+ * Warning:
+ * Serialized objects of this class will not be compatible with
+ * future Swing releases. The current serialization support is
+ * appropriate for short term storage or RMI between applications running
+ * the same version of Swing. As of 1.4, support for long term storage
+ * of all JavaBeansTM
+ * has been added to the java.beans package.
+ * Please see {@link java.beans.XMLEncoder}.
+ *
+ * @author David Kloba
+ */
+public abstract class AbstractBorder implements Border, Serializable
+{
+ /**
+ * This default implementation does no painting.
+ * @param c the component for which this border is being painted
+ * @param g the paint graphics
+ * @param x the x position of the painted border
+ * @param y the y position of the painted border
+ * @param width the width of the painted border
+ * @param height the height of the painted border
+ */
+ public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
+ }
+
+ /**
+ * This default implementation returns a new {@link Insets} object
+ * that is initialized by the {@link #getBorderInsets(Component,Insets)}
+ * method.
+ * By default the {@code top}, {@code left}, {@code bottom},
+ * and {@code right} fields are set to {@code 0}.
+ *
+ * @param c the component for which this border insets value applies
+ * @return a new {@link Insets} object
+ */
+ public Insets getBorderInsets(Component c) {
+ return getBorderInsets(c, new Insets(0, 0, 0, 0));
+ }
+
+ /**
+ * Reinitializes the insets parameter with this Border's current Insets.
+ * @param c the component for which this border insets value applies
+ * @param insets the object to be reinitialized
+ * @return the insets object
+ */
+ public Insets getBorderInsets(Component c, Insets insets) {
+ insets.left = insets.top = insets.right = insets.bottom = 0;
+ return insets;
+ }
+
+ /**
+ * This default implementation returns false.
+ * @return false
+ */
+ public boolean isBorderOpaque() { return false; }
+
+ /**
+ * This convenience method calls the static method.
+ * @param c the component for which this border is being computed
+ * @param x the x position of the border
+ * @param y the y position of the border
+ * @param width the width of the border
+ * @param height the height of the border
+ * @return a Rectangle containing the interior coordinates
+ */
+ public Rectangle getInteriorRectangle(Component c, int x, int y, int width, int height) {
+ return getInteriorRectangle(c, this, x, y, width, height);
+ }
+
+ /**
+ * Returns a rectangle using the arguments minus the
+ * insets of the border. This is useful for determining the area
+ * that components should draw in that will not intersect the border.
+ * @param c the component for which this border is being computed
+ * @param b the Border object
+ * @param x the x position of the border
+ * @param y the y position of the border
+ * @param width the width of the border
+ * @param height the height of the border
+ * @return a Rectangle containing the interior coordinates
+ */
+ public static Rectangle getInteriorRectangle(Component c, Border b, int x, int y, int width, int height) {
+ Insets insets;
+ if(b != null)
+ insets = b.getBorderInsets(c);
+ else
+ insets = new Insets(0, 0, 0, 0);
+ return new Rectangle(x + insets.left,
+ y + insets.top,
+ width - insets.right - insets.left,
+ height - insets.top - insets.bottom);
+ }
+
+ /**
+ * Returns the baseline. A return value less than 0 indicates the border
+ * does not have a reasonable baseline.
+ *
+ * The default implementation returns -1. Subclasses that support
+ * baseline should override appropriately. If a value >= 0 is
+ * returned, then the component has a valid baseline for any
+ * size >= the minimum size and getBaselineResizeBehavior
+ * can be used to determine how the baseline changes with size.
+ *
+ * @param c Component baseline is being requested for
+ * @param width the width to get the baseline for
+ * @param height the height to get the baseline for
+ * @return the baseline or < 0 indicating there is no reasonable
+ * baseline
+ * @throws IllegalArgumentException if width or height is < 0
+ * @see java.awt.Component#getBaseline(int,int)
+ * @see java.awt.Component#getBaselineResizeBehavior()
+ * @since 1.6
+ */
+ public int getBaseline(Component c, int width, int height) {
+ if (width < 0 || height < 0) {
+ throw new IllegalArgumentException(
+ "Width and height must be >= 0");
+ }
+ return -1;
+ }
+
+ /**
+ * Returns an enum indicating how the baseline of a component
+ * changes as the size changes. This method is primarily meant for
+ * layout managers and GUI builders.
+ *
+ * The default implementation returns
+ * BaselineResizeBehavior.OTHER, subclasses that support
+ * baseline should override appropriately. Subclasses should
+ * never return null; if the baseline can not be
+ * calculated return BaselineResizeBehavior.OTHER. Callers
+ * should first ask for the baseline using
+ * getBaseline and if a value >= 0 is returned use
+ * this method. It is acceptable for this method to return a
+ * value other than BaselineResizeBehavior.OTHER even if
+ * getBaseline returns a value less than 0.
+ *
+ * @param c Component to return baseline resize behavior for
+ * @return an enum indicating how the baseline changes as the border is
+ * resized
+ * @see java.awt.Component#getBaseline(int,int)
+ * @see java.awt.Component#getBaselineResizeBehavior()
+ * @since 1.6
+ */
+ public Component.BaselineResizeBehavior getBaselineResizeBehavior(
+ Component c) {
+ if (c == null) {
+ throw new NullPointerException("Component must be non-null");
+ }
+ return Component.BaselineResizeBehavior.OTHER;
+ }
+
+ /*
+ * Convenience function for determining ComponentOrientation.
+ * Helps us avoid having Munge directives throughout the code.
+ */
+ static boolean isLeftToRight( Component c ) {
+ return c.getComponentOrientation().isLeftToRight();
+ }
+
+}