tablelayout.java

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                    entry.col1--;

                // Is the second column to the right of the new column
                if (entry.col2 >= i)
                    // Move second column
                    entry.col2--;
            }

        // Indicate that the cell sizes are not known
        dirty = true;
    }



    /**
     * Deletes a row in this layout.  All components below the deletion point are
     * moved up one row.  The container will need to be laid out after this method
     * returns.  See <code>setRow</code>.  There must be at least two rows in order
     * to delete a row.
     *
     * @param i    zero-based index of column to delete
     *
     * @see setRow
     * @see deleteRow
     */

    public void deleteRow (int i)
    {
        // Make sure position is valid
        if ((i < 0) || (i >= rowSpec.length))
            throw new IllegalArgumentException
                ("Parameter i is invalid.  i = " + i + ".  Valid range is [0, " +
                 (rowSpec.length - 1) + "].");

        // Copy rows
        double row[] = new double[rowSpec.length - 1];
        System.arraycopy (rowSpec, 0, row, 0, i);
        System.arraycopy (rowSpec, i + 1, row, i, rowSpec.length - i - 1);

        // Delete row
        rowSpec = row;

        // Move all components that are to below the row deleted
        ListIterator iterator = list.listIterator(0);
    
        while (iterator.hasNext())
            {
                // Get next entry
                Entry entry = (Entry) iterator.next();

                // Is the first row below the new row
                if (entry.row1 >= i)
                    // Move first row
                    entry.row1--;

                // Is the second row below the new row
                if (entry.row2 >= i)
                    // Move second row
                    entry.row2--;
            }

        // Indicate that the cell sizes are not known
        dirty = true;
    }



    //******************************************************************************
    //** Misc methods                                                            ***
    //******************************************************************************



    /**
     * Converts this TableLayout to a string.
     *
     * @return a string representing the columns and row sizes in the form
     *         "{{col0, col1, col2, ..., colN}, {row0, row1, row2, ..., rowM}}"
     */

    public String toString ()
    {
        int counter;

        String value = "TableLayout {{";

        if (columnSpec.length > 0)
            {
                for (counter = 0; counter < columnSpec.length - 1; counter++)
                    value += columnSpec[counter] + ", ";

                value += columnSpec[columnSpec.length - 1] + "}, {";
            }
        else
            value += "}, {";

        if (rowSpec.length > 0)
            {
                for (counter = 0; counter < rowSpec.length - 1; counter++)
                    value += rowSpec[counter] + ", ";

                value += rowSpec[rowSpec.length - 1] + "}}";
            }
        else
            value += "}}";

        return value;
    }



    /**
     * Draws a grid on the given container.  This is useful for seeing where the
     * rows and columns go.  In the container's paint method, call this method.
     *
     * @param container    container using this TableLayout
     * @param g            graphics content of container (can be offscreen)
     */

    public void drawGrid (Container container, Graphics g)
    {
        int counter; // Counting variable;

        // Calculate the sizes of the rows and columns
        Dimension d = container.getSize();

        if (dirty || (d.width != oldWidth) || (d.height != oldHeight))
            calculateSize (container);

        // Initialize y
        int y = 0;

        for (int row = 0; row < rowSize.length; row++)
            {
                // Initialize x
                int x = 0;

                for (int column = 0; column < columnSize.length; column++)
                    {
                        // Use a random color to make things easy to see
                        Color color = new Color((int) (Math.random() * 0xFFFFFFL));
                        g.setColor (color);

                        // Draw the cell as a solid rectangle
                        g.fillRect (x, y, columnSize[column], rowSize[row]);

                        // Increment x
                        x += columnSize[column];
                    }

                // Increment y
                y += rowSize[row];
            }
    }



    /**
     * Determines whether or not there are any hidden components.  A hidden
     * component is one that will not be shown with this layout's current
     * configuration.  Such a component is, at least partly, in an invalid row
     * or column.  For example, on a table with five rows, row -1 and row 5 are both
     * invalid.  Valid rows are 0 through 4, inclusively.
     *
     * @return    True, if there are any hidden components.  False, otherwise.
     *
     * @see overlapping
     */

    public boolean hidden ()
    {
        // Assume no components are hidden
        boolean hidden = false;

        // Check all components
        ListIterator iterator = list.listIterator(0);
    
        while (iterator.hasNext())
            {
                // Get next entry
                Entry entry = (Entry) iterator.next();

                // Is this component valid
                if ((entry.row1 < 0) || (entry.col1 < 0) ||
                    (entry.row2 > rowSpec.length) ||
                    (entry.col2 > columnSpec.length))
                    {
                        hidden = true;
                        break;
                    }
            }

        return hidden;
    }



    /**
     * Determines whether or not there are any overlapping components.  Two
     * components overlap if they cover at least one common cell.
     *
     * @return    True, if there are any overlapping components.  False, otherwise.
     *
     * @see hidden
     */

    public boolean overlapping ()
    {
        // Count contraints
        int numEntry = list.size();

        // If there are no components, they can't be overlapping
        if (numEntry == 0)
            return false;

        // Assume no components are overlapping
        boolean overlapping = false;

        // Put entries in an array
        Entry entry[] = (Entry[]) list.toArray(new Entry[numEntry]);

        // Check all components
        for (int knowUnique = 1; knowUnique < numEntry; knowUnique++)
            for (int checking = knowUnique - 1; checking >= 0; checking--)
                if
                    (
                     (
                      (entry[checking].col1 >= entry[knowUnique].col1) &&
                      (entry[checking].col1 <= entry[knowUnique].col2) &&
                      (entry[checking].row1 >= entry[knowUnique].row1) &&
                      (entry[checking].row1 <= entry[knowUnique].row2)
                      )
                     ||
                     (
                      (entry[checking].col2 >= entry[knowUnique].col1) &&
                      (entry[checking].col2 <= entry[knowUnique].col2) &&
                      (entry[checking].row2 >= entry[knowUnique].row1) &&
                      (entry[checking].row2 <= entry[knowUnique].row2)
                      )
                     )
                    {
                        overlapping = true;
                        break;
                    }

        return overlapping;
    }



    /**
     * Calculates the sizes of the rows and columns based on the absolute and
     * relative sizes specified in <code>rowSpec</code> and <code>columnSpec</code>
     * and the size of the container.  The result is stored in <code>rowSize</code>
     * and <code>columnSize</code>.
     *
     * @param container    container using this TableLayout
     */

    protected void calculateSize (Container container)
    {
        int counter; // Counting variable;

        // Get number of rows and columns
        int numColumn = columnSpec.length;
        int numRow = rowSpec.length;

        // Create array to hold actual sizes in pixels
        columnSize = new int[numColumn];
        rowSize = new int[numRow];

        // Get the container's insets
        Insets inset = container.getInsets();

        // Get the size of the container's available space
        Dimension d = container.getSize();
        int totalWidth = d.width - inset.left - inset.right;
        int totalHeight = d.height - inset.top - inset.bottom;

        // Initially, the available space is the total space
        int availableWidth = totalWidth;
        int availableHeight = totalHeight;

        // Assign absolute widths; this reduces available width
        for (counter = 0; counter < numColumn; counter++)
            // Is the current column an absolue size
            if ((columnSpec[counter] >= 1.0) || (columnSpec[counter] == 0.0))
                {
                    // Assign absolute width
                    columnSize[counter] = (int) (columnSpec[counter] + 0.5);

                    // Reduce available width
                    availableWidth -= columnSize[counter];
                }

        // Assign absolute heights; this reduces available height
        for (counter = 0; counter < numRow; counter++)
            // Is the current column an absolue size
            if ((rowSpec[counter] >= 1.0) || (rowSpec[counter] == 0.0))
                {
                    // Assign absolute width
                    rowSize[counter] = (int) (rowSpec[counter] + 0.5);

                    // Reduce available width
                    availableHeight -= rowSize[counter];
                }

        // Assign preferred and minimum widths; this reduces available width.
        // Assignment of preferred/minimum with is like assignment of absolute
        // widths except that each column must determine the maximum
        // preferred/minimum width of the components that are completely contained
        // within the column.
        for (counter = 0; counter < numColumn; counter++)
            // Is the current column a preferred size
            if ((columnSpec[counter] == PREFERRED) ||
                (columnSpec[counter] == MINIMUM))
                {
                    // Assume a maximum width of zero
                    int maxWidth = 0;

                    // Find maximum preferred width of all components completely
                    // contained within this column
                    ListIterator iterator = list.listIterator(0);
    
                    while (iterator.hasNext())
                        {
                            Entry entry = (Entry) iterator.next();

                            if ((entry.col1 == counter) && (entry.col2 == counter))
                                {
                                    Dimension p = (columnSpec[counter] == PREFERRED) ?
                                        entry.component.getPreferredSize() :
                                        entry.component.getMinimumSize();

                                    int width = (p == null) ? 0 : p.width;

                                    if (maxWidth < width)
                                        maxWidth = width;
                                }
                        }

                    // Assign preferred width
                    columnSize[counter] = maxWidth;

                    // Reduce available width
                    availableWidth -= maxWidth;
                }

        // Assign preferred and minimum heights; this reduces available height.
        // Assignment of preferred/minimum with is like assignment of absolute
        // heights except that each row must determine the maximum
        // preferred/minimum height of the components that are completely contained
        // within the row.
        for (counter = 0; counter < numRow; counter++)
            // Is the current row a preferred size
            if ((rowSpec[counter] == PREFERRED) ||
                (rowSpec[counter] == MINIMUM))
                {
                    // Assume a maximum height of zero
                    int maxHeight = 0;

                    // Find maximum preferred height of all components completely