imageanalyzer.java

很好的学习swt的 sample 很好的学习swt的 sample

		// Canvas to show the image.
		imageCanvas = new Canvas(shell, SWT.V_SCROLL | SWT.H_SCROLL | SWT.NO_REDRAW_RESIZE);
		imageCanvas.setBackground(whiteColor);
		imageCanvas.setCursor(crossCursor);
		gridData = new GridData();
		gridData.verticalSpan = 15;
		gridData.horizontalAlignment = GridData.FILL;
		gridData.verticalAlignment = GridData.FILL;
		gridData.grabExcessHorizontalSpace = true;
		gridData.grabExcessVerticalSpace = true;
		imageCanvas.setLayoutData(gridData);
		imageCanvas.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent event) {
				if (image != null)
					paintImage(event);
			}
		});
		imageCanvas.addMouseMoveListener(new MouseMoveListener() {
			public void mouseMove(MouseEvent event) {
				if (image != null) {
					showColorAt(event.x, event.y);
				}
			}
		});

		// Set up the image canvas scroll bars.
		ScrollBar horizontal = imageCanvas.getHorizontalBar();
		horizontal.setVisible(true);
		horizontal.setMinimum(0);
		horizontal.setEnabled(false);
		horizontal.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				scrollHorizontally((ScrollBar)event.widget);
			}
		});
		ScrollBar vertical = imageCanvas.getVerticalBar();
		vertical.setVisible(true);
		vertical.setMinimum(0);
		vertical.setEnabled(false);
		vertical.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				scrollVertically((ScrollBar)event.widget);
			}
		});

		// Label to show the image size.
		sizeLabel = new Label(shell, SWT.NULL);
		sizeLabel.setText(bundle.getString("Size_initial"));
		sizeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the image depth.
		depthLabel = new Label(shell, SWT.NULL);
		depthLabel.setText(bundle.getString("Depth_initial"));
		depthLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the transparent pixel.
		transparentPixelLabel = new Label(shell, SWT.NULL);
		transparentPixelLabel.setText(bundle.getString("Transparent_pixel_initial"));
		transparentPixelLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the time to load.
		timeToLoadLabel = new Label(shell, SWT.NULL);
		timeToLoadLabel.setText(bundle.getString("Time_to_load_initial"));
		timeToLoadLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Separate the animation fields from the rest of the fields.
		separator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
		separator.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the logical screen size for animation.
		screenSizeLabel = new Label(shell, SWT.NULL);
		screenSizeLabel.setText(bundle.getString("Animation_size_initial"));
		screenSizeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the background pixel.
		backgroundPixelLabel = new Label(shell, SWT.NULL);
		backgroundPixelLabel.setText(bundle.getString("Background_pixel_initial"));
		backgroundPixelLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the image location (x, y).
		locationLabel = new Label(shell, SWT.NULL);
		locationLabel.setText(bundle.getString("Image_location_initial"));
		locationLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the image disposal method.
		disposalMethodLabel = new Label(shell, SWT.NULL);
		disposalMethodLabel.setText(bundle.getString("Disposal_initial"));
		disposalMethodLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the image delay time.
		delayTimeLabel = new Label(shell, SWT.NULL);
		delayTimeLabel.setText(bundle.getString("Delay_initial"));
		delayTimeLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show the background pixel.
		repeatCountLabel = new Label(shell, SWT.NULL);
		repeatCountLabel.setText(bundle.getString("Repeats_initial"));
		repeatCountLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Separate the animation fields from the palette.
		separator = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
		separator.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Label to show if the image has a direct or indexed palette.
		paletteLabel = new Label(shell, SWT.NULL);
		paletteLabel.setText(bundle.getString("Palette_initial"));
		paletteLabel.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

		// Canvas to show the image's palette.
		paletteCanvas = new Canvas(shell, SWT.BORDER | SWT.V_SCROLL | SWT.NO_REDRAW_RESIZE);
		paletteCanvas.setFont(fixedWidthFont);
		paletteCanvas.getVerticalBar().setVisible(true);
		gridData = new GridData();
		gridData.horizontalAlignment = GridData.FILL;
		gridData.verticalAlignment = GridData.FILL;
		GC gc = new GC(paletteLabel);
		paletteWidth = gc.stringExtent(bundle.getString("Max_length_string")).x;
		gc.dispose();
		gridData.widthHint = paletteWidth;
		gridData.heightHint = 16 * 11; // show at least 16 colors
		paletteCanvas.setLayoutData(gridData);
		paletteCanvas.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent event) {
				if (image != null)
					paintPalette(event);
			}
		});

		// Set up the palette canvas scroll bar.
		vertical = paletteCanvas.getVerticalBar();
		vertical.setVisible(true);
		vertical.setMinimum(0);
		vertical.setIncrement(10);
		vertical.setEnabled(false);
		vertical.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				scrollPalette((ScrollBar)event.widget);
			}
		});

		// Sash to see more of image or image data.
		sash = new Sash(shell, SWT.HORIZONTAL);
		gridData = new GridData();
		gridData.horizontalSpan = 2;
		gridData.horizontalAlignment = GridData.FILL;
		sash.setLayoutData(gridData);
		sash.addSelectionListener (new SelectionAdapter () {
			public void widgetSelected (SelectionEvent event) {
				if (event.detail != SWT.DRAG) {
					((GridData)paletteCanvas.getLayoutData()).heightHint = SWT.DEFAULT;
					Rectangle paletteCanvasBounds = paletteCanvas.getBounds();
					int minY = paletteCanvasBounds.y + 20;
					Rectangle dataLabelBounds = dataLabel.getBounds();
					int maxY = statusLabel.getBounds().y - dataLabelBounds.height - 20;
					if (event.y > minY && event.y < maxY) {
						Rectangle oldSash = sash.getBounds();
						sash.setBounds(event.x, event.y, event.width, event.height);
						int diff = event.y - oldSash.y;
						Rectangle bounds = imageCanvas.getBounds();
						imageCanvas.setBounds(bounds.x, bounds.y, bounds.width, bounds.height + diff);
						bounds = paletteCanvasBounds;
						paletteCanvas.setBounds(bounds.x, bounds.y, bounds.width, bounds.height + diff);
						bounds = dataLabelBounds;
						dataLabel.setBounds(bounds.x, bounds.y + diff, bounds.width, bounds.height);
						bounds = dataText.getBounds();
						dataText.setBounds(bounds.x, bounds.y + diff, bounds.width, bounds.height - diff);
						//shell.layout(true);
					}
				}
			}
		});

		// Label to show data-specific fields.
		dataLabel = new Label(shell, SWT.NULL);
		dataLabel.setText(bundle.getString("Pixel_data_initial"));
		gridData = new GridData();
		gridData.horizontalSpan = 2;
		gridData.horizontalAlignment = GridData.FILL;
		dataLabel.setLayoutData(gridData);
		
		// Text to show a dump of the data.
		dataText = new StyledText(shell, SWT.BORDER | SWT.MULTI | SWT.READ_ONLY | SWT.V_SCROLL | SWT.H_SCROLL);
		dataText.setBackground(display.getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));
		dataText.setFont(fixedWidthFont);
		gridData = new GridData();
		gridData.horizontalSpan = 2;
		gridData.horizontalAlignment = GridData.FILL;
		gridData.verticalAlignment = GridData.FILL;
		gridData.heightHint = 128;
		gridData.grabExcessVerticalSpace = true;
		dataText.setLayoutData(gridData);
		dataText.addMouseListener(new MouseAdapter() {
			public void mouseDown(MouseEvent event) {
				if (image != null && event.button == 1) {
					showColorForData();
				}
			}
		});
		dataText.addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent event) {
				if (image != null) {
					showColorForData();
				}
			}
		});
		
		// Label to show status and cursor location in image.
		statusLabel = new Label(shell, SWT.NULL);
		statusLabel.setText("");
		gridData = new GridData();
		gridData.horizontalSpan = 2;
		gridData.horizontalAlignment = GridData.FILL;
		statusLabel.setLayoutData(gridData);
	}
	
	Menu createMenuBar() {
		// Menu bar.
		Menu menuBar = new Menu(shell, SWT.BAR);
		shell.setMenuBar(menuBar);
		createFileMenu(menuBar);
		createAlphaMenu(menuBar);
		return menuBar;
	}
	
	void createFileMenu(Menu menuBar) {
		// File menu
		MenuItem item = new MenuItem(menuBar, SWT.CASCADE);
		item.setText(bundle.getString("File"));
		Menu fileMenu = new Menu(shell, SWT.DROP_DOWN);
		item.setMenu(fileMenu);

		// File -> Open File...
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("OpenFile"));
		item.setAccelerator(SWT.MOD1 + 'O');
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuOpenFile();
			}
		});
		
		// File -> Open URL...
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("OpenURL"));
		item.setAccelerator(SWT.MOD1 + 'U');
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuOpenURL();
			}
		});
		
		// File -> Reopen
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Reopen"));
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuReopen();
			}
		});
		
		new MenuItem(fileMenu, SWT.SEPARATOR);
		
		// File -> Save
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Save"));
		item.setAccelerator(SWT.MOD1 + 'S');
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuSave();
			}
		});
		
		// File -> Save As...
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Save_as"));
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuSaveAs();
			}
		});
		
		// File -> Save Mask As...
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Save_mask_as"));
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuSaveMaskAs();
			}
		});
		
		new MenuItem(fileMenu, SWT.SEPARATOR);
		
		// File -> Print
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Print"));
		item.setAccelerator(SWT.MOD1 + 'P');
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuPrint();
			}
		});
		
		new MenuItem(fileMenu, SWT.SEPARATOR);

		// File -> Exit
		item = new MenuItem(fileMenu, SWT.NULL);
		item.setText(bundle.getString("Exit"));
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				shell.close();
			}
		});
	
	}

	void createAlphaMenu(Menu menuBar) {
		// Alpha menu
		MenuItem item = new MenuItem(menuBar, SWT.CASCADE);
		item.setText(bundle.getString("Alpha"));
		Menu alphaMenu = new Menu(shell, SWT.DROP_DOWN);
		item.setMenu(alphaMenu);

		// Alpha -> K
		item = new MenuItem(alphaMenu, SWT.NULL);
		item.setText("K");
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuComposeAlpha(ALPHA_CONSTANT);
			}
		});

		// Alpha -> (K + x) % 256
		item = new MenuItem(alphaMenu, SWT.NULL);
		item.setText("(K + x) % 256");
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuComposeAlpha(ALPHA_X);
			}
		});

		// Alpha -> (K + y) % 256
		item = new MenuItem(alphaMenu, SWT.NULL);
		item.setText("(K + y) % 256");
		item.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				menuComposeAlpha(ALPHA_Y);
			}
		});
	}

	void menuComposeAlpha(int alpha_op) {
		if (image == null) return;
		animate = false; // stop any animation in progress
		Cursor waitCursor = new Cursor(display, SWT.CURSOR_WAIT);
		shell.setCursor(waitCursor);
		imageCanvas.setCursor(waitCursor);
		try {
			if (alpha_op == ALPHA_CONSTANT) {
				imageData.alpha = alpha;
			} else {
				imageData.alpha = -1;
				switch (alpha_op) {
					case ALPHA_X: 
						for (int y = 0; y < imageData.height; y++) {
						for (int x = 0; x < imageData.width; x++) {
							imageData.setAlpha(x, y, (x + alpha) % 256);
						}
						}
						break;
					case ALPHA_Y: 
						for (int y = 0; y < imageData.height; y++) {
						for (int x = 0; x < imageData.width; x++) {
							imageData.setAlpha(x, y, (y + alpha) % 256);
						}
						}
						break;
					default: break;
				}					
			}			
			displayImage(imageData);
		} finally {
			shell.setCursor(null);
			imageCanvas.setCursor(crossCursor);
			waitCursor.dispose();
		}
	}

	void menuOpenFile() {
		animate = false; // stop any animation in progress