http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/DisplayananimatedGIF.htm描述了如何在SWT中显示动画GIF - 一般来说。尽管代码有效并且易于理解,但我正面临着使用该技术在SWT/JFace表格/树查看器单元格中显示动画GIF的严重问题。 - >下面的所有代码SWT表/树查看器单元格中的动画GIF
本质上,我实现了我自己的OwnerDrawLabelProvider,它在paint(Event,Object)中创建一个ImageLoader并启动一个动画线程。问题似乎是这个动画线程是而不是 UI线程,我不知道在它的run()方法中使用哪个GC或Display实例。
我试图在创建线程的构造一个单独的GC实例 - 从event.gc衍生 - 但是线程失败,只要我走出调试器的写入该GC ......
Sat Jan 9 22:11:57 192.168.1.6.local.home java[25387] : CGContextConcatCTM: invalid context 0x0 2010-01-09 22:12:18.356 java[25387:17b03] It does not make sense to draw an image when [NSGraphicsContext currentContext] is nil. This is a programming error. Break on _NSWarnForDrawingImageWithNoCurrentContext to debug. This will be logged only once. This may break in the future. Sat Jan 9 22:12:41 192.168.1.6.local.home java[25387] : CGContextConcatCTM: invalid context 0x0
如何我需要处理这种情况吗?
下面是相关的代码段:
/* Called by paint(Event, Object). */ private void paintAnimated(final Event event, final ImageLoader imageLoader) { if (imageLoader == null || ArrayUtils.isEmpty(imageLoader.data)) { return; } final Thread animateThread = new AnimationThread(event, imageLoader); animateThread.setDaemon(true); animateThread.start(); } private class AnimationThread extends Thread { private Display display; private GC gc; private ImageLoader imageLoader; private Color background; public AnimationThread(final Event event, final ImageLoader imageLoader) { super("Animation"); this.display = event.display; /* * If we were to simply reference event.gc it would be reset/empty by the time it's being used * in run(). */ this.gc = new GC(event.gc.getDevice()); this.imageLoader = imageLoader; this.background = getBackground(event.item, event.index); } @Override public void run() { /* * Create an off-screen image to draw on, and fill it with the shell background. */ final Image offScreenImage = new Image(this.display, this.imageLoader.logicalScreenWidth, this.imageLoader.logicalScreenHeight); final GC offScreenImageGC = new GC(offScreenImage); offScreenImageGC.setBackground(this.background); offScreenImageGC.fillRectangle(0, 0, this.imageLoader.logicalScreenWidth, this.imageLoader.logicalScreenHeight); Image image = null; try { /* Create the first image and draw it on the off-screen image. */ int imageDataIndex = 0; ImageData imageData = this.imageLoader.data[imageDataIndex]; image = new Image(this.display, imageData); offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height, imageData.x, imageData.y, imageData.width, imageData.height); /* * Now loop through the images, creating and drawing each one on the off-screen image before * drawing it on the shell. */ int repeatCount = this.imageLoader.repeatCount; while (this.imageLoader.repeatCount == 0 || repeatCount > 0) { switch (imageData.disposalMethod) { case SWT.DM_FILL_BACKGROUND: /* Fill with the background color before drawing. */ offScreenImageGC.setBackground(this.background); offScreenImageGC.fillRectangle(imageData.x, imageData.y, imageData.width, imageData.height); break; case SWT.DM_FILL_PREVIOUS: // Restore the previous image before drawing. offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height, imageData.x, imageData.y, imageData.width, imageData.height); break; } imageDataIndex = (imageDataIndex + 1) % this.imageLoader.data.length; imageData = this.imageLoader.data[imageDataIndex]; image.dispose(); image = new Image(this.display, imageData); offScreenImageGC.drawImage(image, 0, 0, imageData.width, imageData.height, imageData.x, imageData.y, imageData.width, imageData.height); // Draw the off-screen image. this.gc.drawImage(offScreenImage, 0, 0); /* * Sleeps for the specified delay time (adding commonly-used slow-down fudge factors). */ try { int ms = imageData.delayTime * 10; if (ms
我张贴同样的问题在SWT新闻组http://www.eclipse.org/forums/index.php?t=tree&th=160398
感谢您的指针,我会看看它。 为了清楚起见,您建议实施“常规”标签提供程序(即,不是OwnerDraw)在适当的时候返回静态图像 - 在具有静态图像的行上 - 并且为具有动画图像的所有行单独调用viewer.update(...)。 – 2010-01-11 20:59:18
Hhhmmm,这很好,但我仍然需要找到正确的显示和GC实例来绘制... – 2010-01-11 21:17:41
您可以从控件中获取显示。 GC gc =新的GC(myTable.getDisplay())。 – 2010-01-12 06:53:56