WindowsLayoutStyle.java

package org.jdesktop.layout;

import java.awt.Container;
import javax.swing.JComponent;
import javax.swing.SwingConstants;

import org.ripple.power.ui.graphics.LFont;

class WindowsLayoutStyle extends LayoutStyle {

	private int baseUnitX;

	private int baseUnitY;

	public int getPreferredGap(JComponent source, JComponent target, int type,
			int position, Container parent) {
		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;
			}
			type = RELATED;
		}
		if (type == UNRELATED) {
			return getCBRBPadding(source, target, position,
					dluToPixels(7, position));
		} else {
			boolean sourceLabel = (source.getUIClassID() == "LabelUI");
			boolean targetLabel = (target.getUIClassID() == "LabelUI");

			if (((sourceLabel && !targetLabel) || (targetLabel && !sourceLabel))
					&& (position == SwingConstants.EAST || position == SwingConstants.WEST)) {
				return getCBRBPadding(source, target, position,
						dluToPixels(3, position));
			}
			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() {
		LFont font = LFont.getDefaultFont();
		baseUnitX = font
				.stringWidth("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
		baseUnitX = (baseUnitX / 26 + 1) / 2;
		baseUnitY = font.getAscent() + font.getDescent() - 1;
	}
}