import java.awt.*;
import javax.swing.*;

/** Various examples of layouts in the Swing library, useful for 
  * positioning and arranging components in a graphical user 
  * interface.
  * For more information about layout in Swing, see:
  * http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html
  *
  * 
  */


class LayoutExample {
  // Flow layout arranges components in rows, creating a new row
  // when there is no more room in the current row.
  // Does not resize any of the components.
  public static void flowLayout() {
    JButton b1, b2, b3, b4, b5;
    b1 = new JButton("OneReallyLongButtonName");
    b2 = new JButton("Two");
    b3 = new JButton("Three");
    b4 = new JButton("Four");
    b5 = new JButton("Five");
    JFrame frame = new JFrame("Flow Layout");
    frame.setSize(200,200);
    
    Container panel = frame.getContentPane();
    panel.setLayout(new FlowLayout());
    panel.add(b1);
    panel.add(b2);
    panel.add(b3);
    panel.add(b4);
    panel.add(b5);
    
    frame.setVisible(true);
  }
  
  // Border Layout divides the screen in to 5 regions
  // When components are added, they must specify the region to which they 
  // belong.
  // 
  // Components in the NORTH and SOUTH regions are stretched 
  // horizontally so that they fill the panel.
  // Components in the WEST and EAST region are stretched vertically 
  // to meet the NORTH and SOUTH components.
  // The CENTER component is stretched to fill the remaining space.
  public static void borderLayout() {
    JButton b1, b2, b3, b4, b5;
    b1 = new JButton("One");
    b2 = new JButton("Two");
    b3 = new JButton("Three");
    b4 = new JButton("Four");
    b5 = new JButton("Five");
    
    JFrame frame = new JFrame("Border Layout");
    frame.setSize(300,200);
    
    Container panel = frame.getContentPane();
    // panel.setLayout(new BorderLayout());   
    // BorderLayout is default for content pane
    panel.add(b1, BorderLayout.NORTH);
    //panel.add(b2, BorderLayout.WEST);
    panel.add(b3, BorderLayout.NORTH);
    panel.add(b5, BorderLayout.SOUTH);
    b3.setVisible(false);
    frame.setVisible(true);
    
  }
  
  // Grid layout
  // 
  // Divides the container into a grid of cells, 
  // the constructor must specify the 
  // number of rows and columns.
  // Each cell contains one component. Components are sized to fill entire cell.
  public static void gridLayout() {
    JButton b1, b2, b3, b4, b5;
    b1 = new JButton("One");
    b2 = new JButton("Two");
    b3 = new JButton("Three");
    b4 = new JButton("Four");
    b5 = new JButton("Five");
    
    JFrame frame = new JFrame("Grid Layout");
    frame.setSize(200,300);
    
    Container panel = frame.getContentPane();
    panel.setLayout(new GridLayout(3,2)); // three rows, two columns
    panel.add(b1); // row 1, column 1
    panel.add(b2); // 1,2
    panel.add(b3); // 2,1
    panel.add(b4); // 2,2
    panel.add(b5); // 3,1
    
    frame.setVisible(true);
    
  }
  
  // Can nest components inside panels.
   public static void nestedLayout() {
    JButton b1, b2, b3, b4, b5;
    b1 = new JButton("One");
    b2 = new JButton("Two");
    b3 = new JButton("Three");
    b4 = new JButton("Four");
    b5 = new JButton("Five");
    
    JFrame frame = new JFrame("Nested Panels");
    frame.setSize(300,200);
    
    JPanel center_panel = new JPanel();
    // nothing in this panel (for now!)
    
    JPanel east_panel = new JPanel();
    east_panel.setLayout(new GridLayout(5,1));
    JPanel subpanel = new JPanel();
    subpanel.setLayout(new BorderLayout());
    east_panel.add(subpanel);
    subpanel.add(b1, BorderLayout.CENTER);
    east_panel.add(b2);
    east_panel.add(b3); 
    east_panel.add(b4); 
    east_panel.add(b5); 
    
    Container panel = frame.getContentPane();
    panel.setLayout(new BorderLayout());
    panel.add(center_panel, BorderLayout.CENTER);
    panel.add(east_panel, BorderLayout.EAST);
    
    frame.setVisible(true);
    
  }
  
  
}