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
