Add exit prompt to main window, remove annoying auto-genned empty tooltips

src/net/apocalypselabs/symat/Interpreter.form

@@ -177,7 +177,6 @@
             <Property name="lineWrap" type="boolean" value="true"/>
             <Property name="rows" type="int" value="2"/>
             <Property name="tabSize" type="int" value="4"/>
-            <Property name="toolTipText" type="java.lang.String" value=""/>
             <Property name="wrapStyleWord" type="boolean" value="true"/>
           </Properties>
           <Events>

src/net/apocalypselabs/symat/Interpreter.java

@@ -152,7 +152,6 @@ public class Interpreter extends javax.swing.JInternalFrame {
         mainBox.setLineWrap(true);
         mainBox.setRows(2);
         mainBox.setTabSize(4);
-        mainBox.setToolTipText("");
         mainBox.setWrapStyleWord(true);
         DefaultCaret caret = (DefaultCaret)mainBox.getCaret();
         caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);

src/net/apocalypselabs/symat/MainGUI.form

@@ -2,7 +2,7 @@
 
 <Form version="1.9" maxVersion="1.9" type="org.netbeans.modules.form.forminfo.JFrameFormInfo">
   <Properties>
-    <Property name="defaultCloseOperation" type="int" value="3"/>
+    <Property name="defaultCloseOperation" type="int" value="0"/>
     <Property name="title" type="java.lang.String" value="SyMAT"/>
     <Property name="minimumSize" type="java.awt.Dimension" editor="org.netbeans.beaninfo.editors.DimensionEditor">
       <Dimension value="[640, 540]"/>

src/net/apocalypselabs/symat/MainGUI.java

@@ -30,22 +30,16 @@ package net.apocalypselabs.symat;
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics;
-import java.awt.GraphicsEnvironment;
 import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 import java.beans.PropertyVetoException;
-import java.io.BufferedReader;
 import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.net.URISyntaxException;
-import java.net.URL;
 import java.util.Calendar;
 import java.util.Date;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import javax.swing.ImageIcon;
 import javax.swing.JInternalFrame;
+import javax.swing.JOptionPane;
 import javax.swing.ListModel;
 import javax.swing.UIManager;
 
@@ -83,6 +77,21 @@ public class MainGUI extends javax.swing.JFrame {
                 getClass().getResource("icon.png"))).getImage());
         setLocationRelativeTo(null);
 
+        addWindowListener(new WindowAdapter() {
+
+            @Override
+            public void windowClosing(WindowEvent we) {
+                int p = JOptionPane.showConfirmDialog(MainGUI.mainPane,
+                        "Are you sure you want to exit SyMAT?",
+                        "Exit SyMAT",
+                        JOptionPane.YES_NO_OPTION,
+                        JOptionPane.QUESTION_MESSAGE);
+                if (p == JOptionPane.YES_OPTION) {
+                    System.exit(0);
+                }
+            }
+        });
+
         setButtonShortcuts();
 
         // Open initial windows
@@ -272,7 +281,7 @@ public class MainGUI extends javax.swing.JFrame {
         recentFileBtn = new javax.swing.JButton();
         recentItemsTitle = new javax.swing.JLabel();
 
-        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
+        setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
         setTitle("SyMAT");
         setMinimumSize(new java.awt.Dimension(640, 540));
         addComponentListener(new java.awt.event.ComponentAdapter() {
@@ -743,7 +752,7 @@ public class MainGUI extends javax.swing.JFrame {
         }
         //</editor-fold>
         //</editor-fold>
-        
+
         try {
             // Ubuntu font for prettifying
             ubuntuRegular = Font.createFont(Font.TRUETYPE_FONT,

src/net/apocalypselabs/symat/SplashScreen.form

@@ -50,7 +50,6 @@
           <Image iconType="3" name="/net/apocalypselabs/symat/splash.gif"/>
         </Property>
         <Property name="text" type="java.lang.String" value="&lt;html&gt;&lt;br&gt;&lt;br&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;"/>
-        <Property name="toolTipText" type="java.lang.String" value=""/>
         <Property name="horizontalTextPosition" type="int" value="0"/>
       </Properties>
       <Constraints>

src/net/apocalypselabs/symat/SplashScreen.java

@@ -83,7 +83,6 @@ public class SplashScreen extends javax.swing.JFrame {
         dispLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
         dispLabel.setIcon(new javax.swing.ImageIcon(getClass().getResource("/net/apocalypselabs/symat/splash.gif"))); // NOI18N
         dispLabel.setText("<html><br><br>&nbsp;&nbsp;&nbsp;");
-        dispLabel.setToolTipText("");
         dispLabel.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
         getContentPane().add(dispLabel);
         dispLabel.setBounds(0, 0, 400, 320);