我想显示类似于java2s.com“创建惰性文件树”的文件树,但要包括实际的系统图标- 特别是对于文件夹。SWT似乎不提供此功能(Program API不支持文件夹),因此我提出了以下建议:
public Image getImage(File file) { ImageIcon systemIcon = (ImageIcon) FileSystemView.getFileSystemView().getSystemIcon(file); java.awt.Image image = systemIcon.getImage(); int width = image.getWidth(null); int height = image.getHeight(null); BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2d = bufferedImage.createGraphics(); g2d.drawImage(image, 0, 0, null); g2d.dispose(); int[] data = ((DataBufferInt) bufferedImage.getData().getDataBuffer()).getData(); ImageData imageData = new ImageData(width, height, 24, new PaletteData(0xFF0000, 0x00FF00, 0x0000FF)); imageData.setPixels(0, 0, data.length, data, 0); Image swtImage = new Image(this.display, imageData); return swtImage; }
但是,应该透明的区域以黑色显示。我该如何工作,还是应该采用其他方法?
更新:
我认为原因完全PaletteData不是为了透明。
PaletteData
现在,我填补BufferedImage与Color.WHITE现在,这是一个可接受的解决方法。不过,我想在这里知道真正的解决方案…
BufferedImage
Color.WHITE
co](http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet156.java?view=co):
static ImageData convertToSWT(BufferedImage bufferedImage) { if (bufferedImage.getColorModel() instanceof DirectColorModel) { DirectColorModel colorModel = (DirectColorModel)bufferedImage.getColorModel(); PaletteData palette = new PaletteData(colorModel.getRedMask(), colorModel.getGreenMask(), colorModel.getBlueMask()); ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette); for (int y = 0; y < data.height; y++) { for (int x = 0; x < data.width; x++) { int rgb = bufferedImage.getRGB(x, y); int pixel = palette.getPixel(new RGB((rgb >> 16) & 0xFF, (rgb >> 8) & 0xFF, rgb & 0xFF)); data.setPixel(x, y, pixel); if (colorModel.hasAlpha()) { data.setAlpha(x, y, (rgb >> 24) & 0xFF); } } } return data; } else if (bufferedImage.getColorModel() instanceof IndexColorModel) { IndexColorModel colorModel = (IndexColorModel)bufferedImage.getColorModel(); int size = colorModel.getMapSize(); byte[] reds = new byte[size]; byte[] greens = new byte[size]; byte[] blues = new byte[size]; colorModel.getReds(reds); colorModel.getGreens(greens); colorModel.getBlues(blues); RGB[] rgbs = new RGB[size]; for (int i = 0; i < rgbs.length; i++) { rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF); } PaletteData palette = new PaletteData(rgbs); ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette); data.transparentPixel = colorModel.getTransparentPixel(); WritableRaster raster = bufferedImage.getRaster(); int[] pixelArray = new int[1]; for (int y = 0; y < data.height; y++) { for (int x = 0; x < data.width; x++) { raster.getPixel(x, y, pixelArray); data.setPixel(x, y, pixelArray[0]); } } return data; } return null; }
然后您可以这样称呼它:
static Image getImage(File file) { ImageIcon systemIcon = (ImageIcon) FileSystemView.getFileSystemView().getSystemIcon(file); java.awt.Image image = systemIcon.getImage(); if (image instanceof BufferedImage) { return new Image(display, convertToSWT((BufferedImage)image)); } int width = image.getWidth(null); int height = image.getHeight(null); BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = bufferedImage.createGraphics(); g2d.drawImage(image, 0, 0, null); g2d.dispose(); return new Image(display, convertToSWT(bufferedImage)); }