basicprogressbarui.java

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· Java 代码 · 共 826 行 · 第 1/2 页

  /**
   * This method returns the Color that the text is shown in when the bar is
   * not over the text.
   *
   * @return The color of the text when the bar is not over it.
   */
  protected Color getSelectionBackground()
  {
    return selectionBackground;
  }

  /**
   * This method returns the Color that the text is shown in  when the bar is
   * over the text.
   *
   * @return The color of the text when the bar is over it.
   */
  protected Color getSelectionForeground()
  {
    return selectionForeground;
  }

  /**
   * This method returns the point (the top left of the bounding box)
   * where the text should be painted. 
   *
   * @param g The Graphics object to measure FontMetrics with.
   * @param progressString The string to paint.
   * @param x The x coordinate of the overall bounds box.
   * @param y The y coordinate of the overall bounds box.
   * @param width The width of the overall bounds box.
   * @param height The height of the overall bounds box.
   *
   * @return The top left of the bounding box where text should be painted.
   */
  protected Point getStringPlacement(Graphics g, String progressString, int x,
                                     int y, int width, int height)
  {
    Rectangle tr = new Rectangle();
    Rectangle vr = new Rectangle(x, y, width, height);
    Rectangle ir = new Rectangle();

    Font f = g.getFont();
    FontMetrics fm = g.getFontMetrics(f);

    SwingUtilities.layoutCompoundLabel(progressBar, fm, progressString, null,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER,
                                       SwingConstants.CENTER, vr, ir, tr, 0);
    return new Point(tr.x, tr.y);
  }

  /**
   * This method increments the animation index.
   */
  protected void incrementAnimationIndex()
  {
    animationIndex++;
    //numFrames is like string length, it should be named numFrames or something
    if (animationIndex >= numFrames)
      animationIndex = 0;
    progressBar.repaint();
  }

  /**
   * This method paints the progressBar. It delegates its responsibilities
   * to paintDeterminate and paintIndeterminate.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  public void paint(Graphics g, JComponent c)
  {
    if (! progressBar.isIndeterminate())
      paintDeterminate(g, c);
    else
      paintIndeterminate(g, c);
      
    if (progressBar.isBorderPainted())
      progressBar.getBorder().paintBorder(progressBar, g, 0, 0,
                                          progressBar.getWidth(),
					  progressBar.getHeight());
  }

  /**
   * This method is called if the painting to be done is 
   * for a determinate progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  protected void paintDeterminate(Graphics g, JComponent c)
  {
    Color saved = g.getColor();
    int space = getCellSpacing();
    int len = getCellLength();
    int max = progressBar.getMaximum();
    int min = progressBar.getMinimum();
    int value = progressBar.getValue();

    Rectangle vr = new Rectangle();
    SwingUtilities.calculateInnerArea(c, vr);

    Rectangle or = c.getBounds();

    Insets insets = c.getInsets();

    int amountFull = getAmountFull(insets, or.width, or.height);

    g.setColor(c.getBackground());
    g.fill3DRect(vr.x, vr.y, vr.width, vr.height, false);

    if (max != min && len != 0 && value > min)
      {
	int iterations = value / (space + len);

	if (progressBar.getOrientation() == JProgressBar.HORIZONTAL)
	  {
	    double spaceInUnits = space * (double) vr.width / (max - min);
	    double lenInUnits = len * (double) vr.width / (max - min);
	    double currX = vr.x;

	    g.setColor(c.getForeground());
	    g.fill3DRect(vr.x, vr.y, amountFull, vr.height, true);

	    g.setColor(c.getBackground());
	    if (spaceInUnits != 0)
	      {
		for (int i = 0; i < iterations; i++)
		  {
		    currX += lenInUnits;
		    g.fill3DRect((int) currX, vr.y, (int) spaceInUnits,
		                 vr.height, true);
		    currX += spaceInUnits;
		  }
	      }
	  }
	else
	  {
	    double currY = vr.y;
	    double spaceInUnits = space * (double) vr.height / (max - min);
	    double lenInUnits = len * (double) vr.height / (max - min);

	    g.setColor(c.getForeground());
	    g.fill3DRect(vr.x, vr.y + vr.height - amountFull, vr.width,
	                 amountFull, true);

	    g.setColor(c.getBackground());

	    if (spaceInUnits != 0)
	      {
		for (int i = 0; i < iterations; i++)
		  {
		    currY -= lenInUnits + spaceInUnits;
		    g.fill3DRect(vr.x, (int) currY, vr.width,
		                 (int) spaceInUnits, true);
		  }
	      }
	  }
      }

    if (progressBar.isStringPainted() && !progressBar.getString().equals(""))
      paintString(g, 0, 0, or.width, or.height, amountFull, insets);
    g.setColor(saved);
  }

  /**
   * This method is called if the painting to be done is for
   * an indeterminate progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param c The JComponent to paint.
   */
  protected void paintIndeterminate(Graphics g, JComponent c)
  {
    //need to paint the box at it's current position. no text is painted since
    //all we're doing is bouncing back and forth
    Color saved = g.getColor();
    Insets insets = c.getInsets();

    Rectangle or = c.getBounds();
    Rectangle vr = new Rectangle();
    SwingUtilities.calculateInnerArea(c, vr);

    g.setColor(c.getBackground());
    g.fill3DRect(vr.x, vr.y, vr.width, vr.height, false);

    Rectangle box = new Rectangle();
    getBox(box);

    g.setColor(c.getForeground());
    g.fill3DRect(box.x, box.y, box.width, box.height, true);

    if (progressBar.isStringPainted() && !progressBar.getString().equals(""))
      paintString(g, 0, 0, or.width, or.height,
                  getAmountFull(insets, or.width, or.height), insets);

    g.setColor(saved);
  }

  /**
   * This method paints the string for the progressBar.
   *
   * @param g The Graphics object to paint with.
   * @param x The x coordinate of the progressBar.
   * @param y The y coordinate of the progressBar.
   * @param width The width of the progressBar.
   * @param height The height of the progressBar.
   * @param amountFull The amount of the progressBar that has its bar filled.
   * @param b The insets of the progressBar.
   */
  protected void paintString(Graphics g, int x, int y, int width, int height,
                             int amountFull, Insets b)
  {
    // We want to place in the exact center of the bar.
    Point placement = getStringPlacement(g, progressBar.getString(),
                                         x + b.left, y + b.top,
                                         width - b.left - b.right,
                                         height - b.top - b.bottom);
    Color saved = g.getColor();

    // FIXME: The Color of the text should use selectionForeground and selectionBackground
    // but that can't be done right now, so we'll use white in the mean time.
    g.setColor(Color.WHITE);

    FontMetrics fm = g.getFontMetrics(progressBar.getFont());

    g.drawString(progressBar.getString(), placement.x,
                 placement.y + fm.getAscent());

    g.setColor(saved);
  }

  /**
   * This method sets the current animation index. If the index
   * is greater than the number of frames, it resets to 0.
   *
   * @param newValue The new animation index.
   */
  protected void setAnimationIndex(int newValue)
  {
    animationIndex = (newValue <= numFrames) ? newValue : 0;
    progressBar.repaint();
  }

  /**
   * This method sets the cell length.
   *
   * @param cellLen The cell length.
   */
  protected void setCellLength(int cellLen)
  {
    cellLength = cellLen;
  }

  /**
   * This method sets the cell spacing.
   *
   * @param cellSpace The cell spacing.
   */
  protected void setCellSpacing(int cellSpace)
  {
    cellSpacing = cellSpace;
  }

  /**
   * This method starts the animation timer. It is called
   * when the propertyChangeListener detects that the progressBar
   * has changed to indeterminate mode.
   *
   * @since 1.4
   */
  protected void startAnimationTimer()
  {
    if (animationTimer != null)
      animationTimer.start();
  }

  /**
   * This method stops the animation timer. It is called when
   * the propertyChangeListener detects that the progressBar
   * has changed to determinate mode.
   *
   * @since 1.4
   */
  protected void stopAnimationTimer()
  {
    if (animationTimer != null)
      animationTimer.stop();
    setAnimationIndex(0);
  }

  /**
   * This method changes the settings for the progressBar to
   * the defaults provided by the current Look and Feel.
   */
  protected void installDefaults()
  {
    UIDefaults defaults = UIManager.getLookAndFeelDefaults();

    progressBar.setFont(defaults.getFont("ProgressBar.font"));
    progressBar.setForeground(defaults.getColor("ProgressBar.foreground"));
    progressBar.setBackground(defaults.getColor("ProgressBar.background"));
    progressBar.setBorder(defaults.getBorder("ProgressBar.border"));
    progressBar.setOpaque(true);

    selectionForeground = defaults.getColor("ProgressBar.selectionForeground");
    selectionBackground = defaults.getColor("ProgressBar.selectionBackground");
    cellLength = defaults.getInt("ProgressBar.cellLength");
    cellSpacing = defaults.getInt("ProgressBar.cellSpacing");

    int repaintInterval = defaults.getInt("ProgressBar.repaintInterval");
    int cycleTime = defaults.getInt("ProgressBar.cycleTime");

    if (cycleTime % repaintInterval != 0
        && (cycleTime / repaintInterval) % 2 != 0)
      {
	int div = (cycleTime / repaintInterval) + 2;
	div /= 2;
	div *= 2;
	cycleTime = div * repaintInterval;
      }
    setAnimationIndex(0);
    numFrames = cycleTime / repaintInterval;
    animationTimer.setDelay(repaintInterval);
  }

  /**
   * The method uninstalls any defaults that were
   * set by the current Look and Feel.
   */
  protected void uninstallDefaults()
  {
    progressBar.setFont(null);
    progressBar.setForeground(null);
    progressBar.setBackground(null);

    selectionForeground = null;
    selectionBackground = null;
  }

  /**
   * This method registers listeners to all the 
   * components that this UI delegate needs to listen to.
   */
  protected void installListeners()
  {
    changeListener = new ChangeHandler();
    propertyListener = new PropertyChangeHandler();
    animation = new Animator();

    progressBar.addChangeListener(changeListener);
    progressBar.addPropertyChangeListener(propertyListener);
    animationTimer.addActionListener(animation);
  }

  /**
   * This method unregisters listeners to all the 
   * components that were listened to.
   */
  protected void uninstallListeners()
  {
    progressBar.removeChangeListener(changeListener);
    progressBar.removePropertyChangeListener(propertyListener);
    animationTimer.removeActionListener(animation);

    changeListener = null;
    propertyListener = null;
    animation = null;
  }

  /**
   * This method installs the UI for the given JComponent.
   * This includes setting up defaults and listeners as
   * well as initializing any values or objects that
   * the UI may need.
   *
   * @param c The JComponent that is having this UI installed.
   */
  public void installUI(JComponent c)
  {
    super.installUI(c);
    if (c instanceof JProgressBar)
      {
	progressBar = (JProgressBar) c;

	animationTimer = new Timer(200, null);
	animationTimer.setRepeats(true);

	installDefaults();
	installListeners();
      }
  }

  /**
   * This method removes the UI for the given JComponent.
   * This includes removing any listeners or defaults
   * that the installUI may have set up.
   *
   * @param c The JComponent that is having this UI uninstalled.
   */
  public void uninstallUI(JComponent c)
  {
    super.uninstallUI(c);
    uninstallListeners();
    uninstallDefaults();

    animationTimer = null;
    progressBar = null;
  }
}