JFace 的 ApplicationWindow 类应用实例

本文中代码主要参考了《Eclipse SWT/JFace 核心应用》第15章的程序。

 

本文介绍了一个使用ApplicationWindow 和Action 实现的一个文本编辑器。界面美观，基本功能齐全。代码齐全。

 

首先看 MainWindow.java。

//MainWindow.java

import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.action.StatusLineManager;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class MainWindow extends ApplicationWindow{
	private NewAction newAction;
	private OpenAction openAction;
	private SaveAction saveAction;
	private SaveAsAction saveAsAction;
	private ExitAction exitAction;
	private CopyAction copyAction;
	private CutAction cutAction;
	private PasteAction pasteAction;
	private HelpAction helpAction;
	private FileManager manager;
	private Text content;
	private static MainWindow app;
	
	private MainWindow(){
		super(null);
		app = this;
		manager = new FileManager();
		newAction = new NewAction();
		openAction = new OpenAction();
		saveAction = new SaveAction();
		saveAsAction = new SaveAsAction();
		exitAction = new ExitAction();
		copyAction = new CopyAction();
		cutAction = new CutAction();
		pasteAction = new PasteAction();
		helpAction = new HelpAction();
		
		this.addMenuBar();
		this.addToolBar(SWT.FLAT);
		this.addStatusLine();
	}
	
	public static MainWindow getApp(){
		return app;
	}
	
	protected void configureShell(Shell shell){
		super.configureShell(shell);
		shell.setText("简单写字板");
		shell.setMaximized(true);
	}
	
	protected Control createContents(Composite parent){
		content = new Text(parent, SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL);
		content.addModifyListener(new ModifyListener(){
			public void modifyText(ModifyEvent e){
				manager.setDirty(true);
			}
		});
		return parent;
	}
	
	protected MenuManager createMenuManager(){
		MenuManager menuBar = new MenuManager();
		
		MenuManager fileMenu = new MenuManager("文件(&F)");
		MenuManager editMenu = new MenuManager("编辑(&E)");
		MenuManager formatMenu = new MenuManager("格式(&F)");
		MenuManager helpMenu = new MenuManager("帮助(&H)");
		
		menuBar.add(fileMenu);
		menuBar.add(editMenu);
		menuBar.add(formatMenu);
		menuBar.add(helpMenu);
		
		fileMenu.add(newAction);
		fileMenu.add(openAction);
		fileMenu.add(new Separator());
		fileMenu.add(saveAction);
		fileMenu.add(saveAsAction);
		fileMenu.add(new Separator());
		fileMenu.add(exitAction);
		
		editMenu.add(copyAction);
		editMenu.add(cutAction);
		editMenu.add(pasteAction);
		
		formatMenu.add(new FormatAction(FormatAction.TYPE_FONT));
		formatMenu.add(new FormatAction(FormatAction.TYPE_BGCOLOR));
		formatMenu.add(new FormatAction(FormatAction.TYPE_FORECOLOR));
		
		helpMenu.add(helpAction);
		return menuBar;
	}
	
	public static void main(String[] args){
		MainWindow main = new MainWindow();
		main.setBlockOnOpen(true);
		main.open();
		Display.getCurrent().dispose();
	}
	
	public Text getContent(){
		return content;
	}
	public FileManager getManager(){
		return manager;
	}
	public void setManager(FileManager manager){
		this.manager = manager;
	}
	
	public StatusLineManager getStatusLineManager(){
		return super.getStatusLineManager();
	}
}

该类继承了 ApplicationWindow。Application 类是应用程序的窗口类，它继承自 Window 类。另外还添加了设置菜单栏、工具栏、状态栏等的方法。createMenuManager 方法用于添加菜单内容。addMenuBar 方法将createMenuManager 创建的菜单添加到窗口。菜单项add 方法添加一个action 对象。Action 对象在run()中实现了具体操作，我们将在后面介绍。除此之外，还需要一个FileManager 来管理打开的文件。

 

FileManager.java:

//FileManager.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;


public class FileManager {
	private String fileName;
	private boolean dirty = false;
	private String content;
	public FileManager(){
		
	}
	
	public void load(String name){
		final String textString;
		try{
			File file = new File(name);
			FileInputStream stream = new FileInputStream(file.getPath());
			Reader in = new BufferedReader(new InputStreamReader(stream));
			char[] readBuffer = new char[2048];
			StringBuffer buffer = new StringBuffer((int)file.length());
			int n;
			while((n=in.read(readBuffer))>0){
				buffer.append(readBuffer, 0 ,n);
			}
			textString = buffer.toString();
			stream.close();
		}catch(FileNotFoundException e){
			MainWindow.getApp().getStatusLineManager().setMessage("文件未找到："+fileName);
			return;
		}catch(IOException e){
			MainWindow.getApp().getStatusLineManager().setMessage("读文件出错: "+fileName);
			return;
		}
		content = textString;
		this.fileName= name;
	}
	
	public void save(String name){
		final String textString = content;
		try{
			File file = new File(name);
			FileOutputStream stream = new FileOutputStream(file.getPath());
			Writer out = new OutputStreamWriter(stream);
			out.write(textString);
			out.flush();
			stream.close();
		}catch(FileNotFoundException e){
			MainWindow.getApp().getStatusLineManager().setMessage("文件未找到："+fileName);
			return;
		}catch(IOException e){
			MainWindow.getApp().getStatusLineManager().setMessage("读文件出错: "+fileName);
			return;
		}
	}
	
	public String getContent(){
		return content;
	}
	
	public void setContent(String content){
		this.content = content;
	}
	
	public boolean isDirty(){
		return dirty;
	}
	
	public void setDirty(boolean dirty){
		this.dirty = dirty;
	}
	
	public String getFileName(){
		return fileName;
	}
	
	public void setFileName(String fileName){
		this.fileName = fileName;
	}
}

FileManager 类的 load 和 save 方法分别用于加载和保存文件。

 

用到的一些Action 类如下所示：

CopyAction.java

//CopyAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;


public class CopyAction extends Action{
	public CopyAction(){
		super();
		setText("复制(&C)");
		setToolTipText("复制");
		setAccelerator(SWT.CTRL + 'C');
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\copy.gif"));
	}
	
	public void run(){
		MainWindow.getApp().getContent().copy();
	}
}

CutAction.java

//CutAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;


public class CutAction extends Action{
	public CutAction(){
		super();
		setText("剪切(&C)");
		setToolTipText("剪切");
		setAccelerator(SWT.CTRL + 'X');
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\cut.gif"));
	}
	
	public void run(){
		MainWindow.getApp().getContent().cut();
	}
}

 

ExitAction.java

//ExitAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;


public class ExitAction extends Action{
	public ExitAction(){
		super();
		setText("退出(&E)");
		setToolTipText("退出系统");
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\exit.gif"));
	}
	
	public void run(){
		MainWindow.getApp().close();
	}
}

 

FormatAction.java

//FormatAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.FontDialog;
import org.eclipse.swt.widgets.Text;


public class FormatAction extends Action{
	public static final String TYPE_FORECOLOR = "FORECOLOR";
	public static final String TYPE_BGCOLOR = "BGCOLOR";
	public static final String TYPE_FONT = "FONT";
	private String formatType;
	public FormatAction(String type){
		super();
		this.formatType = type;
		initAction();
	}
	
	private void initAction(){
		if(formatType.equals(TYPE_FONT)){
			this.setText("设置字体");
			this.setToolTipText("设置字体");
			setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\font.gif"));
		}else if(formatType.equals(TYPE_FORECOLOR)){
			this.setText("设置前景色");
			this.setToolTipText("设置前景色");
			setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\foreColor.gif"));
		}else{
			this.setText("设置背景色");
			this.setToolTipText("设置背景色");
			setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\bgColor.gif"));
		}
	}
	
	public void run(){
		Text content = MainWindow.getApp().getContent();
		if(formatType.equals(TYPE_FONT)){
			FontDialog fontDialog = new FontDialog(MainWindow.getApp().getShell());
			fontDialog.setFontList(content.getFont().getFontData());
			FontData fontData = fontDialog.open();
			if(fontData != null){
				Font font = new Font(MainWindow.getApp().getShell().getDisplay(), fontData);
				content.setFont(font);
			}
		}else if(formatType.equals(TYPE_FORECOLOR)){
			ColorDialog colorDialog = new ColorDialog(MainWindow.getApp().getShell());
			colorDialog.setRGB(content.getForeground().getRGB());
			RGB rgb = colorDialog.open();
			if(rgb != null){
				Color foregroundColor = new Color(MainWindow.getApp().getShell().getDisplay(), rgb);
				content.setForeground(foregroundColor);
				foregroundColor.dispose();
			}
		}else{
			ColorDialog colorDialog = new ColorDialog(MainWindow.getApp().getShell());
			colorDialog.setRGB(content.getForeground().getRGB());
			RGB rgb = colorDialog.open();
			if(rgb != null){
				Color bgColor = new Color(MainWindow.getApp().getShell().getDisplay(), rgb);
				content.setForeground(bgColor);
				bgColor.dispose();
			}
		}
	}
}

 

HelpAction.java

//HelpAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.ImageDescriptor;

public class HelpAction extends Action{
    public HelpAction(){
        super();
        setText("帮助内容(&H)");
        setToolTipText("帮助");
        setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class,"icons/help.gif"));
    }

    public void run(){
        MessageDialog.openInformation(null,"帮助","谢谢使用！");
    }
}

 

NewAction.java

//NewAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;


public class NewAction extends Action{
	public NewAction(){
		super();
		setText("新建(&N)");
		this.setAccelerator(SWT.ALT + SWT.SHIFT + 'N');
		setToolTipText("新建");
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\new.gif"));
	}
	
	public void run(){
		MainWindow.getApp().getContent().setText("");
		MainWindow.getApp().setManager(new FileManager());
	}
}

 

OpenAction.java

//OpenAction.java

import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.operation.ModalContext;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;

public class OpenAction extends Action{
	public OpenAction(){
		super();
		setText("打开(&O)");
		setToolTipText("打开文件");
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\open.gif"));
	}
	
	public void run(){
		FileDialog dialog = new FileDialog(MainWindow.getApp().getShell(), SWT.OPEN);
		dialog.setFilterExtensions(new String[]{"*.java", "*.*"});
		final String name = dialog.open();
		if((name == null) || (name.length()==0))
			return;
		final FileManager fileManager = MainWindow.getApp().getManager();
		try{
			ModalContext.run(new IRunnableWithProgress(){
				public void run(IProgressMonitor progressMonitor){
					progressMonitor.beginTask("打开文件", IProgressMonitor.UNKNOWN);
					fileManager.load(name);

					progressMonitor.done();
				}
			}, true, MainWindow.getApp().getStatusLineManager().getProgressMonitor(), 
			MainWindow.getApp().getShell().getDisplay());
		}catch(InvocationTargetException e){
			e.printStackTrace();
		}catch(InterruptedException e){
			e.printStackTrace();
		}
		
		MainWindow.getApp().getContent().setText(fileManager.getContent());
		MainWindow.getApp().getStatusLineManager().setMessage("当前打开的文件是: "+name);
	}
}

 

PasteAction.java

//PasteAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;


public class PasteAction extends Action{
	public PasteAction(){
		super();
		setText("粘贴(&P)");
		setToolTipText("粘贴");
		setAccelerator(SWT.CTRL + 'V');
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\copy.gif"));
	}
	
	public void run(){
		MainWindow.getApp().getContent().copy();
	}
}

 

SaveAction.java

//SaveAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.MessageBox;


public class SaveAction extends Action{
	public SaveAction(){
		super();
		setText("保存(&S)");
		setToolTipText("保存文件");
		
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\save.gif"));
	}
	
	public void run(){
		final FileManager fileManager = MainWindow.getApp().getManager();
		if(!fileManager.isDirty())
			return;
		if(fileManager.getFileName()==null){
			FileDialog saveDialog = new FileDialog(MainWindow.getApp().getShell(), SWT.SAVE);
			saveDialog.setText("请选择所要保存的文件");
			saveDialog.setFilterPath("F:\\");
			saveDialog.setFilterExtensions(new String[]{"*.java","*.*"});
			String saveFile = saveDialog.open();
			if(saveFile != null){
				fileManager.setFileName(saveFile);
				fileManager.setContent(MainWindow.getApp().getContent().getText());
				fileManager.save(fileManager.getFileName());
			}
			fileManager.setDirty(false);
			return;
		}
		if(fileManager.getFileName()!=null){
			MessageBox box = new MessageBox(MainWindow.getApp().getShell(), SWT.ICON_QUESTION | SWT.YES| SWT.NO);
			box.setMessage("您确定要保存文件吗？");
			int choice = box.open();
			if(choice == SWT.NO)
				return;
			fileManager.setContent(MainWindow.getApp().getContent().getText());
			fileManager.save(fileManager.getFileName());
			fileManager.setDirty(false);
			return;
		}
	}
}

 

SaveAsAction.java

//SaveAsAction.java

import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;


public class SaveAsAction extends Action{
	public SaveAsAction(){
		super();
		setText("另存为(&A)");
		setToolTipText("另存为");
		setImageDescriptor(ImageDescriptor.createFromFile(NewAction.class, "icons\\saveas.gif"));
	}
	
	public void run(){
		final FileManager fileManager = MainWindow.getApp().getManager();
		FileDialog saveDialog = new FileDialog(MainWindow.getApp().getShell(), SWT.SAVE);
		saveDialog.setText("请选择所要保存的文件");
		saveDialog.setFilterPath("F:\\");
		saveDialog.setFilterExtensions(new String[]{"*.java","*.*"});
		String saveFile = saveDialog.open();
		if(saveFile !=null){
			fileManager.setFileName(saveFile);
			fileManager.setContent(MainWindow.getApp().getContent().getText());
			fileManager.save(fileManager.getFileName());
		}
		fileManager.setDirty(false);
		return;
	}
}

 

以上就是代码部分。

程序运行如下所示：

 

图标文件存储在项目 bin 目录下的 icons 目录下。所有图标文件都是从org.eclipse.ui_*.jar 中获取的。只是改了一下文件名。