Class StyledTreeCellRenderer

  • All Implemented Interfaces:
    java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, javax.accessibility.Accessible, javax.swing.SwingConstants, javax.swing.tree.TreeCellRenderer

    public class StyledTreeCellRenderer
    extends StyledLabel
    implements javax.swing.tree.TreeCellRenderer
    A tree cell renderer based on StyledLabel. To use it, you should make your cell renderer extending this one and override customizeStyledLabel(javax.swing.JTree, Object, boolean, boolean, boolean, int, boolean) method. If your overridden method, you can call setStyleRange() or setStyleRanges() based on the tree node value and row index.
    See Also:
    Serialized Form
    • Nested Class Summary

      • Nested classes/interfaces inherited from class javax.swing.JLabel

        javax.swing.JLabel.AccessibleJLabel
      • Nested classes/interfaces inherited from class javax.swing.JComponent

        javax.swing.JComponent.AccessibleJComponent
      • Nested classes/interfaces inherited from class java.awt.Container

        java.awt.Container.AccessibleAWTContainer
      • Nested classes/interfaces inherited from class java.awt.Component

        java.awt.Component.AccessibleAWTComponent, java.awt.Component.BaselineResizeBehavior, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy
    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected java.awt.Color backgroundNonSelectionColor
      Color to use for the background when the node isn't selected.
      protected java.awt.Color backgroundSelectionColor
      Color to use for the background when a node is selected.
      protected java.awt.Color borderSelectionColor
      Color to use for the focus indicator when the node has focus.
      protected javax.swing.Icon closedIcon
      Icon used to show non-leaf nodes that aren't expanded.
      protected boolean hasFocus
      True if has focus.
      protected javax.swing.Icon leafIcon
      Icon used to show leaf nodes.
      protected javax.swing.Icon openIcon
      Icon used to show non-leaf nodes that are expanded.
      protected boolean selected
      Is the value currently selected.
      protected java.awt.Color textNonSelectionColor
      Color to use for the foreground for non-selected nodes.
      protected java.awt.Color textSelectionColor
      Color to use for the foreground for selected nodes.
      • Fields inherited from class javax.swing.JLabel

        labelFor
      • Fields inherited from class javax.swing.JComponent

        listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW
      • Fields inherited from class java.awt.Component

        accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
      • Fields inherited from interface java.awt.image.ImageObserver

        ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
      • Fields inherited from interface javax.swing.SwingConstants

        BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
    • Constructor Summary

      Constructors 
      Constructor Description
      StyledTreeCellRenderer()
      Returns a new instance of DefaultTreeCellRenderer.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected void customizeStyledLabel​(javax.swing.JTree tree, java.lang.Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)
      Overrides this method to customize the styled label.
      void firePropertyChange​(java.lang.String propertyName, boolean oldValue, boolean newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, byte oldValue, byte newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, char oldValue, char newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, double oldValue, double newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, float oldValue, float newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, int oldValue, int newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, long oldValue, long newValue)
      Overridden for performance reasons.
      void firePropertyChange​(java.lang.String propertyName, short oldValue, short newValue)
      Overridden for performance reasons.
      protected void firePropertyChange​(java.lang.String propertyName, java.lang.Object oldValue, java.lang.Object newValue)
      Overridden for performance reasons.
      java.awt.Color getBackgroundNonSelectionColor()
      Returns the background color to be used for non selected nodes.
      java.awt.Color getBackgroundSelectionColor()
      Returns the color to use for the background if node is selected.
      java.awt.Color getBorderSelectionColor()
      Returns the color the border is drawn.
      javax.swing.Icon getClosedIcon()
      Returns the icon used to represent non-leaf nodes that are not expanded.
      javax.swing.Icon getDefaultClosedIcon()
      Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are not expanded.
      javax.swing.Icon getDefaultLeafIcon()
      Returns the default icon, for the current laf, that is used to represent leaf nodes.
      javax.swing.Icon getDefaultOpenIcon()
      Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are expanded.
      java.awt.Font getFont()
      Gets the font of this component.
      javax.swing.Icon getLeafIcon()
      Returns the icon used to represent leaf nodes.
      javax.swing.Icon getOpenIcon()
      Returns the icon used to represent non-leaf nodes that are expanded.
      java.awt.Dimension getPreferredSize()
      Overrides JComponent.getPreferredSize to return slightly wider preferred size value.
      java.awt.Color getTextNonSelectionColor()
      Returns the color the text is drawn with when the node isn't selected.
      java.awt.Color getTextSelectionColor()
      Returns the color the text is drawn with when the node is selected.
      java.awt.Component getTreeCellRendererComponent​(javax.swing.JTree tree, java.lang.Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)
      Configures the renderer based on the passed in components.
      void invalidate()
      Overridden for performance reasons.
      void paint​(java.awt.Graphics g)
      Paints the value.
      void repaint()
      Overridden for performance reasons.
      void repaint​(long tm, int x, int y, int width, int height)
      Overridden for performance reasons.
      void repaint​(java.awt.Rectangle r)
      Overridden for performance reasons.
      void revalidate()
      Overridden for performance reasons.
      void setBackground​(java.awt.Color color)
      Subclassed to map ColorUIResources to null.
      void setBackgroundNonSelectionColor​(java.awt.Color newColor)
      Sets the background color to be used for non selected nodes.
      void setBackgroundSelectionColor​(java.awt.Color newColor)
      Sets the color to use for the background if node is selected.
      void setBorderSelectionColor​(java.awt.Color newColor)
      Sets the color to use for the border.
      void setClosedIcon​(javax.swing.Icon newIcon)
      Sets the icon used to represent non-leaf nodes that are not expanded.
      void setFont​(java.awt.Font font)
      Subclassed to map FontUIResources to null.
      void setLeafIcon​(javax.swing.Icon newIcon)
      Sets the icon used to represent leaf nodes.
      void setOpenIcon​(javax.swing.Icon newIcon)
      Sets the icon used to represent non-leaf nodes that are expanded.
      void setTextNonSelectionColor​(java.awt.Color newColor)
      Sets the color the text is drawn with when the node isn't selected.
      void setTextSelectionColor​(java.awt.Color newColor)
      Sets the color the text is drawn with when the node is selected.
      void updateUI()
      Resets the UI property to a value from the current look and feel.
      void validate()
      Overridden for performance reasons.
      • Methods inherited from class javax.swing.JLabel

        checkHorizontalKey, checkVerticalKey, getAccessibleContext, getDisabledIcon, getDisplayedMnemonic, getDisplayedMnemonicIndex, getHorizontalAlignment, getHorizontalTextPosition, getIcon, getIconTextGap, getLabelFor, getText, getUI, getVerticalAlignment, getVerticalTextPosition, imageUpdate, paramString, setDisabledIcon, setDisplayedMnemonic, setDisplayedMnemonic, setDisplayedMnemonicIndex, setHorizontalAlignment, setHorizontalTextPosition, setIcon, setIconTextGap, setLabelFor, setText, setUI, setVerticalAlignment, setVerticalTextPosition
      • Methods inherited from class javax.swing.JComponent

        addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update
      • Methods inherited from class java.awt.Container

        add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validateTree
      • Methods inherited from class java.awt.Component

        action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
    • Field Detail

      • selected

        protected boolean selected
        Is the value currently selected.
      • hasFocus

        protected boolean hasFocus
        True if has focus.
      • closedIcon

        protected transient javax.swing.Icon closedIcon
        Icon used to show non-leaf nodes that aren't expanded.
      • leafIcon

        protected transient javax.swing.Icon leafIcon
        Icon used to show leaf nodes.
      • openIcon

        protected transient javax.swing.Icon openIcon
        Icon used to show non-leaf nodes that are expanded.
      • textSelectionColor

        protected java.awt.Color textSelectionColor
        Color to use for the foreground for selected nodes.
      • textNonSelectionColor

        protected java.awt.Color textNonSelectionColor
        Color to use for the foreground for non-selected nodes.
      • backgroundSelectionColor

        protected java.awt.Color backgroundSelectionColor
        Color to use for the background when a node is selected.
      • backgroundNonSelectionColor

        protected java.awt.Color backgroundNonSelectionColor
        Color to use for the background when the node isn't selected.
      • borderSelectionColor

        protected java.awt.Color borderSelectionColor
        Color to use for the focus indicator when the node has focus.
    • Constructor Detail

      • StyledTreeCellRenderer

        public StyledTreeCellRenderer()
        Returns a new instance of DefaultTreeCellRenderer. Alignment is set to left aligned. Icons and text color are determined from the UIManager.
    • Method Detail

      • updateUI

        public void updateUI()
        Description copied from class: StyledLabel
        Resets the UI property to a value from the current look and feel.
        Overrides:
        updateUI in class StyledLabel
        See Also:
        JComponent.updateUI()
      • getDefaultOpenIcon

        public javax.swing.Icon getDefaultOpenIcon()
        Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are expanded.
      • getDefaultClosedIcon

        public javax.swing.Icon getDefaultClosedIcon()
        Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are not expanded.
      • getDefaultLeafIcon

        public javax.swing.Icon getDefaultLeafIcon()
        Returns the default icon, for the current laf, that is used to represent leaf nodes.
      • setOpenIcon

        public void setOpenIcon​(javax.swing.Icon newIcon)
        Sets the icon used to represent non-leaf nodes that are expanded.
      • getOpenIcon

        public javax.swing.Icon getOpenIcon()
        Returns the icon used to represent non-leaf nodes that are expanded.
      • setClosedIcon

        public void setClosedIcon​(javax.swing.Icon newIcon)
        Sets the icon used to represent non-leaf nodes that are not expanded.
      • getClosedIcon

        public javax.swing.Icon getClosedIcon()
        Returns the icon used to represent non-leaf nodes that are not expanded.
      • setLeafIcon

        public void setLeafIcon​(javax.swing.Icon newIcon)
        Sets the icon used to represent leaf nodes.
      • getLeafIcon

        public javax.swing.Icon getLeafIcon()
        Returns the icon used to represent leaf nodes.
      • setTextSelectionColor

        public void setTextSelectionColor​(java.awt.Color newColor)
        Sets the color the text is drawn with when the node is selected.
      • getTextSelectionColor

        public java.awt.Color getTextSelectionColor()
        Returns the color the text is drawn with when the node is selected.
      • setTextNonSelectionColor

        public void setTextNonSelectionColor​(java.awt.Color newColor)
        Sets the color the text is drawn with when the node isn't selected.
      • getTextNonSelectionColor

        public java.awt.Color getTextNonSelectionColor()
        Returns the color the text is drawn with when the node isn't selected.
      • setBackgroundSelectionColor

        public void setBackgroundSelectionColor​(java.awt.Color newColor)
        Sets the color to use for the background if node is selected.
      • getBackgroundSelectionColor

        public java.awt.Color getBackgroundSelectionColor()
        Returns the color to use for the background if node is selected.
      • setBackgroundNonSelectionColor

        public void setBackgroundNonSelectionColor​(java.awt.Color newColor)
        Sets the background color to be used for non selected nodes.
      • getBackgroundNonSelectionColor

        public java.awt.Color getBackgroundNonSelectionColor()
        Returns the background color to be used for non selected nodes.
      • setBorderSelectionColor

        public void setBorderSelectionColor​(java.awt.Color newColor)
        Sets the color to use for the border.
      • getBorderSelectionColor

        public java.awt.Color getBorderSelectionColor()
        Returns the color the border is drawn.
      • setFont

        public void setFont​(java.awt.Font font)
        Subclassed to map FontUIResources to null. If font is null, or a FontUIResource, this has the effect of letting the font of the JTree show through. On the other hand, if font is non-null, and not a FontUIResource, the font becomes font.
        Overrides:
        setFont in class javax.swing.JComponent
      • getFont

        public java.awt.Font getFont()
        Gets the font of this component.
        Specified by:
        getFont in interface java.awt.MenuContainer
        Overrides:
        getFont in class java.awt.Component
        Returns:
        this component's font; if a font has not been set for this component, the font of its parent is returned
      • setBackground

        public void setBackground​(java.awt.Color color)
        Subclassed to map ColorUIResources to null. If color is null, or a ColorUIResource, this has the effect of letting the background color of the JTree show through. On the other hand, if color is non-null, and not a ColorUIResource, the background becomes color.
        Overrides:
        setBackground in class javax.swing.JComponent
      • getTreeCellRendererComponent

        public java.awt.Component getTreeCellRendererComponent​(javax.swing.JTree tree,
                                                               java.lang.Object value,
                                                               boolean sel,
                                                               boolean expanded,
                                                               boolean leaf,
                                                               int row,
                                                               boolean hasFocus)
        Configures the renderer based on the passed in components. The value is set from messaging the tree with convertValueToText, which ultimately invokes toString on value. The foreground color is set based on the selection and the icon is set based on the leaf and expanded parameters.
        Specified by:
        getTreeCellRendererComponent in interface javax.swing.tree.TreeCellRenderer
      • customizeStyledLabel

        protected void customizeStyledLabel​(javax.swing.JTree tree,
                                            java.lang.Object value,
                                            boolean sel,
                                            boolean expanded,
                                            boolean leaf,
                                            int row,
                                            boolean hasFocus)
        Overrides this method to customize the styled label.
        Parameters:
        tree -
        value -
        sel -
        expanded -
        leaf -
        row -
        hasFocus -
      • paint

        public void paint​(java.awt.Graphics g)
        Paints the value. The background is filled based on selected.
        Overrides:
        paint in class javax.swing.JComponent
      • getPreferredSize

        public java.awt.Dimension getPreferredSize()
        Overrides JComponent.getPreferredSize to return slightly wider preferred size value.
        Overrides:
        getPreferredSize in class javax.swing.JComponent
      • validate

        public void validate()
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        validate in class java.awt.Container
      • invalidate

        public void invalidate()
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        invalidate in class java.awt.Container
        Since:
        1.5
      • revalidate

        public void revalidate()
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        revalidate in class javax.swing.JComponent
      • repaint

        public void repaint​(long tm,
                            int x,
                            int y,
                            int width,
                            int height)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        repaint in class javax.swing.JComponent
      • repaint

        public void repaint​(java.awt.Rectangle r)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        repaint in class javax.swing.JComponent
      • repaint

        public void repaint()
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        repaint in class java.awt.Component
        Since:
        1.5
      • firePropertyChange

        protected void firePropertyChange​(java.lang.String propertyName,
                                          java.lang.Object oldValue,
                                          java.lang.Object newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       byte oldValue,
                                       byte newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       char oldValue,
                                       char newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class javax.swing.JComponent
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       short oldValue,
                                       short newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       int oldValue,
                                       int newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class javax.swing.JComponent
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       long oldValue,
                                       long newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       float oldValue,
                                       float newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       double oldValue,
                                       double newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class java.awt.Component
      • firePropertyChange

        public void firePropertyChange​(java.lang.String propertyName,
                                       boolean oldValue,
                                       boolean newValue)
        Overridden for performance reasons. See the Implementation Note for more information.
        Overrides:
        firePropertyChange in class javax.swing.JComponent