Language Java Nosugar Custom World Code Worldlayout.java

// 
//  WorldLayout manager class
//  part of the set of documents known as Java no sugar.
//  Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk
//  placed into the public domain.
//
//
//  Layout managers can't rely upon minimumSize() to return anything 
//  sensible
//

import java.awt.*;
import java.util.*;
import WorldConstraints;

public class WorldLayout implements LayoutManager
{
    private Hashtable constraint_table;
    private Dimension original_size = null;
    
    //**************************************************************
    // Constructors
    //**************************************************************
    public WorldLayout(int width, int height)
    {
        this();
        original_size = new Dimension(width,height);
    }
    
    public WorldLayout()
    {
        constraint_table = new Hashtable();
    }

    //**************************************************************
    // constraints
    //**************************************************************
    protected WorldConstraints lookupConstraints(Component  comp)
    {
        return ( this.getConstraints(comp) );
    }
    
    public WorldConstraints getConstraints(Component  comp)
    {
        return ( (WorldConstraints) constraint_table.get(comp) );
    }
    
    public void setConstraints(Component  comp, WorldConstraints  constraints)
    {
        constraint_table.put(comp, constraints);
    }
    
    //**************************************************************
    // unwanted methods defined by LayoutManager interface
    //**************************************************************
    public void addLayoutComponent(String   name,Component  comp)
    {
    }
    
    //**************************************************************
    // methods defined by LayoutManager interface
    //**************************************************************
    public void layoutContainer(Container   target)
    {
        Component component;
        int n_components, index, new_width, new_height;
        WorldConstraints constraint;
        Dimension container_size, component_size, min_component_size;
        double x,y, x_ratio, y_ratio;
        boolean first_time = true;
        
        //------------- resize each component to the size of the container--------
        container_size = target.size();

        // ------- if the original size is known, a resize hapened so adjust ratios
        if (original_size != null)
        {
            x_ratio = (double)container_size.width / (double)original_size.width;
            y_ratio = (double)container_size.height / (double)original_size.height;
        }
        else
        {
            x_ratio = 1.0;
            y_ratio = 1.0;
        }
            
        //------------- resize each component to the size of the container--------
        n_components = target.countComponents();
        for (index =0; index < n_components; index ++)
        {
            //- - - - - -get component and constraint - - - - - - - - -
            component = target.getComponent(index);
            constraint = (WorldConstraints)this.getConstraints(component);
            if (constraint == null)
                constraint = new WorldConstraints();
                    
            //- - - - get component sizes- - - - - - - - - - - - - - - - - - 
            component_size = component.preferredSize();
            min_component_size = component.minimumSize();

            //- - - -resize, observing minimum component size - - - - - - 
            if ( constraint.resizeX )
            {
                if (constraint.override_width)
                    new_width = (int) Math.round( (double)container_size.width * constraint.width /100.0 );
                else
                    new_width = (int) Math.round( (double)component_size.width * x_ratio);
                
                component_size.width = Math.max(new_width,min_component_size.width); 
            }
            
            if ( constraint.resizeY )
            {
                if (constraint.override_height)
                    new_height = (int) Math.round( (double)container_size.height * constraint.height/100.0);
                else
                    new_height = (int) Math.round( (double)component_size.height * y_ratio);
                    
                component_size.height = Math.max(new_height,min_component_size.height); 
            }
            component.resize(component_size.width, component_size.height);
            
            //- - - - - -move proportional to container size- - - - - - -
            x = (double) container_size.width * constraint.x / 100.0;
            y = (double) container_size.height * constraint.y / 100.0;
            component.move( (int)Math.round(x), (int)Math.round(y) );
        }
        
        //------------remember original size for next time------------
        if (original_size == null)
        {
            original_size = container_size;
            first_time = false;
        }
    }
    
    public Dimension minimumLayoutSize(Container  target)
    {
        return (original_size);
    }
    
    public Dimension preferredLayoutSize(Container  target)
    {
        return (original_size);
    }
    
    public void removeLayoutComponent(Component  comp)
    {
        constraint_table.remove(comp);
    }
    
    public String toString()
    {
        return ( getClass().getName() + ": from Java no sugar") ;
    }
}

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