info.clearthought.layout
Class TableLayout

java.lang.Object

  info.clearthought.layout.TableLayout

All Implemented Interfaces:

TableLayoutConstants, java.awt.LayoutManager, java.awt.LayoutManager2, java.io.Serializable

public class TableLayout
extends java.lang.Object
implements java.awt.LayoutManager2, java.io.Serializable, TableLayoutConstants

TableLayout is a layout manager that is more powerful than GridBagLayout yet much easier to use.

Background

TableLayout is a layout manager that arranges components in rows and columns like a spreadsheet. TableLayout allows each row or column to be a different size. A row or column can be given an absolute size in pixels, a percentage of the available space, or it can grow and shrink to fill the remaining space after other rows and columns have been resized.

Using spreadsheet terminology, a cell is the intersection of a row and column. Cells have finite, non-negative sizes measured in pixels. The dimensions of a cell depend solely upon the dimensions of its row and column.

A component occupies a rectangular group of one or more cells. The component can be aligned within those cells using four vertical and six horizontal justifications. The vertical justifications are left, center, right, and full. The horizontal justifications are left, center, right, full, leading, and trailing. With full justification the component is stretched either vertically or horizontally to fit the cell or group of cells.

Justification

Leading and trailing justification are used to support languages that are read from right to left. See the java.awt.ComponentOrientation class for details and http://java.sun.com/products/jfc/tsc/articles/bidi for an introduction to component orientation and bidirectional text support. The leading justification will align the component along the leading edge of the container and the trailing justification will align the component along the trailing edge. There is no leading or trailing justification along the vertical axis since all modern languages are read from top to bottom and no bottom-to-top orientation is defined in java.awt.ComponentOrientation.

For components using the ComponentOrientation.LEFT_TO_RIGHT orientation, the leading edge is the left edge and the trailing edge is the right one. For components using the ComponentOrientation.RIGHT_TO_LEFT orientation, the opposite is true. For components that are using ComponentOrientation.UNKNOWN and for Java runtime environments that do not support component orientation, left-to-right orientation is assumed for backwards compatibility.

Gaps

Horizontal and vertical gaps can be placed between rows and columns in two ways. If uniformed gaps are desired, the setHGap and setVGap methods may be used. To vary the size of gaps, simply use empty rows and columns with absolute sizes. Similiarly, to make a border around a container that does not have insets, use empty rows and columns along the edges of the container.

Constraints

Using TableLayout is a simple two step process. First, create a grid for your container by specifying row and column sizes using either a TableLayout constructor or the insertRow and insertColumn methods. Second, add components to the cells formed by the rows and columns.

When adding a component to a container that uses TableLayout, you specify the component's constraints that state which cells the component will occupy and how the component will be aligned. The constraints can be specified into two ways. The TableLayoutConstraints class can be used to systematically specify the constraints. This is useful to dynamic code, bean builders, and rapid application development software.

For manual coding, a quicker and easier way to specify constraints is with a short string in the form "x1, y1, x2, y2, hAlign, vAlign" where (x1, y1) identifies the top left cell (column x1, row y1) for the component and (x2, y2) identfies the bottom right cell. x2 and y2 are optional. If they are not specified, the component will occupy only one cell, (x1, y1). hAlign and vAlign are also optional with default values of full justification. Alignments may be spelt fully as in "LEFT" or abbreviated as in "L". The text is not case sensitive, but it is recommended that uppercase is used for two reasons. First, these text values are in essence constants. Second, some fonts use the same glyphs for representing a lowercase L and the number one. Ex., "l" vs. "1". Even fonts that do not will often use similar glyphs so using uppercase avoids confusion.

Dynamically altering the layout

Rows and columns can be dynamically created, resized, and removed at any time, even if the container is visible. Components will be shifted appropriately as rows and columns are inserted or removed, just as cells are shifted in a spreadsheet.

Rows and columns can be made "hidden" or effectively invisible by setting their size to zero. They can be shown again by setting their size back to a non-zero value. This is very useful for toggle form elements without having to remove individual components.

Preferred sizes

Often it is desireable to make a row or column just large enough to ensure that all components contained partially or wholly in that row or column are their preferred size. To make this easy, there is a constant called PREFERRED that can be used to specify row or column sizes. There is another constant called MINIMUM that does a similar task using components' minimum sizes instead of their preferred sizes.

There is no corresponding MAXIMUM constant for several reasons. First, it is mathematically impossible to honor both the minimum and maximum sizes of more than one component when conflicts arise. For example, say components a and b are in the same row. If a's maximum height is less than b's minimum height, then one of these constraints must be violated. Since TableLayout is a complete, general Cartesian layout manager, it would be possible to specify conflicting constraints if a MAXIMUM constant existed.

Second, the ability to make a component grow up to a maximum size is primarily of interest to layout managers like SpringLayout that have to balance the sizes of components because the presence of one component affects the size of another. Other than the effect of preferred and minimum size rows/columns, which are essentially convenient ways of specifying absolute sizes, the existence and constraints of one component does not affect any other components when using TableLayout. This is accomplished because rows and columns are explicit in TableLayout.

Third, the ability to constrain a component to its maximum size is subsumed by the ability to constrain it to its preferred size, which is precisely what happens when a component is aligned using anything but full justification. In the case of full justification, the component's maximum size is by definition unbounded.

Example

 import java.awt.*;
 import javax.swing.*;
 import info.clearthought.layout.TableLayout;
 
 public class Preferred extends JFrame
 {
 
     public static void main (String args[])
     {
         new Preferred();
     }
 
     public Preferred ()
     {
         super("The Power of Preferred Sizes");
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         Container pane = getContentPane();
 
         // b - border
         // f - FILL
         // p - PREFERRED
         // vs - vertical space between labels and text fields
         // vg - vertical gap between form elements
         // hg - horizontal gap between form elements
 
         double b = 10;
         double f = TableLayout.FILL;
         double p = TableLayout.PREFERRED;
         double vs = 5;
         double vg = 10;
         double hg = 10;
 
         double size[][] =
             {{b, f, hg, p, hg, p, b},
              {b, p, vs, p, vg, p, vs, p, vg, p, vs, p, vg, p, b}};
 
         TableLayout layout = new TableLayout(size);
         pane.setLayout (layout);
 
         // Create all controls
         JLabel labelName    = new JLabel("Name");
         JLabel labelAddress = new JLabel("Address");
         JLabel labelCity    = new JLabel("City");
         JLabel labelState   = new JLabel("State");
         JLabel labelZip     = new JLabel("Zip");
 
         JTextField textfieldName    = new JTextField(10);
         JTextField textfieldAddress = new JTextField(20);
         JTextField textfieldCity    = new JTextField(10);
         JTextField textfieldState   = new JTextField(2);
         JTextField textfieldZip     = new JTextField(5);
 
         JButton buttonOk = new JButton("OK");
         JButton buttonCancel = new JButton("Cancel");
         JPanel panelButton = new JPanel();
         panelButton.add(buttonOk);
         panelButton.add(buttonCancel);
 
         // Add all controls
         pane.add(labelName,        "1,  1, 5, 1");
         pane.add(textfieldName,    "1,  3, 5, 3");
         pane.add(labelAddress,     "1,  5, 5, 5");
         pane.add(textfieldAddress, "1,  7, 5, 7");
         pane.add(labelCity,        "1,  9");
         pane.add(textfieldCity,    "1, 11");
         pane.add(labelState,       "3,  9");
         pane.add(textfieldState,   "3, 11");
         pane.add(labelZip,         "5,  9");
         pane.add(textfieldZip,     "5, 11");
         pane.add(panelButton,      "1, 13, 5, 13");
 
         pack();
         setResizable(false);
         show();
     }
 }
 

Version:

4.0 September 14, 2005

Author:

Daniel E. Barbalace

See Also:

Serialized Form

Nested Class Summary

static class

TableLayout.Entry

Field Summary

protected static int	C Indicates a column
protected static boolean	checkForComponentOrientationSupport Used to minimize reflection calls
protected int[][]	crOffset Offsets of crs in pixels.
protected int[][]	crSize Sizes of crs in pixels
protected double[][]	crSpec Sizes of crs expressed in absolute and relative terms
protected static double[][]	defaultSize Default row/column size
protected boolean	dirty Indicates whether or not the size of the cells are known for the last known size of the container.
protected int	hGap Horizontal gap between columns
protected java.util.LinkedList	list List of components and their sizes
protected static java.lang.reflect.Method	methodGetComponentOrientation Method used to get component orientation while preserving compatability with earlier versions of java.awt.Container.
protected int	oldHeight Previous known height of the container
protected int	oldWidth Previous known width of the container
protected static int	R Indicates a row
protected int	vGap Vertical gap between rows

Fields inherited from interface info.clearthought.layout.TableLayoutConstants

BOTTOM, CENTER, FILL, FULL, LEADING, LEFT, MINIMUM, PREFERRED, RIGHT, TOP, TRAILING

Constructor Summary

TableLayout()
Constructs an instance of TableLayout.

TableLayout(double[][] size)
Constructs an instance of TableLayout.

TableLayout(double[] col, double[] row)
Constructs an instance of TableLayout.

Method Summary

void	addLayoutComponent(java.awt.Component component, java.lang.Object constraint) Adds the specified component with the specified name to the layout.
void	addLayoutComponent(java.lang.String name, java.awt.Component component) Adds the specified component with the specified name to the layout.
protected int	assignAbsoluteSize(int z, int availableSize) Assigns absolute sizes.
protected void	assignFillSize(int z, int availableSize) Assigns FILL sizes.
protected int	assignPrefMinSize(int z, int availableSize, double typeOfSize) Assigned sizes to preferred and minimum size columns and rows.
protected int	assignRelativeSize(int z, int availableSize) Assigns relative sizes.
protected java.awt.Dimension	calculateLayoutSize(java.awt.Container container, double typeOfSize) Calculates the preferred or minimum size for the methods preferredLayoutSize and minimumLayoutSize.
protected int	calculateLayoutSize(java.awt.Container container, int z, double typeOfSize, TableLayout.Entry[] entryList, java.awt.Dimension[] prefMinSize) Calculates the preferred or minimum size for the method calculateLayoutSize(Container container, double typeOfSize).
protected void	calculateOffset(int z, java.awt.Insets inset) Calculates the offset of each cr.
protected void	calculateSize(java.awt.Container container) Calculates the sizes of the rows and columns based on the absolute and relative sizes specified in crSpec[R] and crSpec[C] and the size of the container.
protected int[]	calculateSizeAndOffset(TableLayout.Entry entry, int preferredSize, boolean isColumn) Calculates the vertical/horizontal offset and size of a component.
void	deleteColumn(int i) Deletes a column in this layout.
protected void	deleteCr(int z, int i) Deletes a cr for the methods deleteRow or deleteColumn.
void	deleteRow(int i) Deletes a row in this layout.
double[]	getColumn() Gets the sizes of columns in this layout.
double	getColumn(int i) Gets the width of a single column in this layout.
protected java.awt.ComponentOrientation	getComponentOrientation(java.awt.Container container) Gets the container's component orientation.
TableLayoutConstraints	getConstraints(java.awt.Component component) Gets the constraints of a given component.
int	getHGap() Gets the horizontal gap between colunns.
java.util.List	getInvalidEntry() Determines whether or not there are any components with invalid constraints.
float	getLayoutAlignmentX(java.awt.Container parent) Returns the alignment along the x axis.
float	getLayoutAlignmentY(java.awt.Container parent) Returns the alignment along the y axis.
int	getNumColumn() Gets the number of columns in this layout.
int	getNumRow() Gets the number of rows in this layout.
java.util.List	getOverlappingEntry() Gets a list of overlapping components and their constraints.
double[]	getRow() Gets the height of a single row in this layout.
double	getRow(int i) Gets the sizes of a row in this layout.
int	getVGap() Gets the vertical gap between rows.
protected void	init(double[] col, double[] row) Initializes the TableLayout for all constructors.
void	insertColumn(int i, double size) Inserts a column in this layout.
void	insertCr(int z, int i, double size) Inserts a cr for the methods insertRow or insertColumn.
void	insertRow(int i, double size) Inserts a row in this layout.
void	invalidateLayout(java.awt.Container target) Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
void	layoutContainer(java.awt.Container container) To lay out the specified container using this layout.
java.awt.Dimension	maximumLayoutSize(java.awt.Container target) Returns the maximum dimensions for this layout given the components in the specified target container.
java.awt.Dimension	minimumLayoutSize(java.awt.Container container) Determines the minimum size of the container argument using this layout.
java.awt.Dimension	preferredLayoutSize(java.awt.Container container) Determines the preferred size of the container argument using this layout.
void	removeLayoutComponent(java.awt.Component component) Removes the specified component from the layout.
void	setColumn(double[] column) Adjusts the number and sizes of rows in this layout.
void	setColumn(int i, double size) Adjusts the width of a single column in this layout.
void	setConstraints(java.awt.Component component, TableLayoutConstraints constraint) Sets the constraints of a given component.
protected void	setCr(int z, double[] size) Sets the sizes of rows or columns for the methods setRow or setColumn.
protected void	setCr(int z, int i, double size) Sets the sizes of rows or columns for the methods setRow or setColumn.
void	setHGap(int hGap) Sets the horizontal gap between colunns.
void	setRow(double[] row) Adjusts the number and sizes of rows in this layout.
void	setRow(int i, double size) Adjusts the height of a single row in this layout.
void	setVGap(int vGap) Sets the vertical gap between rows.
java.lang.String	toString() Converts this TableLayout to a string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

defaultSize

protected static final double[][] defaultSize

Default row/column size

C

protected static final int C

Indicates a column

See Also:

Constant Field Values

R

protected static final int R

Indicates a row

See Also:

Constant Field Values

checkForComponentOrientationSupport

protected static boolean checkForComponentOrientationSupport

Used to minimize reflection calls

methodGetComponentOrientation

protected static java.lang.reflect.Method methodGetComponentOrientation

Method used to get component orientation while preserving compatability with earlier versions of java.awt.Container. Necessary for supporting older JDKs and MicroEdition versions of Java.

crSpec

protected double[][] crSpec

Sizes of crs expressed in absolute and relative terms

crSize

protected int[][] crSize

Sizes of crs in pixels

crOffset

protected int[][] crOffset

Offsets of crs in pixels. The left boarder of column n is at crOffset[C][n] and the right boarder is at cr[C][n + 1] for all columns including the last one. crOffset[C].length = crSize[C].length + 1

list

protected java.util.LinkedList list

List of components and their sizes

dirty

protected boolean dirty

Indicates whether or not the size of the cells are known for the last known size of the container. If dirty is true or the container has been resized, the cell sizes must be recalculated using calculateSize.

oldWidth

protected int oldWidth

Previous known width of the container

oldHeight

protected int oldHeight

Previous known height of the container

hGap

protected int hGap

Horizontal gap between columns

vGap

protected int vGap

Vertical gap between rows

Constructor Detail

TableLayout

public TableLayout()

Constructs an instance of TableLayout. This TableLayout will have no columns or rows. This constructor is most useful for bean-oriented programming and dynamically adding columns and rows.

TableLayout

public TableLayout(double[][] size)

Constructs an instance of TableLayout.

Parameters:

size - widths of columns and heights of rows in the format, {{col0, col1, col2, ..., colN}, {row0, row1, row2, ..., rowM}} If this parameter is invalid, the TableLayout will have exactly one row and one column.

TableLayout

public TableLayout(double[] col,

                   double[] row)

Constructs an instance of TableLayout.

Parameters:

col - widths of columns in the format, {{col0, col1, col2, ..., colN}

row - heights of rows in the format, {{row0, row1, row2, ..., rowN}

Method Detail

init

protected void init(double[] col,

                    double[] row)

Initializes the TableLayout for all constructors.

Parameters:

col - widths of columns in the format, {{col0, col1, col2, ..., colN}

row - heights of rows in the format, {{row0, row1, row2, ..., rowN}

getConstraints

public TableLayoutConstraints getConstraints(java.awt.Component component)

Gets the constraints of a given component.

Parameters:

component - desired component

Returns:

If the given component is found, the constraints associated with that component. If the given component is null or is not found, null is returned.

setConstraints

public void setConstraints(java.awt.Component component,

                           TableLayoutConstraints constraint)

Sets the constraints of a given component.

Parameters:

component - desired component. This parameter cannot be null.

constraint - new set of constraints. This parameter cannot be null.

setColumn

public void setColumn(double[] column)

Adjusts the number and sizes of rows in this layout. After calling this method, the caller should request this layout manager to perform the layout. This can be done with the following code:

     layout.layoutContainer(container);
     container.repaint();
 

or

     window.pack()
 

If this is not done, the changes in the layout will not be seen until the container is resized.

Parameters:

column - widths of each of the columns

See Also:

getColumn()

setRow

public void setRow(double[] row)

Adjusts the number and sizes of rows in this layout. After calling this method, the caller should request this layout manager to perform the layout. This can be done with the following code: layout.layoutContainer(container); container.repaint(); or

     window.pack()
 

If this is not done, the changes in the layout will not be seen until the container is resized.

Parameters:

row - heights of each of the rows. This parameter cannot be null.

See Also:

getRow()

setCr

protected void setCr(int z,

                     double[] size)

Sets the sizes of rows or columns for the methods setRow or setColumn.

Parameters:

z - indicates row or column

size - new cr size

setColumn

public void setColumn(int i,

                      double size)

Adjusts the width of a single column in this layout. After calling this method, the caller should request this layout manager to perform the layout. This can be done with the following code: layout.layoutContainer(container); container.repaint(); or

     window.pack()
 

If this is not done, the changes in the layout will not be seen until the container is resized.

Parameters:

i - zero-based index of column to set. If this parameter is not valid, an ArrayOutOfBoundsException will be thrown.

size - width of the column. This parameter cannot be null.

See Also:

getColumn()

setRow

public void setRow(int i,

                   double size)

Adjusts the height of a single row in this layout. After calling this method, the caller should request this layout manager to perform the layout. This can be done with the following code: layout.layoutContainer(container); container.repaint(); or

     window.pack()
 

If this is not done, the changes in the layout will not be seen until the container is resized.

Parameters:

i - zero-based index of row to set. If this parameter is not valid, an ArrayOutOfBoundsException will be thrown.

size - height of the row. This parameter cannot be null.

See Also:

getRow()

setCr

protected void setCr(int z,

                     int i,

                     double size)

Sets the sizes of rows or columns for the methods setRow or setColumn.

Parameters:

z - indicates row or column

i - indicates which cr to resize

size - new cr size

getColumn

public double[] getColumn()

Gets the sizes of columns in this layout.

Returns:

widths of each of the columns

See Also:

setColumn(double[])

getRow

public double[] getRow()

Gets the height of a single row in this layout.

Returns:

height of the requested row

See Also:

setRow(double[])

getColumn

public double getColumn(int i)

Gets the width of a single column in this layout.

Parameters:

i - zero-based index of row to get. If this parameter is not valid, an ArrayOutOfBoundsException will be thrown.

Returns:

width of the requested column

See Also:

setRow(double[])

getRow

public double getRow(int i)

Gets the sizes of a row in this layout.

Parameters:

i - zero-based index of row to get. If this parameter is not valid, an ArrayOutOfBoundsException will be thrown.

Returns:

height of each of the requested row

See Also:

setRow(double[])

getNumColumn

public int getNumColumn()

Gets the number of columns in this layout.

Returns:

the number of columns

getNumRow

public int getNumRow()

Gets the number of rows in this layout.

Returns:

the number of rows

getHGap

public int getHGap()

Gets the horizontal gap between colunns.

Returns:

the horizontal gap in pixels

getVGap

public int getVGap()

Gets the vertical gap between rows.

Returns:

the vertical gap in pixels

setHGap

public void setHGap(int hGap)

Sets the horizontal gap between colunns.

Parameters:

hGap - the horizontal gap in pixels

setVGap

public void setVGap(int vGap)

Sets the vertical gap between rows.

Parameters:

vGap - the horizontal gap in pixels

insertColumn

public void insertColumn(int i,

                         double size)

Inserts a column in this layout. All components to the right of the insertion point are moved right one column. The container will need to be laid out after this method returns. See setColumn.

Parameters:

i - zero-based index at which to insert the column

size - size of the column to be inserted

See Also:

setColumn(double[]), deleteColumn(int)

insertRow

public void insertRow(int i,

                      double size)

Inserts a row in this layout. All components below the insertion point are moved down one row. The container will need to be laid out after this method returns. See setRow.

Parameters:

i - zero-based index at which to insert the row

size - size of the row to be inserted

See Also:

setRow(double[]), deleteRow(int)

insertCr

public void insertCr(int z,

                     int i,

                     double size)

Inserts a cr for the methods insertRow or insertColumn.

Parameters:

z - indicates row or column

i - zero-based index at which to insert the cr

size - size of cr being inserted

deleteColumn

public void deleteColumn(int i)

Deletes a column in this layout. All components to the right of the deletion point are moved left one column. The container will need to be laid out after this method returns. See setColumn.

Parameters:

i - zero-based index of column to delete

See Also:

setColumn(double[]), deleteColumn(int)

deleteRow

public void deleteRow(int i)

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 setRow. There must be at least two rows in order to delete a row.

Parameters:

i - zero-based index of row to delete

See Also:

setRow(double[]), deleteRow(int)

deleteCr

protected void deleteCr(int z,

                        int i)

Deletes a cr for the methods deleteRow or deleteColumn.

Parameters:

z - indicates row or column

i - zero-based index of cr to delete

toString

public java.lang.String toString()

Converts this TableLayout to a string.

Overrides:

toString in class java.lang.Object

Returns:

a string representing the columns and row sizes in the form "{{col0, col1, col2, ..., colN}, {row0, row1, row2, ..., rowM}}"

getInvalidEntry

public java.util.List getInvalidEntry()

Determines whether or not there are any components with invalid constraints. An invalid constraint is one that references a non-existing 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. This method is useful for debugging.

Returns:

a list of TableLayout.Entry instances refering to the invalid constraints and corresponding components

See Also:

getOverlappingEntry()

getOverlappingEntry

public java.util.List getOverlappingEntry()

Gets a list of overlapping components and their constraints. Two components overlap if they cover at least one common cell. This method is useful for debugging.

Returns:

a list of zero or more TableLayout.Entry instances

See Also:

getInvalidEntry()

calculateSize

protected void calculateSize(java.awt.Container container)

Calculates the sizes of the rows and columns based on the absolute and relative sizes specified in crSpec[R] and crSpec[C] and the size of the container. The result is stored in crSize[R] and crSize[C].

Parameters:

container - container using this TableLayout

assignAbsoluteSize

protected int assignAbsoluteSize(int z,

                                 int availableSize)

Assigns absolute sizes.

Parameters:

z - indicates row or column

availableSize - amount of space available in the container

Returns:

the amount of space available after absolute crs have been assigned sizes

assignRelativeSize

protected int assignRelativeSize(int z,

                                 int availableSize)

Assigns relative sizes.

Parameters:

z - indicates row or column

availableSize - amount of space available in the container

Returns:

the amount of space available after relative crs have been assigned sizes

assignFillSize

protected void assignFillSize(int z,

                              int availableSize)

Assigns FILL sizes.

Parameters:

z - indicates row or column

availableSize - amount of space available in the container

calculateOffset

protected void calculateOffset(int z,

                               java.awt.Insets inset)

Calculates the offset of each cr.

Parameters:

z - indicates row or column

assignPrefMinSize

protected int assignPrefMinSize(int z,

                                int availableSize,

                                double typeOfSize)

Assigned sizes to preferred and minimum size columns and rows. This reduces the available width and height. Minimum widths/heights must be calculated first because they affect preferred widths/heights, but not vice versa. The end result is that any component contained wholly or partly in a column/row of minimum/preferred width or height will get at least its minimum/preferred width or height, respectively.

Parameters:

z - indicates row or column

availableSize - amount of space available in the container

typeOfSize - indicates preferred or minimum

Returns:

the amount of space available after absolute crs have been assigned sizes

layoutContainer

public void layoutContainer(java.awt.Container container)

To lay out the specified container using this layout. This method reshapes the components in the specified target container in order to satisfy the constraints of all components.

User code should not have to call this method directly.

Specified by:

layoutContainer in interface java.awt.LayoutManager

Parameters:

container - container being served by this layout manager

getComponentOrientation

protected java.awt.ComponentOrientation getComponentOrientation(java.awt.Container container)

Gets the container's component orientation. If a JDK that does not support component orientation is being used, then null is returned.

Parameters:

container - Container whose orientation is being queried

Returns:

the container's orientation or null if no orientation is supported

calculateSizeAndOffset

protected int[] calculateSizeAndOffset(TableLayout.Entry entry,

                                       int preferredSize,

                                       boolean isColumn)

Calculates the vertical/horizontal offset and size of a component.

Parameters:

entry - entry containing component and contraints

preferredSize - previously calculated preferred width/height of component

isColumn - if true, this method is being called to calculate the offset/size of a column. if false,... of a row.

Returns:

an array, a, of two integers such that a[0] is the offset and a[1] is the size

preferredLayoutSize

public java.awt.Dimension preferredLayoutSize(java.awt.Container container)

Determines the preferred size of the container argument using this layout. The preferred size is the smallest size that, if used for the container's size, will ensure that all components are at least as large as their preferred size. This method cannot guarantee that all components will be their preferred size. For example, if component A and component B are each allocate half of the container's width and component A wants to be 10 pixels wide while component B wants to be 100 pixels wide, they cannot both be accommodated. Since in general components rather be larger than their preferred size instead of smaller, component B's request will be fulfilled. The preferred size of the container would be 200 pixels.

Specified by:

preferredLayoutSize in interface java.awt.LayoutManager

Parameters:

container - container being served by this layout manager

Returns:

a dimension indicating the container's preferred size

minimumLayoutSize

public java.awt.Dimension minimumLayoutSize(java.awt.Container container)

Determines the minimum size of the container argument using this layout. The minimum size is the smallest size that, if used for the container's size, will ensure that all components are at least as large as their minimum size. This method cannot guarantee that all components will be their minimum size. For example, if component A and component B are each allocate half of the container's width and component A wants to be 10 pixels wide while component B wants to be 100 pixels wide, they cannot both be accommodated. Since in general components rather be larger than their minimum size instead of smaller, component B's request will be fulfilled. The minimum size of the container would be 200 pixels.

Specified by:

minimumLayoutSize in interface java.awt.LayoutManager

Parameters:

container - container being served by this layout manager

Returns:

a dimension indicating the container's minimum size

calculateLayoutSize

protected java.awt.Dimension calculateLayoutSize(java.awt.Container container,

                                                 double typeOfSize)

Calculates the preferred or minimum size for the methods preferredLayoutSize and minimumLayoutSize.

Parameters:

container - container whose size is being calculated

typeOfSize - indicates preferred or minimum

Returns:

a dimension indicating the container's preferred or minimum size

calculateLayoutSize

protected int calculateLayoutSize(java.awt.Container container,

                                  int z,

                                  double typeOfSize,

                                  TableLayout.Entry[] entryList,

                                  java.awt.Dimension[] prefMinSize)

Calculates the preferred or minimum size for the method calculateLayoutSize(Container container, double typeOfSize). This method is passed the preferred/minimum sizes of the components so that the potentially expensive methods getPreferredSize()/getMinimumSize() are not called twice for the same component.

Parameters:

container - container whose size is being calculated

z - indicates row or column

typeOfSize - indicates preferred or minimum

entryList - list of Entry objects

prefMinSize - list of preferred or minimum sizes

Returns:

a dimension indicating the container's preferred or minimum size

addLayoutComponent

public void addLayoutComponent(java.lang.String name,

                               java.awt.Component component)

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

Specified by:

addLayoutComponent in interface java.awt.LayoutManager

Parameters:

name - indicates entry's position and anchor

component - component to add

addLayoutComponent

public void addLayoutComponent(java.awt.Component component,

                               java.lang.Object constraint)

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

Specified by:

addLayoutComponent in interface java.awt.LayoutManager2

Parameters:

component - component to add

constraint - indicates entry's position and alignment

removeLayoutComponent

public void removeLayoutComponent(java.awt.Component component)

Removes the specified component from the layout.

Specified by:

removeLayoutComponent in interface java.awt.LayoutManager

Parameters:

component - component being removed

maximumLayoutSize

public java.awt.Dimension maximumLayoutSize(java.awt.Container target)

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

Specified by:

maximumLayoutSize in interface java.awt.LayoutManager2

Parameters:

target - the component which needs to be laid out

Returns:

unconditionally, a Dimension of Integer.MAX_VALUE by Integer.MAX_VALUE since TableLayout does not limit the maximum size of a container

getLayoutAlignmentX

public float getLayoutAlignmentX(java.awt.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 java.awt.LayoutManager2

Returns:

unconditionally, 0.5

getLayoutAlignmentY

public float getLayoutAlignmentY(java.awt.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 java.awt.LayoutManager2

Returns:

unconditionally, 0.5

invalidateLayout

public void invalidateLayout(java.awt.Container target)

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

Specified by:

invalidateLayout in interface java.awt.LayoutManager2