There's really no way to get around it. A 1 megapixel image is fairly large. The way I worked around this is to create smaller proxy images that gets used (ie. 640 pixels wide or 320 pixels wide, depending on how large the image is displayed). This image must be resized and served from the server. For me, when the image needs to be enlarged, I will then specifically replace the selected image with a larger version dynamically. When it's deselected, I replace it with the proxy image again. Thus, at any given time, there is only one high resolution image.
The idea is fairly similar to how 3D environments are rendered. Maps that are more front gets rendered in more details while maps that are in the background gets rendered with less. In this particular case, size really does matter. CK On Feb 13, 2009, at 10:50 AM, Rhyce wrote: > > UPDATE: > > So, after hours of trying different things I found that this > "slowness" bug is caused when the images are set to sizes that are not > native. For example, say you have a 1000x1000 image, but set the size > to 100x100 (letting the browser to the scaling) --- THEN the scroll is > slow. Now, this may or may not be related to GWT directly, but I'd > still appreciate any advice. Is this something others have observed? > Any way to get around it? > > Best, > > J > > > On Feb 13, 12:35 am, Rhyce <jsing...@gmail.com> wrote: >> Hi All, >> >> I've been experiencing an issue that I can't seem to nail down: Slow >> Scrolling in GWT. >> >> My setup is this: >> >> A TabPanel with a DockPanel in it. In the dock panel there are about, >> say anywhere from 10-300 images that are about 1000x1000. In Safari >> (I'm on a Mac) I can scroll through that setup with blazing speed. >> However, when I load them into a scrollpane in GWT, the scrolling is >> jerky and not very smooth at all. >> >> There are a number of events (of course) hooked up to the various >> scroll events, but even stripping it down to a simple ScrollPanel >> inside the Tab/DockPanel with no events listening doesn't seem to >> help >> much at all. >> >> Is there anything else I can check to perhaps improve the performance >> in this critical area? I don't understand how scrolling can be >> intensive enough that it doesn't work in GWT if all of the things it >> implements are basically HTML widgets. >> >> Anyone? >> >> Best, >> >> J > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to Google-Web-Toolkit@googlegroups.com To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
