stacklayout.java

This is Layout manager for java using swing.

/*
 * Copyright (C) Jerry Huxtable 1998
 */
package com.jhlabs.awt;

import java.awt.*;

public class StackLayout extends ConstraintLayout {

	private final static Integer DEFAULT = new Integer(Direction.CENTER);
	
	public StackLayout() {
	}

	public static Integer alignment(int fill, int alignment) {
		return new Integer(fill << 8 | alignment);
	}

	public void setConstraint(Component c, Object constraint) {
		if (constraint == null)
			constraint = DEFAULT;
		if (!(constraint instanceof Integer))
			throw new IllegalArgumentException("Constraint must be an Integer");
		super.setConstraint(c, constraint);
	}
	
	public void measureLayout(Container target, Dimension dimension, int type)  {
		int count = target.getComponentCount();
		if (dimension != null) {
			for (int i = 0 ; i < count ; i++) {
				Component m = target.getComponent(i);
				if (m.isVisible()) {
					Dimension d = getComponentSize(m, type);
					dimension.width = Math.max(d.width, dimension.width);
					dimension.height = Math.max(d.height, dimension.height);
				}
			}
		} else {
			Insets insets = target.getInsets();
			Dimension size = target.getSize();
			int w = size.width - (insets.left + insets.right);
			int h = size.height - (insets.top + insets.bottom);
			Rectangle cell = new Rectangle(insets.left, insets.top, w, h);

			for (int i = 0 ; i < count ; i++) {
				Component m = target.getComponent(i);
				int n = ((Integer)getConstraint(m)).intValue();
				int alignment = n & 0xff;
				int fill = (n >> 8) & 0xff;
				if (m.isVisible()) {
					Dimension d = getComponentSize(m, type);
					Rectangle r = new Rectangle(0, 0, d.width, d.height);
					Alignment.alignInCell(r, cell, alignment, fill);
					m.setBounds(r.x, r.y, r.width, r.height);
				}
			}
		}
	}

}