javacc-7.0.3.examples.GUIParsing.TokenMgrVersion.CalcGUI Maven / Gradle / Ivy
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JavaCC is a parser/scanner generator for Java.
/* Copyright (c) 2006, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.awt.*;
public class CalcGUI extends Frame implements CalcInputParserConstants {
/**
* A button object is created for each calculator button. Since
* there is going to be only one calculator GUI, these objects can
* be static.
*/
static Button one = new Button("1");
static Button two = new Button("2");
static Button three = new Button("3");
static Button four = new Button("4");
static Button five = new Button("5");
static Button six = new Button("6");
static Button seven = new Button("7");
static Button eight = new Button("8");
static Button nine = new Button("9");
static Button zero = new Button("0");
static Button dot = new Button(".");
static Button equal = new Button("=");
static Button add = new Button("+");
static Button sub = new Button("-");
static Button mul = new Button("*");
static Button div = new Button("/");
static Button quit = new Button("QUIT");
/**
* The display window with its initial setting.
*/
static Label display = new Label("0 ");
/**
* The class that collects the characters produced by the GUI
*/
static final CharCollector collector = new CharCollector();
static final CharStream getCollector()
{
return collector;
}
/**
* string that holds what the calculator displays
*/
static String label = "0";
/**
* flag to indicate if this is the first digit.
*/
static boolean firstDigit = true;
/**
* Indicates an error has occured
*/
static boolean error = false;
/**
* Constructor that creates the full GUI. This is called by the
* main program to create one calculator GUI.
*/
public CalcGUI() {
super("Calculator");
GridBagLayout gb = new GridBagLayout();
setLayout(gb);
GridBagConstraints gbc = new GridBagConstraints();
display.setFont(new Font("TimesRoman", Font.BOLD, 18));
display.setAlignment(Label.RIGHT);
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1.0;
gbc.weighty = 0.0;
gb.setConstraints(display, gbc);
add(display);
Panel buttonPanel = new Panel();
buttonPanel.setFont(new Font("TimesRoman", Font.BOLD, 14));
buttonPanel.setLayout(new GridLayout(4,4));
buttonPanel.add(one); buttonPanel.add(two); buttonPanel.add(three); buttonPanel.add(four);
buttonPanel.add(five); buttonPanel.add(six); buttonPanel.add(seven); buttonPanel.add(eight);
buttonPanel.add(nine); buttonPanel.add(zero); buttonPanel.add(dot); buttonPanel.add(equal);
buttonPanel.add(add); buttonPanel.add(sub); buttonPanel.add(mul); buttonPanel.add(div);
gbc.weighty = 1.0;
gb.setConstraints(buttonPanel, gbc);
add(buttonPanel);
quit.setFont(new Font("TimesRoman", Font.BOLD, 14));
gbc.gridheight = GridBagConstraints.REMAINDER;
gbc.weighty = 0.0;
gb.setConstraints(quit, gbc);
add(quit);
pack();
show();
}
/**
* Here we just return the character that is input.
*/
public boolean handleEvent(Event evt) {
char c = 0;
if (evt.id != Event.ACTION_EVENT) {
return false;
}
if (evt.target == quit) {
System.exit(0);
}
if (error)
{
if (evt.target == zero)
{
error = false;
print("0");
firstDigit = true;
return true;
}
return false;
}
if (evt.target == equal) {
c = '=';
firstDigit = true;
}
else if (evt.target == add) {
c = '+';
label = "0";
firstDigit = true;
}
else if (evt.target == sub) {
c = '-';
label = "0";
firstDigit = true;
}
else if (evt.target == mul) {
c = '*';
label = "0";
firstDigit = true;
}
else if (evt.target == div) {
c = '/';
label = "0";
firstDigit = true;
}
else
{
if (firstDigit)
label = "";
firstDigit = false;
if (evt.target == one) {
c = '1';
label += c;
}
else if (evt.target == two) {
c = '2';
label += c;
}
else if (evt.target == three) {
c = '3';
label += c;
}
else if (evt.target == four) {
c = '4';
label += c;
}
else if (evt.target == five) {
c = '5';
label += c;
}
else if (evt.target == six) {
c = '6';
label += c;
}
else if (evt.target == seven) {
c = '7';
label += c;
}
else if (evt.target == eight) {
c = '8';
label += c;
}
else if (evt.target == nine) {
c = '9';
label += c;
}
else if (evt.target == zero) {
c = '0';
label += c;
}
else if (evt.target == dot) {
c = '.';
label += ".";
}
else
return false;
}
print(label);
collector.put(c);
return true;
}
public static void print(double value) {
display.setText(label = Double.toString(value));
}
public static void print(String image) {
display.setText(label = image);
}
public static void Error(String image) {
print(image);
Toolkit.getDefaultToolkit().beep();
collector.Clear();
label = "0";
error = true;
}
}