/*
        Name:           Chris Johnson
                        johnson@dcs.gla.ac.uk
 
        Last modified:  10/1/2000
 
        Description:
This applet lays out buttons and labels to form a timetable.
It is part of exercise 2 from the user interface design in Java course on:
 
                http://www.dcs.gla.ac.uk/~johnson/teaching/hci-java
 
It uses the NewGridBagLayout class designed by G.W. Rouse in
An Introduction to Data Structures and Algorithms with Java,
Prentice Hall, Hemel Hemstead, 1998. pp 65-78.   The details
of this class will be introduced in later practicals - it provides
a useful means of minimising the initial complexity in developing
an AWT interface.
*/
 
import java.applet.*;           // you should have met this before
import java.net.*;
 
import java.awt.*;                              // link to the AWT classes
import java.awt.event.*;

import NewGridBagLayout;                // we will learn more about
					//layout managers in later practicals
 
 
public class TimetableButtons extends Applet implements ActionListener{
 
// Panels are components that can contain other components, such as labels.
// we will use a panel to contain the labels that make up the timetable.
 
        private Panel timetable = new Panel();
 
 
// The following lines provide access to a customised layout manager.
// This provides a quick means of placing labels in particular
// positions on the screen
 
        NewGridBagLayout layout = new NewGridBagLayout();
 
 
/* Note
 We now have to declare the interface objects outside of the init()
method because we want to interact with the buttons later on...
*/
 
        Button UID_slot1 = new Button("UID1");  // create new buttons
        Button UID_slot2 = new Button("UID2");
        Button UID_tutorial = new Button("UID tutorial");


// We define sme string constants to help us identify when a button
// is pressed.

	static final String UID1 = "uid1";
	static final String UID2 = "uid2";
	static final String UID_Tut = "uid_tutorial";
 
 
 
        Label Time_0900 = new Label("09.00");  // create new labels
        Label Time_1000 = new Label("10.00");
        Label Time_1100 = new Label("11.00");
        Label Time_1200 = new Label("12.00");
        Label Time_1300 = new Label("13.00");
        Label Time_1400 = new Label("14.00");
        Label Time_1500 = new Label("15.00");
        Label Time_1600 = new Label("16.00");
        Label Time_1700 = new Label("17.00");
        Label Time_1800 = new Label("18.00");
 
 
        Label Monday = new Label("Monday", Label.RIGHT);
        Label Tuesday = new Label("Tuesday", Label.RIGHT);
        Label Wednesday = new Label("Wednesday", Label.RIGHT);
        Label Thursday = new Label("Thursday", Label.RIGHT);
        Label Friday = new Label("Friday", Label.RIGHT);
 
    public void init() {
 
        timetable.setLayout(layout); // set up the layout manager
 
        /*
	These calls add the labels at appropriate places on the screen
        The first parameter is the name of the label component to be
	added eg Time_0900 The second parameter is the panel component 
        that holds all of the label components.   The third and fourth
        parameters sets the X and Y coordinates of the label.   The
        fifth and sixth parameters sets width and height of the label
	*/
 
        layout.setPositionSizeAdd(Time_0900, timetable, 1, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1000, timetable, 2, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1100, timetable, 3, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1200, timetable, 4, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1300, timetable, 5, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1400, timetable, 6, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1500, timetable, 7, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1600, timetable, 8, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1700, timetable, 9, 1, 1, 1);
        layout.setPositionSizeAdd(Time_1800, timetable, 10, 1, 1, 1);
 
        layout.setPositionSizeAdd(Monday,       timetable, 0, 3, 1, 1);
        layout.setPositionSizeAdd(Tuesday,      timetable, 0, 4, 1, 1);
        layout.setPositionSizeAdd(Wednesday,	timetable, 0, 5, 1, 1);
        layout.setPositionSizeAdd(Thursday, 	timetable, 0, 6, 1, 1);
        layout.setPositionSizeAdd(Friday,       timetable, 0, 7, 1, 1);
 
        layout.setPositionSizeAdd(UID_slot1, timetable, 2, 4, 1, 1);
        layout.setPositionSizeAdd(UID_slot2, timetable, 2, 6, 1, 1);
        layout.setPositionSizeAdd(UID_tutorial, timetable, 8, 4, 3, 1);
 
        UID_slot1.setActionCommand(UID1);
        UID_slot2.setActionCommand(UID2);
        UID_tutorial.setActionCommand(UID_Tut);
 
        UID_slot1.addActionListener(this);
        UID_slot2.addActionListener(this);
        UID_tutorial.addActionListener(this);
 
       add(timetable);
 
        validate();
 
    }
 
   public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
/* 
This implements an event handler to call the specified web page
whenever a particular button is selected.   If you add more 
buttons to the page then you will have to introduce further conditions
in the if-statement.   Just copy the lines up to the "end of UID if-case"
but alter the URL to point to the relevant lecturer/course home page.
*/
        if((command== UID1) || (command== UID2) ||
                (command== UID_Tut))
        {
                try
                {
                        URL UID_home = new
				URL("http://www.dcs.gla.ac.uk/~johnson/teaching/hci-java");
                        getAppletContext().showDocument(UID_home);
                } catch (Exception e)
                {
                        showStatus("Error " + e);
                }
        } // end of UID if-case
    }
}