/*
* Copyright (C) 2005-2006 Sun Microsystems, Inc. All rights reserved. Use is
* subject to license terms.
*/
package org.jdesktop.layout;
import java.awt.Container;
import java.awt.FontMetrics;
import java.awt.Toolkit;
import javax.swing.JComponent;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
/**
* An implementation of <code>LayoutStyle</code> for the Windows look and feel.
* This information comes from:
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwue/html/ch14e.asp
*
* @version $Revision: 1.1 $
*/
class WindowsLayoutStyle extends LayoutStyle {
/**
* Base dialog units along the horizontal axis.
*/
private int baseUnitX;
/**
* Base dialog units along the vertical axis.
*/
private int baseUnitY;
public int getPreferredGap(JComponent source, JComponent target,
int type, int position, Container parent) {
// Invoke super to check arguments.
super.getPreferredGap(source, target, type, position, parent);
if (type == INDENT) {
if (position == SwingConstants.EAST || position == SwingConstants.WEST) {
int gap = getButtonChildIndent(source, position);
if (gap != 0) {
return gap;
}
return 10;
}
// Treat vertical INDENT as RELATED
type = RELATED;
}
if (type == UNRELATED) {
// Between unrelated controls: 7
return getCBRBPadding(source, target, position,
dluToPixels(7, position));
}
else { //type == RELATED
boolean sourceLabel = (source.getUIClassID() == "LabelUI");
boolean targetLabel = (target.getUIClassID() == "LabelUI");
if (((sourceLabel && !targetLabel) ||
(targetLabel && !sourceLabel)) &&
(position == SwingConstants.EAST ||
position == SwingConstants.WEST)) {
// Between text labels and their associated controls (for
// example, text boxes and list boxes): 3
// NOTE: We're not honoring:
// 'Text label beside a button 3 down from the top of
// the button,' but I suspect that is an attempt to
// enforce a baseline layout which will be handled
// separately. In order to enforce this we would need
// this API to return a more complicated type (Insets,
// or something else).
return getCBRBPadding(source, target, position,
dluToPixels(3, position));
}
// Between related controls: 4
return getCBRBPadding(source, target, position,
dluToPixels(4, position));
}
}
public int getContainerGap(JComponent component, int position,
Container parent) {
super.getContainerGap(component, position, parent);
return getCBRBPadding(component, position, dluToPixels(7, position));
}
private int dluToPixels(int dlu, int direction) {
if (baseUnitX == 0) {
calculateBaseUnits();
}
if (direction == SwingConstants.EAST ||
direction == SwingConstants.WEST) {
return dlu * baseUnitX / 4;
}
assert (direction == SwingConstants.NORTH ||
direction == SwingConstants.SOUTH);
return dlu * baseUnitY / 8;
}
private void calculateBaseUnits() {
// This calculation comes from:
// http://support.microsoft.com/default.aspx?scid=kb;EN-US;125681
FontMetrics metrics = Toolkit.getDefaultToolkit().getFontMetrics(
UIManager.getFont("Button.font"));
baseUnitX = metrics.stringWidth(
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
baseUnitX = (baseUnitX / 26 + 1) / 2;
// The -1 comes from experimentation.
baseUnitY = metrics.getAscent() + metrics.getDescent() - 1;
}
}