//
// display different layouts.
//
// see main method for command-line arguments.
//
import java.awt.* ;
import java.awt.event.* ;

class Layouts {

        //
        // command-line arguments are one of the following:
        //      flow N (creates a frame using FlowLayout, containing
        //              N Buttons).
        //      grid N M (creates a frame using GridLayout, containing
        //              an N by M array of buttons).
        //      border (creates a frame using BorderLayout, containing
        //              5 buttons).
        //
        public static void main(String[] args) {

                String prompt = "Argument must be one of:\n" +
                        "\tflow N\n" + "\tgrid N M\n" + "\tborder" ;

                if (args.length < 1) {
                        System.out.println(prompt) ;
                        System.exit(-1) ;
                }

                final Frame f = new CloseableFrame("Layouts") ;

                String l = args[0] ;

                if (l.equals("flow")) {
                        if (args.length < 2) {
                                System.out.println(prompt) ;
                                System.exit(-1) ;
                        }
                        f.setLayout(new FlowLayout()) ;
                        int N = Integer.parseInt(args[1]) ;
                        for (int i = 0 ; i < N ; i++) 
                                f.add(new Button("button " + i)) ;
                }

                else if (l.equals("grid")) {
                        if (args.length < 3) {
                                System.out.println(prompt) ;
                                System.exit(-1) ;
                        }
                        int N = Integer.parseInt(args[1]) ;
                        int M = Integer.parseInt(args[2]) ;
                        f.setLayout(new GridLayout(N, M)) ;
                        for (int i = 0 ; i < N ; i++) 
                        for (int j = 0 ; j < M ; j++) 
                                f.add(new Button("button " + i +
                                        ", " + j)) ;
                }

                else if (l.equals("border")) {
                        f.setLayout(new BorderLayout()) ;
                        f.add(new Button("North"), "North") ;
                        f.add(new Button("South"), "South") ;
                        f.add(new Button("East"), "East") ;
                        f.add(new Button("West"), "West") ;
                        f.add(new Button("Center"), "Center") ;
                }

                else {
                        System.out.println(prompt) ;
                        System.exit(-1) ;
                }

                f.pack() ;
                f.show() ;
        }

}