//LayoutDemo
//Demonstrates the Card Layout Manager
//Andy Harris, 04/00

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class LayoutDemo extends Applet implements ActionListener{

  //Control panel components
  Panel pnlControls = new Panel();
  Button btnFirst = new Button("|<<");
  Button btnPrev = new Button("<==");
  Button btnNext = new Button("==>");
  Button btnLast = new Button(">>|");
  Button btnFlow = new Button("Flow");
  Button btnGrid = new Button("Grid");
  Button btnBorder = new Button("Border");
  Button btnNull = new Button ("Null");

  //The Cards
  Panel pnlCards = new Panel();
  CardLayout stack = new CardLayout();
  Panel pnlFlow = new Panel();
  Panel pnlGrid = new Panel();
  Panel pnlBorder = new Panel();
  Panel pnlNull = new Panel();
  
  //Components for the flow layout
  Button btnFlowA = new Button("A");
  Button btnFlowB = new Button("B");
  Label lblFlow = new Label("Flow Layout");
  Button btnFlowC = new Button("C");
  Button btnFlowD = new Button("D");

  //Components for the grid layout
  Button btnGridA = new Button("A");
  Button btnGridB = new Button("B");
  Label lblGrid = new Label("Grid");
  Label lblLayout = new Label("Layout");
  Button btnGridC = new Button("C");
  Button btnGridD = new Button("D");

  //Components for the border layout
  Button btnBorderA = new Button("A");
  Button btnBorderB = new Button("B");
  Label lblBorder = new Label("Border Layout");
  Button btnBorderC = new Button("C");
  Button btnBorderD = new Button("D");

  //Components for the null layout
  Button btnNullA = new Button("A");
  Button btnNullB = new Button("B");
  Label lblNull = new Label("Null Layout");
  Button btnNullC = new Button("C");
  Button btnNullD = new Button("D");
    
  public void init(){
    //set up the main page
    this.setLayout(new BorderLayout());
    this.add(pnlControls, BorderLayout.SOUTH);
    this.add(pnlCards, BorderLayout.CENTER);

    //set up the control panel
    pnlControls.setFont(new Font("SansSerif", Font.BOLD, 20));
    pnlControls.setLayout(new GridLayout(2,4));
    pnlControls.add(btnFlow);
    pnlControls.add(btnGrid);
    pnlControls.add(btnBorder);
    pnlControls.add(btnNull);
    
    pnlControls.add(btnFirst);
    pnlControls.add(btnPrev);
    pnlControls.add(btnNext);
    pnlControls.add(btnLast);

    //register actionListeners
    btnFlow.addActionListener(this);
    btnGrid.addActionListener(this);
    btnBorder.addActionListener(this);
    btnNull.addActionListener(this);

    btnFirst.addActionListener(this);
    btnPrev.addActionListener(this);
    btnNext.addActionListener(this);
    btnLast.addActionListener(this);

    //set up the Flow panel
    pnlFlow.setLayout(new FlowLayout());
    pnlFlow.add(btnFlowA);
    pnlFlow.add(btnFlowB);
    pnlFlow.add(lblFlow);
    pnlFlow.add(btnFlowC);
    pnlFlow.add(btnFlowD);

    //set up the Grid panel
    pnlGrid.setLayout(new GridLayout(3,2));
    pnlGrid.add(btnGridA);
    pnlGrid.add(btnGridB);
    pnlGrid.add(lblGrid);
    pnlGrid.add(lblLayout);
    pnlGrid.add(btnGridC);
    pnlGrid.add(btnGridD);

    //set up the Border panel
    pnlBorder.setLayout(new BorderLayout());
    pnlBorder.add(btnBorderA, BorderLayout.NORTH);
    pnlBorder.add(btnBorderB, BorderLayout.EAST);
    pnlBorder.add(lblBorder, BorderLayout.CENTER);
    pnlBorder.add(btnBorderC, BorderLayout.WEST);
    pnlBorder.add(btnBorderD, BorderLayout.SOUTH);

    //set up the Null panel
    pnlNull.setLayout(null);
    pnlNull.add(btnNullA);
    btnNullA.setSize (30, 30);
    btnNullA.setLocation(0,0);
    
    pnlNull.add(btnNullB);
    btnNullB.setSize (30, 30);
    btnNullB.setLocation(180,0);
    
    pnlNull.add(lblNull);
    lblNull.setSize(100,20);
    lblNull.setLocation(50,90);

    pnlNull.add(btnNullC);
    btnNullC.setSize(30, 30);
    btnNullC.setLocation(0,180);

    pnlNull.add(btnNullD);
    btnNullD.setSize (30, 30);
    btnNullD.setLocation(180,180);

    //set up the card panel
    pnlCards.setLayout(stack);
    pnlCards.setFont(new Font("SansSerif", Font.BOLD, 20));
    pnlCards.add(pnlFlow, "Flow");
    pnlCards.add(pnlGrid, "Grid");
    pnlCards.add(pnlBorder, "Border");
    pnlCards.add(pnlNull, "Null");

    
  } // end init


  public void actionPerformed(ActionEvent e){
    String theCommand = e.getActionCommand();
    if (theCommand.equals("|<<")){
      stack.first(pnlCards);
    } else if (theCommand.equals("<==")){
      stack.previous(pnlCards);
    } else if (theCommand.equals("==>")){
      stack.next(pnlCards);
    } else if (theCommand.equals(">>|")){
      stack.last(pnlCards);
    } else if (theCommand.equals("Flow")){
      stack.show(pnlCards, "Flow");
    } else if (theCommand.equals("Grid")){
      stack.show(pnlCards, "Grid");
    } else if (theCommand.equals("Border")){
      stack.show(pnlCards, "Border");
    } else if (theCommand.equals("Null")){
      stack.show(pnlCards, "Null");


    } // end if  
    //do nothing for now
  } // end actionPerformed

} // end CardDemo def