com.jgoodies.looks.common

Class ExtButtonAreaLayout

java.lang.Object

javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

com.jgoodies.looks.common.ExtButtonAreaLayout

All Implemented Interfaces:

java.awt.LayoutManager

public final class ExtButtonAreaLayout
extends javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

Unlike its superclass, this layout uses a minimum button width that complies with Mac and Windows UI style guides.

Version:

$Revision: 1.13 $

Field Summary

Fields inherited from class javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

centersChildren, padding, syncAllWidths

Constructor Summary

Constructors

Constructor and Description
ExtButtonAreaLayout(boolean syncAllWidths, int padding) Constructs an ExtButtonAreaLayout.

Method Summary

Modifier and Type	Method and Description
private static int	getMinimumButtonWidth() Computes and answers the minimum button width.
void	layoutContainer(java.awt.Container container)
java.awt.Dimension	minimumLayoutSize(java.awt.Container c)

Methods inherited from class javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

addLayoutComponent, getCentersChildren, getPadding, getSyncAllWidths, preferredLayoutSize, removeLayoutComponent, setCentersChildren, setPadding, setSyncAllWidths

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtButtonAreaLayout

public ExtButtonAreaLayout(boolean syncAllWidths,
                           int padding)

Constructs an ExtButtonAreaLayout.

Parameters:

syncAllWidths - true indicates that all buttons get the same size

padding - the padding between buttons

Method Detail

layoutContainer

public void layoutContainer(java.awt.Container container)

Specified by:

layoutContainer in interface java.awt.LayoutManager

Overrides:

layoutContainer in class javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

minimumLayoutSize

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

Specified by:

minimumLayoutSize in interface java.awt.LayoutManager

Overrides:

minimumLayoutSize in class javax.swing.plaf.basic.BasicOptionPaneUI.ButtonAreaLayout

getMinimumButtonWidth

private static int getMinimumButtonWidth()

Computes and answers the minimum button width. The MS UX guide recommends a minimum width of 50 Dialog units (DLU).

This current implementation assumes an 8pt Tahoma and honors resolutions of 96dpi and 120dpi. This leads to a good approximation of the 50dlu for the vast majority of today's target systems. And it sure is an improvement over the superclass' value of 0.

A better implementation would use a conversion from dlu to pixel for the given buttons (that may have different font render contexts if located in different graphics environments in a multi-screen context). The JGoodies Forms provides such a converter and offers a better button layout by means of the ButtonBarBuilder2 class.

Returns:

the minimum button width