GridBagLayout (Java 2 Platform SE v1.4.1_"07")

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JavaTM 2 Platform
Std. Ed. v1.4.1_"07"

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## java.awt
Class GridBagLayout

    java.lang.Object
      |
      +--java.awt.GridBagLayout

All Implemented Interfaces:
  LayoutManager, LayoutManager2, Serializable

public class GridBagLayout
extends Object
implements LayoutManager2, Serializable

The `GridBagLayout` class is a flexible layout manager that aligns components vertically and horizontally, without requiring that the components be of the same size. Each `GridBagLayout` object maintains a dynamic, rectangular grid of cells, with each component occupying one or more cells, called its display area.

Each component managed by a `GridBagLayout` is associated with an instance of `GridBagConstraints`. The constraints object specifies where a component's display area should be located on the grid and how the component should be positioned within its display area. In addition to its constraints object, the `GridBagLayout` also considers each component's minimum and preferred sizes in order to determine a component's size.

The overall orientation of the grid depends on the container's `ComponentOrientation` property. For horizontal left-to-right orientations, grid coordinate (0,0) is in the upper left corner of the container with x increasing to the right and y increasing downward. For horizontal right-to-left orientations, grid coordinate (0,0) is in the upper right corner of the container with x increasing to the left and y increasing downward.

To use a grid bag layout effectively, you must customize one or more of the `GridBagConstraints` objects that are associated with its components. You customize a `GridBagConstraints` object by setting one or more of its instance variables:

`GridBagConstraints.gridx`, `GridBagConstraints.gridy`
  Specifies the cell containing the leading corner of the component's display area, where the cell at the origin of the grid has address `gridx = 0`, `gridy = 0`. For horizontal left-to-right layout, a component's leading corner is its upper left. For horizontal right-to-left layout, a component's leading corner is its upper right. Use `GridBagConstraints.RELATIVE` (the default value) to specify that the component be placed immediately following (along the x axis for `gridx` or the y axis for `gridy`) the component that was added to the container just before this component was added.
`GridBagConstraints.gridwidth`, `GridBagConstraints.gridheight`
  Specifies the number of cells in a row (for `gridwidth`) or column (for `gridheight`) in the component's display area. The default value is 1. Use `GridBagConstraints.REMAINDER` to specify that the component be the last one in its row (for `gridwidth`) or column (for `gridheight`). Use `GridBagConstraints.RELATIVE` to specify that the component be the next to last one in its row (for `gridwidth`) or column (for `gridheight`).
`GridBagConstraints.fill`
  Used when the component's display area is larger than the component's requested size to determine whether (and how) to resize the component. Possible values are `GridBagConstraints.NONE` (the default), `GridBagConstraints.HORIZONTAL` (make the component wide enough to fill its display area horizontally, but don't change its height), `GridBagConstraints.VERTICAL` (make the component tall enough to fill its display area vertically, but don't change its width), and `GridBagConstraints.BOTH` (make the component fill its display area entirely).
`GridBagConstraints.ipadx`, `GridBagConstraints.ipady`
  Specifies the component's internal padding within the layout, how much to add to the minimum size of the component. The width of the component will be at least its minimum width plus `(ipadx * 2)` pixels (since the padding applies to both sides of the component). Similarly, the height of the component will be at least the minimum height plus `(ipady * 2)` pixels.
`GridBagConstraints.insets`
  Specifies the component's external padding, the minimum amount of space between the component and the edges of its display area.
`GridBagConstraints.anchor`
  Used when the component is smaller than its display area to determine where (within the display area) to place the component. There are two kinds of possible values: relative and absolute. Relative values are interpreted relative to the container's `ComponentOrientation` property while absolute values are not. Valid values are:

Absolute Values | Relative Values

- `GridBagConstraints.NORTH`
- `GridBagConstraints.SOUTH`
- `GridBagConstraints.WEST`
- `GridBagConstraints.EAST`
- `GridBagConstraints.NORTHWEST`
- `GridBagConstraints.NORTHEAST`
- `GridBagConstraints.SOUTHWEST`
- `GridBagConstraints.SOUTHEAST`
- `GridBagConstraints.CENTER` (the default)

- `GridBagConstraints.PAGE_START`
- `GridBagConstraints.PAGE_END`
- `GridBagConstraints.LINE_START`
- `GridBagConstraints.LINE_END`
- `GridBagConstraints.FIRST_LINE_START`
- `GridBagConstraints.FIRST_LINE_END`
- `GridBagConstraints.LAST_LINE_START`
- `GridBagConstraints.LAST_LINE_END`

`GridBagConstraints.weightx`, `GridBagConstraints.weighty`
  Used to determine how to distribute space, which is important for specifying resizing behavior. Unless you specify a weight for at least one component in a row (`weightx`) and column (`weighty`), all the components clump together in the center of their container. This is because when the weight is zero (the default), the `GridBagLayout` object puts any extra space between its grid of cells and the edges of the container.

The following figures show ten components (all buttons) managed by a grid bag layout. Figure 1 shows the layout for a horizontal, left-to-right container and Figure 2 shows the layout for a horizontal, right-to-left container.

Figure 1: Horizontal, Left-to-Right | Figure 2: Horizontal, Right-to-Left

Each of the ten components has the `fill` field of its associated `GridBagConstraints` object set to `GridBagConstraints.BOTH`. In addition, the components have the following non-default constraints:

- Button1, Button2, Button3: `weightx = 1.0`
- Button4: `weightx = 1.0`, `gridwidth = GridBagConstraints.REMAINDER`
- Button5: `gridwidth = GridBagConstraints.REMAINDER`
- Button6: `gridwidth = GridBagConstraints.RELATIVE`
- Button7: `gridwidth = GridBagConstraints.REMAINDER`
- Button8: `gridheight = 2`, `weighty = 1.0`
- Button9, Button 10: `gridwidth = GridBagConstraints.REMAINDER`

Here is the code that implements the example shown above:

>      import java.awt.*;
>      import java.util.*;
>      import java.applet.Applet;

>      public class GridBagEx1 extends Applet {

>          protected void makebutton(String name,
>                                    GridBagLayout gridbag,
>                                    GridBagConstraints c) {
>              Button button = new Button(name);
>              gridbag.setConstraints(button, c);
>              add(button);
>          }

>          public void init() {
>              GridBagLayout gridbag = new GridBagLayout();
>              GridBagConstraints c = new GridBagConstraints();

>              setFont(new Font("Helvetica", Font.PLAIN, 14));
>              setLayout(gridbag);

>              c.fill = GridBagConstraints.BOTH;
>              c.weightx = 1.0;
>              makebutton("Button1", gridbag, c);
>              makebutton("Button2", gridbag, c);
>              makebutton("Button3", gridbag, c);

>          	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
>              makebutton("Button4", gridbag, c);

>              c.weightx = 0.0;		   //reset to the default
>              makebutton("Button5", gridbag, c); //another row

>      	   c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
>              makebutton("Button6", gridbag, c);

>      	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
>              makebutton("Button7", gridbag, c);

>      	   c.gridwidth = 1;	   	   //reset to the default
>      	   c.gridheight = 2;
>              c.weighty = 1.0;
>              makebutton("Button8", gridbag, c);

>              c.weighty = 0.0;		   //reset to the default
>      	   c.gridwidth = GridBagConstraints.REMAINDER; //end row
>      	   c.gridheight = 1;		   //reset to the default
>              makebutton("Button9", gridbag, c);
>              makebutton("Button10", gridbag, c);

>              setSize(300, 100);
>          }

>          public static void main(String args[]) {
>      	   Frame f = new Frame("GridBag Layout Example");
>      	   GridBagEx1 ex1 = new GridBagEx1();

>      	   ex1.init();

>      	   f.add("Center", ex1);
>      	   f.pack();
>      	   f.setSize(f.getPreferredSize());
>      	   f.show();
>          }
>      }

Since:
  JDK1.0
See Also:
  `GridBagConstraints`, `ComponentOrientation`, Serialized Form

Field Summary
`double[]` | `columnWeights` This field holds the overrides to the column weights.
`int[]` | `columnWidths` This field holds the overrides to the column minimum width.
`protected Hashtable` | `comptable` This hashtable maintains the association between a component and its gridbag constraints.
`protected GridBagConstraints` | `defaultConstraints` This field holds a gridbag constraints instance containing the default values, so if a component does not have gridbag constraints associated with it, then the component will be assigned a copy of the `defaultConstraints`.
`protected java.awt.GridBagLayoutInfo` | `layoutInfo` This field holds the layout information for the gridbag.
`protected static int` | `MAXGRIDSIZE` The maximum number of grid positions (both horizontally and vertically) that can be laid out by the grid bag layout.
`protected static int` | `MINSIZE` The smallest grid that can be laid out by the grid bag layout.
`protected static int` | `PREFERREDSIZE` The preferred grid size that can be laid out by the grid bag layout.
`int[]` | `rowHeights` This field holds the overrides to the row minimum heights.
`double[]` | `rowWeights` This field holds the overrides to the row weights.

Constructor Summary
`GridBagLayout()` Creates a grid bag layout manager.

Method Summary
`void` | `addLayoutComponent(Component comp, Object constraints)` Adds the specified component to the layout, using the specified `constraints` object.
`void` | `addLayoutComponent(String name, Component comp)` Adds the specified component with the specified name to the layout.
`protected void` | `adjustForGravity(GridBagConstraints constraints, Rectangle r)` Adjusts the x, y, width, and height fields to the correct values depending on the constraint geometry and pads.
`protected void` | `AdjustForGravity(GridBagConstraints constraints, Rectangle r)` This method is obsolete and supplied for backwards compatability only; new code should call `adjustForGravity` instead.
`protected void` | `arrangeGrid(Container parent)` Lays out the grid.
`protected void` | `ArrangeGrid(Container parent)` This method is obsolete and supplied for backwards compatability only; new code should call `arrangeGrid` instead.
`GridBagConstraints` | `getConstraints(Component comp)` Gets the constraints for the specified component.
`float` | `getLayoutAlignmentX(Container parent)` Returns the alignment along the x axis.
`float` | `getLayoutAlignmentY(Container parent)` Returns the alignment along the y axis.
`int[][]` | `getLayoutDimensions()` Determines column widths and row heights for the layout grid.
`protected java.awt.GridBagLayoutInfo` | `getLayoutInfo(Container parent, int sizeflag)` Fills in an instance of `GridBagLayoutInfo` for the current set of managed children.
`protected java.awt.GridBagLayoutInfo` | `GetLayoutInfo(Container parent, int sizeflag)` This method is obsolete and supplied for backwards compatability only; new code should call getLayoutInfo() instead.
`Point` | `getLayoutOrigin()` Determines the origin of the layout area, in the graphics coordinate space of the target container.
`double[][]` | `getLayoutWeights()` Determines the weights of the layout grid's columns and rows.
`protected Dimension` | `getMinSize(Container parent, java.awt.GridBagLayoutInfo info)` Figures out the minimum size of the master based on the information from getLayoutInfo().
`protected Dimension` | `GetMinSize(Container parent, java.awt.GridBagLayoutInfo info)` This method is obsolete and supplied for backwards compatability only; new code should call `getMinSize` instead.
`void` | `invalidateLayout(Container target)` Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
`void` | `layoutContainer(Container parent)` Lays out the specified container using this grid bag layout.
`Point` | `location(int x, int y)` Determines which cell in the layout grid contains the point specified by `(x, y)`.
`protected GridBagConstraints` | `lookupConstraints(Component comp)` Retrieves the constraints for the specified component.
`Dimension` | `maximumLayoutSize(Container target)` Returns the maximum dimensions for this layout given the components in the specified target container.
`Dimension` | `minimumLayoutSize(Container parent)` Determines the minimum size of the `parent` container using this grid bag layout.
`Dimension` | `preferredLayoutSize(Container parent)` Determines the preferred size of the `parent` container using this grid bag layout.
`void` | `removeLayoutComponent(Component comp)` Removes the specified component from this layout.
`void` | `setConstraints(Component comp, GridBagConstraints constraints)` Sets the constraints for the specified component in this layout.
`String` | `toString()` Returns a string representation of this grid bag layout's values.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### MAXGRIDSIZE

    protected static final int MAXGRIDSIZE

  The maximum number of grid positions (both horizontally and vertically) that can be laid out by the grid bag layout.

  See Also:
    Constant Field Values

### MINSIZE

    protected static final int MINSIZE

  The smallest grid that can be laid out by the grid bag layout.

  See Also:
    Constant Field Values

### PREFERREDSIZE

    protected static final int PREFERREDSIZE

  The preferred grid size that can be laid out by the grid bag layout.

  See Also:
    Constant Field Values

### comptable

    protected Hashtable comptable

  This hashtable maintains the association between a component and its gridbag constraints. The Keys in `comptable` are the components and the values are the instances of `GridBagConstraints`.

  See Also:
    `GridBagConstraints`

### defaultConstraints

    protected GridBagConstraints defaultConstraints

  This field holds a gridbag constraints instance containing the default values, so if a component does not have gridbag constraints associated with it, then the component will be assigned a copy of the `defaultConstraints`.

  See Also:
    `getConstraints(Component)`, `setConstraints(Component, GridBagConstraints)`, `lookupConstraints(Component)`

### layoutInfo

    protected java.awt.GridBagLayoutInfo layoutInfo

  This field holds the layout information for the gridbag. The information in this field is based on the most recent validation of the gridbag. If `layoutInfo` is `null` this indicates that there are no components in the gridbag or if there are components, they have not yet been validated.

  See Also:
    `getLayoutInfo(Container, int)`

### columnWidths

    public int[] columnWidths

  This field holds the overrides to the column minimum width. If this field is non-`null` the values are applied to the gridbag after all of the minimum columns widths have been calculated. If columnWidths has more elements than the number of columns, columns are added to the gridbag to match the number of elements in columnWidth.

  See Also:
    `getLayoutDimensions()`

### rowHeights

    public int[] rowHeights

  This field holds the overrides to the row minimum heights. If this field is non-null the values are applied to the gridbag after all of the minimum row heights have been calculated. If `rowHeights` has more elements than the number of rows, rowa are added to the gridbag to match the number of elements in `rowHeights`.

  See Also:
    `getLayoutDimensions()`

### columnWeights

    public double[] columnWeights

  This field holds the overrides to the column weights. If this field is non-`null` the values are applied to the gridbag after all of the columns weights have been calculated. If `columnWeights[i]` > weight for column i, then column i is assigned the weight in `columnWeights[i]`. If `columnWeights` has more elements than the number of columns, the excess elements are ignored - they do not cause more columns to be created.

### rowWeights

    public double[] rowWeights

  This field holds the overrides to the row weights. If this field is non-null the values are applied to the gridbag after all of the rows weights have been calculated. If `rowWeights[i]` > weight for row i, then row i is assigned the weight in `rowWeights[i]`. If `rowWeights` has more elements than the number of rows, the excess elements are ignored - they do not cause more rows to be created.

Constructor Detail

### GridBagLayout

    public GridBagLayout()

  Creates a grid bag layout manager.

Method Detail

### setConstraints

    public void setConstraints(Component comp,
                               GridBagConstraints constraints)

  Sets the constraints for the specified component in this layout.

  Parameters:
    `comp` - the component to be modified
    `constraints` - the constraints to be applied

### getConstraints

    public GridBagConstraints getConstraints(Component comp)

  Gets the constraints for the specified component. A copy of the actual `GridBagConstraints` object is returned.

  Parameters:
    `comp` - the component to be queried
  Returns:
    the constraint for the specified component in this grid bag layout; a copy of the actual constraint object is returned

### lookupConstraints

    protected GridBagConstraints lookupConstraints(Component comp)

  Retrieves the constraints for the specified component. The return value is not a copy, but is the actual `GridBagConstraints` object used by the layout mechanism.

  Parameters:
    `comp` - the component to be queried
  Returns:
    the contraints for the specified component

### getLayoutOrigin

    public Point getLayoutOrigin()

  Determines the origin of the layout area, in the graphics coordinate space of the target container. This value represents the pixel coordinates of the top-left corner of the layout area regardless of the `ComponentOrientation` value of the container. This is distinct from the grid origin given by the cell coordinates (0,0). Most applications do not call this method directly.

  Returns:
    the graphics origin of the cell in the top-left corner of the layout grid
  Since:
    JDK1.1
  See Also:
    `ComponentOrientation`

### getLayoutDimensions

    public int[][] getLayoutDimensions()

  Determines column widths and row heights for the layout grid.

  Most applications do not call this method directly.

  Returns:
    an array of two arrays, containing the widths of the layout columns and the heights of the layout rows
  Since:
    JDK1.1

### getLayoutWeights

    public double[][] getLayoutWeights()

  Determines the weights of the layout grid's columns and rows. Weights are used to calculate how much a given column or row stretches beyond its preferred size, if the layout has extra room to fill.

  Most applications do not call this method directly.

  Returns:
    an array of two arrays, representing the horizontal weights of the layout columns and the vertical weights of the layout rows
  Since:
    JDK1.1

### location

    public Point location(int x,
                          int y)

  Determines which cell in the layout grid contains the point specified by `(x, y)`. Each cell is identified by its column index (ranging from 0 to the number of columns minus 1) and its row index (ranging from 0 to the number of rows minus 1).

  If the `(x, y)` point lies outside the grid, the following rules are used. The column index is returned as zero if `x` lies to the left of the layout for a left-to-right container or to the right of the layout for a right-to-left container. The column index is returned as the number of columns if `x` lies to the right of the layout in a left-to-right container or to the left in a right-to-left container. The row index is returned as zero if `y` lies above the layout, and as the number of rows if `y` lies below the layout. The orientation of a container is determined by its `ComponentOrientation` property.

  Parameters:
    `x` - the x coordinate of a point
    `y` - the y coordinate of a point
  Returns:
    an ordered pair of indexes that indicate which cell in the layout grid contains the point (x, y).
  Since:
    JDK1.1
  See Also:
    `ComponentOrientation`

### addLayoutComponent

    public void addLayoutComponent(String name,
                                   Component comp)

  Adds the specified component with the specified name to the layout.

  Specified by:
    `addLayoutComponent` in interface `LayoutManager`
  Parameters:
    `name` - the name of the component
    `comp` - the component to be added

### addLayoutComponent

    public void addLayoutComponent(Component comp,
                                   Object constraints)

  Adds the specified component to the layout, using the specified `constraints` object. Note that constraints are mutable and are, therefore, cloned when cached.

  Specified by:
    `addLayoutComponent` in interface `LayoutManager2`
  Parameters:
    `comp` - the component to be added
    `constraints` - an object that determines how the component is added to the layout
  Throws:
    `IllegalArgumentException` - if `constraints` is not a `GridBagConstraint`

### removeLayoutComponent

    public void removeLayoutComponent(Component comp)

  Removes the specified component from this layout.

  Most applications do not call this method directly.

  Specified by:
    `removeLayoutComponent` in interface `LayoutManager`
  Parameters:
    `comp` - the component to be removed.
  See Also:
    `Container.remove(java.awt.Component)`, `Container.removeAll()`

### preferredLayoutSize

    public Dimension preferredLayoutSize(Container parent)

  Determines the preferred size of the `parent` container using this grid bag layout.

  Most applications do not call this method directly.

  Specified by:
    `preferredLayoutSize` in interface `LayoutManager`
  Parameters:
    `parent` - the container in which to do the layout
  Returns:
    the preferred size of the `parent` container
  See Also:
    `Container.getPreferredSize()`

### minimumLayoutSize

    public Dimension minimumLayoutSize(Container parent)

  Determines the minimum size of the `parent` container using this grid bag layout.

  Most applications do not call this method directly.

  Specified by:
    `minimumLayoutSize` in interface `LayoutManager`
  Parameters:
    `parent` - the container in which to do the layout
  Returns:
    the minimum size of the `parent` container
  See Also:
    `Container.doLayout()`

### maximumLayoutSize

    public Dimension maximumLayoutSize(Container target)

  Returns the maximum dimensions for this layout given the components in the specified target container.

  Specified by:
    `maximumLayoutSize` in interface `LayoutManager2`
  Parameters:
    `target` - the container which needs to be laid out
  Returns:
    the maximum dimensions for this layout
  See Also:
    `Container`, `minimumLayoutSize(Container)`, `preferredLayoutSize(Container)`

### getLayoutAlignmentX

    public float getLayoutAlignmentX(Container parent)

  Returns the alignment along the x axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.

  Specified by:
    `getLayoutAlignmentX` in interface `LayoutManager2`
  Returns:
    the value `0.5f` to indicate centered

### getLayoutAlignmentY

    public float getLayoutAlignmentY(Container parent)

  Returns the alignment along the y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.

  Specified by:
    `getLayoutAlignmentY` in interface `LayoutManager2`
  Returns:
    the value `0.5f` to indicate centered

### invalidateLayout

    public void invalidateLayout(Container target)

  Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.

  Specified by:
    `invalidateLayout` in interface `LayoutManager2`

### layoutContainer

    public void layoutContainer(Container parent)

  Lays out the specified container using this grid bag layout. This method reshapes components in the specified container in order to satisfy the contraints of this `GridBagLayout` object.

  Most applications do not call this method directly.

  Specified by:
    `layoutContainer` in interface `LayoutManager`
  Parameters:
    `parent` - the container in which to do the layout
  See Also:
    `Container`, `Container.doLayout()`

### toString

    public String toString()

  Returns a string representation of this grid bag layout's values.

  Overrides:
    `toString` in class `Object`
  Returns:
    a string representation of this grid bag layout.

### getLayoutInfo

    protected java.awt.GridBagLayoutInfo getLayoutInfo(Container parent,
                                                       int sizeflag)

  Fills in an instance of `GridBagLayoutInfo` for the current set of managed children. This requires three passes through the set of children:
  1. Figure out the dimensions of the layout grid.
  2. Determine which cells the components occupy.
  3. Distribute the weights and min sizes amoung the rows/columns.
  This also caches the minsizes for all the children when they are first encountered (so subsequent loops don't need to ask again).

  Parameters:
    `parent` - the layout container
    `sizeflag` - either `PREFERREDSIZE` or `MINSIZE`
  Returns:
    the `GridBagLayoutInfo` for the set of children
  Since:
    1.4

### GetLayoutInfo

    protected java.awt.GridBagLayoutInfo GetLayoutInfo(Container parent,
                                                       int sizeflag)

  This method is obsolete and supplied for backwards compatability only; new code should call getLayoutInfo() instead.

  See Also:
    `getLayoutInfo`

### adjustForGravity

    protected void adjustForGravity(GridBagConstraints constraints,
                                    Rectangle r)

  Adjusts the x, y, width, and height fields to the correct values depending on the constraint geometry and pads.

  Parameters:
    `constraints` - the constraints to be applied
    `r` - the `Rectangle` to be adjusted
  Since:
    1.4

### AdjustForGravity

    protected void AdjustForGravity(GridBagConstraints constraints,
                                    Rectangle r)

  This method is obsolete and supplied for backwards compatability only; new code should call `adjustForGravity` instead.

  See Also:
    `adjustForGravity`

### getMinSize

    protected Dimension getMinSize(Container parent,
                                   java.awt.GridBagLayoutInfo info)

  Figures out the minimum size of the master based on the information from getLayoutInfo().

  Parameters:
    `parent` - the layout container
    `info` - the layout info for this parent
  Returns:
    a `Dimension` object containing the minimum size
  Since:
    1.4

### GetMinSize

    protected Dimension GetMinSize(Container parent,
                                   java.awt.GridBagLayoutInfo info)

  This method is obsolete and supplied for backwards compatability only; new code should call `getMinSize` instead.

  See Also:
    `getMinSize`

### arrangeGrid

    protected void arrangeGrid(Container parent)

  Lays out the grid.

  Parameters:
    `parent` - the layout container
  Since:
    1.4

### ArrangeGrid

    protected void ArrangeGrid(Container parent)

  This method is obsolete and supplied for backwards compatability only; new code should call `arrangeGrid` instead.

  See Also:
    `arrangeGrid`

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JavaTM 2 Platform
Std. Ed. v1.4.1_"07"

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