examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet133.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.snippets;

 /*
  * Printing example snippet: print text to printer, with word wrap and pagination
  *
  * For a list of all SWT example snippets see
  * http://www.eclipse.org/swt/snippets/
  */
 import java.io.*;

 import org.eclipse.swt.*;
 import org.eclipse.swt.events.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.layout.*;
 import org.eclipse.swt.printing.*;
 import org.eclipse.swt.widgets.*;

 public class Snippet133 {
 	Display display;
 	Shell shell;
 	Text text;
 	Font font;
 	Color foregroundColor, backgroundColor;

 	Printer printer;
 	GC gc;
 	FontData[] printerFontData;
 	RGB printerForeground, printerBackground;

 	int lineHeight = 0;
 	int tabWidth = 0;
 	int leftMargin, rightMargin, topMargin, bottomMargin;
 	int x, y;
 	int index, end;
 	String textToPrint;
 	String tabs;
 	StringBuffer wordBuffer;

 	public static void main(String[] args) {
 		new Snippet133().open();
 	}

 	void open() {
 		display = new Display();
 		shell = new Shell(display);
 		shell.setLayout(new FillLayout());
 		shell.setText("Print Text");
 		text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL);

 		Menu menuBar = new Menu(shell, SWT.BAR);
 		shell.setMenuBar(menuBar);
 		MenuItem item = new MenuItem(menuBar, SWT.CASCADE);
 		item.setText("&File");
 		Menu fileMenu = new Menu(shell, SWT.DROP_DOWN);
 		item.setMenu(fileMenu);
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("&Open...");
 		item.setAccelerator(SWT.CTRL + 'O');
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				menuOpen();
 			}
 		});
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("Font...");
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				menuFont();
 			}
 		});
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("Foreground Color...");
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				menuForegroundColor();
 			}
 		});
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("Background Color...");
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				menuBackgroundColor();
 			}
 		});
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("&Print...");
 		item.setAccelerator(SWT.CTRL + 'P');
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				menuPrint();
 			}
 		});
 		new MenuItem(fileMenu, SWT.SEPARATOR);
 		item = new MenuItem(fileMenu, SWT.PUSH);
 		item.setText("E&xit");
 		item.addSelectionListener(new SelectionAdapter() {
 			@Override
 			public void widgetSelected(SelectionEvent event) {
 				System.exit(0);
 			}
 		});

 		shell.open();
 		while (!shell.isDisposed()) {
 			if (!display.readAndDispatch()) display.sleep();
 		}
 		if (font != null) font.dispose();
 		if (foregroundColor != null) foregroundColor.dispose();
 		if (backgroundColor != null) backgroundColor.dispose();
 		display.dispose();
 	}

 	void menuOpen() {
 		final String textString;
 		FileDialog dialog = new FileDialog(shell, SWT.OPEN);
 		dialog.setFilterExtensions(new String[] { "*.java", "*.*" });
 		String name = dialog.open();
 		if ((name == null) || (name.length() == 0))
 			return;

 		File file = new File(name);
 		try (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) {
 			MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
 			box.setMessage("File not found:\n" + name);
 			box.open();
 			return;
 		} catch (IOException e) {
 			MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
 			box.setMessage("Error reading file:\n" + name);
 			box.open();
 			return;
 		}

 		text.setText(textString);
 	}

 	void menuFont() {
 		FontDialog fontDialog = new FontDialog(shell);
 		fontDialog.setFontList(text.getFont().getFontData());
 		FontData fontData = fontDialog.open();
 		if (fontData != null) {
 			if (font != null) font.dispose();
 			font = new Font(display, fontData);
 			text.setFont(font);
 		}
 	}

 	void menuForegroundColor() {
 		ColorDialog colorDialog = new ColorDialog(shell);
 		colorDialog.setRGB(text.getForeground().getRGB());
 		RGB rgb = colorDialog.open();
 		if (rgb != null) {
 			if (foregroundColor != null) foregroundColor.dispose();
 			foregroundColor = new Color(display, rgb);
 			text.setForeground(foregroundColor);
 		}
 	}

 	void menuBackgroundColor() {
 		ColorDialog colorDialog = new ColorDialog(shell);
 		colorDialog.setRGB(text.getBackground().getRGB());
 		RGB rgb = colorDialog.open();
 		if (rgb != null) {
 			if (backgroundColor != null) backgroundColor.dispose();
 			backgroundColor = new Color(display, rgb);
 			text.setBackground(backgroundColor);
 		}
 	}

 	void menuPrint() {
 		PrintDialog dialog = new PrintDialog(shell, SWT.NONE);
 		PrinterData data = dialog.open();
 		if (data == null) return;
 		if (data.printToFile) {
 			data.fileName = "print.out"; // you probably want to ask the user for a filename
 		}

 		/* Get the text to print from the Text widget (you could get it from anywhere, i.e. your java model) */
 		textToPrint = text.getText();

 		/* Get the font & foreground & background data. */
 		printerFontData = text.getFont().getFontData();
 		printerForeground = text.getForeground().getRGB();
 		printerBackground = text.getBackground().getRGB();

 		/* Do the printing in a background thread so that spooling does not freeze the UI. */
 		printer = new Printer(data);
 		Thread printingThread = new Thread("Printing") {
 			@Override
 			public void run() {
 				print(printer);
 				printer.dispose();
 			}
 		};
 		printingThread.start();
 	}

 	void print(Printer printer) {
 		if (printer.startJob("Text")) {   // the string is the job name - shows up in the printer's job list
 			Rectangle clientArea = printer.getClientArea();
 			Rectangle trim = printer.computeTrim(0, 0, 0, 0);
 			Point dpi = printer.getDPI();
 			leftMargin = dpi.x + trim.x; // one inch from left side of paper
 			rightMargin = clientArea.width - dpi.x + trim.x + trim.width; // one inch from right side of paper
 			topMargin = dpi.y + trim.y; // one inch from top edge of paper
 			bottomMargin = clientArea.height - dpi.y + trim.y + trim.height; // one inch from bottom edge of paper

 			/* Create a buffer for computing tab width. */
 			int tabSize = 4; // is tab width a user setting in your UI?
 			StringBuffer tabBuffer = new StringBuffer(tabSize);
 			for (int i = 0; i < tabSize; i++) tabBuffer.append(' ');
 			tabs = tabBuffer.toString();

 			/* Create printer GC, and create and set the printer font & foreground color. */
 			gc = new GC(printer);
 			Font printerFont = new Font(printer, printerFontData);
 			Color printerForegroundColor = new Color(printer, printerForeground);
 			Color printerBackgroundColor = new Color(printer, printerBackground);

 			gc.setFont(printerFont);
 			gc.setForeground(printerForegroundColor);
 			gc.setBackground(printerBackgroundColor);
 			tabWidth = gc.stringExtent(tabs).x;
 			lineHeight = gc.getFontMetrics().getHeight();

 			/* Print text to current gc using word wrap */
 			printText();
 			printer.endJob();

 			/* Cleanup graphics resources used in printing */
 			printerFont.dispose();
 			printerForegroundColor.dispose();
 			printerBackgroundColor.dispose();
 			gc.dispose();
 		}
 	}

 	void printText() {
 		printer.startPage();
 		wordBuffer = new StringBuffer();
 		x = leftMargin;
 		y = topMargin;
 		index = 0;
 		end = textToPrint.length();
 		while (index < end) {
 			char c = textToPrint.charAt(index);
 			index++;
 			if (c != 0) {
 				if (c == 0x0a || c == 0x0d) {
 					if (c == 0x0d && index < end && textToPrint.charAt(index) == 0x0a) {
 						index++; // if this is cr-lf, skip the lf
 					}
 					printWordBuffer();
 					newline();
 				} else {
 					if (c != '\t') {
 						wordBuffer.append(c);
 					}
 					if (Character.isWhitespace(c)) {
 						printWordBuffer();
 						if (c == '\t') {
 							x += tabWidth;
 						}
 					}
 				}
 			}
 		}
 		if (y + lineHeight <= bottomMargin) {
 			printer.endPage();
 		}
 	}

 	void printWordBuffer() {
 		if (wordBuffer.length() > 0) {
 			String word = wordBuffer.toString();
 			int wordWidth = gc.stringExtent(word).x;
 			if (x + wordWidth > rightMargin) {
 				/* word doesn't fit on current line, so wrap */
 				newline();
 			}
 			gc.drawString(word, x, y, false);
 			x += wordWidth;
 			wordBuffer = new StringBuffer();
 		}
 	}

 	void newline() {
 		x = leftMargin;
 		y += lineHeight;
 		if (y + lineHeight > bottomMargin) {
 			printer.endPage();
 			if (index + 1 < end) {
 				y = topMargin;
 				printer.startPage();
 			}
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2004 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.snippets;

	/*
	* Printing example snippet: print text to printer, with word wrap and pagination
	*
	* For a list of all SWT example snippets see
	* http://www.eclipse.org/swt/snippets/
	*/
	import java.io.*;

	import org.eclipse.swt.*;
	import org.eclipse.swt.events.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.layout.*;
	import org.eclipse.swt.printing.*;
	import org.eclipse.swt.widgets.*;

	public class Snippet133 {
	Display display;
	Shell shell;
	Text text;
	Font font;
	Color foregroundColor, backgroundColor;

	Printer printer;
	GC gc;
	FontData[] printerFontData;
	RGB printerForeground, printerBackground;

	int lineHeight = 0;
	int tabWidth = 0;
	int leftMargin, rightMargin, topMargin, bottomMargin;
	int x, y;
	int index, end;
	String textToPrint;
	String tabs;
	StringBuffer wordBuffer;

	public static void main(String[] args) {
	new Snippet133().open();
	}

	void open() {
	display = new Display();
	shell = new Shell(display);
	shell.setLayout(new FillLayout());
	shell.setText("Print Text");
	text = new Text(shell, SWT.BORDER \| SWT.MULTI \| SWT.V_SCROLL \| SWT.H_SCROLL);

	Menu menuBar = new Menu(shell, SWT.BAR);
	shell.setMenuBar(menuBar);
	MenuItem item = new MenuItem(menuBar, SWT.CASCADE);
	item.setText("&File");
	Menu fileMenu = new Menu(shell, SWT.DROP_DOWN);
	item.setMenu(fileMenu);
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("&Open...");
	item.setAccelerator(SWT.CTRL + 'O');
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	menuOpen();
	}
	});
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("Font...");
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	menuFont();
	}
	});
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("Foreground Color...");
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	menuForegroundColor();
	}
	});
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("Background Color...");
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	menuBackgroundColor();
	}
	});
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("&Print...");
	item.setAccelerator(SWT.CTRL + 'P');
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	menuPrint();
	}
	});
	new MenuItem(fileMenu, SWT.SEPARATOR);
	item = new MenuItem(fileMenu, SWT.PUSH);
	item.setText("E&xit");
	item.addSelectionListener(new SelectionAdapter() {
	@Override
	public void widgetSelected(SelectionEvent event) {
	System.exit(0);
	}
	});

	shell.open();
	while (!shell.isDisposed()) {
	if (!display.readAndDispatch()) display.sleep();
	}
	if (font != null) font.dispose();
	if (foregroundColor != null) foregroundColor.dispose();
	if (backgroundColor != null) backgroundColor.dispose();
	display.dispose();
	}

	void menuOpen() {
	final String textString;
	FileDialog dialog = new FileDialog(shell, SWT.OPEN);
	dialog.setFilterExtensions(new String[] { ".java", ".*" });
	String name = dialog.open();
	if ((name == null) \|\| (name.length() == 0))
	return;

	File file = new File(name);
	try (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) {
	MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
	box.setMessage("File not found:\n" + name);
	box.open();
	return;
	} catch (IOException e) {
	MessageBox box = new MessageBox(shell, SWT.ICON_ERROR);
	box.setMessage("Error reading file:\n" + name);
	box.open();
	return;
	}

	text.setText(textString);
	}

	void menuFont() {
	FontDialog fontDialog = new FontDialog(shell);
	fontDialog.setFontList(text.getFont().getFontData());
	FontData fontData = fontDialog.open();
	if (fontData != null) {
	if (font != null) font.dispose();
	font = new Font(display, fontData);
	text.setFont(font);
	}
	}

	void menuForegroundColor() {
	ColorDialog colorDialog = new ColorDialog(shell);
	colorDialog.setRGB(text.getForeground().getRGB());
	RGB rgb = colorDialog.open();
	if (rgb != null) {
	if (foregroundColor != null) foregroundColor.dispose();
	foregroundColor = new Color(display, rgb);
	text.setForeground(foregroundColor);
	}
	}

	void menuBackgroundColor() {
	ColorDialog colorDialog = new ColorDialog(shell);
	colorDialog.setRGB(text.getBackground().getRGB());
	RGB rgb = colorDialog.open();
	if (rgb != null) {
	if (backgroundColor != null) backgroundColor.dispose();
	backgroundColor = new Color(display, rgb);
	text.setBackground(backgroundColor);
	}
	}

	void menuPrint() {
	PrintDialog dialog = new PrintDialog(shell, SWT.NONE);
	PrinterData data = dialog.open();
	if (data == null) return;
	if (data.printToFile) {
	data.fileName = "print.out"; // you probably want to ask the user for a filename
	}

	/* Get the text to print from the Text widget (you could get it from anywhere, i.e. your java model) */
	textToPrint = text.getText();

	/* Get the font & foreground & background data. */
	printerFontData = text.getFont().getFontData();
	printerForeground = text.getForeground().getRGB();
	printerBackground = text.getBackground().getRGB();

	/* Do the printing in a background thread so that spooling does not freeze the UI. */
	printer = new Printer(data);
	Thread printingThread = new Thread("Printing") {
	@Override
	public void run() {
	print(printer);
	printer.dispose();
	}
	};
	printingThread.start();
	}

	void print(Printer printer) {
	if (printer.startJob("Text")) { // the string is the job name - shows up in the printer's job list
	Rectangle clientArea = printer.getClientArea();
	Rectangle trim = printer.computeTrim(0, 0, 0, 0);
	Point dpi = printer.getDPI();
	leftMargin = dpi.x + trim.x; // one inch from left side of paper
	rightMargin = clientArea.width - dpi.x + trim.x + trim.width; // one inch from right side of paper
	topMargin = dpi.y + trim.y; // one inch from top edge of paper
	bottomMargin = clientArea.height - dpi.y + trim.y + trim.height; // one inch from bottom edge of paper

	/* Create a buffer for computing tab width. */
	int tabSize = 4; // is tab width a user setting in your UI?
	StringBuffer tabBuffer = new StringBuffer(tabSize);
	for (int i = 0; i < tabSize; i++) tabBuffer.append(' ');
	tabs = tabBuffer.toString();

	/* Create printer GC, and create and set the printer font & foreground color. */
	gc = new GC(printer);
	Font printerFont = new Font(printer, printerFontData);
	Color printerForegroundColor = new Color(printer, printerForeground);
	Color printerBackgroundColor = new Color(printer, printerBackground);

	gc.setFont(printerFont);
	gc.setForeground(printerForegroundColor);
	gc.setBackground(printerBackgroundColor);
	tabWidth = gc.stringExtent(tabs).x;
	lineHeight = gc.getFontMetrics().getHeight();

	/* Print text to current gc using word wrap */
	printText();
	printer.endJob();

	/* Cleanup graphics resources used in printing */
	printerFont.dispose();
	printerForegroundColor.dispose();
	printerBackgroundColor.dispose();
	gc.dispose();
	}
	}

	void printText() {
	printer.startPage();
	wordBuffer = new StringBuffer();
	x = leftMargin;
	y = topMargin;
	index = 0;
	end = textToPrint.length();
	while (index < end) {
	char c = textToPrint.charAt(index);
	index++;
	if (c != 0) {
	if (c == 0x0a \|\| c == 0x0d) {
	if (c == 0x0d && index < end && textToPrint.charAt(index) == 0x0a) {
	index++; // if this is cr-lf, skip the lf
	}
	printWordBuffer();
	newline();
	} else {
	if (c != '\t') {
	wordBuffer.append(c);
	}
	if (Character.isWhitespace(c)) {
	printWordBuffer();
	if (c == '\t') {
	x += tabWidth;
	}
	}
	}
	}
	}
	if (y + lineHeight <= bottomMargin) {
	printer.endPage();
	}
	}

	void printWordBuffer() {
	if (wordBuffer.length() > 0) {
	String word = wordBuffer.toString();
	int wordWidth = gc.stringExtent(word).x;
	if (x + wordWidth > rightMargin) {
	/* word doesn't fit on current line, so wrap */
	newline();
	}
	gc.drawString(word, x, y, false);
	x += wordWidth;
	wordBuffer = new StringBuffer();
	}
	}

	void newline() {
	x = leftMargin;
	y += lineHeight;
	if (y + lineHeight > bottomMargin) {
	printer.endPage();
	if (index + 1 < end) {
	y = topMargin;
	printer.startPage();
	}
	}
	}
	}