texteditorexample.java

eclips swt jface 第四部分实例篇

				Point point = text.getSelectionRange();
				for (int i = point.x; i < point.x + point.y; i++) {
					// 获得选中的字体样式和范围
					range = text.getStyleRangeAtOffset(i);
					// 如果字体设置了其它样式(如加粗、斜体、加下划线)
					if (range != null) {
				 		/**
						 * 设置一个与原来StyleRange的值相同的StyleRange
						 */
						 style = (StyleRange) range.clone();
						 style.start = i;
						 style.length = 1;
						// 设置前景颜色
						 style.foreground = color;
					} else {
						
						style = new StyleRange(i, 1, color, null, SWT.NORMAL);
					}
					text.setStyleRange(style);
				}

			}
		}
	}

	class SelectAllAction extends Action {
		public SelectAllAction() {
			super("全选@Alt+A", Action.AS_PUSH_BUTTON);
		}

		public void run() {
			text.selectAll();
			
		}
	}

	class FormateAction extends Action {
		public FormateAction() {
			super("格式化@Ctrl+W", Action.AS_CHECK_BOX);
		}

		public void run() {
			text.setWordWrap(isChecked());
		}
	}

	class AboutAction extends Action {
		public AboutAction() {
			super("关于@Ctrl+H", Action.AS_PUSH_BUTTON);
		}

		public void run() {
			MessageBox messageBox = new MessageBox(getShell(),
					SWT.ICON_INFORMATION | SWT.OK);
			messageBox.setMessage("文本编辑器2.0版本！");
			messageBox.open();
		}
	}

	class BlodAction extends Action {
		public BlodAction() {
			setText("加粗");
			try {
				// 载入图像
				ImageDescriptor icon = ImageDescriptor.createFromURL(new URL(
						"file:icons/blod.bmp"));
				setImageDescriptor(icon);
			} catch (MalformedURLException e) {
				System.err.println(e.getMessage());
			}
		}

		public void run() {
			Point point= text.getSelectionRange();
			for (int i = point.x; i < point.x + point.y; i++) {
				StyleRange range = text.getStyleRangeAtOffset(i);
				if (range != null) {
					style = (StyleRange) range.clone();
					style.start = i;
					style.length = 1;
				} else {
					style = new StyleRange(i, 1, null, null, SWT.NORMAL);
				}
				
				//加粗字体
				style.fontStyle ^= SWT.BOLD;

				text.setStyleRange(style);

			}
		}

	}

	class ItalicAction extends Action {
		public ItalicAction() {
			setText("斜体");
			try {
				// 载入图像
				ImageDescriptor icon = ImageDescriptor.createFromURL(new URL(
						"file:icons/italic.bmp"));
				setImageDescriptor(icon);
			} catch (MalformedURLException e) {
				System.err.println(e.getMessage());
			}
		}

		public void run() {
			
			Point point = text.getSelectionRange();

			for (int i = point.x; i < point.x + point.y; i++) {
			   range = text.getStyleRangeAtOffset(i);
				if (range != null) {
				style = (StyleRange) range.clone();
					style.start = i;
					style.length = 1;
				} else {
					style = new StyleRange(i, 1, null, null, SWT.NORMAL);
				}
				//设置为斜体
				style.fontStyle ^= SWT.ITALIC;

				text.setStyleRange(style);

			}
		}

	}

	class UnderlineAction extends Action {
		public UnderlineAction() {
			setText("下划线");
			try {
				// 载入图像
				ImageDescriptor icon = ImageDescriptor.createFromURL(new URL(
						"file:icons/underline.bmp"));
				setImageDescriptor(icon);
			} catch (MalformedURLException e) {
				System.err.println(e.getMessage());
			}
		}

		public void run() {
			Point point = text.getSelectionRange();
			for (int i = point.x; i < point.x + point.y; i++) {
				 range = text.getStyleRangeAtOffset(i);
				if (range != null) {
					style = (StyleRange) range.clone();
					style.start = i;
					style.length = 1;
				} else {
					style = new StyleRange(i, 1, null, null, SWT.NORMAL);
				}
                //设置下划线
				style.underline = !style.underline;

				text.setStyleRange(style);

			}
		}

	}

	boolean judgeTextSave() {
		if (!changes)
			return true;
		MessageBox messageBox = new MessageBox(getShell(), SWT.ICON_WARNING
				| SWT.YES | SWT.NO | SWT.CANCEL);
		messageBox.setMessage("是否保存对文件的更改？");
		messageBox.setText("文本编辑器V2.0");
		int message = messageBox.open();
		if (message == SWT.YES) {
			return saveTextFile();
		} else if (message == SWT.NO) {
			return true;
		} else {
			return false;
		}
	}

	boolean OpenTextFile() {
		// 定义对话框，类型为打开型
		FileDialog dialog = new FileDialog(getShell(), SWT.OPEN);
		// 设置对话框打开的限定类型
		dialog.setFilterExtensions(new String[] { "*.txt", "*.*" });
		// 打开对话框，并返回打开文件的路径
		String openFile = dialog.open();
		if (openFile == null) {
			return false;
		}
		/**
		 * java.io包的File类专门处理文件，并获取文件相关信息。
		 * File类的构造方法： public File(String pathnames)
		 * 例如 ：File file=new(D:\my.java)
		 * public File(File parent,String child)
		 * 例如： File file=new(parent,"my.java")
		 * parent指文件所在目录的文件对象 
		 * public File(String parent,String child) 
		 * 例如:File file=new(dir,"my.java")
		 * dir指文件所在目录的字符串
		 */
		file = new File(openFile);
		try {
			/**
			 * FileReader文件字符流 
			 * 构造方法： public FileReader(File file)
			 * 例如：FileReader fileReade=new FileReader(file) 
			 * public FileReader(String filenames)
             * filenames为包含文件名的字符串
			 */
			FileReader fileReader = new FileReader(file);
			/**
			 * BufferedReader类用来把字符流的字符读入缓冲区
			 */
			BufferedReader reader = new BufferedReader(fileReader);
			/**
			 * 对Stringbuffer字符串缓冲实例化
			 */
			StringBuffer sb = new StringBuffer();
			String line = null;
			while ((line = reader.readLine()) != null) {
				/**
				 * 通过append()方法实现将字符串添加到字符缓冲区。 
				 * 也可以通过insert()方法将字符串插入缓冲区中
				 */
				sb.append(line);
				sb.append("\r\n");
			}
			text.setText(sb.toString());
			return true;
		} catch (IOException e) {
		}
		return false;
	}

	boolean saveTextFile() {
		if (file == null) {
			// 定义文件选择对话框，类型为保存型
			FileDialog dialog = new FileDialog(getShell(), SWT.SAVE);
			dialog.setText("保存");
			// 设置对话框保存的限定类型
			dialog.setFilterExtensions(new String[] { "*.txt", "*.doc",
					"*.xls", "*.*" });
			// 打开对话框，并返回保存文件的路径
			String saveFile = dialog.open();
			if (saveFile == null) {
				return false;
			}
			file = new File(saveFile);
		}
		try {
			FileWriter writer = new FileWriter(file);
			writer.write(text.getText());
			writer.close();
			changes = false;
			return true;
		} catch (IOException e) {
		}
		return false;
	}

	boolean saveFileAs() {
		SafeSaveDialog dlg = new SafeSaveDialog(getShell());
		String temp = dlg.open();
		if (temp == null) {
			return false;
		}
		file = new File(temp);
		try {
			FileWriter writer = new FileWriter(file);
			writer.write(text.getText());
			writer.close();
		} catch (IOException e) {
		}
		return false;
	}

	class SafeSaveDialog {
		private FileDialog dlg;

		public SafeSaveDialog(Shell shell) {
			dlg = new FileDialog(shell, SWT.SAVE);
			dlg.setFilterExtensions(new String[] { "*.txt", "*.doc", "*.xls",
					"*.*" });
		}

		public String open() {
			String fileName = null;
			boolean done = false;
			while (!done) {
				// 打开另存为对话框，并返回保存路径
				fileName = dlg.open();
				if (fileName == null) {
					done = true;
				} else {
					// 判断保存的文件是否已经存在
					File file = new File(fileName);
					if (file.exists()) {
						// 若文件存在，则弹出提示性的对话框
						MessageBox mb = new MessageBox(dlg.getParent(),
								SWT.ICON_WARNING | SWT.YES | SWT.NO);
						// 提示性的信息
						mb.setMessage(fileName + "已经存在，是否将该文件替换?");
						/**
						 * 单击“yes”按钮这将磁盘上的文件替换 
						 * 否则重新填写文件名
						 */
						done = mb.open() == SWT.YES;
					} else {
						done = true;
					}
				}
			}
			return fileName;
		}
	}

	public static void main(String[] args) {
		new TextEditorExample().run();
	}
}