jwo.utils.gui
Class SGLayout

java.lang.Object
  jwo.utils.gui.SGLayout

All Implemented Interfaces:

LayoutManager, Serializable

Direct Known Subclasses:

PointLayout, SCLayout, SRLayout

public class SGLayout

extends Object

implements LayoutManager, Serializable

Creates simple scalded grid layout with multiple columns and rows. See JavaWorld Tips, 129.

Version:

2.1, 9th August, 2002

Author:

John Redmond, modified by Jo Wood

See Also:

Serialized Form

Field Summary

static int	BOTTOM Indicates bottom alignment of a cell.
protected int	bottomBorder
static int	CENTER Indicates centred alignment of a cell.
protected int	cols
protected double[]	columnScale
protected int[]	columnSizes
static int	FILL Indicates cell should fill available space.
protected int	hAlignment
protected int[][]	hAlignments
protected int	hgap
static int	LEFT Indicates left alignment of a cell.
protected int	leftBorder
protected int	minH
protected int	minW
static int	RIGHT Indicates right alignment of a cell.
protected int	rightBorder
protected int	rows
protected double[]	rowScale
protected int[]	rowSizes
static int	TOP Indicates top alignment of a cell.
protected int	topBorder
protected int	vAlignment
protected int[][]	vAlignments
protected int	vgap

Constructor Summary

SGLayout()
Creates a default (2 x 2) layout.

SGLayout(int rows, int cols)
Creates a layout with the specified number of rows and columns.

SGLayout(int rows, int cols, int hgap, int vgap)
Creates a layout with the specified number of rows and columns and specified gaps.

SGLayout(int rows, int cols, int hAlignment, int vAlignment, int hgap, int vgap)
Creates a layout with the specified number of rows and columns, specified gaps and aligment properties.

Method Summary

void	addLayoutComponent(String name, Component comp) Adds a component to the layout, but does nothing in this case.
protected void	allocateMaxSizes(Container parent) Update the maximum sizes for each of the grid cells using the specified scale values for rows and columns.
void	layoutContainer(Container parent) Lays out the specified container using this layout within the calculated grids.
Dimension	minimumLayoutSize(Container parent) Determines the minimum size of the container argument using this grid layout.
Dimension	preferredLayoutSize(Container parent) Determines the preferred size of the container argument using this grid layout.
void	removeLayoutComponent(Component comp) Adds a component to the layout, but does nothing in this case.
void	setAlignment(int row, int col, int hAlignment, int vAlignment) Set up alignment for a specific cell.
void	setColumnAlignment(int col, int hAlignment, int vAlignment) Set up alignment for a specific column.
void	setColumnScale(int index, double prop) Sets up scale value for a specific column.
void	setMargins(int topBorder, int leftBorder, int bottomBorder, int rightBorder) Sets up the margins for the whole layout.
void	setRowAlignment(int row, int hAlignment, int vAlignment) Set up alignment for a specific row.
void	setRowScale(int index, double prop) Sets up scale value for a specific row.

Methods inherited from class java.lang.Object

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

Field Detail

LEFT

public static final int LEFT

Indicates left alignment of a cell.

See Also:

Constant Field Values

CENTER

public static final int CENTER

Indicates centred alignment of a cell.

See Also:

Constant Field Values

RIGHT

public static final int RIGHT

Indicates right alignment of a cell.

See Also:

Constant Field Values

FILL

public static final int FILL

Indicates cell should fill available space.

See Also:

Constant Field Values

TOP

public static final int TOP

Indicates top alignment of a cell.

See Also:

Constant Field Values

BOTTOM

public static final int BOTTOM

Indicates bottom alignment of a cell.

See Also:

Constant Field Values

rows

protected int rows

cols

protected int cols

vgap

protected int vgap

hgap

protected int hgap

topBorder

protected int topBorder

leftBorder

protected int leftBorder

bottomBorder

protected int bottomBorder

rightBorder

protected int rightBorder

minW

protected int minW

minH

protected int minH

rowScale

protected double[] rowScale

columnScale

protected double[] columnScale

hAlignment

protected int hAlignment

vAlignment

protected int vAlignment

hAlignments

protected int[][] hAlignments

vAlignments

protected int[][] vAlignments

rowSizes

protected int[] rowSizes

columnSizes

protected int[] columnSizes

Constructor Detail

SGLayout

public SGLayout()

Creates a default (2 x 2) layout. Horizontal and vertical gaps are set to 0 and X- and Y-alignments are set to FILL.

SGLayout

public SGLayout(int rows,
                int cols)

Creates a layout with the specified number of rows and columns. Horizontal and vertical gaps are set to 0 and X- and Y-alignments are set to FILL.

Parameters:

rows - Number of rows.

cols - Number of columns.

SGLayout

public SGLayout(int rows,
                int cols,
                int hgap,
                int vgap)

Creates a layout with the specified number of rows and columns and specified gaps. X- and Y-alignments are set to FILL.

Parameters:

rows - Number of rows.

cols - Number of columns.

hgap - The horizontal gap, in pixels.

vgap - The vertical gap, in pixels.

SGLayout

public SGLayout(int rows,
                int cols,
                int hAlignment,
                int vAlignment,
                int hgap,
                int vgap)

Creates a layout with the specified number of rows and columns, specified gaps and aligment properties.

Parameters:

rows - Number of rows.

cols - Number of columns.

hAlignment - The X-alignment (LEFT, RIGHT, CENTER or FILL).

vAlignment - the Y-alignment (TOP, BOTTOM, CENTER or FILL).

hgap - The horizontal gap, in pixels.

vgap - The vertical gap, in pixels.

Method Detail

setMargins

public void setMargins(int topBorder,
                       int leftBorder,
                       int bottomBorder,
                       int rightBorder)

Sets up the margins for the whole layout.

Parameters:

topBorder - The top border (in pixels).

leftBorder - The left border (in pixels).

bottomBorder - The bottom border (in pixels).

rightBorder - The right border (in pixels).

setRowScale

public void setRowScale(int index,
                        double prop)

Sets up scale value for a specific row.

Parameters:

index - The row number to scale.

prop - The scale value for the row.

setColumnScale

public void setColumnScale(int index,
                           double prop)

Sets up scale value for a specific column.

Parameters:

index - The column number to scale.

prop - The scale value for the column.

setAlignment

public void setAlignment(int row,
                         int col,
                         int hAlignment,
                         int vAlignment)

Set up alignment for a specific cell.

Parameters:

row - The row value of the cell to align.

col - The column value of the cell to align.

hAlignment - The X-alignment (LEFT, RIGHT, CENTER or FILL).

vAlignment - the Y-alignment (TOP, BOTTOM, CENTER or FILL).

setRowAlignment

public void setRowAlignment(int row,
                            int hAlignment,
                            int vAlignment)

Set up alignment for a specific row.

Parameters:

row - The row to align.

hAlignment - The X-alignment (LEFT, RIGHT, CENTER or FILL).

vAlignment - the Y-alignment (TOP, BOTTOM, CENTER or FILL).

setColumnAlignment

public void setColumnAlignment(int col,
                               int hAlignment,
                               int vAlignment)

Set up alignment for a specific column.

Parameters:

col - The column to align.

hAlignment - The X-alignment (LEFT, RIGHT, CENTER or FILL).

vAlignment - the Y-alignment (TOP, BOTTOM, CENTER or FILL).

addLayoutComponent

public void addLayoutComponent(String name,
                               Component comp)

Adds a component to the layout, but does nothing in this case.

Specified by:

addLayoutComponent in interface LayoutManager

removeLayoutComponent

public void removeLayoutComponent(Component comp)

Adds a component to the layout, but does nothing in this case.

Specified by:

removeLayoutComponent in interface LayoutManager

preferredLayoutSize

public Dimension preferredLayoutSize(Container parent)

Determines the preferred size of the container argument using this grid layout. The preferred width is the width of the largest row of children, which is the largest sum of preferred widths. The preferred height is the sum of the the largest heights of the rows, which is the largest preferred height in each row.

Specified by:

preferredLayoutSize in interface LayoutManager

Parameters:

parent - The container in which to do the layout.

Returns:

The preferred dimensions to lay out the subcomponents of the specified container.

minimumLayoutSize

public Dimension minimumLayoutSize(Container parent)

Determines the minimum size of the container argument using this grid layout. The preferred width is the width of the largest row of children, which is the largest sum of minimum widths. The preferred height is the sum of the the largest heights of the rows, which is the largest minimum height in each row.

Specified by:

minimumLayoutSize in interface LayoutManager

Parameters:

parent - The container in which to do the layout.

Returns:

The preferred dimensions to lay out the subcomponents of the specified container.

layoutContainer

public void layoutContainer(Container parent)

Lays out the specified container using this layout within the calculated grids.

Specified by:

layoutContainer in interface LayoutManager

Parameters:

parent - the container to be laid out.

allocateMaxSizes

protected void allocateMaxSizes(Container parent)

Update the maximum sizes for each of the grid cells using the specified scale values for rows and columns.

Parameters:

parent - the container to be laid out.