Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
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+/* LayoutManager2.java -- enhanced layout manager
+   Copyright (C) 1999, 2002 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt;
+
+/**
+ * Layout manager for laying out containers based on contraints. The
+ * constraints control how the layout will proceed.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @see LayoutManager
+ * @see Container
+ * @since 1.0
+ * @status updated to 1.4
+ */
+public interface LayoutManager2 extends LayoutManager
+{
+  /**
+   * Adds the specified component to the layout, with the specified
+   * constraints object.
+   *
+   * @param component the component to add
+   * @param constraints the constraints to satisfy
+   */
+  void addLayoutComponent(Component component, Object constraints);
+
+  /**
+   * Determines the maximum size of the specified target container.
+   *
+   * @param target the container to lay out
+   * @return the maximum size of the container
+   * @see Component#getMaximumSize()
+   */
+  Dimension maximumLayoutSize(Container target);
+
+  /**
+   * Returns the preferred X axis alignment for the specified target
+   * container.  This value will range from 0 to 1 where 0 is alignment
+   * closest to the origin, 0.5 is centered, and 1 is aligned furthest
+   * from the origin.
+   *
+   * @param target the target container
+   * @return the x-axis alignment preference
+   */
+  float getLayoutAlignmentX(Container target);
+
+  /**
+   * Returns the preferred Y axis alignment for the specified target
+   * container.  This value will range from 0 to 1 where 0 is alignment
+   * closest to the origin, 0.5 is centered, and 1 is aligned furthest
+   * from the origin.
+   *
+   * @param target the target container
+   * @return the y-axis alignment preference
+   */
+  float getLayoutAlignmentY(Container target);
+
+  /**
+   * Forces the layout manager to purge any cached information about the
+   * layout of the target container.  This will force it to be recalculated.
+   *
+   * @param target the target container
+   */
+  void invalidateLayout(Container target);
+} // interface LayoutManager2