imageanalyzer.java

很好的学习swt的 sample 很好的学习swt的 sample

package org.eclipse.swt.examples.imageanalyzer;

/*
 * Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 * This file is made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 */

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.printing.*;
import org.eclipse.swt.custom.*;
import java.util.*;
import java.net.*;
import java.io.*;
import java.text.MessageFormat;

public class ImageAnalyzer {
	static ResourceBundle bundle = ResourceBundle.getBundle("examples_images");
	Display display;
	Shell shell;
	Canvas imageCanvas, paletteCanvas;
	Label typeLabel, sizeLabel, depthLabel, transparentPixelLabel,
		timeToLoadLabel, screenSizeLabel, backgroundPixelLabel,
		locationLabel, disposalMethodLabel, delayTimeLabel,
		repeatCountLabel, paletteLabel, dataLabel, statusLabel;
	Combo backgroundCombo, scaleXCombo, scaleYCombo, alphaCombo;
	Button incrementalCheck, transparentCheck, maskCheck, backgroundCheck;
	Button previousButton, nextButton, animateButton;
	StyledText dataText;
	Sash sash;
	Color whiteColor, blackColor, redColor, greenColor, blueColor, canvasBackground;
	Font fixedWidthFont;
	Cursor crossCursor;
	GC imageCanvasGC;
	
	int paletteWidth = 140; // recalculated and used as a width hint
	int ix = 0, iy = 0, py = 0; // used to scroll the image and palette
	float xscale = 1, yscale = 1; // used to scale the image
	int alpha = 255; // used to modify the alpha value of the image
	boolean incremental = false; // used to incrementally display an image
	boolean transparent = true; // used to display an image with transparency
	boolean showMask = false; // used to display an icon mask or transparent image mask
	boolean showBackground = false; // used to display the background of an animated image
	boolean animate = false; // used to animate a multi-image file
	Thread animateThread; // draws animated images
	Thread incrementalThread; // draws incremental images
	String lastPath; // used to seed the file dialog
	String currentName; // the current image file or URL name
	String fileName; // the current image file
	ImageLoader loader; // the loader for the current image file
	ImageData[] imageDataArray; // all image data read from the current file
	int imageDataIndex; // the index of the current image data
	ImageData imageData; // the currently-displayed image data
	Image image; // the currently-displayed image
	Vector incrementalEvents; // incremental image events
	long loadTime = 0; // the time it took to load the current image
	
	static final int INDEX_DIGITS = 4;
	static final int ALPHA_CONSTANT = 0;
	static final int ALPHA_X = 1;
	static final int ALPHA_Y = 2;

	class TextPrompter extends Dialog {
		String message = "";
		String result = null;
		Shell dialog;
		Text text;
		public TextPrompter (Shell parent, int style) {
			super (parent, style);
		}
		public TextPrompter (Shell parent) {
			this (parent, SWT.APPLICATION_MODAL);
		}
		public String getMessage () {
			return message;
		}
		public void setMessage (String string) {
			message = string;
		}
		public String open () {
			dialog = new Shell(getParent(), getStyle());
			dialog.setText(getText());
			dialog.setLayout(new GridLayout());
			Label label = new Label(dialog, SWT.NULL);
			label.setText(message);
			label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
			text = new Text(dialog, SWT.SINGLE | SWT.BORDER);
			GridData data = new GridData(GridData.FILL_HORIZONTAL);
			data.widthHint = 300;
			text.setLayoutData(data);
			Composite buttons = new Composite(dialog, SWT.NONE);
			GridLayout grid = new GridLayout();
			grid.numColumns = 2;
			buttons.setLayout(grid);
			buttons.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
			Button ok = new Button(buttons, SWT.PUSH);
			ok.setText(bundle.getString("OK"));
			data = new GridData();
			data.widthHint = 75;
			ok.setLayoutData(data);
			ok.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					result = text.getText();
					dialog.dispose();
				}
			});
			Button cancel = new Button(buttons, SWT.PUSH);
			cancel.setText(bundle.getString("Cancel"));
			data = new GridData();
			data.widthHint = 75;
			cancel.setLayoutData(data);
			cancel.addSelectionListener(new SelectionAdapter() {
				public void widgetSelected(SelectionEvent e) {
					dialog.dispose();
				}
			});
			dialog.setDefaultButton(ok);
			dialog.pack();
			dialog.open();
			while (!dialog.isDisposed()) {
				if (!display.readAndDispatch()) display.sleep();
			}
			return result;
		}
	}

	public static void main(String [] args) {
		Display display = new Display();
		ImageAnalyzer imageAnalyzer = new ImageAnalyzer();
		Shell shell = imageAnalyzer.open(display);
		
		while (!shell.isDisposed())
			if (!display.readAndDispatch()) display.sleep();
		display.dispose();
	}

	public Shell open(Display dpy) {
		// Create a window and set its title.
		this.display = dpy;
		shell = new Shell(display);
		shell.setText(bundle.getString("Image_analyzer"));
		
		// Hook resize and dispose listeners.
		shell.addControlListener(new ControlAdapter() {
			public void controlResized(ControlEvent event) {
				resizeShell(event);
			}
		});
		shell.addShellListener(new ShellAdapter() {
			public void shellClosed(ShellEvent e) {
				animate = false; // stop any animation in progress
				if (animateThread != null) {
					// wait for the thread to die before disposing the shell.
					while (animateThread.isAlive()) {
						if (!display.readAndDispatch()) display.sleep();
					}
				}
				e.doit = true;
			}
		});
		shell.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				// Clean up.
				if (image != null)
					image.dispose();
				whiteColor.dispose();
				blackColor.dispose();
				redColor.dispose();
				greenColor.dispose();
				blueColor.dispose();
				fixedWidthFont.dispose();
				crossCursor.dispose();
			}
		});

		// Create colors and fonts.
		whiteColor = new Color(display, 255, 255, 255);
		blackColor = new Color(display, 0, 0, 0);
		redColor = new Color(display, 255, 0, 0);
		greenColor = new Color(display, 0, 255, 0);
		blueColor = new Color(display, 0, 0, 255);
		fixedWidthFont = new Font(display, "courier", 10, 0);
		crossCursor = new Cursor(display, SWT.CURSOR_CROSS);
		
		// Add a menu bar and widgets.
		createMenuBar();
		createWidgets();
		shell.pack();
		
		// Create a GC for drawing, and hook the listener to dispose it.
		imageCanvasGC = new GC(imageCanvas);
		imageCanvas.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				imageCanvasGC.dispose();
			}
		});
		
		// Open the window
		shell.open();
		return shell;
	}

	void createWidgets() {
		// Add the widgets to the shell in a grid layout.
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.numColumns = 2;
		shell.setLayout(layout);

		// Separate the menu bar from the rest of the widgets.
		Label separator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
		GridData gridData = new GridData();
		gridData.horizontalSpan = 2;
		gridData.horizontalAlignment = GridData.FILL;
		separator.setLayoutData(gridData);
		
		// Add a composite to contain some control widgets across the top.
		Composite controls = new Composite(shell, SWT.NULL);
		RowLayout rowLayout = new RowLayout();
		rowLayout.marginTop = 0;
		rowLayout.marginBottom = 5;
		rowLayout.spacing = 8;
		controls.setLayout(rowLayout);
		gridData = new GridData();
		gridData.horizontalSpan = 2;
		controls.setLayoutData(gridData);
		
		// Combo to change the background.
		Group group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Background"));
		backgroundCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
		backgroundCombo.setItems(new String[] {
			bundle.getString("None"),
			bundle.getString("White"),
			bundle.getString("Black"),
			bundle.getString("Red"),
			bundle.getString("Green"),
			bundle.getString("Blue")});
		backgroundCombo.select(backgroundCombo.indexOf(bundle.getString("White")));
		backgroundCombo.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				changeBackground();
			}
		});
		
		// Combo to change the x scale.
		String[] values = {
			"0.1", "0.2", "0.3", "0.4", "0.5", "0.6", "0.7", "0.8", "0.9", "1",
			"1.1", "1.2", "1.3", "1.4", "1.5", "1.6", "1.7", "1.8", "1.9", "2",
			"3", "4", "5", "6", "7", "8", "9", "10",};
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("X_scale"));
		scaleXCombo = new Combo(group, SWT.DROP_DOWN);
		for (int i = 0; i < values.length; i++) {
			scaleXCombo.add(values[i]);
		}
		scaleXCombo.select(scaleXCombo.indexOf("1"));
		scaleXCombo.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				scaleX();
			}
		});
		
		// Combo to change the y scale.
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Y_scale"));
		scaleYCombo = new Combo(group, SWT.DROP_DOWN);
		for (int i = 0; i < values.length; i++) {
			scaleYCombo.add(values[i]);
		}
		scaleYCombo.select(scaleYCombo.indexOf("1"));
		scaleYCombo.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				scaleY();
			}
		});
		
		// Combo to change the alpha value.
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Alpha_K"));
		alphaCombo = new Combo(group, SWT.DROP_DOWN | SWT.READ_ONLY);
		for (int i = 0; i <= 255; i += 5) {
			alphaCombo.add(String.valueOf(i));
		}
		alphaCombo.select(alphaCombo.indexOf("255"));
		alphaCombo.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				alpha();
			}
		});
		
		// Check box to request incremental display.
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Display"));
		incrementalCheck = new Button(group, SWT.CHECK);
		incrementalCheck.setText(bundle.getString("Incremental"));
		incrementalCheck.setSelection(incremental);
		incrementalCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				incremental = ((Button)event.widget).getSelection();
			}
		});

		// Check box to request transparent display.
		transparentCheck = new Button(group, SWT.CHECK);
		transparentCheck.setText(bundle.getString("Transparent"));
		transparentCheck.setSelection(transparent);
		transparentCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				transparent = ((Button)event.widget).getSelection();
				if (image != null) {
					imageCanvas.redraw();
				}
			}
		});

		// Check box to request mask display.
		maskCheck = new Button(group, SWT.CHECK);
		maskCheck.setText(bundle.getString("Mask"));
		maskCheck.setSelection(showMask);
		maskCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				showMask = ((Button)event.widget).getSelection();
				if (image != null) {
					imageCanvas.redraw();
				}
			}
		});

		// Check box to request background display.
		backgroundCheck = new Button(group, SWT.CHECK);
		backgroundCheck.setText(bundle.getString("Background"));
		backgroundCheck.setSelection(showBackground);
		backgroundCheck.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				showBackground = ((Button)event.widget).getSelection();
			}
		});

		// Group the animation buttons.
		group = new Group(controls, SWT.NULL);
		group.setLayout(new RowLayout());
		group.setText(bundle.getString("Animation"));

		// Push button to display the previous image in a multi-image file.
		previousButton = new Button(group, SWT.PUSH);
		previousButton.setText(bundle.getString("Previous"));
		previousButton.setEnabled(false);
		previousButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				previous();
			}
		});

		// Push button to display the next image in a multi-image file.
		nextButton = new Button(group, SWT.PUSH);
		nextButton.setText(bundle.getString("Next"));
		nextButton.setEnabled(false);
		nextButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				next();
			}
		});

		// Push button to toggle animation of a multi-image file.
		animateButton = new Button(group, SWT.PUSH);
		animateButton.setText(bundle.getString("Animate"));
		animateButton.setEnabled(false);
		animateButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				animate();
			}
		});

		// Label to show the image file type.
		typeLabel = new Label(shell, SWT.NULL);
		typeLabel.setText(bundle.getString("Type_initial"));
		typeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));