JComponent.
*/
protected AccessibleContext accessibleContext;
/**
* Basic accessibility support for JComponent derived
* widgets.
*/
public abstract class AccessibleJComponent
extends AccessibleAWTContainer
implements AccessibleExtendedComponent
{
/**
* Receives notification if the focus on the JComponent changes and
* fires appropriate PropertyChangeEvents to listeners registered with
* the AccessibleJComponent.
*/
protected class AccessibleFocusHandler
implements FocusListener
{
/**
* Creates a new AccessibleFocusHandler.
*/
protected AccessibleFocusHandler()
{
// Nothing to do here.
}
/**
* Receives notification when the JComponent gained focus and fires
* a PropertyChangeEvent to listeners registered on the
* AccessibleJComponent with a property name of
* {@link AccessibleContext#ACCESSIBLE_STATE_PROPERTY} and a new value
* of {@link AccessibleState#FOCUSED}.
*/
public void focusGained(FocusEvent event)
{
AccessibleJComponent.this.firePropertyChange
(AccessibleContext.ACCESSIBLE_STATE_PROPERTY, null,
AccessibleState.FOCUSED);
}
/**
* Receives notification when the JComponent lost focus and fires
* a PropertyChangeEvent to listeners registered on the
* AccessibleJComponent with a property name of
* {@link AccessibleContext#ACCESSIBLE_STATE_PROPERTY} and an old value
* of {@link AccessibleState#FOCUSED}.
*/
public void focusLost(FocusEvent valevent)
{
AccessibleJComponent.this.firePropertyChange
(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.FOCUSED, null);
}
}
/**
* Receives notification if there are child components are added or removed
* from the JComponent and fires appropriate PropertyChangeEvents to
* interested listeners on the AccessibleJComponent.
*/
protected class AccessibleContainerHandler
implements ContainerListener
{
/**
* Creates a new AccessibleContainerHandler.
*/
protected AccessibleContainerHandler()
{
// Nothing to do here.
}
/**
* Receives notification when a child component is added to the
* JComponent and fires a PropertyChangeEvent on listeners registered
* with the AccessibleJComponent with a property name of
* {@link AccessibleContext#ACCESSIBLE_CHILD_PROPERTY}.
*
* @param event the container event
*/
public void componentAdded(ContainerEvent event)
{
Component c = event.getChild();
if (c != null && c instanceof Accessible)
{
AccessibleContext childCtx = c.getAccessibleContext();
AccessibleJComponent.this.firePropertyChange
(AccessibleContext.ACCESSIBLE_CHILD_PROPERTY, null, childCtx);
}
}
/**
* Receives notification when a child component is removed from the
* JComponent and fires a PropertyChangeEvent on listeners registered
* with the AccessibleJComponent with a property name of
* {@link AccessibleContext#ACCESSIBLE_CHILD_PROPERTY}.
*
* @param event the container event
*/
public void componentRemoved(ContainerEvent event)
{
Component c = event.getChild();
if (c != null && c instanceof Accessible)
{
AccessibleContext childCtx = c.getAccessibleContext();
AccessibleJComponent.this.firePropertyChange
(AccessibleContext.ACCESSIBLE_CHILD_PROPERTY, childCtx, null);
}
}
}
private static final long serialVersionUID = -7047089700479897799L;
/**
* Receives notification when a child component is added to the
* JComponent and fires a PropertyChangeEvent on listeners registered
* with the AccessibleJComponent.
*
* @specnote AccessibleAWTContainer has a protected field with the same
* name. Looks like a bug or nasty misdesign to me.
*/
protected ContainerListener accessibleContainerHandler;
/**
* Receives notification if the focus on the JComponent changes and
* fires appropriate PropertyChangeEvents to listeners registered with
* the AccessibleJComponent.
*
* @specnote AccessibleAWTComponent has a protected field
* accessibleAWTFocusHandler. Looks like a bug or nasty misdesign
* to me.
*/
protected FocusListener accessibleFocusHandler;
/**
* Creates a new AccessibleJComponent.
*/
protected AccessibleJComponent()
{
// Nothing to do here.
}
/**
* Adds a property change listener to the list of registered listeners.
*
* This sets up the {@link #accessibleContainerHandler} and
* {@link #accessibleFocusHandler} fields and calls
* super.addPropertyChangeListener(listener).
*
* @param listener the listener to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener)
{
// Tests seem to indicate that this method also sets up the other two
// handlers.
if (accessibleContainerHandler == null)
{
accessibleContainerHandler = new AccessibleContainerHandler();
addContainerListener(accessibleContainerHandler);
}
if (accessibleFocusHandler == null)
{
accessibleFocusHandler = new AccessibleFocusHandler();
addFocusListener(accessibleFocusHandler);
}
super.addPropertyChangeListener(listener);
}
/**
* Removes a property change listener from the list of registered listeners.
*
* This uninstalls the {@link #accessibleContainerHandler} and
* {@link #accessibleFocusHandler} fields and calls
* super.removePropertyChangeListener(listener).
*
* @param listener the listener to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener)
{
// Tests seem to indicate that this method also resets the other two
// handlers.
if (accessibleContainerHandler != null)
{
removeContainerListener(accessibleContainerHandler);
accessibleContainerHandler = null;
}
if (accessibleFocusHandler != null)
{
removeFocusListener(accessibleFocusHandler);
accessibleFocusHandler = null;
}
super.removePropertyChangeListener(listener);
}
/**
* Returns the number of accessible children of this object.
*
* @return the number of accessible children of this object
*/
public int getAccessibleChildrenCount()
{
// TODO: The functionality should be performed in the superclass.
// Find out why this is overridden. However, it is very well possible
// that this is left over from times when there was no such superclass
// method.
return super.getAccessibleChildrenCount();
}
/**
* Returns the accessible child component at index i.
*
* @param i the index of the accessible child to return
*
* @return the accessible child component at index i
*/
public Accessible getAccessibleChild(int i)
{
// TODO: The functionality should be performed in the superclass.
// Find out why this is overridden. However, it is very well possible
// that this is left over from times when there was no such superclass
// method.
return super.getAccessibleChild(i);
}
/**
* Returns the accessible state set of this component.
*
* @return the accessible state set of this component
*/
public AccessibleStateSet getAccessibleStateSet()
{
// Note: While the java.awt.Component has an 'opaque' property, it
// seems that it is not added to the accessible state set there, even
// if this property is true. However, it is handled for JComponent, so
// we add it here.
AccessibleStateSet state = super.getAccessibleStateSet();
if (isOpaque())
state.add(AccessibleState.OPAQUE);
return state;
}
/**
* Returns the localized name for this object. Generally this should
* almost never return {@link Component#getName()} since that is not
* a localized name. If the object is some kind of text component (like
* a menu item), then the value of the object may be returned. Also, if
* the object has a tooltip, the value of the tooltip may also be
* appropriate.
*
* @return the localized name for this object or null if this
* object has no name
*/
public String getAccessibleName()
{
String name = super.getAccessibleName();
// There are two fallbacks provided by the JComponent in the case the
// superclass returns null:
// - If the component is inside a titled border, then it inherits the
// name from the border title.
// - If the component is not inside a titled border but has a label
// (via JLabel.setLabelFor()), then it gets the name from the label's
// accessible context.
if (name == null)
{
name = getTitledBorderText();
}
if (name == null)
{
Object l = getClientProperty(JLabel.LABEL_PROPERTY);
if (l instanceof Accessible)
{
AccessibleContext labelCtx =
((Accessible) l).getAccessibleContext();
name = labelCtx.getAccessibleName();
}
}
return name;
}
/**
* Returns the localized description of this object.
*
* @return the localized description of this object or null
* if this object has no description
*/
public String getAccessibleDescription()
{
// There are two fallbacks provided by the JComponent in the case the
// superclass returns null:
// - If the component has a tooltip, then inherit the description from
// the tooltip.
// - If the component is not inside a titled border but has a label
// (via JLabel.setLabelFor()), then it gets the name from the label's
// accessible context.
String descr = super.getAccessibleDescription();
if (descr == null)
{
descr = getToolTipText();
}
if (descr == null)
{
Object l = getClientProperty(JLabel.LABEL_PROPERTY);
if (l instanceof Accessible)
{
AccessibleContext labelCtx =
((Accessible) l).getAccessibleContext();
descr = labelCtx.getAccessibleName();
}
}
return descr;
}
/**
* Returns the accessible role of this component.
*
* @return the accessible role of this component
*
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole()
{
return AccessibleRole.SWING_COMPONENT;
}
/**
* Recursivly searches a border hierarchy (starting at border) for
* a titled border and returns the title if one is found, null
* otherwise.
*
* @param border the border to start search from
*
* @return the border title of a possibly found titled border
*/
protected String getBorderTitle(Border border)
{
String title = null;
if (border instanceof CompoundBorder)
{
CompoundBorder compound = (CompoundBorder) border;
Border inner = compound.getInsideBorder();
title = getBorderTitle(inner);
if (title == null)
{
Border outer = compound.getOutsideBorder();
title = getBorderTitle(outer);
}
}
else if (border instanceof TitledBorder)
{
TitledBorder titled = (TitledBorder) border;
title = titled.getTitle();
}
return title;
}
/**
* Returns the tooltip text for this accessible component.
*
* @return the tooltip text for this accessible component
*/
public String getToolTipText()
{
return JComponent.this.getToolTipText();
}
/**
* Returns the title of the border of this accessible component if
* this component has a titled border, otherwise returns null.
*
* @return the title of the border of this accessible component if
* this component has a titled border, otherwise returns
* null
*/
public String getTitledBorderText()
{
return getBorderTitle(getBorder());
}
/**
* Returns the keybindings associated with this accessible component or
* null if the component does not support key bindings.
*
* @return the keybindings associated with this accessible component
*/
public AccessibleKeyBinding getAccessibleKeyBinding()
{
// The reference implementation seems to always return null here,
// independent of the key bindings of the JComponent. So do we.
return null;
}
}
/**
* A value between 0.0 and 1.0 indicating the preferred horizontal
* alignment of the component, relative to its siblings. The values
* {@link #LEFT_ALIGNMENT}, {@link #CENTER_ALIGNMENT}, and {@link
* #RIGHT_ALIGNMENT} can also be used, as synonyms for 0.0,
* 0.5, and 1.0, respectively. Not all layout
* managers use this property.
*
* @see #getAlignmentX
* @see #setAlignmentX
* @see javax.swing.OverlayLayout
* @see javax.swing.BoxLayout
*/
float alignmentX = -1.0F;
/**
* A value between 0.0 and 1.0 indicating the preferred vertical
* alignment of the component, relative to its siblings. The values
* {@link #TOP_ALIGNMENT}, {@link #CENTER_ALIGNMENT}, and {@link
* #BOTTOM_ALIGNMENT} can also be used, as synonyms for 0.0,
* 0.5, and 1.0, respectively. Not all layout
* managers use this property.
*
* @see #getAlignmentY
* @see #setAlignmentY
* @see javax.swing.OverlayLayout
* @see javax.swing.BoxLayout
*/
float alignmentY = -1.0F;
/**
* The border painted around this component.
*
* @see #paintBorder
*/
Border border;
/**
* The popup menu for the component.
*
* @see #getComponentPopupMenu()
* @see #setComponentPopupMenu(JPopupMenu)
*/
JPopupMenu componentPopupMenu;
/**
* A flag that controls whether the {@link #getComponentPopupMenu()} method
* looks to the component's parent when the componentPopupMenu
* field is null.
*/
boolean inheritsPopupMenu;
/**
* Whether to double buffer this component when painting. This flag
* should generally be true, to ensure good painting
* performance.
*
* All children of a double buffered component are painted into the
* double buffer automatically, so only the top widget in a window needs
* to be double buffered.
*
* @see #setDoubleBuffered
* @see #isDoubleBuffered
* @see #paint
*/
boolean doubleBuffered = true;
/**
* A set of flags indicating which debugging graphics facilities should
* be enabled on this component. The values should be a combination of
* {@link DebugGraphics#NONE_OPTION}, {@link DebugGraphics#LOG_OPTION},
* {@link DebugGraphics#FLASH_OPTION}, or {@link
* DebugGraphics#BUFFERED_OPTION}.
*
* @see #setDebugGraphicsOptions
* @see #getDebugGraphicsOptions
* @see DebugGraphics
* @see #getComponentGraphics
*/
int debugGraphicsOptions;
/**
* This property controls two independent behaviors simultaneously.
*
* First, it controls whether to fill the background of this widget
* when painting its body. This affects calls to {@link
* JComponent#paintComponent}, which in turn calls {@link
* ComponentUI#update} on the component's {@link #ui} property. If the
* component is opaque during this call, the background will be filled
* before calling {@link ComponentUI#paint}. This happens merely as a
* convenience; you may fill the component's background yourself too,
* but there is no need to do so if you will be filling with the same
* color.
*
* Second, it the opaque property informs swing's repaint system
* whether it will be necessary to paint the components "underneath" this
* component, in Z-order. If the component is opaque, it is considered to
* completely occlude components "underneath" it, so they will not be
* repainted along with the opaque component.
*
* The default value for this property is false, but most
* components will want to set it to true when installing UI
* defaults in {@link ComponentUI#installUI}.
*
* @see #setOpaque
* @see #isOpaque
* @see #paintComponent
*/
boolean opaque = false;
/**
* The user interface delegate for this component. Event delivery and
* repainting of the component are usually delegated to this object.
*
* @see #setUI
* @see #getUIClassID
* @see #updateUI
*/
protected ComponentUI ui;
/**
* A hint to the focus system that this component should or should not
* get focus. If this is false, swing will not try to
* request focus on this component; if true, swing might
* try to request focus, but the request might fail. Thus it is only
* a hint guiding swing's behavior.
*
* @see #requestFocus()
* @see #isRequestFocusEnabled
* @see #setRequestFocusEnabled
*/
boolean requestFocusEnabled;
/**
* Flag indicating behavior of this component when the mouse is dragged
* outside the component and the mouse stops moving. If
* true, synthetic mouse events will be delivered on regular
* timed intervals, continuing off in the direction the mouse exited the
* component, until the mouse is released or re-enters the component.
*
* @see #setAutoscrolls
* @see #getAutoscrolls
*/
boolean autoscrolls = false;
/**
* Indicates whether the current paint call is already double buffered or
* not.
*/
static boolean paintingDoubleBuffered = false;
/**
* Indicates whether we are calling paintDoubleBuffered() from
* paintImmadiately (RepaintManager) or from paint() (AWT refresh).
*/
static boolean isRepainting = false;
/**
* Listeners for events other than {@link PropertyChangeEvent} are
* handled by this listener list. PropertyChangeEvents are handled in
* {@link #changeSupport}.
*/
protected EventListenerList listenerList = new EventListenerList();
/**
* Handles VetoableChangeEvents.
*/
private VetoableChangeSupport vetoableChangeSupport;
/**
* Storage for "client properties", which are key/value pairs associated
* with this component by a "client", such as a user application or a
* layout manager. This is lazily constructed when the component gets its
* first client property.
*/
private Hashtable clientProperties;
private InputMap inputMap_whenFocused;
private InputMap inputMap_whenAncestorOfFocused;
private ComponentInputMap inputMap_whenInFocusedWindow;
private ActionMap actionMap;
/** @since 1.3 */
private boolean verifyInputWhenFocusTarget = true;
private InputVerifier inputVerifier;
private TransferHandler transferHandler;
/**
* Indicates if this component is currently painting a tile or not.
*/
private boolean paintingTile;
/**
* A temporary buffer used for fast dragging of components.
*/
private Image dragBuffer;
/**
* Indicates if the dragBuffer is already initialized.
*/
private boolean dragBufferInitialized;
/**
* A cached Rectangle object to be reused. Be careful when you use that,
* so that it doesn't get modified in another context within the same
* method call chain.
*/
private static transient Rectangle rectCache;
/**
* The default locale of the component.
*
* @see #getDefaultLocale
* @see #setDefaultLocale
*/
private static Locale defaultLocale;
public static final String TOOL_TIP_TEXT_KEY = "ToolTipText";
/**
* Constant used to indicate that no condition has been assigned to a
* particular action.
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
*/
public static final int UNDEFINED_CONDITION = -1;
/**
* Constant used to indicate that an action should be performed only when
* the component has focus.
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
*/
public static final int WHEN_FOCUSED = 0;
/**
* Constant used to indicate that an action should be performed only when
* the component is an ancestor of the component which has focus.
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
*/
public static final int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT = 1;
/**
* Constant used to indicate that an action should be performed only when
* the component is in the window which has focus.
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
*/
public static final int WHEN_IN_FOCUSED_WINDOW = 2;
/**
* Used to optimize painting. This is set in paintImmediately2() to specify
* the exact component path to be painted by paintChildren.
*/
Component paintChild;
/**
* Indicates if the opaque property has been set by a client program or by
* the UI.
*
* @see #setUIProperty(String, Object)
* @see LookAndFeel#installProperty(JComponent, String, Object)
*/
private boolean clientOpaqueSet = false;
/**
* Indicates if the autoscrolls property has been set by a client program or
* by the UI.
*
* @see #setUIProperty(String, Object)
* @see LookAndFeel#installProperty(JComponent, String, Object)
*/
private boolean clientAutoscrollsSet = false;
/**
* Creates a new JComponent instance.
*/
public JComponent()
{
super();
setDropTarget(new DropTarget());
setLocale(getDefaultLocale());
debugGraphicsOptions = DebugGraphics.NONE_OPTION;
setRequestFocusEnabled(true);
}
/**
* Helper to lazily construct and return the client properties table.
*
* @return The current client properties table
*
* @see #clientProperties
* @see #getClientProperty
* @see #putClientProperty
*/
private Hashtable getClientProperties()
{
if (clientProperties == null)
clientProperties = new Hashtable();
return clientProperties;
}
/**
* Get a client property associated with this component and a particular
* key.
*
* @param key The key with which to look up the client property
*
* @return A client property associated with this object and key
*
* @see #clientProperties
* @see #getClientProperties
* @see #putClientProperty
*/
public final Object getClientProperty(Object key)
{
return getClientProperties().get(key);
}
/**
* Add a client property value to this component, associated
* with key. If there is an existing client property
* associated with key, it will be replaced. A
* {@link PropertyChangeEvent} is sent to registered listeners (with the
* name of the property being key.toString()).
*
* @param key The key of the client property association to add
* @param value The value of the client property association to add
*
* @see #clientProperties
* @see #getClientProperties
* @see #getClientProperty
*/
public final void putClientProperty(Object key, Object value)
{
Hashtable t = getClientProperties();
Object old = t.get(key);
if (value != null)
t.put(key, value);
else
t.remove(key);
// When both old and new value are null, no event is fired. This is
// different from what firePropertyChange() normally does, so we add this
// check here.
if (old != null || value != null)
firePropertyChange(key.toString(), old, value);
}
/**
* Unregister an AncestorListener.
*
* @param listener The listener to unregister
*
* @see #addAncestorListener
*/
public void removeAncestorListener(AncestorListener listener)
{
listenerList.remove(AncestorListener.class, listener);
}
/**
* Unregister a VetoableChangeChangeListener.
*
* @param listener The listener to unregister
*
* @see #addVetoableChangeListener
*/
public void removeVetoableChangeListener(VetoableChangeListener listener)
{
if (vetoableChangeSupport != null)
vetoableChangeSupport.removeVetoableChangeListener(listener);
}
/**
* Register an AncestorListener.
*
* @param listener The listener to register
*
* @see #removeVetoableChangeListener
*/
public void addAncestorListener(AncestorListener listener)
{
listenerList.add(AncestorListener.class, listener);
}
/**
* Register a VetoableChangeListener.
*
* @param listener The listener to register
*
* @see #removeVetoableChangeListener
* @see #listenerList
*/
public void addVetoableChangeListener(VetoableChangeListener listener)
{
// Lazily instantiate this, it's rarely needed.
if (vetoableChangeSupport == null)
vetoableChangeSupport = new VetoableChangeSupport(this);
vetoableChangeSupport.addVetoableChangeListener(listener);
}
/**
* Returns all registered {@link EventListener}s of the given
* listenerType.
*
* @param listenerType the class of listeners to filter (null
* not permitted).
*
* @return An array of registered listeners.
*
* @throws ClassCastException if listenerType does not implement
* the {@link EventListener} interface.
* @throws NullPointerException if listenerType is
* null.
*
* @see #getAncestorListeners()
* @see #listenerList
*
* @since 1.3
*/
public EventListener[] getListeners(Class listenerType)
{
if (listenerType == PropertyChangeListener.class)
return getPropertyChangeListeners();
else if (listenerType == VetoableChangeListener.class)
return getVetoableChangeListeners();
else
return listenerList.getListeners(listenerType);
}
/**
* Return all registered AncestorListener objects.
*
* @return The set of AncestorListener objects in {@link
* #listenerList}
*/
public AncestorListener[] getAncestorListeners()
{
return (AncestorListener[]) getListeners(AncestorListener.class);
}
/**
* Return all registered VetoableChangeListener objects.
*
* @return An array of the VetoableChangeListener objects
* registered with this component (possibly empty but never
* null).
*
* @since 1.4
*/
public VetoableChangeListener[] getVetoableChangeListeners()
{
return vetoableChangeSupport == null ? new VetoableChangeListener[0]
: vetoableChangeSupport.getVetoableChangeListeners();
}
/**
* Call {@link VetoableChangeListener#vetoableChange} on all listeners
* registered to listen to a given property. Any method which changes
* the specified property of this component should call this method.
*
* @param propertyName The property which changed
* @param oldValue The old value of the property
* @param newValue The new value of the property
*
* @throws PropertyVetoException if the change was vetoed by a listener
*
* @see #addVetoableChangeListener
* @see #removeVetoableChangeListener
*/
protected void fireVetoableChange(String propertyName, Object oldValue,
Object newValue)
throws PropertyVetoException
{
if (vetoableChangeSupport != null)
vetoableChangeSupport.fireVetoableChange(propertyName, oldValue, newValue);
}
/**
* Fires a property change for a primitive integer property.
*
* @param property the name of the property
* @param oldValue the old value of the property
* @param newValue the new value of the property
*
* @specnote This method is implemented in
* {@link Component#firePropertyChange(String, int, int)}. It is
* only here because it is specified to be public, whereas the
* Component method is protected.
*/
public void firePropertyChange(String property, int oldValue, int newValue)
{
super.firePropertyChange(property, oldValue, newValue);
}
/**
* Fires a property change for a primitive boolean property.
*
* @param property the name of the property
* @param oldValue the old value of the property
* @param newValue the new value of the property
*
* @specnote This method is implemented in
* {@link Component#firePropertyChange(String, boolean, boolean)}.
* It is only here because it is specified to be public, whereas
* the Component method is protected.
*/
public void firePropertyChange(String property, boolean oldValue,
boolean newValue)
{
super.firePropertyChange(property, oldValue, newValue);
}
/**
* Fires a property change for a primitive character property.
*
* @param property the name of the property
* @param oldValue the old value of the property
* @param newValue the new value of the property
*/
public void firePropertyChange(String property, char oldValue,
char newValue)
{
// FIXME - This method is already public in awt Component, but
// is included here to work around a compilation bug in gcj 4.1.
super.firePropertyChange(property, oldValue, newValue);
}
/**
* Get the value of the accessibleContext property for this component.
*
* @return the current value of the property
*/
public AccessibleContext getAccessibleContext()
{
return null;
}
/**
* Get the value of the {@link #alignmentX} property.
*
* @return The current value of the property.
*
* @see #setAlignmentX
* @see #alignmentY
*/
public float getAlignmentX()
{
float ret = alignmentX;
if (alignmentX < 0)
// alignment has not been set explicitly.
ret = super.getAlignmentX();
return ret;
}
/**
* Get the value of the {@link #alignmentY} property.
*
* @return The current value of the property.
*
* @see #setAlignmentY
* @see #alignmentX
*/
public float getAlignmentY()
{
float ret = alignmentY;
if (alignmentY < 0)
// alignment has not been set explicitly.
ret = super.getAlignmentY();
return ret;
}
/**
* Get the current value of the {@link #autoscrolls} property.
*
* @return The current value of the property
*/
public boolean getAutoscrolls()
{
return autoscrolls;
}
/**
* Set the value of the {@link #border} property.
*
* @param newBorder The new value of the property
*
* @see #getBorder
*/
public void setBorder(Border newBorder)
{
Border oldBorder = getBorder();
if (oldBorder == newBorder)
return;
border = newBorder;
firePropertyChange("border", oldBorder, newBorder);
repaint();
}
/**
* Get the value of the {@link #border} property.
*
* @return The property's current value
*
* @see #setBorder
*/
public Border getBorder()
{
return border;
}
/**
* Get the component's current bounding box. If a rectangle is provided,
* use this as the return value (adjusting its fields in place);
* otherwise (of null is provided) return a new {@link
* Rectangle}.
*
* @param rv Optional return value to use
*
* @return A rectangle bounding the component
*/
public Rectangle getBounds(Rectangle rv)
{
if (rv == null)
return new Rectangle(getX(), getY(), getWidth(), getHeight());
else
{
rv.setBounds(getX(), getY(), getWidth(), getHeight());
return rv;
}
}
/**
* Prepares a graphics context for painting this object. If {@link
* #debugGraphicsOptions} is not equal to {@link
* DebugGraphics#NONE_OPTION}, produce a new {@link DebugGraphics} object
* wrapping the parameter. Otherwise configure the parameter with this
* component's foreground color and font.
*
* @param g The graphics context to wrap or configure
*
* @return A graphics context to paint this object with
*
* @see #debugGraphicsOptions
* @see #paint
*/
protected Graphics getComponentGraphics(Graphics g)
{
Graphics g2 = g;
int options = getDebugGraphicsOptions();
if (options != DebugGraphics.NONE_OPTION)
{
if (!(g2 instanceof DebugGraphics))
g2 = new DebugGraphics(g);
DebugGraphics dg = (DebugGraphics) g2;
dg.setDebugOptions(dg.getDebugOptions() | options);
}
g2.setFont(this.getFont());
g2.setColor(this.getForeground());
return g2;
}
/**
* Get the value of the {@link #debugGraphicsOptions} property.
*
* @return The current value of the property.
*
* @see #setDebugGraphicsOptions
* @see #debugGraphicsOptions
*/
public int getDebugGraphicsOptions()
{
String option = System.getProperty("gnu.javax.swing.DebugGraphics");
int options = debugGraphicsOptions;
if (option != null && option.length() != 0)
{
if (options < 0)
options = 0;
if (option.equals("LOG"))
options |= DebugGraphics.LOG_OPTION;
else if (option.equals("FLASH"))
options |= DebugGraphics.FLASH_OPTION;
}
return options;
}
/**
* Get the component's insets, which are calculated from
* the {@link #border} property. If the border is null,
* calls {@link Container#getInsets}.
*
* @return The component's current insets
*/
public Insets getInsets()
{
if (border == null)
return super.getInsets();
return getBorder().getBorderInsets(this);
}
/**
* Get the component's insets, which are calculated from the {@link
* #border} property. If the border is null, calls {@link
* Container#getInsets}. The passed-in {@link Insets} value will be
* used as the return value, if possible.
*
* @param insets Return value object to reuse, if possible
*
* @return The component's current insets
*/
public Insets getInsets(Insets insets)
{
Insets t = getInsets();
if (insets == null)
return t;
insets.left = t.left;
insets.right = t.right;
insets.top = t.top;
insets.bottom = t.bottom;
return insets;
}
/**
* Get the component's location. The passed-in {@link Point} value
* will be used as the return value, if possible.
*
* @param rv Return value object to reuse, if possible
*
* @return The component's current location
*/
public Point getLocation(Point rv)
{
if (rv == null)
return new Point(getX(), getY());
rv.setLocation(getX(), getY());
return rv;
}
/**
* Get the component's maximum size. If the maximumSize property
* has been explicitly set, it is returned. If the maximumSize
* property has not been set but the {@link #ui} property has been, the
* result of {@link ComponentUI#getMaximumSize} is returned. If neither
* property has been set, the result of {@link Container#getMaximumSize}
* is returned.
*
* @return the maximum size of the component
*
* @see Component#setMaximumSize
* @see Component#getMaximumSize()
* @see Component#isMaximumSizeSet()
* @see ComponentUI#getMaximumSize(JComponent)
*/
public Dimension getMaximumSize()
{
Dimension size = null;
if (isMaximumSizeSet())
size = super.getMaximumSize();
else
{
if (ui != null)
size = ui.getMaximumSize(this);
if (size == null)
size = super.getMaximumSize();
}
return size;
}
/**
* Get the component's minimum size. If the minimumSize property
* has been explicitly set, it is returned. If the minimumSize
* property has not been set but the {@link #ui} property has been, the
* result of {@link ComponentUI#getMinimumSize} is returned. If neither
* property has been set, the result of {@link Container#getMinimumSize}
* is returned.
*
* @return The minimum size of the component
*
* @see Component#setMinimumSize
* @see Component#getMinimumSize()
* @see Component#isMinimumSizeSet()
* @see ComponentUI#getMinimumSize(JComponent)
*/
public Dimension getMinimumSize()
{
Dimension size = null;
if (isMinimumSizeSet())
size = super.getMinimumSize();
else
{
if (ui != null)
size = ui.getMinimumSize(this);
if (size == null)
size = super.getMinimumSize();
}
return size;
}
/**
* Get the component's preferred size. If the preferredSize
* property has been explicitly set, it is returned. If the
* preferredSize property has not been set but the {@link #ui}
* property has been, the result of {@link ComponentUI#getPreferredSize} is
* returned. If neither property has been set, the result of {@link
* Container#getPreferredSize} is returned.
*
* @return The preferred size of the component
*
* @see Component#setPreferredSize
* @see Component#getPreferredSize()
* @see Component#isPreferredSizeSet()
* @see ComponentUI#getPreferredSize(JComponent)
*/
public Dimension getPreferredSize()
{
Dimension size = null;
if (isPreferredSizeSet())
size = super.getPreferredSize();
else
{
if (ui != null)
size = ui.getPreferredSize(this);
if (size == null)
size = super.getPreferredSize();
}
return size;
}
/**
* Return the value of the nextFocusableComponent property.
*
* @return The current value of the property, or null
* if none has been set.
*
* @deprecated See {@link java.awt.FocusTraversalPolicy}
*/
public Component getNextFocusableComponent()
{
Container focusRoot = this;
if (! this.isFocusCycleRoot())
focusRoot = getFocusCycleRootAncestor();
FocusTraversalPolicy policy = focusRoot.getFocusTraversalPolicy();
return policy.getComponentAfter(focusRoot, this);
}
/**
* Return the set of {@link KeyStroke} objects which are registered
* to initiate actions on this component.
*
* @return An array of the registered keystrokes (possibly empty but never
* null).
*/
public KeyStroke[] getRegisteredKeyStrokes()
{
KeyStroke[] ks0;
KeyStroke[] ks1;
KeyStroke[] ks2;
if (inputMap_whenFocused != null)
ks0 = inputMap_whenFocused.keys();
else
ks0 = new KeyStroke[0];
if (inputMap_whenAncestorOfFocused != null)
ks1 = inputMap_whenAncestorOfFocused.keys();
else
ks1 = new KeyStroke[0];
if (inputMap_whenInFocusedWindow != null)
ks2 = inputMap_whenInFocusedWindow.keys();
else
ks2 = new KeyStroke[0];
int count = ks0.length + ks1.length + ks2.length;
KeyStroke[] result = new KeyStroke[count];
System.arraycopy(ks0, 0, result, 0, ks0.length);
System.arraycopy(ks1, 0, result, ks0.length, ks1.length);
System.arraycopy(ks2, 0, result, ks0.length + ks1.length, ks2.length);
return result;
}
/**
* Returns the first ancestor of this component which is a {@link JRootPane}.
* Equivalent to calling SwingUtilities.getRootPane(this);.
*
* @return An ancestral JRootPane, or null if none exists.
*/
public JRootPane getRootPane()
{
JRootPane p = SwingUtilities.getRootPane(this);
return p;
}
/**
* Get the component's size. The passed-in {@link Dimension} value
* will be used as the return value, if possible.
*
* @param rv Return value object to reuse, if possible
*
* @return The component's current size
*/
public Dimension getSize(Dimension rv)
{
if (rv == null)
return new Dimension(getWidth(), getHeight());
else
{
rv.setSize(getWidth(), getHeight());
return rv;
}
}
/**
* Return the toolTip property of this component, creating it and
* setting it if it is currently null. This method can be
* overridden in subclasses which wish to control the exact form of
* tooltip created.
*
* @return The current toolTip
*/
public JToolTip createToolTip()
{
JToolTip toolTip = new JToolTip();
toolTip.setComponent(this);
return toolTip;
}
/**
* Return the location at which the toolTipText property should
* be displayed, when triggered by a particular mouse event.
*
* @param event The event the tooltip is being presented in response to
*
* @return The point at which to display a tooltip, or null
* if swing is to choose a default location.
*/
public Point getToolTipLocation(MouseEvent event)
{
return null;
}
/**
* Set the tooltip text for this component. If a non-null
* value is set, this component is registered in the
* ToolTipManager in order to turn on tooltips for this
* component. If a null value is set, tooltips are turne off
* for this component.
*
* @param text the tooltip text for this component
*
* @see #getToolTipText()
* @see #getToolTipText(MouseEvent)
*/
public void setToolTipText(String text)
{
String old = getToolTipText();
putClientProperty(TOOL_TIP_TEXT_KEY, text);
ToolTipManager ttm = ToolTipManager.sharedInstance();
if (text == null)
ttm.unregisterComponent(this);
else if (old == null)
ttm.registerComponent(this);
}
/**
* Returns the current tooltip text for this component, or null
* if none has been set.
*
* @return the current tooltip text for this component, or null
* if none has been set
*
* @see #setToolTipText
* @see #getToolTipText(MouseEvent)
*/
public String getToolTipText()
{
return (String) getClientProperty(TOOL_TIP_TEXT_KEY);
}
/**
* Returns the tooltip text for this component for a particular mouse
* event. This can be used to support context sensitive tooltips that can
* change with the mouse location. By default this returns the static
* tooltip text returned by {@link #getToolTipText()}.
*
* @param event the mouse event which triggered the tooltip
*
* @return the tooltip text for this component for a particular mouse
* event
*
* @see #setToolTipText
* @see #getToolTipText()
*/
public String getToolTipText(MouseEvent event)
{
return getToolTipText();
}
/**
* Returns the flag that controls whether or not the component inherits its
* parent's popup menu when no popup menu is specified for this component.
*
* @return A boolean.
*
* @since 1.5
*
* @see #setInheritsPopupMenu(boolean)
*/
public boolean getInheritsPopupMenu()
{
return inheritsPopupMenu;
}
/**
* Sets the flag that controls whether or not the component inherits its
* parent's popup menu when no popup menu is specified for this component.
* This is a bound property with the property name 'inheritsPopupMenu'.
*
* @param inherit the new flag value.
*
* @since 1.5
*
* @see #getInheritsPopupMenu()
*/
public void setInheritsPopupMenu(boolean inherit)
{
if (inheritsPopupMenu != inherit)
{
inheritsPopupMenu = inherit;
this.firePropertyChange("inheritsPopupMenu", ! inherit, inherit);
}
}
/**
* Returns the popup menu for this component. If the popup menu is
* null AND the {@link #getInheritsPopupMenu()} method returns
* true, this method will return the parent's popup menu (if it
* has one).
*
* @return The popup menu (possibly null.
*
* @since 1.5
*
* @see #setComponentPopupMenu(JPopupMenu)
* @see #getInheritsPopupMenu()
*/
public JPopupMenu getComponentPopupMenu()
{
if (componentPopupMenu == null && getInheritsPopupMenu())
{
Container parent = getParent();
if (parent instanceof JComponent)
return ((JComponent) parent).getComponentPopupMenu();
else
return null;
}
else
return componentPopupMenu;
}
/**
* Sets the popup menu for this component (this is a bound property with
* the property name 'componentPopupMenu').
*
* @param popup the popup menu (null permitted).
*
* @since 1.5
*
* @see #getComponentPopupMenu()
*/
public void setComponentPopupMenu(JPopupMenu popup)
{
if (componentPopupMenu != popup)
{
JPopupMenu old = componentPopupMenu;
componentPopupMenu = popup;
firePropertyChange("componentPopupMenu", old, popup);
}
}
/**
* Return the top level ancestral container (usually a {@link
* java.awt.Window} or {@link java.applet.Applet}) which this component is
* contained within, or null if no ancestors exist.
*
* @return The top level container, if it exists
*/
public Container getTopLevelAncestor()
{
Container c = getParent();
for (Container peek = c; peek != null; peek = peek.getParent())
c = peek;
return c;
}
/**
* Compute the component's visible rectangle, which is defined
* recursively as either the component's bounds, if it has no parent, or
* the intersection of the component's bounds with the visible rectangle
* of its parent.
*
* @param rect The return value slot to place the visible rectangle in
*/
public void computeVisibleRect(Rectangle rect)
{
Component c = getParent();
if (c != null && c instanceof JComponent)
{
((JComponent) c).computeVisibleRect(rect);
rect.translate(-getX(), -getY());
rect = SwingUtilities.computeIntersection(0, 0, getWidth(),
getHeight(), rect);
}
else
rect.setRect(0, 0, getWidth(), getHeight());
}
/**
* Return the component's visible rectangle in a new {@link Rectangle},
* rather than via a return slot.
*
* @return the component's visible rectangle
*
* @see #computeVisibleRect(Rectangle)
*/
public Rectangle getVisibleRect()
{
Rectangle r = new Rectangle();
computeVisibleRect(r);
return r;
}
/**
* Requests that this component receive input focus, giving window
* focus to the top level ancestor of this component. Only works on
* displayable, focusable, visible components.
*
* This method should not be called by clients; it is intended for
* focus implementations. Use {@link Component#requestFocus()} instead.
*
* @see Component#requestFocus()
*/
public void grabFocus()
{
requestFocus();
}
/**
* Get the value of the {@link #doubleBuffered} property.
*
* @return The property's current value
*/
public boolean isDoubleBuffered()
{
return doubleBuffered;
}
/**
* Return true if the provided component has no native peer;
* in other words, if it is a "lightweight component".
*
* @param c The component to test for lightweight-ness
*
* @return Whether or not the component is lightweight
*/
public static boolean isLightweightComponent(Component c)
{
return c.getPeer() instanceof LightweightPeer;
}
/**
* Return true if you wish this component to manage its own
* focus. In particular: if you want this component to be sent
* TAB and SHIFT+TAB key events, and to not
* have its children considered as focus transfer targets. If
* true, focus traversal around this component changes to
* CTRL+TAB and CTRL+SHIFT+TAB.
*
* @return true if you want this component to manage its own
* focus, otherwise (by default) false
*
* @deprecated 1.4 Use {@link Component#setFocusTraversalKeys(int, Set)} and
* {@link Container#setFocusCycleRoot(boolean)} instead
*/
public boolean isManagingFocus()
{
return false;
}
/**
* Return the current value of the {@link #opaque} property.
*
* @return The current property value
*/
public boolean isOpaque()
{
return opaque;
}
/**
* Return true if the component can guarantee that none of its
* children will overlap in Z-order. This is a hint to the painting system.
* The default is to return true, but some components such as
* {@link JLayeredPane} should override this to return false.
*
* @return Whether the component tiles its children
*/
public boolean isOptimizedDrawingEnabled()
{
return true;
}
/**
* Return true if this component is currently painting a tile,
* this means that paint() is called again on another child component. This
* method returns false if this component does not paint a tile
* or if the last tile is currently painted.
*
* @return whether the component is painting a tile
*/
public boolean isPaintingTile()
{
return paintingTile;
}
/**
* Get the value of the {@link #requestFocusEnabled} property.
*
* @return The current value of the property
*/
public boolean isRequestFocusEnabled()
{
return requestFocusEnabled;
}
/**
* Return true if this component is a validation root; this
* will cause calls to {@link #invalidate()} in this component's children
* to be "captured" at this component, and not propagate to its parents.
* For most components this should return false, but some
* components such as {@link JViewport} will want to return
* true.
*
* @return Whether this component is a validation root
*/
public boolean isValidateRoot()
{
return false;
}
/**
* Paint the component. This is a delicate process, and should only be
* called from the repaint thread, under control of the {@link
* RepaintManager}. Client code should usually call {@link #repaint()} to
* trigger painting.
*
* The body of the paint call involves calling {@link
* #paintComponent}, {@link #paintBorder}, and {@link #paintChildren} in
* order. If you want to customize painting behavior, you should override
* one of these methods rather than paint.
*
* For more details on the painting sequence, see
* this article.
*
* @param g The graphics context to paint with
*
* @see #paintImmediately(Rectangle)
*/
public void paint(Graphics g)
{
RepaintManager rm = RepaintManager.currentManager(this);
// We do a little stunt act here to switch on double buffering if it's
// not already on. If we are not already doublebuffered, then we jump
// into the method paintDoubleBuffered, which turns on the double buffer
// and then calls paint(g) again. In the second call we go into the else
// branch of this if statement and actually paint things to the double
// buffer. When this method completes, the call stack unwinds back to
// paintDoubleBuffered, where the buffer contents is finally drawn to the
// screen.
if (!paintingDoubleBuffered && isDoubleBuffered()
&& rm.isDoubleBufferingEnabled())
{
Rectangle clip = g.getClipBounds();
paintDoubleBuffered(clip.x, clip.y, clip.width, clip.height);
}
else
{
if (getClientProperty("bufferedDragging") != null
&& dragBuffer == null)
{
initializeDragBuffer();
}
else if (getClientProperty("bufferedDragging") == null
&& dragBuffer != null)
{
dragBuffer = null;
}
Rectangle clip = g.getClipBounds();
int clipX, clipY, clipW, clipH;
if (clip == null)
{
clipX = 0;
clipY = 0;
clipW = getWidth();
clipH = getHeight();
}
else
{
clipX = clip.x;
clipY = clip.y;
clipW = clip.width;
clipH = clip.height;
}
if (dragBuffer != null && dragBufferInitialized)
{
g.drawImage(dragBuffer, 0, 0, this);
}
else
{
Graphics g2 = getComponentGraphics(g);
if (! isOccupiedByChild(clipX, clipY, clipW, clipH))
{
paintComponent(g2);
paintBorder(g2);
}
paintChildren(g2);
}
}
}
/**
* Determines if a region of this component is completely occupied by
* an opaque child component, in which case we don't need to bother
* painting this component at all.
*
* @param x the area, x coordinate
* @param y the area, y coordinate
* @param w the area, width
* @param h the area, height
*
* @return true if the specified area is completely covered
* by a child component, false otherwise
*/
private boolean isOccupiedByChild(int x, int y, int w, int h)
{
boolean occupied = false;
int count = getComponentCount();
for (int i = 0; i < count; i++)
{
Component child = getComponent(i);
int cx = child.getX();
int cy = child.getY();
int cw = child.getWidth();
int ch = child.getHeight();
if (child.isVisible() && x >= cx && x + w <= cx + cw && y >= cy
&& y + h <= cy + ch)
{
occupied = child.isOpaque();
break;
}
}
return occupied;
}
/**
* Initializes the drag buffer by creating a new image and painting this
* component into it.
*/
private void initializeDragBuffer()
{
dragBufferInitialized = false;
// Allocate new dragBuffer if the current one is too small.
if (dragBuffer == null || dragBuffer.getWidth(this) < getWidth()
|| dragBuffer.getHeight(this) < getHeight())
{
dragBuffer = createImage(getWidth(), getHeight());
}
Graphics g = dragBuffer.getGraphics();
paint(g);
g.dispose();
dragBufferInitialized = true;
}
/**
* Paint the component's border. This usually means calling {@link
* Border#paintBorder} on the {@link #border} property, if it is
* non-null. You may override this if you wish to customize
* border painting behavior. The border is painted after the component's
* body, but before the component's children.
*
* @param g The graphics context with which to paint the border
*
* @see #paint
* @see #paintChildren
* @see #paintComponent
*/
protected void paintBorder(Graphics g)
{
if (getBorder() != null)
getBorder().paintBorder(this, g, 0, 0, getWidth(), getHeight());
}
/**
* Paint the component's children. This usually means calling {@link
* Container#paint}, which recursively calls {@link #paint} on any of the
* component's children, with appropriate changes to coordinate space and
* clipping region. You may override this if you wish to customize
* children painting behavior. The children are painted after the
* component's body and border.
*
* @param g The graphics context with which to paint the children
*
* @see #paint
* @see #paintBorder
* @see #paintComponent
*/
protected void paintChildren(Graphics g)
{
if (getComponentCount() > 0)
{
// Need to lock the tree to avoid problems with AWT and concurrency.
synchronized (getTreeLock())
{
// Fast forward to the child to paint, if set by
// paintImmediately2()
int i = getComponentCount() - 1;
if (paintChild != null && paintChild.isOpaque())
{
for (; i >= 0 && getComponent(i) != paintChild; i--);
}
for (; i >= 0; i--)
{
Component child = getComponent(i);
if (child != null && child.isLightweight()
&& child.isVisible())
{
int cx = child.getX();
int cy = child.getY();
int cw = child.getWidth();
int ch = child.getHeight();
if (g.hitClip(cx, cy, cw, ch))
{
if ((! isOptimizedDrawingEnabled()) && i > 0)
{
// Check if the child is completely obscured.
Rectangle clip = g.getClipBounds(); // A copy.
SwingUtilities.computeIntersection(cx, cy, cw, ch,
clip);
if (isCompletelyObscured(i, clip.x, clip.y,
clip.width, clip.height))
continue; // Continues the for-loop.
}
Graphics cg = g.create(cx, cy, cw, ch);
cg.setColor(child.getForeground());
cg.setFont(child.getFont());
try
{
child.paint(cg);
}
finally
{
cg.dispose();
}
}
}
}
}
}
}
/**
* Determines if a region of a child component is completely obscured by one
* of its siblings.
*
* @param index the index of the child component
* @param x the region to check, x coordinate
* @param y the region to check, y coordinate
* @param w the region to check, width
* @param h the region to check, height
*
* @return true if the region is completely obscured by a
* sibling, false otherwise
*/
private boolean isCompletelyObscured(int index, int x, int y, int w, int h)
{
boolean obscured = false;
for (int i = index - 1; i >= 0 && obscured == false; i--)
{
Component sib = getComponent(i);
if (sib.isVisible())
{
Rectangle sibRect = sib.getBounds(rectCache);
if (sib.isOpaque() && x >= sibRect.x
&& (x + w) <= (sibRect.x + sibRect.width)
&& y >= sibRect.y
&& (y + h) <= (sibRect.y + sibRect.height))
{
obscured = true;
}
}
}
return obscured;
}
/**
* Checks if a component/rectangle is partially obscured by one of its
* siblings.
* Note that this doesn't check for completely obscured, this is
* done by isCompletelyObscured() and should probably also be checked.
*
* @param i the component index from which to start searching
* @param x the x coordinate of the rectangle to check
* @param y the y coordinate of the rectangle to check
* @param w the width of the rectangle to check
* @param h the height of the rectangle to check
*
* @return true if the rectangle is partially obscured
*/
private boolean isPartiallyObscured(int i, int x, int y, int w, int h)
{
boolean obscured = false;
for (int j = i - 1; j >= 0 && ! obscured; j--)
{
Component sibl = getComponent(j);
if (sibl.isVisible())
{
Rectangle rect = sibl.getBounds(rectCache);
if (!(x + w <= rect.x)
|| (y + h <= rect.y)
|| (x >= rect.x + rect.width)
|| (y >= rect.y + rect.height))
obscured = true;
}
}
return obscured;
}
/**
* Paint the component's body. This usually means calling {@link
* ComponentUI#update} on the {@link #ui} property of the component, if
* it is non-null. You may override this if you wish to
* customize the component's body-painting behavior. The component's body
* is painted first, before the border and children.
*
* @param g The graphics context with which to paint the body
*
* @see #paint
* @see #paintBorder
* @see #paintChildren
*/
protected void paintComponent(Graphics g)
{
if (ui != null)
{
Graphics g2 = g.create();
try
{
ui.update(g2, this);
}
finally
{
g2.dispose();
}
}
}
/**
* A variant of {@link #paintImmediately(Rectangle)} which takes
* integer parameters.
*
* @param x The left x coordinate of the dirty region
* @param y The top y coordinate of the dirty region
* @param w The width of the dirty region
* @param h The height of the dirty region
*/
public void paintImmediately(int x, int y, int w, int h)
{
// Find opaque parent and call paintImmediately2() on it.
if (isShowing())
{
Component c = this;
Component p;
while (c != null && ! c.isOpaque())
{
p = c.getParent();
if (p != null)
{
x += c.getX();
y += c.getY();
c = p;
}
}
if (c instanceof JComponent)
((JComponent) c).paintImmediately2(x, y, w, h);
else
c.repaint(x, y, w, h);
}
}
/**
* Transform the provided dirty rectangle for this component into the
* appropriate ancestral {@link JRootPane} and call {@link #paint} on
* that root pane. This method is called from the {@link RepaintManager}
* and should always be called within the painting thread.
*
* This method will acquire a double buffer from the {@link
* RepaintManager} if the component's {@link #doubleBuffered} property is
* true and the paint call is the
* first recursive paint call inside swing.
*
* The method will also modify the provided {@link Graphics} context
* via the {@link #getComponentGraphics} method. If you want to customize
* the graphics object used for painting, you should override that method
* rather than paint.
*
* @param r The dirty rectangle to paint
*/
public void paintImmediately(Rectangle r)
{
paintImmediately(r.x, r.y, r.width, r.height);
}
/**
* Performs the actual work of paintImmediatly on the repaint root.
*
* @param x the area to be repainted, X coordinate
* @param y the area to be repainted, Y coordinate
*/
void paintImmediately2(int x, int y, int w, int h)
{
// Optimization for components that are always painted on top.
boolean onTop = onTop() && isOpaque();
// Fetch the RepaintManager.
RepaintManager rm = RepaintManager.currentManager(this);
// The painting clip;
int paintX = x;
int paintY = y;
int paintW = w;
int paintH = h;
// If we should paint buffered or not.
boolean haveBuffer = false;
// The component that is finally triggered for painting.
JComponent paintRoot = this;
// Stores the component and all its parents. This will be used to limit
// the actually painted components in paintChildren by setting
// the field paintChild.
int pIndex = -1;
int pCount = 0;
ArrayList components = new ArrayList();
// Offset to subtract from the paintRoot rectangle when painting.
int offsX = 0;
int offsY = 0;
// The current component and its child.
Component child;
Container c;
// Find appropriate paint root.
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;
components.add(c);
if (! onTop && jc != null && ! jc.isOptimizedDrawingEnabled())
{
// Indicates whether we reset the paint root to be the current
// component.
boolean updatePaintRoot = false;
// Check obscured state of the child.
// Generally, we have 3 cases here:
// 1. Not obscured. No need to paint from the parent.
// 2. Partially obscured. Paint from the parent.
// 3. Completely obscured. No need to paint anything.
if (c != this)
{
if (jc.isPaintRoot())
updatePaintRoot = true;
else
{
int count = c.getComponentCount();
int i = 0;
for (; i < count && c.getComponent(i) != child; i++);
if (jc.isCompletelyObscured(i, paintX, paintY, paintW,
paintH))
return; // No need to paint anything.
else if (jc.isPartiallyObscured(i, paintX, paintY, paintW,
paintH))
updatePaintRoot = true;
}
}
if (updatePaintRoot)
{
// Paint from parent.
paintRoot = jc;
pIndex = pCount;
offsX = 0;
offsY = 0;
haveBuffer = false;
}
}
pCount++;
// Check if component is double buffered.
if (rm.isDoubleBufferingEnabled() && jc != null
&& jc.isDoubleBuffered())
{
haveBuffer = true;
}
// Clip the paint region with the parent.
if (! onTop)
{
paintX = Math.max(0, paintX);
paintY = Math.max(0, paintY);
paintW = Math.min(c.getWidth(), paintW + paintX) - paintX;
paintH = Math.min(c.getHeight(), paintH + paintY) - paintY;
int dx = c.getX();
int dy = c.getY();
paintX += dx;
paintY += dy;
offsX += dx;
offsY += dy;
}
}
if (c != null && c.getPeer() != null && paintW > 0 && paintH > 0)
{
isRepainting = true;
paintX -= offsX;
paintY -= offsY;
// Set the painting path so that paintChildren paints only what we
// want.
if (paintRoot != this)
{
for (int i = pIndex; i > 0; i--)
{
Component paintParent = (Component) components.get(i);
if (paintParent instanceof JComponent)
((JComponent) paintParent).paintChild =
(Component) components.get(i - 1);
}
}
// Actually trigger painting.
if (haveBuffer)
paintRoot.paintDoubleBuffered(paintX, paintY, paintW, paintH);
else
{
Graphics g = paintRoot.getGraphics();
try
{
g.setClip(paintX, paintY, paintW, paintH);
paintRoot.paint(g);
}
finally
{
g.dispose();
}
}
// Reset the painting path.
if (paintRoot != this)
{
for (int i = pIndex; i > 0; i--)
{
Component paintParent = (Component) components.get(i);
if (paintParent instanceof JComponent)
((JComponent) paintParent).paintChild = null;
}
}
isRepainting = false;
}
}
/**
* Returns true if the component is guaranteed to be painted
* on top of others. This returns false by default and is overridden by
* components like JMenuItem, JPopupMenu and JToolTip to return true for
* added efficiency.
*
* @return true if the component is guaranteed to be painted
* on top of others
*/
boolean onTop()
{
return false;
}
/**
* This returns true when a component needs to force itself as a paint
* origin. This is used for example in JViewport to make sure that it
* gets to update its backbuffer.
*
* @return true when a component needs to force itself as a paint
* origin
*/
boolean isPaintRoot()
{
return false;
}
/**
* Performs double buffered repainting.
*/
private void paintDoubleBuffered(int x, int y, int w, int h)
{
RepaintManager rm = RepaintManager.currentManager(this);
// Paint on the offscreen buffer.
Component root = SwingUtilities.getRoot(this);
Image buffer = rm.getVolatileOffscreenBuffer(this, root.getWidth(),
root.getHeight());
// The volatile offscreen buffer may be null when that's not supported
// by the AWT backend. Fall back to normal backbuffer in this case.
if (buffer == null)
buffer = rm.getOffscreenBuffer(this, root.getWidth(), root.getHeight());
//Rectangle targetClip = SwingUtilities.convertRectangle(this, r, root);
Graphics g2 = buffer.getGraphics();
clipAndTranslateGraphics(root, this, g2);
g2.clipRect(x, y, w, h);
g2 = getComponentGraphics(g2);
paintingDoubleBuffered = true;
try
{
if (isRepainting) // Called from paintImmediately, go through paint().
paint(g2);
else // Called from paint() (AWT refresh), don't call it again.
{
paintComponent(g2);
paintBorder(g2);
paintChildren(g2);
}
}
finally
{
paintingDoubleBuffered = false;
g2.dispose();
}
// Paint the buffer contents on screen.
rm.commitBuffer(this, x, y, w, h);
}
/**
* Clips and translates the Graphics instance for painting on the double
* buffer. This has to be done, so that it reflects the component clip of the
* target component.
*
* @param root the root component (top-level container usually)
* @param target the component to be painted
* @param g the Graphics instance
*/
private void clipAndTranslateGraphics(Component root, Component target,
Graphics g)
{
Component parent = target;
int deltaX = 0;
int deltaY = 0;
while (parent != root)
{
deltaX += parent.getX();
deltaY += parent.getY();
parent = parent.getParent();
}
g.translate(deltaX, deltaY);
g.clipRect(0, 0, target.getWidth(), target.getHeight());
}
/**
* Performs normal painting without double buffering.
*
* @param r the area that should be repainted
*/
void paintSimple(Rectangle r)
{
Graphics g = getGraphics();
Graphics g2 = getComponentGraphics(g);
g2.setClip(r);
paint(g2);
g2.dispose();
if (g != g2)
g.dispose();
}
/**
* Return a string representation for this component, for use in
* debugging.
*
* @return A string describing this component.
*/
protected String paramString()
{
StringBuffer sb = new StringBuffer();
sb.append(super.paramString());
sb.append(",alignmentX=").append(getAlignmentX());
sb.append(",alignmentY=").append(getAlignmentY());
sb.append(",border=");
if (getBorder() != null)
sb.append(getBorder());
sb.append(",maximumSize=");
if (getMaximumSize() != null)
sb.append(getMaximumSize());
sb.append(",minimumSize=");
if (getMinimumSize() != null)
sb.append(getMinimumSize());
sb.append(",preferredSize=");
if (getPreferredSize() != null)
sb.append(getPreferredSize());
return sb.toString();
}
/**
* A variant of {@link
* #registerKeyboardAction(ActionListener,String,KeyStroke,int)} which
* provides null for the command name.
*
* @param act the action listener to notify when the keystroke occurs.
* @param stroke the key stroke.
* @param cond the condition (one of {@link #WHEN_FOCUSED},
* {@link #WHEN_IN_FOCUSED_WINDOW} and
* {@link #WHEN_ANCESTOR_OF_FOCUSED_COMPONENT}).
*/
public void registerKeyboardAction(ActionListener act,
KeyStroke stroke,
int cond)
{
registerKeyboardAction(act, null, stroke, cond);
}
/*
* There is some charmingly undocumented behavior sun seems to be using
* to simulate the old register/unregister keyboard binding API. It's not
* clear to me why this matters, but we shall endeavour to follow suit.
*
* Two main thing seem to be happening when you do registerKeyboardAction():
*
* - no actionMap() entry gets created, just an entry in inputMap()
*
* - the inputMap() entry is a proxy class which invokes the the
* binding's actionListener as a target, and which clobbers the command
* name sent in the ActionEvent, providing the binding command name
* instead.
*
* This much you can work out just by asking the input and action maps
* what they contain after making bindings, and watching the event which
* gets delivered to the recipient. Beyond that, it seems to be a
* sun-private solution so I will only immitate it as much as it matters
* to external observers.
*/
private static class ActionListenerProxy
extends AbstractAction
{
ActionListener target;
String bindingCommandName;
public ActionListenerProxy(ActionListener li,
String cmd)
{
target = li;
bindingCommandName = cmd;
}
public void actionPerformed(ActionEvent e)
{
ActionEvent derivedEvent = new ActionEvent(e.getSource(),
e.getID(),
bindingCommandName,
e.getModifiers());
target.actionPerformed(derivedEvent);
}
}
/**
* An obsolete method to register a keyboard action on this component.
* You should use getInputMap and getActionMap
* to fetch mapping tables from keystrokes to commands, and commands to
* actions, respectively, and modify those mappings directly.
*
* @param act The action to be registered
* @param cmd The command to deliver in the delivered {@link
* java.awt.event.ActionEvent}
* @param stroke The keystroke to register on
* @param cond One of the values {@link #UNDEFINED_CONDITION},
* {@link #WHEN_ANCESTOR_OF_FOCUSED_COMPONENT}, {@link #WHEN_FOCUSED}, or
* {@link #WHEN_IN_FOCUSED_WINDOW}, indicating the condition which must
* be met for the action to be fired
*
* @see #unregisterKeyboardAction
* @see #getConditionForKeyStroke
* @see #resetKeyboardActions
*/
public void registerKeyboardAction(ActionListener act,
String cmd,
KeyStroke stroke,
int cond)
{
ActionListenerProxy proxy = new ActionListenerProxy(act, cmd);
getInputMap(cond).put(stroke, proxy);
getActionMap().put(proxy, proxy);
}
/**
* Sets the input map for the given condition.
*
* @param condition the condition (one of {@link #WHEN_FOCUSED},
* {@link #WHEN_IN_FOCUSED_WINDOW} and
* {@link #WHEN_ANCESTOR_OF_FOCUSED_COMPONENT}).
* @param map the map.
*
* @throws IllegalArgumentException if condition is not one of
* the specified values.
*/
public final void setInputMap(int condition, InputMap map)
{
enableEvents(AWTEvent.KEY_EVENT_MASK);
switch (condition)
{
case WHEN_FOCUSED:
inputMap_whenFocused = map;
break;
case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
inputMap_whenAncestorOfFocused = map;
break;
case WHEN_IN_FOCUSED_WINDOW:
if (map != null && !(map instanceof ComponentInputMap))
throw new
IllegalArgumentException("WHEN_IN_FOCUSED_WINDOW " +
"InputMap must be a ComponentInputMap");
inputMap_whenInFocusedWindow = (ComponentInputMap)map;
break;
case UNDEFINED_CONDITION:
default:
throw new IllegalArgumentException();
}
}
/**
* Returns the input map associated with this component for the given
* state/condition.
*
* @param condition the state (one of {@link #WHEN_FOCUSED},
* {@link #WHEN_ANCESTOR_OF_FOCUSED_COMPONENT} and
* {@link #WHEN_IN_FOCUSED_WINDOW}).
*
* @return The input map.
* @throws IllegalArgumentException if condition is not one of
* the specified values.
* @since 1.3
*/
public final InputMap getInputMap(int condition)
{
enableEvents(AWTEvent.KEY_EVENT_MASK);
switch (condition)
{
case WHEN_FOCUSED:
if (inputMap_whenFocused == null)
inputMap_whenFocused = new InputMap();
return inputMap_whenFocused;
case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
if (inputMap_whenAncestorOfFocused == null)
inputMap_whenAncestorOfFocused = new InputMap();
return inputMap_whenAncestorOfFocused;
case WHEN_IN_FOCUSED_WINDOW:
if (inputMap_whenInFocusedWindow == null)
inputMap_whenInFocusedWindow = new ComponentInputMap(this);
return inputMap_whenInFocusedWindow;
case UNDEFINED_CONDITION:
default:
throw new IllegalArgumentException("Invalid 'condition' argument: "
+ condition);
}
}
/**
* Returns the input map associated with this component for the
* {@link #WHEN_FOCUSED} state.
*
* @return The input map.
*
* @since 1.3
* @see #getInputMap(int)
*/
public final InputMap getInputMap()
{
return getInputMap(WHEN_FOCUSED);
}
public final ActionMap getActionMap()
{
if (actionMap == null)
actionMap = new ActionMap();
return actionMap;
}
public final void setActionMap(ActionMap map)
{
actionMap = map;
}
/**
* Return the condition that determines whether a registered action
* occurs in response to the specified keystroke.
*
* As of 1.3 KeyStrokes can be registered with multiple simultaneous
* conditions.
*
* @param ks The keystroke to return the condition of
*
* @return One of the values {@link #UNDEFINED_CONDITION}, {@link
* #WHEN_ANCESTOR_OF_FOCUSED_COMPONENT}, {@link #WHEN_FOCUSED}, or {@link
* #WHEN_IN_FOCUSED_WINDOW}
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
* @see #unregisterKeyboardAction
* @see #resetKeyboardActions
*/
public int getConditionForKeyStroke(KeyStroke ks)
{
if (inputMap_whenFocused != null
&& inputMap_whenFocused.get(ks) != null)
return WHEN_FOCUSED;
else if (inputMap_whenAncestorOfFocused != null
&& inputMap_whenAncestorOfFocused.get(ks) != null)
return WHEN_ANCESTOR_OF_FOCUSED_COMPONENT;
else if (inputMap_whenInFocusedWindow != null
&& inputMap_whenInFocusedWindow.get(ks) != null)
return WHEN_IN_FOCUSED_WINDOW;
else
return UNDEFINED_CONDITION;
}
/**
* Get the ActionListener (typically an {@link Action} object) which is
* associated with a particular keystroke.
*
* @param ks The keystroke to retrieve the action of
*
* @return The action associated with the specified keystroke
*/
public ActionListener getActionForKeyStroke(KeyStroke ks)
{
Object key = getInputMap(JComponent.WHEN_FOCUSED).get(ks);
if (key == null)
key = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).get(ks);
if (key == null)
key = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).get(ks);
if (key != null)
{
if (key instanceof ActionListenerProxy)
return ((ActionListenerProxy) key).target;
else
return getActionMap().get(key);
}
return null;
}
/**
* A hook for subclasses which want to customize event processing.
*/
protected void processComponentKeyEvent(KeyEvent e)
{
// This method does nothing, it is meant to be overridden by subclasses.
}
/**
* Override the default key dispatch system from Component to hook into
* the swing {@link InputMap} / {@link ActionMap} system.
*
* See
* this report for more details, it's somewhat complex.
*/
protected void processKeyEvent(KeyEvent e)
{
// let the AWT event processing send KeyEvents to registered listeners
super.processKeyEvent(e);
processComponentKeyEvent(e);
if (e.isConsumed())
return;
// Input maps are checked in this order:
// 1. The focused component's WHEN_FOCUSED map is checked.
// 2. The focused component's WHEN_ANCESTOR_OF_FOCUSED_COMPONENT map.
// 3. The WHEN_ANCESTOR_OF_FOCUSED_COMPONENT maps of the focused
// component's parent, then its parent's parent, and so on.
// Note: Input maps for disabled components are skipped.
// 4. The WHEN_IN_FOCUSED_WINDOW maps of all the enabled components in
// the focused window are searched.
KeyStroke keyStroke = KeyStroke.getKeyStrokeForEvent(e);
boolean pressed = e.getID() == KeyEvent.KEY_PRESSED;
if (processKeyBinding(keyStroke, e, WHEN_FOCUSED, pressed))
{
// This is step 1 from above comment.
e.consume();
return;
}
else if (processKeyBinding
(keyStroke, e, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
{
// This is step 2 from above comment.
e.consume();
return;
}
// This is step 3 from above comment.
Container current = getParent();
while (current != null)
{
// If current is a JComponent, see if it handles the event in its
// WHEN_ANCESTOR_OF_FOCUSED_COMPONENT maps.
if ((current instanceof JComponent) &&
((JComponent)current).processKeyBinding
(keyStroke, e,WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed))
{
e.consume();
return;
}
// Stop when we've tried a top-level container and it didn't handle it
if (current instanceof Window || current instanceof Applet)
break;
// Move up the hierarchy
current = current.getParent();
}
// Current being null means the JComponent does not currently have a
// top-level ancestor, in which case we don't need to check
// WHEN_IN_FOCUSED_WINDOW bindings.
if (current == null || e.isConsumed())
return;
// This is step 4 from above comment. KeyboardManager maintains mappings
// related to WHEN_IN_FOCUSED_WINDOW bindings so that we don't have to
// traverse the containment hierarchy each time.
if (KeyboardManager.getManager().processKeyStroke(current, keyStroke, e))
e.consume();
}
protected boolean processKeyBinding(KeyStroke ks,
KeyEvent e,
int condition,
boolean pressed)
{
if (isEnabled())
{
Action act = null;
Object cmd = null;
InputMap map = getInputMap(condition);
if (map != null)
{
cmd = map.get(ks);
if (cmd != null)
{
if (cmd instanceof ActionListenerProxy)
act = (Action) cmd;
else
act = getActionMap().get(cmd);
}
}
if (act != null && act.isEnabled())
{
// Need to synchronize here so we don't get in trouble with
// our __command__ hack.
synchronized (act)
{
// We add the command as value to the action, so that
// the action can later determine the command with which it
// was called. This is undocumented, but shouldn't affect
// compatibility. It allows us to use only one Action instance
// to do the work for all components of one type, instead of
// having loads of small Actions. This effectivly saves startup
// time of Swing.
act.putValue("__command__", cmd);
return SwingUtilities.notifyAction(act, ks, e, this,
e.getModifiers());
}
}
}
return false;
}
/**
* Remove a keyboard action registry.
*
* @param aKeyStroke The keystroke to unregister
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
* @see #getConditionForKeyStroke
* @see #resetKeyboardActions
*/
public void unregisterKeyboardAction(KeyStroke aKeyStroke)
{
ActionMap am = getActionMap();
// This loops through the conditions WHEN_FOCUSED,
// WHEN_ANCESTOR_OF_FOCUSED_COMPONENT and WHEN_IN_FOCUSED_WINDOW.
for (int cond = 0; cond < 3; cond++)
{
InputMap im = getInputMap(cond);
if (im != null)
{
Object action = im.get(aKeyStroke);
if (action != null && am != null)
am.remove(action);
im.remove(aKeyStroke);
}
}
}
/**
* Reset all keyboard action registries.
*
* @see #registerKeyboardAction(ActionListener, KeyStroke, int)
* @see #unregisterKeyboardAction
* @see #getConditionForKeyStroke
*/
public void resetKeyboardActions()
{
if (inputMap_whenFocused != null)
inputMap_whenFocused.clear();
if (inputMap_whenAncestorOfFocused != null)
inputMap_whenAncestorOfFocused.clear();
if (inputMap_whenInFocusedWindow != null)
inputMap_whenInFocusedWindow.clear();
if (actionMap != null)
actionMap.clear();
}
/**
* Mark the described region of this component as dirty in the current
* {@link RepaintManager}. This will queue an asynchronous repaint using
* the system painting thread in the near future.
*
* @param tm ignored
* @param x coordinate of the region to mark as dirty
* @param y coordinate of the region to mark as dirty
* @param width dimension of the region to mark as dirty
* @param height dimension of the region to mark as dirty
*/
public void repaint(long tm, int x, int y, int width, int height)
{
RepaintManager.currentManager(this).addDirtyRegion(this, x, y, width,
height);
}
/**
* Mark the described region of this component as dirty in the current
* {@link RepaintManager}. This will queue an asynchronous repaint using
* the system painting thread in the near future.
*
* @param r The rectangle to mark as dirty
*/
public void repaint(Rectangle r)
{
RepaintManager.currentManager(this).addDirtyRegion(this, r.x, r.y, r.width,
r.height);
}
/**
* Request focus on the default component of this component's {@link
* FocusTraversalPolicy}.
*
* @return The result of {@link #requestFocus()}
*
* @deprecated Use {@link #requestFocus()} on the default component provided
* from the {@link FocusTraversalPolicy} instead.
*/
public boolean requestDefaultFocus()
{
return false;
}
/**
* Queue a an invalidation and revalidation of this component, using
* {@link RepaintManager#addInvalidComponent}.
*/
public void revalidate()
{
// As long as we don't have a parent we don't need to do any layout, since
// this is done anyway as soon as we get connected to a parent.
if (getParent() == null)
return;
if (! EventQueue.isDispatchThread())
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
revalidate();
}
});
else
{
invalidate();
RepaintManager.currentManager(this).addInvalidComponent(this);
}
}
/**
* Calls scrollRectToVisible on the component's parent.
* Components which can service this call should override.
*
* @param r The rectangle to make visible
*/
public void scrollRectToVisible(Rectangle r)
{
// Search nearest JComponent.
int xOffs = getX();
int yOffs = getY();
Component p;
for (p = getParent(); p != null && ! (p instanceof JComponent);
p = p.getParent())
{
xOffs += p.getX();
yOffs += p.getY();
}
if (p != null)
{
r.x += xOffs;
r.y += yOffs;
JComponent jParent = (JComponent) p;
jParent.scrollRectToVisible(r);
r.x -= xOffs;
r.y -= yOffs;
}
}
/**
* Set the value of the {@link #alignmentX} property.
*
* @param a The new value of the property
*/
public void setAlignmentX(float a)
{
if (a < 0.0F)
alignmentX = 0.0F;
else if (a > 1.0)
alignmentX = 1.0F;
else
alignmentX = a;
}
/**
* Set the value of the {@link #alignmentY} property.
*
* @param a The new value of the property
*/
public void setAlignmentY(float a)
{
if (a < 0.0F)
alignmentY = 0.0F;
else if (a > 1.0)
alignmentY = 1.0F;
else
alignmentY = a;
}
/**
* Set the value of the {@link #autoscrolls} property.
*
* @param a The new value of the property
*/
public void setAutoscrolls(boolean a)
{
autoscrolls = a;
clientAutoscrollsSet = true;
}
/**
* Set the value of the {@link #debugGraphicsOptions} property.
*
* @param debugOptions The new value of the property
*/
public void setDebugGraphicsOptions(int debugOptions)
{
debugGraphicsOptions = debugOptions;
}
/**
* Set the value of the {@link #doubleBuffered} property.
*
* @param db The new value of the property
*/
public void setDoubleBuffered(boolean db)
{
doubleBuffered = db;
}
/**
* Set the value of the enabled property.
*
* @param enable The new value of the property
*/
public void setEnabled(boolean enable)
{
if (enable == isEnabled())
return;
super.setEnabled(enable);
firePropertyChange("enabled", !enable, enable);
repaint();
}
/**
* Set the value of the font property.
*
* @param f The new value of the property
*/
public void setFont(Font f)
{
if (f == getFont())
return;
super.setFont(f);
revalidate();
repaint();
}
/**
* Set the value of the background property.
*
* @param bg The new value of the property
*/
public void setBackground(Color bg)
{
if (bg == getBackground())
return;
super.setBackground(bg);
repaint();
}
/**
* Set the value of the foreground property.
*
* @param fg The new value of the property
*/
public void setForeground(Color fg)
{
if (fg == getForeground())
return;
super.setForeground(fg);
repaint();
}
/**
* Set the specified component to be the next component in the
* focus cycle, overriding the {@link FocusTraversalPolicy} for
* this component.
*
* @param aComponent The component to set as the next focusable
*
* @deprecated Use FocusTraversalPolicy instead
*/
public void setNextFocusableComponent(Component aComponent)
{
Container focusRoot = this;
if (! this.isFocusCycleRoot())
focusRoot = getFocusCycleRootAncestor();
FocusTraversalPolicy policy = focusRoot.getFocusTraversalPolicy();
if (policy instanceof CompatibilityFocusTraversalPolicy)
{
policy = new CompatibilityFocusTraversalPolicy(policy);
focusRoot.setFocusTraversalPolicy(policy);
}
CompatibilityFocusTraversalPolicy p =
(CompatibilityFocusTraversalPolicy) policy;
Component old = getNextFocusableComponent();
if (old != null)
{
p.removeNextFocusableComponent(this, old);
}
if (aComponent != null)
{
p.addNextFocusableComponent(this, aComponent);
}
}
/**
* Set the value of the {@link #requestFocusEnabled} property.
*
* @param e The new value of the property
*/
public void setRequestFocusEnabled(boolean e)
{
requestFocusEnabled = e;
}
/**
* Get the value of the {@link #transferHandler} property.
*
* @return The current value of the property
*
* @see #setTransferHandler
*/
public TransferHandler getTransferHandler()
{
return transferHandler;
}
/**
* Set the value of the {@link #transferHandler} property.
*
* @param newHandler The new value of the property
*
* @see #getTransferHandler
*/
public void setTransferHandler(TransferHandler newHandler)
{
if (transferHandler == newHandler)
return;
TransferHandler oldHandler = transferHandler;
transferHandler = newHandler;
firePropertyChange("transferHandler", oldHandler, newHandler);
}
/**
* Set if the component should paint all pixels withing its bounds.
* If this property is set to false, the component expects the cleared
* background.
*
* @param isOpaque if true, paint all pixels. If false, expect the clean
* background.
*
* @see ComponentUI#update
*/
public void setOpaque(boolean isOpaque)
{
boolean oldOpaque = opaque;
opaque = isOpaque;
clientOpaqueSet = true;
firePropertyChange("opaque", oldOpaque, opaque);
}
/**
* Set the value of the visible property.
*
* If the value is changed, then the AncestorListeners of this component
* and all its children (recursivly) are notified.
*
* @param v The new value of the property
*/
public void setVisible(boolean v)
{
// No need to do anything if the actual value doesn't change.
if (isVisible() == v)
return;
super.setVisible(v);
// Notify AncestorListeners.
if (v == true)
fireAncestorEvent(this, AncestorEvent.ANCESTOR_ADDED);
else
fireAncestorEvent(this, AncestorEvent.ANCESTOR_REMOVED);
Container parent = getParent();
if (parent != null)
parent.repaint(getX(), getY(), getWidth(), getHeight());
revalidate();
}
/**
* Call {@link #paint}.
*
* @param g The graphics context to paint into
*/
public void update(Graphics g)
{
paint(g);
}
/**
* Get the value of the UIClassID property. This property should be a key
* in the {@link UIDefaults} table managed by {@link UIManager}, the
* value of which is the name of a class to load for the component's
* {@link #ui} property.
*
* @return A "symbolic" name which will map to a class to use for the
* component's UI, such as "ComponentUI"
*
* @see #setUI
* @see #updateUI
*/
public String getUIClassID()
{
return "ComponentUI";
}
/**
* Install a new UI delegate as the component's {@link #ui} property. In
* the process, this will call {@link ComponentUI#uninstallUI} on any
* existing value for the {@link #ui} property, and {@link
* ComponentUI#installUI} on the new UI delegate.
*
* @param newUI The new UI delegate to install
*
* @see #updateUI
* @see #getUIClassID
*/
protected void setUI(ComponentUI newUI)
{
if (ui != null)
ui.uninstallUI(this);
ComponentUI oldUI = ui;
ui = newUI;
if (ui != null)
ui.installUI(this);
firePropertyChange("UI", oldUI, newUI);
revalidate();
repaint();
}
/**
* This method should be overridden in subclasses. In JComponent, the
* method does nothing. In subclasses, it should a UI delegate
* (corresponding to the symbolic name returned from {@link
* #getUIClassID}) from the {@link UIManager}, and calls {@link #setUI}
* with the new delegate.
*/
public void updateUI()
{
// Nothing to do here.
}
/**
* Returns the locale used as the default for all new components. The
* default value is {@link Locale#getDefault()} (that is, the platform
* default locale).
*
* @return The locale (never null).
*
* @see #setDefaultLocale(Locale)
*/
public static Locale getDefaultLocale()
{
if (defaultLocale == null)
defaultLocale = Locale.getDefault();
return defaultLocale;
}
/**
* Sets the locale to be used as the default for all new components. If this
* is set to null, the {@link #getDefaultLocale()} method will
* return the platform default locale.
*
* @param l the locale (null permitted).
*/
public static void setDefaultLocale(Locale l)
{
defaultLocale = l;
}
/**
* Returns the currently set input verifier for this component.
*
* @return the input verifier, or null if none
*/
public InputVerifier getInputVerifier()
{
return inputVerifier;
}
/**
* Sets the input verifier to use by this component.
*
* @param verifier the input verifier, or null
*/
public void setInputVerifier(InputVerifier verifier)
{
InputVerifier oldVerifier = inputVerifier;
inputVerifier = verifier;
firePropertyChange("inputVerifier", oldVerifier, verifier);
}
/**
* @since 1.3
*/
public boolean getVerifyInputWhenFocusTarget()
{
return verifyInputWhenFocusTarget;
}
/**
* @since 1.3
*/
public void setVerifyInputWhenFocusTarget(boolean verifyInputWhenFocusTarget)
{
if (this.verifyInputWhenFocusTarget == verifyInputWhenFocusTarget)
return;
this.verifyInputWhenFocusTarget = verifyInputWhenFocusTarget;
firePropertyChange("verifyInputWhenFocusTarget",
! verifyInputWhenFocusTarget,
verifyInputWhenFocusTarget);
}
/**
* Requests that this component gets the input focus if the
* requestFocusEnabled property is set to true.
* This also means that this component's top-level window becomes
* the focused window, if that is not already the case.
*
* The preconditions that have to be met to become a focus owner is that
* the component must be displayable, visible and focusable.
*
* Note that this signals only a request for becoming focused. There are
* situations in which it is not possible to get the focus. So developers
* should not assume that the component has the focus until it receives
* a {@link java.awt.event.FocusEvent} with a value of
* {@link java.awt.event.FocusEvent#FOCUS_GAINED}.
*
* @see Component#requestFocus()
*/
public void requestFocus()
{
if (isRequestFocusEnabled())
super.requestFocus();
}
/**
* This method is overridden to make it public so that it can be used
* by look and feel implementations.
*
* You should not use this method directly. Instead you are strongly
* encouraged to call {@link #requestFocus()} or
* {@link #requestFocusInWindow()} instead.
*
* @param temporary if the focus change is temporary
*
* @return false if the focus change request will definitly
* fail, true if it will likely succeed
*
* @see Component#requestFocus(boolean)
*
* @since 1.4
*/
public boolean requestFocus(boolean temporary)
{
return super.requestFocus(temporary);
}
/**
* Requests that this component gets the input focus if the top level
* window that contains this component has the focus and the
* requestFocusEnabled property is set to true.
*
* The preconditions that have to be met to become a focus owner is that
* the component must be displayable, visible and focusable.
*
* Note that this signals only a request for becoming focused. There are
* situations in which it is not possible to get the focus. So developers
* should not assume that the component has the focus until it receives
* a {@link java.awt.event.FocusEvent} with a value of
* {@link java.awt.event.FocusEvent#FOCUS_GAINED}.
*
* @return false if the focus change request will definitly
* fail, true if it will likely succeed
*
* @see Component#requestFocusInWindow()
*/
public boolean requestFocusInWindow()
{
if (isRequestFocusEnabled())
return super.requestFocusInWindow();
else
return false;
}
/**
* This method is overridden to make it public so that it can be used
* by look and feel implementations.
*
* You should not use this method directly. Instead you are strongly
* encouraged to call {@link #requestFocus()} or
* {@link #requestFocusInWindow()} instead.
*
* @param temporary if the focus change is temporary
*
* @return false if the focus change request will definitly
* fail, true if it will likely succeed
*
* @see Component#requestFocus(boolean)
*
* @since 1.4
*/
protected boolean requestFocusInWindow(boolean temporary)
{
return super.requestFocusInWindow(temporary);
}
/**
* Receives notification if this component is added to a parent component.
*
* Notification is sent to all registered AncestorListeners about the
* new parent.
*
* This method sets up ActionListeners for all registered KeyStrokes of
* this component in the chain of parent components.
*
* A PropertyChange event is fired to indicate that the ancestor property
* has changed.
*
* This method is used internally and should not be used in applications.
*/
public void addNotify()
{
// Register the WHEN_IN_FOCUSED_WINDOW keyboard bindings
// Note that here we unregister all bindings associated with
// this component and then re-register them. This may be more than
// necessary if the top-level ancestor hasn't changed. Should
// maybe improve this.
KeyboardManager km = KeyboardManager.getManager();
km.clearBindingsForComp(this);
km.registerEntireMap((ComponentInputMap)
this.getInputMap(WHEN_IN_FOCUSED_WINDOW));
super.addNotify();
// Notify AncestorListeners.
fireAncestorEvent(this, AncestorEvent.ANCESTOR_ADDED);
// fire property change event for 'ancestor'
firePropertyChange("ancestor", null, getParent());
}
/**
* Receives notification that this component no longer has a parent.
*
* This method sends an AncestorEvent to all registered AncestorListeners,
* notifying them that the parent is gone.
*
* The keybord actions of this component are removed from the parent and
* its ancestors.
*
* A PropertyChangeEvent is fired to indicate that the 'ancestor' property
* has changed.
*
* This method is called before the component is actually removed from
* its parent, so the parent is still visible through
* {@link Component#getParent}.
*/
public void removeNotify()
{
super.removeNotify();
KeyboardManager.getManager().clearBindingsForComp(this);
// Notify ancestor listeners.
fireAncestorEvent(this, AncestorEvent.ANCESTOR_REMOVED);
// fire property change event for 'ancestor'
firePropertyChange("ancestor", getParent(), null);
}
/**
* Returns true if the coordinates (x, y) lie within
* the bounds of this component and false otherwise.
* x and y are relative to the coordinate space of the component.
*
* @param x the X coordinate of the point to check
* @param y the Y coordinate of the point to check
*
* @return true if the specified point lies within the bounds
* of this component, false otherwise
*/
public boolean contains(int x, int y)
{
if (ui == null)
return super.contains(x, y);
else
return ui.contains(this, x, y);
}
/**
* Disables this component.
*
* @deprecated replaced by {@link #setEnabled(boolean)}
*/
public void disable()
{
super.disable();
}
/**
* Enables this component.
*
* @deprecated replaced by {@link #setEnabled(boolean)}
*/
public void enable()
{
super.enable();
}
/**
* Returns the Graphics context for this component. This can be used
* to draw on a component.
*
* @return the Graphics context for this component
*/
public Graphics getGraphics()
{
return super.getGraphics();
}
/**
* Returns the X coordinate of the upper left corner of this component.
* Prefer this method over {@link #getBounds} or {@link #getLocation}
* because it does not cause any heap allocation.
*
* @return the X coordinate of the upper left corner of the component
*/
public int getX()
{
return super.getX();
}
/**
* Returns the Y coordinate of the upper left corner of this component.
* Prefer this method over {@link #getBounds} or {@link #getLocation}
* because it does not cause any heap allocation.
*
* @return the Y coordinate of the upper left corner of the component
*/
public int getY()
{
return super.getY();
}
/**
* Returns the height of this component. Prefer this method over
* {@link #getBounds} or {@link #getSize} because it does not cause
* any heap allocation.
*
* @return the height of the component
*/
public int getHeight()
{
return super.getHeight();
}
/**
* Returns the width of this component. Prefer this method over
* {@link #getBounds} or {@link #getSize} because it does not cause
* any heap allocation.
*
* @return the width of the component
*/
public int getWidth()
{
return super.getWidth();
}
/**
* Prints this component to the given Graphics context. A call to this
* method results in calls to the methods {@link #printComponent},
* {@link #printBorder} and {@link #printChildren} in this order.
*
* Double buffering is temporarily turned off so the painting goes directly
* to the supplied Graphics context.
*
* @param g the Graphics context to print onto
*/
public void print(Graphics g)
{
boolean doubleBufferState = isDoubleBuffered();
setDoubleBuffered(false);
printComponent(g);
printBorder(g);
printChildren(g);
setDoubleBuffered(doubleBufferState);
}
/**
* Prints this component to the given Graphics context. This invokes
* {@link #print}.
*
* @param g the Graphics context to print onto
*/
public void printAll(Graphics g)
{
print(g);
}
/**
* Prints this component to the specified Graphics context. The default
* behaviour is to invoke {@link #paintComponent}. Override this
* if you want special behaviour for printing.
*
* @param g the Graphics context to print onto
*
* @since 1.3
*/
protected void printComponent(Graphics g)
{
paintComponent(g);
}
/**
* Print this component's children to the specified Graphics context.
* The default behaviour is to invoke {@link #paintChildren}. Override this
* if you want special behaviour for printing.
*
* @param g the Graphics context to print onto
*
* @since 1.3
*/
protected void printChildren(Graphics g)
{
paintChildren(g);
}
/**
* Print this component's border to the specified Graphics context.
* The default behaviour is to invoke {@link #paintBorder}. Override this
* if you want special behaviour for printing.
*
* @param g the Graphics context to print onto
*
* @since 1.3
*/
protected void printBorder(Graphics g)
{
paintBorder(g);
}
/**
* Processes mouse motion event, like dragging and moving.
*
* @param ev the MouseEvent describing the mouse motion
*/
protected void processMouseMotionEvent(MouseEvent ev)
{
super.processMouseMotionEvent(ev);
}
/**
* Moves and resizes the component.
*
* @param x the new horizontal location
* @param y the new vertial location
* @param w the new width
* @param h the new height
*/
public void reshape(int x, int y, int w, int h)
{
int oldX = getX();
int oldY = getY();
super.reshape(x, y, w, h);
// Notify AncestorListeners.
if (oldX != getX() || oldY != getY())
fireAncestorEvent(this, AncestorEvent.ANCESTOR_MOVED);
}
/**
* Fires an AncestorEvent to this component's and all of its child
* component's AncestorListeners.
*
* @param ancestor the component that triggered the event
* @param id the kind of ancestor event that should be fired
*/
void fireAncestorEvent(JComponent ancestor, int id)
{
// Fire event for registered ancestor listeners of this component.
AncestorListener[] listeners = getAncestorListeners();
if (listeners.length > 0)
{
AncestorEvent ev = new AncestorEvent(this, id,
ancestor, ancestor.getParent());
for (int i = 0; i < listeners.length; i++)
{
switch (id)
{
case AncestorEvent.ANCESTOR_MOVED:
listeners[i].ancestorMoved(ev);
break;
case AncestorEvent.ANCESTOR_ADDED:
listeners[i].ancestorAdded(ev);
break;
case AncestorEvent.ANCESTOR_REMOVED:
listeners[i].ancestorRemoved(ev);
break;
}
}
}
// Dispatch event to all children.
int numChildren = getComponentCount();
for (int i = 0; i < numChildren; i++)
{
Component child = getComponent(i);
if (! (child instanceof JComponent))
continue;
JComponent jc = (JComponent) child;
jc.fireAncestorEvent(ancestor, id);
}
}
/**
* This is the method that gets called when the WHEN_IN_FOCUSED_WINDOW map
* is changed.
*
* @param changed the JComponent associated with the WHEN_IN_FOCUSED_WINDOW
* map
*/
void updateComponentInputMap(ComponentInputMap changed)
{
// Since you can change a component's input map via
// setInputMap, we have to check if changed
// is still in our WHEN_IN_FOCUSED_WINDOW map hierarchy
InputMap curr = getInputMap(WHEN_IN_FOCUSED_WINDOW);
while (curr != null && curr != changed)
curr = curr.getParent();
// If curr is null then changed is not in the hierarchy
if (curr == null)
return;
// Now we have to update the keyboard manager's hashtable
KeyboardManager km = KeyboardManager.getManager();
// This is a poor strategy, should be improved. We currently
// delete all the old bindings for the component and then register
// the current bindings.
km.clearBindingsForComp(changed.getComponent());
km.registerEntireMap((ComponentInputMap)
getInputMap(WHEN_IN_FOCUSED_WINDOW));
}
/**
* Helper method for
* {@link LookAndFeel#installProperty(JComponent, String, Object)}.
*
* @param propertyName the name of the property
* @param value the value of the property
*
* @throws IllegalArgumentException if the specified property cannot be set
* by this method
* @throws ClassCastException if the property value does not match the
* property type
* @throws NullPointerException if c or
* propertyValue is null
*/
void setUIProperty(String propertyName, Object value)
{
if (propertyName.equals("opaque"))
{
if (! clientOpaqueSet)
{
setOpaque(((Boolean) value).booleanValue());
clientOpaqueSet = false;
}
}
else if (propertyName.equals("autoscrolls"))
{
if (! clientAutoscrollsSet)
{
setAutoscrolls(((Boolean) value).booleanValue());
clientAutoscrollsSet = false;
}
}
else
{
throw new IllegalArgumentException
("Unsupported property for LookAndFeel.installProperty(): "
+ propertyName);
}
}
}