I've created a website that displays a numbers of images and draws them on
a canvas. Those images are PreloadedImage instances, and fire the draw
method on their load event. This works fine in Chrome but in Internet
Explorer their width are 0 when asked for (in Chrome, their width is
correct) using PreloadedImage.getWidth(), or getOffsetWidth(), or via
getElement().getStyle().getWidth()...
When inspecting the instance of the PreloadedImage in Eclipse, i can see
that the element does have the correct width and height, but when it's
requested by GWT, the result is zero, resulting in incorrect drawing.
Any ideas?
- edit 1: tried it by waiting for the load to finish using a Timer:
I did a quick try to wait for the image to render but it seems not to be
loading at all:
currentImage = new PreloadedImage();
currentImage.addLoadHandler(new LoadHandler() {
@Override
public void onLoad(LoadEvent event) {
Timer timer = new Timer() {
@Override
public void run() {
System.out.println("timer check: width: " +currentImage.getWidth());
if(currentImage.getWidth()>0) {
//draw the image
this.cancel();
}
}
};
timer.scheduleRepeating(100);
}
});
- edit 2: some more information:
When the image is loaded, before drawing, I request its dimensions. When
inspecting currentImage (instance of PreloadedImage), the toString method
returns the following:
<img aria-hidden="true"
style="display: none; visibility: hidden;"
class="PRELOADEDIMAGE"
src="/imageservlet?filename=1368280253128&height=1000" width="1505"
height="1000">
Note that width and height are set correctly. However, when requesting the
following:
currentImage.getWidth()
currentImage.getOffsetWidth()
String heightattr = e.getAttribute("height");
I get consistently zero results. I suspected the encoding of the ampersand
to be a problem, but Internet Explorer deals with it the same way as Chrome
does (in the end, the same url is used to fetch the image, and it is
correct).
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