basiccomboboxui.java

JAVA 所有包

    protected void unconfigureEditor() {
        if (focusListener != null) {
            editor.removeFocusListener(focusListener);
        }

        editor.removeFocusListener(getHandler());
        comboBox.getEditor().removeActionListener(getHandler());
    }

    /**
     * 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.setFocusable(comboBox.isFocusable());
            arrowButton.setRequestFocusEnabled(false);
	    arrowButton.addMouseListener( popup.getMouseListener() );
	    arrowButton.addMouseMotionListener( popup.getMouseMotionListener() );
            arrowButton.resetKeyboardActions();
            arrowButton.putClientProperty("doNotCancelPopup", HIDE_POPUP_KEY);
            arrowButton.setInheritsPopupMenu(true);
        }
    }

    /**
     * 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() {
        JButton button = new BasicArrowButton(BasicArrowButton.SOUTH,
				    UIManager.getColor("ComboBox.buttonBackground"),
				    UIManager.getColor("ComboBox.buttonShadow"),
				    UIManager.getColor("ComboBox.buttonDarkShadow"),
				    UIManager.getColor("ComboBox.buttonHighlight"));
        button.setName("ComboBox.arrowButton");
        return button;
    }

    //
    // 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);
    }

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        super.getBaseline(c, width, height);
        int baseline = -1;
        // force sameBaseline to be updated.
        getDisplaySize();
        if (sameBaseline) {
            Insets insets = c.getInsets();
            height = height - insets.top - insets.bottom;
            if (!comboBox.isEditable()) {
                ListCellRenderer renderer = comboBox.getRenderer();
                if (renderer == null)  {
                    renderer = new DefaultListCellRenderer();
                }
                Object value = null;
                Object prototypeValue = comboBox.getPrototypeDisplayValue();
                if (prototypeValue != null)  {
                    value = prototypeValue;
                }
                else if (comboBox.getModel().getSize() > 0) {
                    // Note, we're assuming the baseline is the same for all
                    // cells, if not, this needs to loop through all.
                    value = comboBox.getModel().getElementAt(0);
                }
                if (value == null) {
                    value = " ";
                } else if (value instanceof String && "".equals(value)) {
                    value = " ";
                }
                Component component = renderer.
                        getListCellRendererComponent(listBox, value, -1,
                                                     false, false);
                if (component instanceof JComponent) {
                    component.setFont(comboBox.getFont());
                }
                baseline = component.getBaseline(width, height);
            }
            else {
                baseline = editor.getBaseline(width, height);
            }
            if (baseline > 0) {
                baseline += insets.top;
            }
        }
        return baseline;
    }
	
    /**
     * Returns an enum indicating how the baseline of the component
     * changes as the size changes.
     *
     * @throws NullPointerException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(
            JComponent c) {
        super.getBaselineResizeBehavior(c);
        // Force sameBaseline to be updated.
        getDisplaySize();
        if (comboBox.isEditable()) {
            return editor.getBaselineResizeBehavior();
        }
        else if (sameBaseline) {
            ListCellRenderer renderer = comboBox.getRenderer();
            if (renderer == null)  {
                renderer = new DefaultListCellRenderer();
            }
            Object value = null;
            Object prototypeValue = comboBox.getPrototypeDisplayValue();
            if (prototypeValue != null)  {
                value = prototypeValue;
            }
            else if (comboBox.getModel().getSize() > 0) {
                // Note, we're assuming the baseline is the same for all
                // cells, if not, this needs to loop through all.
                value = comboBox.getModel().getElementAt(0);
            }
            if (value != null) {
                Component component = renderer.
                        getListCellRendererComponent(listBox, value, -1,
                                                     false, false);
                return component.getBaselineResizeBehavior();
            }
        }
        return Component.BaselineResizeBehavior.OTHER;
    }

    // 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 ||
               keyCode == KeyEvent.VK_KP_UP || keyCode == KeyEvent.VK_KP_DOWN;
    }  

    private boolean isNavigationKey(int keyCode, int modifiers) {
 	InputMap inputMap = comboBox.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
 	KeyStroke key = KeyStroke.getKeyStroke(keyCode, modifiers);
	
 	if (inputMap != null && inputMap.get(key) != null) {
 	    return true;
 	}
 	return false;
    }

    /**
     * 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));
	}
    }