basiccomboboxui.java

java jdk 1.4的源码

     * @see #addEditor
     */
    public void removeEditor() {
        if ( editor != null ) {
            unconfigureEditor();
            comboBox.remove( editor );
	    editor = null;
        }
    }

    /**
     * This protected method is implementation specific and should be private.
     * do not call or override.
     * 
     * @see #addEditor
     */
    protected void configureEditor() {
        // Should be in the same state as the combobox
        editor.setEnabled(comboBox.isEnabled());

        editor.setFont( comboBox.getFont() );

        if ( editor instanceof Accessible ) {
            AccessibleContext ac = ((Accessible) editor).getAccessibleContext();
            if ( ac != null ) {
                ac.setAccessibleParent(comboBox);
            }
        }

        if (focusListener != null) {
            editor.addFocusListener(focusListener);
        }

        if (editorFocusListener == null)  {
            editorFocusListener = new EditorFocusListener();
        }
	editor.addFocusListener( editorFocusListener );

	if (editorActionListener == null) {
	    editorActionListener = new EditorActionListener();
	}
	comboBox.getEditor().addActionListener(editorActionListener);

        comboBox.configureEditor(comboBox.getEditor(),comboBox.getSelectedItem());
    }

    /**
     * This protected method is implementation specific and should be private.
     * Do not call or override.
     * 
     * @see #addEditor
     */
    protected void unconfigureEditor() {
        if (focusListener != null) {
            editor.removeFocusListener(focusListener);
        }

        if ( editorFocusListener != null )  {
            editor.removeFocusListener( editorFocusListener );
        }

	if ( editorActionListener != null) {
	    comboBox.getEditor().removeActionListener(editorActionListener);
	}
    }

    /**
     * This public method is implementation specific and should be private. Do
     * not call or override.
     *
     * @see #createArrowButton
     */
    public void configureArrowButton() {
        if ( arrowButton != null ) {
            arrowButton.setEnabled( comboBox.isEnabled() );
            arrowButton.setRequestFocusEnabled(false);
	    arrowButton.addMouseListener( popup.getMouseListener() );
	    arrowButton.addMouseMotionListener( popup.getMouseMotionListener() );
            arrowButton.resetKeyboardActions();
        }
    }

    /**
     * This public method is implementation specific and should be private. Do
     * not call or override.
     *
     * @see #createArrowButton
     */
    public void unconfigureArrowButton() {
        if ( arrowButton != null ) {
	    arrowButton.removeMouseListener( popup.getMouseListener() );
	    arrowButton.removeMouseMotionListener( popup.getMouseMotionListener() );
        }
    }

    /**
     * Creates an button which will be used as the control to show or hide
     * the popup portion of the combo box.
     *
     * @return a button which represents the popup control
     */
    protected JButton createArrowButton() {
        return new BasicArrowButton(BasicArrowButton.SOUTH,
				    UIManager.getColor("ComboBox.buttonBackground"),
				    UIManager.getColor("ComboBox.buttonShadow"),
				    UIManager.getColor("ComboBox.buttonDarkShadow"),
				    UIManager.getColor("ComboBox.buttonHighlight"));
    }

    //
    // end Sub-Component Management
    //===============================


    //================================
    // begin ComboBoxUI Implementation
    //

    /**
     * Tells if the popup is visible or not.
     */
    public boolean isPopupVisible( JComboBox c ) {
        return popup.isVisible();
    }

    /**
     * Hides the popup.
     */
    public void setPopupVisible( JComboBox c, boolean v ) {
        if ( v ) {
            popup.show();
        } else {
            popup.hide();
        }
    }

    /**
     * Determines if the JComboBox is focus traversable.  If the JComboBox is editable
     * this returns false, otherwise it returns true.
     */
    public boolean isFocusTraversable( JComboBox c ) {
        return !comboBox.isEditable();
    }

    //
    // end ComboBoxUI Implementation
    //==============================


    //=================================
    // begin ComponentUI Implementation

    public void paint( Graphics g, JComponent c ) {
        hasFocus = comboBox.hasFocus();
        if ( !comboBox.isEditable() ) {
            Rectangle r = rectangleForCurrentValue();
            paintCurrentValueBackground(g,r,hasFocus);
            paintCurrentValue(g,r,hasFocus);
        }
    }

    public Dimension getPreferredSize( JComponent c ) {
	return getMinimumSize(c);
    }

    /** 
     * The minumum size is the size of the display area plus insets plus the button.
     */
    public Dimension getMinimumSize( JComponent c ) {
        if ( !isMinimumSizeDirty ) {
            return new Dimension(cachedMinimumSize);
        }
        Dimension size = getDisplaySize();
        Insets insets = getInsets();
        size.height += insets.top + insets.bottom;
        int buttonSize = size.height - (insets.top + insets.bottom);
        size.width +=  insets.left + insets.right + buttonSize;

        cachedMinimumSize.setSize( size.width, size.height ); 
        isMinimumSizeDirty = false;

        return new Dimension(size);
    }

    public Dimension getMaximumSize( JComponent c ) {
	return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
    }

    // This is currently hacky...
    public int getAccessibleChildrenCount(JComponent c) {
        if ( comboBox.isEditable() ) {
            return 2;
        }
        else {
            return 1;
        }
    }

    // This is currently hacky...
    public Accessible getAccessibleChild(JComponent c, int i) {
        // 0 = the popup
        // 1 = the editor
        switch ( i ) {
        case 0:
            if ( popup instanceof Accessible ) {
                AccessibleContext ac = ((Accessible) popup).getAccessibleContext();
                ac.setAccessibleParent(comboBox);
                return(Accessible) popup;
            }
            break;
        case 1:
            if ( comboBox.isEditable() 
                 && (editor instanceof Accessible) ) {
                AccessibleContext ac = ((Accessible) editor).getAccessibleContext();
                ac.setAccessibleParent(comboBox);
                return(Accessible) editor;
            }
            break;
        }
        return null;
    }

    //
    // end ComponentUI Implementation
    //===============================


    //======================
    // begin Utility Methods
    //

    /**
     * Returns whether or not the supplied keyCode maps to a key that is used for
     * navigation.  This is used for optimizing key input by only passing non-
     * navigation keys to the type-ahead mechanism.  Subclasses should override this
     * if they change the navigation keys.
     */
    protected boolean isNavigationKey( int keyCode ) {
        return keyCode == KeyEvent.VK_UP || keyCode == KeyEvent.VK_DOWN ||
        // This is horrible, but necessary since these aren't 
        // supported until JDK 1.2
        keyCode == KeyStroke.getKeyStroke("KP_UP").getKeyCode() || 
        keyCode == KeyStroke.getKeyStroke("KP_DOWN").getKeyCode();
    }  

    /**
     * Selects the next item in the list.  It won't change the selection if the
     * currently selected item is already the last item.
     */
    protected void selectNextPossibleValue() {
        int si;

        if ( isTableCellEditor ) {
            si = listBox.getSelectedIndex();
        }
        else {
            si = comboBox.getSelectedIndex();
        }

        if ( si < comboBox.getModel().getSize() - 1 ) {
            if ( isTableCellEditor ) {
                listBox.setSelectedIndex( si + 1 );
                listBox.ensureIndexIsVisible( si + 1 );
            }
            else {
                comboBox.setSelectedIndex(si+1);
            }
            comboBox.repaint();
        }
    }

    /**
     * Selects the previous item in the list.  It won't change the selection if the
     * currently selected item is already the first item.
     */
    protected void selectPreviousPossibleValue() {
        int si;

        if ( isTableCellEditor ) {
            si = listBox.getSelectedIndex();
        }
        else {
            si = comboBox.getSelectedIndex();
        }

        if ( si > 0 ) {
            if ( isTableCellEditor ) {
                listBox.setSelectedIndex( si - 1 );
                listBox.ensureIndexIsVisible( si - 1 );
            }
            else {
                comboBox.setSelectedIndex(si-1);
            }

            comboBox.repaint();
        }
    }

    /**
     * Hides the popup if it is showing and shows the popup if it is hidden.
     */
    protected void toggleOpenClose() {
        setPopupVisible(comboBox, !isPopupVisible(comboBox));
    }

    /**
     * Returns the area that is reserved for drawing the currently selected item.
     */
    protected Rectangle rectangleForCurrentValue() {
        int width = comboBox.getWidth();
        int height = comboBox.getHeight();
        Insets insets = getInsets();
        int buttonSize = height - (insets.top + insets.bottom);
	if ( arrowButton != null ) {
            buttonSize = arrowButton.getWidth();
	}
	if(BasicGraphicsUtils.isLeftToRight(comboBox)) {
	    return new Rectangle(insets.left, insets.top,
			     width - (insets.left + insets.right + buttonSize),
                             height - (insets.top + insets.bottom));
	}
	else {
	    return new Rectangle(insets.left + buttonSize, insets.top,
			     width - (insets.left + insets.right + buttonSize),
                             height - (insets.top + insets.bottom));
	}
    }

    /**
     * Gets the insets from the JComboBox.
     */
    protected Insets getInsets() {
        return comboBox.getInsets();
    }

    //
    // end Utility Methods
    //====================


    //===============================
    // begin Painting Utility Methods
    //

    /**
     * Paints the currently selected item.
     */
    public void paintCurrentValue(Graphics g,Rectangle bounds,boolean hasFocus) {
        ListCellRenderer renderer = comboBox.getRenderer();
        Component c;

        if ( hasFocus && !isPopupVisible(comboBox) ) {
            c = renderer.getListCellRendererComponent( listBox,
                                                       comboBox.getSelectedItem(),
                                                       -1,
                                                       true,
                                                       false );
        }
        else {
            c = renderer.getListCellRendererComponent( listBox,
                                                       comboBox.getSelectedItem(),
                                                       -1,
                                                       false,
                                                       false );
            c.setBackground(UIManager.getColor("ComboBox.background"));
        }
        c.setFont(comboBox.getFont());
        if ( hasFocus && !isPopupVisible(comboBox) ) {
            c.setForeground(listBox.getSelectionForeground());
            c.setBackground(listBox.getSelectionBackground());
        }
        else {
            if ( comboBox.isEnabled() ) {
                c.setForeground(comboBox.getForeground());
                c.setBackground(comboBox.getBackground());
            }
            else {
                c.setForeground(UIManager.getColor("ComboBox.disabledForeground"));
                c.setBackground(UIManager.getColor("ComboBox.disabledBackground"));
            }
        }

        // Fix for 4238829: should lay out the JPanel.
        boolean shouldValidate = false;
        if (c instanceof JPanel)  {
            shouldValidate = true;
        }

        currentValuePane.paintComponent(g,c,comboBox,bounds.x,bounds.y,
                                        bounds.width,bounds.height, shouldValidate);
    }

    /**
     * Paints the background of the currently selected item.
     */
    public void paintCurrentValueBackground(Graphics g,Rectangle bounds,boolean hasFocus) {
        Color t = g.getColor();
        if ( comboBox.isEnabled() )