texteditor.java

文件的各种操作 复制 保存 粘贴 剪切 需要设置好类 最新Java平台测试通过

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

public class TextEditor {
  Display display = new Display();
  Shell shell = new Shell(display);
  StyledText styledText;
  boolean unsaved;
  File file;
  String lastDirectory;
    
  public TextEditor() {
    shell.setLayout(new GridLayout());
    ToolBar toolBar = new ToolBar(shell, SWT.FLAT | SWT.RIGHT );
    ToolItem item1 = new ToolItem(toolBar, SWT.PUSH);
    item1.setText("New");
    item1.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        if(saveChanges())  {
          file = null;
          styledText.setText("");
        }
      }
    });
    ToolItem item2 = new ToolItem(toolBar, SWT.PUSH);
    item2.setText("Open");
    item2.addListener(SWT.Selection, new Listener() {
    public void handleEvent(Event event) {
    loadText();
      }
    });
    ToolItem item3 = new ToolItem(toolBar, SWT.PUSH);
    item3.setText("Save");
    item3.addListener(SWT.Selection, new Listener() {
    public void handleEvent(Event event) {
    saveText();
      }
    });    
    ToolItem item4 = new ToolItem(toolBar, SWT.PUSH);
    item4.setText("Copy");
    item4.addListener(SWT.Selection, new Listener() {
    public void handleEvent(Event event) {
    styledText.copy();
      }
    });
    ToolItem item5 = new ToolItem(toolBar, SWT.PUSH);
    item5.setText("Cut");
    item5.addListener(SWT.Selection, new Listener() {
    public void handleEvent(Event event) {
    styledText.cut();
      }
    });
    ToolItem item6 = new ToolItem(toolBar, SWT.PUSH);
    item6.setText("Paste");
    item6.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        styledText.paste();
      }
    });
	ToolItem item7 = new ToolItem(toolBar, SWT.PUSH);
    item7.setText("Exit");
    item7.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        if(saveChanges())
          shell.dispose();
      }
    });
    toolBar.pack();
    styledText =
      new StyledText(shell,SWT.MULTI| SWT.WRAP|SWT.BORDER|SWT.H_SCROLL|SWT.V_SCROLL);
    styledText.setLayoutData(new GridData(GridData.FILL_BOTH));
    Font font = new Font(shell.getDisplay(), "Book Antiqua",12, SWT.NORMAL);
    styledText.setFont(font);
    styledText.addModifyListener(new ModifyListener() {
      public void modifyText(ModifyEvent e) {
        unsaved = true;
      }
    });    
    shell.setText("Editor");
    shell.setSize(400, 200);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }

   boolean saveChanges() {
    if(! unsaved)
      return true;
    MessageBox box = new MessageBox(shell, SWT.ICON_WARNING | SWT.YES | SWT.NO | SWT.CANCEL);
    box.setMessage("save changes? " );
    box.setText("Editor");
    int condition = box.open();
    if(condition == SWT.YES) {
      return saveText();
    }else if(condition == SWT.NO) {
      return true;
    }else{
      return false;
    }
  }

  boolean loadText() {
    FileDialog dialog = new FileDialog(shell, SWT.OPEN);
    if (lastDirectory != null)
      dialog.setFilterPath(lastDirectory);

  String selectedFile = dialog.open();
   if (selectedFile == null) {
        System.out.println("File is not opened");
        return false;
      }
    file = new File(selectedFile);
    lastDirectory = file.getParent();
    
    try {
      BufferedReader reader = new BufferedReader(new FileReader(file));
      StringBuffer buffer = new StringBuffer();
      String line = null;
      while((line = reader.readLine()) != null) {
        buffer.append(line);
        buffer.append("\r\n");
      }
      styledText.setText(buffer.toString());
      return true;
    }catch(IOException e) {}      
      return false;
  }

  boolean saveText() {
    if (file == null) {
      FileDialog fileDialog = new FileDialog(shell, SWT.SAVE);
      if (lastDirectory != null)
      fileDialog.setFilterPath(lastDirectory);

      String selectedFile = fileDialog.open();
       if (selectedFile == null) {
        System.out.println("File is not saved");
        return false;
      }
      file = new File(selectedFile);
      lastDirectory = file.getParent();
    }
  try {
      FileWriter writer = new FileWriter(file);
      writer.write(styledText.getText());
      writer.close();
      unsaved = false;
      return true;
    } catch (IOException e) {}
    return false;
  }
   public static void main(String[] args) {
    new TextEditor();
  }
}