defaultswatchchooserpanel.java

gcc的组建

    {
      super();
      numCols = 5;
      numRows = 7;
      initializeColors();
      revalidate();
    }

    /**
     * This method returns the color for the given position.
     *
     * @param x The x coordinate of the position.
     * @param y The y coordinate of the position.
     *
     * @return The color for the given position.
     */
    public Color getColorForPosition(int x, int y)
    {
      if (x % (cellWidth + gap) > cellWidth
          || y % (cellHeight + gap) > cellHeight)
	// position is located in gap.
	return null;

      int row = y / (cellHeight + gap);
      int col = x / (cellWidth + gap);

      return colors[getIndexForCell(row, col)];
    }

    /**
     * This method initializes the colors for the recent swatch panel.
     */
    protected void initializeColors()
    {
      colors = new Color[numRows * numCols];
      for (int i = 0; i < colors.length; i++)
	colors[i] = defaultColor;
    }

    /**
     * This method returns the array index for the given row and column.
     *
     * @param row The row.
     * @param col The column.
     *
     * @return The array index for the given row and column.
     */
    private int getIndexForCell(int row, int col)
    {
      return ((row * numCols) + col + start) % (numRows * numCols);
    }

    /**
     * This method adds the given color to the beginning of the swatch panel.
     * Package-private to avoid an accessor method.
     *
     * @param c The color to add.
     */
    void addColorToQueue(Color c)
    {
      if (--start == -1)
	start = numRows * numCols - 1;

      colors[start] = c;
    }

    /**
     * This method paints the panel with the given Graphics object.
     *
     * @param g The Graphics object to paint with.
     */
    public void paint(Graphics g)
    {
      Color saved = g.getColor();
      Insets insets = getInsets();
      int currX = insets.left;
      int currY = insets.top;

      for (int i = 0; i < numRows; i++)
        {
	  for (int j = 0; j < numCols; j++)
	    {
	      g.setColor(colors[getIndexForCell(i, j)]);
	      g.fill3DRect(currX, currY, cellWidth, cellHeight, true);
	      currX += cellWidth + gap;
	    }
	  currX = insets.left;
	  currY += cellWidth + gap;
        }
    }

    /**
     * This method returns the tooltip text for the given MouseEvent.
     *
     * @param e The MouseEvent.
     *
     * @return The tooltip text.
     */
    public String getToolTipText(MouseEvent e)
    {
      Color c = getColorForPosition(e.getX(), e.getY());
      if (c == null)
	return null;
      return c.getRed() + "," + c.getGreen() + "," + c.getBlue();
    }
  }

  /**
   * This class handles mouse events for the two swatch panels.
   */
  class MouseHandler extends MouseAdapter
  {
    /**
     * This method is called whenever the mouse is pressed.
     *
     * @param e The MouseEvent.
     */
    public void mousePressed(MouseEvent e)
    {
      SwatchPanel panel = (SwatchPanel) e.getSource();
      Color c = panel.getColorForPosition(e.getX(), e.getY());
      recentPalette.addColorToQueue(c);
      DefaultSwatchChooserPanel.this.getColorSelectionModel().setSelectedColor(c);
      DefaultSwatchChooserPanel.this.repaint();
    }
  }

  /**
   * This is the layout manager for the main panel.
   */
  static class MainPanelLayout implements LayoutManager
  {
    /**
     * This method is called when a new component is added to the container.
     *
     * @param name The name of the component.
     * @param comp The added component.
     */
    public void addLayoutComponent(String name, Component comp)
    {
      // Nothing to do here.
    }

    /**
     * This method is called to set the size and position of the child
     * components for the given container.
     *
     * @param parent The container to lay out.
     */
    public void layoutContainer(Container parent)
    {
      Component[] comps = parent.getComponents();
      Insets insets = parent.getInsets();
      Dimension[] pref = new Dimension[comps.length];

      int xpos = 0;
      int ypos = 0;
      int maxHeight = 0;
      int totalWidth = 0;

      for (int i = 0; i < comps.length; i++)
        {
	  pref[i] = comps[i].getPreferredSize();
	  if (pref[i] == null)
	    return;
	  maxHeight = Math.max(maxHeight, pref[i].height);
	  totalWidth += pref[i].width;
        }

      ypos = (parent.getSize().height - maxHeight) / 2 + insets.top;
      xpos = insets.left + (parent.getSize().width - totalWidth) / 2;

      for (int i = 0; i < comps.length; i++)
        {
	  if (pref[i] == null)
	    continue;
	  comps[i].setBounds(xpos, ypos, pref[i].width, pref[i].height);
	  xpos += pref[i].width;
        }
    }

    /**
     * This method is called when a component is removed from the container.
     *
     * @param comp The component that was removed.
     */
    public void removeLayoutComponent(Component comp)
    {
      // Nothing to do here.
    }

    /**
     * This methods calculates the minimum layout size for the container.
     *
     * @param parent The container.
     *
     * @return The minimum layout size.
     */
    public Dimension minimumLayoutSize(Container parent)
    {
      return preferredLayoutSize(parent);
    }

    /**
     * This method returns the preferred layout size for the given container.
     *
     * @param parent The container.
     *
     * @return The preferred layout size.
     */
    public Dimension preferredLayoutSize(Container parent)
    {
      int xmax = 0;
      int ymax = 0;

      Component[] comps = parent.getComponents();
      Dimension pref;

      for (int i = 0; i < comps.length; i++)
        {
	  pref = comps[i].getPreferredSize();
	  if (pref == null)
	    continue;
	  xmax += pref.width;
	  ymax = Math.max(ymax, pref.height);
        }

      Insets insets = parent.getInsets();

      return new Dimension(insets.left + insets.right + xmax,
                           insets.top + insets.bottom + ymax);
    }
  }

  /**
   * This is the layout manager for the recent swatch panel.
   */
  static class RecentPanelLayout implements LayoutManager
  {
    /**
     * This method is called when a component is added to the container.
     *
     * @param name The name of the component.
     * @param comp The added component.
     */
    public void addLayoutComponent(String name, Component comp)
    {
      // Nothing needs to be done.
    }

    /**
     * This method sets the size and position of the child components of the
     * given container.
     *
     * @param parent The container to lay out.
     */
    public void layoutContainer(Container parent)
    {
      Component[] comps = parent.getComponents();
      Dimension parentSize = parent.getSize();
      Insets insets = parent.getInsets();
      int currY = insets.top;
      Dimension pref;

      for (int i = 0; i < comps.length; i++)
        {
	  pref = comps[i].getPreferredSize();
	  if (pref == null)
	    continue;
	  comps[i].setBounds(insets.left, currY, pref.width, pref.height);
	  currY += pref.height;
        }
    }

    /**
     * This method calculates the minimum layout size for the given container.
     *
     * @param parent The container.
     *
     * @return The minimum layout size.
     */
    public Dimension minimumLayoutSize(Container parent)
    {
      return preferredLayoutSize(parent);
    }

    /**
     * This method calculates the preferred layout size for the given
     * container.
     *
     * @param parent The container.
     *
     * @return The preferred layout size.
     */
    public Dimension preferredLayoutSize(Container parent)
    {
      int width = 0;
      int height = 0;
      Insets insets = parent.getInsets();
      Component[] comps = parent.getComponents();
      Dimension pref;
      for (int i = 0; i < comps.length; i++)
        {
	  pref = comps[i].getPreferredSize();
	  if (pref != null)
	    {
	      width = Math.max(width, pref.width);
	      height += pref.height;
	    }
        }

      return new Dimension(width + insets.left + insets.right,
                           height + insets.top + insets.bottom);
    }

    /**
     * This method is called whenever a component is removed from the
     * container.
     *
     * @param comp The removed component.
     */
    public void removeLayoutComponent(Component comp)
    {
      // Nothing needs to be done.
    }
  }

  /**
   * Creates a new DefaultSwatchChooserPanel object.
   */
  DefaultSwatchChooserPanel()
  {
    super();
  }

  /**
   * This method updates the chooser panel with the new value from the
   * JColorChooser.
   */
  public void updateChooser()
  {
    // Nothing to do here yet.
  }

  /**
   * This method builds the chooser panel.
   */
  protected void buildChooser()
  {
    // The structure of the swatch panel is:
    // One large panel (minus the insets).
    // Inside that panel, there are two panels, one holds the palette.
    // The other holds the label and the recent colors palette.
    // The two palettes are two custom swatch panels.
    setLayout(new MainPanelLayout());

    JPanel mainPaletteHolder = new JPanel();
    JPanel recentPaletteHolder = new JPanel();

    mainPalette = new MainSwatchPanel();
    recentPalette = new RecentSwatchPanel();
    JLabel label = new JLabel("Recent:");

    mouseHandler = new MouseHandler();
    mainPalette.addMouseListener(mouseHandler);
    recentPalette.addMouseListener(mouseHandler);

    mainPaletteHolder.setLayout(new BorderLayout());
    mainPaletteHolder.add(mainPalette, BorderLayout.CENTER);

    recentPaletteHolder.setLayout(new RecentPanelLayout());
    recentPaletteHolder.add(label);
    recentPaletteHolder.add(recentPalette);

    JPanel main = new JPanel();
    main.add(mainPaletteHolder);
    main.add(recentPaletteHolder);

    this.add(main);
  }

  /**
   * This method removes the chooser panel from the JColorChooser.
   *
   * @param chooser The JColorChooser this panel is being removed from.
   */
  public void uninstallChooserPanel(JColorChooser chooser)
  {
    recentPalette = null;
    mainPalette = null;

    removeAll();
    super.uninstallChooserPanel(chooser);
  }

  /**
   * This method returns the JTabbedPane displayed name.
   *
   * @return The name displayed in the JTabbedPane.
   */
  public String getDisplayName()
  {
    return "Swatches";
  }

  /**
   * This method returns the small display icon.
   *
   * @return The small display icon.
   */
  public Icon getSmallDisplayIcon()
  {
    return null;
  }

  /**
   * This method returns the large display icon.
   *
   * @return The large display icon.
   */
  public Icon getLargeDisplayIcon()
  {
    return null;
  }

  /**
   * This method paints the chooser panel with the given Graphics object.
   *
   * @param g The Graphics object to paint with.
   */
  public void paint(Graphics g)
  {
    super.paint(g);
  }

  /**
   * This method returns the tooltip text for the given MouseEvent.
   *
   * @param e The MouseEvent.
   *
   * @return The tooltip text.
   */
  public String getToolTipText(MouseEvent e)
  {
    return null;
  }
}