[Chapter 18] 18.60 java.awt.Toolkit (JDK 1.0)

18.60 java.awt.Toolkit (JDK 1.0)

This abstract class defines methods that, when implemented, create platform-dependent "peers" for each of the java.awt Component types. Java supports its platform-independent GUI interface by implementing a subclass of Toolkit for each platform. Portable programs should never use these methods to create peers directly--they should use the Component classes themselves. A Toolkit object cannot be instantiated directly. Component.getToolkit() returns the Toolkit being used for a particular component.

The Toolkit class defines a few methods that you can use directly: the static method getDefaultToolkit() returns the default Toolkit that is in use. getScreenSize() returns the screen size in pixels, and getScreenResolution() returns the resolution in dots-per-inch. getFontList() returns the names of supported fonts. sync() flushes all pending graphics output, which can be useful for animation. In Java 1.1, getPrintJob(), getSystemClipboard(), and getSystemEventQueue() are also of interest.

public abstract class Toolkit extends Object {
    // Default Constructor: public Toolkit()
    // Class Methods
            public static synchronized Toolkit getDefaultToolkit();
        1.1  protected static Container getNativeContainer(Component c);
        1.1  public static String getProperty(String key, String defaultValue);
    // Public Instance Methods
        1.1  public abstract void beep();
            public abstract int checkImage(Image image, int width, int height, ImageObserver observer);
            public abstract Image createImage(ImageProducer producer);
        1.1  public Image createImage(byte[] imagedata);
        1.1  public abstract Image createImage(byte[] imagedata, int imageoffset, int imagelength);
            public abstract ColorModel getColorModel();
            public abstract String[] getFontList();
            public abstract FontMetrics getFontMetrics(Font font);
            public abstract Image getImage(String filename);
            public abstract Image getImage(URL url);
        1.1  public int getMenuShortcutKeyMask();
        1.1  public abstract PrintJob getPrintJob(Frame frame, String jobtitle, Properties props);
            public abstract int getScreenResolution();
            public abstract Dimension getScreenSize();
        1.1  public abstract Clipboard getSystemClipboard();
        1.1  public final EventQueue getSystemEventQueue();
            public abstract boolean prepareImage(Image image, int width, int height, ImageObserver observer);
            public abstract void sync();
    // Protected Instance Methods
            protected abstract ButtonPeer createButton(Button target);
            protected abstract CanvasPeer createCanvas(Canvas target);
            protected abstract CheckboxPeer createCheckbox(Checkbox target);
            protected abstract CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target);
            protected abstract ChoicePeer createChoice(Choice target);
        1.1  protected LightweightPeer createComponent(Component target);
            protected abstract DialogPeer createDialog(Dialog target);
            protected abstract FileDialogPeer createFileDialog(FileDialog target);
            protected abstract FramePeer createFrame(Frame target);
            protected abstract LabelPeer createLabel(Label target);
            protected abstract ListPeer createList(List target);
            protected abstract MenuPeer createMenu(Menu target);
            protected abstract MenuBarPeer createMenuBar(MenuBar target);
            protected abstract MenuItemPeer createMenuItem(MenuItem target);
            protected abstract PanelPeer createPanel(Panel target);
        1.1  protected abstract PopupMenuPeer createPopupMenu(PopupMenu target);
        1.1  protected abstract ScrollPanePeer createScrollPane(ScrollPane target);
            protected abstract ScrollbarPeer createScrollbar(Scrollbar target);
            protected abstract TextAreaPeer createTextArea(TextArea target);
            protected abstract TextFieldPeer createTextField(TextField target);
            protected abstract WindowPeer createWindow(Window target);
        1.1  protected abstract FontPeer getFontPeer(String name, int style);
        1.1  protected abstract EventQueue getSystemEventQueueImpl();
        1.1  protected void loadSystemColors(int[] systemColors);
}

18.60 java.awt.Toolkit (JDK 1.0)

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