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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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.javaimport 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。