Adding fourth PR(module4)

dollyraj/text_editor/src/app/Text_editor.java

@@ -0,0 +1,397 @@
+package app;
+
+//DAY 1
+import java.awt.EventQueue;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Font;
+import javax.swing.UIManager;
+import javax.swing.JFrame;
+import javax.swing.JScrollPane;
+import javax.swing.JTextPane;
+
+//DAY 2
+import java.awt.Insets;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.File;
+import javax.swing.JButton;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+
+//DAY 3
+import javax.swing.JFileChooser;
+import java.util.Scanner;
+import java.util.Formatter;
+import javax.swing.JOptionPane;
+
+//DAY 4
+import javax.swing.text.StyledDocument;
+import javax.swing.text.AttributeSet;
+import javax.swing.text.Element;
+import javax.swing.text.MutableAttributeSet;
+import javax.swing.text.StyleConstants;
+import javax.swing.text.SimpleAttributeSet;
+import javax.swing.event.UndoableEditEvent;
+import javax.swing.event.UndoableEditListener;
+import javax.swing.undo.UndoManager;
+
+
+
+public class Text_editor {
+
+	private final String title="Simple Text Editor";
+	private JFrame frame;
+	private JTextPane textArea;
+	private File openFile;
+	private JButton bold;
+	private JButton italics;
+	private JButton undo;
+	private JButton redo;
+	UndoManager manager=new UndoManager();
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		EventQueue.invokeLater(new Runnable(){
+			public void run() {
+				try {
+					UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
+					Text_editor window =new Text_editor();
+				    window.frame.setLocationRelativeTo(null);
+			        window.frame.setVisible(true);
+				}
+
+				catch(Exception e)
+				{
+					e.printStackTrace();
+				}
+			}
+		});   
+	}
+
+
+    public Text_editor() {
+	           initialize();
+   }
+
+
+    public void initialize() {
+
+    	frame =new JFrame("Editor");
+    	frame.setAutoRequestFocus(false);
+    	frame.setTitle(title);
+    	frame.setBounds(100,100,616,444);
+    	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    	frame.getContentPane().setLayout(new BorderLayout(0,0));
+
+
+    	textArea=new JTextPane();
+    	textArea.setBackground(Color.GRAY);
+    	textArea.setForeground(Color.WHITE);
+    	frame.getContentPane().add(textArea,BorderLayout.NORTH);
+
+    	Font textFont=new Font(Font.SANS_SERIF,Font.PLAIN,15);
+        textArea.setFont(textFont);
+        textArea.setCaretColor(Color.WHITE);
+
+
+    	JScrollPane scroll=new JScrollPane(textArea);
+    	frame.getContentPane().add(scroll,BorderLayout.CENTER);
+
+
+    	JMenuBar menuBar =new JMenuBar();
+    	menuBar.setMargin(new Insets(0,5,0,0));
+    	menuBar.setBackground(Color.WHITE);
+    	menuBar.setForeground(Color.BLACK);
+    	frame.getContentPane().add(menuBar,BorderLayout.NORTH);
+
+
+    	JMenu file=new JMenu("File");
+    	menuBar.add(file);
+    	menuBar.add(new JMenu("|")).setEnabled(false);
+
+    	JMenuItem newFile=new JMenuItem("New");
+    	newFile.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e)
+    		{
+    			newFile();
+    		}
+    	});
+    	file.add(newFile);
+    	file.addSeparator();
+
+    	JMenuItem open=new JMenuItem("Open");
+    	open.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e)
+    		{
+    			open();
+    		}
+    	});
+
+    	file.add(open);
+    	file.addSeparator();
+
+
+    	JMenuItem saveFile=new JMenuItem("Save");
+    	saveFile.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e)
+    		{
+    			save();
+    		}
+    	});
+
+    	file.add(saveFile);
+    	file.addSeparator();
+
+    	JMenuItem saveasFile=new JMenuItem("Save As");
+    	saveasFile.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e)
+    		{
+    			saveas();
+    		}
+    	});
+
+    	file.add(saveasFile);
+    	file.addSeparator();
+
+    	JMenuItem closeFile=new JMenuItem("Close");
+    	closeFile.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e)
+    		{
+    			close();
+    		}
+    	});
+
+    	file.add(closeFile);
+    	file.addSeparator();
+
+    	JMenu edit=new JMenu("Edit");
+    	menuBar.add(edit);
+    	menuBar.add(new JMenu("|")).setEnabled(false);
+
+    	JMenuItem copyFile=new JMenuItem("Copy");
+    	copyFile.addActionListener(e->textArea.copy());
+    	edit.add(copyFile);
+    	edit.addSeparator();
+
+    	JMenuItem cutFile=new JMenuItem("Cut");
+    	cutFile.addActionListener(e->textArea.cut());
+    	edit.add(cutFile);
+    	edit.addSeparator();
+
+    	JMenuItem pasteFile=new JMenuItem("Paste");
+    	pasteFile.addActionListener(e->textArea.paste());
+    	edit.add(pasteFile);
+    	edit.addSeparator();
+
+
+    	JMenu exit=new JMenu("Exit");
+    	exit.addActionListener(e->System.exit(0));
+    	menuBar.add(exit);
+
+    	JPanel panel=new JPanel();
+    	panel.setBackground(Color.WHITE);
+    	panel.setSize(100,100);
+    	frame.getContentPane().add(panel,BorderLayout.SOUTH);
+
+    	bold=new JButton();
+    	bold.setText("BOLD");
+    	bold.setBackground(Color.GRAY);
+    	bold.addActionListener(e->Bold());
+
+    	italics=new JButton();
+    	italics.setText("Italics");
+    	italics.setBackground(Color.GRAY);
+    	italics.addActionListener(e->Italics());
+
+    	undo=new JButton();
+    	undo.setText("Undo");
+    	undo.setBackground(Color.GRAY);
+
+
+    	redo=new JButton();
+    	redo.setText("Redo");
+    	redo.setBackground(Color.GRAY);
+
+    	undo.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e) {
+    			try {
+    				  manager.undo();
+    			}catch(Exception ex) {
+    		}
+    		}
+    	});
+
+    	redo.addActionListener(new ActionListener() {
+    		public void actionPerformed(ActionEvent e) {
+    			try {
+    				  manager.redo();
+    			}catch(Exception ex) {
+
+    			}
+    		}
+    	});
+
+
+    	textArea.getDocument().addUndoableEditListener(new UndoableEditListener() {
+    		public void undoableEditHappened(UndoableEditEvent e) {
+    			manager.addEdit(e.getEdit());
+    		}
+    	});
+
+    	panel.add(undo);
+    	panel.add(redo);
+    	panel.add(bold);
+    	panel.add(italics);
+
+
+
+
+
+    }
+
+    private void open() {
+    	try {
+    		  JFileChooser chooser=new JFileChooser();
+    		  chooser.setDialogTitle("Select a file To Open");
+    		  chooser.showOpenDialog(null);
+
+    		  File selectedFile=chooser.getSelectedFile();
+    		  if(!selectedFile.exists()) {
+    			  //ERROR message
+    			  JOptionPane.showMessageDialog(null,"Failed to open a file,file doesn't exist","Error",JOptionPane.ERROR_MESSAGE);
+    			  openFile=null;
+    			  return;
+    		  }
+
+    		  Scanner reader=new Scanner(selectedFile);
+    		  String contents="";
+    		  while(reader.hasNextLine()) {
+    			  contents+=reader.nextLine()+"\n";
+    		  }
+
+    		  reader.close();
+    		  textArea.setText(contents);
+    		  openFile=selectedFile;
+
+    		  frame.setTitle(title+"-"+selectedFile.getName());
+    	}catch(Exception e) {
+    		e.printStackTrace();
+    	}
+    }
+
+
+    private void saveas() {
+    	try {
+    		 JFileChooser chooser=new JFileChooser();
+    		 chooser.setDialogTitle("Choose location to save");
+    		 int save=chooser.showSaveDialog(null);
+
+    		 if(save==JFileChooser.CANCEL_OPTION) {
+    			 System.exit(-1);
+    		 }
+
+    		 openFile=chooser.getSelectedFile();
+
+    		 save();
+    	}catch(Exception e) {
+    		e.printStackTrace();
+    	}
+    }
+
+
+
+    private void save() {
+    	try {
+    		String text=textArea.getText().trim();
+    		if(!text.equals("") && openFile==null) {
+    			saveas();
+    			return;
+    		}
+
+    		if(openFile==null && text.equals("")) {
+    			//ERROR MESSAGE
+    			JOptionPane.showMessageDialog(null, "Can't save,No file is selected","Error",JOptionPane.ERROR_MESSAGE);
+    			return;
+    		}
+
+    		String contents=textArea.getText();
+    		Formatter form=new Formatter(openFile);
+    		form.format("%s", contents);
+    		form.close();
+
+    		frame.setTitle(title+"-"+openFile.getName());
+
+    	}catch(Exception e) {
+    		e.printStackTrace();
+    	}
+    }
+
+
+    private void close() {
+    	if(openFile==null) {
+    		JOptionPane.showMessageDialog(null,"failed to close the file,No file is selected","Error",JOptionPane.ERROR_MESSAGE);
+    		return;
+    	}
+    	try {
+    		 int input=JOptionPane.showConfirmDialog(null,"Do you want to save before closing?","Wait!",JOptionPane.YES_NO_OPTION);
+    		 if(input==JOptionPane.YES_OPTION)
+    			 save();
+
+    	textArea.setText("");
+    	openFile=null;
+    	frame.setTitle(title);
+    }catch(Exception e) {
+    	e.printStackTrace();
+    }
+
+    } 
+
+
+    private void newFile() {
+    	if(openFile!=null) {
+    		JOptionPane.showMessageDialog(null,"Please close or save the opened file","ERROR",JOptionPane.ERROR_MESSAGE);
+    		return;
+    	}
+
+    	textArea.setText("");
+    }
+
+    private void Bold() {
+    	StyledDocument doc=(StyledDocument) textArea.getDocument();
+    	int selectionEnd=textArea.getSelectionEnd();
+    	int selectionStart=textArea.getSelectionStart();
+    	if(selectionStart==selectionEnd) {
+    		return;
+    	}
+
+    	Element element=doc.getCharacterElement(selectionStart);
+    	AttributeSet as=element.getAttributes();
+    	MutableAttributeSet asNew=new SimpleAttributeSet(as.copyAttributes());
+    	StyleConstants.setBold(asNew,!StyleConstants.isBold(as));
+    	doc.setCharacterAttributes(selectionStart,textArea.getSelectedText().length(),asNew,true);
+    	String text=(StyleConstants.isBold(as)?"Cancel Bold":"Bold");
+    	bold.setText(text);
+    }
+
+    private void Italics() {
+    	StyledDocument doc=(StyledDocument) textArea.getDocument();
+    	int selectionEnd=textArea.getSelectionEnd();
+    	int selectionStart=textArea.getSelectionStart();
+    	if(selectionStart==selectionEnd) {
+    		return;
+    	}
+
+    	Element element=doc.getCharacterElement(selectionStart);
+    	AttributeSet as=element.getAttributes();
+    	MutableAttributeSet asNew=new SimpleAttributeSet(as.copyAttributes());
+    	StyleConstants.setItalic(asNew,!StyleConstants.isItalic(as));
+    	doc.setCharacterAttributes(selectionStart,textArea.getSelectedText().length(),asNew,true);
+    	//String text=(StyleConstants.isBold(as)?"Cancel Bold":"Bold");
+    	//bold.setText(text);
+    }
+}
+