org.tn5250j.tools

Class ENHGridLayout

java.lang.Object

java.awt.GridLayout

org.tn5250j.tools.ENHGridLayout

All Implemented Interfaces:

LayoutManager, Serializable

Direct Known Subclasses:

AlignLayout

public class ENHGridLayout
extends GridLayout

ENHGridLayout is an improved subclass of GridLayout. It lays out a grid of rows and columns based on the attributes of the individual rows and columns. ENHGridLayout uses the widest element in a column to set the width of that column, and the tallest element in a row to set the height of that row.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	col_widths Array of column widths.
protected int	cols The number of columns in the layout, as set by the user.
protected int	hgap The horiztonal gap between items.
protected int[]	row_heights Array of row heights.
protected int	rows The number of rows in the layout, as set by the user.
static int	VARIABLE
protected int	vgap The vertical gap between items.

Constructor Summary

Constructors

Constructor and Description
ENHGridLayout(int rows, int cols) Creates a grid layout with the specified number of rows and columns.
ENHGridLayout(int rows, int cols, int hgap, int vgap) Creates a grid layout with the specified rows, columns, horizontal gap, and vertical gap.

Method Summary

Modifier and Type	Method and Description
protected void	getGridSizes(Container parent, boolean min) Traverses the children and determines row heights and column widths.
void	layoutContainer(Container parent) Performs the layout of the children.
Dimension	minimumLayoutSize(Container parent) Returns the minimum dimensions needed to layout the components contained in the specified panel.
Dimension	preferredLayoutSize(Container parent) Calculates the preferred size for this layout.
protected void	setBounds(int pos, int row, int col, Component comp, int x, int y, int w, int h)

Methods inherited from class java.awt.GridLayout

addLayoutComponent, getColumns, getHgap, getRows, getVgap, removeLayoutComponent, setColumns, setHgap, setRows, setVgap, toString

Methods inherited from class java.lang.Object

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

Field Detail

hgap

protected int hgap

The horiztonal gap between items.

vgap

protected int vgap

The vertical gap between items.

rows

protected int rows

The number of rows in the layout, as set by the user. This number may not correspond exactly to the number of rows in the layout.

cols

protected int cols

The number of columns in the layout, as set by the user. This number may not correspond exactly to the number of columns in the layout.

row_heights

protected int[] row_heights

Array of row heights. It is accurate only after a call to getGridSizes()

col_widths

protected int[] col_widths

Array of column widths. It is accurate only after a call to getGridSizes()

VARIABLE

public static final int VARIABLE

See Also:

Constant Field Values

Constructor Detail

ENHGridLayout

public ENHGridLayout(int rows,
                     int cols)

Creates a grid layout with the specified number of rows and columns.

Parameters:

rows - the number of rows in the layout

cols - the number of columns in the layout

ENHGridLayout

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

Creates a grid layout with the specified rows, columns, horizontal gap, and vertical gap.

Parameters:

rows - the rows; VARIABLE (0) means 'any number.'

cols - the columns; VARIABLE (0) means 'any number.' Only one of 'rows' and 'cols' can be VARIABLE, not both.

hgap - the horizontal gap variable

vgap - the vertical gap variable

Throws:

IllegalArgumentException - If the rows and columns are invalid.

Method Detail

getGridSizes

protected void getGridSizes(Container parent,
                            boolean min)

Traverses the children and determines row heights and column widths.

Parameters:

parent - the component which needs to be laid out

min - if true, the minimum size is used. Otherwise, the preferred size is used.

preferredLayoutSize

public Dimension preferredLayoutSize(Container parent)

Calculates the preferred size for this layout.

Specified by:

preferredLayoutSize in interface LayoutManager

Overrides:

preferredLayoutSize in class GridLayout

Parameters:

parent - the component which needs to be laid out

minimumLayoutSize

public Dimension minimumLayoutSize(Container parent)

Returns the minimum dimensions needed to layout the components contained in the specified panel.

Specified by:

minimumLayoutSize in interface LayoutManager

Overrides:

minimumLayoutSize in class GridLayout

Parameters:

parent - the component which needs to be laid out

setBounds

protected void setBounds(int pos,
                         int row,
                         int col,
                         Component comp,
                         int x,
                         int y,
                         int w,
                         int h)

layoutContainer

public void layoutContainer(Container parent)

Performs the layout of the children. It calculates the number of actual rows and columns based on the user's settings, retrieves row height and column width information, then moves all the children to the appropriate places.

Specified by:

layoutContainer in interface LayoutManager

Overrides:

layoutContainer in class GridLayout

Parameters:

parent - the specified component being laid out