Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see {@link java.beans.XMLEncoder}. 

 public JComponent() 
{
        super();
        // We enable key events on all JComponents so that accessibility
        // bindings will work everywhere. This is a partial fix to BugID
        // 4282211.
        enableEvents(AWTEvent.KEY_EVENT_MASK);
        if (isManagingFocus()) {
            LookAndFeel.installProperty(this,
                                        "focusTraversalKeysForward",
                                  getManagingFocusForwardTraversalKeys());
            LookAndFeel.installProperty(this,
                                        "focusTraversalKeysBackward",
                                  getManagingFocusBackwardTraversalKeys());
        }
        super.setLocale( JComponent.getDefaultLocale() );
}

Default JComponent constructor. This constructor does very little initialization beyond calling the Container constructor. For example, the initial layout manager is null. It does, however, set the component's locale property to the value returned by JComponent.getDefaultLocale.

Also see:

getDefaultLocale

  void _paintImmediately(int x,
    int y,
    int w,
    int h) 
{
        Graphics g;
        Container c;
        Rectangle b;
        int tmpX, tmpY, tmpWidth, tmpHeight;
        int offsetX=0,offsetY=0;
        boolean hasBuffer = false;
        JComponent bufferedComponent = null;
        JComponent paintingComponent = this;
        RepaintManager repaintManager = RepaintManager.currentManager(this);
        // parent Container's up to Window or Applet. First container is
        // the direct parent. Note that in testing it was faster to
        // alloc a new Vector vs keeping a stack of them around, and gc
        // seemed to have a minimal effect on this.
        java.util.List< Component > path = new java.util.ArrayList< Component >(7);
        int pIndex = -1;
        int pCount = 0;
        tmpX = tmpY = tmpWidth = tmpHeight = 0;
        Rectangle paintImmediatelyClip = fetchRectangle();
        paintImmediatelyClip.x = x;
        paintImmediatelyClip.y = y;
        paintImmediatelyClip.width = w;
        paintImmediatelyClip.height = h;
        // System.out.println("1) ************* in _paintImmediately for " + this);
        boolean ontop = alwaysOnTop() && isOpaque();
        if (ontop) {
            SwingUtilities.computeIntersection(0, 0, getWidth(), getHeight(),
                                               paintImmediatelyClip);
            if (paintImmediatelyClip.width == 0) {
                recycleRectangle(paintImmediatelyClip);
                return;
            }
        }
        Component child;
        for (c = this, child = null;
             c != null && !(c instanceof Window) && !(c instanceof Applet);
             child = c, c = c.getParent()) {
                JComponent jc = (c instanceof JComponent) ? (JComponent)c :
                                null;
                path.add(c);
                if(!ontop && jc != null && !jc.isOptimizedDrawingEnabled()) {
                    boolean resetPC;
                    // Children of c may overlap, three possible cases for the
                    // painting region:
                    // . Completely obscured by an opaque sibling, in which
                    //   case there is no need to paint.
                    // . Partially obscured by a sibling: need to start
                    //   painting from c.
                    // . Otherwise we aren't obscured and thus don't need to
                    //   start painting from parent.
                    if (c != this) {
                        if (jc.isPaintingOrigin()) {
                            resetPC = true;
                        }
                        else {
                            Component[] children = c.getComponents();
                            int i = 0;
                            for (; i< children.length; i++) {
                                if (children[i] == child) break;
                            }
                            switch (jc.getObscuredState(i,
                                            paintImmediatelyClip.x,
                                            paintImmediatelyClip.y,
                                            paintImmediatelyClip.width,
                                            paintImmediatelyClip.height)) {
                            case NOT_OBSCURED:
                                resetPC = false;
                                break;
                            case COMPLETELY_OBSCURED:
                                recycleRectangle(paintImmediatelyClip);
                                return;
                            default:
                                resetPC = true;
                                break;
                            }
                        }
                    }
                    else {
                        resetPC = false;
                    }
                    if (resetPC) {
                        // Get rid of any buffer since we draw from here and
                        // we might draw something larger
                        paintingComponent = jc;
                        pIndex = pCount;
                        offsetX = offsetY = 0;
                        hasBuffer = false;
                    }
                }
                pCount++;
                // look to see if the parent (and therefor this component)
                // is double buffered
                if(repaintManager.isDoubleBufferingEnabled() && jc != null &&
                                  jc.isDoubleBuffered()) {
                    hasBuffer = true;
                    bufferedComponent = jc;
                }
                // if we aren't on top, include the parent's clip
                if (!ontop) {
                    int bx = c.getX();
                    int by = c.getY();
                    tmpWidth = c.getWidth();
                    tmpHeight = c.getHeight();
                    SwingUtilities.computeIntersection(tmpX,tmpY,tmpWidth,tmpHeight,paintImmediatelyClip);
                    paintImmediatelyClip.x += bx;
                    paintImmediatelyClip.y += by;
                    offsetX += bx;
                    offsetY += by;
                }
        }
        // If the clip width or height is negative, don't bother painting
        if(c == null || c.getPeer() == null ||
                        paintImmediatelyClip.width < = 0 ||
                        paintImmediatelyClip.height < = 0) {
            recycleRectangle(paintImmediatelyClip);
            return;
        }
        paintingComponent.setFlag(IS_REPAINTING, true);
        paintImmediatelyClip.x -= offsetX;
        paintImmediatelyClip.y -= offsetY;
        // Notify the Components that are going to be painted of the
        // child component to paint to.
        if(paintingComponent != this) {
            Component comp;
            int i = pIndex;
            for(; i  > 0 ; i--) {
                comp = path.get(i);
                if(comp instanceof JComponent) {
                    ((JComponent)comp).setPaintingChild(path.get(i-1));
                }
            }
        }
        try {
            if ((g = safelyGetGraphics(paintingComponent, c)) != null) {
                try {
                    if (hasBuffer) {
                        RepaintManager rm = RepaintManager.currentManager(
                                bufferedComponent);
                        rm.beginPaint();
                        try {
                            rm.paint(paintingComponent, bufferedComponent, g,
                                    paintImmediatelyClip.x,
                                    paintImmediatelyClip.y,
                                    paintImmediatelyClip.width,
                                    paintImmediatelyClip.height);
                        } finally {
                            rm.endPaint();
                        }
                    } else {
                        g.setClip(paintImmediatelyClip.x, paintImmediatelyClip.y,
                                paintImmediatelyClip.width, paintImmediatelyClip.height);
                        paintingComponent.paint(g);
                    }
                } finally {
                    g.dispose();
                }
            }
        }
        finally {
            // Reset the painting child for the parent components.
            if(paintingComponent != this) {
                Component comp;
                int i = pIndex;
                for(; i  > 0 ; i--) {
                    comp = path.get(i);
                    if(comp instanceof JComponent) {
                        ((JComponent)comp).setPaintingChild(null);
                    }
                }
            }
            paintingComponent.setFlag(IS_REPAINTING, false);
        }
        recycleRectangle(paintImmediatelyClip);
}

 public  void addAncestorListener(AncestorListener listener) 
{
        AncestorNotifier ancestorNotifier = getAncestorNotifier();
        if (ancestorNotifier == null) {
            ancestorNotifier = new AncestorNotifier(this);
            putClientProperty(JComponent_ANCESTOR_NOTIFIER,
                              ancestorNotifier);
        }
        ancestorNotifier.addAncestorListener(listener);
}

Registers listener so that it will receive AncestorEvents when it or any of its ancestors move or are made visible or invisible. Events are also sent when the component or its ancestors are added or removed from the containment hierarchy.

 public  void addNotify() 
{
        super.addNotify();
        firePropertyChange("ancestor", null, getParent());
        registerWithKeyboardManager(false);
        registerNextFocusableComponent();
}

Notifies this component that it now has a parent component. When this method is invoked, the chain of parent components is set up with KeyboardAction event listeners. This method is called by the toolkit internally and should not be called directly by programs.

 public synchronized  void addVetoableChangeListener(VetoableChangeListener listener) 
{
        if (vetoableChangeSupport == null) {
            vetoableChangeSupport = new java.beans.VetoableChangeSupport(this);
        }
        vetoableChangeSupport.addVetoableChangeListener(listener);
}

Adds a VetoableChangeListener to the listener list. The listener is registered for all properties.

 boolean alwaysOnTop() 
{
        return false;
}

Returns whether this component should be guaranteed to be on top. For example, it would make no sense for Menus to pop up under another component, so they would always return true. Most components will want to return false, hence that is the default.

 boolean checkIfChildObscuredBySibling() 
{
        return true;
}

Returns true, which implies that before checking if a child should be painted it is first check that the child is not obscured by another sibling. This is only checked if isOptimizedDrawingEnabled returns false.

  void clientPropertyChanged(Object key,
    Object oldValue,
    Object newValue) 
{

}

  void compWriteObjectNotify() 
{
        byte count = JComponent.getWriteObjCounter(this);
        JComponent.setWriteObjCounter(this, (byte)(count + 1));
        if (count != 0) {
            return;
        }
        uninstallUIAndProperties();
        /* JTableHeader is in a separate package, which prevents it from
         * being able to override this package-private method the way the
         * other components can.  We don't want to make this method protected
         * because it would introduce public-api for a less-than-desirable
         * serialization scheme, so we compromise with this 'instanceof' hack
         * for now.
         */
        if (getToolTipText() != null ||
            this instanceof javax.swing.table.JTableHeader) {
            ToolTipManager.sharedInstance().unregisterComponent(JComponent.this);
        }
}

This is called from Component by way of reflection. Do NOT change the name unless you change the code in Component as well.

  void componentInputMapChanged(ComponentInputMap inputMap) 
{
        InputMap km = getInputMap(WHEN_IN_FOCUSED_WINDOW, false);
        while (km != inputMap && km != null) {
            km = km.getParent();
        }
        if (km != null) {
            registerWithKeyboardManager(false);
        }
}

Invoked from ComponentInputMap when its bindings change. If inputMap is the current windowInputMap (or a parent of the window InputMap) the KeyboardManager is notified of the new bindings.

 public  void computeVisibleRect(Rectangle visibleRect) 
{
        computeVisibleRect(this, visibleRect);
}

Returns the Component's "visible rect rectangle" - the intersection of the visible rectangles for this component and all of its ancestors. The return value is stored in visibleRect.

 static final  void computeVisibleRect(Component c,
    Rectangle visibleRect) 
{
        Container p = c.getParent();
        Rectangle bounds = c.getBounds();
        if (p == null || p instanceof Window || p instanceof Applet) {
            visibleRect.setBounds(0, 0, bounds.width, bounds.height);
        } else {
            computeVisibleRect(p, visibleRect);
            visibleRect.x -= bounds.x;
            visibleRect.y -= bounds.y;
            SwingUtilities.computeIntersection(0,0,bounds.width,bounds.height,visibleRect);
        }
}

Returns the Component's "visible rect rectangle" - the intersection of the visible rectangles for the component c and all of its ancestors. The return value is stored in visibleRect.

 public boolean contains(int x,
    int y) 
{
        return (ui != null) ? ui.contains(this, x, y) : super.contains(x, y);
}

Gives the UI delegate an opportunity to define the precise shape of this component for the sake of mouse processing.

 public JToolTip createToolTip() 
{
        JToolTip tip = new JToolTip();
        tip.setComponent(this);
        return tip;
}

Returns the instance of JToolTip that should be used to display the tooltip. Components typically would not override this method, but it can be used to cause different tooltips to be displayed differently.

 public  void disable() 
{
        if (isEnabled() != false) {
            super.disable();
            if (accessibleContext != null) {
                accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    AccessibleState.ENABLED, null);
            }
        }
}

  void dndDone() 
{

}

Called to indicate to this component that DnD is done. Needed by JTree.

 DropLocation dropLocationForPoint(Point p) 
{
        return null;
}

Calculates a custom drop location for this type of component, representing where a drop at the given point should insert data. null is returned if this component doesn't calculate custom drop locations. In this case, TransferHandler will provide a default DropLocation containing just the point.

 public  void enable() 
{
        if (isEnabled() != true) {
            super.enable();
            if (accessibleContext != null) {
                accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    null, AccessibleState.ENABLED);
            }
        }
}

 public  void firePropertyChange(String propertyName,
    boolean oldValue,
    boolean newValue) 
{
        super.firePropertyChange(propertyName, oldValue, newValue);
}

Support for reporting bound property changes for boolean properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.

 public  void firePropertyChange(String propertyName,
    int oldValue,
    int newValue) 
{
        super.firePropertyChange(propertyName, oldValue, newValue);
}

Support for reporting bound property changes for integer properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.

 public  void firePropertyChange(String propertyName,
    char oldValue,
    char newValue) 
{
        super.firePropertyChange(propertyName, oldValue, newValue);
}

 protected  void fireVetoableChange(String propertyName,
    Object oldValue,
    Object newValue) throws PropertyVetoException 
{
        if (vetoableChangeSupport == null) {
            return;
        }
        vetoableChangeSupport.fireVetoableChange(propertyName, oldValue, newValue);
}

Supports reporting constrained property changes. This method can be called when a constrained property has changed and it will send the appropriate PropertyChangeEvent to any registered VetoableChangeListeners.

 public AccessibleContext getAccessibleContext() 
{
        return accessibleContext;
}

Returns the AccessibleContext associated with this JComponent. The method implemented by this base class returns null. Classes that extend JComponent should implement this method to return the AccessibleContext associated with the subclass.

 public ActionListener getActionForKeyStroke(KeyStroke aKeyStroke) 
{
        ActionMap am = getActionMap(false);
        if (am == null) {
            return null;
        }
        for (int counter = 0; counter <  3; counter++) {
            InputMap inputMap = getInputMap(counter, false);
            if (inputMap != null) {
                Object actionBinding = inputMap.get(aKeyStroke);
                if (actionBinding != null) {
                    Action action = am.get(actionBinding);
                    if (action instanceof ActionStandin) {
                        return ((ActionStandin)action).actionListener;
                    }
                    return action;
                }
            }
        }
        return null;
}

Returns the object that will perform the action registered for a given keystroke.

 public final ActionMap getActionMap() 
{
        return getActionMap(true);
}

Returns the ActionMap used to determine what Action to fire for particular KeyStroke binding. The returned ActionMap, unless otherwise set, will have the ActionMap from the UI set as the parent.

 final ActionMap getActionMap(boolean create) 
{
        if (getFlag(ACTIONMAP_CREATED)) {
            return actionMap;
        }
        // Hasn't been created.
        if (create) {
            ActionMap am = new ActionMap();
            setActionMap(am);
            return am;
        }
        return null;
}

Finds and returns the appropriate ActionMap.

 public float getAlignmentX() 
{
        if (isAlignmentXSet) {
            return alignmentX;
        }
        return super.getAlignmentX();
}

Overrides Container.getAlignmentX to return the vertical alignment.

 public float getAlignmentY() 
{
        if (isAlignmentYSet) {
            return alignmentY;
        }
        return super.getAlignmentY();
}

Overrides Container.getAlignmentY to return the horizontal alignment.

 public AncestorListener[] getAncestorListeners() 
{
        AncestorNotifier ancestorNotifier = getAncestorNotifier();
        if (ancestorNotifier == null) {
            return new AncestorListener[0];
        }
        return ancestorNotifier.getAncestorListeners();
}

Returns an array of all the ancestor listeners registered on this component.

 public boolean getAutoscrolls() 
{
        return autoscrolls;
}

Gets the autoscrolls property.

 public int getBaseline(int width,
    int height) 
{
        // check size.
        super.getBaseline(width, height);
        if (ui != null) {
            return ui.getBaseline(this, width, height);
        }
        return -1;
}

Returns the baseline. The baseline is measured from the top of the component. This method is primarily meant for LayoutManagers to align components along their baseline. A return value less than 0 indicates this component does not have a reasonable baseline and that LayoutManagers should not align this component on its baseline.

This method calls into the ComponentUI method of the same name. If this component does not have a ComponentUI -1 will be returned. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and getBaselineResizeBehavior can be used to determine how the baseline changes with size.

 public BaselineResizeBehavior getBaselineResizeBehavior() 
{
        if (ui != null) {
            return ui.getBaselineResizeBehavior(this);
        }
        return BaselineResizeBehavior.OTHER;
}

Returns an enum indicating how the baseline of the component changes as the size changes. This method is primarily meant for layout managers and GUI builders.

This method calls into the ComponentUI method of the same name. If this component does not have a ComponentUI BaselineResizeBehavior.OTHER will be returned. Subclasses should never return null; if the baseline can not be calculated return BaselineResizeBehavior.OTHER. Callers should first ask for the baseline using getBaseline and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than BaselineResizeBehavior.OTHER even if getBaseline returns a value less than 0.

 public Border getBorder() 
{
        return border;
}

Returns the border of this component or null if no border is currently set.

 public Rectangle getBounds(Rectangle rv) 
{
        if (rv == null) {
            return new Rectangle(getX(), getY(), getWidth(), getHeight());
        }
        else {
            rv.setBounds(getX(), getY(), getWidth(), getHeight());
            return rv;
        }
}

Stores the bounds of this component into "return value" rv and returns rv. If rv is null a new Rectangle is allocated. This version of getBounds is useful if the caller wants to avoid allocating a new Rectangle object on the heap.

 public final Object getClientProperty(Object key) 
{
        if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
            return aaTextInfo;
        } else if (key == SwingUtilities2.COMPONENT_UI_PROPERTY_KEY) {
            return ui;
        }
         if(clientProperties == null) {
            return null;
        } else {
            synchronized(clientProperties) {
                return clientProperties.get(key);
            }
        }
}

Returns the value of the property with the specified key. Only properties added with putClientProperty will return a non-null value.

 protected Graphics getComponentGraphics(Graphics g) 
{
        Graphics componentGraphics = g;
        if (ui != null && DEBUG_GRAPHICS_LOADED) {
            if ((DebugGraphics.debugComponentCount() != 0) &&
                    (shouldDebugGraphics() != 0) &&
                    !(g instanceof DebugGraphics)) {
                componentGraphics = new DebugGraphics(g,this);
            }
        }
        componentGraphics.setColor(getForeground());
        componentGraphics.setFont(getFont());
        return componentGraphics;
}

Returns the graphics object used to paint this component. If DebugGraphics is turned on we create a new DebugGraphics object if necessary. Otherwise we just configure the specified graphics object's foreground and font.

 public JPopupMenu getComponentPopupMenu() 
{
        if(!getInheritsPopupMenu()) {
            return popupMenu;
        }
        if(popupMenu == null) {
            // Search parents for its popup
            Container parent = getParent();
            while (parent != null) {
                if(parent instanceof JComponent) {
                    return ((JComponent)parent).getComponentPopupMenu();
                }
                if(parent instanceof Window ||
                   parent instanceof Applet) {
                    // Reached toplevel, break and return null
                    break;
                }
                parent = parent.getParent();
            }
            return null;
        }
        return popupMenu;
}

Returns JPopupMenu that assigned for this component. If this component does not have a JPopupMenu assigned to it and getInheritsPopupMenu is true, this will return getParent().getComponentPopupMenu() (assuming the parent is valid.)

 public int getConditionForKeyStroke(KeyStroke aKeyStroke) 
{
        for (int counter = 0; counter <  3; counter++) {
            InputMap inputMap = getInputMap(counter, false);
            if (inputMap != null && inputMap.get(aKeyStroke) != null) {
                return counter;
            }
        }
        return UNDEFINED_CONDITION;
}

Returns the condition that determines whether a registered action occurs in response to the specified keystroke.

For Java 2 platform v1.3, a KeyStroke can be associated with more than one condition. For example, 'a' could be bound for the two conditions WHEN_FOCUSED and WHEN_IN_FOCUSED_WINDOW condition.

 boolean getCreatedDoubleBuffer() 
{
        return getFlag(CREATED_DOUBLE_BUFFER);
}

Returns true if the RepaintManager created the double buffer image from the component.

 public int getDebugGraphicsOptions() 
{
        return DebugGraphics.getDebugOptions(this);
}

Returns the state of graphics debugging.

 public static Locale getDefaultLocale() 
{
        Locale l = (Locale) SwingUtilities.appContextGet(defaultLocale);
        if( l == null ) {
            //REMIND(bcb) choosing the default value is more complicated
            //than this.
            l = Locale.getDefault();
            JComponent.setDefaultLocale( l );
        }
        return l;
}

Returns the default locale used to initialize each JComponent's locale property upon creation. The default locale has "AppContext" scope so that applets (and potentially multiple lightweight applications running in a single VM) can have their own setting. An applet can safely alter its default locale because it will have no affect on other applets (or the browser).

 public FontMetrics getFontMetrics(Font font) 
{
        return SwingUtilities2.getFontMetrics(this, font);
}

Gets the FontMetrics for the specified Font.

 public Graphics getGraphics() 
{
        if (DEBUG_GRAPHICS_LOADED && shouldDebugGraphics() != 0) {
            DebugGraphics graphics = new DebugGraphics(super.getGraphics(),
                                                       this);
            return graphics;
        }
        return super.getGraphics();
}

Returns this component's graphics context, which lets you draw on a component. Use this method to get a Graphics object and then invoke operations on that object to draw on the component.

 static  void getGraphicsInvoked(Component root) 
{
        if (!JComponent.isComponentObtainingGraphicsFrom(root)) {
            JRootPane rootPane = ((RootPaneContainer)root).getRootPane();
            if (rootPane != null) {
                rootPane.disableTrueDoubleBuffering();
            }
        }
}

 public int getHeight() 
{
 return super.getHeight();
}

Returns the current height of this component. This method is preferable to writing component.getBounds().height, or component.getSize().height because it doesn't cause any heap allocations.

 public boolean getInheritsPopupMenu() 
{
        return getFlag(INHERITS_POPUP_MENU);
}

Returns true if the JPopupMenu should be inherited from the parent.

 public final InputMap getInputMap() 
{
        return getInputMap(WHEN_FOCUSED, true);
}

Returns the InputMap that is used when the component has focus. This is convenience method for getInputMap(WHEN_FOCUSED).

 public final InputMap getInputMap(int condition) 
{
        return getInputMap(condition, true);
}

Returns the InputMap that is used during condition.

 final InputMap getInputMap(int condition,
    boolean create) 
{
        switch (condition) {
        case WHEN_FOCUSED:
            if (getFlag(FOCUS_INPUTMAP_CREATED)) {
                return focusInputMap;
            }
            // Hasn't been created yet.
            if (create) {
                InputMap km = new InputMap();
                setInputMap(condition, km);
                return km;
            }
            break;
        case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
            if (getFlag(ANCESTOR_INPUTMAP_CREATED)) {
                return ancestorInputMap;
            }
            // Hasn't been created yet.
            if (create) {
                InputMap km = new InputMap();
                setInputMap(condition, km);
                return km;
            }
            break;
        case WHEN_IN_FOCUSED_WINDOW:
            if (getFlag(WIF_INPUTMAP_CREATED)) {
                return windowInputMap;
            }
            // Hasn't been created yet.
            if (create) {
                ComponentInputMap km = new ComponentInputMap(this);
                setInputMap(condition, km);
                return km;
            }
            break;
        default:
            throw new IllegalArgumentException("condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
        }
        return null;
}

Returns the InputMap to use for condition condition. If the InputMap hasn't been created, and create is true, it will be created.

 public InputVerifier getInputVerifier() 
{
        return (InputVerifier)getClientProperty(JComponent_INPUT_VERIFIER);
}

Returns the input verifier for this component.

 public Insets getInsets() 
{
        if (border != null) {
            return border.getBorderInsets(this);
        }
        return super.getInsets();
}

If a border has been set on this component, returns the border's insets; otherwise calls super.getInsets.

 public Insets getInsets(Insets insets) 
{
        if (insets == null) {
            insets = new Insets(0, 0, 0, 0);
        }
        if (border != null) {
            if (border instanceof AbstractBorder) {
                return ((AbstractBorder)border).getBorderInsets(this, insets);
            } else {
                // Can't reuse border insets because the Border interface
                // can't be enhanced.
                return border.getBorderInsets(this);
            }
        } else {
            // super.getInsets() always returns an Insets object with
            // all of its value zeroed.  No need for a new object here.
            insets.left = insets.top = insets.right = insets.bottom = 0;
            return insets;
        }
}

Returns an Insets object containing this component's inset values. The passed-in Insets object will be reused if possible. Calling methods cannot assume that the same object will be returned, however. All existing values within this object are overwritten. If insets is null, this will allocate a new one.

 public T[] getListeners(Class<T> listenerType) 
{
        T[] result;
        if (listenerType == AncestorListener.class) {
            // AncestorListeners are handled by the AncestorNotifier
            result = (T[])getAncestorListeners();
        }
        else if (listenerType == VetoableChangeListener.class) {
            // VetoableChangeListeners are handled by VetoableChangeSupport
            result = (T[])getVetoableChangeListeners();
        }
        else if (listenerType == PropertyChangeListener.class) {
            // PropertyChangeListeners are handled by PropertyChangeSupport
            result = (T[])getPropertyChangeListeners();
        }
        else {
            result = listenerList.getListeners(listenerType);
        }
        if (result.length == 0) {
            return super.getListeners(listenerType);
        }
        return result;
}

Returns an array of all the objects currently registered as FooListeners upon this JComponent. FooListeners are registered using the addFooListener method.

You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a JComponent c for its mouse listeners with the following code:

MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));

If no such listeners exist, this method returns an empty array.

 public Point getLocation(Point rv) 
{
        if (rv == null) {
            return new Point(getX(), getY());
        }
        else {
            rv.setLocation(getX(), getY());
            return rv;
        }
}

Stores the x,y origin of this component into "return value" rv and returns rv. If rv is null a new Point is allocated. This version of getLocation is useful if the caller wants to avoid allocating a new Point object on the heap.

 static Set<KeyStroke> getManagingFocusBackwardTraversalKeys() 
{
        synchronized(JComponent.class) {
            if (managingFocusBackwardTraversalKeys == null) {
                managingFocusBackwardTraversalKeys = new HashSet< KeyStroke >(1);
                managingFocusBackwardTraversalKeys.add(
                    KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
                                           InputEvent.SHIFT_MASK |
                                           InputEvent.CTRL_MASK));
            }
        }
        return managingFocusBackwardTraversalKeys;
}

Returns the Set of KeyStrokes to use if the component is managing focus for backward focus traversal.

 static Set<KeyStroke> getManagingFocusForwardTraversalKeys() 
{
        synchronized(JComponent.class) {
            if (managingFocusForwardTraversalKeys == null) {
                managingFocusForwardTraversalKeys = new HashSet< KeyStroke >(1);
                managingFocusForwardTraversalKeys.add(
                    KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
                                           InputEvent.CTRL_MASK));
            }
        }
        return managingFocusForwardTraversalKeys;
}

Returns the Set of KeyStrokes to use if the component is managing focus for forward focus traversal.

 public Dimension getMaximumSize() 
{
        if (isMaximumSizeSet()) {
            return super.getMaximumSize();
        }
        Dimension size = null;
        if (ui != null) {
            size = ui.getMaximumSize(this);
        }
        return (size != null) ? size : super.getMaximumSize();
}

If the maximum size has been set to a non-null value just returns it. If the UI delegate's getMaximumSize method returns a non-null value then return that; otherwise defer to the component's layout manager.

 public Dimension getMinimumSize() 
{
        if (isMinimumSizeSet()) {
            return super.getMinimumSize();
        }
        Dimension size = null;
        if (ui != null) {
            size = ui.getMinimumSize(this);
        }
        return (size != null) ? size : super.getMinimumSize();
}

If the minimum size has been set to a non-null value just returns it. If the UI delegate's getMinimumSize method returns a non-null value then return that; otherwise defer to the component's layout manager.

 public Component getNextFocusableComponent() 
{
        return (Component)getClientProperty(NEXT_FOCUS);
}

In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

Returns the Component set by a prior call to setNextFocusableComponent(Component) on this JComponent.

 public Point getPopupLocation(MouseEvent event) 
{
        return null;
}

Returns the preferred location to display the popup menu in this component's coordinate system. It is up to the look and feel to honor this property, some may choose to ignore it. If {@code null}, the look and feel will choose a suitable location.

 public Dimension getPreferredSize() 
{
        if (isPreferredSizeSet()) {
            return super.getPreferredSize();
        }
        Dimension size = null;
        if (ui != null) {
            size = ui.getPreferredSize(this);
        }
        return (size != null) ? size : super.getPreferredSize();
}

If the preferredSize has been set to a non-null value just returns it. If the UI delegate's getPreferredSize method returns a non null value then return that; otherwise defer to the component's layout manager.

 public KeyStroke[] getRegisteredKeyStrokes() 
{
        int[] counts = new int[3];
        KeyStroke[][] strokes = new KeyStroke[3][];
        for (int counter = 0; counter <  3; counter++) {
            InputMap km = getInputMap(counter, false);
            strokes[counter] = (km != null) ? km.allKeys() : null;
            counts[counter] = (strokes[counter] != null) ?
                               strokes[counter].length : 0;
        }
        KeyStroke[] retValue = new KeyStroke[counts[0] + counts[1] +
                                            counts[2]];
        for (int counter = 0, last = 0; counter <  3; counter++) {
            if (counts[counter]  > 0) {
                System.arraycopy(strokes[counter], 0, retValue, last,
                                 counts[counter]);
                last += counts[counter];
            }
        }
        return retValue;
}

Returns the KeyStrokes that will initiate registered actions.

 public JRootPane getRootPane() 
{
        return SwingUtilities.getRootPane(this);
}

Returns the JRootPane ancestor for this component.

 public Dimension getSize(Dimension rv) 
{
        if (rv == null) {
            return new Dimension(getWidth(), getHeight());
        }
        else {
            rv.setSize(getWidth(), getHeight());
            return rv;
        }
}

Stores the width/height of this component into "return value" rv and returns rv. If rv is null a new Dimension object is allocated. This version of getSize is useful if the caller wants to avoid allocating a new Dimension object on the heap.

 public Point getToolTipLocation(MouseEvent event) 
{
        return null;
}

Returns the tooltip location in this component's coordinate system. If null is returned, Swing will choose a location. The default implementation returns null.

 public String getToolTipText() 
{
        return (String)getClientProperty(TOOL_TIP_TEXT_KEY);
}

Returns the tooltip string that has been set with setToolTipText.

 public String getToolTipText(MouseEvent event) 
{
        return getToolTipText();
}

Returns the string to be used as the tooltip for event. By default this returns any string set using setToolTipText. If a component provides more extensive API to support differing tooltips at different locations, this method should be overridden.

 public Container getTopLevelAncestor() 
{
        for(Container p = this; p != null; p = p.getParent()) {
            if(p instanceof Window || p instanceof Applet) {
                return p;
            }
        }
        return null;
}

Returns the top-level ancestor of this component (either the containing Window or Applet), or null if this component has not been added to any container.

 public TransferHandler getTransferHandler() 
{
        return (TransferHandler)getClientProperty(JComponent_TRANSFER_HANDLER);
}

Gets the transferHandler property.

 public String getUIClassID() 
{
        return uiClassID;
}

Returns the UIDefaults key used to look up the name of the swing.plaf.ComponentUI class that defines the look and feel for this component. Most applications will never need to call this method. Subclasses of JComponent that support pluggable look and feel should override this method to return a UIDefaults key that maps to the ComponentUI subclass that defines their look and feel.

 public boolean getVerifyInputWhenFocusTarget() 
{
        return verifyInputWhenFocusTarget;
}

Returns the value that indicates whether the input verifier for the current focus owner will be called before this component requests focus.

 public synchronized VetoableChangeListener[] getVetoableChangeListeners() 
{
        if (vetoableChangeSupport == null) {
            return new VetoableChangeListener[0];
        }
        return vetoableChangeSupport.getVetoableChangeListeners();
}

Returns an array of all the vetoable change listeners registered on this component.

 public Rectangle getVisibleRect() 
{
        Rectangle visibleRect = new Rectangle();
        computeVisibleRect(visibleRect);
        return visibleRect;
}

Returns the Component's "visible rectangle" - the intersection of this component's visible rectangle, new Rectangle(0, 0, getWidth(), getHeight()), and all of its ancestors' visible rectangles.

 public int getWidth() 
{
 return super.getWidth();
}

Returns the current width of this component. This method is preferable to writing component.getBounds().width, or component.getSize().width because it doesn't cause any heap allocations.

 static byte getWriteObjCounter(JComponent comp) 
{
        return (byte)((comp.flags  > > WRITE_OBJ_COUNTER_FIRST) & 0xFF);
}

 public int getX() 
{
 return super.getX();
}

Returns the current x coordinate of the component's origin. This method is preferable to writing component.getBounds().x, or component.getLocation().x because it doesn't cause any heap allocations.

 public int getY() 
{
 return super.getY();
}

Returns the current y coordinate of the component's origin. This method is preferable to writing component.getBounds().y, or component.getLocation().y because it doesn't cause any heap allocations.

 public  void grabFocus() 
{
        requestFocus();
}

Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, visible, and focusable for the request to be granted.

This method is intended for use by focus implementations. Client code should not use this method; instead, it should use requestFocusInWindow().

 public boolean isDoubleBuffered() 
{
        return getFlag(IS_DOUBLE_BUFFERED);
}

Returns whether this component should use a buffer to paint.

 public static boolean isLightweightComponent(Component c) 
{
        return c.getPeer() instanceof LightweightPeer;
}

Returns true if this component is lightweight, that is, if it doesn't have a native window system peer.

 public boolean isManagingFocus() 
{
        return false;
}

In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

Changes this JComponent's focus traversal keys to CTRL+TAB and CTRL+SHIFT+TAB. Also prevents SortingFocusTraversalPolicy from considering descendants of this JComponent when computing a focus traversal cycle.

 public boolean isOpaque() 
{
        return getFlag(IS_OPAQUE);
}

Returns true if this component is completely opaque.

An opaque component paints every pixel within its rectangular bounds. A non-opaque component paints only a subset of its pixels or none at all, allowing the pixels underneath it to "show through". Therefore, a component that does not fully paint its pixels provides a degree of transparency.

Subclasses that guarantee to always completely paint their contents should override this method and return true.

 public boolean isOptimizedDrawingEnabled() 
{
        return true;
}

Returns true if this component tiles its children -- that is, if it can guarantee that the children will not overlap. The repainting system is substantially more efficient in this common case. JComponent subclasses that can't make this guarantee, such as JLayeredPane, should override this method to return false.

 boolean isPainting() 
{
        Container component = this;
        while (component != null) {
            if (component instanceof JComponent &&
                   ((JComponent)component).getFlag(ANCESTOR_USING_BUFFER)) {
                return true;
            }
            component = component.getParent();
        }
        return false;
}

Returns true if this component, or any of its ancestors, are in the processing of painting.

 public final boolean isPaintingForPrint() 
{
        return getFlag(IS_PRINTING);
}

Returns true if the current painting operation on this component is part of a print operation. This method is useful when you want to customize what you print versus what you show on the screen.

You can detect changes in the value of this property by listening for property change events on this component with name "paintingForPrint".

Note: This method provides complimentary functionality to that provided by other high level Swing printing APIs. However, it deals strictly with painting and should not be confused as providing information on higher level print processes. For example, a javax.swing.JTable#print() operation doesn't necessarily result in a continuous rendering of the full component, and the return value of this method can change multiple times during that operation. It is even possible for the component to be painted to the screen while the printing process is ongoing. In such a case, the return value of this method is true when, and only when, the table is being painted as part of the printing process.

 protected boolean isPaintingOrigin() 
{
        return false;
}

Returns {@code true} if a paint triggered on a child component should cause painting to originate from this Component, or one of its ancestors.

Calling #repaint or #paintImmediately(int, int, int, int) on a Swing component will result in calling the JComponent#paintImmediately(int, int, int, int) method of the first ancestor which {@code isPaintingOrigin()} returns {@code true}, if there are any.

{@code JComponent} subclasses that need to be painted when any of their children are repainted should override this method to return {@code true}.

 public boolean isPaintingTile() 
{
        return getFlag(IS_PAINTING_TILE);
}

Returns true if the component is currently painting a tile. If this method returns true, paint will be called again for another tile. This method returns false if you are not painting a tile or if the last tile is painted. Use this method to keep some state you might need between tiles.

 public boolean isRequestFocusEnabled() 
{
        return !getFlag(REQUEST_FOCUS_DISABLED);
}

Returns true if this JComponent should get focus; otherwise returns false.

Please see How to Use the Focus Subsystem, a section in The Java Tutorial, for more information.

 public boolean isValidateRoot() 
{
        return false;
}

If this method returns true, revalidate calls by descendants of this component will cause the entire tree beginning with this root to be validated. Returns false by default. JScrollPane overrides this method and returns true.

 public  void paint(Graphics g) 
{
        boolean shouldClearPaintFlags = false;
        if ((getWidth() < = 0) || (getHeight() < = 0)) {
            return;
        }
        Graphics componentGraphics = getComponentGraphics(g);
        Graphics co = componentGraphics.create();
        try {
            RepaintManager repaintManager = RepaintManager.currentManager(this);
            Rectangle clipRect = co.getClipBounds();
            int clipX;
            int clipY;
            int clipW;
            int clipH;
            if (clipRect == null) {
                clipX = clipY = 0;
                clipW = getWidth();
                clipH = getHeight();
            }
            else {
                clipX = clipRect.x;
                clipY = clipRect.y;
                clipW = clipRect.width;
                clipH = clipRect.height;
            }
            if(clipW  > getWidth()) {
                clipW = getWidth();
            }
            if(clipH  > getHeight()) {
                clipH = getHeight();
            }
            if(getParent() != null && !(getParent() instanceof JComponent)) {
                adjustPaintFlags();
                shouldClearPaintFlags = true;
            }
            int bw,bh;
            boolean printing = getFlag(IS_PRINTING);
            if (!printing && repaintManager.isDoubleBufferingEnabled() &&
                !getFlag(ANCESTOR_USING_BUFFER) && isDoubleBuffered() &&
                (getFlag(IS_REPAINTING) || repaintManager.isPainting()))
            {
                repaintManager.beginPaint();
                try {
                    repaintManager.paint(this, this, co, clipX, clipY, clipW,
                                         clipH);
                } finally {
                    repaintManager.endPaint();
                }
            }
            else {
                // Will ocassionaly happen in 1.2, especially when printing.
                if (clipRect == null) {
                    co.setClip(clipX, clipY, clipW, clipH);
                }
                if (!rectangleIsObscured(clipX,clipY,clipW,clipH)) {
                    if (!printing) {
                        paintComponent(co);
                        paintBorder(co);
                    }
                    else {
                        printComponent(co);
                        printBorder(co);
                    }
                }
                if (!printing) {
                    paintChildren(co);
                }
                else {
                    printChildren(co);
                }
            }
        } finally {
            co.dispose();
            if(shouldClearPaintFlags) {
                setFlag(ANCESTOR_USING_BUFFER,false);
                setFlag(IS_PAINTING_TILE,false);
                setFlag(IS_PRINTING,false);
                setFlag(IS_PRINTING_ALL,false);
            }
        }
}

Invoked by Swing to draw components. Applications should not invoke paint directly, but should instead use the repaint method to schedule the component for redrawing.

This method actually delegates the work of painting to three protected methods: paintComponent, paintBorder, and paintChildren. They're called in the order listed to ensure that children appear on top of component itself. Generally speaking, the component and its children should not paint in the insets area allocated to the border. Subclasses can just override this method, as always. A subclass that just wants to specialize the UI (look and feel) delegate's paint method should just override paintComponent.

 protected  void paintBorder(Graphics g) 
{
        Border border = getBorder();
        if (border != null) {
            border.paintBorder(this, g, 0, 0, getWidth(), getHeight());
        }
}

Paints the component's border.

If you override this in a subclass you should not make permanent changes to the passed in Graphics. For example, you should not alter the clip Rectangle or modify the transform. If you need to do these operations you may find it easier to create a new Graphics from the passed in Graphics and manipulate it.

 protected  void paintChildren(Graphics g) 
{
        Graphics sg = g;
        synchronized(getTreeLock()) {
            int i = getComponentCount() - 1;
            if (i <  0) {
                return;
            }
            // If we are only to paint to a specific child, determine
            // its index.
            if (paintingChild != null &&
                (paintingChild instanceof JComponent) &&
                paintingChild.isOpaque()) {
                for (; i  >= 0; i--) {
                    if (getComponent(i) == paintingChild){
                        break;
                    }
                }
            }
            Rectangle tmpRect = fetchRectangle();
            boolean checkSiblings = (!isOptimizedDrawingEnabled() &&
                                     checkIfChildObscuredBySibling());
            Rectangle clipBounds = null;
            if (checkSiblings) {
                clipBounds = sg.getClipBounds();
                if (clipBounds == null) {
                    clipBounds = new Rectangle(0, 0, getWidth(),
                                               getHeight());
                }
            }
            boolean printing = getFlag(IS_PRINTING);
            final Window window = SwingUtilities.getWindowAncestor(this);
            final boolean isWindowOpaque = window == null || window.isOpaque();
            for (; i  >= 0 ; i--) {
                Component comp = getComponent(i);
                if (comp == null) {
                    continue;
                }
                final boolean isJComponent = comp instanceof JComponent;
                // Enable painting of heavyweights in non-opaque windows.
                // See 6884960
                if ((!isWindowOpaque || isJComponent ||
                            isLightweightComponent(comp)) && comp.isVisible())
                {
                    Rectangle cr;
                    cr = comp.getBounds(tmpRect);
                    boolean hitClip = g.hitClip(cr.x, cr.y, cr.width,
                                                cr.height);
                    if (hitClip) {
                        if (checkSiblings && i  > 0) {
                            int x = cr.x;
                            int y = cr.y;
                            int width = cr.width;
                            int height = cr.height;
                            SwingUtilities.computeIntersection
                                (clipBounds.x, clipBounds.y,
                                 clipBounds.width, clipBounds.height, cr);
                            if(getObscuredState(i, cr.x, cr.y, cr.width,
                                          cr.height) == COMPLETELY_OBSCURED) {
                                continue;
                            }
                            cr.x = x;
                            cr.y = y;
                            cr.width = width;
                            cr.height = height;
                        }
                        Graphics cg = sg.create(cr.x, cr.y, cr.width,
                                                cr.height);
                        cg.setColor(comp.getForeground());
                        cg.setFont(comp.getFont());
                        boolean shouldSetFlagBack = false;
                        try {
                            if(isJComponent) {
                                if(getFlag(ANCESTOR_USING_BUFFER)) {
                                    ((JComponent)comp).setFlag(
                                                 ANCESTOR_USING_BUFFER,true);
                                    shouldSetFlagBack = true;
                                }
                                if(getFlag(IS_PAINTING_TILE)) {
                                    ((JComponent)comp).setFlag(
                                                 IS_PAINTING_TILE,true);
                                    shouldSetFlagBack = true;
                                }
                                if(!printing) {
                                    comp.paint(cg);
                                }
                                else {
                                    if (!getFlag(IS_PRINTING_ALL)) {
                                        comp.print(cg);
                                    }
                                    else {
                                        comp.printAll(cg);
                                    }
                                }
                            } else {
                                // The component is either lightweight, or
                                // heavyweight in a non-opaque window
                                if (!printing) {
                                    comp.paint(cg);
                                }
                                else {
                                    if (!getFlag(IS_PRINTING_ALL)) {
                                        comp.print(cg);
                                    }
                                    else {
                                        comp.printAll(cg);
                                    }
                                }
                            }
                        } finally {
                            cg.dispose();
                            if(shouldSetFlagBack) {
                                ((JComponent)comp).setFlag(
                                             ANCESTOR_USING_BUFFER,false);
                                ((JComponent)comp).setFlag(
                                             IS_PAINTING_TILE,false);
                            }
                        }
                    }
                }
            }
            recycleRectangle(tmpRect);
        }
}

Paints this component's children. If shouldUseBuffer is true, no component ancestor has a buffer and the component children can use a buffer if they have one. Otherwise, one ancestor has a buffer currently in use and children should not use a buffer to paint.

 protected  void paintComponent(Graphics g) 
{
        if (ui != null) {
            Graphics scratchGraphics = (g == null) ? null : g.create();
            try {
                ui.update(scratchGraphics, this);
            }
            finally {
                scratchGraphics.dispose();
            }
        }
}

Calls the UI delegate's paint method, if the UI delegate is non-null. We pass the delegate a copy of the Graphics object to protect the rest of the paint code from irrevocable changes (for example, Graphics.translate).

If you override this in a subclass you should not make permanent changes to the passed in Graphics. For example, you should not alter the clip Rectangle or modify the transform. If you need to do these operations you may find it easier to create a new Graphics from the passed in Graphics and manipulate it. Further, if you do not invoker super's implementation you must honor the opaque property, that is if this component is opaque, you must completely fill in the background in a non-opaque color. If you do not honor the opaque property you will likely see visual artifacts.

The passed in Graphics object might have a transform other than the identify transform installed on it. In this case, you might get unexpected results if you cumulatively apply another transform.

  void paintForceDoubleBuffered(Graphics g) 
{
        RepaintManager rm = RepaintManager.currentManager(this);
        Rectangle clip = g.getClipBounds();
        rm.beginPaint();
        setFlag(IS_REPAINTING, true);
        try {
            rm.paint(this, this, g, clip.x, clip.y, clip.width, clip.height);
        } finally {
            rm.endPaint();
            setFlag(IS_REPAINTING, false);
        }
}

 public  void paintImmediately(Rectangle r) 
{
        paintImmediately(r.x,r.y,r.width,r.height);
}

Paints the specified region now.

 public  void paintImmediately(int x,
    int y,
    int w,
    int h) 
{
        Component c = this;
        Component parent;
        if(!isShowing()) {
            return;
        }
        JComponent paintingOigin = SwingUtilities.getPaintingOrigin(this);
        if (paintingOigin != null) {
            Rectangle rectangle = SwingUtilities.convertRectangle(
                    c, new Rectangle(x, y, w, h), paintingOigin);
            paintingOigin.paintImmediately(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
            return;
        }
        while(!c.isOpaque()) {
            parent = c.getParent();
            if(parent != null) {
                x += c.getX();
                y += c.getY();
                c = parent;
            } else {
                break;
            }
            if(!(c instanceof JComponent)) {
                break;
            }
        }
        if(c instanceof JComponent) {
            ((JComponent)c)._paintImmediately(x,y,w,h);
        } else {
            c.repaint(x,y,w,h);
        }
}

Paints the specified region in this component and all of its descendants that overlap the region, immediately.

It's rarely necessary to call this method. In most cases it's more efficient to call repaint, which defers the actual painting and can collapse redundant requests into a single paint call. This method is useful if one needs to update the display while the current event is being dispatched.

This method is to be overridden when the dirty region needs to be changed for components that are painting origins.

  void paintToOffscreen(Graphics g,
    int x,
    int y,
    int w,
    int h,
    int maxX,
    int maxY) 
{
        try {
            setFlag(ANCESTOR_USING_BUFFER, true);
            if ((y + h) <  maxY || (x + w) <  maxX) {
                setFlag(IS_PAINTING_TILE, true);
            }
            if (getFlag(IS_REPAINTING)) {
                // Called from paintImmediately (RepaintManager) to fill
                // repaint request
                paint(g);
            } else {
                // Called from paint() (AWT) to repair damage
                if(!rectangleIsObscured(x, y, w, h)) {
                    paintComponent(g);
                    paintBorder(g);
                }
                paintChildren(g);
            }
        } finally {
            setFlag(ANCESTOR_USING_BUFFER, false);
            setFlag(IS_PAINTING_TILE, false);
        }
}

Paints to the specified graphics. This does not set the clip and it does not adjust the Graphics in anyway, callers must do that first. This method is package-private for RepaintManager.PaintManager and its subclasses to call, it is NOT intended for general use outside of that.

 protected String paramString() 
{
        String preferredSizeString = (isPreferredSizeSet() ?
                                      getPreferredSize().toString() : "");
        String minimumSizeString = (isMinimumSizeSet() ?
                                    getMinimumSize().toString() : "");
        String maximumSizeString = (isMaximumSizeSet() ?
                                    getMaximumSize().toString() : "");
        String borderString = (border == null ? ""
                               : (border == this ? "this" : border.toString()));
        return super.paramString() +
        ",alignmentX=" + alignmentX +
        ",alignmentY=" + alignmentY +
        ",border=" + borderString +
        ",flags=" + flags +             // should beef this up a bit
        ",maximumSize=" + maximumSizeString +
        ",minimumSize=" + minimumSizeString +
        ",preferredSize=" + preferredSizeString;
}

Returns a string representation of this JComponent. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

 public  void print(Graphics g) 
{
        setFlag(IS_PRINTING, true);
        firePropertyChange("paintingForPrint", false, true);
        try {
            paint(g);
        }
        finally {
            setFlag(IS_PRINTING, false);
            firePropertyChange("paintingForPrint", true, false);
        }
}

Invoke this method to print the component to the specified Graphics. This method will result in invocations of printComponent, printBorder and printChildren. It is recommended that you override one of the previously mentioned methods rather than this one if your intention is to customize the way printing looks. However, it can be useful to override this method should you want to prepare state before invoking the superclass behavior. As an example, if you wanted to change the component's background color before printing, you could do the following:

    public void print(Graphics g) {
        Color orig = getBackground();
        setBackground(Color.WHITE);

        // wrap in try/finally so that we always restore the state
        try {
            super.print(g);
        } finally {
            setBackground(orig);
        }
    }

Alternatively, or for components that delegate painting to other objects, you can query during painting whether or not the component is in the midst of a print operation. The isPaintingForPrint method provides this ability and its return value will be changed by this method: to true immediately before rendering and to false immediately after. With each change a property change event is fired on this component with the name "paintingForPrint".

This method sets the component's state such that the double buffer will not be used: painting will be done directly on the passed in Graphics.

 public  void printAll(Graphics g) 
{
        setFlag(IS_PRINTING_ALL, true);
        try {
            print(g);
        }
        finally {
            setFlag(IS_PRINTING_ALL, false);
        }
}

Invoke this method to print the component. This method invokes print on the component.

 protected  void printBorder(Graphics g) 
{
        paintBorder(g);
}

Prints the component's border. This is implemented to invoke paintBorder on the component. Override this if you wish to print the border differently that it is painted.

 protected  void printChildren(Graphics g) 
{
        paintChildren(g);
}

Prints this component's children. This is implemented to invoke paintChildren on the component. Override this if you wish to print the children differently than painting.

 protected  void printComponent(Graphics g) 
{
        paintComponent(g);
}

This is invoked during a printing operation. This is implemented to invoke paintComponent on the component. Override this if you wish to add special painting behavior when printing.

 protected  void processComponentKeyEvent(KeyEvent e) 
{

}

Processes any key events that the component itself recognizes. This is called after the focus manager and any interested listeners have been given a chance to steal away the event. This method is called only if the event has not yet been consumed. This method is called prior to the keyboard UI logic.

This method is implemented to do nothing. Subclasses would normally override this method if they process some key events themselves. If the event is processed, it should be consumed.

 protected boolean processKeyBinding(KeyStroke ks,
    KeyEvent e,
    int condition,
    boolean pressed) 
{
        InputMap map = getInputMap(condition, false);
        ActionMap am = getActionMap(false);
        if(map != null && am != null && isEnabled()) {
            Object binding = map.get(ks);
            Action action = (binding == null) ? null : am.get(binding);
            if (action != null) {
                return SwingUtilities.notifyAction(action, ks, e, this,
                                                   e.getModifiers());
            }
        }
        return false;
}

Invoked to process the key bindings for ks as the result of the KeyEvent e. This obtains the appropriate InputMap, gets the binding, gets the action from the ActionMap, and then (if the action is found and the component is enabled) invokes notifyAction to notify the action.

 boolean processKeyBindings(KeyEvent e,
    boolean pressed) 
{
      if (!SwingUtilities.isValidKeyEventForKeyBindings(e)) {
          return false;
      }
      // Get the KeyStroke
      // There may be two keystrokes associated with a low-level key event;
      // in this case a keystroke made of an extended key code has a priority.
      KeyStroke ks;
      KeyStroke ksE = null;
      if (e.getID() == KeyEvent.KEY_TYPED) {
          ks = KeyStroke.getKeyStroke(e.getKeyChar());
      }
      else {
          ks = KeyStroke.getKeyStroke(e.getKeyCode(),e.getModifiers(),
                                    (pressed ? false:true));
          if (e.getKeyCode() != e.getExtendedKeyCode()) {
              ksE = KeyStroke.getKeyStroke(e.getExtendedKeyCode(),e.getModifiers(),
                                    (pressed ? false:true));
          }
      }
      // Do we have a key binding for e?
      // If we have a binding by an extended code, use it.
      // If not, check for regular code binding.
      if(ksE != null && processKeyBinding(ksE, e, WHEN_FOCUSED, pressed)) {
          return true;
      }
      if(processKeyBinding(ks, e, WHEN_FOCUSED, pressed))
          return true;
      /* We have no key binding. Let's try the path from our parent to the
       * window excluded. We store the path components so we can avoid
       * asking the same component twice.
       */
      Container parent = this;
      while (parent != null && !(parent instanceof Window) &&
             !(parent instanceof Applet)) {
          if(parent instanceof JComponent) {
              if(ksE != null && ((JComponent)parent).processKeyBinding(ksE, e,
                               WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
                  return true;
              if(((JComponent)parent).processKeyBinding(ks, e,
                               WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
                  return true;
          }
          // This is done so that the children of a JInternalFrame are
          // given precedence for WHEN_IN_FOCUSED_WINDOW bindings before
          // other components WHEN_IN_FOCUSED_WINDOW bindings. This also gives
          // more precedence to the WHEN_IN_FOCUSED_WINDOW bindings of the
          // JInternalFrame's children vs the
          // WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings of the parents.
          // maybe generalize from JInternalFrame (like isFocusCycleRoot).
          if ((parent instanceof JInternalFrame) &&
              JComponent.processKeyBindingsForAllComponents(e,parent,pressed)){
              return true;
          }
          parent = parent.getParent();
      }
      /* No components between the focused component and the window is
       * actually interested by the key event. Let's try the other
       * JComponent in this window.
       */
      if(parent != null) {
        return JComponent.processKeyBindingsForAllComponents(e,parent,pressed);
      }
      return false;
}

This is invoked as the result of a KeyEvent that was not consumed by the FocusManager, KeyListeners, or the component. It will first try WHEN_FOCUSED bindings, then WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings, and finally WHEN_IN_FOCUSED_WINDOW bindings.

 static boolean processKeyBindingsForAllComponents(KeyEvent e,
    Container container,
    boolean pressed) 
{
        while (true) {
            if (KeyboardManager.getCurrentManager().fireKeyboardAction(
                                e, pressed, container)) {
                return true;
            }
            if (container instanceof Popup.HeavyWeightWindow) {
                container = ((Window)container).getOwner();
            }
            else {
                return false;
            }
        }
}

 protected  void processKeyEvent(KeyEvent e) 
{
      boolean result;
      boolean shouldProcessKey;
      // This gives the key event listeners a crack at the event
      super.processKeyEvent(e);
      // give the component itself a crack at the event
      if (! e.isConsumed()) {
          processComponentKeyEvent(e);
      }
      shouldProcessKey = KeyboardState.shouldProcess(e);
      if(e.isConsumed()) {
        return;
      }
      if (shouldProcessKey && processKeyBindings(e, e.getID() ==
                                                 KeyEvent.KEY_PRESSED)) {
          e.consume();
      }
}

Overrides processKeyEvent to process events. *

 protected  void processMouseEvent(MouseEvent e) 
{
        if (autoscrolls && e.getID() == MouseEvent.MOUSE_RELEASED) {
            Autoscroller.stop(this);
        }
        super.processMouseEvent(e);
}

Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects, refer to java.awt.Component#processMouseEvent(MouseEvent) for a complete description of this method.

 protected  void processMouseMotionEvent(MouseEvent e) 
{
        boolean dispatch = true;
        if (autoscrolls && e.getID() == MouseEvent.MOUSE_DRAGGED) {
            // We don't want to do the drags when the mouse moves if we're
            // autoscrolling.  It makes it feel spastic.
            dispatch = !Autoscroller.isRunning(this);
            Autoscroller.processMouseDragged(e);
        }
        if (dispatch) {
            super.processMouseMotionEvent(e);
        }
}

Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED.

 public final  void putClientProperty(Object key,
    Object value) 
{
        if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
            aaTextInfo = value;
            return;
        }
        if (value == null && clientProperties == null) {
            // Both the value and ArrayTable are null, implying we don't
            // have to do anything.
            return;
        }
        ArrayTable clientProperties = getClientProperties();
        Object oldValue;
        synchronized(clientProperties) {
            oldValue = clientProperties.get(key);
            if (value != null) {
                clientProperties.put(key, value);
            } else if (oldValue != null) {
                clientProperties.remove(key);
            } else {
                // old == new == null
                return;
            }
        }
        clientPropertyChanged(key, oldValue, value);
        firePropertyChange(key.toString(), oldValue, value);
}

Adds an arbitrary key/value "client property" to this component.

The get/putClientProperty methods provide access to a small per-instance hashtable. Callers can use get/putClientProperty to annotate components that were created by another module. For example, a layout manager might store per child constraints this way. For example:

componentA.putClientProperty("to the left of", componentB);

If value is null this method will remove the property. Changes to client properties are reported with PropertyChange events. The name of the property (for the sake of PropertyChange events) is key.toString().

The clientProperty dictionary is not intended to support large scale extensions to JComponent nor should be it considered an alternative to subclassing when designing a new component.

 boolean rectangleIsObscured(int x,
    int y,
    int width,
    int height) 
{
        int numChildren = getComponentCount();
        for(int i = 0; i <  numChildren; i++) {
            Component child = getComponent(i);
            int cx, cy, cw, ch;
            cx = child.getX();
            cy = child.getY();
            cw = child.getWidth();
            ch = child.getHeight();
            if (x  >= cx && (x + width) < = (cx + cw) &&
                y  >= cy && (y + height) < = (cy + ch) && child.isVisible()) {
                if(child instanceof JComponent) {
//                  System.out.println("A) checking opaque: " + ((JComponent)child).isOpaque() + "  " + child);
//                  System.out.print("B) ");
//                  Thread.dumpStack();
                    return child.isOpaque();
                } else {
                    /** Sometimes a heavy weight can have a bound larger than its peer size
                     *  so we should always draw under heavy weights
                     */
                    return false;
                }
            }
        }
        return false;
}

If the specified rectangle is completely obscured by any of this component's opaque children then returns true. Only direct children are considered, more distant descendants are ignored. A JComponent is opaque if JComponent.isOpaque() returns true, other lightweight components are always considered transparent, and heavyweight components are always considered opaque.

 public  void registerKeyboardAction(ActionListener anAction,
    KeyStroke aKeyStroke,
    int aCondition) 
{
        registerKeyboardAction(anAction,null,aKeyStroke,aCondition);
}

This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior.

 public  void registerKeyboardAction(ActionListener anAction,
    String aCommand,
    KeyStroke aKeyStroke,
    int aCondition) 
{
        InputMap inputMap = getInputMap(aCondition, true);
        if (inputMap != null) {
            ActionMap actionMap = getActionMap(true);
            ActionStandin action = new ActionStandin(anAction, aCommand);
            inputMap.put(aKeyStroke, action);
            if (actionMap != null) {
                actionMap.put(action, action);
            }
        }
}

This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior. For example, to bind the KeyStroke aKeyStroke to the Action anAction now use:

  component.getInputMap().put(aKeyStroke, aCommand);
  component.getActionMap().put(aCommmand, anAction);

The above assumes you want the binding to be applicable for WHEN_FOCUSED. To register bindings for other focus states use the getInputMap method that takes an integer.

Register a new keyboard action. anAction will be invoked if a key event matching aKeyStroke occurs and aCondition is verified. The KeyStroke object defines a particular combination of a keyboard key and one or more modifiers (alt, shift, ctrl, meta).

The aCommand will be set in the delivered event if specified.

The aCondition can be one of:

WHEN_FOCUSED

The action will be invoked only when the keystroke occurs while the component has the focus.

WHEN_IN_FOCUSED_WINDOW

The action will be invoked when the keystroke occurs while the component has the focus or if the component is in the window that has the focus. Note that the component need not be an immediate descendent of the window -- it can be anywhere in the window's containment hierarchy. In other words, whenever any component in the window has the focus, the action registered with this component is invoked.

WHEN_ANCESTOR_OF_FOCUSED_COMPONENT

The action will be invoked when the keystroke occurs while the component has the focus or if the component is an ancestor of the component that has the focus.

The combination of keystrokes and conditions lets you define high level (semantic) action events for a specified keystroke+modifier combination (using the KeyStroke class) and direct to a parent or child of a component that has the focus, or to the component itself. In other words, in any hierarchical structure of components, an arbitrary key-combination can be immediately directed to the appropriate component in the hierarchy, and cause a specific method to be invoked (usually by way of adapter objects).

If an action has already been registered for the receiving container, with the same charCode and the same modifiers, anAction will replace the action.

 public  void removeAncestorListener(AncestorListener listener) 
{
        AncestorNotifier ancestorNotifier = getAncestorNotifier();
        if (ancestorNotifier == null) {
            return;
        }
        ancestorNotifier.removeAncestorListener(listener);
        if (ancestorNotifier.listenerList.getListenerList().length == 0) {
            ancestorNotifier.removeAllListeners();
            putClientProperty(JComponent_ANCESTOR_NOTIFIER, null);
        }
}

Unregisters listener so that it will no longer receive AncestorEvents.

 public  void removeNotify() 
{
        super.removeNotify();
        // This isn't strictly correct.  The event shouldn't be
        // fired until *after* the parent is set to null.  But
        // we only get notified before that happens
        firePropertyChange("ancestor", getParent(), null);
        unregisterWithKeyboardManager();
        deregisterNextFocusableComponent();
        if (getCreatedDoubleBuffer()) {
            RepaintManager.currentManager(this).resetDoubleBuffer();
            setCreatedDoubleBuffer(false);
        }
        if (autoscrolls) {
            Autoscroller.stop(this);
        }
}

Notifies this component that it no longer has a parent component. When this method is invoked, any KeyboardActions set up in the the chain of parent components are removed. This method is called by the toolkit internally and should not be called directly by programs.

 public synchronized  void removeVetoableChangeListener(VetoableChangeListener listener) 
{
        if (vetoableChangeSupport == null) {
            return;
        }
        vetoableChangeSupport.removeVetoableChangeListener(listener);
}

Removes a VetoableChangeListener from the listener list. This removes a VetoableChangeListener that was registered for all properties.

 public  void repaint(Rectangle r) 
{
        repaint(0,r.x,r.y,r.width,r.height);
}

Adds the specified region to the dirty region list if the component is showing. The component will be repainted after all of the currently pending events have been dispatched.

 public  void repaint(long tm,
    int x,
    int y,
    int width,
    int height) 
{
        RepaintManager.currentManager(this).addDirtyRegion(this, x, y, width, height);
}

Adds the specified region to the dirty region list if the component is showing. The component will be repainted after all of the currently pending events have been dispatched.

 public boolean requestDefaultFocus() 
{
        Container nearestRoot =
            (isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
        if (nearestRoot == null) {
            return false;
        }
        Component comp = nearestRoot.getFocusTraversalPolicy().
            getDefaultComponent(nearestRoot);
        if (comp != null) {
            comp.requestFocus();
            return true;
        } else {
            return false;
        }
}

In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

Requests focus on this JComponent's FocusTraversalPolicy's default Component. If this JComponent is a focus cycle root, then its FocusTraversalPolicy is used. Otherwise, the FocusTraversalPolicy of this JComponent's focus-cycle-root ancestor is used.

 public  void requestFocus() 
{
        super.requestFocus();
}

Requests that this Component gets the input focus. Refer to Component.requestFocus() for a complete description of this method.

Note that the use of this method is discouraged because its behavior is platform dependent. Instead we recommend the use of requestFocusInWindow() . If you would like more information on focus, see How to Use the Focus Subsystem, a section in The Java Tutorial.

 public boolean requestFocus(boolean temporary) 
{
        return super.requestFocus(temporary);
}

Requests that this Component gets the input focus. Refer to Component.requestFocus(boolean) for a complete description of this method.

Note that the use of this method is discouraged because its behavior is platform dependent. Instead we recommend the use of requestFocusInWindow(boolean) . If you would like more information on focus, see How to Use the Focus Subsystem, a section in The Java Tutorial.

 public boolean requestFocusInWindow() 
{
        return super.requestFocusInWindow();
}

Requests that this Component gets the input focus. Refer to Component.requestFocusInWindow() for a complete description of this method.

If you would like more information on focus, see How to Use the Focus Subsystem, a section in The Java Tutorial.

 protected boolean requestFocusInWindow(boolean temporary) 
{
        return super.requestFocusInWindow(temporary);
}

Requests that this Component gets the input focus. Refer to Component.requestFocusInWindow(boolean) for a complete description of this method.

If you would like more information on focus, see How to Use the Focus Subsystem, a section in The Java Tutorial.

 public  void resetKeyboardActions() 
{
        // Keys
        for (int counter = 0; counter <  3; counter++) {
            InputMap inputMap = getInputMap(counter, false);
            if (inputMap != null) {
                inputMap.clear();
            }
        }
        // Actions
        ActionMap am = getActionMap(false);
        if (am != null) {
            am.clear();
        }
}

Unregisters all the bindings in the first tier InputMaps and ActionMap. This has the effect of removing any local bindings, and allowing the bindings defined in parent InputMap/ActionMaps (the UI is usually defined in the second tier) to persist.

 public  void reshape(int x,
    int y,
    int w,
    int h) 
{
        super.reshape(x, y, w, h);
}

Moves and resizes this component.

 public  void revalidate() 
{
        if (getParent() == null) {
            // Note: We don't bother invalidating here as once added
            // to a valid parent invalidate will be invoked (addImpl
            // invokes addNotify which will invoke invalidate on the
            // new Component). Also, if we do add a check to isValid
            // here it can potentially be called before the constructor
            // which was causing some people grief.
            return;
        }
        if (SwingUtilities.isEventDispatchThread()) {
            invalidate();
            RepaintManager.currentManager(this).addInvalidComponent(this);
        }
        else {
            // To avoid a flood of Runnables when constructing GUIs off
            // the EDT, a flag is maintained as to whether or not
            // a Runnable has been scheduled.
            synchronized(this) {
                if (getFlag(REVALIDATE_RUNNABLE_SCHEDULED)) {
                    return;
                }
                setFlag(REVALIDATE_RUNNABLE_SCHEDULED, true);
            }
            Runnable callRevalidate = new Runnable() {
                public void run() {
                    synchronized(JComponent.this) {
                        setFlag(REVALIDATE_RUNNABLE_SCHEDULED, false);
                    }
                    revalidate();
                }
            };
            SwingUtilities.invokeLater(callRevalidate);
        }
}

Supports deferred automatic layout.

Calls invalidate and then adds this component's validateRoot to a list of components that need to be validated. Validation will occur after all currently pending events have been dispatched. In other words after this method is called, the first validateRoot (if any) found when walking up the containment hierarchy of this component will be validated. By default, JRootPane, JScrollPane, and JTextField return true from isValidateRoot.

This method will automatically be called on this component when a property value changes such that size, location, or internal layout of this component has been affected. This automatic updating differs from the AWT because programs generally no longer need to invoke validate to get the contents of the GUI to update.

 static Graphics safelyGetGraphics(Component c) 
{
        return safelyGetGraphics(c, SwingUtilities.getRoot(c));
}

 static Graphics safelyGetGraphics(Component c,
    Component root) 
{
        synchronized(componentObtainingGraphicsFromLock) {
            componentObtainingGraphicsFrom = root;
            Graphics g = c.getGraphics();
            componentObtainingGraphicsFrom = null;
            return g;
        }
}

 public  void scrollRectToVisible(Rectangle aRect) 
{
        Container parent;
        int dx = getX(), dy = getY();
        for (parent = getParent();
                 !(parent == null) &&
                 !(parent instanceof JComponent) &&
                 !(parent instanceof CellRendererPane);
             parent = parent.getParent()) {
             Rectangle bounds = parent.getBounds();
             dx += bounds.x;
             dy += bounds.y;
        }
        if (!(parent == null) && !(parent instanceof CellRendererPane)) {
            aRect.x += dx;
            aRect.y += dy;
            ((JComponent)parent).scrollRectToVisible(aRect);
            aRect.x -= dx;
            aRect.y -= dy;
        }
}

Forwards the scrollRectToVisible() message to the JComponent's parent. Components that can service the request, such as JViewport, override this method and perform the scrolling.

 public final  void setActionMap(ActionMap am) 
{
        actionMap = am;
        setFlag(ACTIONMAP_CREATED, true);
}

Sets the ActionMap to am. This does not set the parent of the am to be the ActionMap from the UI (if there was one), it is up to the caller to have done this.

 public  void setAlignmentX(float alignmentX) 
{
        this.alignmentX = alignmentX  > 1.0f ? 1.0f : alignmentX <  0.0f ? 0.0f : alignmentX;
        isAlignmentXSet = true;
}

Sets the the vertical alignment.

 public  void setAlignmentY(float alignmentY) 
{
        this.alignmentY = alignmentY  > 1.0f ? 1.0f : alignmentY <  0.0f ? 0.0f : alignmentY;
        isAlignmentYSet = true;
}

Sets the the horizontal alignment.

 public  void setAutoscrolls(boolean autoscrolls) 
{
        setFlag(AUTOSCROLLS_SET, true);
        if (this.autoscrolls != autoscrolls) {
            this.autoscrolls = autoscrolls;
            if (autoscrolls) {
                enableEvents(AWTEvent.MOUSE_EVENT_MASK);
                enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
            }
            else {
                Autoscroller.stop(this);
            }
        }
}

Sets the autoscrolls property. If true mouse dragged events will be synthetically generated when the mouse is dragged outside of the component's bounds and mouse motion has paused (while the button continues to be held down). The synthetic events make it appear that the drag gesture has resumed in the direction established when the component's boundary was crossed. Components that support autoscrolling must handle mouseDragged events by calling scrollRectToVisible with a rectangle that contains the mouse event's location. All of the Swing components that support item selection and are typically displayed in a JScrollPane (JTable, JList, JTree, JTextArea, and JEditorPane) already handle mouse dragged events in this way. To enable autoscrolling in any other component, add a mouse motion listener that calls scrollRectToVisible. For example, given a JPanel, myPanel:

MouseMotionListener doScrollRectToVisible = new MouseMotionAdapter() {
    public void mouseDragged(MouseEvent e) {
       Rectangle r = new Rectangle(e.getX(), e.getY(), 1, 1);
       ((JPanel)e.getSource()).scrollRectToVisible(r);
   }
};
myPanel.addMouseMotionListener(doScrollRectToVisible);

The default value of the autoScrolls property is false.

 public  void setBackground(Color bg) 
{
        Color oldBg = getBackground();
        super.setBackground(bg);
        if ((oldBg != null) ? !oldBg.equals(bg) : ((bg != null) && !bg.equals(oldBg))) {
            // background already bound in AWT1.2
            repaint();
        }
}

Sets the background color of this component. The background color is used only if the component is opaque, and only by subclasses of JComponent or ComponentUI implementations. Direct subclasses of JComponent must override paintComponent to honor this property.

It is up to the look and feel to honor this property, some may choose to ignore it.

 public  void setBorder(Border border) 
{
        Border         oldBorder = this.border;
        this.border = border;
        firePropertyChange("border", oldBorder, border);
        if (border != oldBorder) {
            if (border == null || oldBorder == null ||
                !(border.getBorderInsets(this).equals(oldBorder.getBorderInsets(this)))) {
                revalidate();
            }
            repaint();
        }
}

Sets the border of this component. The Border object is responsible for defining the insets for the component (overriding any insets set directly on the component) and for optionally rendering any border decorations within the bounds of those insets. Borders should be used (rather than insets) for creating both decorative and non-decorative (such as margins and padding) regions for a swing component. Compound borders can be used to nest multiple borders within a single component.

Although technically you can set the border on any object that inherits from JComponent, the look and feel implementation of many standard Swing components doesn't work well with user-set borders. In general, when you want to set a border on a standard Swing component other than JPanel or JLabel, we recommend that you put the component in a JPanel and set the border on the JPanel.

This is a bound property.

 public  void setComponentPopupMenu(JPopupMenu popup) 
{
        if(popup != null) {
            enableEvents(AWTEvent.MOUSE_EVENT_MASK);
        }
        JPopupMenu oldPopup = this.popupMenu;
        this.popupMenu = popup;
        firePropertyChange("componentPopupMenu", oldPopup, popup);
}

Sets the JPopupMenu for this JComponent. The UI is responsible for registering bindings and adding the necessary listeners such that the JPopupMenu will be shown at the appropriate time. When the JPopupMenu is shown depends upon the look and feel: some may show it on a mouse event, some may enable a key binding.

If popup is null, and getInheritsPopupMenu returns true, then getComponentPopupMenu will be delegated to the parent. This provides for a way to make all child components inherit the popupmenu of the parent.

This is a bound property.

  void setCreatedDoubleBuffer(boolean newValue) 
{
        setFlag(CREATED_DOUBLE_BUFFER, newValue);
}

This is invoked by the RepaintManager if createImage is called on the component.

 public  void setDebugGraphicsOptions(int debugOptions) 
{
        DebugGraphics.setDebugOptions(this, debugOptions);
}

Enables or disables diagnostic information about every graphics operation performed within the component or one of its children.

 public static  void setDefaultLocale(Locale l) 
{
        SwingUtilities.appContextPut(defaultLocale, l);
}

Sets the default locale used to initialize each JComponent's locale property upon creation. The initial value is the VM's default locale. The default locale has "AppContext" scope so that applets (and potentially multiple lightweight applications running in a single VM) can have their own setting. An applet can safely alter its default locale because it will have no affect on other applets (or the browser).

 public  void setDoubleBuffered(boolean aFlag) 
{
        setFlag(IS_DOUBLE_BUFFERED,aFlag);
}

Sets whether this component should use a buffer to paint. If set to true, all the drawing from this component will be done in an offscreen painting buffer. The offscreen painting buffer will the be copied onto the screen. If a Component is buffered and one of its ancestor is also buffered, the ancestor buffer will be used.

 Object setDropLocation(DropLocation location,
    Object state,
    boolean forDrop) 
{
        return null;
}

Called to set or clear the drop location during a DnD operation. In some cases, the component may need to use its internal selection temporarily to indicate the drop location. To help facilitate this, this method returns and accepts as a parameter a state object. This state object can be used to store, and later restore, the selection state. Whatever this method returns will be passed back to it in future calls, as the state parameter. If it wants the DnD system to continue storing the same state, it must pass it back every time. Here's how this is used:

Let's say that on the first call to this method the component decides to save some state (because it is about to use the selection to show a drop index). It can return a state object to the caller encapsulating any saved selection state. On a second call, let's say the drop location is being changed to something else. The component doesn't need to restore anything yet, so it simply passes back the same state object to have the DnD system continue storing it. Finally, let's say this method is messaged with null. This means DnD is finished with this component for now, meaning it should restore state. At this point, it can use the state parameter to restore said state, and of course return null since there's no longer anything to store.

 public  void setEnabled(boolean enabled) 
{
        boolean oldEnabled = isEnabled();
        super.setEnabled(enabled);
        firePropertyChange("enabled", oldEnabled, enabled);
        if (enabled != oldEnabled) {
            repaint();
        }
}

Sets whether or not this component is enabled. A component that is enabled may respond to user input, while a component that is not enabled cannot respond to user input. Some components may alter their visual representation when they are disabled in order to provide feedback to the user that they cannot take input.

Note: Disabling a component does not disable its children.

Note: Disabling a lightweight component does not prevent it from receiving MouseEvents.

 public  void setFocusTraversalKeys(int id,
    Set<AWTKeyStroke> keystrokes) 
{
        if (id == KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS) {
            setFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET,true);
        } else if (id == KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS) {
            setFlag(FOCUS_TRAVERSAL_KEYS_BACKWARD_SET,true);
        }
        super.setFocusTraversalKeys(id,keystrokes);
}

Sets the focus traversal keys for a given traversal operation for this Component. Refer to java.awt.Component#setFocusTraversalKeys for a complete description of this method.

 public  void setFont(Font font) 
{
        Font oldFont = getFont();
        super.setFont(font);
        // font already bound in AWT1.2
        if (font != oldFont) {
            revalidate();
            repaint();
        }
}

Sets the font for this component.

 public  void setForeground(Color fg) 
{
        Color oldFg = getForeground();
        super.setForeground(fg);
        if ((oldFg != null) ? !oldFg.equals(fg) : ((fg != null) && !fg.equals(oldFg))) {
            // foreground already bound in AWT1.2
            repaint();
        }
}

Sets the foreground color of this component. It is up to the look and feel to honor this property, some may choose to ignore it.

 public  void setInheritsPopupMenu(boolean value) 
{
        boolean oldValue = getFlag(INHERITS_POPUP_MENU);
        setFlag(INHERITS_POPUP_MENU, value);
        firePropertyChange("inheritsPopupMenu", oldValue, value);
}

Sets whether or not getComponentPopupMenu should delegate to the parent if this component does not have a JPopupMenu assigned to it.

The default value for this is false, but some JComponent subclasses that are implemented as a number of JComponents may set this to true.

This is a bound property.

 public final  void setInputMap(int condition,
    InputMap map) 
{
        switch (condition) {
        case WHEN_IN_FOCUSED_WINDOW:
            if (map != null && !(map instanceof ComponentInputMap)) {
                throw new IllegalArgumentException("WHEN_IN_FOCUSED_WINDOW InputMaps must be of type ComponentInputMap");
            }
            windowInputMap = (ComponentInputMap)map;
            setFlag(WIF_INPUTMAP_CREATED, true);
            registerWithKeyboardManager(false);
            break;
        case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
            ancestorInputMap = map;
            setFlag(ANCESTOR_INPUTMAP_CREATED, true);
            break;
        case WHEN_FOCUSED:
            focusInputMap = map;
            setFlag(FOCUS_INPUTMAP_CREATED, true);
            break;
        default:
            throw new IllegalArgumentException("condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
        }
}

Sets the InputMap to use under the condition condition to map. A null value implies you do not want any bindings to be used, even from the UI. This will not reinstall the UI InputMap (if there was one). condition has one of the following values:
• WHEN_IN_FOCUSED_WINDOW
• WHEN_FOCUSED
• WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
If condition is WHEN_IN_FOCUSED_WINDOW and map is not a ComponentInputMap, an IllegalArgumentException will be thrown. Similarly, if condition is not one of the values listed, an IllegalArgumentException will be thrown.

 public  void setInputVerifier(InputVerifier inputVerifier) 
{
        InputVerifier oldInputVerifier = (InputVerifier)getClientProperty(
                                         JComponent_INPUT_VERIFIER);
        putClientProperty(JComponent_INPUT_VERIFIER, inputVerifier);
        firePropertyChange("inputVerifier", oldInputVerifier, inputVerifier);
}

Sets the input verifier for this component.

 public  void setMaximumSize(Dimension maximumSize) 
{
        super.setMaximumSize(maximumSize);
}

Sets the maximum size of this component to a constant value. Subsequent calls to getMaximumSize will always return this value; the component's UI will not be asked to compute it. Setting the maximum size to null restores the default behavior.

 public  void setMinimumSize(Dimension minimumSize) 
{
        super.setMinimumSize(minimumSize);
}

Sets the minimum size of this component to a constant value. Subsequent calls to getMinimumSize will always return this value; the component's UI will not be asked to compute it. Setting the minimum size to null restores the default behavior.

 public  void setNextFocusableComponent(Component aComponent) 
{
        boolean displayable = isDisplayable();
        if (displayable) {
            deregisterNextFocusableComponent();
        }
        putClientProperty(NEXT_FOCUS, aComponent);
        if (displayable) {
            registerNextFocusableComponent(aComponent);
        }
}

In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

Overrides the default FocusTraversalPolicy for this JComponent's focus traversal cycle by unconditionally setting the specified Component as the next Component in the cycle, and this JComponent as the specified Component's previous Component in the cycle.

 public  void setOpaque(boolean isOpaque) 
{
        boolean oldValue = getFlag(IS_OPAQUE);
        setFlag(IS_OPAQUE, isOpaque);
        setFlag(OPAQUE_SET, true);
        firePropertyChange("opaque", oldValue, isOpaque);
}

If true the component paints every pixel within its bounds. Otherwise, the component may not paint some or all of its pixels, allowing the underlying pixels to show through.

The default value of this property is false for JComponent. However, the default value for this property on most standard JComponent subclasses (such as JButton and JTree) is look-and-feel dependent.

  void setPaintingChild(Component paintingChild) 
{
        this.paintingChild = paintingChild;
}

 public  void setPreferredSize(Dimension preferredSize) 
{
        super.setPreferredSize(preferredSize);
}

Sets the preferred size of this component. If preferredSize is null, the UI will be asked for the preferred size.

 public  void setRequestFocusEnabled(boolean requestFocusEnabled) 
{
        setFlag(REQUEST_FOCUS_DISABLED, !requestFocusEnabled);
}

Provides a hint as to whether or not this JComponent should get focus. This is only a hint, and it is up to consumers that are requesting focus to honor this property. This is typically honored for mouse operations, but not keyboard operations. For example, look and feels could verify this property is true before requesting focus during a mouse operation. This would often times be used if you did not want a mouse press on a JComponent to steal focus, but did want the JComponent to be traversable via the keyboard. If you do not want this JComponent focusable at all, use the setFocusable method instead.

Please see How to Use the Focus Subsystem, a section in The Java Tutorial, for more information.

 public  void setToolTipText(String text) 
{
        String oldText = getToolTipText();
        putClientProperty(TOOL_TIP_TEXT_KEY, text);
        ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
        if (text != null) {
            if (oldText == null) {
                toolTipManager.registerComponent(this);
            }
        } else {
            toolTipManager.unregisterComponent(this);
        }
}

Registers the text to display in a tool tip. The text displays when the cursor lingers over the component.

See How to Use Tool Tips in The Java Tutorial for further documentation.

 public  void setTransferHandler(TransferHandler newHandler) 
{
        TransferHandler oldHandler = (TransferHandler)getClientProperty(
                                      JComponent_TRANSFER_HANDLER);
        putClientProperty(JComponent_TRANSFER_HANDLER, newHandler);
        SwingUtilities.installSwingDropTargetAsNecessary(this, newHandler);
        firePropertyChange("transferHandler", oldHandler, newHandler);
}

Sets the {@code TransferHandler}, which provides support for transfer of data into and out of this component via cut/copy/paste and drag and drop. This may be {@code null} if the component does not support data transfer operations.

If the new {@code TransferHandler} is not {@code null}, this method also installs a new {@code DropTarget} on the component to activate drop handling through the {@code TransferHandler} and activate any built-in support (such as calculating and displaying potential drop locations). If you do not wish for this component to respond in any way to drops, you can disable drop support entirely either by removing the drop target ({@code setDropTarget(null)}) or by de-activating it ({@code getDropTaget().setActive(false)}).

If the new {@code TransferHandler} is {@code null}, this method removes the drop target.

Under two circumstances, this method does not modify the drop target: First, if the existing drop target on this component was explicitly set by the developer to a {@code non-null} value. Second, if the system property {@code suppressSwingDropSupport} is {@code true}. The default value for the system property is {@code false}.

Please see How to Use Drag and Drop and Data Transfer, a section in The Java Tutorial, for more information.

 protected  void setUI(ComponentUI newUI) 
{
        /* We do not check that the UI instance is different
         * before allowing the switch in order to enable the
         * same UI instance *with different default settings*
         * to be installed.
         */
        uninstallUIAndProperties();
        // aaText shouldn't persist between look and feels, reset it.
        aaTextInfo =
            UIManager.getDefaults().get(SwingUtilities2.AA_TEXT_PROPERTY_KEY);
        ComponentUI oldUI = ui;
        ui = newUI;
        if (ui != null) {
            ui.installUI(this);
        }
        firePropertyChange("UI", oldUI, newUI);
        revalidate();
        repaint();
}

Sets the look and feel delegate for this component. JComponent subclasses generally override this method to narrow the argument type. For example, in JSlider:

public void setUI(SliderUI newUI) {
    super.setUI(newUI);
}
 

Additionally JComponent subclasses must provide a getUI method that returns the correct type. For example:

public SliderUI getUI() {
    return (SliderUI)ui;
}

  void setUIProperty(String propertyName,
    Object value) 
{
        if (propertyName == "opaque") {
            if (!getFlag(OPAQUE_SET)) {
                setOpaque(((Boolean)value).booleanValue());
                setFlag(OPAQUE_SET, false);
            }
        } else if (propertyName == "autoscrolls") {
            if (!getFlag(AUTOSCROLLS_SET)) {
                setAutoscrolls(((Boolean)value).booleanValue());
                setFlag(AUTOSCROLLS_SET, false);
            }
        } else if (propertyName == "focusTraversalKeysForward") {
            if (!getFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET)) {
                super.setFocusTraversalKeys(KeyboardFocusManager.
                                            FORWARD_TRAVERSAL_KEYS,
                                            (Set)value);
            }
        } else if (propertyName == "focusTraversalKeysBackward") {
            if (!getFlag(FOCUS_TRAVERSAL_KEYS_BACKWARD_SET)) {
                super.setFocusTraversalKeys(KeyboardFocusManager.
                                            BACKWARD_TRAVERSAL_KEYS,
                                            (Set)value);
            }
        } else {
            throw new IllegalArgumentException("property \""+
                                               propertyName+ "\" cannot be set using this method");
        }
}

 public  void setVerifyInputWhenFocusTarget(boolean verifyInputWhenFocusTarget) 
{
        boolean oldVerifyInputWhenFocusTarget =
            this.verifyInputWhenFocusTarget;
        this.verifyInputWhenFocusTarget = verifyInputWhenFocusTarget;
        firePropertyChange("verifyInputWhenFocusTarget",
                           oldVerifyInputWhenFocusTarget,
                           verifyInputWhenFocusTarget);
}

Sets the value to indicate whether input verifier for the current focus owner will be called before this component requests focus. The default is true. Set to false on components such as a Cancel button or a scrollbar, which should activate even if the input in the current focus owner is not "passed" by the input verifier for that component.

 public  void setVisible(boolean aFlag) 
{
        if(aFlag != isVisible()) {
            super.setVisible(aFlag);
            Container parent = getParent();
            if(parent != null) {
                Rectangle r = getBounds();
                parent.repaint(r.x,r.y,r.width,r.height);
            }
            // Some (all should) LayoutManagers do not consider components
            // that are not visible. As such we need to revalidate when the
            // visible bit changes.
            revalidate();
        }
}

Makes the component visible or invisible. Overrides Component.setVisible.

 static  void setWriteObjCounter(JComponent comp,
    byte count) 
{
        comp.flags = (comp.flags & ~(0xFF < <  WRITE_OBJ_COUNTER_FIRST)) |
                     (count < <  WRITE_OBJ_COUNTER_FIRST);
}

 int shouldDebugGraphics() 
{
        return DebugGraphics.shouldComponentDebug(this);
}

Returns true if debug information is enabled for this JComponent or one of its parents.

  void superProcessMouseMotionEvent(MouseEvent e) 
{
        super.processMouseMotionEvent(e);
}

 public  void unregisterKeyboardAction(KeyStroke aKeyStroke) 
{
        ActionMap am = getActionMap(false);
        for (int counter = 0; counter <  3; counter++) {
            InputMap km = getInputMap(counter, false);
            if (km != null) {
                Object actionID = km.get(aKeyStroke);
                if (am != null && actionID != null) {
                    am.remove(actionID);
                }
                km.remove(aKeyStroke);
            }
        }
}

This method is now obsolete. To unregister an existing binding you can either remove the binding from the ActionMap/InputMap, or place a dummy binding the InputMap. Removing the binding from the InputMap allows bindings in parent InputMaps to be active, whereas putting a dummy binding in the InputMap effectively disables the binding from ever happening.

Unregisters a keyboard action. This will remove the binding from the ActionMap (if it exists) as well as the InputMaps.

 public  void update(Graphics g) 
{
        paint(g);
}

Calls paint. Doesn't clear the background but see ComponentUI.update, which is called by paintComponent.

 public  void updateUI() 
{

}

Resets the UI property to a value from the current look and feel. JComponent subclasses must override this method like this:

  public void updateUI() {
     setUI((SliderUI)UIManager.getUI(this);
  }