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1 files changed, 365 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/FlowLayout.java b/libjava/classpath/java/awt/FlowLayout.java
new file mode 100644
index 000000000..231d041b1
--- /dev/null
+++ b/libjava/classpath/java/awt/FlowLayout.java
@@ -0,0 +1,365 @@
+/* FlowLayout.java -- Grid-based layout engine
+   Copyright (C) 1999, 2000, 2001, 2002, 2004  Free Software Foundation
+
+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;
+
+import java.io.Serializable;
+
+/** This class implements a flow-based layout.  Components are laid
+ * out in order from left to right.  When a component cannot be placed
+ * without horizontal clipping, a new row is started.  This class
+ * supports horizontal and vertical gaps.  These are used for spacing
+ * between components.
+ *
+ * @author Tom Tromey (tromey@redhat.com)
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public class FlowLayout implements LayoutManager, Serializable
+{
+  /** Constant that specifies left alignment.  */
+  public static final int LEFT = 0;
+  /** Constant that specifies center alignment.  */
+  public static final int CENTER = 1;
+  /** Constant that specifies right alignment.  */
+  public static final int RIGHT = 2;
+
+  /** Constant that specifies alignment to leading edge of container's
+   * orientation.  */
+  public static final int LEADING = 3;
+  /** Constant that specifies alignment to trailing edge of container's
+   * orientation.  */
+  public static final int TRAILING = 4;
+
+  // Serialization constant
+  private static final long serialVersionUID = -7262534875583282631L;
+
+  /**
+   * Add a new component to the layout.  This particular implementation
+   * does nothing.
+   *
+   * @param name the name
+   * @param comp the component
+   */
+  public void addLayoutComponent (String name, Component comp)
+  {
+    // Nothing.
+  }
+
+  /**
+   * Returns the current justification value for this object.
+   *
+   * @return The current justification value for this object.
+   */
+  public int getAlignment ()
+  {
+    return align;
+  }
+
+  /**
+   * Returns the horizontal gap between components.
+   *
+   * @return The horizontal gap between components.
+   */
+  public int getHgap ()
+  {
+    return hgap;
+  }
+
+  /**
+   * Returns the vertical gap between lines of components.
+   *
+   * @return The vertical gap between lines of components.
+   */
+  public int getVgap ()
+  {
+    return vgap;
+  }
+
+  /**
+   * Initializes a new instance of <code>FlowLayout</code> with a center
+   * justification and a default horizontal and vertical gap of 5.
+   */
+  public FlowLayout ()
+  {
+    this (CENTER, 5, 5);
+  }
+
+  /**
+   * Initializes a new instance of <code>FlowLayout</code> with the specified
+   * justification and a default horizontal and vertical gap of 5.
+   *
+   * @param align The justification setting, which should be one of the
+   * contants in this class.
+   */
+  public FlowLayout (int align)
+  {
+    this (align, 5, 5);
+  }
+
+  /**
+   * Initializes a new instance of <code>FlowLayout</code> with the specified
+   * justification and gap values
+   * @param align Alignment
+   * @param hgap The horizontal gap
+   * @param vgap The vertical gap
+   * @exception IllegalArgumentException If either gap is negative
+   */
+  public FlowLayout (int align, int hgap, int vgap)
+  {
+    // Use methods to set fields so that we can have all the checking
+    // in one place.
+    setVgap (vgap);
+    setHgap (hgap);
+    setAlignment (align);
+  }
+
+  /** Lay out the container's components based on current settings.
+   * @param parent The parent container
+   */
+  public void layoutContainer (Container parent)
+  {
+    synchronized (parent.getTreeLock ())
+      {
+        int num = parent.getComponentCount ();
+        // This is more efficient than calling getComponents().
+        Component[] comps = parent.component;
+
+        Dimension d = parent.getSize ();
+        Insets ins = parent.getInsets ();
+
+        ComponentOrientation orient = parent.getComponentOrientation ();
+        boolean left_to_right = orient.isLeftToRight ();
+
+        int y = ins.top + vgap;
+        int i = 0;
+        while (i < num)
+          {
+            // Find the components which go in the current row.
+            int new_w = ins.left + hgap + ins.right;
+            int new_h = 0;
+            int j;
+            boolean found_one = false;
+            for (j = i; j < num; ++j)
+              {
+                // Skip invisible items.
+                if (! comps[j].visible)
+                  continue;
+
+                Dimension c = comps[j].getPreferredSize ();
+
+                int next_w = new_w + hgap + c.width;
+                if (next_w <= d.width || ! found_one)
+                  {
+                    new_w = next_w;
+                    new_h = Math.max (new_h, c.height);
+                    found_one = true;
+                  }
+                else
+                  {
+                    // Must start a new row, and we already found an item
+                    break;
+                  }
+              }
+
+            // Set the location of each component for this row.
+            int x;
+
+            int myalign = align;
+            if (align == LEADING)
+              myalign = left_to_right ? LEFT : RIGHT;
+            else if (align == TRAILING)
+              myalign = left_to_right ? RIGHT : LEFT;
+
+            if (myalign == RIGHT)
+              x = ins.left + (d.width - new_w) + hgap;
+            else if (myalign == CENTER)
+              x = ins.left + (d.width - new_w) / 2 + hgap;
+            else // LEFT and all other values of align.
+              x = ins.left + hgap;
+
+            for (int k = i; k < j; ++k)
+              {
+                if (comps[k].visible)
+                  {
+                    Dimension c = comps[k].getPreferredSize ();
+                    comps[k].setBounds (x, y + (new_h - c.height) / 2,
+                                        c.width, c.height);
+                    x += c.width + hgap;
+                  }
+              }
+
+            // Advance to next row.
+            i = j;
+            y += new_h + vgap;
+          }
+      }
+  }
+
+  /**
+   * Returns the minimum layout size for the specified container using
+   * this layout.
+   * @param cont The parent container
+   * @return The minimum layout size.
+   */
+  public Dimension minimumLayoutSize (Container cont)
+  {
+    return getSize (cont, true);
+  }
+
+  /**
+   * Returns the preferred layout size for the specified container using
+   * this layout.
+   * @param cont The parent container
+   * @return The preferred layout size.
+   */
+  public Dimension preferredLayoutSize (Container cont)
+  {
+    return getSize (cont, false);
+  }
+
+  /** Remove the indicated component from this layout manager.
+   * This particular implementation does nothing.
+   * @param comp The component to remove
+   */
+  public void removeLayoutComponent (Component comp)
+  {
+    // Nothing.
+  }
+
+  /**
+   * Sets the justification value for this object to the specified value.
+   *
+   * @param align The new justification value for this object, which must
+   * be one of the constants in this class.
+   */
+  public void setAlignment (int align)
+  {
+    // The JDK accepts invalid values and treats them as
+    // LEFT during layout, so do we. The invalid value is even stored,
+    // getAlignment() returns the same invalid value.
+    this.align = align;
+  }
+
+  /**
+   * Sets the horizontal gap between lines of components to the specified value.
+   * No Exception is thrown if hgap < 0.
+   *
+   * @param hgap The new horizontal gap between components.
+   */
+  public void setHgap (int hgap)
+  {
+    this.hgap = hgap;
+  }
+
+  /**
+   * Sets the vertical gap between lines of components to the specified value.
+   * No Exception is thrown if vgap < 0.
+   *
+   * @param vgap The new vertical gap.
+   */
+  public void setVgap (int vgap)
+  {
+    this.vgap = vgap;
+  }
+
+  /** Return String description of this object.
+   * @return A string representation of this object.
+   */
+  public String toString ()
+  {
+    return ("[" + getClass ().getName () + ",hgap=" + hgap + ",vgap=" + vgap
+            + ",align=" + align + "]");
+  }
+
+  // This method is used to compute the various sizes.
+  private Dimension getSize (Container parent, boolean is_min)
+  {
+    synchronized (parent.getTreeLock ())
+      {
+        int w, h, num = parent.getComponentCount ();
+        // This is more efficient than calling getComponents().
+        Component[] comps = parent.component;
+
+        w = 0;
+        h = 0;
+        for (int i = 0; i < num; ++i)
+          {
+            if (! comps[i].visible)
+              continue;
+
+            // FIXME: can we just directly read the fields in Component?
+            // Or will that not work with subclassing?
+            Dimension d;
+
+            if (is_min)
+              d = comps[i].getMinimumSize ();
+            else
+              d = comps[i].getPreferredSize ();
+
+            w += d.width;
+            h = Math.max (d.height, h);
+          }
+
+        Insets ins = parent.getInsets ();
+
+        if (num == 0)
+          w += 2 * hgap + ins.left + ins.right;
+        else
+          w += (num + 1) * hgap + ins.left + ins.right;
+        h += 2 * vgap + ins.top + ins.bottom;
+
+        return new Dimension (w, h);
+      }
+  }
+
+  /**
+   * @serial The justification alignment of the lines of components, which
+   * will be one of the constants defined in this class.
+   */
+  private int align;
+
+  /**
+   * @serial The horizontal gap between components.
+   */
+  private int hgap;
+
+  /**
+   * @serial The vertical gap between lines of components.
+   */
+  private int vgap;
+}