Java Box Class: Unsolvable: aligning components to the left or right
- by user323186
I have been trying to left align buttons contained in a Box to the left, with no success.
They align left alright, but for some reason dont shift all the way left as one would imagine.
I attach the code below. Please try compiling it and see for yourself. Seems bizarre to me.
Thanks, Eric
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class MainGUI extends Box implements ActionListener{
//Create GUI Components
Box centerGUI=new Box(BoxLayout.X_AXIS);
Box bottomGUI=new Box(BoxLayout.X_AXIS);
//centerGUI subcomponents
JTextArea left=new JTextArea(), right=new JTextArea();
JScrollPane leftScrollPane = new JScrollPane(left), rightScrollPane = new JScrollPane(right);
//bottomGUI subcomponents
JButton encrypt=new JButton("Encrypt"), decrypt=new JButton("Decrypt"), close=new JButton("Close"), info=new JButton("Info");
//Create Menubar components
JMenuBar menubar=new JMenuBar();
JMenu fileMenu=new JMenu("File");
JMenuItem open=new JMenuItem("Open"), save=new JMenuItem("Save"), exit=new JMenuItem("Exit");
int returnVal =0;
public MainGUI(){
super(BoxLayout.Y_AXIS);
initCenterGUI();
initBottomGUI();
initFileMenu();
add(centerGUI);
add(bottomGUI);
addActionListeners();
}
private void addActionListeners() {
open.addActionListener(this);
save.addActionListener(this);
exit.addActionListener(this);
encrypt.addActionListener(this);
decrypt.addActionListener(this);
close.addActionListener(this);
info.addActionListener(this);
}
private void initFileMenu() {
fileMenu.add(open);
fileMenu.add(save);
fileMenu.add(exit);
menubar.add(fileMenu);
}
public void initCenterGUI(){
centerGUI.add(leftScrollPane);
centerGUI.add(rightScrollPane);
}
public void initBottomGUI(){
bottomGUI.setAlignmentX(LEFT_ALIGNMENT);
//setBorder(BorderFactory.createLineBorder(Color.BLACK));
bottomGUI.add(encrypt);
bottomGUI.add(decrypt);
bottomGUI.add(close);
bottomGUI.add(info);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// find source of the action
Object source=arg0.getSource();
//if action is of such a type do the corresponding action
if(source==close){
kill();
}
else if(source==open){
//CHOOSE FILE
File file1 =chooseFile();
String input1=readToString(file1);
System.out.println(input1);
left.setText(input1);
}
else if(source==decrypt){
//decrypt everything in Right Panel and output in left panel
decrypt();
}
else if(source==encrypt){
//encrypt everything in left panel and output in right panel
encrypt();
}
else if(source==info){
//show contents of info file in right panel
doInfo();
}
else {
System.out.println("Error");
//throw new UnimplementedActionException();
}
}
private void doInfo() {
// TODO Auto-generated method stub
}
private void encrypt() {
// TODO Auto-generated method stub
}
private void decrypt() {
// TODO Auto-generated method stub
}
private String readToString(File file) {
FileReader fr = null;
try {
fr = new FileReader(file);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
BufferedReader br=new BufferedReader(fr);
String line = null;
try {
line = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
String input="";
while(line!=null){
input=input+"\n"+line;
try {
line=br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
}
return input;
}
private File chooseFile() {
//Create a file chooser
final JFileChooser fc = new JFileChooser();
returnVal = fc.showOpenDialog(fc);
return fc.getSelectedFile();
}
private void kill() {
System.exit(0);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
MainGUI test=new MainGUI();
JFrame f=new JFrame("Tester");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setJMenuBar(test.menubar);
f.setPreferredSize(new Dimension(600,400));
//f.setUndecorated(true);
f.add(test);
f.pack();
f.setVisible(true);
}
}
