/**
* An interface action has been performed. Find out what it was and handle it.
*
* @param event The event that has occured.
*/
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
if (command.equals("0")
|| command.equals("1")
|| command.equals("2")
|| command.equals("3")
|| command.equals("4")
|| command.equals("5")
|| command.equals("6")
|| command.equals("7")
|| command.equals("8")
|| command.equals("9")) {
int number = Integer.parseInt(command);
calc.numberPressed(number);
} else if (command.equals("A")
|| command.equals("B")
|| command.equals("C")
|| command.equals("D")
|| command.equals("E")
|| command.equals("F")) {
int number = getNumberFromHexString(command);
calc.numberPressed(number);
} else if (command.equals("+")) {
calc.plus();
} else if (command.equals("-")) {
calc.minus();
} else if (command.equals("=")) {
calc.equals();
} else if (command.equals("C")) {
calc.clear();
} else if (command.equals("?")) {
showInfo();
}
// Exercise 1 multi
else if (command.equals("*")) {
calc.multiplication();
}
// Exercise 1 division
else if (command.equals("/")) {
calc.division();
} else if (command.equals("Cl")) {
// had to change this, so it works in hexadecimal mode
calc.clear();
} else if (command.equals("Hexadecimal mode")) {
calc.flipHexSwitch(); // flip the switch
}
// else unknown command.
redisplay();
}
/** Update the interface display to show the current value of the calculator. */
private void redisplay() {
if (calc.isHexOn()) {
int displayInt = calc.getDisplayValue();
if (displayInt < 0) {
// toHexString() returns an unsigned integer as a String,
// meaning negative values return (String)(ffffffff - n) instead of (-n)
// example: -9 would show ffffffff - 9 = fffffff4
display.setText("-" + Integer.toHexString(Math.abs(displayInt)));
} else {
display.setText(Integer.toHexString(displayInt));
}
// show all hexButtons since hexSwitch is true
hexPanel.setVisible(true);
} else {
display.setText("" + calc.getDisplayValue());
// hide all hexButtons since hexSwitch is false
hexPanel.setVisible(false);
}
}
/** Make the frame for the user interface. */
private void makeFrame() {
frame = new JFrame(calc.getTitle());
JPanel contentPane = (JPanel) frame.getContentPane();
contentPane.setLayout(new BorderLayout(8, 8));
contentPane.setBorder(new EmptyBorder(20, 20, 20, 20));
display = new JTextField();
contentPane.add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel(new GridLayout(5, 4));
addButton(buttonPanel, "7");
addButton(buttonPanel, "8");
addButton(buttonPanel, "9");
addButton(buttonPanel, "Cl");
// had to change this, so it works in hexadecimal mode
addButton(buttonPanel, "4");
addButton(buttonPanel, "5");
addButton(buttonPanel, "6");
addButton(buttonPanel, "?");
addButton(buttonPanel, "1");
addButton(buttonPanel, "2");
addButton(buttonPanel, "3");
addButton(buttonPanel, "0");
addButton(buttonPanel, "+");
addButton(buttonPanel, "-");
// Exercise 1 division
addButton(buttonPanel, "/");
// Exercise 1 multi
addButton(buttonPanel, "*");
addButton(buttonPanel, "=");
contentPane.add(buttonPanel, BorderLayout.CENTER);
status = new JLabel(calc.getAuthor());
contentPane.add(status, BorderLayout.SOUTH);
// hexa stuff
JPanel hexContainer = new JPanel(new GridLayout(2, 1));
JCheckBox hexBox = new JCheckBox("Hexadecimal mode");
hexBox.addActionListener(this);
hexContainer.add(hexBox);
hexPanel = new JPanel(new GridLayout(2, 3));
addButton(hexPanel, "A");
addButton(hexPanel, "B");
addButton(hexPanel, "C");
addButton(hexPanel, "D");
addButton(hexPanel, "E");
addButton(hexPanel, "F");
hexContainer.add(hexPanel);
hexPanel.setVisible(false); // hide it because we start in decimal mode
contentPane.add(hexContainer, BorderLayout.EAST);
frame.pack();
}
/**
* Toggle the info display in the calculator's status area between the author and version
* information.
*/
private void showInfo() {
if (showingAuthor) status.setText(calc.getVersion());
else status.setText(calc.getAuthor());
showingAuthor = !showingAuthor;
}