise.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.4
See Also:: setDynamicLayout(boolean dynamic), isDynamicLayoutSet(), getDesktopProperty(String propertyName), GraphicsEnvironment.isHeadless()

getScreenSize

public abstract Dimension getScreenSize()
                                 throws HeadlessException

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.

Returns:: the size of this toolkit's screen, in pixels.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsConfiguration.getBounds(), GraphicsDevice.getDisplayMode(), GraphicsEnvironment.isHeadless()

getScreenResolution

public abstract int getScreenResolution()
                                 throws HeadlessException

Returns the screen resolution in dots-per-inch.

Returns:: this toolkit's screen resolution, in dots-per-inch.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless()

getScreenInsets

public Insets getScreenInsets(GraphicsConfiguration gc)
                       throws HeadlessException

Gets the insets of the screen.

Parameters:: gc - a GraphicsConfiguration
Returns:: the insets of this toolkit's screen, in pixels.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.4
See Also:: GraphicsEnvironment.isHeadless()

getColorModel

public abstract ColorModel getColorModel()
                                  throws HeadlessException

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 color model of this toolkit's screen.
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
See Also:: GraphicsEnvironment.isHeadless(), ColorModel, Component.getColorModel()

getFontList

@Deprecated
public abstract String[] getFontList()

Deprecated. see GraphicsEnvironment.getAvailableFontFamilyNames()

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.

Returns:: the names of the available fonts in this toolkit.
See Also:: GraphicsEnvironment.getAvailableFontFamilyNames()

getFontMetrics

@Deprecated
public abstract FontMetrics getFontMetrics(Font font)

Deprecated. As of JDK version 1.2, replaced by the Font method getLineMetrics.

Gets the screen device metrics for rendering of the font.

Parameters:: font - a font
Returns:: the screen metrics of the specified font in this toolkit
See Also:: LineMetrics, Font.getLineMetrics(java.lang.String, java.awt.font.FontRenderContext), GraphicsEnvironment.getScreenDevices()

sync

public abstract void sync()

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.

getDefaultToolkit

public static Toolkit getDefaultToolkit()

Gets the default toolkit.

If a system property named "java.awt.headless" is set to true then the headless implementation of Toolkit is used.

If there is no "java.awt.headless" or it is set to false and there is a system property named "awt.toolkit", that property is treated as the name of a class that is a subclass of Toolkit; otherwise the default platform-specific implementation of Toolkit is used.

Also loads additional classes into the VM, using the property 'assistive_technologies' specified in the Sun reference implementation by a line in the 'accessibility.properties' file. The form is "assistive_technologies=..." where the "..." is a comma-separated list of assistive technology classes to load. Each class is loaded in the order given and a single instance of each is created using Class.forName(class).newInstance(). This is done just after the AWT toolkit is created. All errors are handled via an AWTError exception.

Returns:: the default toolkit.
Throws:: AWTError - if a toolkit could not be found, or if one could not be accessed or instantiated.

getImage

public abstract Image getImage(String filename)

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.

Parameters:: filename - the name of a file containing pixel data in a recognized file format.
Returns:: an image which gets its pixel data from the specified file.
Throws:: SecurityException - if a security manager exists and its checkRead method doesn't allow the operation.
See Also:: createImage(java.lang.String)

getImage

public abstract Image getImage(URL url)

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.

Parameters:: url - the URL to use in fetching the pixel data.
Returns:: an image which gets its pixel data from the specified URL.
Throws:: SecurityException - if a security manager exists and its checkPermission method doesn't allow the operation.
See Also:: createImage(java.net.URL)

createImage

public abstract Image createImage(String filename)

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.

Parameters:: filename - the name of a file containing pixel data in a recognized file format.
Returns:: an image which gets its pixel data from the specified file.
Throws:: SecurityException - if a security manager exists and its checkRead method doesn't allow the operation.
See Also:: getImage(java.lang.String)

createImage

public abstract

java.awt Class Toolkit

desktopProperties

desktopPropsSupport

Toolkit

createDesktopPeer

createButton

createTextField

createLabel

createList

createCheckbox

createScrollbar

createScrollPane

createTextArea

createChoice

createFrame

createCanvas

createPanel

createWindow

createDialog

createMenuBar

createMenu

createPopupMenu

createMenuItem

createFileDialog

createCheckboxMenuItem

getMouseInfoPeer

createComponent

getFontPeer

loadSystemColors

setDynamicLayout

isDynamicLayoutSet

isDynamicLayoutActive

getScreenSize

getScreenResolution

getScreenInsets

getColorModel

getFontList

getFontMetrics

sync

getDefaultToolkit

getImage

getImage

createImage

createImage

java.awt
Class Toolkit