basictabbedpaneui.java

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  {
    LookAndFeel.installColorsAndFont(tabPane, "TabbedPane.background",
                                     "TabbedPane.foreground",
                                     "TabbedPane.font");
    tabPane.setOpaque(false);

    highlight = UIManager.getColor("TabbedPane.highlight");
    lightHighlight = UIManager.getColor("TabbedPane.lightHighlight");

    shadow = UIManager.getColor("TabbedPane.shadow");
    darkShadow = UIManager.getColor("TabbedPane.darkShadow");

    focus = UIManager.getColor("TabbedPane.focus");

    textIconGap = UIManager.getInt("TabbedPane.textIconGap");
    tabRunOverlay = UIManager.getInt("TabbedPane.tabRunOverlay");

    tabInsets = UIManager.getInsets("TabbedPane.tabInsets");
    selectedTabPadInsets = UIManager.getInsets("TabbedPane.tabbedPaneTabPadInsets");
    tabAreaInsets = UIManager.getInsets("TabbedPane.tabAreaInsets");
    contentBorderInsets = UIManager.getInsets("TabbedPane.tabbedPaneContentBorderInsets");
    tabsOpaque = UIManager.getBoolean("TabbedPane.tabsOpaque");

    calcRect = new Rectangle();
    tabRuns = new int[10];
    tabAreaRect = new Rectangle();
    contentRect = new Rectangle();
  }

  /**
   * This method uninstalls defaults for the Look and Feel.
   */
  protected void uninstallDefaults()
  {
    calcRect = null;
    tabAreaRect = null;
    contentRect = null;
    tabRuns = null;

    contentBorderInsets = null;
    tabAreaInsets = null;
    selectedTabPadInsets = null;
    tabInsets = null;

    focus = null;
    darkShadow = null;
    shadow = null;
    lightHighlight = null;
    highlight = null;

    tabPane.setBackground(null);
    tabPane.setForeground(null);
    tabPane.setFont(null);
  }

  /**
   * This method creates and installs the listeners for this UI.
   */
  protected void installListeners()
  {
    mouseListener = createMouseListener();
    tabChangeListener = createChangeListener();
    propertyChangeListener = createPropertyChangeListener();
    focusListener = createFocusListener();

    tabPane.addMouseListener(mouseListener);
    tabPane.addChangeListener(tabChangeListener);
    tabPane.addPropertyChangeListener(propertyChangeListener);
    tabPane.addFocusListener(focusListener);
  }

  /**
   * This method removes and nulls the listeners for this UI.
   */
  protected void uninstallListeners()
  {
    tabPane.removeFocusListener(focusListener);
    tabPane.removePropertyChangeListener(propertyChangeListener);
    tabPane.removeChangeListener(tabChangeListener);
    tabPane.removeMouseListener(mouseListener);

    focusListener = null;
    propertyChangeListener = null;
    tabChangeListener = null;
    mouseListener = null;
  }

  /**
   * This method creates a new MouseListener.
   *
   * @return A new MouseListener.
   */
  protected MouseListener createMouseListener()
  {
    return new MouseHandler();
  }

  /**
   * This method creates a new FocusListener.
   *
   * @return A new FocusListener.
   */
  protected FocusListener createFocusListener()
  {
    return new FocusHandler();
  }

  /**
   * This method creates a new ChangeListener.
   *
   * @return A new ChangeListener.
   */
  protected ChangeListener createChangeListener()
  {
    return new TabSelectionHandler();
  }

  /**
   * This method creates a new PropertyChangeListener.
   *
   * @return A new PropertyChangeListener.
   */
  protected PropertyChangeListener createPropertyChangeListener()
  {
    return new PropertyChangeHandler();
  }

  /**
   * This method installs keyboard actions for the JTabbedPane.
   */
  protected void installKeyboardActions()
  {
    // FIXME: Implement.
  }

  /**
   * This method uninstalls keyboard actions for the JTabbedPane.
   */
  protected void uninstallKeyboardActions()
  {
    // FIXME: Implement.
  }

  /**
   * This method returns the minimum size of the JTabbedPane.
   *
   * @param c The JComponent to find a size for.
   *
   * @return The minimum size.
   */
  public Dimension getMinimumSize(JComponent c)
  {
    return layoutManager.minimumLayoutSize(tabPane);
  }

  /**
   * This method returns the maximum size of the JTabbedPane.
   *
   * @param c The JComponent to find a size for.
   *
   * @return The maximum size.
   */
  public Dimension getMaximumSize(JComponent c)
  {
    return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
  }

  /**
   * This method paints the JTabbedPane.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  public void paint(Graphics g, JComponent c)
  {
    if (!tabPane.isValid())
      tabPane.validate();

    if (tabPane.getTabCount() == 0)
      return;
    if (tabPane.getTabLayoutPolicy() == JTabbedPane.WRAP_TAB_LAYOUT)
      paintTabArea(g, tabPane.getTabPlacement(), tabPane.getSelectedIndex());
    paintContentBorder(g, tabPane.getTabPlacement(), tabPane.getSelectedIndex());
  }

  /**
   * This method paints the tab area. This includes painting the rectangles
   * that make up the tabs.
   *
   * @param g The Graphics object to paint with.
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param selectedIndex The selected index.
   */
  protected void paintTabArea(Graphics g, int tabPlacement, int selectedIndex)
  {
    Rectangle ir = new Rectangle();
    Rectangle tr = new Rectangle();

    boolean isScroll = tabPane.getTabLayoutPolicy() == JTabbedPane.SCROLL_TAB_LAYOUT;

    // Please note: the ordering of the painting is important. 
    // we WANT to paint the outermost run first and then work our way in.
    int tabCount = tabPane.getTabCount();
    for (int i = runCount - 1; i >= 0; --i)
      {
        int start = tabRuns[i];
        int next;
        if (i == runCount - 1)
          next = tabRuns[0];
        else
          next = tabRuns[i + 1];
        int end = (next != 0 ? next - 1 : tabCount - 1);
        for (int j = start; j <= end; ++j)
          {
            if (j != selectedIndex)
              {
                paintTab(g, tabPlacement, rects, j, ir, tr);
              }
          }
      }

    // Paint selected tab in front of every other tab.
    if (selectedIndex >= 0)
      paintTab(g, tabPlacement, rects, selectedIndex, ir, tr);
  }

  /**
   * This method paints an individual tab.
   *
   * @param g The Graphics object to paint with.
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param rects The array of rectangles that keep the size and position of
   *        the tabs.
   * @param tabIndex The tab index to paint.
   * @param iconRect The rectangle to use for the icon.
   * @param textRect The rectangle to use for the text.
   */
  protected void paintTab(Graphics g, int tabPlacement, Rectangle[] rects,
                          int tabIndex, Rectangle iconRect, Rectangle textRect)
  {
    Rectangle rect = rects[tabIndex];
    boolean isSelected = tabIndex == tabPane.getSelectedIndex();
    // Paint background if necessary.
    if (tabsOpaque || tabPane.isOpaque())
      {
        paintTabBackground(g, tabPlacement, tabIndex, rect.x, rect.y,
                           rect.width, rect.height, isSelected);
      }

    // Paint border.
    paintTabBorder(g, tabPlacement, tabIndex, rect.x, rect.y, rect.width,
                   rect.height, isSelected);


    // Layout label.
    FontMetrics fm = getFontMetrics();
    Icon icon = getIconForTab(tabIndex);
    String title = tabPane.getTitleAt(tabIndex);
    layoutLabel(tabPlacement, fm, tabIndex, title, icon, rect, iconRect,
                textRect, isSelected);
    // Paint the text.
    paintText(g, tabPlacement, tabPane.getFont(), fm, tabIndex, title,
              textRect, isSelected);
    // Paint icon if necessary.
    paintIcon(g, tabPlacement, tabIndex, icon, iconRect, isSelected);
    // Paint focus indicator.
    paintFocusIndicator(g, tabPlacement, rects, tabIndex, iconRect, textRect,
                        isSelected);
  }

  /**
   * This method lays out the tab and finds the location to paint the  icon
   * and text.
   *
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param metrics The font metrics for the font to paint with.
   * @param tabIndex The tab index to paint.
   * @param title The string painted.
   * @param icon The icon painted.
   * @param tabRect The tab bounds.
   * @param iconRect The calculated icon bounds.
   * @param textRect The calculated text bounds.
   * @param isSelected Whether this tab is selected.
   */
  protected void layoutLabel(int tabPlacement, FontMetrics metrics,
                             int tabIndex, String title, Icon icon,
                             Rectangle tabRect, Rectangle iconRect,
                             Rectangle textRect, boolean isSelected)
  {
    SwingUtilities.layoutCompoundLabel(metrics, title, icon,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.RIGHT, tabRect,
                                       iconRect, textRect, textIconGap);

    int shiftX = getTabLabelShiftX(tabPlacement, tabIndex, isSelected);
    int shiftY = getTabLabelShiftY(tabPlacement, tabIndex, isSelected);

    iconRect.x += shiftX;
    iconRect.y += shiftY;

    textRect.x += shiftX;
    textRect.y += shiftY;
  }

  /**
   * This method paints the icon.
   *
   * @param g The Graphics object to paint.
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param tabIndex The tab index to paint.
   * @param icon The icon to paint.
   * @param iconRect The bounds of the icon.
   * @param isSelected Whether this tab is selected.
   */
  protected void paintIcon(Graphics g, int tabPlacement, int tabIndex,
                           Icon icon, Rectangle iconRect, boolean isSelected)
  {
    if (icon != null)
      icon.paintIcon(tabPane, g, iconRect.x, iconRect.y);
  }

  /**
   * This method paints the text for the given tab.
   *
   * @param g The Graphics object to paint with.
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param font The font to paint with.
   * @param metrics The fontmetrics of the given font.
   * @param tabIndex The tab index.
   * @param title The string to paint.
   * @param textRect The bounds of the string.
   * @param isSelected Whether this tab is selected.
   */
  protected void paintText(Graphics g, int tabPlacement, Font font,
                           FontMetrics metrics, int tabIndex, String title,
                           Rectangle textRect, boolean isSelected)
  {
    g.setFont(font);
    View textView = getTextViewForTab(tabIndex);
    if (textView != null)
      {
        textView.paint(g, textRect);
        return;
      }

    int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);
    if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex))
      {
        Color fg = tabPane.getForegroundAt(tabIndex);
        if (isSelected && (fg instanceof UIResource))
          {
            Color selectionForeground =
              UIManager.getColor("TabbedPane.selectionForeground");
            if (selectionForeground != null)
              fg = selectionForeground;
          }
        g.setColor(fg);

        if (mnemIndex != -1)
          BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex,
                                                       textRect.x,
                                                       textRect.y
                                                       + metrics.getAscent());
        else
          g.drawString(title, textRect.x, textRect.y + metrics.getAscent());
      }
    else
      {
        Color bg = tabPane.getBackgroundAt(tabIndex);
        g.setColor(bg.brighter());
        if (mnemIndex != -1)
          BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex,
                                                       textRect.x, textRect.y);
        else
          g.drawString(title, textRect.x, textRect.y);

        g.setColor(bg.darker());
        if (mnemIndex != -1)
          BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex,
                                                       textRect.x + 1,
                                                       textRect.y + 1);
        else
          g.drawString(title, textRect.x + 1, textRect.y + 1);
      }
  }

  /**
   * This method returns how much the label for the tab should shift in the X
   * direction.
   *
   * @param tabPlacement The JTabbedPane's tab placement.
   * @param tabIndex The tab index being painted.
   * @param isSelected Whether this tab is selected.
   *
   * @return The amount the labe