A site can use javascript to scroll, like window.scrollBy() etc... also the user can click on an anchor link <a href="#hest">.
Cheers Kenneth On Mon, Jan 10, 2011 at 5:51 PM, Harri Pasanen <[email protected]> wrote: > Saturday, January 08, 2011 05:35 pm > Kenneth Rohde Christiansen writes: >> Let me repost as I was subscribed with another address: >> >> Hi there, >> >> To get the right result you will need to scale the contents and not >> zoom it, as zooming is not the same as just applying a scale. Scaling >> the QPainter would do. On the other hand, you cannot ensure a really >> smooth pinch animation as you repaint the whole time without being >> able to ensure how long that repaint will take. What you really should >> do is to use the QGraphicsWebView as it supports a tiled backing >> store. Then you can pinch the following way: >> >> 1) freeze the backing store >> 2) apply a scale to the QGraphicsWebView (this will scale the frozen >> tiles (pixmaps)) >> 3) unfreeze the backing store (it will now repaint and become crisp) >> >> It would be nice if you could add such support to our demo/test >> browser QtTestBrowser found in our webkit repository. >> >> Just to make it clear, with the QGraphicsWebView you do not need to >> change the QPainter directly. A QGraphicsWebView is a QGraphicsWidget >> and it has a ::setScale() method, which you can use. >> >> I forgot to mention one more thing: >> >> 1) You need to enable resizesToContents if you are going to scale the >> QGraphicsWebView, which means that you need to implement your own >> panning as well. ie have a QGraphicsItem serve as a view to your >> QGraphicsWebView. Every time, the viewport is (re)sized, or a >> pinch/panning animation has ended, you will need to call >> setActualVisibleContentsRect(). Do not do this during animations for >> performance reasons. >> >> QtTestBrowser shows how to use resizesToContents with tiling etc, but >> it still lacks the setActualVisibleContentsRect() code, which is >> needed: >> >> 1) for not ending up in infinit tiling creation (it needs an initial >> size; the (re)sizing) >> 2) for programmatic scrolling to work, anchor links (it needs the new >> visible rect after each pinch, panning ended) >> > > I'm not quite sure what you mean with "for programmatic scrolling to work, > anchor links"... > > What do you mean by "anchor links" > > Anyway, thanks for the advice. If I have the time I'll delve into this a bit > deeper, no promises yet... If I get it to work I'm happy to contribute it to > QtTestBrowser. > > Harri > _______________________________________________ > webkit-qt mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-qt > -- Kenneth Rohde Christiansen Senior Engineer Application and Service Frameworks, Nokia Danmark A/S Phone +45 4093 0598 / E-mail kenneth.christiansen at gmail.com http://codeposts.blogspot.com ﹆﹆﹆ _______________________________________________ webkit-qt mailing list [email protected] http://lists.webkit.org/mailman/listinfo.cgi/webkit-qt
