SWT(JFace) 文本编辑器 实现代码
代码如下： 实现1： BasicEditor.java 复制代码 代码如下:package swt_jface.demo5; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.ImageRegistry; 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.graphics.Image; 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.Menu; import org.eclipse.swt.widgets.MenuItem; 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 BasicEditor { Display display = new Display(); Shell shell = new Shell(display); StyledText text; boolean hasUnsavedChanges; File file; private String lastOpenDirectory; public static final String APP_NAME = "BasicEditor v1.0"; MenuItem miWrap = null; public BasicEditor() { shell.setLayout(new GridLayout()); ToolBar toolBar = new ToolBar(shell, SWT.FLAT | SWT.RIGHT ); ToolItem tiNew = new ToolItem(toolBar, SWT.PUSH); tiNew.setText("&New"); tiNew.setImage(getImage("new.gif")); tiNew.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { if(handleChangesBeforeDiscard()) { file = null; text.setText(""); } } }); ToolItem tiOpen = new ToolItem(toolBar, SWT.PUSH); tiOpen.setText("&Open"); tiOpen.setImage(getImage("open.gif")); tiOpen.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { if(handleChangesBeforeDiscard()) loadTextFromFile(); } }); ToolItem tiSave = new ToolItem(toolBar, SWT.PUSH); tiSave.setText("&Save"); tiSave.setImage(getImage("save.gif")); tiSave.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { saveTextToFile(); } }); new ToolItem(toolBar, SWT.SEPARATOR); ToolItem tiCopy = new ToolItem(toolBar, SWT.PUSH); tiCopy.setText("&Copy"); tiCopy.setImage(getImage("copy.gif")); tiCopy.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.copy(); } }); ToolItem tiCut = new ToolItem(toolBar, SWT.PUSH); tiCut.setText("Cu&t"); tiCut.setImage(getImage("cut.gif")); tiCut.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.cut(); } }); ToolItem tiPaste = new ToolItem(toolBar, SWT.PUSH); tiPaste.setText("&Paste"); tiPaste.setImage(getImage("paste.gif")); tiPaste.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.paste(); } }); new ToolItem(toolBar, SWT.SEPARATOR); final ToolItem tiWrap = new ToolItem(toolBar, SWT.CHECK); tiWrap.setText("&Wrap"); tiWrap.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.setWordWrap(tiWrap.getSelection()); miWrap.setSelection(tiWrap.getSelection()); } }); toolBar.pack(); System.out.println("Client area: " + shell.getClientArea()); text = new StyledText( shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); text.setLayoutData(new GridData(GridData.FILL_BOTH)); Font font = new Font(shell.getDisplay(), "Courier New", 10, SWT.NORMAL); text.setFont(font); text.setText("BasicEditor version 1.0\r\nWriten by Jack Li Guojie. "); text.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { hasUnsavedChanges = true; } }); Menu menuBar = new Menu(shell, SWT.BAR); MenuItem fileMenuItem = new MenuItem(menuBar, SWT.CASCADE); fileMenuItem.setText("&File"); Menu fileMenu = new Menu(shell, SWT.DROP_DOWN); MenuItem miNew = new MenuItem(fileMenu, SWT.PUSH); miNew.setText("&New\tCtrl+N"); miNew.setImage(getImage("new.gif")); miNew.setAccelerator(SWT.CTRL + 'N'); miNew.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { if(handleChangesBeforeDiscard()) { file = null; text.setText(""); } } }); MenuItem miOpen = new MenuItem(fileMenu, SWT.PUSH); miOpen.setText("&Open\tCtrl+O"); miOpen.setAccelerator(SWT.CTRL + 'O'); miOpen.setImage(getImage("open.gif")); miOpen.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { if(handleChangesBeforeDiscard()) loadTextFromFile(); } }); MenuItem miSave = new MenuItem(fileMenu, SWT.PUSH); miSave.setText("&Save\tCtrl+S"); miSave.setImage(getImage("save.gif")); miSave.setAccelerator(SWT.CTRL + 'S'); miSave.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { saveTextToFile(); } }); new MenuItem(fileMenu, SWT.SEPARATOR); MenuItem miExit = new MenuItem(fileMenu, SWT.PUSH); miExit.setText("&Exit"); miExit.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { if(handleChangesBeforeDiscard()) shell.dispose(); } }); fileMenuItem.setMenu(fileMenu); MenuItem editMenuItem = new MenuItem(menuBar, SWT.CASCADE); editMenuItem.setText("&Edit"); Menu editMenu = new Menu(shell, SWT.DROP_DOWN); MenuItem miCopy = new MenuItem(editMenu, SWT.PUSH); miCopy.setText("&Copy\tCtrl+C"); miCopy.setImage(getImage("copy.gif")); miCopy.setAccelerator(SWT.CTRL + 'C'); miCopy.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.copy(); } }); MenuItem miCut = new MenuItem(editMenu, SWT.PUSH); miCut.setText("Cu&t\tCtrl+X"); miCut.setImage(getImage("cut.gif")); miCut.setAccelerator(SWT.CTRL + 'X'); miCut.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.cut(); } }); MenuItem miPaste = new MenuItem(editMenu, SWT.PUSH); miPaste.setText("&Paste\tCtrl+P"); miPaste.setImage(getImage("paste.gif")); miPaste.setAccelerator(SWT.CTRL + 'P'); miPaste.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.paste(); } }); editMenuItem.setMenu(editMenu); MenuItem formatMenuItem = new MenuItem(menuBar, SWT.CASCADE); formatMenuItem.setText("&Format"); Menu formatMenu = new Menu(shell, SWT.DROP_DOWN); miWrap = new MenuItem(formatMenu, SWT.CHECK); miWrap.setText("&Wrap\tCtrl+W"); miWrap.setAccelerator(SWT.CTRL + 'W'); miWrap.addListener(SWT.Selection, new Listener() { public void handleEvent(Event event) { text.setWordWrap(miWrap.getSelection()); tiWrap.setSelection(miWrap.getSelection()); } }); formatMenuItem.setMenu(formatMenu); shell.setMenuBar(menuBar); shell.setSize(400, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } ImageRegistry imageRegistry = new ImageRegistry(); private Image getImage(String shortFileName) { if(imageRegistry.getDescriptor(shortFileName) == null) { ImageDescriptor descriptor = ImageDescriptor.createFromFile(null, "C:/icons/" + shortFileName); imageRegistry.put(shortFileName, descriptor); } return imageRegistry.get(shortFileName); } boolean handleChangesBeforeDiscard() { if(! hasUnsavedChanges) return true; MessageBox messageBox = new MessageBox(shell, SWT.ICON_WARNING | SWT.YES | SWT.NO | SWT.CANCEL); messageBox.setMessage("Do you want to save the changes to " + (file == null ? "a file?" : file.getName())); messageBox.setText(APP_NAME); int ret = messageBox.open(); if(ret == SWT.YES) { return saveTextToFile(); }else if(ret == SWT.NO) { return true; }else{ return false; } } boolean loadTextFromFile() { FileDialog dialog = new FileDialog(shell, SWT.OPEN); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: loading the text from a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); try { BufferedReader reader = new BufferedReader(new FileReader(file)); StringBuffer sb = new StringBuffer(); String line = null; while((line = reader.readLine()) != null) { sb.append(line); sb.append("\r\n"); } text.setText(sb.toString()); return true; }catch(IOException e) { log("Failed to load the text from file: " + file); log(e.toString()); } return false; } boolean saveTextToFile() { if (file == null) { FileDialog dialog = new FileDialog(shell, SWT.SAVE); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: saving the text to a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); } try { FileWriter writer = new FileWriter(file); writer.write(text.getText()); writer.close(); log("The text has been saved to file: " + file); hasUnsavedChanges = false; return true; } catch (IOException e) { log("Failed to save the text to file: " + file); log(e.toString()); } return false; } void log(String message) { System.out.println(message); } public static void main(String[] args) { new BasicEditor(); } }实现2： BasicEditor2.java 复制代码 代码如下:package swt_jface.demo5; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.IAction; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.action.Separator; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.ImageRegistry; 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.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Decorations; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.ToolBar; public class BasicEditor2 { Display display = new Display(); Shell shell = new Shell(display); StyledText text; boolean hasUnsavedChanges; File file; private String lastOpenDirectory; public static final String APP_NAME = "BasicEditor v2.0"; MenuItem miWrap = null; public BasicEditor2() { Action actionNew = new Action( "&New", ImageDescriptor.createFromFile(null, "C:/icons/new.gif")) { public void run() { if (handleChangesBeforeDiscard()) { file = null; text.setText(""); } } }; actionNew.setAccelerator(SWT.CTRL + 'N'); Action actionOpen = new Action( "&Open", ImageDescriptor.createFromFile(null, "C:/icons/open.gif")) { public void run() { if (handleChangesBeforeDiscard()) loadTextFromFile(); } }; actionOpen.setAccelerator(SWT.CTRL + 'O'); Action actionSave = new Action( "&Save\tCtrl+S", ImageDescriptor.createFromFile(null, "C:/icons/save.gif")) { public void run() { saveTextToFile(); } }; //actionSave.setAccelerator(SWT.CTRL + 'S'); Action actionCopy = new Action( "&Copy", ImageDescriptor.createFromFile(null, "C:/icons/copy.gif")) { public void run() { text.copy(); } }; actionCopy.setAccelerator(SWT.CTRL + 'C'); Action actionCut = new Action( "Cu&t", ImageDescriptor.createFromFile(null, "C:/icons/cut.gif")) { public void run() { text.cut(); } }; actionCut.setAccelerator(SWT.CTRL + 'X'); Action actionPaste = new Action( "&Paste", ImageDescriptor.createFromFile(null, "C:/icons/paste.gif")) { public void run() { text.paste(); } }; actionPaste.setAccelerator(SWT.CTRL + 'P'); Action actionWrap = new Action( "&Wrap", IAction.AS_CHECK_BOX) { public void run() { text.setWordWrap(isChecked()); } }; actionWrap.setAccelerator(SWT.CTRL + 'W'); Action actionExit = new Action("&Exit@Ctrl+X") { public void run() { if (handleChangesBeforeDiscard()) shell.dispose(); } }; System.out.println(actionWrap.getText()); ToolBar toolBar = new ToolBar(shell, SWT.FLAT | SWT.RIGHT); ToolBarManager toolBarManager = new ToolBarManager(toolBar); toolBarManager.add(actionNew); toolBarManager.add(actionOpen); toolBarManager.add(actionSave); toolBarManager.add(new Separator()); toolBarManager.add(actionCopy); toolBarManager.add(actionCut); toolBarManager.add(actionPaste); toolBarManager.add(new Separator()); toolBarManager.add(actionWrap); toolBarManager.update(true); shell.setLayout(new GridLayout()); System.out.println("Client area: " + shell.getClientArea()); text = new StyledText(开发者_JAV培训 shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); text.setLayoutData(new GridData(GridData.FILL_BOTH)); Font font = new Font(shell.getDisplay(), "Courier New", 10, SWT.NORMAL); text.setFont(font); text.setText("BasicEditor version 1.0\r\nWriten by Jack Li Guojie. "); text.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { hasUnsavedChanges = true; } }); MenuManager barMenuManager = new MenuManager(); MenuManager fileMenuManager = new MenuManager("&File"); MenuManager editMenuManager = new MenuManager("&Edit"); MenuManager formatMenuManager = new MenuManager("&Format"); barMenuManager.add(fileMenuManager); barMenuManager.add(editMenuManager); barMenuManager.add(formatMenuManager); fileMenuManager.add(actionNew); fileMenuManager.add(actionOpen); fileMenuManager.add(actionSave); fileMenuManager.add(new Separator()); fileMenuManager.add(actionExit); editMenuManager.add(actionCopy); editMenuManager.add(actionCut); editMenuManager.add(actionPaste); formatMenuManager.add(actionWrap); // shell.setMenuBar(menuBar); barMenuManager.updateAll(true); shell.setMenuBar(barMenuManager.createMenuBar((Decorations)shell)); shell.setSize(400, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } ImageRegistry imageRegistry = new ImageRegistry(); private Image getImage(String shortFileName) { if (imageRegistry.getDescriptor(shortFileName) == null) { ImageDescriptor descriptor = ImageDescriptor.createFromFile(null, "C:/icons/" + shortFileName); imageRegistry.put(shortFileName, descriptor); } return imageRegistry.get(shortFileName); } boolean handleChangesBeforeDiscard() { if (!hasUnsavedChanges) return true; MessageBox messageBox = new MessageBox( shell, SWT.ICON_WARNING | SWT.YES | SWT.NO | SWT.CANCEL); messageBox.setMessage( "Do you want to save the changes to " + (file == null ? "a file?" : file.getName())); messageBox.setText(APP_NAME); int ret = messageBox.open(); if (ret == SWT.YES) { return saveTextToFile(); } else if (ret == SWT.NO) { return true; } else { return false; } } boolean loadTextFromFile() { FileDialog dialog = new FileDialog(shell, SWT.OPEN); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: loading the text from a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); try { BufferedReader reader = new BufferedReader(new FileReader(file)); StringBuffer sb = new StringBuffer(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line); sb.append("\r\n"); } text.setText(sb.toString()); return true; } catch (IOException e) { log("Failed to load the text from file: " + file); log(e.toString()); } return false; } boolean saveTextToFile() { if (file == null) { FileDialog dialog = new FileDialog(shell, SWT.SAVE); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: saving the text to a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); } try { FileWriter writer = new FileWriter(file); writer.write(text.getText()); writer.close(); log("The text has been saved to file: " + file); hasUnsavedChanges = false; return true; } catch (IOException e) { log("Failed to save the text to file: " + file); log(e.toString()); } return false; } void log(String message) { System.out.println(message); } public static void main(String[] args) { new BasicEditor2(); } }实现3： BasicEditor3.java 复制代码 代码如下:package swt_jface.demo11; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.IAction; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.action.Separator; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.ImageRegistry; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.custom.StyledTextPrintOptions; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.printing.PrintDialog; import org.eclipse.swt.printing.Printer; import org.eclipse.swt.printing.PrinterData; import org.eclipse.swt.widgets.Decorations; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.MenuItem; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.ToolBar; public class BasicEditor3 { Display display = new Display(); Shell shell = new Shell(display); StyledText text; boolean hasUnsavedChanges; File file; private String lastOpenDirectory; public static final String APP_NAME = "BasicEditor v3.0"; MenuItem miWrap = null; public BasicEditor3() { Action actionNew = new Action( "&New", ImageDescriptor.createFromFile(null, "C:/icons/new.gif")) { public void run() { if (handleChangesBeforeDiscard()) { file = null; text.setText(""); } } }; actionNew.setAccelerator(SWT.CTRL + 'N'); Action actionOpen = new Action( "&Open", ImageDescriptor.createFromFile(null, "C:/icons/open.gif")) { public void run() { if (handleChangesBeforeDiscard()) loadTextFromFile(); } }; actionOpen.setAccelerator(SWT.CTRL + 'O'); Action actionSave = new Action( "&Save\tCtrl+S", ImageDescriptor.createFromFile(null, "C:/icons/save.gif")) { public void run() { saveTextToFile(); } }; actionSave.setAccelerator(SWT.CTRL + 'S'); Action actionCopy = new Action( "&Copy", &nbs编程客栈p; ImageDescriptor.createFromFile(null, "C:/icons/copy.gif")) { public void run() { text.copy(); } }; actionCopy.setAccelerator(SWT.CTRL + 'C'); Action actionCut = new Action( "Cu&t", ImageDescriptor.createFromFile(null, "C:/icons/cut.gif")) { public void run() { text编程客栈.cut(); } }; actionCut.setAccelerator(SWT.CTRL + 'X'); Action actionPaste = new Action( "&Paste", ImageDescriptor.createFromFile(null, "C:/icons/paste.gif")) { public void run() { text.paste(); } }; actionPaste.setAccelerator(SWT.CTRL + 'P'); Action actionWrap = new Action( "&Wrap", IAction.AS_CHECK_BOX) { public void run() { text.setWordWrap(isChecked()); } }; actionWrap.setAccelerator(SWT.CTRL + 'W'); Action actionExit = new Action("&Exit@Ctrl+X") { public void run() { if (handleChangesBeforeDiscard()) shell.dispose(); } }; Action actionPrint = new Action("&Print@Ctrl+P") { public void run() { printText(text.getText()); } }; Action actionPrint2 = new Action("Print (StyledText)") { public void run() { StyledTextPrintOptions options = new StyledTextPrintOptions(); options.header = "SWT"; options.footer = "Page <page>"; options.jobName = "Text"; Runnable runnable = text.print(new Printer(), options); runnable.run(); } }; ToolBar toolBar = new ToolBar(shell, SWT.FLAT | SWT.RIGHT); ToolBarManager toolBarManager = new ToolBarManager(toolBar); toolBarManager.add(actionNew); 编程客栈 toolBarManager.add(actionOpen); toolBarManager.add(actionSave); toolBarManager.add(new Separator()); toolBarManager.add(actionCopy); toolBarManager.add(actionCut); toolBarManager.add(actionPaste); toolBarManager.add(new Separator()); toolBarManager.add(actionWrap); toolBarManager.add(new Separator()); toolBarManager.add(actionPrint); toolBarManager.add(actionPrint2); toolBarManager.update(true); shell.setText(APP_NAME); shell.setLayout(new GridLayout()); text = new StyledText( shell, SWT.MULTI | SWT.WRAP | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); text.setLayoutData(new GridData(GridData.FILL_BOTH)); Font font = new Font(shell.getDisplay(), "Courier New", 10, SWT.NORMAL); text.setFont(font); text.setText("BasicEditor version 3.0\r\nWriten by Jack Li Guojie. "); text.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { hasUnsavedChanges = true; } }); MenuManager barMenuManager = new MenuManager(); MenuManager fileMenuManager = new MenuManager("&File"); MenuManager editMenuManager = new MenuManager("&Edit"); MenuManager formatMenuManager = new MenuManager("&Format"); barMenuManager.add(fileMenuManager); barMenuManager.add(editMenuManager); barMenuManager.add(formatMenuManager); fileMenuManager.add(actionNew); fileMenuManager.add(actionOpen); fileMenuManager.add(actionSave); fileMenuManager.add(actionPrint); fileMenuManager.add(new Separator()); fileMenuManager.add(actionExit); editMenuManager.add(actionCopy); editMenuManager.add(actionCut); editMenuManager.add(actionPaste); formatMenuManager.add(actionWrap); //shell.setMenuBar(menuBar); barMenuManager.updateAll(true); shell.setMenuBar(barMenuManager.createMenuBar((Decorations)shell)); shell.setSize(400, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } int x; int y; int lineHeight; PrintMargin margins; int pageNumber = 1; int lineNumber = 1; void printText(String text) { PrintDialog dialog = new PrintDialog(shell); PrinterData printerData = dialog.open(); if(printerData == null) return; Printer printer = new Printer(printerData); if(! printer.startJob("text")) return; GC gc = new GC(printer); margins = PrintMargin.getPrintMargin(printer, 1.0); x = margins.left; y = margins.top; StringBuffer buffer = new StringBuffer(); Font font = new Font(printer, "Arial", 12, SWT.NORMAL); gc.setFont(font); lineHeight = gc.getFontMetrics().getHeight(); printer.startPage(); String page = "- " + pageNumber + " -"; gc.drawString(page, (margins.right - margins.left - gc.textExtent(page).x) / 2 + margins.left, margins.bottom + gc.textExtent(page).y); for(int index = 0; index <text.length();) { char c = text.charAt(index); switch(c) { case '\r': if(index < text.length() - 1 && text.charAt(index + 1) == '\n') { printNewLine(printer, gc, buffer.toString()); buffer.setLength(0); index += 2; } break; case '\t': case ' ': if(gc.textExtent(buffer.toString() + ' ').x > margins.right - margins.left) { printNewLine(printer, gc, buffer.toString()); buffer.setLength(0); } buffer.append(c); if(index < text.length() - 1 && (!Character.isWhitespace(text.charAt(index + 1)))) { // Looks up one word to see whether the line should wraps here. String word = readWord(text, index + 1); if(gc.textExtent(buffer.toString() + word).x > margins.right - margins.left) { printNewLine(printer, gc, buffer.toString()); buffer.setLength(0); } } index += 1; break; default: buffer.append(c); index += 1; } } if(buffer.length() > 0) printNewLine(printer, gc, buffer.toString()); if(y + lineHeight <= margins.bottom) printer.endPage(); printer.endJob(); gc.dispose(); font.dispose(); printer.dispose(); } void printNewLine(Printer printer, GC gc, String line) { if(y + lineHeight > margins.bottom) { printer.endPage(); x = margins.left; y = margins.top; pageNumber ++; lineNumber = 1; String page = "- " + pageNumber + " -"; gc.drawString(page, (margins.right - margins.left - gc.textExtent(page).x) / 2 + margins.left, margins.bottom + gc.textExtent(page).y); } gc.drawString(line, x, y); y += lineHeight; } String readWord(String text, int offset) { StringBuffer sb = new StringBuffer(); int index = offset; char c = 0; while(index < text.length()) { c = text.charAt(index); if(Character.isWhitespace(c)) break; sb.append(c); index += 1; } return sb.toString(); } ImageRegistry imageRegistry = new ImageRegistry(); // private Image getImage(String shortFileName) { // if (imageRegistry.getDescriptor(shortFileName) == null) { // ImageDescriptor descriptor = // ImageDescriptor.createFromFile(null, "C:/icons/" + shortFileName); // imageRegistry.put(shortFileName, descriptor); // } // return imageRegistry.get(shortFileName); // } boolean handleChangesBeforeDiscard() { if (!hasUnsavedChanges) return true; &n编程客栈bsp; MessageBox messageBox = new MessageBox( shell, SWT.ICON_WARNING | SWT.YES | SWT.NO | SWT.CANCEL); messageBox.setMessage( "Do you want to save the changes to " + (file == null ? "a file?" : file.getName())); messageBox.setText(APP_NAME); int ret = messageBox.open(); if (ret == SWT.YES) { return saveTextToFile(); } else if (ret == SWT.NO) { return true; } else { return false; } } boolean loadTextFromFile() { FileDialog dialog = new FileDialog(shell, SWT.OPEN); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: loading the text from a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); try { BufferedReader reader = new BufferedReader(new FileReader(file)); StringBuffer sb = new StringBuffer(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line); sb.append("\r\n"); } text.setText(sb.toString()); return true; } catch (IOException e) { log("Failed to load the text from file: " + file); log(e.toString()); } return false; } boolean saveTextToFile() { if (file == null) { FileDialog dialog = new FileDialog(shell, SWT.SAVE); if (lastOpenDirectory != null) dialog.setFilterPath(lastOpenDirectory); String selectedFile = dialog.open(); if (selectedFile == null) { log("Action cancelled: saving the text to a file"); return false; } file = new File(selectedFile); lastOpenDirectory = file.getParent(); } try { FileWriter writer = new FileWriter(file); writer.write(text.getText()); writer.close(); log("The text has been saved to file: " + file); hasUnsavedChanges = false; return true; } catch (IOException e) { log("Failed to save the text to file: " + file); log(e.toString()); } return false; } void log(String message) { System.out.println(message); } public static void main(String[] args) { new BasicEditor3(); } }追加了打印机能，需要下面这个类：复制代码 代码如下:package swt_jface.demo11; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.printing.Printer; public class PrintMargin { public int left; public int right; public int top; public int bottom; private PrintMargin(int left, int right, int top, int bottom) { this.left = left; this.right = right; this.top = top; this.bottom = bottom; } static PrintMargin getPrintMargin(Printer printer, double margin) { return getPrintMargin(printer, margin, margin, margin, margin); } static PrintMargin getPrintMargin( Printer printer, double marginLeft, double marginRight, double marginTop, double marginBottom) { Rectangle clientArea = printer.getClientArea(); Rectangle trim = printer.computeTrim(0, 0, 0, 0); Point dpi = printer.getDPI(); int leftMargin = (int) (marginLeft * dpi.x) - trim.x; int rightMargin = clientArea.width + trim.width - (int) (marginRight * dpi.x) - trim.x; int topMargin = (int) (marginTop * dpi.y) - trim.y; int bottomMargin = clientArea.height + trim.height - (int) (marginBottom * dpi.y) - trim.y; 编程客栈; return new PrintMargin( leftMargin, rightMargin, topMargin, bottomMargin); } public String toString() { return "Margin { " + left + ", " + right + "; " + top + ", " + bottom + " }"; } }
加载中,请稍侯......
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