Hi all. A few months back, http://trac.webkit.org/changeset/64272 added Document::nodesFromRect as a convenient interface for the rect-based hit testing extension (also added in the same checkin). The intention behind this checkin is to enable WebKit to enlarge the target area of mouse events, by building up a fuzzy rectangular area to be processed by the engine while hit testing, which can be specially useful for touch devices.
As is today, the method signature looks like this: void nodesFromRect(int x, int y, int horizontalPadding, int verticalPadding). Basically, the rectangular area to be processed by the engine is built up using the original event position as its center point (x and y), expanding it by the given paddings for each orientation (vertical and horizontal). Empirical results from testing the use of nodesFromRect in capacitive touch screens showed us that users tend to tap below elements. So for even more accurate results (which means pleasant tapping experience), it makes sense to use a region that is offset more above the touch point, favoring elements above the touch point. The Mozilla mobile team also had the same feeling (as described in [1]) and adjusted their nodesFromRect API accordingly by making it possible to specify different offset for each direction (top, right, bottom, left). I propose we to follow their more flexible approach: method signature would change to RefPtr<NodeList> nodesFromRect(int x, int y, int top, int right, int bottom, int left). Whoever still want to share the same value for vertical offsets will be happy, and who want it more flexible will also be happy. Filed bug https://bugs.webkit.org/show_bug.cgi?id=46336 about that. [1] http://starkravingfinkle.org/blog/2010/05/smart-tapping-in-mobile-firefox/ [2] http://mxr.mozilla.org/mozilla-central/source/dom/interfaces/base/nsIDOMWindowUtils.idl#416 -- --Antonio Gomes _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
