samer@0: /*
samer@0:  *	VLayout.java	
samer@0:  *
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.core.util;
samer@0: import java.awt.*;
samer@0: 
samer@0: /**
samer@0: 	Things are layed out horizontally. Everyone gets to
samer@0: 	be their preferred size, except for the filler, which
samer@0: 	is stretched horizontally (but not vertically) to fill
samer@0: 	the space available. The whole thing is centered vertically.
samer@0:  */
samer@0: 
samer@0: public class VLayout implements LayoutManager, java.io.Serializable
samer@0: {
samer@0: 	private int		gap=4;
samer@0: 	private int		filler=1; // index of filler component
samer@0: 	private int		fillerHeight=10;
samer@0: 
samer@0: 	public VLayout( int f, int g) { gap=g; filler=f; }
samer@0: 	public VLayout( int f) { gap=0; filler=f; }
samer@0: 
samer@0: 	public void setGap(int a) { gap=a; }
samer@0: 	public int  getGap() { return gap; }
samer@0: 	public void setFiller(int f) { filler=f; }
samer@0: 	public int  getFiller() { return filler; }
samer@0: 	public void addLayoutComponent(String name, Component comp) {}
samer@0: 	public void removeLayoutComponent(Component comp) {}
samer@0: 
samer@0: 	public Dimension preferredLayoutSize(Container parent)
samer@0: 	{
samer@0: 		Component[] c=parent.getComponents();
samer@0: 		Dimension	d1=new Dimension(0,0), d2;
samer@0: 
samer@0: 		int	n=c.length;
samer@0: 		for (int i=0; i<n; i++) {
samer@0: 			d2 = c[i].getPreferredSize();
samer@0: 			d1.width += d2.width;
samer@0: 			d1.height = Math.max(d1.height,d2.height);
samer@0: 		}
samer@0: 
samer@0: 		if (n>1) d1.width += (n-1)*gap;
samer@0: 
samer@0: 		Insets		insets=parent.getInsets();
samer@0: 		d1.width  += insets.left + insets.right;
samer@0: 		d1.height += insets.top + insets.bottom;
samer@0: 
samer@0: 		return d1;
samer@0: 	}
samer@0: 
samer@0: 	public Dimension minimumLayoutSize(Container parent) 
samer@0: 	{
samer@0: 		Component[] c=parent.getComponents();
samer@0: 		Dimension	d1=new Dimension(0,0), d2;
samer@0: 
samer@0: 		int	n=c.length;
samer@0: 		for (int i=0; i<n; i++) {
samer@0: 			d2 = c[i].getMinimumSize();
samer@0: 			d1.width += d2.width;
samer@0: 			d1.height = Math.max(d1.height,d2.height);
samer@0: 		}
samer@0: 
samer@0: 		if (n>1) d1.width += (n-1)*gap;
samer@0: 
samer@0: 		Insets		insets=parent.getInsets();
samer@0: 		d1.width  += insets.left + insets.right;
samer@0: 		d1.height += insets.top + insets.bottom;
samer@0: 
samer@0: 		return d1;
samer@0: 	}
samer@0: 
samer@0: 	public void layoutContainer(Container parent)
samer@0: 	{
samer@0: 		Component[] c=parent.getComponents();
samer@0: 		Insets		insets=parent.getInsets();
samer@0: 		int			xl, xr, y, havail, h;
samer@0: 		Dimension	p=parent.getSize(), d;
samer@0: 
samer@0: 		havail = p.height - (insets.top+insets.bottom);
samer@0: 
samer@0: 		int	n=c.length;
samer@0: 
samer@0: 		// first layout components left of filler
samer@0: 
samer@0: 		xl = insets.left;
samer@0: 		for (int i=0; i<filler && i<n; i++) {
samer@0: 			d = c[i].getPreferredSize();
samer@0: 			if (d.height>havail) { h=havail; y=insets.bottom; }
samer@0: 			else				 { h=d.height; y=(p.height-h)/2; }
samer@0: 			c[i].setBounds(xl,y,d.width,h);
samer@0: 			xl += d.width + gap;
samer@0: 		}
samer@0: 		// xl is now position of left hand edge of filler
samer@0: 
samer@0: 		// next, layout components right of filler
samer@0: 		// x is now position of RIGHTHAND edge
samer@0: 
samer@0: 		xr = p.width-insets.right; 
samer@0: 		for (int i=n-1; i>filler && i>=0; i--) {
samer@0: 			d = c[i].getPreferredSize();
samer@0: 			if (d.height>havail) { h=havail; y=insets.bottom; }
samer@0: 			else				 { h=d.height; y=(p.height-h)/2; }
samer@0: 			c[i].setBounds(xr-d.width,y,d.width,h);
samer@0: 			xr -= d.width + gap;
samer@0: 		}
samer@0: 		// xr is now position of right hand edge of filler
samer@0: 
samer@0: 		// now we can position the filler component
samer@0: 		if (filler>=0 && filler<n) {
samer@0: 			d = c[filler].getPreferredSize();
samer@0: 			if (d.height>havail) { h=havail; y=insets.bottom; }
samer@0: 			else				 { h=d.height; y=(p.height-h)/2; }
samer@0: 			c[filler].setBounds(xl,y,xr-xl,h);
samer@0: 		}
samer@0: 	}
samer@0: }