basicborders.java

gcc的JAVA模块的源代码

                           int x, int y,
                           Rectangle rect)
    {
      if (rect == null)
        return;

      /* On each edge, the border exceeds the enclosed child by one
       * pixel. See the image "BasicBorders.SplitPaneBorder-1.png" in
       * the directory "doc-files".
       */
      x += rect.x - 1;
      y += rect.y - 1;
      int right = x + rect.width + 1;
      int bottom = y + rect.height + 1;
      
      Color oldColor = g.getColor();
      try
      {
        g.setColor(shadow);
        if ((suppress & SUPPRESS_TOP) == 0)
          g.drawLine(x, y, right, y);
        if ((suppress & SUPPRESS_LEFT) == 0)
          g.drawLine(x, y, x, bottom);
        else
          g.drawLine(x, bottom, x, bottom); // one pixel

        g.setColor(highlight);
        if ((suppress & SUPPRESS_BOTTOM) == 0)
          g.drawLine(x + (shadeBottomLeftPixel ? 1 : 0), bottom, right, bottom);
        else if (!shadeBottomLeftPixel)
          g.drawLine(x, bottom, x, bottom); // one pixel

        if ((suppress & SUPPRESS_RIGHT) == 0)
          g.drawLine(right, y, right, bottom);
      }
      finally
      {
        g.setColor(oldColor);
      }
    }

    
    /**
     * Measures the width of this border.
     *
     * @param c the component whose border is to be measured, usually
     *        an instance of {@link javax.swing.JSplitPane}.
     *
     * @return an Insets object whose <code>left</code>,
     *         <code>right</code>, <code>top</code> and
     *         <code>bottom</code> fields indicate the width of the
     *         border at the respective edge.
     */
    public Insets getBorderInsets(Component c)
    {
      return new Insets(1, 1, 1, 1);
    }


    /**
     * Determines whether this border fills every pixel in its area
     * when painting.
     *
     * @return <code>false</code> because this border does not
     *         paint over the pixels where the divider joins
     *         the border.
     */
    public boolean isBorderOpaque()
    {
      /* Strangely, the Sun implementation (tested with JDK 1.3.1 and
       * 1.4.1_01) seems to always return true. It could be a bug,
       * but without knowing the details of their implementation, it is
       * hard to decide.
       */
      return false;
    }
  }


  /**
   * A border for the divider inside a JSplitPane.
   *
   * <p><img src="doc-files/BasicBorders.SplitPaneDividerBorder-1.png"
   * width="520" height="200" alt="[A screen shot of this border]" />
   *
   * @author Sascha Brawer ([e-mail])
   */
  private static class SplitPaneDividerBorder
    implements Border, UIResource, Serializable
  {
    /**
     * The highlight color, which is drawn on the left or top edge
     * depending on the orientation of the JSplitPanel.
     */
    protected Color highlight;


    /**
     * The highlight color, which is drawn on the right or bottom edge
     * depending on the orientation of the JSplitPanel.
     */
    protected Color shadow;


    /**
     * Constructs a new border for drawing the divider of a JSplitPane
     * in the Basic look and feel.  The outer parts of the JSplitPane have
     * their own border class, <code>SplitPaneBorder</code>.
     *
     * @param shadow the shadow color.
     * @param highlight the highlight color.
     */
    public SplitPaneDividerBorder(Color highlight, Color shadow)
    {
      this.highlight = (highlight != null) ? highlight : Color.white;
      this.shadow = (shadow != null) ? shadow : Color.black;
    }


    /**
     * Paints the border around the divider of a <code>JSplitPane</code>.
     *
     * <p><img src="doc-files/BasicBorders.SplitPaneDividerBorder-1.png"
     * width="520" height="200" alt="[A picture that shows which pixels
     * get painted in what color]" />
     *
     * @param c the <code>JSplitPane</code> whose divider&#x2019;s border
     *        is to be painted.
     * @param g the graphics for painting.
     * @param x the horizontal position for painting the border.
     * @param y the vertical position for painting the border.
     * @param width the width of the available area for painting the border.
     * @param height the height of the available area for painting the border.
     */
    public void paintBorder(Component c, Graphics  g,
                            int x, int y, int width, int height)
    {
      Color oldColor, dcol;
      int x2, y2;
      JSplitPane sp;

      sp = getSplitPane(c);
      if (sp == null)
        return;

      x2 = x + width - 1;
      y2 = y + height - 1;
      oldColor = g.getColor();
      dcol = c.getBackground();
      try
      {
        switch (sp.getOrientation())
        {
        case JSplitPane.HORIZONTAL_SPLIT:
          g.setColor(dcol);
          g.drawLine(x + 1, y, x2 - 1, y);
          g.drawLine(x + 1, y2, x2 - 1, y2);
          g.setColor(sp.getLeftComponent() != null ? highlight : dcol);
          g.drawLine(x, y, x, y2);
          g.setColor(sp.getRightComponent() != null ? shadow : dcol);
          g.drawLine(x2, y, x2, y2);
          break;

        case JSplitPane.VERTICAL_SPLIT:
          g.setColor(dcol);
          g.drawLine(x, y + 1, x, y2 - 1);
          g.drawLine(x2, y + 1, x2, y2 - 1);
          g.setColor(sp.getTopComponent() != null ? highlight : dcol);
          g.drawLine(x, y, x2, y);
          g.setColor(sp.getBottomComponent() != null ? shadow : dcol);
          g.drawLine(x, y2, x2, y2);
          break;
        }
      }
      finally
      {
        g.setColor(oldColor);
      }
    }


    /**
     * Measures the width of this border.
     *
     * @param c the component whose border is to be measured, usually
     *        an instance of {@link javax.swing.JSplitPane}.
     *
     * @return an Insets object whose <code>left</code>,
     *         <code>right</code>, <code>top</code> and
     *         <code>bottom</code> fields indicate the width of the
     *         border at the respective edge.
     */
    public Insets getBorderInsets(Component c)
    {
      return new Insets(1, 1, 1, 1);
    }


    /**
     * Determines whether this border fills every pixel in its area
     * when painting.
     *
     * @return <code>true</code> if both highlight and shadow
     *         color are fully opaque.
     */
    public boolean isBorderOpaque()
    {
      return (highlight.getAlpha() == 255) && (shadow.getAlpha() == 255);
    }

    
    /**
     * Determines the JSplitPane whose divider is being painted.
     *
     * @param c an instance of BasicSplitPaneDivider.
     *
     * @return a <code>JSplitPane</code>, or <code>null</code> if
     *         <code>c</code> is not an instance of {@link
     *         javax.swing.plaf.basic.BasicSplitPaneDivider}.
     */
    private JSplitPane getSplitPane(Component c)
    {
      if (c instanceof BasicSplitPaneDivider)
        return (((BasicSplitPaneDivider) c).getBasicSplitPaneUI())
          .getSplitPane();
      else
        return null;
    }
  }


  /**
   * A border for toggle buttons in the Basic look and feel.
   *
   * <p><img src="doc-files/BasicBorders.ToggleButtonBorder-1.png"
   * width="270" height="135" alt="[A screen shot of this border]" />
   *
   * <p>The Sun implementation always seems to draw exactly
   * the same border, irrespective of the state of the button.
   * This is rather surprising, but GNU Classpath emulates the
   * observable behavior.
   *
   * @see javax.swing.plaf.basic.BasicGraphicsUtils#drawBezel
   *
   * @author Sascha Brawer ([e-mail])
   */
  public static class ToggleButtonBorder
    extends ButtonBorder
  {
    /**
     * Determined using the <code>serialver</code> tool
     * of Apple/Sun JDK 1.3.1 on MacOS X 10.1.5.
     */
    static final long serialVersionUID = -3528666548001058394L;

    
    /**
     * Constructs a new border for drawing a JToggleButton in
     * the Basic look and feel.
     *
     * @param shadow the shadow color.
     * @param darkShadow a darker variant of the shadow color.
     * @param highlight the highlight color.
     * @param lightHighlight a brighter variant of the highlight  color.
     */
    public ToggleButtonBorder(Color shadow, Color darkShadow,
                              Color highlight, Color lightHighlight)
    {
      /* The superclass ButtonBorder substitutes null arguments
       * with fallback colors.
       */
      super(shadow, darkShadow, highlight, lightHighlight);
    }


    /**
     * Paints the ToggleButtonBorder around a given component.
     *
     * <p>The Sun implementation always seems to draw exactly
     * the same border, irrespective of the state of the button.
     * This is rather surprising, but GNU Classpath emulates the
     * observable behavior.
     *
     * @param c the component whose border is to be painted.
     * @param g the graphics for painting.
     * @param x the horizontal position for painting the border.
     * @param y the vertical position for painting the border.
     * @param width the width of the available area for painting the border.
     * @param height the height of the available area for painting the border.
     *
     * @see javax.swing.plaf.basic.BasicGraphicsUtils#drawBezel
     */
    public void paintBorder(Component c, Graphics  g,
                            int x, int y, int width, int height)
    {
      /* The author of this code tried various variants for setting
       * the state of the enclosed JToggleButton, but it seems that
       * the drawn border is always identical. Weird, because this
       * means that the user does not see whether the JToggleButton
       * is selected or not.
       */
      BasicGraphicsUtils.drawBezel(g, x, y, width, height,
                                   /* pressed */ false, 
                                   /* default */ false,
                                   shadow, darkShadow,
                                   highlight, lightHighlight);
    }


    /**
     * Measures the width of this border.
     *
     * @param c the component whose border is to be measured.
     *
     * @return an Insets object whose <code>left</code>,
     *         <code>right</code>, <code>top</code> and
     *         <code>bottom</code> fields indicate the width of the
     *         border at the respective edge.
     *
     * @see #getBorderInsets(java.awt.Component, java.awt.Insets) 
     */
    public Insets getBorderInsets(Component c)
    {
      /* There is no obvious reason for overriding this method, but we
       * try to have exactly the same API as the Sun reference
       * implementation.
       */
      return getBorderInsets(c, null);
    }

    
    /**
     * Measures the width of this border, storing the results into a
     * pre-existing Insets object.
     *
     * @param insets an Insets object for holding the result values.
     *        After invoking this method, the <code>left</code>,
     *        <code>right</code>, <code>top</code> and
     *        <code>bottom</code> fields indicate the width of the
     *        border at the respective edge.
     *
     * @return the same object that was passed for <code>insets</code>.
     *
     * @see #getBorderInsets()
     */
    public Insets getBorderInsets(Component c, Insets insets)
    {
      /* The exact amount has been determined using a test program
       * that was run on the Apple/Sun JDK 1.3.1 on MacOS X, and the
       * Sun JDK 1.4.1_01 on GNU/Linux for x86. Both gave [2,2,2,2].
       */
      if (insets == null)
        return new Insets(2, 2, 2, 2);

      insets.left = insets.right = insets.top = insets.bottom = 2;
      return insets;
    }
  }
}