view src/samer/core_/util/VLayout.java @ 0:bf79fb79ee13

Initial Mercurial check in.

/*
 *	VLayout.java	
 *
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
 *	without even the implied warranty of MERCHANTABILITY or 
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.core.util;
import java.awt.*;

/**
	Things are layed out horizontally. Everyone gets to
	be their preferred size, except for the filler, which
	is stretched horizontally (but not vertically) to fill
	the space available. The whole thing is centered vertically.
 */

public class VLayout implements LayoutManager, java.io.Serializable
{
	private int		gap=4;
	private int		filler=1; // index of filler component
	private int		fillerHeight=10;

	public VLayout( int f, int g) { gap=g; filler=f; }
	public VLayout( int f) { gap=0; filler=f; }

	public void setGap(int a) { gap=a; }
	public int  getGap() { return gap; }
	public void setFiller(int f) { filler=f; }
	public int  getFiller() { return filler; }
	public void addLayoutComponent(String name, Component comp) {}
	public void removeLayoutComponent(Component comp) {}

	public Dimension preferredLayoutSize(Container parent)
	{
		Component[] c=parent.getComponents();
		Dimension	d1=new Dimension(0,0), d2;

		int	n=c.length;
		for (int i=0; i<n; i++) {
			d2 = c[i].getPreferredSize();
			d1.width += d2.width;
			d1.height = Math.max(d1.height,d2.height);
		}

		if (n>1) d1.width += (n-1)*gap;

		Insets		insets=parent.getInsets();
		d1.width  += insets.left + insets.right;
		d1.height += insets.top + insets.bottom;

		return d1;
	}

	public Dimension minimumLayoutSize(Container parent) 
	{
		Component[] c=parent.getComponents();
		Dimension	d1=new Dimension(0,0), d2;

		int	n=c.length;
		for (int i=0; i<n; i++) {
			d2 = c[i].getMinimumSize();
			d1.width += d2.width;
			d1.height = Math.max(d1.height,d2.height);
		}

		if (n>1) d1.width += (n-1)*gap;

		Insets		insets=parent.getInsets();
		d1.width  += insets.left + insets.right;
		d1.height += insets.top + insets.bottom;

		return d1;
	}

	public void layoutContainer(Container parent)
	{
		Component[] c=parent.getComponents();
		Insets		insets=parent.getInsets();
		int			xl, xr, y, havail, h;
		Dimension	p=parent.getSize(), d;

		havail = p.height - (insets.top+insets.bottom);

		int	n=c.length;

		// first layout components left of filler

		xl = insets.left;
		for (int i=0; i<filler && i<n; i++) {
			d = c[i].getPreferredSize();
			if (d.height>havail) { h=havail; y=insets.bottom; }
			else				 { h=d.height; y=(p.height-h)/2; }
			c[i].setBounds(xl,y,d.width,h);
			xl += d.width + gap;
		}
		// xl is now position of left hand edge of filler

		// next, layout components right of filler
		// x is now position of RIGHTHAND edge

		xr = p.width-insets.right; 
		for (int i=n-1; i>filler && i>=0; i--) {
			d = c[i].getPreferredSize();
			if (d.height>havail) { h=havail; y=insets.bottom; }
			else				 { h=d.height; y=(p.height-h)/2; }
			c[i].setBounds(xr-d.width,y,d.width,h);
			xr -= d.width + gap;
		}
		// xr is now position of right hand edge of filler

		// now we can position the filler component
		if (filler>=0 && filler<n) {
			d = c[filler].getPreferredSize();
			if (d.height>havail) { h=havail; y=insets.bottom; }
			else				 { h=d.height; y=(p.height-h)/2; }
			c[filler].setBounds(xl,y,xr-xl,h);
		}
	}
}