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+/* TableView.java -- A view impl for tables inside styled text
+   Copyright (C) 2006 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 javax.swing.text;
+
+import java.awt.Rectangle;
+import java.awt.Shape;
+
+import javax.swing.SizeRequirements;
+import javax.swing.event.DocumentEvent;
+
+/**
+ * A {@link View} implementation for rendering tables inside styled text.
+ * Tables are rendered as vertical boxes (see {@link BoxView}). These boxes
+ * have a number of child views, which are the rows of the table. These are
+ * horizontal boxes containing the actuall cells of the table. These cells
+ * can be arbitrary view implementations and are fetched via the
+ * {@link ViewFactory} returned by {@link View#getViewFactory}.
+ *
+ * @author Roman Kennke (kennke@aicas.com)
+ */
+public abstract class TableView
+  extends BoxView
+{
+
+  /**
+   * A view implementation that renders a row of a <code>TableView</code>.
+   * This is implemented as a horizontal box that contains the actual cells
+   * of the table.
+   *
+   * @author Roman Kennke (kennke@aicas.com)
+   */
+  public class TableRow
+    extends BoxView
+  {
+    /**
+     * Creates a new instance of <code>TableRow</code>.
+     *
+     * @param el the element for which to create a row view
+     */
+    public TableRow(Element el)
+    {
+      super(el, X_AXIS);
+    }
+
+    /**
+     * Replaces some child views with a new set of child views. This is
+     * implemented to call the superclass behaviour and invalidates the row
+     * grid so that rows and columns will be recalculated.
+     *
+     * @param offset the start offset at which to replace views
+     * @param length the number of views to remove
+     * @param views the new set of views
+     */
+    public void replace(int offset, int length, View[] views)
+    {
+      super.replace(offset, length, views);
+      int viewCount = getViewCount();
+      if (columnRequirements == null
+          || viewCount > columnRequirements.length)
+        {
+          columnRequirements = new SizeRequirements[viewCount];
+          for (int i = 0; i < columnRequirements.length; i++)
+            columnRequirements[i] = new SizeRequirements();
+        }
+      if (columnOffsets == null || columnOffsets.length < viewCount)
+        columnOffsets = new int[viewCount];
+      if (columnSpans == null || columnSpans.length < viewCount)
+        columnSpans = new int[viewCount];
+      layoutChanged(X_AXIS);
+    }
+
+    /**
+     * Lays out the box's child views along the major axis. This is
+     * reimplemented so that the child views all have the width of their
+     * column.
+     *
+     * @param targetSpan the total span of the view
+     * @param axis the axis that is laid out
+     * @param offsets an array that holds the offsets of the child views after
+     *        this method returned
+     * @param spans an array that holds the spans of the child views after this
+     *        method returned
+     */
+    protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets,
+                                   int[] spans)
+    {
+      // Some sanity checks. If these preconditions are not met, then the
+      // following code will not work. Also, there must be something
+      // seriously wrong then.
+      assert(offsets.length == columnOffsets.length);
+      assert(spans.length == columnSpans.length);
+      assert(offsets.length == spans.length);
+      for (int i = 0; i < offsets.length; ++i)
+        {
+          offsets[i] = columnOffsets[i];
+          spans[i] = columnSpans[i];
+        }
+    }
+
+    /**
+     * Lays out the box's child views along the minor axis (the orthogonal axis
+     * to the major axis). This is reimplemented to call the super behaviour
+     * and then adjust the span of the child views that span multiple rows.
+     *
+     * @param targetSpan the total span of the view
+     * @param axis the axis that is laid out
+     * @param offsets an array that holds the offsets of the child views after
+     *        this method returned
+     * @param spans an array that holds the spans of the child views after this
+     *        method returned
+     */
+    protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets,
+                                   int[] spans)
+    {
+      // FIXME: Figure out how to fetch the row heights from the TableView's
+      // element.
+      super.layoutMinorAxis(targetSpan, axis, offsets, spans);
+    }
+
+    /**
+     * Determines the resizeability of this view along the specified axis.
+     *
+     * @param axis the axis of which to fetch the resizability
+     *
+     * @return the resize weight or &lt;= 0 if this view is not resizable
+     *
+     * @throws IllegalArgumentException when an illegal axis is specified
+     */
+    public int getResizeWeight(int axis)
+    {
+      // TODO: Figure out if this is ok. I would think so, but better test
+      // this.
+      return 0;
+    }
+
+    /**
+     * Returns the child view that represents the specified position in the
+     * model. This is reimplemented because in this view we do not necessarily
+     * have a one to one mapping of child elements to child views.
+     *
+     * @param pos the model position for which to query the view
+     * @param a the allocation of this view
+     *
+     * @return the view that corresponds to the specified model position or
+     *         <code>null</code> if there is none
+     */
+    protected View getViewAtPosition(int pos, Rectangle a)
+    {
+      // FIXME: Do not call super here. Instead walk through the child views
+      // and look for a range that contains the given position.
+      return super.getViewAtPosition(pos, a);
+    }
+  }
+
+  /**
+   * This class is deprecated and not used anymore. Table cells are
+   * rendered by an arbitrary <code>View</code> implementation.
+   *
+   * @author Roman Kennke (kennke@aicas.com)
+   *
+   * @deprecated Table cells are now rendered by an arbitrary <code>View</code>
+   *             implementation.
+   */
+  public class TableCell
+    extends BoxView
+  {
+
+    /**
+     * The row number of this cell.
+     */
+    private int row;
+
+    /**
+     * The column number of this cell.
+     */
+    private int column;
+
+    /**
+     * Creates a new instance.
+     *
+     * @param el the element
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public TableCell(Element el)
+    {
+      super(el, X_AXIS);
+    }
+
+    /**
+     * Returns the number of columns that this cell spans.
+     *
+     * @return the number of columns that this cell spans
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public int getColumnCount()
+    {
+      // TODO: Figure out if this is right. However, this is not so important
+      // since this class isn't used anyway (except maybe be application code
+      // that still uses this deprecated class).
+      return 1;
+    }
+
+    /**
+     * Returns the number of rows that this cell spans.
+     *
+     * @return the number of rows that this cell spans
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public int getRowCount()
+    {
+      // TODO: Figure out if this is right. However, this is not so important
+      // since this class isn't used anyway (except maybe be application code
+      // that still uses this deprecated class).
+      return 1;
+    }
+
+    /**
+     * Sets the grid location of this table cell.
+     *
+     * @param r the row of this cell
+     * @param c the column of this cell
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public void setGridLocation(int r, int c)
+    {
+      row = r;
+      column = c;
+    }
+
+    /**
+     * Returns the row number of this cell.
+     *
+     * @return the row number of this cell
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public int getGridRow()
+    {
+      return row;
+    }
+
+    /**
+     * Returns the column number of this cell.
+     *
+     * @return the column number of this cell
+     *
+     * @deprecated Table cells are now rendered by an arbitrary
+     *             <code>View</code> implementation.
+     */
+    public int getGridColumn()
+    {
+      return column;
+    }
+  }
+
+  /**
+   * The offsets of the columns of this table. Package private to avoid
+   * synthetic accessor methods.
+   */
+  int[] columnOffsets;
+
+  /**
+   * The spans of the columns of this table. Package private to avoid
+   * synthetic accessor methods.
+   */
+  int[] columnSpans;
+
+  /**
+   * The size requirements of the columns.
+   */
+  SizeRequirements[] columnRequirements = new SizeRequirements[0];
+
+  /**
+   * Creates a new instance of <code>TableView</code>.
+   *
+   * @param el the element for which to create a table view
+   */
+  public TableView(Element el)
+  {
+    super(el, Y_AXIS);
+  }
+
+  /**
+   * Replaces a number of child views with a set of new child views. This is
+   * implemented to call the superclass behaviour and invalidate the layout.
+   *
+   * @param offset the offset at which to replace child views
+   * @param length the number of child views to remove
+   * @param views the new set of views
+   */
+  public void replace(int offset, int length, View[] views)
+  {
+    super.replace(offset, length, views);
+    layoutChanged(Y_AXIS);
+  }
+
+  /**
+   * Creates a view for a table row.
+   *
+   * @param el the element that represents the table row
+   *
+   * @return a view for rendering the table row
+   */
+  protected TableRow createTableRow(Element el)
+  {
+    return new TableRow(el);
+  }
+
+  /**
+   * Creates a view for a table cell. This method is deprecated and not used
+   * anymore.
+   *
+   * @param el the element that represents the table cell
+   *
+   * @return a view for rendering the table cell
+   *
+   * @deprecated Table cells are now rendered by an arbitrary
+   *             <code>View</code> implementation.
+   */
+  protected TableCell createTableCell(Element el)
+  {
+    return new TableCell(el);
+  }
+
+  protected void forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e,
+                               Shape a, ViewFactory vf)
+  {
+    // TODO: Figure out what to do here.
+  }
+
+  /**
+   * Lays out the columns to fit within the specified target span.
+   *
+   * @param targetSpan the total span for the columns
+   * @param offsets an array that holds the offsets of the columns when this
+   *        method returns
+   * @param spans an array that holds the spans of the columns when this method
+   *        returns
+   * @param reqs the size requirements for each column
+   */
+  protected void layoutColumns(int targetSpan, int[] offsets, int spans[],
+                               SizeRequirements[] reqs)
+  {
+    updateColumnRequirements();
+    SizeRequirements r = calculateMinorAxisRequirements(X_AXIS, null);
+    SizeRequirements.calculateTiledPositions(targetSpan, r, columnRequirements,
+                                             offsets, spans);
+  }
+
+  /**
+   * Lays out the child views along the minor axis of the table (that is the
+   * horizontal axis). This is implemented to call {@link #layoutColumns} to
+   * layout the column layout of this table, and then forward to the superclass
+   * to actually lay out the rows.
+   *
+   * @param targetSpan the available span along the minor (horizontal) axis
+   * @param axis the axis
+   * @param offsets an array that holds the offsets of the columns when this
+   *        method returns
+   * @param spans an array that holds the spans of the columns when this method
+   *        returns
+   */
+  protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets,
+                                 int[] spans)
+  {
+    // TODO: Prepare size requirements for the columns.
+    layoutColumns(targetSpan, columnOffsets, columnSpans, columnRequirements);
+    super.layoutMinorAxis(targetSpan, axis, offsets, spans);
+  }
+
+  /**
+   * Calculates the requirements of this view for the minor (== horizontal)
+   * axis.
+   *
+   * This is reimplemented to calculate the requirements as the sum of the
+   * size requirements of the columns.
+   *
+   * @param axis the axis
+   * @param req the size requirements object to use, if <code>null</code> a new
+   *        one will be created
+   */
+  protected SizeRequirements calculateMinorAxisRequirements(int axis,
+                                                            SizeRequirements req)
+  {
+    // TODO: Maybe prepare columnRequirements.
+    SizeRequirements res = req;
+    if (res == null)
+      res = new SizeRequirements();
+    else
+      {
+        res.alignment = 0.5f;
+        res.maximum = 0;
+        res.minimum = 0;
+        res.preferred = 0;
+      }
+
+    for (int i = 0; i < columnRequirements.length; ++i)
+      {
+        res.minimum += columnRequirements[i].minimum;
+        res.preferred += columnRequirements[i].preferred;
+        res.maximum += columnRequirements[i].maximum;
+        // TODO: Do we have to handle alignment somehow?
+      }
+    return res;
+  }
+
+  /**
+   * Returns the child view that represents the specified position in the
+   * model. This is reimplemented because in this view we do not necessarily
+   * have a one to one mapping of child elements to child views.
+   *
+   * @param pos the model position for which to query the view
+   * @param a the allocation of this view
+   *
+   * @return the view that corresponds to the specified model position or
+   *         <code>null</code> if there is none
+   */
+  protected View getViewAtPosition(int pos, Rectangle a)
+  {
+    // FIXME: Do not call super here. Instead walk through the child views
+    // and look for a range that contains the given position.
+    return super.getViewAtPosition(pos, a);
+  }
+
+  /**
+   * Updates the column requirements.
+   */
+  private void updateColumnRequirements()
+  {
+    int rowCount = getViewCount();
+    for (int r = 0; r < rowCount; ++r)
+      {
+        TableRow row = (TableRow) getView(r);
+        int columnCount = row.getViewCount();
+        for (int c = 0; c < columnCount; ++c)
+          {
+            View cell = row.getView(c);
+            SizeRequirements cr = columnRequirements[c];
+            cr.minimum = Math.max(cr.minimum, (int) cell.getMinimumSpan(X_AXIS));
+            cr.preferred = Math.max(cr.preferred,
+                                    (int) cell.getPreferredSpan(X_AXIS));
+            cr.maximum = Math.max(cr.maximum, (int) cell.getMaximumSpan(X_AXIS));
+          }
+      }
+  }
+}